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Recursion Formulae for Obtaining Surfaces with Constant MeanCurvature inR^2,1

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Communications in Theoretical Physics 2007年第2期47卷 203-208页

作者： TIAN Yong-Bo nan Zhi-Jie TIAN chou Department of Mathematics University of Science and Technology. of China Hefei 230026China

Though the Bǎcklund transformation on time-like surfaces with constant mean curvature surfaces in R^2,1 has been obtained, it is not easy to obtain corresponding surfaces because the procedure of solving the related integrable system cannot be avoided when the Bǎcklund transformation is used, For sake of this, in this article, some special work is done to reform the Bǎcklund transformation to a recursion formula, by which we can construct time-like surfaces with constant mean curvature form known ones just by quadrature procedure.

关键词： Bǎcklund transformation time-like surfaces with mean curvature Lax pairs recursion formula

Optimization Model for Selecting Temporary Hospital Locations During COVID-19 Pandemic

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Computers, Materials & Continua 2022年第1期70卷 397-412页

作者： Chia-nan Wang Chien-Chang chou Hsien-Pin Hsu Van Thanh Nguyen Viet Tinh Nguyen Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Shipping Technology National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Supply Chain Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam

The two main approaches that countries are using to ease the strain on healthcare infrastructure is building temporary hospitals that are specialized in treating COVID-19 patients and promoting preventive *** such,the selection of the optimal location for a temporary hospital and the calculation of the prioritization of preventive measures are two of the most critical decisions during the pandemic,especially in densely populated areas where the risk of transmission of the virus is *** the location selection process or the prioritization of measures is poor,healthcare workers and patients can be harmed,and unnecessary costs may come into *** this study,a decision support framework using a fuzzy analytic hierarchy process(FAHP)and a weighted aggregated sum product assessment model are proposed for selecting the location of a temporary hospital,and a FAHP model is proposed for calculating the prioritization of preventive measures against COVID-19.A case study is performed for Ho Chi Minh City using the proposed decision-making *** contribution of this work is to propose a multiple criteria decision-making model in a fuzzy environment for ranking potential locations for building temporary hospitals during the COVID-19 *** results of the study can be used to assist decisionmakers,such as government authorities and infectious disease experts,in dealing with the current pandemic as well as other diseases in the *** the entire world facing the global pandemic of COVID-19,many scientists have applied research achievements in practice to help decision-makers make accurate decisions to prevent the *** the number of cases increases exponentially,it is crucial that government authorities and infectious disease experts make optimal decisions while considering multiple quantitative and qualitative *** such,the proposed approach can also be applied to support complex decision-making processes in a fuzzy environment in di

关键词： COVID-19 WHO MCDM preventive measures fuzzy theory FAHP WASPAS

Two-Stage Production Planning Under Stochastic Demand:Case Study of Fertilizer Manufacturing

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Computers, Materials & Continua 2022年第1期70卷 1195-1207页

作者： Chia-nan Wang Shao-Dong Syu Chien-Chang chou Viet Tinh Nguyen Dang Van Thuy Cuc Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Sunline NP Telecommunications Co.Ltd Kaohsiung80778Taiwan Department of Shipping Technology National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam Faculty of Industrial Engineering and Management International UniversityHo Chi Minh City70000Vietnam

Agriculture is a key facilitator of economic prosperity and nourishes the huge global *** achieve sustainable agriculture,several factors should be considered,such as increasing nutrient and water efficiency and/or improving soil health and *** fertilizer is one of the fastest and easiest ways to improve the quality of nutrients inland and increase the effectiveness of crop *** supplies most of the necessary nutrients for plants,and it is estimated that at least 30%-50%of crop yields is attributable to commercial fertilizer nutrient *** is always a major concern in achieving sustainable and efficient *** reasonable and customized fertilizerswill require a significant increase in the number of formulae,involving increasing costs and the accurate forecasting of the right time to apply the suitable *** alternative solution is given by two-stage production planning under stochastic demand,which divides a planning schedule into two *** primary stage has non-existing demand information,the inputs of which are the proportion of raw materials needed for producing fertilizer products,the cost for purchasing materials,and the production *** total quantity of purchased material and produced products to be used in the blending process must be defined to meet as small as possible a paid *** the second stage,demand appears under multiple scenarios and their respective *** stage will provide a solution for each occurring scenario to achieve the best *** two-stage approach is presented in this paper,the mathematical model of which is based on linear integer *** the diversity of fertilizer types,themathematicalmodel can advise manufacturers about which products will generate as much as profit as ***,two objectives are taken into ***,the paper’s thesis focuses on minimizing overall system costs,e.g.,including inventory cost,pur

关键词： Two-stage stochastic programming demand uncertainty planning blending fertilizer

General solution model and its new progress

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 577-585页

作者： Kuo-Chih chou University of Science and Technology Beijing Beijing 100083China

The physicochemical properties of multicomponent systems are involved in all fields of chemistry and have received attention from various related areas such as minerals,metallurgy,material science,environment,biology,and *** present,the relevant data can be obtained by using two major calculation methods,namely,the first principle method and the empirical *** the former has achieved recent great progress,it is still a long way to offer practical data;while the latter has not received progress for almost half a ***,a new method that is theoretically reasonable and accurate in practical application is necessary to obtain practical and precise physicochemical data for ternary and multicomponent *** this paper,a new theoretical model is suggested based on its corresponding binary *** feasibility of this theoretical model is discussed in terms of both theoretical analysis and practical performance.

关键词： multicomponent system physicochemical properties solution model phenomenological theory

Heuristic Scheduling of Job Orders in a Build-to-Order Manufacturing System

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Computer Systems Science & Engineering 2022年第3期40卷 1059-1072页

作者： Chia-nan Wang Chien-Chang chou Yu-Chi Chung Nguyen Ky Phuc Phan VanThanh Nguyen Viet Tinh Nguyen Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Shipping Technology National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Faculty of Industrial Engineering and Management International UniversityHo Chi Minh City70000Vietnam Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam

With the continuous development of technology,traditional manual work has been becoming more and more *** large or medium-sized companies have applied Enterprise Resource Planning(ERP)software into their business and production ***,since many small firms cannot afford ERP because of its expensive cost,they often still employ manual work for the same tasks this software resolves,especially for *** paper aims to provide a possible solution for small businesses to try automated scheduling and discover whether it can help *** are two main ways to make this determination:a mathematical model and a heuristic model,which are suitable for assessing low-and medium-sized workloads,*** case study was carried out in a small domestic interior furniture company,particularly in scheduling for their customized products in two-stage flow ***,they produce according to the sequence of customers’***,when we applied these supportive tools with batch-processing machines,they experienced enhanced production performance due to diminishing setup time for distinctive items and a more streamlined arrangement of job *** changes were implemented for some small companies that do not use many production stages and have a suitable number of jobs and *** this method were applied to larger demands,it would need further improvement and development to become a complete tool that can perform like a part of an ERP system.

关键词： scheduling mathematical heuristic flow shop batch-processing

Turbulence and cavitation models for time-dependent turbulent cavitating flows

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Acta Mechanica Sinica 2011年第4期27卷 473-487页

作者： Chien-chou Tseng Department of Mechanical Engineering University of Michigan

Cavitation typically occurs when the fluid pressure is lower than the vapor pressure at a local thermodynamic state, and the flow is frequently unsteady and turbulent. To assess the state-of-the-art of computational capabilities for unsteady cavitating flows, different cavitation and turbulence model combinations are conducted. The selected cavitation models include several widely-used models including one based on phenomenological argument and the other utilizing interface dynamics. The k-e turbulence model with additional implementation of the filter function and density correction function are considered to reduce the eddy viscosity according to the computed turbulence length scale and local fluid density respectively. We have also blended these alternative cavitation and lustrate that the eddy viscosity turbulence treatments, to ilnear the closure region can significantly influence the capture of detached cavity. From the experimental validations regarding the force analysis, frequency, and the cavity visualization, no single model combination performs best in all aspects. Furthermore, the implications of parameters contained in different cavitation models are investigated. The phase change process is more pronounced around the detached cavity, which is better illustrated by the interfacial dynamics model. Our study provides insight to aid further modeling development.

关键词： Cavitation Turbulence model Cavitationmodel Hybrid model

Adaptive peer-to-peer streaming with MutualCast

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 737-748页

作者： chou Philip A Microsoft Research One Microsoft Way Redmond WA 98052 USA

Application Layer Multicast (ALM) can greatly reduce the load of a server by leveraging the outgoing bandwidth of the participating nodes. However, most proposed ALM schemes become quite complicated and lose bandwidth efficiency if they try to deal with networks that are significantly heterogeneous or time-varying. In earlier work, we proposed MutualCast, an ALM scheme with fully connected mesh that quickly adapts to the time-varying networks, while achieving provably optimal throughput performance. In this paper, we study how MutualCast can be paired with adaptive rate control for streaming media. Specifically, we combine Optimal Rate Control (ORC), our earlier control-theoretical framework for quality adaptation, with the MutualCast delivery scheme. Using multiple bit rate video content, we show that the proposed system can gracefully adjust the common quality received at all the nodes while maintaining a continuous streaming experience at each, even when the network undergoes severe, uncorrelated bandwidth fluctuations at different peer nodes.

关键词： Peer-to-peer streaming, Distribution capacity, Quality adaptation, MutualCast

Expression of altered retinoblastoma protein inversely correlates with tumor invasion in gastric carcinoma

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World Journal of Gastroenterology 2006年第44期12卷 7188-7191页

作者： nan-Hua chou Hui-Chun Chen nan-Song chou Ping-I Hsu Hui-Hwa Tseng Department of Surgery Veterans General Hospital-Kaohsiung Taiwan China Department of Radiation Oncology Chang Gung Memorial Hospital-Kaohsiung Taiwan China Department of Surgery Chi Mei Foundation Hospital Taiwan China Department of Internal Medicine Veterans General Hospital-Kaohsiung Taiwan China Department of Pathology Veterans General Hospital-Kaohsiung Taiwan China

AIM: To investigate the clinical and pathological significance of altered retinoblastoma (Rb) encoding protein (pRb) in gastric carcinoma. METHODS: Expression of altered pRb was analyzed in 91 patients with gastric adenocarcinoma by immunohistochemistry. RESULTS: Sixty-five percent (59/91) of the tumors were positively stained and the staining in tumor nuclei of gastric carcinoma ranged 0%-90%. Moreover, strong expression of altered pRb was found in 35% (6/17), 24% (5/21), 17% (8/46) and 0% (0/7) of T1, T2, T3 and T4 gastric carcinomas, respectively. altered pRb expression was inversely correlated with the depth of tumor invasion (P = 0.047). Degree of immunoreactivity had no significant correlation with tumor grade, node metastasis and distant metastasis. In terms of prognostic significance, univariate analysis showed that poor differentiation [41 (66.1%) vs 34 (42.5%) P = 0.051], advanced tumor stage (P < 0.001) and weakly altered pRb expression [17 (80.5%) vs 58 (49.6%) P = 0.044] were associated with worse prognosis in these patients. However, multivariate analysis revealed that advanced tumor stage was the only independent poor prognostic factor (P < 0.001). CONCLUSION: The mutation of Rb gene is frequent in gastric carcinoma. The expression of altered pRb inversely correlates with tumor invasion and is not an independent prognostic marker in gastric adenocarcinoma.

关键词： Gastric adenocarcinoma Altered retinoblastoma protein Immunohlstochemistry

Measuring the orbital periods of low mass X-ray binaries in the X-ray band

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Research in Astronomy and Astrophysics 2014年第11期14卷 1367-1382页

作者： Yi chou Graduate Institute of Astronomy National Central University

A low mass X-ray binary （LMXB） contains either a neutron star or a black hole accreting materials from its low mass companion star. It is one of the primary astrophysical sources for studying stellar-mass compact objects and accreting phe- nomena. As with other binary systems, the most important parameter of an LMXB is the orbital period, which allows us to learn about the nature of the binary system and constrain the properties of the system＇s components, including the compact ob- ject. As a result, measuring the orbital periods of LMXBs is essential for investigating these systems even though fewer than half of them have known orbital periods. This article introduces the different methods for measuring the orbital periods in the X-ray band and reviews their application to various types of LMXBs, such as eclipsing and dipping sources, as well as pulsar LMXBs.

关键词： X-rays: binaries -- binaries: close -- methods: data analysis