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재사용 가능한 객체 식별을 위한 Two-Pass 추상화 원칙 제안
고형호(Hyungho Ko),김능회(Neunghoe Kim),이동현(Donghyun Lee),인 호(Hoh Peter In) 한국IT서비스학회 2009 한국IT서비스학회지 Vol.8 No.3
As the software development cycles is getting shorter, the software reusability is emphasized accordingly. Specifically, the design reusability is being recognized as one of the most important factor to increase the software quality and productivity and make the maintenance cost down. Two essential abilities are needed to improve the design reusability. One is the identification of the reusable objects, and the other is the organization of the relationships among the objects. However, the existing methods using such as a grammatical analysis, a scenario matching and a unit of design problems(design pattern) have not been proposed proper principles to identify the reusable objects on the basis of the abstraction which is the core of the object-oriented concept. In this paper, we will offer the Two-Pass abstraction principle based in the abstraction concept.
안정적 추력기 구동을 위한 Dual Modular Redundancy 구조 제안 및 구현
원주호(Joo Ho Won),고형호(Hyungho Ko) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
Electronics used for aerospace application use triple modular redundancy for reliable operation. In general TMR is automatically generated by CAD tools, such as synplify, supplied by FPGA provider. FPGA for aerospace is more expensive than commercial device, gate capacity is much lower, because of TMR. Thruster used for attitude and orbit control in satellite has to be controlled accurately because the space application can’t be fixed after the launch and the life time of satellite is limited by fuel for thruster. I proposed DMR logic implementation method to decrease the gate count for thruster control instead of TMR, and confirm the correct operation of that logic through behavioral level using C language, and VHDL. It is possible to implement the reliable propulsion thruster control using this proposed DMR logic.
원주호(Joo Ho Won),곽수영(Sooyeong Kwak),고형호(Hyungho Ko) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
Electronics used for aerospace application have to be complied to stringent requirement for reliable operation in harsh space environment during its own operational period. For Electronics used for spacecraft control, there is a strict operation constraints for both ON and OFF procedure in order to inhibit the stress for converter (CV) used in electronics. There are two relays for electronics, the one is located in the input for CV, and the other is located in the ouput for CV. This paper proposed the protection circuit for sequential procedure using FET. Using the FET characteristics, abnormal activation of relay can be inhibited, and according to the worst case analysis, proposed circuit is performed its own protection circuit correctly.