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Dissertations / Theses on the topic 'Height determination'
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1
Sandidge, Matthew Jay. "Truck height determination using digital video." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44893.
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Over-height trucks are not only a hazard to the over-height trucks themselves, but they pose a threat to the bridges they come into contact with, and most importantly the other drivers on the road way when a collision takes place with a low clearance structure. Therefore, there is a need for an over-height detection system that is affordable yet also reliable. At this time there exist over-height detection systems using laser and infrared beam devices however, they are expensive. This high cost makes it impossible for Department of Transportations across the nation to implement these systems at all low-clearance headroom roadways. In this research a machine vision based system is proposed to detect the height of trucks and provide a warning for over-height vehicles. The height determination will be completed using line detection and blob tracking; these two methods will be overlapped where an upper point of the truck can be compared to a lower point on the ground. These 2D coordinates will then be translated into 3D world coordinates that will provide an approximation of the truck height. If the truck is over the set height then a warning will sound. The accuracy of the test proves that the method is a reliable method of height determination, achieving a 96.59% accuracy rate for measured trucks. The method does have an error rate of 3.3%. The merit of this work is the creation of an automatic image based method which can provide height determination of trucks and is a low cost alternative to the current expensive laser and infrared detection systems.
2
Beamson, Glen Andrew. "Precise height determination of tide gauges using GPS." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282691.
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Alsaaq, Faisal. "Determination of Tide Height Using Global Navigation Satellite Systems." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/59047.
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This research studies the methodology of using GNSS for tide estimation. It mainly investigates suitable filtering methods to extract tide signal from temporal changes in GNSS estimated height of the sea surface. These GNSS heights were estimated in nearshore and offshore environments and factors affecting tide estimation in both environments were analysed. The results suggest that GNSS estimated tides is suitable for hydrographic surveying, marine geodesy and in real time for natural hazard warning systems.
4
Sandström, Gustav. "Height Determination of the Acceleration Region for Dayside Occurring Auroral Arcs." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153797.
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The aim for this bachelor thesis is to determine the altitude of the auroral acceleration region occuring on the dayside. Substantial work has already been done on this topic, but for occurrence at the nightside. In this paper only negative quasi-static potential structures were considered, as they are the main contributor for producing aurora. The data for this study was obtained by the Cluster satellite constellation, and was processed by scripting in MATLAB in order to find the events for this paper. Namely, 17 passages of the auroral oval, especially occurring within two magnetic local time sectors, symmetrically around noon (12 MLT). The results show that the acceleration region occurs from below 2 RE up to an altitude of 4.5 RE with an average of 3.40 ± 0.84 RE, considerably higher than for the nightside. More specifically, fore and afternoon sectors have altitude averages of 2.44 ± 0.49 RE and 4.00 ± 0.26 RE, respectively. A significant difference between the two sectors. By regarding the pseudo altitude and classifying identified events as either -part of a larger scale coherent structure or - a small scaleauroral arc, a general occurrence pattern and height-dependence of the AAR was discovered. The large-scale arcs occur on average at a higher altitude (3.89 ± 0.22 RE) than the small-scale arcs (2.82 ± 0.80 RE).
5
Sandström, Gustav. "Height determination of the acceleration region for dayside occuring auroral arcs." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199369.
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Zhang, Kefei. "An evaluation of FFT geoid determination techniques and their application to height determination using GPS in Australia." Thesis, Curtin University, 1997. http://hdl.handle.net/20.500.11937/910.
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A new, high resolution, high precision and accuracy gravimetric geoid of Australia has been produced using updated data, theory and computational methodologies. The fast Fourier transform technique is applied to the computation of the geoid and terrain effects. The long, medium and short wavelength components of the geoid are determined from the OSU91A global geopotential model, 2'x2' (residual gravity anomalies in a 3 degrees cap and 1'x1' digital terrain model (DTM), respectively.Satellite altimeter gravity data have been combined with marine gravity data to improve the coverage of the gravity data, and thus the quality of the geoid. The best gridding procedure for gravity data has been studied and applied to the gravity data gridding. It is found that the gravity field of Australia behaves quite differently. None of the free-air, Bouguer or topographic-isostatic gravity anomalies are consistently the smoothest. The Bouguer anomaly is often rougher than the free-air anomaly and thus should be not used for gravity field gridding. It is also revealed that in some regions the topography often contains longer wavelength features than the gravity anomalies.It is demonstrated that the inclusion of terrain effects is crucial for the determination of an accurate gravimetric geoid. Both the direct and indirect terrain effects need to be taken into account in the precise geoid determination of Australia. The existing AUSGEOID93 could be in error up to 0.7m in terms of the terrain effect only. In addition, a series of formulas have been developed to evaluate the precision of the terrain effects. These formulas allow the effectiveness of the terrain correction and precision requirement for a given DTM to be studied. It is recommended that the newly released 9"x9" DTM could be more effectively used if it is based on 15"x15" grid.It is estimated from comparisons with Global Positioning System (GPS) and Australian Height Datum Data that the absolute accuracy of the new geoid is better than 33cm and the relative precision of the new geoid is better than 10~20cm. This new geoid can support Australian GPS heighting to third-order specifications.
7
Zhang, Kefei. "An evaluation of FFT geoid determination techniques and their application to height determination using GPS in Australia." Curtin University of Technology, School of Surveying and Land Information, 1997. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=11047.
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A new, high resolution, high precision and accuracy gravimetric geoid of Australia has been produced using updated data, theory and computational methodologies. The fast Fourier transform technique is applied to the computation of the geoid and terrain effects. The long, medium and short wavelength components of the geoid are determined from the OSU91A global geopotential model, 2'x2' (residual gravity anomalies in a 3 degrees cap and 1'x1' digital terrain model (DTM), respectively.Satellite altimeter gravity data have been combined with marine gravity data to improve the coverage of the gravity data, and thus the quality of the geoid. The best gridding procedure for gravity data has been studied and applied to the gravity data gridding. It is found that the gravity field of Australia behaves quite differently. None of the free-air, Bouguer or topographic-isostatic gravity anomalies are consistently the smoothest. The Bouguer anomaly is often rougher than the free-air anomaly and thus should be not used for gravity field gridding. It is also revealed that in some regions the topography often contains longer wavelength features than the gravity anomalies.It is demonstrated that the inclusion of terrain effects is crucial for the determination of an accurate gravimetric geoid. Both the direct and indirect terrain effects need to be taken into account in the precise geoid determination of Australia. The existing AUSGEOID93 could be in error up to 0.7m in terms of the terrain effect only. In addition, a series of formulas have been developed to evaluate the precision of the terrain effects. These formulas allow the effectiveness of the terrain correction and precision requirement for a given DTM to be studied. It is recommended that the newly released 9"x9" DTM could be more effectively used if it is based on 15"x15" grid.It is estimated from comparisons with Global ++Positioning System (GPS) and Australian Height Datum Data that the absolute accuracy of the new geoid is better than 33cm and the relative precision of the new geoid is better than 10~20cm. This new geoid can support Australian GPS heighting to third-order specifications.
8
Shin, Dong Seok. "Applications of machine vision to cloud studies using stereoscopic satellite images." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309448.
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9
Johnston, Gary Michael, and n/a. "GPS heighting : the effect of the GPS antenna phase center variation on height determination." University of Canberra. Management & Technology, 2000. http://erl.canberra.edu.au./public/adt-AUC20060802.155533.
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This thesis examines the effect on height determination of the antenna phase centre
variation of GPS user segment antennae. A discussion of the various antenna types in
common use is followed by an explanation of the problem at hand. In particular the
effect of the antenna's environment on the phase centre variation is covered more
fully, since the phase variation phenomenon itself is largely unexplained in the
engineering community to date.
A number of examples of the heighting errors caused by this phenomenon are
presented, followed by specifically designed experiments, which quantify the effect.
Finally the phase centre variation itself is modelled for a particular GPS antenna in
common use by surveyors in Australia.
The overall conclusion, arrived at by demonstration, is that the antenna phase centre
offsets and the variation model are very important for high accuracy determinations of
height.
10
Kim, Sangseop. "Determination of Wall Thickness and Height when Cutting Various Materials with Wire Electric Discharge Machining Processes." BYU ScholarsArchive, 2005. https://scholarsarchive.byu.edu/etd/294.
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This thesis looks at the capabilities of cutting thin webs on Wire EDM machines that are difficult or impossible to machine using conventional methods. Covered is an investigation of how different material and web thickness affect the capability of machining thin-walled parts.
Five different metals are used for the test; Aluminum 6061 T6, Yellow Brass SS360, 420 Stainless Steel, D2 unheat-treated tool steel 25-30 RC, and D2 heat-treated tool steel 60-65 RC. The small parts were cut to a 6mm (0.2362 inch) height with six different wall thicknesses: 0.30mm (0.0118 inch), 0.25mm (0.0098 inch), 0.20mm (0.0078 inch), 0.15mm (0.0059 inch), 0.10mm (0.0039 inch), and 0.05mm (0.0020 inch). A Sodick AQ325L Wire EDM machine was utilized for testing.
The methods employed during the study include the following:
• Machine settings and offsets were limited to the default setting selected from the Sodick AQ325L database.
• Two different pre-test cuts were taken on the material to check for web bending during the cutting process.
• Hardness was tested for comparison of the web heights.
This thesis shows that bending increased as webs became thinner and that bending occurred toward the wire as the second side of the web was cut. Bending does affect the height of the web. Physical properties of materials also impacted the height of the web with the hardest material staying intact during the cutting process. This study shows that two factors, physical properties of materials and web thickness, significantly affect cutting results for thin web parts.
11
Odera, Patroba Achola. "Precise determination of a local geoid model and a reference height system for the establishment of a modern vertical geodetic datum." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/161036.
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Karki, Uttam. "Joint Determination of Rack Configuration and Shelf Space Allocation to Maximize Retail Impulse Profit." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578912008563221.
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Munalula, Francis. "A method for the non-destructive determination of the knotty core sizes of standing Pinus patula trees, based on ring width assessments at breast height and the pruning history." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4126.
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Thesis (MScFor (Forest and Wood Science))--University of Stellenbosch, 2010.ENGLISH ABSTRACT: The objective of this study was to develop and assess a methodology of using pruning information (age and height) and ring width measurements on increment core samples taken at breast height from standing pruned Pinus patula trees for modeling the knotty core sizes in the pruned section of a tree. A total of 170 trees from 17 compartments, representing a wide variety of growth sites from the Mpumalanga escarpment, were selected and destructively sampled. Sample trees were selected to represent the productive timber volume available from the compartments using stratified sampling. Sample discs were removed at breast height (1.3m) and at six meter height. After drying and sanding, the cross-sectional surfaces of one surface of each of the discs were scanned on a document scanner and the ring widths measured, using an image analysis program. A preliminary study, using 30 discs, was undertaken to ascertain the appropriate number of radii per disc to measure. A comparison between results of two opposite radii, as opposed to four radii, showed that the difference in mean ring width resulting from the two approaches was statistically not significant. In practice this means that for ring width assessment, sampling of increment cores opposite to one another at breast height would be sufficiently accurate to study average ring width variation across the radius of a tree. A study was also conducted to determine to what accuracy ring widths at six metre height could be predicted from breast height measurements. It was shown that cumulative growth at six metre height can be predicted from cumulative growth at breast height, site index and cambial age at breast height as independent variables (R2 = 0.96). Ring width measurements at breast height can, therefore, be used to predict incremental growth throughout the pruned section. Combined with available information on the pruning history of a stand (pruning heights and pruning age), this study proved that quantitative knowledge on incremental growth can be used as a basis for estimating changes in knotty core sizes along the entire pruned section of the stem. Analysis of variation for the entire data set from ring width measurements showed that there was far greater variation in knotty core percentages (the percentage of diameter occupied by knotty core) between different compartments than within compartments. Within a tree, the knotty core percentages between three stem sections, 0-2.4m, 2.4–4.8m, and 4.8-7m, were found to increase significantly from the bottom section (49.1%) to the top section (65.4%). A single 2.4m log from the pruned section of each tree was removed and processed into sawn timber at a sawmill. After drying of the boards, a sub-sample of sawn boards from 17 logs, one log from each compartment, was selected and reconstructed into log form. From the reconstructed log (reconstructed to represent their original position in the log) the actual knotty core size was estimated by measuring the distance from the pith to the end of the branch stub. A comparison of the actual knotty core sizes and the modelled knotty core sizes of a sub-sample of trees showed only a modest relationship (R2 = 0.62). Reasons for this might be variability in pruning quality, inaccurate pruning records, nodal swellings and the methodology used to measure the actual knotty core sizes. Knowledge of knotty core sizes of standing trees can be used for many different purposes. Two applications that were assessed and found to be useful include decision support for cross cutting logs and for sawmill production planning purposes. Sawmill simulation software was used to evaluate value -and grade recoveries under different scenarios. Results showed that cross-cutting the pruned sections of logs from a compartment with large within-tree knotty core size variation into shorter logs, as opposed to keeping the pruned sections as single logs, result in increases in grade and value recovery. It was also shown that sawing of pruned logs from compartments with relatively small knotty cores, results in much better grade recoveries than logs from compartments with relatively large knotty cores (this information will be useful for production planning purposes). It can be concluded that the methodology proposed to reconstruct knotty cores from tree ring measurements has the potential to be used as a decision aid in the forest and forest products industry.
14
Kiamehr, Ramin. "Precise Gravimetric Geoid Model for Iran Based on GRACE and SRTM Data and the Least-Squares Modification of Stokes’ Formula : with Some Geodynamic Interpretations." Doctoral thesis, KTH, Transporter och samhällsekonomi (stängd 20110301), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4125.
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Iran is one of the most complicated areas in the world from the view of rough topography, tectonic activity, large lateral density and geoidal height variations. The computation of a regional gravimetric geoid model with high accuracy in mountainous regions, especially with sparse data, is a difficult task that needs a special attention to obtain reliable results which can meet the needs of the today geodetic community. In this research different heterogeneous data has been used, which includes gravity anomalies, the high-resolution SRTM Digital Elevation Model (DEM), recently published GRACE Global Geopotential Models (GGMs), geological maps and GPS/levelling data. The above data has been optimally combined through the least-squares modification of Stokes formula with additive corrections. Regarding the data evaluation and refinement, the cross-validation technique has been used for detection of outliers. Also, several GGMs and DEMs are evaluated with GPS/levelling data. The impact of utilizing a high resolution SRTM DEM to improve the accuracy of the geoid model has been studied. Also, a density variation model has been established, and its effect on the accuracy of the geoid was investigated. Thereafter a new height datum for Iran was established based on the corrective surface idea. Finally, it was found that there is a significant correlation between the lateral geoid slope and the tectonic activities in Iran. We show that our hybrid gravimetric geoid model IRG04 agrees considerably better with GPS/levelling than any of the other recent local geoid models in the area. Its RMS fit with GPS/levelling is 27 cm and 3.8 ppm in the absolute and relative senses, respectively. Moreover, the relative accuracy of the IRG04 geoid model is at least 4 times better than any of the previously published global and regional geoid models in the area. Also, the RMS fit of the combined surface model (IRG04C) versus independent precise GPS/levelling is almost 4 times better compared to the original gravimetric geoid model (IRG04). These achievements clearly show the effect of the new gravity database and the SRTM data for the regional geoid determination in Iran based on the least-squares modification of Stokes’ formula.QC 20100906
15
Welker, Kenneth E. "Determination of tide heights from airborne bathymetric data." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/25836.
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Petsche, Clayton Jay. "The distribution of Galois orbits of low height." Thesis, 2003. http://hdl.handle.net/2152/858.
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Petsche, Clayton Jay Vaaler Jeffrey D. "The distribution of Galois orbits of low height." 2003. http://wwwlib.umi.com/cr/utexas/fullcit?p3119715.
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Tseng, Jung-Ho, and 鄭榮和. "Orthometric Height Determination by GPS Ellipsoidal Heights and a prior Information of Local Geoid." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/89196148514682628033.
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碩士國立成功大學
測量工程學系
89
The datum inconsistency must be taken into consideration for the orthometric height determination by integration of GPS heights,spirit heights and the geoidal undulation ,because those heights refer to different reference surfaces. In the study, a height datum transformation model has been developed,and the least squares collocation has been used for solving the systematic errors caused by a priori undulation model and height networks. It is shown that the transformation model developed in the study can improve the absolute accuracy of orthometric heights compared with models that do not consider the datum inconsistency problem and the systematic errors. The absolute accuracy of transformed orthometric heights is about 2-3 cm both for the local and for linear leveling height transformation with a global undulation model EGM96 or a local undulation model. But the relative accuracy of all transformation models tested in the study is similar.
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Pitakbunkate, Termpan. "Incorporating Rigorous Height Determination into Unified Fracture Design." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8233.
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Hydraulic fracturing plays an important role in increasing production rate in tight
reservoirs. The performance of the reservoir after fracturing can be observed from the
productivity index. This parameter is dependent on the fracture geometry; height, length
and width.
Unified fracture design (UFD) offers a method to determine the fracture
dimensions providing the maximum productivity index for a specific proppant amount.
Then, in order to achieve the maximum productivity index, the treatment schedules
including the amount of liquid and proppant used for each stage must be determined
according to the fracture dimensions obtained from the UFD.
The proppant number is necessary for determining the fracture geometry using
the UFD. This number is used to find the maximum productivity index for a given
proppant amount. Then, the dimensionless fracture conductivity index corresponding to
the maximum productivity index can be computed. The penetration ration, the fracture
length, and the propped fracture width can be computed from the dimensionless fracture
conductivity. However, calculating the proppant number used in UFD requires the fracture height as an input. The most convenient way to estimate fracture height to input
to the UFD is to assume that the fracture height is restricted by stress contrast between
the pay zone and over and under-lying layers. In other words, the fracture height is
assumed to be constant, independent of net pressure and equal to the thickness of the
layer which has the least minimum principal stress. However, in reality, the fracture may
grow out from the target formation and the height of fracture is dependent on the net
pressure during the treatment. Therefore, it is necessary to couple determination of the
fracture height with determination of the other fracture parameters.
In this research, equilibrium height theory is applied to rigorously determine the
height of fracture. Solving the problem iteratively, it is possible to incorporate the
rigorous fracture height determination into the unified fracture design.
20
Huang, Hsing-Lu, and 黃星陸. "People localization and height determination for dense crowds using multiple cameras." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/99373121073131806114.
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碩士國立交通大學
多媒體工程研究所
99
In recent years, researchers have been paying much attention on people tracking and localization using multiple cameras. Most of methods require a large number of computations to cope with serious occlusions, and need to rely on special hardware to achieve real-time locating and tracking. Unlike these studies, we use two dimension line samplings of foregrounds to restrict regions of possible locations of people. According to the nature of occupancy constraint that possible locations of people should be covered by more projected foreground pixels, we propose a random algorithm to efficiently find the locations and number of people. Our methods can provide real-time location results because of the smaller of searching space from line sampling and less computing time due to the randomness nature. Besides, we exploit the concept of people volume so that uniformly sampling on the ground plane can prevent error from occlusions. Experimental results show that our approach provides real-time and accurate people localization results under serious occlusions.
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翟邦和. "GPS determination of ship attitude for improving shipborne sea surface height." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/02017964160093656319.
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碩士國立交通大學
土木工程學系
100
In this research, a GPS multi-antenna system has been built in the campaigns of collecting shipborne gravity with 1-Hz data rate. The positioning package TRACK is used for kinematic relative positioning (KRP). The assessment of baseline length suggests that the accuracy of KRP from TRACK reaches 1cm in a static condition and 2 cm on a ship. A computer program has been built to compute ship attitudes from kinematic baselines by the direct computation formulas (DCF). The estimated attitudes are used to correct for the antenna height to the sea surface due to attitude effect. The comparison between GPS and GPS/INS-derived attitudes suggest that GPS attitude system and DCF function properly. With the attitude effect accounted, the RMS crossover differences of the corrected SSHs are improved by 0.5 cm, or 3.31% relatively, compared to the case of raw SSHs. With the ocean tide corrected, the difference between corrected SSHs and DTU10 modeled values are reduced by 0.7 cm in standard deviation along straight survey lines, and by 1.4 cm along non-straight lines, corresponding to relative improvements of 3.45% and 4.07%, respectively.
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Chen, Yung-Chang, and 陳永昌. "Application of Lidar Power Ratio on Determination of Cloud Base Height and Aerosols Hygroscopicity." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/krwg27.
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碩士國立臺灣大學
大氣科學研究所
105
In this study, a new parameter of Power Ratio (PR), the ratio of original signal of RCEC Lidar (355, 532 nm), is introduced to illustrate the lidar signal affected by aerosols. PR was simulated at different atmospheric conditions incoporating Köhler theory and scattering theory. The hygroscopicity parameter of aerosols (κ) and cloud base height were determined by the comparision of the simulation and lidar signal. The results show that PR is mainly dependent on the size distribution of ambient aerosols, which were then controlled by dry size distribution, κ, and relative humidity (RH). In general, larger κ, RH and dry size distribution would cause larger PR. In addition, PR is affected by refractive index (m) with scattering theory. A larger imaginary part (absorption part) would result in a larger PR, while a larger real part (scattering part) would result in a smaller PR. For case studies, PR profiles are simulated for three cases: 2009/1/13, 2010/10/31 and 2013/10/26, with well mixed boundary layer. In these cases, RH increases with altitude, so PR increases as RH increases. Furthermore, the rising slope of PR with height will be affected by κ. In cases of 2009/1/13 and 2010/10/31, the results of simulation for a given κ = 0.2 are more consistent with the observation result, while κ = 0.4 for the case of 2013/10/26. In the comparison of simulation and observation, the ambient size distribution of aerosols plays a major role to control PR. As the cloud droplets present, the overall wet size distribution shifts dramatically and cause a significant change in backscattering ratio (R), depolarization ratio (DP) and PR. Such dramatically change was applied to determine the cloud base height, which is more sensitive in PR but less sensitive in DP. To fit the observed PR, κ and RH profile were adjusted in the simulation. Overall, cloud base heights determined in this study using different methods are consistent for cases of 2009/1/13 and 2013/10/26. Therefore, PR defined in this study can be an index of κ and further procide a better indication for the cloud base height, which could be useful to understand the eddies in the boundary layer for the future.
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Ackermann, Anja. "The use of permanent maxillary and mandibular canines in sex and age determination in a South African sample." Diss., 2013. http://hdl.handle.net/2263/33174.
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Dental anthropologists study the variation around the common shared patterns of teeth.
These differences in the development, size and morphology of teeth are often used to help
estimate the age and sex of unknown individuals. The aim of the study was two-fold. Firstly,
it was determined whether sexually dimorphic characteristics exist in the size of permanent
canines of South Africans, and whether these differences are of sufficient magnitude to
make them usable as a method to determine sex from unknown remains. For this purpose
the mesiodistal and buccolingual crown diameters and the maxillary/mandibular canine index
were used. Secondly, the Lamendin technique of age estimation was tested and adapted to
a South African sample. Therefore, this study aimed to assess the usability of human
permanent canines in the determination of two demographic characteristics, namely sex and
age, in a South African sample. A sample of known sex, age and population group was
obtained from the Pretoria Bone Collection (University of Pretoria, South Africa) and the
Raymond A. Dart Collection (University of Witwatersrand, Johannesburg, South Africa). The
canines of 498 skulls were measured from four groups namely, black males, black females,
white males and white females. The age of the sample ranged from 20 to 90 years. Using
discriminant function analysis, it was possible to differentiate between the sexes with a
relatively good accuracy of up to 87%. It was also evident that the two populations differed
from one another as far as tooth size is concerned. Lamendin’s method of age estimation
yielded poor precision and accuracy. Periodontosis was better correlated with age than root
transparency, where the highest R2 value was 0.35. In summary it seems that the
dimensions of the canine are useful in estimation of sex, should the population group be
known. The Lamendin technique, however, gave relatively poor results even though new
population specific formulae were created for the black and white populations of this sample.
It could only estimate the age of the sample with an R2 value of 0.41 and mean errors
ranging from 12.02 to 15.76 years.Dissertation (MSc)--University of Pretoria, 2013.
gm2014
Anatomy
unrestricted
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Link, Roman Mathias. "The role of tree height and wood density for the water use, productivity and hydraulic architecture of tropical trees." Thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-13EF-9.
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Chen, Shih-Hsing, and 陳世興. "Determinating the optimal strokewidth-to-height ratio and width- to-height ratio in Chinese characters." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/85780185472261065215.
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碩士國立台灣工業技術學院
管理技術研究所
85
The purpose of this study was to determine the optimal strokewidth-to-heightratio (S/H ratio) and width-to-height ratio (W/H ratio) in Chinese characters;moreover, whether these optimal ratios were contingent to the strokes number and configuration type of Chinese characters. Two experiments were conducted in this study.Experiment 1 aimed to determinethe optimal S/H ratio. The S/H ratio, strokes number and configuration type were employed as independent variables. Twenty subjects were asked to tell whatwas the character displayed with a tachistoscopic equipment. The rate of correct recognition was used as dependent variable. Experiment 2 aimed to determine the optimal W/H ratio.The W/H ratio, strokes number and configurationtype were employed as independent variables.Its experiment design was the sameas that of experiment 1. Experiment results indicated that all independent variables significantly affect the rate of correct recognition. Besides, the maximal rates of correct recognition were under 8% of S/H ratio, and under 1.25 of W/H ratio. Based on these findings,we recommended that the optimal S/H ratio of Chinese charactersis 8%±1% (S:H=1:11~1:14), and the optimal W/H ratio of Chinese characters is between 1.00 and 1.25.
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PICHLÍKOVÁ, Jana. "Zjišťování poklesu půdního horizontu na odvodněných plochách geodetickými metodami." Master's thesis, 2009. http://www.nusl.cz/ntk/nusl-51269.
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