[논문]훗설의 “기하학의 기원” 을 통해 살펴본 건축에서의 전통의 재활성화에 관한 연구

이길주,이동언 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-

이 연구의 목적은 전통의 재활성화의 진정한 의미를 탐구하기 위한 것이다. 연구의 이론적 틀인 훗셜의 「기하학의 기원」은 근원에 대한 되물음을 통해 전통의 문제를 해명하고 있다. 전통의 재현과 재활성화는 전통의 수동적 이해와 능동적 이해에 의해 구별될 수 있는데, 전통의 재활성화는 능동적 이해를 통해 그 근원이 생활세계임을 이해하고,현시대 맞게 새로운 방식으로 전통을 재창조하는 것이다. 전통의 근원인 생활세계는 일상성의 재활성화의 바탕이 되는 세계로,사회 구성원들의 공통의 경험을 간직하고 있다. 그러나 일상적이고 습관적인 일상성이 재활성화될 수 있는 것은 의식의 지향성에 의해 새롭고 간-주관적으로 인식될 수 있기 때문이다.

STAD 협동학습 방법이 학생의 인지적·정의적 영역에 미치는 효과

신동로,김강식,서길주 全北大學校 敎育大學院 2001 敎育論叢 Vol.21 No.-

The purpose of this study was to investigate the effects of STAD cooperative learning on student's cognitive(english academic achivement) and affective domain and to provide basic material which cooperative learning can apply to teaching learning activity. The research questions were as follows. 1. Is there any difference in cognitive(english academic achievement) between STAD cooperative learning group[EG] and traditional learning group[CG]? 2. Is there any difference in affective domain(sense of self-esteem, learning attitude, friend relationship) between STAD cooperative learning group[EG] and traditional learning group[CG]? First grade were selected (EG; 30, CG; 30) in middle school located at Chonju city. Previous survey(english academic achievement, sense of self-esteem, learning attitude, friend relationship) was carried out and the result between selected schools were alike. The instruments for this study were sense of self-esteem, learning attitude, friend relationship questionnaire and academic achievement toward english subject. Statistical analysis was performed by ANOVA. The major findings of the study were as follows: 1. There was a significant difference between EG and CG, namely, the experimental group was higher than the control group in academic achievement toward english subject. 2. There was a significant difference between EG and CG. In other word, the experimental group was positive than the control group in sense of self-esteem, learning attitude, friend relationship. In sum up, the cooperative learning situation was effective than traditional learning situation on student's cognitive and affective domain, therefore, the STAD cooperative learning should be considered as a teaching·learning strategy for the development of student's cognitive and affective domain[sense of self-esteem, learning attitude, friend relationship].

네트워크 모델에서 원형 문자열 정렬에 관한 연구

이재동,최길림,김순철 慶南專門大學 2000 論文集 Vol.28 No.1

Al5083-O 용접부의 보호가스 혼합비율에 따른 저온 인성 평가

이동길,이상열,양훈승,정재강 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1

본 연구에서는 저온용기 등에 많이 사용되고 있는 알루미늄 합금 A15083-O재에 대한 보호가스 혼합비율과 저온인성과의 관계를 규명하고자 혼합가스 비율을 여러 가지로 달리 하여 GMA 용접을 하였다. 시험온도는 상온에서 극저온까지 단계적으로 낮추어가며 계장화 샬피충격시험을 실시하였다. 최대하중은 시험온도가 낮아질수록 증가하였으나 변위는 25℃부터 -85℃까지는 시험온도에 관계가 없었으나 -196℃에서는 크게 감소하였으며, 모든 시험온도 및 불활성가스 혼합비율에서 흡수에너지는 용착금속부, 용융선 및 HAZ 순으로 증가하였다. 용착금속부의 흡수에너지는 시험온도 및 불활성가스 혼합비율에 관계없이 매우 낮게 나타난 반면, 용융선 및 HAZ시험편의 흡수에너지는 모재와 거의 유사한 값을 나타내었다. 또한, 모든 시험온도에서 흡수에너지는 He의 혼합량이 증가할수록 증가하는 경향을 보여 Ar33%+He67%에서 가장 우수한 인성을 나타내었다. In this study, the low temperature toughness was evaluated by using the instrumented Charpy impact testing procedures for A15083-O aluminum alloy used in the LNG carrying and storing tank. The specimens were GMA(Gas Metal Arc) welded with four different mixing shield gas ratios (Ar100% + He0%, Ar67%+He33%, Ar50%+He50%, and Ar33%+He67%), and tested at four different temperatures(+25, -30, -85, and -196℃) in order to investigate the influence of the mixing shielding gas ratio and the low temperature. The specimens were divided into base metal, weld metal, fusion line, and HAZ specimen according to the notch position. From experiment, the maximum load was increased a little up to -85℃, and the maximum load and maximum displacement were shown the highest and the lowest at -196℃ than the test temperatures because of the brittle behavior. The absorption energy of weld metal notched specimens was not nearly depends on test temperature and mixing shield gas ratio because the casting structure was formed in weld metal zone by melting welding wire. In the other hand, the others specimens was shown that the lower temperature, the higher absorption energy slightly up to -85℃ but the energy was decreased so much at -196℃.

대장균 세포 추출액을 이용한 PCR 산물로부터의 단백질 발현

박창길,김동명 충남대학교 생물공학연구소 2005 생물공학연구지 Vol.11 No.2

In most of the current protocols for cell-free synthesis, protein synthesis is directed by plasmid templates, which requires the growth of cells for the cloning and amplification of the template DNAs. The time-and labor-intensive steps required for plasmid preparation could be avoided if the template DNAs were able to be prepared by PCR. The rapid preparation of the expression templates based on PCR methods would enable the discrepancy between the throughputs of template preparation and their translation to be overcome. We recently have developed several methods to enhance the productivity of the PCR-based cell-free protein synthesis. Through the retardation of the endo- and exo-nucleolytic degradations of the mRNA molecules, the level of protein expression from the PCR-amplified DNA templates becomes comparable to that of conventional plasmid-based reactions. The productive cell-free protein synthesis utilizing PCR-amplified DNA sequences will enable the high-throughput generation of protein molecules required for many post-genomic applications.

부유체 운동해석을 위한 개인용 전산기의 이용방법

윤길수,김동준 釜山水産大學校 1985 釜山水産大學 硏究報告 Vol.25 No.2

본 연구의 결과를 요약하면 다음과 같다. 1. 복소수를 포함하는 선형연립방정식을 푸는 한 방법으로서 부분행렬과 Choleski의 직접해법을 이용한 새로운 프로그람을 작성하였다. 2. 복소수가 정의되지 않는 개인용 전산기에서도 복소수를 포함한 선행연립방정식을 풀 수 있다. 3. 부유체의 운동해석 과정 중에서 2차원 유체력을 구하는 부분에 본 계산방법을 이용할 경우 기억공간이나 계산시간이 줄어들게 된다. 4. 부유체의 운동방정식의 해법에 본 계산방법을 이용할 경우 계산과정이 간단해지게 된다. 5. 본 계산방법은 Gauss 소거법과 비교할 때 기억공간이나 계산시간이 적게 요구된다. This paper presents an application method of personal computer for the motion analysis of Floating Bodies. For the solution of linear equations with complex coefficients, a new computational procedure is formulated and programmed using partitioning and Choleski decomposition. The method is implemented in the personal computer which can not define complex variables. From the case study, it is found that the method is efficient in the motion analysis of floating bodies, especially in the calculation of 2nd hydrodynamic coefficients. Comparison with the Gauss elimination method shows that the proposed new method requires small memory size less computing time.

구조용강의 유한요소해석 및 온도변화에 따른 피로수명 평가에 관한 연구

이동길,이상열,정재강 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2

본 연구에서는 국산 승용차의 전륜구동축 재료인 S43C와 S5OC를 대상으로 유한요소해석과 회전굽힘피로실험을 통해 고주파열처리와 온도조건에 따른 피로크랙의 발생, 전파거동을 고찰하였다. 유한요소해석 결과 하중이 가해지는 방향에 따라 반복적으로발생되는 인장응격 및 압축응력은 미소원공결함 부분에서 가장 크게 나타났다. 이러한원인은 미소원공결함이 응력의 국부적인 집중원으로 작용했기 때문으로 생각되며, 이러한 응력의 반복으로 인하여 미소원공결함을 기점으로 크랙이 발생∙성장하였음을 알 수있다. 회전굽힘피로실험 결과 두가지 재료 모두 저온(-3O℃) 피로수명은 비열처리재의 경우 상온(25℃)보다 약 110% 증가하였고, 열처리재는 약 120% 증가함으로서 온도의 저하가 피로수명을 크게 증가시킨 반면 고온(80℃) 피로수명은 상온 피로수명과 비교시 비열처리재가 약 35%. 열처리재가 약 5%의 피로수명 감소를 나타냈다. In this study, the rotary bending fatigue test was carried out with two kind of material, S43C and S5OC, using in the front engine and front wheel drive shaft of vehicle. The specimens were heat-treated by high frequency induction method and tested at room(+25℃), high(+80) and low temperature(-3O℃) in order to look over the fatigue crack initiation and propagation behavior by the heat treatment and the temperatures. Based on the FEM result, the tensile and compressive stress repeatedly generated by load direction were largest on the small circular defect due to the stress concentration. So the small crack was initiated and grew from the defect Fatigue lifts of the specimens tested at low temperature showed about 110% for as-received. 120% for heat-treated higher than at room temperature, It was found that low temperature increased so much the fatigue life. At room and high temperature, the fatigue life of as-received specimens were decreased about 35%, but that of heat-treated specimens were decreased about only 5% at high temperature more than at room temperature, Therefore, fatigue life under high temperature will be considered at design of front engine and front wheel drive shaft materials of vehicle.

절삭공구용 서멧의 자기적 특성과 기계적 성질의 관계

안동길,이정희 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.3

공업용 서멧 절삭공구는 다성분계 탄화물과 강자성체(ferromagnetic material)인 철족의 Co, Ni 결합상 금속으로 구성 되어 있다. 본 연구에서는 새로운 시도로서 금속 결합상 량과 소결조건에 따른 TiCN계 서멧의 자기적 특성의 측정에 의한 기계적 성질의 평가방법을 연구하였다. 실험에서는 결합상이 다른 상용 서멧조성의 합금을 분말 야금법에 의해 제조하였다. 소결된 서멧의 자기적 특성은 합금의 조직과 탄소량에 따라 크게 변화하였다. 포화자화(magnetic saturation, 4πσ)와 항자력(coercive force, Hc)은 비례하였으며, 고탄소 소결합금에 있어서는 Co-Ni 결합상에서의 W, Mo, Ti등의 용매원자의 농도가 낮아짐에 따라 포화자화는 증가하였다. 항자력이 높을수록 경도는 증가하였고, 서멧의 강도 및 인성은 포화자화가 증가할수록 우수하였다. 서멧공구에서 자기적 특성을 측정하여 기계적 성질을 비파괴적으로 평가할 수 있었다. The commercial cermet cutting tools consist of multi-carbide and a binder metal of iron group, such as cobalt and nickel which are ferromagnetic. In this paper, a new approach to evaluate the mechanical properties of TiCN based cermet by magnetic properties were studied in relation to binder content and sintering conditions. The experimental cermet was prepared using commercial composition with the other binder contents by PM process. It was found that the magnetic properties of the sintered cermets remarkably depended on the microstructure and the total carbon content. The magnetic saturation was proportional to increment of coercive force. At high carbon content in sintered cermet, the magnetic saturation was increased by decreasing the concentration of solutes such as W, Mo, Ti in Co-Ni binder. As the coercive force increases, the hardness usually increases. The strength and toughness of the cermet also increased with increasing the magnetic saturation. The measurement of magnetic properties made it possible to evaluate the mechanical properties in the cermet cutting tools.

One-Coil Coin Type 진동 Motor의 특성 개선

곽동수,김상길,신흥교 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-

This paper presentsthe characteristic improvements of one-coil coin type vibration motor. The rotor consists of coreless coil and 4 segments commutator. The magnet has 4 poles and is magnetized in the direction of z-axis. This one-coil coin type vibration motor has simple mechanical structure and good efficiency. So production cost is lower than other coin type motors having 2 or more coils. But it has the weak points. Such as small vibration magnitude and dead zone. By modifying the shape of rotor, vibration magnitude is increased. To avoid the dead zone we attached more magnetic body on rotor. As result, we show the optimal position of magnetic body.

ISI 프로토콜에서의 인증에 관한 연구

최길림,이재동,정광민 慶南專門大學 2000 論文集 Vol.28 No.1