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청주지방(淸州地方)의 시청명지수(時淸明指數)와 산란비(散亂比)와의 관계(關係)(II)
이홍주,Lee, H.J. 한국농업기계학회 1988 바이오시스템공학 Vol.13 No.2
The estimation of beam radiation intensity on a tilted surface is very important to the design of a solar energy system. In order to get the beam radiation intensity, it is required to calculate the ratio of the diffuse solar radiation to the global radiation ($k_d$). The data measured at Chung-Buk National University. Cheong-ju, (from May 16, 1985 to Nov, 10, 1987) were analysed to define the relationship between hourly clearness index ($k_t$) and diffuse ratio ($t_d$). The results are is follow: 1. The percent of clearness index($k_t$) of less than 0.3 and of more than 0.8 were 2.7% and 3.1% respectively, and between 0.5 and 0.8 was 76.5%. 2. The regression equation between $k_t$ and $k_d$ was an exponential function as: $$k_d=\[{1\hspace{120}:\hspace{10}(k_t<0.1)\\1.28{\times}0.074^{k_t}\hspace{30}:\hspace{10}(0.1{\leq}=k_t<0.9)\\0.12\hspace{98}:\hspace{10}(0.9{\leq}=k_t)$$ There was a little difference between the result. of this study based on the data of 30 months and the results of previous study (ITRA 2(1):42-47, 1986.) based on the data of 8 months. 3. The hourly exponential regression equation between $k_t$ and $k_d$ was $k_d=A{\times}8^{k_t}$ and the values of constant A and coefficient B of the: equations are as the following table; 4. The percent of $k_d$ of less than 0.4 was 72.9% and of more than 0.7 was 6.6%. 5. Total mean value of $k_t$ and $k_d$ wert 0.56 and 0.32, respectively. From 10:00 to 15:00 o'clock the total mean value of $k_t$ was smaller that the hourly man value of $k_t$ and the one or $k_d$ larger.
다이레스 CNC 포밍을 이용한 자동차용 브레이크 더스트 쉴드 시작품 제작
이홍주(H. J. Lee),강석호(S. H. Kang),염경섭(K. S. Yeom),강병수,왕덕현(D. H. Wang),강재관(J. K. Kang) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Manufacturing industry is changing rapidly. Prototyping with rapid manufacturing is a part of every business in many companies and prototypes are used efficiently as a part of the production development process. Sheet metal forming has traditionally been a technology area where prototyping has been extremely expensive and efficient options for low volume have been limited. This paper describes the process for incremental sheet forming technologies to make the prototype for a brake dust shield of vehicles, which includes the remodeling method to make a base mold and tool path for sheet metal forming and 5-axes laser cutting machine to trim the prototype product.
이주희(J H Lee),이홍주(H J. Lee),허용민(Y M Hur),박동규(D.G.Park),임인질(I C Lim) 한국정보과학회 1988 한국정보과학회 학술발표논문집 Vol.15 No.1
본 논문에서는 경로 대수를 이용한 MOS 회로의 개방과 단락고장 검출을 위한 테스트 생성방법을 제안 한다. 본 논문에서 제안한 방법은 R.I Damper등이 제안한 경로 대수 연산을 개선하여 필수적인 연산만을 수행하도록 함으로써 연산 수를 감소시키며, 또한 다단의 조합 논리 회로 테스트에 있어서 단일 고장만을 검출해 낼 수 있는 D-알고리즘에 비교하여, 경로와 컷?에 포함되는 모든 트랜지스터들의 테스트를 동시에 수행하도록 함으로써 테스트의 수를 줄인다.