• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2006년도 춘계학술대회 논문집
• /
• pp.563-564
• /
• 2006

In silicon wafer manufacturing process, the grinding process has been adopted to improve the flatness of water. The grinding of wafer is usually used by the infeed grinding machine. Grinding conditions are spindle speed, feed speed, rotation speed, grinding stone etc. But grinding condition selection and analysis is so difficult in grinding machine. In the intelligent grinding system based on knowledge many researchers have studied expert system, neural network, fuzzy etc. In this paper we deal grinding condition selection method, Taguchi method and Genetic Analysis.

• 한국군사과학기술학회지
• /
• 제13권3호
• /
• pp.503-510
• /
• 2010

The quick variation of the canister wall temperature causes the modification of the shape of canister wall. This paper is the possibility of adoption and the error analysis about the transient heat flux method. The commercial code(Fluent Ver6.2.16) was employed for the calculation of surface temperature in the case of steady and unsteady heat flux condition. Based the surface temperature variation and surface material property, transient heat flux method can calculate the surface heat flux. In the case of steady heat flux condition, the error is about 2%, and in the case of unsteady heat flux condition, the error is about 3.6%. With the unsteady heat flux condition, the time which reach the maximum surface heat flux is almost same between the numerical analysis and transient heat flux method.

• 연구논문집
• /
• 통권22호
• /
• pp.65-74
• /
• 1992

This paper aims at calculating optimum design dimensions to minimize the weight satisfied strain and stress intensity of the frame while loading maximum weight into a mechanical press in the static condition. Analysis of the frame was carried out by using the FEM, then the optimum condition was obtained by using these data. As modeling in the finite element analysis has great impact on the reliablity of analysis results, the analyzed object was selected a 150-ton mechanical press of J Company, the part little affected to structural rigidity was simplified, the load condition was considered in the only maximum load, the boundary condition was used by giving symmetric displacement due to symmetric boundary condition, the finite element was applied a linear membrane element. An intermediate processor program applied the normal ANSYS to analyze finite elements was developed, and the design sensitivity was calculated. This program was applied to the optimum design.

• 한국수학사학회지
• /
• 제22권1호
• /
• pp.75-88
• /
• 2009

본 연구는 수학적 지식의 발견과 정당화에서 분석의 역할을 논하고 학교수학에서 역할을 논의하고 있다.

• 한국압력기기공학회 논문집
• /
• 제8권1호
• /
• pp.19-24
• /
• 2012

This paper presents the results of finite element analysis for the effects of hydrostatic test and operating condition on the weld residual stress at dissimilar metal weld of a pressurizer safety nozzle in a nuclear power plant. For the study, the weld residual stress at ambient condition was analyzed using ABAQUS in the first place. After the weld residual stress analysis, the hydrostatic test condition and operating condition was applied to the same model one after another. The weld residual stress was observed to change due to the successive hydrostatic test and operating condition. The axial residual stresses on inner surface of the dissimilar metal weld and HAZ region were decreased by hydrostatic test and operating condition, which gives beneficial effect on preventing primary water stress corrosion cracking.

• Smart Structures and Systems
• /
• 제15권3호
• /
• pp.751-767
• /
• 2015

A new procedure is proposed for assessing probabilistic condition of structures considering effect of measured data uncertainty. In this procedure, multiple Finite Element (FE) models are identified by using weighting vectors that represent the uncertainty conditions of measured data. The distribution of structural parameters is analysed using a Principal Component Analysis (PCA) in relation to uncertainty conditions, and the identified models are classified into groups according to their similarity by using a K-means method. The condition of a structure is then assessed probabilistically using FE models in the classified groups, each of which represents specific uncertainty condition of measured data. Yeondae bridge, a steel-box girder expressway bridge in Korea, is used as an illustrative example. Probabilistic condition of the bridge is evaluated by the distribution of load rating factors obtained using multiple FE models. The numerical example shows that the proposed method can quantify uncertainty of measured data and subsequently evaluate efficiently the probabilistic condition of bridges.

• 한국관광식음료학회지:관광식음료경영연구
• /
• 제16권2호
• /
• pp.153-173
• /
• 2005

The purpose of a study was the present condition comparative analysis by the case of Bakery in Hotels. The sample was selected first grade hotels in seoul. The method of research was In-depth interview. The questionee were mamagers and chefs each hotel bakery. Interview was accomplished average 45minutes. The period of the research was from 1th of Februrary, 2002 to 28th of February, 2002. The survay was composed of product operation, employee operation, equipment operation, customer operation, sales and bakery characteristics. the data was analyized by SPSS10.0 mean, maximum value and minimum value were salected. Recently, as it is getting higher of importance of bakery in the food service market and many major companies run into a bakery industry, the researches about bakery have advanced, however in fact, materials or researches about hotel bakery are fewer than franchise, in-store bakery and mass production enterprise. Especially, each hotel exchanges their information through benchmarking but data analysis - accurate materials, sales, the present condition equipment is not easy to perform. The purpose of this study was to be helpful for studying hotel bakery for others by analysis. The data was analyzed by each hotel characteristics, employee, equipment, sales, productions and the present condition sales.

• 한국관광식음료학회:학술대회논문집
• /
• 한국관광식음료학회 2005년도 학술논문발표집
• /
• pp.92-108
• /
• 2005

The purpose of a study was the present condition comparative analysis by the case of Bakery in Hotels. The sample was selected first grade hotels in seoul. The method of research was In-depth interview. The questionee were mamagers and chefs each hotel bakery. Interview was accomplished average 45minutes. The period of the research was from 1th of Februrary, 2002 to 28th of February, 2002. The survay was composed of product operation, employee operation, equipment operation, customer operation, sales and bakery characteristics. the data was analyized by SPSS10.0 mean, maximum value and minimum value were salected. Recently, as it is getting higher of importance of bakery in the food service market and many major companies run into a bakery industry, the researches about bakery have advanced, however in fact, materials or researches about hotel bakery are fewer than franchise. in-store bakery and mass production enterprise. Especially, each hotel exchanges their information through benchmarking but data analysis - accurate materials, sales, the present condition equipment is not easy to perform. The purpose of this study was to be helpful for studying hotel bakery for others by analysis. The data was analyzed by each hotel characteristics, employee, equipment, sales, productions and the present condition sales.

• 한국환경과학회지
• /
• 제14권6호
• /
• pp.533-542
• /
• 2005

In this study, an optimization technique was developed from the application of Allocation Rule. Average Allocation coefficients of the Andong and Imha dam compare constant water supply condition with vary water supply condition that are above the contribute ratio $67\%\~50\%$ the Andong dam in Rule(A)-Rule(C). In the Refill Season, Andong dam water supply contribution is higher than Imha dam at the Control point water supply. In the Allocation analysis results, Rule(A) is calculated storage ratio because Andong dam contribute to Control point larger than Imha dam which Andong dam storage is larger than Imha dam storage. Rule(B) calculated sum of the storage and inflow ratio for Andong dam and Imha dam, as Andong dam contribution is higher than Imha dam. Rule(C) calculated that sum of storage, inflow and water supply is divided average storage ratio, as the best results of the Allocation coefficients and water supply capacity. The results of storage analysis is larger vary water supply condition than constant water supply condition and the results of water supply analysis is larger vary water supply condition than constant water supply condition. Water supply deficit is decrease $30\%$ for vary water supply condition.

• 한국공작기계학회논문집
• /
• 제14권2호
• /
• pp.62-68
• /
• 2005

The objective of this study is structural analysis and modal analysis of treadmill roller. A 3D finite element model is implemented to calculate the stress, strain and natural frequency for treadmill roller In order to analyses treadmill roller, many variables such as load condition, boundary condition, weight condition and resonance are considered. Natural frequency of treadmill is compare to motor revolution.