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Longshore Current on an Equilibrium Beach

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China Ocean Engineering 1996年第2期11卷 181-192页

作者： chang hsien-kuo and HsuTai-Wen’ Associate Professor, Department of Civil Engineering, National Chiao Tung University, 1001 Ta-Hsueh Rd.,Hsinchu, 300 Taiwan . Associate Professor, Department of Hydraulics and Ocean Engineering, National Cheng Kung University,Tainan Department of Civil Engineering National Chiao Tung University Hsinchu 300 1001 Ta-Hsueh Rd. Taiwan Dept. of Hydr. and Ocean Engineering National Cheng Kung University Tainan Taiwan

Natural beaches tend to be concave-up rather than planar and are reasonable to be modeled by an equilibrium beach profile. A governing equation for longshore current on an equilibrium beach is derived and its analytical solution is given in this paper. Through comparisons of the present solution and field data of longshore current for a step-type beach, the present solution is found to have fairly agreeable prediction to longshore current inside the surf zone. The effects of the shape of a concave-up beach and turbulent mixing stress on longshore current inside the surf zone are discussed in the present paper.

关键词： longshore current equilibrium beach profile surf zone turbulent mixing stress

Long Wave Reflection and Transmission over A Sloping Step

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海洋工程：英文版 2004年第3期18卷 371-380页

作者： hsien-kuo chang Jin-Cheng LIOU Department of Civil Engineering National Chiao Tung University 1001 Ta Hsuech Road Hsinchu 300 ChinaDepartment of Civil Engineering National Chiao Tung University 1001 Ta Hsuech Road Hsinchu 300 China

This investigation examines long wave reflection and transmission induced by a sloping step. Bellman and Kalaba's (1959) invariant imbedding is introduced to find wave reflection. An alternative method matching both the surface elevation and its surface slope of each region at the junction is applied to the determination of wave reflection and transmission. The proposed methods are compared with the accurate numerical results of Porter and Porter (2000) and those of Mei (1983) for a vertical step. The wave reflection obtained for a mildly sloping step differs significantly from the result of Mei. The wave reflection is found to fluctuate owing to wave trapping for the mild sloping step. The height and the face slope of the step are important for determining wave reflection and transmission coefficients.

关键词： long wave reflection coefficient wave transmission wave trapping

Matched glass-to-Kovar seals in N_2 and Ar atmospheres

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International Journal of Minerals,Metallurgy and Materials 2013年第9期20卷 874-882页

作者： Cheng-hsien kuo Pi-ying Cheng chang-pin Chou Department of Mechanical Engineering Chiao Tung University

The oxidation of Kovar alloy was investigated, the wetting and spreading behavior of hard and soft glasses on Kovar alloy were studed by using the sessile drop method, and the quality and the seal strength of glass-Kovar seals were tested. The experimental results indicated that the preoxidation of Kovar alloy for approximately 10 min at 700℃ in air resulted in excellent adherence in glass-Kovar seals. The wetting and spreading behavior of glass on preoxidized Kovar alloy were superior to that on nonoxidized Kovar alloy. The wetting ability of ASF110 glass, at 950℃ and 980℃ in Ar and N2 atmospheres, was significantly superior to that of ASF200R and ASF700 glasses. The seal quality of the glass-preoxidized Kovar seal was superior to that of the glass-nonoxidized Kovar seal. The shear strength of the ASFll0 glass-preoxidized Kovar seal, which was prepared at 980℃ for 20 min in an Ar atmosphere, was approximately 3.9 MPa.

关键词： Kovar alloy glass sealing argon nitrogen oxidation wetting

Applying machine learning to market analysis:Knowing your luxury consumer

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Journal of Management Analytics 2019年第4期6卷 404-419页

作者： kuo Chi-hsien Shinya Nagasawa Department of Commerce Waseda UniversityShinjuku-kuJapan

Chinese consumer research in the luxury sector is the emphasis in the business research ***,it can be cost-intensive or time-consuming to interpret big data from any research conducted in the *** this paper,the researchers created a machine-learning model to help minimize those research *** study analyzed Chinese luxury consumption behavior,while the Chinese contributed 33%of the global luxury market in 2018 and play as a growth engine in the luxury market(Bain&***://***/insights/whats-powering-chinas-market-for-luxury-goods/).The researchers interpreted this analysis using machine-learning algorithms through different sets of conditions and then proposed an understandable and highly accurate machine-learning *** traditional statistical methods,which rely on domain experts to create handcrafted features,this paper proposes an unsupervised end-to-end model that can directly and accurately process questionnaire data without human *** paper also demonstrates how to practically apply an automatic unsupervised analysis method(PCA)to find inferences in the big data,and helps interpret the implied meaning to the questions.

关键词： Luxury consumer machine learning end-to-end model unsupervised learning principal component analysis(PCA)

ON ACTION-MINIMIZING SOLUTIONS OF THE TWO-CENTER PROBLEM

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Acta Mathematica Scientia 2022年第6期42卷 2450-2458页

作者： kuo-chang CHEN Department of Mathematics National Tsing Hua UniversityHsinchuTaiwanChina

The two-center problem,also known as Euler's three-body problem,is a classic example of integrable *** its periodic solutions,planetary type solutions are periodic solutions which enclose both *** by advances on n-body and n-center problems via variational techniques developed during the past two decades,a recent paper(***.2022)shows the minimizing property of planetary type solutions for any given masses of centers at fixed positions,as long as the period is above a mass-dependent threshold *** this paper,we provide further discussions regarding this minimizing *** particular,we improve the above-mentioned mass-dependent threshold value by refining estimates for action values.

关键词： two-center problem n-body problem variational method collision singularity

Optimizing SUS 304 wire drawing process by grey relational analysis utilizing Taguchi method

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Journal of University of Science and Technology Beijing 2008年第6期15卷 714-722页

作者： Al-Refaie Abbas Ming-hsien Li kuo-Cheng Tai Department of Industrial Engineering University of Jordan Amman Jordan Department of Industrial Engineering and Systems Management Feng Chia University Taichung China Taipei Department of Mechanical and Computer-Aided Engineering Feng Chia University Taichung China Taipei

In the stainless steel 304 （SUS 304） wire drawing process, optimizing the die life and wire tensile strength, which are the larger-the-better quality characteristics （QCH） types, is of main interest. Three control factors, involving reduction ratio, lubricant temperature, and drawing speed, were investigated utilizing L9（34） orthogonal array （OA）. The grey relational analysis was conducted for the normalized signal-to-noise （S/N） ratios. The ordinal value of the grey grade was then used to decide optimal factor levels. The anticipated improvements in die life and wire tensile strength were estimated 25.31 h and 22.50 kg/mm2, respectively. To decide the significant factor which had effect on each QCH and predict the average value of each QCH, analysis of variance （ANOVA） was performed for S/N ratio and QCH. Confirmation experiments were then conducted, where a good overlap was noticed between the predicted and confirnation intervals for each QCH. The Hotelling T2 and the sample generalized variance control charts were finally utilized in controlling and monitoring future production. In conclusion, the grey relational analysis utilizing Taguchi method is an effective approach for optimizing the die life and wire tensile strength for SUS wire drawing process. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： stainless steel grey relational analysis analysis of variance (ANOVA) optimization control charts

Numerical Approach to Film Cooling Effectiveness Over a Plate Surface with Coolant Impingement

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Journal of Thermal Science 2004年第1期13卷 67-74页

作者： chang-hsien Tai Jr-Ming Miao A-Fu Kao Department of Vehicles Engineering National Pingtung University of Science and TechnologyPingtungTaiwanChinaDepartment of Mechanical EngineeringChung Cheng Institute of TechnologyNational Defense UniversityTaoyuanTaiwanChinaGraduate School of Defense Science StudiesChung Cheng Institute of TechnologyNational Defense UniversityTaoyuanTaiwanChina

The aim of the present study is conducting the numerical approach to a combination of internal jet impingement and external film cooling over a flat plate. A multi-block three-dimensional Navier-Stokes code, CFX 4.4, with k-e turbulence model is used to simulate this complicated thermal-flow structure induced by the interaction of coolant jet and hot cross mainstream. By assuming the adiabatic wall boundary condition on the tested film-cooled plate, both the local and the spanwise-averaged adiabatic film cooling effectiveness are evaluated for comparison of the cooling performance at blowing ratios of Br=0.5, 1.0, and 1.5. Film flow data were obtained from a row of five cylindrical film cooling holes, inclined in angle of 35?and 0?in direction of streamwise and spanwise, respectively. The film cooling hole spacing between adjacent holes is 15 mm for all the holes. Before the coolant flow being injected through individual cooling hole then encountered with the mainstream, an impingement chamber containing an impingement plate with 43 holes is located on the path of coolant flow. Present study also focused on the effect of impingement spacing, 10mm, 20mm, and 30mm. Compare the results, we find the impingement jet has a significant effect on the adiabatic film cooling effectiveness. As the coolant impingement spacing is fixed, results indicated that higher blowing ratio would enhance the local and the spanwise-averaged adiabatic film cooling effectiveness. Moreover, neither uniform nor parabolic distribution of pressure distribution are observed within the coolant hole-pipe.

关键词： film cooling impingement cooling CFD turbulence model.

Distance Estimates for Simple Choreographic Solutions of the Three-body Problem

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Acta Mathematica Sinica,English Series 2022年第10期38卷 1823-1830页

作者： kuo chang CHEN Bo Yu PAN Department of Mathematics “National Tsing Hua University”HsinchuTaiwanChina Department of Applied Mathematics “National Chung Hsing University”TaichungTaiwanChina

In this article we estimate mutual distances of simple choreographic solutions for the Newtonian three-body *** formulas will be proved and our applications include the famous figure-8 orbit.

关键词： n-body problem variational method mutual distance

A diagnostic dilemma:acute abdomen presenting as segmental arterial mediolysis masked by a ruptured hepatocellular carcinoma

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Gastroenterology Report 2017年第3期5卷 244-246,I0003页

作者： Chen-Yi Liao Wu-hsien kuo En-Hua Huang An-Tie Hsieh Ching-chang Le Chi-chang Tsai Chao-Wen Hsueh Department of Medicine Kaohsiung Armed Forces General HospitalKaohsiungTaiwan

A 65-year-old male was brought to our hospital with right upper abdominal fullness sensation and recent body weight loss of about 3 *** patient had developed episodes of melena following progressive abdominal muscular guarding and drop of haemoglobin level to 6.3 g/*** abdominal computed tomography scan disclosed a ruptured hepatocellular cell carcinoma.A segmental arterial mediolysis was found on the superior mesenteric artery in the process of repairing the ruptured right hepatic artery with the assistance of *** embolization was carried out and permanent haemostasis was achieved.

关键词： segmental arterial mediolysis hepatocellular carcinoma