• 한국전산유체공학회지
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• 제11권2호
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• pp.32-39
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• 2006

A heat dissipation modeling method of EEE parts is developed for thermal design and analysis of an satellite electronic equipment. The power consumption measurement value of each functional breadboard is used for the heat dissipation modeling method. For the purpose of conduction heat transfer modeling of EEE parts, surface heat model using very thin ignorable thermal plates is considered instead of conventional lumped capacity nodes. These modeling methods are applied to the thermal design and analysis of CTU EM and EQM and verified by thermal cycling and vacuum tests.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1997년도 추계학술대회논문집; 한국과학기술회관; 6 Nov. 1997
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• pp.385-390
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• 1997

In recent years there has been an increasing emphasis on shortening design cycles for bringing products to market. This requires the development of computer aided engineering tools which allow analysts to quickly evaluate the effect of design changes on noise, vibration, and harshness. Statistical Energy Analysis (SEA) modeling is a valuable tool for predicting noise and vibration as SEA models are inherently simpler and more robust than deterministic models. SEA modeling can be combined with design sensitivity analysis (DSA) to identify design changes which give the largest performance benefit. This paper describes SEA modeling of an equipment cab. SEA predictions are compared to test data, showing good agreement. The use of design sensitivity analysis in improving cab design is then demonstrated.

• 복식문화연구
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• 제31권1호
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• pp.53-69
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• 2023

This study aims to analyze research trends regarding outdoor wear. For this purpose, the data-collection period was limited to January 2002-October 2022, and the collection consisted of titles of papers, academic names, abstracts, and publication years from the Research Information Sharing Service (RISS). Frequency analysis was conducted on 227 papers in total to check academic journals and annual trends, and LDA topic-modeling analysis was conducted using 20,964 tokens. Data pre-processing was performed prior to topic-modeling analysis; after that, topic-modeling analysis, core topic derivation, and visualization were performed using a Python algorithm. A total of eight topics were obtained from the comprehensive analysis: experiential marketing and lifestyle, property and evaluation of outdoor wear, design and patterns of outdoor wear, outdoor-wear purchase behavior, color, designs and materials of outdoor wear, promotional strategies for outdoor wear, purchase intention and satisfaction depending on the brand image of outdoor wear, differences in outdoor wear preferences by consumer group. The results of topic-modeling analysis revealed that the topic, which includes a study on the design and material of outdoor wear and the pattern of jackets related to the overall shape, was the highest at 30.9% of the total topics. The next highest topic was also the design and color of outdoor wear, indicating that design-related research was the main research topic in outdoor wear research. It is hoped that analyzing outdoor wear research will help comprehend the research conducted thus far and reveal future directions.

• 한국학교수학회논문집
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• 제25권2호
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• pp.125-148
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• 2022

본 연구의 목적은 International Baccalaureate Diploma Programme(이하 IBDP)의 수학 교과서와 우리나라 고등학교 수학 교과서의 함수 단원의 문제 중 모델링 문제의 수와 특징을 비교·분석하는데 있다. IBDP 교과서 3종과 우리나라 교과서 9종 선택한 후 이원분류법을 사용하여 교과서의 모든 문제를 실세계 문제와 그렇지 않은 문제로 분류한 후 실세계 문제는 수학적 모델 설정의 필요성에 따라 문장제와 모델링 문제로 분류한 다음 모델링 문제는 일반적 응용문제와 적절한 모델링 문제로 분류하였다. 12 종의 교과서 중 모델링 문제를 가장 많이 포함한 교과서는 IBDP의 '수학: 응용과 해석 HL' 교과서로 전체 문제대비 50.41%의 모델링 문제 비율을 나타내었다. 이 교과서는 2%에서 9% 사이의 모델링 문제 비율 분포를 보인 다른 교과서에 비해 학습자들에게 현저히 높은 모델링 기회를 제공하였다. 수학적 모델링의 6가지 하위 행동 요소 중 '수학적 분석' 요소와 '해석과 결과에 대한 분석' 요소는 모델링 문항 수와 매우 유사한 정도로 가장 많이 나타났으며 '수학화' 요소가 뒤를 이었다. 위의 연구 결과로 모델링 문제들에 대한 분석을 통해 각 교과서에서 등장하는 모델링 문제의 수와 비율에 대한 비교와 모델링 문제에서 어떠한 모델링 하위행동요소가 어느 정도로 나타나는지에 대한 이해에 도움을 줄 수 있을 것으로 기대한다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1991년도 춘계공동학술대회 발표논문 및 초록집; 전북대학교, 전주; 26-27 Apr. 1991
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• pp.469-474
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• 1991

Recent interests in intelligent LP modeling aim to support MS/OR-naive users to be able to apply LP models to practical problems without the expert knowledges required. For more generalized LP modeling, a GPS(General Problem Solver)-based approach is suggested in this paper. It identifies modeling process as a means-ends analysis process. In view of this approach, a) we first divide the knowledges into domain specific assertive knowledges(state) and procedural knowledges about LP modeling(operator and macro) for model-domain independence, b) and then generate LP model according to the difference resolution techniques.

• Journal of Magnetics
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• 제16권4호
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• pp.386-390
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• 2011

This paper deals with the magnetic equivalent circuit modeling and permanent magnet (PM) performance evaluations of a pole changing memory motor (PCMM). We use a coupled transient finite element method (FEM) and Preisach modeling, which is presented to analyze the magnetic characteristics of the permanent magnets. The focus of this paper is on the evaluation of characteristics such as the magnetizing direction and the pole number of the machine under re- and de-magnetization conditions.

• 한국BIM학회 논문집
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• 제3권3호
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• pp.19-28
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• 2013

In Korea highway bridges, most piers are the type of one-column or multi-column ones. So, in this study, under an environment applying BIM so fast, to activate researches on two-column piers subjected to bidirectional seismic loading, a 3D parametric modeling method was selected when the model of two-column piers and one-column piers were formed. Also, interface module between input data in structural analysis and 3D model of RC pier was developed. The module can create the input data for non-linear structural analysis like material, geometric properties and additional coefficients.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 춘계학술대회 논문집
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• pp.382-387
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• 2003

This research has investigated structural characteristics of curved two girder bridges proposed for AGT system and analyzed the results of the structural analysis of three different modelings for 3 span continuous bridge, each modeled in grillage modeling, simplified 3D modeling, and detailed 3D modeling respectively. The grillage modeling appeared to be somewhat underestimated in deflection and overestimated in rotation with respect to 3D modelings. Also, it is impossible to make a detailed examination of local buckling and details of cross beams, etc. The point that warping effect cannot be considered may cause the structural analysis unsafe, accordingly the structural analysis of curved two girder bridges should be done with 3D modelings.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제8권1호
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• pp.13-18
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• 2019

본 연구는 커뮤니케이션이 활발한 SNS 속에서 사회적 이슈가 어떤 주제별로 나뉘어져 있고, 어떤 키워드들이 유기적으로 연결되었는지 그 연결 관계를 알아보고자 하였다. '미투'라는 새로운 단어가 생겨남과 동시에 큰 운동으로 번지고 있는 '미투운동'을 사회적 이슈로 간주하였고, 여러 SNS 중 특히 실시간 소통이 가장 활발한 트위터를 중심으로 분석을 실시하였다. 우선 키워드를 '미투'로 하여 관련된 키워드를 각 날짜별로 추출하였고, 주요 키워드를 파악한 후 토픽 모델링을 수행하였다. 이를 통해 사회적 이슈를 둘러싼 키워드들이 시간의 흐름에 따라 어떻게 변화하였는지 파악하고, 각 토픽 내의 키워드를 종합하여 토픽별 사회적 이슈의 다양한 관점을 해석하였다.

• 마이크로전자및패키징학회지
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• 제20권4호
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• pp.75-79
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• 2013

A power distribution network (PDN) is a network that provides connection between the voltage source supply and the power/ground terminals of a microprocessor chip. It consists of a voltage regulator module, a printed circuit board, a package substrate, a microprocessor chip as well as decoupling capacitors. For power integrity analysis, the board and package layouts have to be transformed into an electrical network of resistor, inductor and capacitor components which may be expressed using the S-parameters models. This modeling process generally takes from several hours up to a few days for a complete board or package layout. When the board and package layouts change, they need to be re-extracted and the S-parameters models also need to be re-generated for power integrity assessment. This not only consumes a lot of resources such as time and manpower, the task of PDN modeling is also tedious and mundane. In this paper, a block-based PDN modeling is proposed. Here, the board or package layout is partitioned into sub-blocks and each of them is modeled independently. In the event of a change in power rails routing, only the affected sub-blocks will be reextracted and re-modeled. Simulation results show that the proposed block-based PDN modeling not only can save at least 75% of processing time but it can, at the same time, keep the modeling accuracy on par with the traditional PDN modeling methodology.