Walailak Journal of Science and Technology最新文献_第4页

A New Algorithm to Detect Occluded Face from a Head Viewpoint using Hough Transform and Skin Ratio 基于霍夫变换和皮肤比的头部遮挡人脸检测新算法

Walailak Journal of Science and Technology Pub Date : 2014-10-26 DOI: 10.14456/VOL12ISS8PP

T. Charoenpong, Patarida Sanitthai

{"title":"A New Algorithm to Detect Occluded Face from a Head Viewpoint using Hough Transform and Skin Ratio","authors":"T. Charoenpong, Patarida Sanitthai","doi":"10.14456/VOL12ISS8PP","DOIUrl":"https://doi.org/10.14456/VOL12ISS8PP","url":null,"abstract":"The performance of current algorithms used in occluded face detection for surveillance systems is limited when detecting a face covered with an obstacle, or a non-frontal view of the face. Therefore, a method able to capture a face from any viewpoint is necessary. In this paper, we propose a new algorithm by using 2 subdivision regions and skin ratio for detecting occluded faces from any head viewpoint during +90 degrees to -90 degrees around the yaw axis. This algorithm consists of 3 steps: head region identification, skin extraction, and occluded face detection. First, the system is fed with an image sequence capturing the whole target body, to define the head region. The head region is detected using a blob technique under an experimental condition. Second, skin data is extracted, for computing skin ratio. Skin color is considered in multiple color spaces, and compared with a database by Mahalanobis Distance technique. Third, for occluded face detection, the human head area is equally divided into 2 vertical regions. The skin ratio of each part is used as a criterion for occlusion detection. To test the performance of the proposed algorithm, data from 35 subjects is used. The data of a subject is captured from any viewpoint of the head, varying from +90 degrees to -90 degrees. As this paper aims to develop surveillance systems, obstacles covering the whole face are focused on, such as helmets and masks. The accuracy rate of non-occluded face and occluded face detection is 98.81 and 94.90 %, respectively. The average accuracy rate is 95.39 %. The advantage of this method over recent research is that this is the first method to detect an occluded face from any viewpoint of the head varying from +90 degrees to -90 degrees. doi: 10.14456/WJST.2015.4","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"12 1","pages":"35-49"},"PeriodicalIF":0.0,"publicationDate":"2014-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66680329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Effect of Packaging on Postharvest Quality Changes of Longkong 包装对龙岗采后品质变化的影响

Walailak Journal of Science and Technology Pub Date : 2014-10-02 DOI: 10.14456/1191

K. Venkatachalam, M. Meenune

{"title":"Effect of Packaging on Postharvest Quality Changes of Longkong","authors":"K. Venkatachalam, M. Meenune","doi":"10.14456/1191","DOIUrl":"https://doi.org/10.14456/1191","url":null,"abstract":"Longkong has a short shelf life (3 to 5 days) at ambient temperature due to its pericarp browning and biochemical quality loss. The present study investigated the quality changes of longkong fruit during storage under passive modified atmospheric packaging (MAP) at ambient temperature (25 oC and at 85 % relative humidity). Fruit stored without MAP served as a control. The accumulation of headspace gas (% CO 2 ) in the fruit package was observed less than 65 % during all over the storage. The increase of fruit weight loss was effectively controlled in passive MAP storage than the control. Passive MAP storage maintained the lowest browning index values as compared to the control during storage. Throughout the storage, pericarp phenylanine ammonia lyase, polyphenol oxidase and peroxidase had higher activities in the control fruits. The significant changes in fruit pH, titratable acidity (TA), total soluble solids (TSS) and TSS/TA content were observed in both the control and passive MAP during the storage. Fruits stored under passive MAP had more scavenging ability than reducing power during storage. However, due to lower surface mould growth, the passive MAP stored longkong had a quality and shelf life of up to 12 days at ambient temperature. doi: 10.14456/WJST.2015.17","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"12 1","pages":"229-236"},"PeriodicalIF":0.0,"publicationDate":"2014-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66673089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Physicochemical Characterization and Corrosion Inhibition Potential of Ficus benjamina (FB) Gum for Aluminum in 0.1 M HCl 本雅明榕树(FB)胶在0.1 M HCl中对铝的缓蚀性能及理化性质

Walailak Journal of Science and Technology Pub Date : 2014-09-04 DOI: 10.14456/1222

N. Eddy, P. Ameh, A. Ibrahim

{"title":"Physicochemical Characterization and Corrosion Inhibition Potential of Ficus benjamina (FB) Gum for Aluminum in 0.1 M HCl","authors":"N. Eddy, P. Ameh, A. Ibrahim","doi":"10.14456/1222","DOIUrl":"https://doi.org/10.14456/1222","url":null,"abstract":"Examination of the physical (colour, odour, pH, solubility in various solvent) and chemical (GCMS and FTIR) characteristics of Ficus benjamina gum revealed that the gum is yellowish in colour, mildly acidic and ionic in nature. Major constituents of the gums were found to be sucrose and d-glucose, which constituted 60.92 % of its chemical constituents while various carboxylic acids (albietic acid (1.00 %); hexadecanoic acid (4.41 %); 9-octadecanoic acid (1.00 %), stearic acid (3.01 %); oleic acid (0.10 %); octadecanoic acid (9.12 %) and 6,13-pentacenequinone (20.43 %) accounted for the remaining constituents. Functional groups identified in the gum were found to be those typical for other carbohydrates. From the knowledge of the chemical structures of compounds that constitutes the gum, the corrosion inhibition potentials of the gum was ascertained and from weight loss analysis, the gum was found to be an active inhibitor against the corrosion of aluminum in solutions of tetraoxosulphate (VI) acid. The gum acted as an adsorption inhibitor that favours the mechanism of chemical adsorption and supported the Frumkin and Dubinin-Radushkevich adsorption models. doi: 10.14456/WJST.2015.94","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"12 1","pages":"1121-1136"},"PeriodicalIF":0.0,"publicationDate":"2014-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66672611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solution of Fifth Order Caudrey-Dodd-Gibbon-Sawada-Kotera Equation by the Alternative (G'/G)-Expansion Method with Generalized Riccati Equation 广义Riccati方程的五阶Caudrey-Dodd-Gibbon-Sawada-Kotera方程的可选(G′/G)展开法解

Walailak Journal of Science and Technology Pub Date : 2014-08-28 DOI: 10.14456/861

M. Shakeel, S. Mohyud-Din

引用次数: 1

Effect of Radiation and Magnetohydrodynamic Free Convection Boundary Layer Flow on a Solid Sphere with Convective Boundary Conditions 具有对流边界条件的实心球上辐射和磁流体动力自由对流边界层流动的影响

Walailak Journal of Science and Technology Pub Date : 2014-07-22 DOI: 10.14456/1040

H. Alkasasbeh, M. Salleh, R. M. Tahar, R. Nazar, I. Pop

引用次数: 3

Morphometric characters of Nile tilapia (Oreochromis niloticus) in Thailand 泰国尼罗罗非鱼的形态计量学特征

Walailak Journal of Science and Technology Pub Date : 2014-02-28 DOI: 10.2004/WJST.V11I9.909

P. Kosai, Piyadon Sathavorasmith, K. Jiraungkoorskul, W. Jiraungkoorskul

{"title":"Morphometric characters of Nile tilapia (Oreochromis niloticus) in Thailand","authors":"P. Kosai, Piyadon Sathavorasmith, K. Jiraungkoorskul, W. Jiraungkoorskul","doi":"10.2004/WJST.V11I9.909","DOIUrl":"https://doi.org/10.2004/WJST.V11I9.909","url":null,"abstract":"The present study is conducted to describe the morphometric characteristics of a Thailand strain of Oreochromis niloticus . The total length of the observed fish ranged from 7.96 - 17.36 cm. Body measurement and proportions are extensively used for identification of this species. The following 18 measurements are determined for each fish: Total length (TL); Standard length (SL); Body depth (BD); Pre-dorsal length (PDL); Pre-pectoral length (PPCL); Pre-pelvic length (PPVL); Pre-anal length (PAL); Depth of caudal peduncle (DCP); Length of caudal peduncle (LCP); Head length (HL); Eye diameter (ED); Snout length (SNL); Upper jaw length (UJL); Lower jaw length (LJL); Caudal fin length (CFL); Pectoral fin length (PFL); Length of dorsal fin base (LDFB); Length of anal fin base (LAFB). The rate of growth of different morphological body parts of the fish in relation to its total length is studied. Additionally, the total length and body weight relationship is found to be a straight line in logarithmic scale expressed as Log BW = 3.026 Log TL - 1.839. The value of regression co-efficient obtained for the length-weight relationship is 3.026. This finding suggests that selection for growth using this equation is a good alternative for measuring weight in the field, when accurate weighing balances are not available. Hence, the present study provides the information of the various body parts measurements of Tilapia and establishes mathematical equations relating to these various morphometric relationships which can be utilized for the conversion of one measurement into another. doi: 10.14456/WJST.2014.76","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"11 1","pages":"857-863"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68183679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Radiation effect on MHD stagnation-point flow of a nanofluid over an exponentially stretching sheet 辐射对纳米流体在指数拉伸薄片上MHD滞点流动的影响

Walailak Journal of Science and Technology Pub Date : 2014-01-29 DOI: 10.2004/WJST.V11I7.841

Imran Anwar, S. Shafie, M. Salleh

{"title":"Radiation effect on MHD stagnation-point flow of a nanofluid over an exponentially stretching sheet","authors":"Imran Anwar, S. Shafie, M. Salleh","doi":"10.2004/WJST.V11I7.841","DOIUrl":"https://doi.org/10.2004/WJST.V11I7.841","url":null,"abstract":"This paper theoretically investigates the radiation effect on magnetohydrodynamics (MHD) stagnation-point flow of a nanofluid over an exponentially stretching sheet under the assumptions of a small magnetic Reynolds number. The sheet is stretched with an exponential velocity in the presence of a non-uniform magnetic field B applied in a transverse direction normal to the flow. By using the modified Bernoulli's equation, a highly nonlinear nanofluid problem is modeled for an electrically conducting nanofluid. The momentum, thermal and concentration boundary layer thicknesses are intensified for the incorporated flow parameters such as Brownian motion parameter Nb, thermophoresis parameter Nt, Prandtl number Pr, Lewis number Le, Hartmann number Mexp and velocity ratio parameter e. Also by an appropriate similarity transformation, the system of nonlinear partial differential equations is reduced to ordinary differential equations. These equations subjected to the boundary conditions are solved numerically using the Keller-box method. Numerical results are plotted and discussed for pertinent flow parameters. A comparison with existing results in the literature is also provided.","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"11 1","pages":"569-591"},"PeriodicalIF":0.0,"publicationDate":"2014-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68183007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Series Solution for Painlevé Equation II 疼痛水平方程的级数解2

Walailak Journal of Science and Technology Pub Date : 2014-01-29 DOI: 10.2004/WJST.V11I12.832

F. Mabood, W. Khan, A. Ismail, I. Hashim

引用次数: 2

Generalized Fractional Integration of the H-Function Involving General Class of Polynomials 涉及一般多项式类的h函数的广义分数积分

Walailak Journal of Science and Technology Pub Date : 2014-01-20 DOI: 10.2004/WJST.V11I12.694

D. Kumar, P. Agarwal, S. Purohit

引用次数: 23

Design and Modal Analysis of Gravity Dams by Ansys Parametric Design Language 基于Ansys参数化设计语言的重力坝设计与模态分析

Walailak Journal of Science and Technology Pub Date : 2014-01-20 DOI: 10.2004/WJST.V11I12.866

S. Khosravi, M. Heydari

{"title":"Design and Modal Analysis of Gravity Dams by Ansys Parametric Design Language","authors":"S. Khosravi, M. Heydari","doi":"10.2004/WJST.V11I12.866","DOIUrl":"https://doi.org/10.2004/WJST.V11I12.866","url":null,"abstract":"For find the optimal shape of concrete gravity dams including dam-water-foundation rock interaction, model of 2-dimensional finite elements that include the dam, reservoir and foundation is provided using the finite element software ANSYS in the most widely used APDL (Parametric Design Language) language programming. To consider 11 geometry variables, finite element analyses of gravity dams are carried. The 11 geometric variables are modeled for each gravity dam and geometry. In order to check and verify the model and ensure the assumptions used during the modeling, the dam is considered in 4 different cases: 1) Dam with empty reservoir and rigid foundation. 2) Dam with empty reservoir and flexible foundation. 3) Dam with full reservoir and rigid foundation. 4) Dam with full reservoir and flexible foundation. To assess the accuracy of this modeling, the modal analysis and mode shapes of the Pine Flat, koyna and idealized triangular Dams is studied and the results are compared with other reference results. Numerical results show the merits of the suggested technique for gravity dam shape simulation. It is also found that considering the dam-water-foundation rock interaction has an important role for safely designing a gravity dam. doi: 10.14456/WJST.2015.13","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"12 1","pages":"167-180"},"PeriodicalIF":0.0,"publicationDate":"2014-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68182950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9