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구와 수직면이 충돌할 때 유막의 영향에 관한 실험적 연구
김병철,김기형,홍석주 조선대학교 동력자원연구소 1995 動力資源硏究所誌 Vol.17 No.1
Oil film can not only reduce the error in the course of manufacturing process but also soften the sliding contact so it can increase the efficiency of machine. Then in many case of cold rolling there are impacts and the oil film influence on the structure of the surface. In the case of being oil film and not being oil film the surface with direct contact, it was flated by impact and the other was sinusoidal by the oil film of dynamic pressure, when the oil film is broken by the impact the metal begin to contact and when the viscosity is thick it was hard to break.
김병철 일념 1993 교수아카데미총서 Vol.6 No.-
문학도 예술의 한 분야임에는 틀림이 없으나 여기서는 문학과 그밖의 여러 예술과의 관계를 고찰해 보고자 한다, 문학과 미술 및 음악과의 관계는 고도로 다양하고도 복잡하다. 시는 회화니 조각이니 음악이니 하는 것으로부터 영감을 얻을 때가 있다. 자연물이나 인물들처럼 다른 예술작품도 시의 주제가 될 수 있다. 일례를 듣자면 말라르메의 「半獸神의 오후」는 런던의 국립미술관에 있는 부쉐 Boucher의 그림에서 영감을 얻었다고 한다. 이와는 반대로 분명히 문학이 희화나 음악의, 특히 성악과 표제음악의 주제로 될 수도 있다. Constituent structures of 1/2 or 1/4 parts of dielectric resonators (DRs) reflected in the metallic mirrors were studied. The structures were studied by electrodynamics in order to optimize constituent devices. By the controlling of air slot between parts of DRs and mirrors (which were waveguide walls), it is possible to change a central frequency of the constituent structure or its attenuation frequency characteristic. Experimentally examined resonant devices show a high quality factor and allow to fast change of their resonant frequency (up to 20-25%). Based on these concepts, bandpass and bandstop frequency tuned filters were realized. Electronic adjustment of studied devices is possible as well, if the air slot of constituent resonant structure is shunted by the PIN diode.
김병철 일념 1994 교수아카데미총서 Vol.7 No.1
글을 시작하기 전에 우선 과거 우리 문학이 서양문학을 어떻게 愛容하여 그것을 자기 문학의 영양소로 삼았는가 하는 것을 밝힌 다음, 이러한 역사적 관점에 초점을 두고 세계 속에서 우리 문학이 한 지점을 차지하려면 앞으로 어떻게 하면 될까 하는 그 가능성에 관하여 내 나름대로의 생각을 開陳해 볼까 한다. 그래서 우리 문학에 있어서 세계 문학의 愛容의 문제와 그 轉信태도를 밝히려는 데에다 중점을 둔, 즉 변증과 귀납을 주종으로 하는 방법론을 세운 것이다. 따라서 이 글에서는 과거에 있어서의 세계 문학의 수용 가운데서 특히 우리 조상들이 관심을 두고 수용하여 그 자양소를 우리 문학에 移植시킨 중요한 문학사적 사건들을 일단 고찰해 보기로 하겠다. Heavy reliance of the Internet and worldwide connectivity has greatly increased the potential damage that can be inflicted by attacks launched over the telecommunication network. It is not easy to prevent such attacks by the use of simple security policies, firewalls, or other mechanisms because system and application software always contains unknown weakness or bugs. This paper reviews the current network attack and intrusion detection methodologies to present the requirements for network security systems. And this paper suggests a measure for effectivity of the security systems.
Disk type Thermistor를 利用한 溫度測定에 關한 硏究
金炳哲 朝鮮大學校 動力資源硏究所 1982 動力資源硏究所誌 Vol.4 No.1
In the low temperature regions, the temperature measurements using the thermistors were processed by experiments and concluded as follow; 1) In the characteristic values, (a.b) of themistors, the ranges of a were from 0.025 to 0. 065 and those of b were from 3064 to 3452. 2) The errors of temperatures were the minimum in the average values of characteristic values of thermistors and rhs average error of temperatures was 0.111% and that of resistanes was 0.25%. 3) Thu errors of readout instruments were not effected so largely in the average values because the readout instruments acted independently. 4) In the ranges from O℃ to 100℃, the accuracy of home-made thermistors for temperature compensations in temperature measurements was 0.1%.
金炳哲,金敏洙 조선대학교 동력자원연구소 1989 動力資源硏究所誌 Vol.11 No.2
This study was investigated on the heat transfer ohenomana under the energy storage processing using the paraffin wax. To observe and analyze. The heat transfer phenomena of the thermal energe storage it was constructed and the paraffin was inserted in it and heated. Also the melting temperature melting ration, energe transfer and melting pattern was measured. In the presence of the superheated liquid, natural convection occured in theliquid paraffin, and the shape of the solid-liquid interface wqs changed by the natural convection flow with time. It was found that repeatable and continuous direct contact of the melting solid with the tube wall was established at an inclination of about 15 degree and that further increase in inclination had virtually no effect fon the melting results. Direct contact gave rise to substantial enhancements in the amount of melted mass and in the energy transfer.