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한상린,조규봉 충남대학교 경상대학부설 경영경제연구소 1997 경영논집 Vol.13 No.2
본 연구에서는 산업재 시장에서 구매자와 공급업자간의 장기협력관계에 거래특성요인 및 관계결속요인이 어떠한 영향을 미치는지를 개념적으로 규명하고, 구매자와 공급업체간의 장기협력관계가 관계성과와 어떠한 관련이 있는가를 파악하고자 하였다. 장기관계에 따른 성과에 영향을 미치는 관계결속(Relational Commitment)으로는 몰입(Commitment)과 신뢰(Trust)를 설정하고 각각의 관계 결속에 영향을 미치는 거래특성변수에 대한 접근방법으로서 거래비용측면에서의 기회주의, 거래특유자산, 기술적 요인, 제품의 특성, 의사소통의 용이성, 환경불확실성 등을 연구변수로 사용하여 하나의 개념적 연구모형을 제시하였다.
人體에서 分離한 葡萄糖 非醱酵菌의 抗菌劑 耐性에 關한 硏究
李淵台,崔承求,朴哲熙,曺圭鳳 단국대학교 대학원 1991 學術論叢 Vol.15 No.-
This experiment was conducted to classify for the 82 strains of glucose nonfermentative bacteria obtained from K hospital, in 1988, on the biological differentials and to test the resistance reaction on the drugs for those strains. The results were as follows : 1. Eighty two strains were classified into 65 strains of 79.3% of Ps. aeruginosa, 10 strains of 12.2% of Ps. cepacia, and 7 strains of 8.5% of Ac. calcoaceticus as results of 0 F sugar test, oxidase test, and DNase test. 2. It showed that Ps. aeruginosa was coincided with AP, CM, GM, KM, CF, and TC from the disk and MIC methods in the test of resistance reaction to antimicrobial agent, and especially, that AK and TOB KM and GM were observed high resistance reactive from MIC method. Resistnace to antibiotics for Ps. cepacia showed the identical reaction to AP, CB, CM, AK, SPT, CF, TC, TOB, KM and GM were observed high resistance reative from MIC method. Ac. calcoaceticus was identified the same resistance reaction to antibiotics to CB, KM, GM, AK, CF, and TOB, AP, SPT and TC showed high resistance reaction from the disk method. 3. CF and AP were observed the highest resistance reactions among 10 kinds of drugs used in this experiment and following was CM, KM and TC in order. 4. Ps. aeruginosa, Ps. cepacia, and Ac. calcoaeticus showed all multiple resistance reactions in the test of resistance to drugs, and Ps. aeruginosa was identified high resistance reaction to 6 drugs in 24.6%, Ps. cepacia was 9 drugs in 60%, and Ac. calcoaceticus showed resistance reaction to various kinds of drugs. 5. It showed important question in result of these studies that resistance percentage of NFB decreased by optimal antimicrobial selection and effective treatment established from serious antimicrobial treatment.
가공열처리한 Ti-Ni-Cu 형상기억합금의 형상회복응력
하광수,남태현,조규봉,허신구 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.3
Shape recovery stress of thermo-mechanically treated Ti-Ni and Ti-Ni-Cu shape memory alloys has been investigated by means of thermal cycling test under constant load and also and effect of thermo-mechanical treatment on transformation behaviour and transformation temperatures has been examined by means of electrical resistivity measurements, differential scanning calorimetry and X-ray diffraction. Transformation behaviour was not changed by thermo-mechanical treatments in Ti-Ni-Cu alloys, while it changed from B2(cubic)-B19'(monoclinic) to B2-R(rhombohedral)-B19' in the Ti-Ni alloy. Martensitic transformation start temperature increased silghtly by thermo-mechanical treatments in Ti-Ni-Cu alloys, while it decreased largely in the Ti-Ni alloy. Shape recovery stress of Ti-Ni-Cu alloys was larger than that of the Ti-Ni alloy. This was attributed to the fact that the maximum recoverable elongation of Ti-Ni-Cu alloys was larger than that of the Ti-Ni alloy. And also shape recovery stress depended of Cu-content. It increased from 290MPa to 400MPa with increasing Cu-content up to 5at%, and then decreased from 400MPa to 375MPa with increasing Cu-content from 5at% to 10at%.
Ti 첨가된 HY180 강의 기계적 성질 및 미세조직에 미치는 템퍼링 조건의 영향
남태현,안인섭,조규봉 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.10
Changes in microstructures and mechanical properties of HY180 steels with tempering condition have been investigated by means of scanning electron microscopy, transmission electron microscopy, vickers hardness test, tensile test and Charpy impact test. Rehardening phenomena distingushed from the secondary hardening occurred in HY180 steels on tempering below 813˚K The maximum hardness(Hv 540) and tensile strength(1370㎫) were obtained in a 0.05wt%Ti-HY180 steel tempered at 753 K for 20 hours. This is attributed to the very fine(50㎚ M₂C(M=Mo,Cr)) carbides which appeared to be peculiar tc the rehardening phenomena. The maximum impact absorption energy(208J) was obtained in a 0.05wt%Ti-HY180 steel tempered at 753 K for 10 hours. This was due to complete dissolution of brittle cementite.
플라즈마용사한 Mo 및 Co합금 피복층의 상변태거동 및 고온기계적성질
김병기,남태현,하국현,조규봉,이수완 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.10
Phase transformation behaviours and high temperature mechanical properties of Mo and Co alloy coating layers made by plasma spray coating method have been investigated by means of optical microscopy, X-ray diffraction, high temperature microvickers hardness and wear tests. The splat is relatively flat with the boundary in Mo coating layers, whereas wavy in Co alloy coating layers at high temperature. Crystallization of Co alloy coating layers which were amorphous at room temperature started to occur at about 1073 K and consequently Co_7Mo_6 and Co₃Ma compounds were formed. Wear volume of Co alloy coating layers almost kept constant with increasing temperature below 1073 K, and then started to increase at 1073 K. This was attributed to the crystallization which resulted in decrease in hardness- Wear resistance of Co alloy coating layers was superior to that of Mo coating layer overall test temperatures.
HY180 강의 미세조직 및 기계적 성질에 미치는 오스테나이징처리 조건의 영향
남태현,안인섭,허경철,조규봉 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.9
Effect of grain size and inclusions on tensile strength and the Charpy V-notch impact absorption energy of HY180 steels has been investigated by means of optical microscopy, energy dispersive X-ray spectrometry, scanning electron microscopy, tensile tests and Charpy V-notch impact tests. Grain growth during austenizing treatments in Ti-modified alloy was smaller than that in Ti-unmodified alloy. and consequently Ti addition was very effective to grain refinements of HY180 steels. Inclusions containing Ti and S were formed in Ti-modified alloy, while MnS in Ti-unmodified alloy. Tensile strength decreased with raising austenizing temperature, which was attributed to the grain growth. The Charpy V-notch impact absoprtion energy of Ti-unmodified alloy increased with rasing austenizing temperature, while it kept almost constant in Ti-modified alloy, although grain size of the alloy increased.