• Journal of Electrical Engineering and Technology
• /
• 제10권6호
• /
• pp.2288-2296
• /
• 2015

This paper proposes a novel systematic modeling approach for an integrated single-stage power converter in order to predict its dynamic characteristics. The basic strategy of the proposed modeling is substituting the internal converters with an equivalent current source, and then deriving the dynamic equations under a standalone operation using the state-space averaging technique. The proposed approach provides an intuitive modeling solution and simplified mathematical process with accurate dynamic prediction. The simulation and experimental results by using an integrated boost-flyback converter prototype provide verification consistent with theoretical expectations.

• 산업공학
• /
• 제16권2호
• /
• pp.258-267
• /
• 2003

Recently, virtual reality technologies have been rapidly developed and realtime virtual simulation methods have been extensively employed for several application areas such as game, sports, manufacturing, military, and so on. A 3D database in realtime virtual simulation plays a key role because it makes users feel reality in virtual space. In a application view of 3D database, a systematic construction approach is required to reduce its construction time and increase its quality. However, many researches have been mostly focused on realtime graphic issues and its key technologies. In virtual simulation of transportation equipments, this paper proposes a systematic construction process of 3D database consisting of four stages as follows: 1) determine the activity space of a equipment, 2) collect data related to 3D database construction, 3) make a 3-dimensional modeling strategy, and 4) generate and evaluate a 3D model. This paper also introduces a new procedure of 3D environment modeling, which summarizes and expands our modeling experiences, to be used as a modeling guide.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1997년도 추계학술대회 논문집
• /
• pp.647-650
• /
• 1997

A complete dome structure is based on a basic dome modeling, and the basic dome modeling affects safety of the dome structure. In other to save the manufacture expenses, an optimum shape modeling of a dome structure is necessary work of before manufacture of the dome. In this study, modeling of the triangle optimum shape in the surface of an aluminum dome is more focused to optimize shape of the dome and save manufacture expenses. After being made the systematic procedure of the basic modeling, the programming work of the procedure is performed. The program is made by C language, and the trust of the program is proved by comparison between output data of the program and basic modeling in PATRAN.

• International Journal of Computer Science & Network Security
• /
• 제23권6호
• /
• pp.1-12
• /
• 2023

With the rapid increase of user generated data on digital platforms, the task of categorizing and classifying theses huge data has become difficult. Topic modeling is an unsupervised machine learning technique that can be used to get a summary from a large collection of documents. Topic modeling has been widely used in English content, yet the application of topic modeling in Arabic language is limited. Therefore, the aim of this paper is to provide a systematic review of the application of topic modeling algorithms in Arabic content. Using a well-known and trusted databases including ScienceDirect, IEEE Xplore, Springer Link, and Google Scholar. Considering the publication date from 2012 to 2022, we got 60 papers. After refining the papers based on predefined criteria, we resulted in 32 papers. Our result show that unfortunately the application of topic modeling techniques in Arabic content is limited.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
• /
• pp.488-492
• /
• 1991

This paper deals with modeling and scheduling for flexible manufacturing systems(FMS). In modeling extended Petri nets are used to describe various and complex properties. To resolve multiple conflict without predefined properties, such as part selection, machine selection, rule-based scheduling method is introduced. This structure have a capability of on-line scheduling with systematic modeling description.

• 한국주거학회논문집
• /
• 제8권3호
• /
• pp.163-175
• /
• 1997

This study is aimed at developing the systematic application of logic in composition of architectural space. It is investigated in the logical concept and its development applied to the rule of composition. Applying the method to the architectural composition. it is focused on modeling to the systematic approach in architectural composition. Therefore this study is investigated in the design process on the viewpoint of the systematic approach considering diverse variables. and it is accomplished to logical composition in architectural space. Being more studied. this method is applied to the composition of architect ureal space and practice.

• 한국학교수학회논문집
• /
• 제1권1호
• /
• pp.131-138
• /
• 1998

The aims of mathematical education are to improve uniformity and rigidity, and to apply to an information age which our society demands. One of the educational aims in the 6th educational curriculum emphasizes on the expansion of mathematical thought and utility, But, The change of contents in the text appears little. This means that mathematical teachers must actively develop the new types of problems. That the interests and concerns about mathematics lose the popularity and students recognize mathematics burdensome is the problems of not only teaching method, unrealistically given problems but abstractiveness and conceptions. Mathematical Modeling is classified exact model, almost exact theory based model and impressive model in accordance with the realistic situation and its equivalent degree of mathematical modeling. Mathematical Modeling is divided into normative model and descriptive model according to contributed roles of mathematics. The Modeling Applied Problems in the present text are exact model and stereotyped problems. That the expansion of mathematical thought in mathematics teaching fell into insignificance appears well in the result of evaluating students. For example, regardless of easy or hard problems, students tend to dislike the new types of mathematical problems which students can solve with simple thought and calculation. The ratings of the right answer tend to remarkably go down. If mathematical teachers entirely treat present situation, and social and scientific situation, students can expand the systematic thought and use the knowledge which is taught in the class. Through these abilities of solving problems, students can cultivate their general thought and systematic thought. So it is absolutely necessary for students to learn the Modeling Applied Problems.

• 정보기술과데이타베이스저널
• /
• 제6권2호
• /
• pp.45-57
• /
• 1999

This paper makes an attempt to find a systematic portion of the database design process, especially using the Entity-Relationship(E-R) model. Basically, we consider three aspects as a systematic portion of the database design process. They are, the strategy that a designer selects to design an E-R diagram, designer's cognitive style, and the knowledge and preference of the database designer. An experiment has been carried out in order to verify the systematic relationship between above-mentioned three aspects and the E-R modeling performance. The target system is a professional baseball system. A normative E-R diagram was constructed based upon 48 E-R diagrams produced during the experiment. The ANOVA process has been used to analyze the results. It has been found that there exist significant differences in query-answering capacity and the completeness of the E-R model among design methods. Individual differences in cognitive styles has not been found to be significantly related to the modeling performance.

• 한국멀티미디어학회논문지
• /
• 제11권4호
• /
• pp.525-543
• /
• 2008

최근 들어 소프트웨어 개발에 있어서 사용자 인터페이스가 차지하는 비중이 급증하고 있다. 이로 인해 스윙, MFC, Web 2.0 등과 같은 다양한 사용자 인터페이스 개발 관련 기술들이 소개되고 있다. 그러나 현재 대부분의 소프트웨어 개발에 있어서는 사용자 인터페이스 부분과 비즈니스 부분을 별도로 개발하는 프로세스로 진행되고 있다. 이로 인해 통합 과정에서의 어려움, 개발 기간의 연장, 개발 모델의 재사용성의 저하등과 같은 문제점들이 발생하고 있다. 즉, UI 모델링이 체계적이고 계층적이지 못하며, UI 모델링과 비즈니스 모델링간의 일관성있는 통합 기법을 제공치 않아, 구축 모델의 확장성과 재사용성의 저하를 초래하고 있다. 본 논문은 이를 해결하기 위해 개발 단계의 추상화 수준에 따른 계층적 메타모델을 사용해서 단일화되고 체계적인 UML 기반의 사용자 인터페이스 모델링 프로세스를 제시한다. 이를 위해, 개발의 성숙도에 준거하여 PIM/PSM으로 UI 모델의 모델링 요소를 계층화하여 메타모델을 제시한다. 3 단계 모델링(개념/명세/상세)에 의해 UI 및 비즈니스 메타모델을 적용해서 UI 모델링과 비즈니스 모델링이 통합된 계층적인 모델링 프로세스를 정립한다. 제시한 프로세스를 인터넷 쇼핑몰에 적용해 봄으로써 실효성을 제시한다. 실험 결과를 통해 계층적 UI 메타모델 및 프로세스가 체계적이고 계층적인 UI 모델을 구축할 수 있다. 이는 모델의 품질과 재 사용성을 향상시킬 수 있었다.

• 산업경영시스템학회지
• /
• 제29권3호
• /
• pp.119-127
• /
• 2006

In this paper, we present a systematic approach to translating BPML(Business Process Modeling Language) into the ${\pi}-Calculus$. BPML is an executable business process modeling language, like BPEL4WS(Business Process Execution Language for Web Services). It is difficult to find a systematic approach to formalizing these languages; but, by formalizing them, the behavior of the processes can be analyzed and compared so that optimal processes can be designed. For this formalization, we analyzed the activity types and contexts of BPML and suggested the definitions of semantics for each type and context by using the ${\pi}-Calculus$. In addition, we have shown the usefulness of our formalization scheme in that a typical order fulfillment process represented in BPML can be translated into the ${\pi}-Calculus$.