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18 Ni 마르에이징 강의 기계적 성질에 미치는 Mo 첨가량의 영향
김학모,김인배,박세윤 ( Hak Mo Kim,In Bae Kim,Se Yoon Park ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.3
Effects of Mo content and aging conditions on the amount of retained austenite and mechanical properties of 18 Ni maraging steels were investigated. Maraging steels were fabricated with variation of Mo content, 3, 5, 7, 9% and heat treated by austenitizing at 840℃ for 1 hour and then aged at 480℃ for 0.5∼100 hours. It was found that the amount of retained austenite after aolution treatment was negligible up to 5% Mo. 8 and 11 volume percents of retained austenite were obtained with 7 and 9% Mo respectively. The maximum hardness and yield strength without great loss of impact toughness were attained in the range of 4∼8 hours of aging time at 480℃ with 5% Mo. It was concluded, as a result, that the optimum Mo content for the good combination of strength and toughness is to be 5% Mo.
孫學模 건국대학교 1983 論文集 Vol.16 No.1
(1) The aim of this article is to research the roles of ideology in the political action and the communist system. (2) In general, ideological cultures consist of a goal culture and a transfer culture ; the goal culture setting up utopian future society in the classless society and the transfer culture establishing means of goal culture to justify revolutionary mess mobilization and forceful oppression to the mess of a failure in attendance. (3) Dynamics of communist systems are interaction between the ideology and system to achieve the objection. It can he defined as follow : Firstly, interregnum Secondly, system-building Thirdly, system-management (4) Change of communist system stemmed from interaction to the environments, and it brought about change of political power structures. The patterns of changes are, firstly unitary ruling dictatorship system and secondly the transformation to the collective ruling system. (5) The roles of ideology in communist system can be summarized as follow : Firstly, to set up a objection Secondly, adaptation in reality. Thirdly, stability and changes.
김도훈,원학재,김성배,김상모,이창남,김상섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
As time goes up, structural capacity of members decreases in reinforced concrete structures. The deterioration of the capacity is mainly due to the corrosion of materials, poor construction and environmental pollution, etc. This deterioration is unavoidable, thus it is necessary to develop the method for repair and retrofit of structures in order to ensure structural safety of members. The purpose of this paper is to investigate the load-deflection, ultimate strength, failure mode, and energy absorption effect. For the test, the specimen size of column is 20cm×20cm×90cm reinforced with 4 number of main bars of 13mm diameter, tied bars of 6mm diameter. The test results show that the increasement of bolt and bolt tension's quantity improve the ultimate strength and energy absorption capacity.
325 MHz 이동통신용 집중소자 Y형 서큘레이터의 설계
고연수,성원모,최학근 단국대학교 신소재기술연구소 1997 신소재 Vol.7 No.-
본 논문에서는 325 MHz 이동통신 기지국에 사용되는 집중소자 Y형 서큘레이터를 해석하고, 기존의 복잡한 수식을 통하여 설계하는 방법 대신 도표를 사용해 설계하는 간단한 설계방법을 제시하였다. 그리고, 실제 설계 제작하여 측정결과와 해석결과를 서로 비교 분석하였다. 설계방법은 % 대역폭과 페라이트 사이의 스트립선로의 고유인덕턴스 그리고 페라이트의 포화자화량과의 관계로부터 내부자계의 세기를 결정한 후 이로부터 입력 어드미턴스를 구해 외부의 정합회로를 결정하는 설계방법으로 전개하였다. 해석은 페라이트의 텐서투자율의 성분 μ와 k가 복소함수가 아니라고 가정하고(무손실이라고 하고), 정합회로까지 모두 고려한 등가회로에서 제 3포트를 격리포트로 하여 고유치 해석방법을 적용하여 손실 및 임피던스 그리고 산란행렬 고유치의 위상을 구하였다. 그리고, 이러한 해석방법으로부터 중심주파수 325 MHz에서 %대역폭, 포화자화량, 스트립선로의 고유인덕턴스와 내부자계의 관계를 밝혀서 도표로 제시함으로써 서큘레이터의 설계에 이용할 수 있게 하였다. 실제 제작된 서큘레이터는 중심주파수 325 MHz에서 반사손실이 -31dB, 아이솔레이션이 -32dB, 삽입손실이 -0.219dB로 나타내며, 해석을 통하여 얻은 결과와 거의 유사함을 알 수 있었다. In this paper, a new design method of Iumped-element Y circulator for 325 MHz mobile communication is proposed and the analysis results compared with the measured results. To develop the new design method, internal magnetic field intensity is derived from &bandwidth, characteristic inductance of stripline between two ferrites and saturation magnetization of ferrite to get the input admittance of circulator to obtain the external matching network. The analysis of circulator was based on the assuming that the circulator was lossless and the third port of its equivalent circuit was isolated, and the impedance and phase of scattering coefficient was calculated through the eigenvalues analysis. From this analysis, the relation among %bandwidth, saturation magnetization, characteristic inductance of stripline and internal magnetic field was found and the diagram for the design was suggested. Experimental results of fabricated circulator represent -31dB return loss. -32dB isolation and -0.219dB insertion loss at the center frequency 325MHz and support the theoretical prediction.
RF용 MOSFET를 위한 BSIM3v3 모델의 I-V 파라메터 최적화
심용석,강학진,양진모 대구대학교 정보통신연구소 2003 情報通信硏究 Vol.1 No.2
본 논문에서는 고주파 영역에서 정확한 동작을 예측하는 MOSFET 모델에서 핵심 역할을 하고 있는 BSIM3v3 모델의 정확한 대신호 전류-전압 특성을 위한 직류 모델 파라미터의 최적화 방법을 제안하였다. BSIM3v3의 직류 모델 파라미터는 변화가 허용되는 범위 내에서 측정된 직류 전류-전압 곡선과의 일치로 추출하였다. 또한 MOSFET의 다양한 크기에서 파라미터의 최적화를 수행하여 그 평균값을 취함으로써, 트랜지스터의 크기에 무관한 파라미터를 추출하였다. This paper proposes a DC parameter optimization method that finds the most appropriate DC paramtcr set of BSIM3v3 model accurately represent DC I-V characteristics of MOSFET devices in the giga frequency ranges. The DC I-V characteristics of BSIM3v3 model was varied by changing the DC parameter set (XL, XW, TOX, RSH, DELVTO) in order to fit the measured DC characteristics of various sized RF MOSFETs. The value of the DC parameter set was obtained by averaging the result of optimized values for various sized MOSFETs.