• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.05a
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• pp.437-441
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• 2004

Recently, as the power capability of satellites increase, we need to develop a new SAR(Solar Array Regulator) with much higher power capacity whenever we design a power system of a new satelite. In this case, modular design method could be a good solution for this kind of problem. But when we use a modular method in the design of the parallelled converter, it is very important to share current equally between each module connected in paralled. In this paper, we study how to design the optimum current control-loop and voltage control-loop when we apply average current-mode control method to the parallel SAR. With the design results, we make a protype of the 3-module paralleling SAR and verify its performances.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.11
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• pp.21-31
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• 1998

This study described computer aided die design system for cold forging of non-axisymmetric parts. To design the die of cold forging. an integrated approach based on a rule-base system and commercial F. E. code were adopted. This system is implemented on the personal computer and its environment is a commercial CAD package named as AutoCAD. The system includes four modules. In the initial data input module, the variables which are necessary to design of die are inputted by user and die material are selected from the database. In the analysis and redesign module, stress distrubution action on the designed die is analyzed by commercial FEM code NISA II. The designed die is modified to prevent failure in both states of stress free and pressurizing. The developed system provides powerful capabilities for die design of non-axisymmetric parts.

• Journal of the Korean Society of Mechanical Technology
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• v.20 no.6
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• pp.803-808
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• 2018

Combining digital automation solutions throughout recent manufacturing process is essential. Advanced robot and mechanical techniques are required for design, manufacture, and distribution process. Manual design of repetitive similar mechanical components during the development phase of these advanced machines and robots can occur wasting time and money. Developed gear design module, which is the power transfer system mechanical component, was programmed in the Visual Basic language in CATIA V5 environment. Automation Process is Based on Parametric Modeling Method. and it was found to be effective in reducing design time compared to designers manual modeling.

• The Journal of the Korea Contents Association
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• v.13 no.12
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• pp.650-658
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• 2013

In modern society, we live in the important age which should reflect needs of residents enough with the economic growth. Desire in the public sector means the basic requirements which are necessary for contemporary men who live in social life and is very important even at the social welfare policy level. Each local government is recently increasing convenience of residents by installing the facilities about public design and is politically promoting expansion of public services to satisfy their public desire. This public design should be installed to make reasonable plans and maintenance be smoothly done. This paper tries to study the present condition and the precedent studies targeting public interest facilities which will be installed in neighborhood parks of urban areas, grasp design problems of public facilities which will be installed in neighborhood space by clarifying the concept of design, and apply them by designing them newly. It tries to examine reasonable maintenance direction related to next development of public design by suggesting design direction for this practical development and module assembly typed design that storage, assembly, and management of public facilities are convenient and suggest cases of design development which can reflect them in public design development policies.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.234-236
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• 2004

Transmission control protocol(TCP) is protocol used in internet. TCP is seldom transmission error and is protocol based on wire environment. TCP uses 3 way handshake ways, data transmission control through windows size, data transmission control through reception confirmation, sliding window for packet delivery. In this study, designed TCP packet ion module for analyze the TCP segments & correct information about TCP. TCP capture in internet using designed TCP module and analysed TCP segments composition. Through this, could analyze the correct information of protocol in network.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.1025-1028
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• 1998

Hardware to implement the parallelized Floating-point rounding algorithm is described. For parallelized additions, we propose an addition module which has carry selection logic to generate two results accoring to the input valuse. A multiplication module for parallelized multiplications is also proposed to generate Sum and Carry bits as intermediate results. Since these modules process data in IEEE standard Floatingpoint double precision format, they are designed for 53-bit significands including hidden bits. Multiplication module is designed with a Booth multiplier and an array multiplier.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1998.10a
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• pp.623-635
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• 1998

이 논문에서 우리는 분산 실시간 소프트웨어 설계방법인 CODARTS/DA(Concurrent Design Approach for Real-Time Systems/Distributed Application)를 위한 타스크 행위 명세방법을 제안한다. 각 타스크는 CODARTS/DA 모듈들, 즉, 다수 클라이언트/서버 모듈(Multiple Client/Sever Module), 단일 클라이언트/서버 모듈(Single Client/Server Module), 그룹 통신모듈(Group Comm. Module), 우선 순위 모듈등과 통신을 수행하는데, 분산환경의 동기, 비동기 문제들을 제안한 방법으로 설계 명세할 수 있다. 또한 제안된 명세방법은 C언어와 비슷한 문법구조를 제공하므로 쉽게 문서들이 구조적 프로그램으로 변환될 수있다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.853-855
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• 2002

안전한 운영체제(Secure Operating System)는 컴퓨터 운영체제의 보안상 결함으로 인하여 발생 가능한 각종 해킹으로부터 시스템을 보호하기 위하여 기존의 운영체제 내에 보안 기능을 통합시킨 보안 커널(Security Kernel)을 추가로 이식한 운영체제이다. 본 논문에서는 polaris 8에서 동작하는 보안 커널을 설계하기 위해 안전한 운영체제와 보안 커널 개발 기술, 솔라리스 운영체제 및 커널 기술을 살펴본다. 이를 토대로 RBAC(Role-Based Access Control)을 지원하고 시스템의 취약점을 감시하는 Solaris 8 기반의 보안 강화용 LKM(Loadable Kernel Module)을 설계한다.

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.817-820
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• 1999

In this paper, we describes RF receiver module for IMT-2000 handset with 5MHz channel bandwidth. The fabricated RF receiver module consists of Low Noise Amplifier-, RF SAW filter, Down-converter, IF SAW filter, AGC and PLL Synthesizer. The NF and IIP3 of LNA is 0.8㏈, 3㏈m at 2.14㎓, conversion gain of downconverter is l0㏈, dynamic range of AGC is 80㏈, and phase noise of PLL is -100 ㏈m, at 100KHz. The receiver sensitivity is -110㏈m, adjacent channel selectivity is -48㏈m.

• Journal of the Korea Computer Industry Society
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• v.10 no.3
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• pp.73-78
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• 2009

This paper designed Object-orientid Meta_data operation module that introducted new Meta_class basis the Meta_Classfication model. In order to implement this Data model, we have introducted heurilistic class to traditional object-orinted database. And we designed Meta_data operation module for Inplemetated Meta_data that basis on the heurilistic classficasion model using stored Meta_data in extened object-oriend data model.