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張益洙 명지대학교 1974 明大論文集 Vol.7 No.-
I.C化의 發達에 依하여 Film에 의한 分布回路가 많이 연구 개발되었다. 本 論文에서는 단순한 R-C 分布回路와 Notch 回路를 合成하여서 차단주파수보다 낮은 주파수에서는 通過 시키고, 차단주파수 보다 높은 주파수에서는 R-C 分布回路에 의하여 대단히 큰 감쇄를 갖게 한다. 따라서 차단주파수 근방에서는 Notch filter의 경사를 유지시켜 주기 때문에 대단히 가파른 경사를 갖는 Sharp cut-off 저역통과 여파기가 된다. The development of I.C. techniques has added a new and important network element, distributed R-C network. This paper discusses the properties and parameters of this network, and how to compose a sharp cut-off low-pass filter with this element. The realization method of a sharp cut-off low-pass filter is that the frequency lower than the null frequency of the notch section passes in the pass band of the low-pass section, and the frequency higher than the null frequency gets very high attenuation in the stop band by the low pass section.
Optimum seismic design of ventilation fan for nuclear power plant
장익수,최은호,조진래,손권,임오강 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
This paper conducted the spectrum analysis using the response spectrum suggested on the emergency diesel generator room ventilatingfan, a ventilation fan for nuclear power plants, in order to examine its structural safety. Furthermore, regarding the structural characteristicsof the current base frame, the optimum design was conducted with the help of finite element analyses in order to increase the fundamentalnatural frequency over the specific frequency level (33Hz). The optimum results were verified through the comparison betweenthe initial model with the optimized one, and the optimum solution could be reflected into the actual design in field.
장익수 명지대학교 1975 明大論文集 Vol.8 No.-
본 논문에서는 X-Band에서 이용가치가 큰 평면형 마이크로스트립 안테나의 복사특성을 해석하고 그것을 실험결과와 비교 검토하였다. In this paper characteristics of coplanar microstrip antenna which is very useful in X-Band is analyzed, and the analysis is compared with the experimental result.
Double Transitions and Temperature-Independent Coarsening Dynamics of the Coupled XY-Ising Model
장익수,천무경,정광훈,허무영 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
We study the non-equilibrium coarsening dynamics and the short-time dynamics of the coupled XY-Ising model with continuous U(1) and discrete Z2 symmetry, which is believed to be the same universality class of the fully frustrated XY model (FFXY) near phase-transition points. Extensive simulations using heat-bath dynamics with U(1) variables show that the critical behaviors of this model agree with the recent suggestions for the FFXY model having double transitions and a non- pure Ising exponent, but a careful analysis also demonstrates that the domain growth laws below the critical temperature do not follow the temperature-dependent growth law of the FFXY model; rather, they follow the temperature-independent ordering kinetics, at least above T ≥ 0.1J/kB, of the pure XY and the pure Ising models.
GaAs FET 마이크로파 증폭기 (분배증폭기에서 대역폭을 증가시키는 방법을 중심으로)
장익수 대한전자공학회 1984 전자공학회지 Vol.21 No.1
This paper describes the analysis and design of a GaAs FET distributed amplifier connecting a series capacitor to get a super wide bandwidth by reducing the gate line attenuation constant. In this approach a design example with a 300$\mu$ gate length FET devices is presented, and the abtained results are; that without series capacitors the bandwidth is 2-12 GHz, but with capacitors 2-20 GHz in flat gain. 마이크로파 분배증폭기에서 게이트선로에서 감쇠정수를 줄여서 대역폭을 넓히기 위하여 FET 칩에 직렬 케페시터를 삽입할 때 대역폭이 증가되는 관계를 유도하고 이때 분배증폭기의 설계방법을 제시한다. 실제 예로서 300μ 게이트 FET로써 4개 소자를 썼을 때 2-12GHz의 대역폭을 직렬 케페시터를 삽입하여서 2-200Hz까지의 균일한 전력이득을 얻었다.
단백질 자연구조 인식을 위한 단백질 에너지함수의 디자인 및 추출
장익수,허무영 한국물리학회 2004 새물리 Vol.49 No.2
The main problems of protein folding which has recently received much attention, are proteinstructure prediction, folding kinetics and sequence design. In order to tackle these problems, we should know the interactions among atoms or amino acids in the proteins. These interactions provide the basic principles and methodology for solving the main problems of protein folding. In this paper, we report how to extract more eciently protein energy functions that can be used for tackling these protein problems. In order to obtain protein energy function more eciently, we should have (1) a good set of representative proteins that represents all kinds of well-known protein structures, (2) well-established protein energy functions that characterize the essential features of proteins and (3) a method for extracting good protein energy functions from the representative protein set. We will introduce the important physical, chemical and biological features of protein and their amino acids that can be used for extracting the protein energy functions and the various interactions among amino acids.