Distributed Systems and Turing Net

De Shen 대한전자공학회 1987 TENCON 87 - Computers and Communications Technolog Vol.- No.-

CCTV 사이트를 위한 통합관리시스템의 설계 및 구현

범생덕(Shen-De Fan),차영욱(Young-Wook Cha),김춘희(Choon-Hee Kim) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.10

To minimize service suspension of CCTV site’s equipments and dispatch of maintenance personnels, it is required to introduce integrated management of configuration, fault, and power using intelligent power distribution unit. In this paper, we proposed web service based R4CSM(RESTful web service for CCTV Site Management)-API instead of SNMP with some restrictions for integrated management of CCTV sites. Through R4CSM-API, we designed and implemented integrated management system for CCTV sites, and analyzed message processing time according to thread structures. To check out integrated management system’s validation procedure for R4CSM-API’s URL and XML information, we made use of RESTClient, which is a kind of testing tool for RESTful web service.

Time-Dependent Optimal Heater Control Using Analytic and Numerical Methods

Yun-De Shen,Zhen-Zhe Li,Dong-Ji Xuan,Kwang-Su Heo,Seoung-Yun Seol 한국정밀공학회 2010 International Journal of Precision Engineering and Vol.11 No.1

Thermoforming is one of the most versatile and economical processes to produce polymer products. The drawback of thermoforming is difficult to control thickness of final products. Temperature distribution affects the thickness distribution of final products, but temperature difference between surface and center of the sheet is difficult to be decreased because of low thermal conductivity of ABS material. In the first step, it was found out that timedependent variation of heat affects to the temperature difference between surface and center. An analytic solution was studied because the optimization time is remarkably large when optimal design is directly carried out using the analysis code developed in a previous study. Duhamel’s Theorem was used in order to solve a one-dimensional heat conduction with a time-dependent boundary condition when neglecting the effect of natural convection, but the analytic solution was difficult to be applied when the boundary condition is complicate or noncontinuous. In the following step, an optimal heating profile expressed by exponential function was recommended from 8 simple optimal cases using Duhamel’s Theorem, but the analysis results show that the effect of natural convection must be considered under the condition of setting the heat fluxes as suitable values. In order to consider the effect of natural convection with suitable heat inputs, Finite Difference Method was used. Through investigation, the optimal results using Finite Difference Method show that the temperature difference between surface and center of the sheet can be remarkably minimized with satisfying Temperature of Forming Window.

Refining and Validating a Two-stage and Web-based Cancer Risk Assessment Tool for Village Doctors in China

Shen, Xing-Rong,Chai, Jing,Feng, Rui,Liu, Tong-Zhu,Tong, Gui-Xian,Cheng, Jing,Li, Kai-Chun,Xie, Shao-Yu,Shi, Yong,Wang, De-Bin Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24

The big gap between efficacy of population level prevention and expectations due to heterogeneity and complexity of cancer etiologic factors calls for selective yet personalized interventions based on effective risk assessment. This paper documents our research protocol aimed at refining and validating a two-stage and web-based cancer risk assessment tool, from a tentative one in use by an ongoing project, capable of identifying individuals at elevated risk for one or more types of the 80% leading cancers in rural China with adequate sensitivity and specificity and featuring low cost, easy application and cultural and technical sensitivity for farmers and village doctors. The protocol adopted a modified population-based case control design using 72, 000 non-patients as controls, 2, 200 cancer patients as cases, and another 600 patients as cases for external validation. Factors taken into account comprised 8 domains including diet and nutrition, risk behaviors, family history, precancerous diseases, related medical procedures, exposure to environment hazards, mood and feelings, physical activities and anthropologic and biologic factors. Modeling stresses explored various methodologies like empirical analysis, logistic regression, neuro-network analysis, decision theory and both internal and external validation using concordance statistics, predictive values, etc..

Modeling Age-specific Cancer Incidences Using Logistic Growth Equations: Implications for Data Collection

Shen, Xing-Rong,Feng, Rui,Chai, Jing,Cheng, Jing,Wang, De-Bin Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.22

Large scale secular registry or surveillance systems have been accumulating vast data that allow mathematical modeling of cancer incidence and mortality rates. Most contemporary models in this regard use time series and APC (age-period-cohort) methods and focus primarily on predicting or analyzing cancer epidemiology with little attention being paid to implications for designing cancer registry, surveillance or evaluation initiatives. This research models age-specific cancer incidence rates using logistic growth equations and explores their performance under different scenarios of data completeness in the hope of deriving clues for reshaping relevant data collection. The study used China Cancer Registry Report 2012 as the data source. It employed 3-parameter logistic growth equations and modeled the age-specific incidence rates of all and the top 10 cancers presented in the registry report. The study performed 3 types of modeling, namely full age-span by fitting, multiple 5-year-segment fitting and single-segment fitting. Measurement of model performance adopted adjusted goodness of fit that combines sum of squred residuals and relative errors. Both model simulation and performance evalation utilized self-developed algorithms programed using C# languade and MS Visual Studio 2008. For models built upon full age-span data, predicted age-specific cancer incidence rates fitted very well with observed values for most (except cervical and breast) cancers with estimated goodness of fit (Rs) being over 0.96. When a given cancer is concerned, the R valuae of the logistic growth model derived using observed data from urban residents was greater than or at least equal to that of the same model built on data from rural people. For models based on multiple-5-year-segment data, the Rs remained fairly high (over 0.89) until 3-fourths of the data segments were excluded. For models using a fixed length single-segment of observed data, the older the age covered by the corresponding data segment, the higher the resulting Rs. Logistic growth models describe age-specific incidence rates perfectly for most cancers and may be used to inform data collection for purposes of monitoring and analyzing cancer epidemic. Helped by appropriate logistic growth equations, the work vomume of contemporary data collection, e.g., cancer registry and surveilance systems, may be reduced substantially.

Response Modification Factor and Displacement Amplification Factor of Y-Shaped Eccentrically Braced High-Strength Steel Frames

Li Shen,Li Rong-Rong,Wang De-Fa,Pan Xiu-Zhen,Guo Hong-Chao 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5

A Y-shaped eccentrically braced high-strength steel frame is a novel structure. For such structure to exhibit good plastic deformation ability under severe earthquake, the links are made of ordinary steel ( f y ≤ 345 MPa), whereas high-strength steel ( f y ≥ 460 MPa) is used in the frame beam and column to reduce the cross section while ensuring the elasticity of the non-energy consuming component. The new structure has good ductility and energy-dissipating capacity. The response modifi cation factor R is crucial to the performance-based seismic design. For an appropriate and economical seismic design, the R value should be reasonably selected. In the 2016 edition of China's code for Seismic Design of Buildings (GB50011- 2010), it is obviously not reasonable to hide the R concept and adopt a constant value for all structural systems. It is important to study R and C d of a Y-shaped eccentrically braced high-strength steel frame, it can not only improve the structural performance design, but also provide reference for the future, and promotes the application of the structure in seismic areas, which presents excellent seismic performance. Therefore, in this study, structures with diff erent stories (4, 8, 12, and 16 stories) and link lengths (700, 900, and 1100 mm) were designed via the performance-based seismic design method. A static elastic–plastic analysis (Pushover analysis) and an incremental dynamic analysis (IDA) were conducted and the data thus obtained was fi tted to reach the IDA performance curve of the structure. The R and C d value of each prototype were calculated using the capability spectrum method, the number of structural story N and the link length e is considered. The results of the pushover analysis and IDA were compared; the values of each performance coeffi cient obtained can serve as a reference for the performance design of the new structural systems in the future.

An Automatic Assembly Control Method for Peg and Hole based on Multidimensional Micro Forces and Torques

Fei Shen,Zheng-Tao Zhang,De Xu,Juan Zhang,Wenrong Wu 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.8

In this paper, an automatic assembly method for peg and hole based on multidimensional micro forces and torques is developed for satisfying the accurate and lossless assembly requirements. The relationship between the forces and torques from the force sensor and the attitudes deviation of peg and hole is discussed. Moreover, a novel method based on active constraint state for estimating the deviation angles between the peg and the hole through the toques exerted on the sensor is proposed. To achieve automated insertion and minimize the contact forces and torques in the meanwhile during the insertion process, a control strategy for controlling contact forces and torques is proposed by eliminating the position and attitudes deviation interactively. Related assembly experiments are conducted to verify the effectiveness of the proposed approaches.

Spin Transport in Ge at Room Temperature

C. Shen,T. Trypiniotis,K. Y. Lee,S. N. Holmes,R. Mansell,M. K. Husain,V. Shah,H. Kurebayashi,I. Farrer,K. de Groot,D. R. Leadley,G. Bell,E. H. Parker,T. Whall,D. A. Ritchie,C. H. W. Barnes 한국자기학회 2010 한국자기학회 학술연구발표회 논문개요집 Vol.2010 No.12

Fire Behaviors of Multilayer Latex Foam Coated by Thin Surface Fabric under Bottom Ventilation Conditions

Yiming Shen,Kai Zhang,Dongmei Huang,Chaoyi Wang,Chen Chen,De Li,Long Shi 한국고분자학회 2021 폴리머 Vol.45 No.1

The latex mattress is usually accompanied by fire risk due to its coating material and multi-layer structure. The fire behaviors of multi-layer (with a total thickness of 5 cm) latex foam coated with different fabric layer under bottom ventilation conditions were investigated experimentally. Experimental results showed that fabric coated on the surface of the multi-layer sample could significantly affect the fire behaviors. The combustion duration and peak mass loss rate of single layer sample were obtained 30% shorter and 25% larger than that of the coated samples, respectively. The effects of blending coated from the latex foam surface on the fire behaviors were found larger than those from the cotton coated sample. The total combustion duration and average fuel regression rate of cotton coated samples reduced by 34%, 43.2% when compared to those of the blending coated samples, respectively. With the increase of the number of latex foam layers, the fuel regression rate in the depth direction of the sample increases.

Optimal design of high temperature vacuum furnace using response surface method

이진철,Yun-De Shen,Hui-Lan Xu,이재우,호광수,설승윤 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.11

A new method using the response surface method and optimization technique has been developed instead of the original method based on trial and error. In order to construct a response surface, thermal analysis was performed under the condition of using the calculated thermal conductivity of the insulator in a previous study. In order to set up the response surface, the D-Optimal method was used in the process of selecting experimental points. Using a weighting factor, an optimization study was carried out under the condition of satisfying user requirements. Finally, the merits and drawbacks of the new method were described by comparing with the optimal design method based on the thermal analysis database which was developed in a previous study. The optimal results show that the developed method can be used to design an energy efficient, low manufacturing cost, high temperature vacuum furnace with avoiding unnecessary iterative manufacturing, and anticipating the performance before manufacturing.