주철의 열적 성질에 미치는 흑연형상 및 첨가원소(Mn , Ni)의 영향

권혁무,노무근 한국주조공학회 1989 한국주조공학회지 Vol.9 No.1

SGCI(Spheroidal Graphite Cast Iron), CVGCI(CV Graphite Cast Iron) and FGCI(Flake Graphite Cast Iron) having different contents of Mn(0.25%∼0.85%) and Ni(0.3%∼1.2%) were produced, respectively. The thermal expansion and thermal conductivity of the cast iron were investigated in the temperature range of 50℃∼300℃. As the graphite nodularity of the cast iron increases, thermal expansion coefficient increases, thermal conductivity and electrical conductivity to thermal conductivity ratio decrease. The thermal expansion coefficient of the cast iron increases with increasing Mn content and decreases with increasing Ni content. The thermal conductivity of the cast iron decreases with increasing Mn and Ni contents.

잉고트의 응고에 미치는 잉고트케이스 재질의 영향

권혁무,김택기,노무근 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.6

Hypoeutectic Al-9%Si and Al-4.5%Cu alloys were casted in four kinds of ingot case materials with different thermal conductivity, and the solidification phenomenon was investigated by measuring shrinkage cavity, centerline feeding resistance, cooling rate of melt, temperature gradient of ingot cases and interdendritic arm spacings. The ingot case materials studied were flake graphite cast iron(FGCI), CV graphite cast iron(CVGCI), spheroidal graphite cast iron(SGCI) and FGCI/CVGCI/SGCI from the bottom side of an in got case. An ingot case composed of FGC/CVGCI/SGCI showed less shrinkage cavity and centerline feeding resistance than those of either FGCI, or CVGCI or SGCI. The cooling rate of melt was a bout 1.5℃/sec faster at the sideline than at the centerline of the melt. The secondary dendritic arm spacing was measured to be inversely proportional to the cooling rate of the melt.

선택조립방식의 효율성에 대한 시뮬레이션 검토

권혁무,이영준,이민구,홍성훈 한국품질경영학회 2017 품질경영학회지 Vol.45 No.4

Purpose: This paper compares the effectiveness of typical selective assembly criteria and suggests the most promising one. Based on the result of a computer simulation, the key issues of selective assembly are examined and the best criterion is recommended from the effectiveness perspective. Methods: Using JAVA program, production of ten thousand units for each pair of components are simulated for selective assembly of the two types. And the number of mismatching and the fraction nonconforming for each criterion are determined. Results: The best match criterion appeared to be most promising from the perspectives of both mismatching and nonconforming problems. Its effectiveness appears to be also good even when the precision of one component is different from that of the other. Conclusion: For designing an optimal method for selective assembly, the best match criterion is recommendable as the base criterion.

工業界 高等學校 金屬加工(Ⅰ)의 實習指導 指針書 開發에 관한 硏究

權赫茂,林榮彦,申世均 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.1

The purpose of metal working(1) laboratories of a technical high school curriculum is to prepare the student efficient work performance in the field of foundry engineering. In order to achieve this purpose, a teaching guide book should be written by the teacher in actual charge of the course under consideration, needs of local industry, practice -equipment of schools and students pre-condition. In this study, the process of development of metal working (1) laboratory is investigated and a teaching guide book for melting operation of cast iron was developed. When a teaching guide book is developed, the following items are necessary to be taken into account: 1) Setting up practice-plan, job analysis of the section should be done and the operations plan to be developed step by step. 2) Student arrangement for each job should be planned. 3) The teacher should provides the subject-library with work-standard and require prelimihome work about each job. 4) The teacher should prepare audio-visual aid to as to understand the relationship between theory and practice. 5) A teaching guide book includes ⅰ) preliminary home-work relative to each operation, ⅱ) the point of observation and recording form, ⅲ) the point of discussion after practice, ⅳ) the evaluation standard.

Bainite 球狀黑鉛鑄鐵의 磨滅特性에 미치는 殘留Mg의 影響

權赫茂,朴相俊,金水泳 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.2

Bainite spheroidal graphite cast iron specimens of 0∼0.054wt % residual Mg were casted into a green sand mold, 25 mm thickness Y-block. The microstuctures of the castings were studied for mechanical properties and abrasion characteristics. The results obtained from this study are summerized as follows: 1) Under the present expermental conditions, the relation between the abrasion speed and the abraded amount are; 0.5m/sec for 1^st abrasive wear and 2.38m/sec for 2^nd abrasive wear. 2) Increasing the residual Mg, the first abrasion speed for 2nd abrasive wear moved to the low abrasion speed. 3) The maximum amount of abraded material during 2^nd abrasive wear decreases with the increasing residual Mg content, and moves to the high abrasion speed as the residual Mg is increased over 0.042 wt %. 4) The amount of abraded materials increases with the decreasing residual Mg at abrasion speed 2.38 m/sec and with the increasing residual Mg at abrasion speed 0.62∼1.14 m/sec. 5) Increasing the abrasion speed, abrasion mechanisms are as follows; ⓐ 1^st abrasive wear ⓑ 1^st corrosive wear ⓒ 2^nd abrasive wear ⓓ 2^nd corrosive wear. But, Under the present expermental condition the adhesive wear mechanism didn't appear.

1981년도 추계 학술강연 및 발표대회 개요 : Copper base alloy 의 형상기억효과 (形狀記憶效果)

권혁무,장충근 대한금속재료학회 ( 구 대한금속학회 ) 1981 대한금속재료학회 학술대회 개요집 Vol.1981 No.1

Porcine Respiratory Coronavirus (DD312와 ISU-3)의 Spike Gene Deletion의 분석

권혁무 江原大學校 遺傳工學硏究所 1996 生命科學硏究論叢 Vol.14 No.-

미생물 · 면역학 : PCR 과 RFLP 분석을 이용한 transmissible gastroenteritis virus 의 spike glycoprotein gene 과 nonstructural protein gene 의 분석

권혁무 대한수의학회 1996 大韓獸醫學會誌 Vol.36 No.3

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미생물, 면역학 : 돼지 전염성 위장염 바이러스 ( 국내분리주 ) 의 분자생물학적 특성 규명

권혁무,피재호 대한수의학회 1998 大韓獸醫學會誌 Vol.38 No.2

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미생물 면역학 : Infectious bursal disease virus ( 국내분리주 ) 의 variable VP2 gene 의분석

권혁무,김대규,성환우 대한수의학회 1999 大韓獸醫學會誌 Vol.39 No.3

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