The Three Models Of Memory Essay Example for Free

The Three Models Of Memory Essay Memory- Task 1 Evaluate the usefulness of the three models of memory (multi-store model, working memory model and the levels of processing model) and discuss practical implications of memory research. Atkinson and Shiffrins Multi- store Model of Memory (1968) hypothesises that there are three stores for memory; Sensory memory, short term memory (STM) and long term memory (LTM). The theory states that a memory passes through each of the stores and that the importance of the memory determines which store the memory is kept in and thus how long it is retained. This relatively simple model is supported by evidence from free recall experiments and from studies performed on patients with brain damage such as HM. An example of a free recall experiment is Murdock (1962) in which participants were shown lists, of differing lengths, of words for a period of one second, they were then asked to recall as many words as possible. Murdock found that the words at the beginning, primary effect, and end, recency effect, were recalled more accurately than those in the middle. This is known as the serial position effect and proves that there are two separate stores from which the memories were recalled, which supports the multi-store memory models short and long memory stores. Studies on brain damaged patients like HM (Milner et al, 1978), who began to suffer from anterograde amnesia after both of his hippocampi were removed in an operation, also support the working memory models theory that STM and LTM are separate stores. HM was able to recall memories from eleven years before the operation yet wasnt able to remember who was president of the United States and forgot who he was talking to as soon as he turned away (Jenni Ogden, PhD, 2012). It is argued however that the multi-store memory model oversimplifies the roles of the STM and LTM. Atkinson and Shiffren also failed to acknowledge the interaction between stores something which Baddeley and Hitch (1974) dealt with in their Working Memory Model. The idea that simple rehearsal accounts for the transfer of a memory from the STM to the LTM was also criticised as this doesnt take into account important events for example a car accident. Events such as this seem to immediately be stored in LTM again this is dealt with by another memory model, Craik and Lockheart (1972) Levels of Processing. The working memory model also fails to recognise memory improvement techniques, for example the method of loci which uses points on an imaginary journey as a  way of memorising particular items. Despite accurately theorising that the LTM and STM are separate stores the multi-store memory model fails to account for many instances in which the flow of memory doesnt follow the three store route and although accurate at the time, research has, over time, out dated it. In contrast Baddeley and Hitchs (1974) Working Memory Model states that a Central Executive allocates resources and decides how attention is directed, although it doesnt have any capacity it does hold memory long enough to direct attention. An Episodic Buffer then integrates the information and is used as a general storage space for acoustic and visual tips. The Phonological Loop holds and rehearses words and the Audio-Visual Sketchpad allows temporary holding of visual images. The intuitive Working Memory Model is far more complex than either the Multi-Store Model or the Levels of Processing and is high in face validity. The validity of each section of the Working Memory Model is supported through various differen t experiments such as Baddeley and Lewis’s (1981) study into the importance of the articulatory loop. By asking participants whether or not a sentence was meaningful, for example, â€Å"the cow ate the grass† or the â€Å"bone ate the dog†, under both normal conditions and when repeating something meaningless to stop them from using their articulatory loop. Doing this seriously reduced recall in the latter results. This, Baddeley and Lewis claimed, supported their theory of a presence of an articulatory loop. In a study by Baddeley et al (1975) the phonological loop was shown to be capable of holding two seconds of information. Baddeley et al (1975) asked participants to recall five words in correct order. What the experiment demonstrated was that it was the length of the word and not the discreetness that determined recall. However further studies have gone on to suggest that a determining factor is the time it takes to pronounce a word as opposed to its alphab etical length. James W. Stigler (1986) found in a study on digit memory in Chinese and English that children, used because they were less likely to have knowledge of memory improvement techniques, from China were more efficient at remembering numbers than their English speaking counterparts. This, Stigler theorises, is due to Chinese numbers being shorter to pronounce. The visuospatial scratchpad, referred to sometimes as the inner eye is what allows someone to remember shapes such as letters and visualise something that isnt there, for example, whether or  not your car would fit into a particular parking space. It can also allow us to hold static images and manipulate them, thus we are able to appreciate a layout of a particular area and find our way around (Psychology Resources, 2000). Logie (1995) argues that the visuo-spatial scratchpad is in fact far more complex and refers to it as the Visuo-spatial Working memory. This is supported by Baddeley and Lieberman (1980) whose pat tern of results suggest that visuo-spatial working memory did indeed comprise a system that was involved in visuo-spatial retention, in visuo-spatial perception, and in motor control. The Working Memory Model is high in face validity and despite being far more complex than either the Multi- Store Model or Levels of Processing Model is reinforced by various experiments. These experiments clearly present the different sections the Working Memory Model. It also takes into account things the other models do not, for example, the Working Memory Model allows for memory to pass directly into LTM without rehearsal, something Multi-Store and Levels of Processing do not, events that are traumatic or massively significant do not require rehearsal and this is something the Working Model addresses. As well as this Baddeley and Lewiss model is highly applicable to real world situations, for example, Baddeley et al (1975) showed the word length effect, a real world counterpart would be attempting to remember a shopping list. The only criticism of The Working Memory Model is the lack of information in regards to the Central Executive, however further investigation is required to discover what its capacity actually is. It is theorised that many accidents are caused by its limited capacity and that information on its exact capacity may have serious implication for accident control (Psychology Resources, 2000). Craik and Lockharts (1975) Levels of Processing Model focuses on the processes involved in memory instead of the stores/ structures (McLeod, 2007). Craik and Lockhart (1975) took a non-structured approach to the memory model, this was as a result of the criticism garnered by Atkinson and Shiffrens earlier Working Memory Model. The chief idea behind the Levels of Processing Model is that memory is a result of processing information and that length of memory is determined by the importance of the information, something referred to as depth of processing. Craik defined depth as the meaningfulness extracted from the  stimulus rather than in terms of the number of analyses performed upon it.† Orthographic processing is the simplest way in which we process information and thus, according to the model, the one which retains the least memory, it is also referred to as shallow processing. This when we consider the physical features of, for example, a word. Craik and Tulvig (1975) demonstrated this by asking is this word in capital letters? this requires you to only process the word physically. Similarly to the Multi-Store Model maintenance rehearsal is also required in order to retain memories the Levels of Processing Model deems shallow. Medium processing or phonological processing as its sometimes called is the second level of processing. This Craik and Lockhart hypothesise takes into account the acoustic value of a word, this they argue is deeper processing than orthographic because it requires you to process a sound instead of an image. Craik and Tulvig (1975) again demonstrated this by asking does this word rhyme with ? this activates your phonological processing as you have to process the word acoustically (Psychology Resource, 2000). The deepest level of processing is what Craik and Lockhart describe as semantic processing. Semantic processing is described by Robert Gallo as allowing subjects to encode more unique features from each word relative to surface processing . . . additional conceptual or semantic features help to differentiate the studied items from each other, making these memories less susceptible to interference . . . â€Å". Semantic processing requires the use of meaning to process a word, Craig and Tulvig (1975) asked would this word fit into a sentence? Jane bought some for dinner in answering the question you would have to process the meaning. The basis of the model is quite simple, the more you process the memory, the more likely you are to remember it. However the model fails to explain why this is the case, meaning the model is descriptive rather than explanatory. The model was the first to suggest that process used have an effect on memory and has had implications on memory improvement techniques, for example, the Method of Loci is the process of placing things at various  points of a journey in order to make them more memorable, this is semantic processing. What there isnt is a way in which processing can be measured, Baddeley (1978) points out that well remembered events are attributed as deeply processed however because of this the argument that deep processing equals better recall is circular and thus cannot be tested (Psychology Resource, 2000). Memory research is crucial in many areas and none more so than in Eyewitness testimony. This is a legal term that is often used, and respected in a court of law. A jury can find eyewitness testimony a reliable source of information however research into memory has shown that it may not be as reliable as previously thought. Elizabeth Loftus theorises that memory under any circumstances is subject to inaccuracy and that there are many wrongful convictions every year as a result of faulty eyewitness testimony. Loftus et al. (1987) showed subjects of slides of a customer in a restaurant. In one version the customer was holding a gun, in the other the same person held a chequebook. Those who saw the gun version tended to focus on the gun. Thus they were less likely to identify the customer in a line-up as those who had seen the chequebook version. Clifford and Scott (1978) also supports Loftuss theory. They found after showing participants a film of a violent attack that recall was less t han a control group who saw something less stressful and were able to recall 40 items of information. However this gun focus theory has been challenged by Yuille and Cutshall (1986) who found that witnesses to a real shooting in Canada had remarkable accurate memories of the event. This contradicts both Loftus et al (1987) and Clifford and Scott (1978). This leads us to believe that memory recall in stressful situations can be subject to very different levels of interpretation. Where Loftus et al (1987) shows us clearly that people focus on, potentially the most shocking item. Yuille and Cutshall (1986) challenge that by using a real event to show some may be able to recall accurately. However this only goes to highlight the radical differences seen in eyewitness testimony. References: Jenni Ogden, Ph.D. (2012). HM, the Man with No Memory.

Vs of Big Data

Vs of Big Data Big data based on the word itself means data which is big but how much big is considered as big? For a small business, big data might be few gig while Facebook processes 100s of Tb data every day [6]. So, the definition of big data will slightly differ from organization to organization. Few years back big data meant the huge size of data which is beyond the ability of normal software to process and handle it. Big data was defined using the 3 Vs : Volume, Velocity and Variety but now that has changed and now four more Vs were added which consists of [1] : Variability: This means the data does not have same meaning every day and is constantly changing Veracity: Making sure the data we have is accurate Visualization: Visualizing the data so it can be easily interpreted by readers Value: The final goal is to get some value out of data University of California, Berkley asked forty thought leaders in data science field about the definition of Big Data. John Akred the founder and CTO of Silicon Valley Data Science described big data as, Big Data refers to a combination of an approach to informing decision making with analytical insight derived from data, and a set of enabling technologies that enable that insight to be economically derived from at times very large, diverse sources of data [5].While David Leonhardt who is an editor for The New York Times defines big data as, Big Data is nothing more than a tool for capturing reality just as newspaper reporting, photography and long-form journalism are [5].ÂÂ   As we can see different people from different industry has different definition of Big Data but one thing in common is that it follows the basic three Vs defined before and the end product is different. Microsoft defines big data as patterns which can be used with proven practices for predictable results. Further they defined big data as Data often produced at fire hose rate, that you do not know how to analyze at the moment but may provide valuable information in future [4]. Then they ask the readers if they know what the visitors to their website are really thinking? Or if they are business owners and if they know what the customers think of their products? They ask these questions and then tell them that the answer is hidden in the pile of data which is hidden away and if you can find it still it might be difficult to process it and get meaningful insights out of it. Microsoft then further defines big data as Big data typically refers to collections of datasets that, due to size and complexity, are difficult to store, query, and manage using existing data management tools or data processing applications. We notice here that they are trying to focus on the difficulty of storing, querying and managing data and can expect a solution or product for it. So basically, Microsoft is trying to connect with their readers by asking them if they have a big data problem and then providing an example of what techniques data analysts and business managers are following and how Microsoft can help them. Then they describe Big Data with the text book definition using the three Vs and links the readers to their product called HDInsight [4]. HDInsight is a Hadoop- based solution which Microsoft offers. It is an all in one solution which can store data, process data and executing data analysis. Tableau is one of the biggest company and provider of visualization techniques which can help companies visualize data from any source. They define big data as structured or unstructured, petabytes or terabytes, millions or billions of rows, you can turn data into big ideas[1]. They try to focus on the visualization part as Tableau is used discover and understand their data. So, if we compare it to Microsoft definition they are missing the part about storing the data, retrieving it and the problems behinds it.ÂÂ   While explaining the meaning of big data tableau keeps pointing out the importance of visualizing the data regardless of the size of data and how organizations can leverage this to their benefit. They also iterate that storing, preparing and iterating data is costly and Tableaus vision is to help companies apply best practices to get the most out of their data. SAS uses the three Vs of big data (Volume, Velocity and Variety) to define it and say its not the amount of data that is important but what to do with it and how to use it to make better decisions. SAS adds two more dimensions Variability and Complexity to its definition of big data. They define variability as inconsistency in the amount of data that flows which cannot be controlled [3]. Complexity is defined as different types of data coming from different sources and connecting and combining it to get meaningful insights out of it. When we compare, the definitions provided by these companies it is obvious the core definition of big data remains the same but then these companies tailor tit according to the products they offer. Microsoft which provides end to end solution for big data talks about storing of data which is skipped by Tableau as it provides solution for visualizing the data and not storing. So, we can conclude that there is no authority on the exact meaning of Big Data and its solutions. Works Cited [1] Understanding Big Data: The Seven Vs. Dataconomy. July 23, 2014. Accessed January 30, 2017. http://dataconomy.com/2014/05/seven-vs-big-data/. [2] Big Data. Tableau Software. Accessed January 30, 2017. https://www.tableau.com/stories/topic/big-data. [3] What is Big Data and why it matters. What Is Big Data? | SAS US. Accessed January 30, 2017. http://www.sas.com/en_us/insights/big-data/what-is-big-data.html. [4] What is big data? Accessed January 30, 2017. https://msdn.microsoft.com/en-us/library/dn749868.aspx. [5] What Is Big Data? What Is Big Data? Blog. September 03, 2014. Accessed January 30, 2017. https://datascience.berkeley.edu/what-is-big-data/. [6] Data size estimates. Follow the Data. June 24, 2014. Accessed January 30, 2017. https://followthedata.wordpress.com/2014/06/24/data-size-estimates/.

Three-Dimensional Grade Control in Road Construction

Three-Dimensional Grade Control in Road Construction Three-Dimensional Grade Control in Road Construction using Unmanned Aerial Vehicle Introduction Contractors have used grade stakes installed on the side of the road at intervals of 100 feet for the vertical grade of the finished ground surface in road construction. The grade stakes are measured based on control points(CPs) which are reference points and markers established by surveyors at the design phase. By using the grade stakes, the contractors align the grade elevation with regulated tolerances which are typically less than 0.05 feet for subgrade and 0.02 feet for roadway surface (Missouri Highways and Transportation Commission 2016). The contractors confirm the final construction layout including as-built cross sections, which are measured by a total station or conventional survey methods such as a level, theodolite, and transit at intervals of 500 feet. The final products should be in reasonably close conformity with the design plans and specifications (Floyd et al. 2013). Figure 1: The conventional grade control using grade stakes (Missouri Highways and Transportation Commission 2016) However, in many cases, the contractors have experienced unsuspected discrepancies between the as-designed model and the as-built model, which cause the project cost and time overrun (Pitman 2001). These discordances could be derived from technical issues or human matters that are issues among people such as a lack of coordination and communication between designers and contractors (Arain et al. 2004). While the problems caused by human issues could be solved easily by involving the contractors and designers as coordinators, the resolving the technical problems, such as a measurement error, still remain challenges because the conventional grade control methods use only a few points to build a final grade layout, which can cause considerable errors at the non-measured area. For this reason, many researchers have studied on the application of new technologies such as a global positioning system (GPS), robotic total station (RTS), and terrestrial laser scanning (TLS) to obtain dense poi nts for the grade control. Despite all these efforts, the contractors are still using the traditional methods for grade control because of the disadvantages of the new approaches regarding the economic and usability. In this regard, unmanned aerial vehicle (UAV) is the most reasonable way to overcome such shortcomings (Nex and Remondino 2014). The photogrammetry using UAV is a time-competitive method to generate a digital surface model (DSM) which enables contractors to obtain the dense point cloud of the long-strip roadway construction site without intervals (Chiabrando et al. 2009). Moreover, the UAV allows the user to avoid working in hazardous environments (Barry and Coakley 2013). With such advantages, several researchers apply the UAV to roadway construction, especially for surveying earthwork projects (Siebert and Teizer 2014). The current accuracy of the UAV photogrammetry, however, does not completely meet the particular requirements in road construction such as the grading tolerance which is less than 0.05 feet. This study, therefore, reviews the current state of the three-dimensional grade control in road construction and presents a best practice for applying the UAV for the construction by providing a way to develop the accuracy of the UAV photogrammetry. Moreover, this study verifies the improved accuracy through the field test at an ongoing highway construction site in Georgia, the United States. Literature Review This study has reviewed current studies on the 1) grade control methods in road construction using dense point clouds, 2) applications of UAV for highway construction, and 3) accuracy of UAV photogrammetry. Current study on the grade control in roadway construction As mentioned above, the contractors today perform the grade control in a conventional manner using grade stakes and cross sections because those methods dont require a specialty. However, such methods are conducted sparsely at regular but widely spaced intervals, which can give rise to substantial errors when the contractors build a successive three-dimensional as-built model. To avoid this, many researchers have studied on the way to create a 3D as-built model without intervals as below. 3D grade control using GPS installed on the construction equipment The real-time kinematic (RTK) GPS technology provides a location information for a dynamic motion in real time. The advent of the RTK-GPS technology enables the users to control the machines blade systemically and to build 3D as-built model automatically (Stewart, 2006). For this reason, many global GPS manufacturers, such as Topcon, Trimble, and Leica, present automatic 3D grade control technologies as seen in Figure 2. According to a final report on Implementation of GPS Controlled Highway Construction Equipment in the University of Wisconsin, the use of the GPS to guide construction equipment is time-efficient and cuts costs (Vonderohe 2007). Figure 2: GPS controlled roadway construction equipment Accordingly, many Department of Transportation (DOT) have increased the implementation of the automated machine guidance with GPS (Townes 2013). However, the vertical error of RTK-GPS is typically over 1.5 inches, and sometimes a sudden elevation shift caused by a cycle slip or multipath, which can lead to a significant discrepancy between as-design model and as-built model. Therefore, its impossible to fully adopt the GPS to grade control in roadway construction unless there is an enhancement of the accuracy. Terrestrial laser scanning (TLS) for the highway construction process monitoring The TLS, which measures the location of thousands of points each epoch at ranges of hundreds of meters, is another method to collect high dense point data. The TLS generates more accurate 3D layouts than conventional survey methods (Slattery and Slattery 2013). D. Slattery et al. (2010) demonstrate that the TLS is a feasible means to control the grade in highway construction projects and to calculate earthwork quantities (Slattery and Slattery 2010). Despite the fact that the TLS guarantees accurate point clouds, this new technology faces several operational challenges. One of the primary challenges is that it takes extremely long time to acquire the dense points. In general, the measurement using TLS takes one hour to measure the area of 20,000 square feet. Furthermore, as the scanner is installed on the ground, TLS method forms shadow zones where cannot scan due to obstacles such as trees and hills. In particular, since the roadway construction site is quite long, such drawbacks co uld be fatal. In this regard, the UAV, which is a less time-consuming way of measuring fields, could be an effective alternative. Application of UAV for roadway construction The UAV referred to as a drone, has recently begun to be applied to the construction field with the improvement of the positioning technologies and high-performance digital camera (Turner et al. 2012). With the development of the high-performance UAV, many researchers have successfully applied the UAV for the 3D modeling of the construction site and the measurement of earthwork quantities. S. Siebert and J. Teizer (2014) presents a practice for the application of UAV to construction survey for earthmoving of the construction site. They assert that the UAV technology is a cost- and time-effective alternatives to ground-based survey applications (Siebert and Teizer 2014). Furthermore, M. Daakir et al. (2015) describe that the UAV equipped with GPS receiver can achieve a consistent 3D model with a relatively low cost (Daakir et al. 2015). The studies on the application of the UAV has been limited to the particular construction fields such as earthmoving project and field survey for plan ning the road construction because the accuracy of the photogrammetry using UAV is over two inches which exceed the tolerance for the vertical grade. Thus, the improvement of the accuracy of UAV photogrammetry is required prior to applying the UAV technology to the grade control in roadway construction. Figure 3: The developed UAV systems, S. Siebert and J. Teizer (left), M. Daakir et al. (right) Accuracy of UAV photogrammetry Several researchers have examined innovative ways of improving the accuracy of the UAV photogrammetry. The accuracy of the UAV photogrammetry directly depends on the ground sampling distance (GSD), which is determined by the focal length, flight altitude, and resolution of the camera. In general, higher GSD value indicates that the image would have a lower spatial resolution. Therefore, the altitude of the flight should be performed around 150 m above ground level to obtain images at the GSD of up to 10 cm. (RuzgienÄ- et al. 2015). In addition, the use of geo-referencing methods aligning UAV imagery with known points measured in advance also can improve the accuracy of the photogrammetry. J. Goncalves and R. Henriques (2015) assert that the vertical root mean square (RMS) errors of UAV photogrammetry can be decreased to 5cm by using ground control points (GCPs) as the geo-referencing (Gonà §alves and Henriques 2015). However, a minimum of three GCPs are required for the geo-refe rencing, and generally, more than nine GCPs should be appeared on the imagery to retain redundancy for least squares regression. Moreover, the method that aligns the imagery known as Image registration causes a systematic error which is a cumulative error. In particular, since the road construction site requires extremely long longitudinal measurement, the registration error is theoretically increased in direct proportion to the length of the construction site (Zheng et al. 2016). This study, therefore, proposed a method to correct the systemic error by originating the position of the flying UAV with dual-frequency RTK-GPS and resection method. Figure 4: The GCPs that J. Goncalves and R. Henriques (2015) used Methodology This chapter enumerates the methodology for applying the UAV photogrammetry to the grade control in road construction as follows. Type of UAVs Ground Sampling Distance (GSD) Ground Control Points (GCPs) Positioning of the UAV using space resection method 3D model generation Verification Types of UAV The type of UAVs is classified into three categories: fixed wing type, rotary wing type, and hybrid wing type integrated the fixed wing and rotary type. Fixed wing UAVs have characteristics that they have a simple mechanism and more efficient aerodynamics which allows the fixed wing UAV to fly longer duration at higher speeds than the rotary wing. On the contrary, the rotary wing UAVs have a relatively more complicated structure which may infer that they have lower speed and shorter flight range than fixed wing. The advantages of the rotary wing are that they can conduct vertical takeoff and landing (VTOL) and hovering. The fixed/rotary hybrid UAV has both characteristics of the fixed wing type and rotary wing type. The hybrid UAVs can perform VTOL and hovering and fly with little power like the fixed wing UAV. Table 1 shows the differences between the fixed wing and rotary drones. Since the roadway construction site is quite long and doesnt have vertical obstacles, the fixed wing ty pe of UAV is most appropriate for the surveying the road construction area. Most UAV for the land survey is equipped with single frequency GPS receiver for positioning of the flying vehicle. In general, the vertical accuracy of the single frequency GPS is compromised. For this reason, this study suggests mounting a dual frequency GPS on the UAV to improve their positioning accuracy. The vertical accuracy of the dual frequency RTK-GPS is known to be lower than 2cm in general circumstances. This study might use virtual reference station (VRS), which facilitate the RTK/GPS based on National Continuously Operating Reference Station (CORS). Table 1 The differences between fixed wing type and rotary type Fixed wing Rotary wing Purpose Mapping Small area Mapping Inspection Application Land surveying (rural) GIS Construction Inspection Real estate Surveying (urban) Flight Speed High Low Coverage Large Small Flight Duration Times Long Short Wind Resistance High Low VTOL X O Hovering X O Ground Sampling Distance (GSD) As mentioned above, GSD value is related to the flight level, focal length, and resolution of the camera. Since the GSD value directly affects the results of the photogrammetry, it is important to determine the flight altitude. For a given flying height H, the GSD will be given by Where f is the lens focal length, and H is the flight altitude. Typically, in the case of the GSD of 5 cm, the standard deviation of 1 pixel in the parallax may result in a standard deviation of approximately 5 ~ 10 cm in the elevation error. The flight altitude also affects the overlapping rate which is related to the accuracy of the photogrammetry. That is to say, for a given focal length and resolution of the camera, increasing the altitude will increase overlap rate and GSD. Since it is possible to fly the UAV at low altitude in roadway construction site where is a barrier-free area, this study limits the flight height to 100 m or less to maintain the GSD of under 5cm. Although flying at low altitude can cause little overlap rate, the matter of overlapping can be solved by taking more pictures. Ground Control Points (GCPs) In the photogrammetry for field surveying, establishing a network of the ground control points The GCPs installed on the field is employed for the geo-referencing. Although the bundle image adjustment needs to have at least three GCPs, it is necessary to have 9 or more GCPs for providing enough redundancies for the least square adjustment. The GCP photogrammetric targets should be visible in the pictures and have about 5 ~ 10 times the dimensions of the GSD. Since the accuracy of the GCPs is crucial for the accuracy of the final results, the position of the GCPs should be measured precisely by total station or post-processing GPS. M.Chahbazi et al. (2015) state that although a large number of well-distributed GCPs as seen in Figure 5 (left) guarantees the highest accuracy, if it is impossible due to the field conditions, the best practice is to install the GCPs near the ends of the flight strips to be visible in several images from two closest strips. Furthermore, placing the GCPs with height variation is beneficial for the vertical adjustment of the UAV imagery. Figure 5: The methods to set up the GCPs in the article of M.Chahbazi et al. (2015) (left) when there are enough GCPs, and (right) if not. According to the construction survey manual of U.S. Department of Transportation (DOT), contractors or sub-contractors should establish control points (CPs), which are semi-permanent reference points built beside the construction site at intervals of 500 feet, to align the horizontal distribution and vertical elevation. Since these CPs are measured from the second-order benchmark, which has a ratio of closure of 1:10000, it is possible to construct accurate GCPs. Positioning of the UAV using space resection method The position of flying UAV has been determined from the GPS embedded on the UAV until now. However, the accuracy of the GPS depends on the satellite signal which sometimes includes serious errors such as cycle slip or multipath caused by the environmental conditions. Moreover, time synchronization between the GPS and images from the Camera can also cause several errors. In this regard, this study proposes a new positioning method that improves the accuracy of the photogrammetric results by applying space resection method. The resection method is to determine an unknown point from two known points. This measurement method is usually used when measuring the location of the device such as total station or theodolite. Figure 7: The concept of the space resection for UAV photogrammetry (Ref. https://dronemapper.com/uas_photo-grammetry_processing) The space resection requires at least two known ground control points per an image, but this study used five ground control points for the least square adjustment. The accuracy of the space resection only depends on the range error of the camera, which is much more accurate than RTK-GPS, and therefore this study expects an improvement in the positioning accuracy of the operating UAV As-built 3D model generation The stereo images extracted from UAV photogrammetry go through the image matching process. The image matching process is usually classified into correlation based method and feature-based method. The correlation based method has various computational processes because they conduct the image matching with all area and pixels. In contrast, since the feature based method adjusts images with edges or corners in the pictures, the processing is faster than the correlation based method. Scale-invariant feature transform (SIFT) is one of the most widely used features detecting method. The SIFT algorithm extracts key points from overlapped area, and align the images by using descriptors which are created from the extracted key points. The 3D structure is built by structure from motion (SfM) algorithm, which is a method to generate 3D structure by calculating the pose of the camera from 2D images. Most commercial software today has used the feature-based image matching and SfM algorithm to cre ate a 3D model. One of the commercial software is Agisoft PhotoScan which conduct image matching with the feature-based method. This study generates the as-built model of the roadway construction site based on the DSM generated from the Agisoft PhotoScan. The final as-built 3D model would be compared to the as-design model. An essential issue in this step is to synchronize the coordinates system used in both as-design model and as-built model. For this reason, it is essential that both models should be on the geographic information system (GIS) based on a global coordinate system. Verification Table 2 The whole process of this study Step 1 Step 2 Step 3 Step 4 Step5 Objectives Planning UAV operation Establishing GCPs Obtaining images from UAV Generating 3D model Verification Details GSD Flight Altitude Overlapping rate The number Location Resection QC of images SIFT, SfM DSM Field Test Error Assessment

Hamlet - Comparing the Dissimilar Characters of Gertrude and Ophelia Es

Hamlet -- the Dissimilar Characters of Gertrude and Ophelia  Ã‚  Ã‚        Ã‚  Ã‚   In Shakespeare’s tragedy Hamlet it is much less challenging to illustrate the lack of resemblance between Gertrude and Ophelia than it is to indicate the similarities between the two ladies.    The biggest difference between the two is the moral difference. Who can deny that the Queen has done some very serious sinning? Who can deny that Ophelia is a shy, obedient, innocent daughter? Lilly B. Campbell comments in â€Å"Grief That Leads to Tragedy† on Queen Gertrude’s sinful state:    Shakespeare’s picture of the Queen is explained to us by Hamlet’s speech to her in her closet. There we see again the picture of sin as evil willed by a reason perverted by passion, for so much Hamlet explains in his accusation of his mother:    You cannot call it love, for at your age The hey-day in the blood is tame, it’s humble, And waits upon the judgement; and what judgement Would step from this to this? . . . O shame! Where is thy blush? Rebellious hell, If thous canst mutine in a matron’s bones, To flaming youth let virtue be as wax And melt in her own fire. Proclaim no shame When the compulsive ardor gives the charge, Since frost itself as actively doth burn And reason panders will.    And of the Queen’s punishment as it goes on throughout the play, there can be no doubt either. Her love for Hamlet, her grief, the woes that come so fast that one treads upon the heel of another, her consciousness of wrong-doing, her final dismay are those also of one whose soul has become alienated from God by sin. (97-98)    Quite opposite the criminality of the king’s wife is the innocence of Ophelia, a â€Å"broken lil... ...agh's Hamlet." Early Modern Literary Studies 6.1 (May, 2000): 2.1-24 <URL: http://purl.oclc.org/emls/06-1/lehmhaml.htm>.    O’Donnell, Jessie F. â€Å"Ophelia.† The American Shakespeare Magazine, 3 (March 1897), 70-76. Rpt. in Women Reading Shakespeare 1660-1900. Ed. Ann Thompson and Sasha Roberts. New York: Manchester University Press, 1997.    Shakespeare, William. The Tragedy of Hamlet, Prince of Denmark. Massachusetts Institute of Technology. 1995. http://www.chemicool.com/Shakespeare/hamlet/full.html No line nos.    West, Rebecca. â€Å"A Court and World Infected by the Disease of Corruption.† Readings on Hamlet. Ed. Don Nardo. San Diego: Greenhaven Press, 1999. Rpt. of The Court and the Castle. New Haven, CT: Yale University Press, 1957.    Wilson, John Dover. What Happens in Hamlet. New York: Cambridge University Press, 1999.      

Abusing the Force Essays -- Law Enforcement Social Issues Police Essay

Abusing the Force The fundamental purposes of law enforcement is the serve and protect the individuals of society. Rough treatment is often times afflicted upon unruly citizens as an alternative reform of discipline. Police abuse remains one of the most serious and divisive human rights violations of today. The secrecy, stress, and dangers of police work leads to an insular and close-knit occupational culture that results in a strong distinction between members of the police and society. An in-depth investigation on police brutalization and its causes of corrupting within the 1991 beating of Rodney King is evaluated by means of the credibility within the rights of citizens in Canada and the United States, the effects from prejudice affliction, and the societal disparagement on morals of the cultures in policing. Corruption is both a result and cause of the separation of the police from society. The isolation of the police can lead to a divergence of the values of law enforcement officials from those that the rest of society professes to uphold (McAlary, 1997). The early morning of March 3, 1991 illustrates the horrific crime in Los Angeles, California. Several California Highway Patrol cruisers chase Rodney King, a robbery parolee, speeding over 110 miles per hour down the Los Angeles strip. King, an African American, is eventually forced to stop after running through several red lights at intersections. As the other two passengers of the car complies with police requests to exit the car and are subdued with minor resistance, King refuses to exit the car, thus a beating is administered by three Caucasian officers at the order of their sergeant who is on the scene. He is subsequently stricken over 56 times by wielding PR 24 metal batons, kicked at least 6 times, and shot twice with a Taser el ectronic stun gun, holding over 50,000 volts of electricity per shot (Lepour, 1991). Additionally, twenty-three other officers stand watching on the scene in which none made effort or suggestion to stop the crude combat. Consequently, King suffers extensive injuries including skull fractures, broken bones, and nerve damage to his face and body. Meanwhile, George Holiday, one of the several civilian by-standees awaken by noises of the police helicopter and sirens, videotapes the initial beating from his nearby apartment. Twelve days later, the three police officers ... ...r peers from the rest of society. The division may be further entrenched by a perception on the part of some officers of public animosity towards the police (Will, G. F., 1998). Every instance of corruption is further reinforces the distance between society and the police by increasing public hostility and distrust towards the police. Policing is an extremely emotional occupation and it is difficult for officers not to involve personally in their work. They are not merely human forms of robots, firing their guns arbitrarily with a complete lack of sense or emotion. No matter what type of activities police officers are involved in, they are often required to use force to rectify certain situations, thus this primary discrepancy is difficult to distinguish between what is required and what is excessive force. As long as police officers play by the rules of their peer group and the public continues to negatively label them, any rapprochement between the two is unlikely. Fundamentally, police officers rely primarily on instinct and as long as their basic intention is to promote good and not evil while citizens need to trust that the instincts of an officer are generally correct.

Reward Strategy: Reasons and Perspectives Essay

Modern business environment is famous for various new trends. An environment where the businesses used to hire employees for the sake of monetary benefits only is now changed in multi dimensional and multi pronged environment. Now business are not run for the sake of money and short term financial benefits only but for a long time sustainable growth and development. Now the only focus of all business is customer  and Customer Satisfaction. This Customer Satisfaction (CS) cannot be achieved without proper involvement of internal customers i. e. , employees. Companies start their business philosophy from their main goals or objectives and make clear statements showing their mission and values. All lateral developments are performed on the basis of these predetermined values. Modern businesses focus only on customer satisfaction and this is the core concept of business as well. Who is Responsible for Customer Satisfaction? Now question is the responsibility of achieving customer satisfaction without any failure. Many plans are made for wining customer satisfaction, but all would be failure if company is not sure about the persons, method and tactics of achieving customer satisfaction. Whole management and its team is responsible for achieving business results so is the customer satisfaction. Modern management has no doubt in it that customer satisfaction can only be achieved if all employees regardless their departments work hard to satisfy customer. Conclusion is all employees are responsible for achieving and maintaining customer satisfaction on long term basis. How would Employees work for Achieving Customer Satisfaction? Employees are important for achieving customer satisfaction then the responsibility comes how these employees should work for achieving high standards of customer satisfaction? It’s an open secret that employees mainly intend to work for the physical work giving to them according to their job description. Though companies make different efforts to ensure quantitative and qualitative efforts to ensure performance of employees but there is not specific way to know how do employees behave and work for achieving customer satisfaction. As per Hertz Berg’s two factor motivation theory, people treat salary and working environment as routine requirement of their jobs and don’t fee motivated on the basis of nominal salaries. For doing something extra, they need motivation and for motivation they need to be given something extra by the employer. To overcome problems and obstacles on their way to customer satisfaction, companies design a special approach to involve employees into their challenging task of customer satisfaction. Reward Strategy Why do people work is the question often answered differently by all respondents. Few people surely confirm the cause of their work, mostly are trapped in wordy reasons like, just to make my life comfortable, to earn my livelihood, to support my family, to spend my spare time or to establish myself. Business psychologists still fail to understand the only common reason among people who work at different places. Similar to the concepts of employees, business researchers and scholars are also divided on certain human needs and employees’ concern bout growth. But all researchers and business psychologists are of the opinion that rewards really award. If you give rewards to your employees reward, they will award business with better results. Various rewards to employees make different behavioural and motivational changes in their personalities. Almost modern business and non-business organizations believe in good reward system that would base on financial compensation or Remuneration, certain benefits regardless their job hierarchy and business status, and perquisites of different types based on hierarchy. These three factors make the most successful blend of modern reward package. As such package is a motivating blend of financial and non-financial benefits, this suites majority of people.

Can Everyone Benefits from Higher Education?

Can Everyone Benefit from Higher Education? Higher education refers to the level of learning that takes place at universities, colleges or degree-awarding institutions, which a person can attend after he or she completes high school or secondary school education. Higher education provides students with further knowledge on specific areas and awards the students with academic degrees or certificates. In the past, higher education was not seen as a â€Å"must† as nowadays because a competition in job market was not as high as at the present time.In formers times, higher education was popular in some societies, mainly western culture, and not so famous in other parts of the world, Thailand and Asian countries for example. Since the world is becoming more globalized, there are so many businesses appeared and all of them require capable employees who can make tasks run smoothly. Business owners hire people who have special knowledge that fit their businesses. Therefore, higher educ ation has become popular and necessary throughout the world.In additional, everyone can gain the benefit from further education. People can benefit from higher education in various ways; for instance, there are specific area of knowledge, practical skills, interpersonal skills, new colleagues and society. In terms of career, these qualities can lead to the better job, higher salaries, larger societies, and more development and advancement in skills, knowledge and performance, especially when compared with people who graduate from high school.In addition, higher education is a key that helps people avoiding unemployment during the time of economic recession when a number of jobs is limit. However, there are some people who do not attend higher education and the reasons are different, depend on personal circumstances. For example, they might not see an importance of going to university or college because they already have special skills that are required in the job market e. g. sport players, artists, singers, stars.Some people might have less opportunity to study than others e. g. money problems or physical disabilities. In some cases, social inequality and intelligence can also be barriers to higher education. For instance, people who are clever but their families are in poverty might not have the opportunity to study because higher education is frequently considered to be expensive. In order to resolve the tuition fee problem, government should support by give scholarships for students who have a good grade or the reasonable conditions.Nevertheless, there are also alternatives to higher education that could be the reason for not attending universities or colleges. Some organizations provide on-the-job trainings to their employee in order to increase work skills, which can be a major cause of ignoring higher education. Some people need some specific professional skills for their job, so they decide to attend vocational trainings or short-term career preparatio n programs instead.There are also some groups of people who believe in the value of self-study so they do not see the necessity of going to universities or colleges. They can learn by themselves through various ways such as reading books, discussing with people or experiencing real situations. In summary, everyone can benefit from higher education; at least they gain more knowledge and skills. The more people are educated, the more the world became more developed and advanced. Thus, higher education is waiting for everyone. Nobody is too old to learn.