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논리회로 시뮬레이터에 있어서 실행상태의 동적패턴 추출과 고속화
이필우(Lee Phil Woo),판야긍삼(Kozo Itano) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.8
This paper presents the methodology to improve the computation efficiency of the simulation by developing the concept of the dynamic preservation and reutilization of the state transitions. The computation cost is enormous for the simulation of hardware described in hardware description languages including VHDL. Analyzing the process of simulation precisely, we have found that the number of the patterns for the state transition is limited if the sizes of hardware modules are determined properly. The patterns are preserved dynamically when they appeared first, and are utilized in later simulation in order to reduce the simulation costs. In this study, the efficiency of the present method was verified using case studies for the simulation.
효소지수법에 (酵素指數法) 의한 목질판상재료의 연소시험
이필우(Phil Woo Lee),정인주(In Ju Chung) 한국산림과학회 1989 한국산림과학회지 Vol.78 No.4
The oxygen index test was carried out to obtain the relative flammability of wood-based materials (plywood, MDF, particleboard) and their oxygen indices. The oxygen index is the minimum concentration of oxygen, expressed as volume percent, in a mixture of oxygen and nitrogen that will just support flaming combustion of a material under the specified laboratory conditions. In this study the oxygen indices were calculated by using the Dixon and Massey`s Up and Down method($quot;N$quot; Large method). The obtained results were as follows : 1. The oxygen indices calculated with Up and Down method were 27.9% for plywood, 26.9% for MDF, and 26.2% for particleboard, indicative of plywood being more difficult to burn than MDF and particleboard Lender the same surrounding conditions. 2. The oxygen indices were not affected by the total gas flow rate.