합성마그네타이트를 이용한 유상자성유체의 제조 및 분산특성

조명호,김만,민동준,오재현,Cho, Myeong-Ho,Kim, Mahn,Min, Dong-Joon,Oh, Jae-Hyun 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.8

The oil-based magnetic fluids were prepared with synthesized ultrafine magnette by allowing surfactactants such as sodium oleate and aliquat 336 to adsorb on the surface of magnetite particles. The dispersion ratio of oil-based magnetic fluids was higher than 90% when the amount of sodium oleate and aliqua 336 were more than 2.63$\times$10-2 mol and 6.56$\times$10-3 mol for 20g of magnetite respectively. The dispersion ratio of oil-based magnetic fluids with the amount of secondary surfactant addition was higher than 90% when oil-based magnetic fluids were prepared with aliquat 336 of cationic type. However oil-based magnetic fluids prepared with surfactants of anionic and nonionic type showed lower dispersion than whose with cationic surfac-tants.

냉간다단 및 프레스 복합 단조기술에 의한 솔레노이드 부품 개발

조명호(Myungho Cho),나완용(Wan Yong Rha) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

수도권 도시공간구조의 분석

조명호(Cho Myoung-Ho),임창호(Yim Chang-Ho) 대한국토·도시계획학회 2001 國土計劃 Vol.36 No.7

디스플레이산업에서 수주생산방식의 개선 및효율화 제고 방안

조명호(Myong Ho Cho),조진형(Jin Hyung Cho) 한국산업경영시스템학회 2016 한국산업경영시스템학회지 Vol.39 No.4

MTO (Make to Order) is a manufacturing process in which manufacturing starts only after a customer’s order is received. Manufacturing after receiving customer’s orders means to start a pull-type supply chain operation because manufacturing is performed when demand is confirmed, i.e. being pulled by demand (The opposite business model is to manufacture products for stock MTS (Make to Stock), which is push-type production). There are also BTO (Build to Order) and ATO (Assemble To Order) in which assembly starts according to demand. Lean manufacturing by MTO is very efficient system. Nevertheless, the process industry, generally, which has a high fixed cost burden due to large-scale investment is suitable for mass production of small pieces or ‘mass customization’ defined recently. The process industry produces large quantities at one time because of the lack of manufacturing flexibility due to long time for model change or job change, and high loss during line-down (shutdown). As a result, it has a lot of inventory and costs are increased. In order to reduce the cost due to the characteristics of the process industry, which has a high fixed cost per hour, it operates a stock production system in which it is made and sold regardless of the order of the customer. Therefore, in a business environment where the external environment changes greatly, the inventory is not sold and it becomes obsolete. As a result, the company’s costs increase, profits fall, and it make more difficult to survive in the competition. Based on the customer’s order, we have built a new method for order system to meet the characteristics of the process industry by producing it as a high-profitable model. The design elements are designed by deriving the functions to satisfy the Y by collecting the internal and external VOC (voice of customer), and the design elements are verified through the conversion function. And the Y is satisfied through the pilot test verified and supplemented. By operating this make to order system, we have reduced bad inventories, lowered costs, and improved lead time in terms of delivery competitiveness. Make to order system in the process industry is effective for the display glass industry, for example, B and C groups which are non-flagship models, have confirmed that the line is down when there is no order, and A group which is flagship model, have confirmed stock production when there is no order.

실리카 에어로젤을 이용한 단열 · 내화재 개발에 관한 연구

조명호(Cho, Myung Ho),홍성철(Hong, Sung-Chul) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.10

본 연구에서는 기존의 글라스울의 흡습에 의한 변형을 해결하고 단열성능향상을 위해 실리카 에어로젤을 이용한 단열재를 개발하였다. 글라스울 단열재에 액상의 혼합 바인더를 이용하여 실리카에어로젤이 함침된 글라스울 복합체를 제조 하였다. 액상의 혼합 바인더는 수용성바인더(CMC, carboxymethyl cellulose)와 물에 분산시킨 실리카 에어로젤을 이용하여 준비하였다. 초기 0.048 g/㎤의 밀도를 갖는 글라스울 보드를 준비하고 실리카 에어로젤을 함침시켜 0.065 g/㎤의 밀도를 갖 는 단열보드를 제작할 수 있었다. 이렇게 제조된 실리카 에어로젤 함침 글라스울 보드 복합체는 단일 글라스울 보드의 단열 성능보다 7.4% 향상된 0.0315 W/mK의 열전도율(thermal conductivity)을 나타내었다. 제조된 실리카 에어로젤-글라스울 복합 체는 불꽃 관통시험에서 362초간 내화 저항성을 나타내어 단일 글라스울 보드에 비하여 2.7배나 높은 내화성능을 보였다. 또한 일반 글라스울 보드는 흡습에 의하여 수직방향으로 처짐현상을 나타내는 단점이 있었으나, 실리카 에어로젤이 함침된 보드에서는 실리카 에어로젤의 발수특성으로 인하여 높은 내수성능을 나타내는 것을 확인하였다. In this study, silica aerogel-glass wool composites were developed for improvement of thermal conductivity and overcoming the water adsorption of glass wool boards. Silica aerogel-glass wool composites were prepared by glass wool and silica aerogel with liquid binder. Mixtures with binder were composed of CMC (carboxymethyl cellulose) and silica aerogel for glass wool board. Silica aerogel-glass wool composite boards were had 0.065 g/㎤ density by impregnation silica aerogel where from origin glass wool board at 0.048 g/㎤ density. Thermal conductivity of silica aerogel-glass wool composites were 0.0315 W/mK (up to 7.4% thermal resistance) and fire penetration time came to 362 seconds (up to 2.7 times stronger than origin glass wool board). In addition, hydrophobic aerogel characteristics prevented the adsorption of water onto silica aerogel-glass wool composite boards that was good for lightweight.

교육과정 실천가로서의 체육교사가 경험한 창의․인성 수업에 대한 내러티브(self-narrative)

조명호(Cho, Myung-Ho),임현주(Im, Hyun-Ju) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.6

The purpose of this study was to explore the future development direction and problem solving method through a middle school teacher"s narrative on the performance of creativity and character education. Field text of this study was collected for a year from March 2012 to February 2013, which included class schedule, researcher"s diary written about the class, photos, movie clips, journal of class observation, evaluation materials, dialogues among participants. For the analysis of the study, Connelly & Clandinin(2000)"s procedure of narrative analysis was used. By reading field text repeatedly, categorizing subjects of the stories in it and restructuring into research text were done. For the trustworthiness of the study, based on the honesty, neutrality of data analysis were done. Firstly, this paper shares ideas on how narrative inquiry helps a physical education teacher to shape and reshape the relational understanding of curriculum materials, students, and peer teachers. Secondly, this paper shares ideas on how a physical education teacher shapes and reshapes one"s teaching practices based on one"s contextual understanding of creativity and character education. Finally, this paper shows narrative inquiry helps to shape a physical education teachers" teaching practices which ultimately helps a researcher to grow as a good curriculum developer.

합성마그네타이트에 의한 유상자성유체 제조 및 분산특성

조명호(M. H. CHO),오재현(J. H. OH),민동준(D. J. MIN),김만(M. KIM) 한국자기학회 1995 한국자기학회 학술연구발표회 논문개요집 Vol.5 No.1

생산공정에서 TRM의 성공적 정착을 위한 Input 안정화의 역할에 관한 연구 :디스플레이 산업 중심으로

조명호(Myong Ho Cho),조진형(Jin Hyung Cho) 한국산업경영시스템학회 2016 한국산업경영시스템학회지 Vol.39 No.1

It is very important for the competitiveness and sustainable management of enterprises that the rapid changes in the managerial environments quickly and accurately are responded. For example, the large-scale investment accompanied by bad alternatives in accordance with misunderstanding of the managerial environments yields the huge cost and effort to modify and improve. In firm management, the quality of products and the productivity are influenced by changes of the endogenous factors yielded in manufacturing process and the exogenous factors as market, etc. These changes include not only changes in 4M (man, machine, material, method) but also those in the market, competitors, and technologies in the process of commodification, i.e., first, such disturbances make dispersion of the process big and odd. By Shewhart chart it can be checked that the process monitored is control-in or out. Business administration executes activities for input stabilization by monitoring changes in 4Ms, comparing with the standards, and taking measures for any abnormality. Second, TRM (technology road map) is to prospect product deployment and technological trend by predicting technologies in the competitive environment as the market, and to suggest the future directions of business. So, TRM must be modified and improved according to DR (design review) stages and changes in mass-production like input material change. Therefore, a role of TRM in input stabilization for reducing cost and man-hour is important. This study purposed to suggest that the environment changes are classified into endogenous factors and exogenous factors in production process, and then, quality and productivity should be stabilized efficiently through connection between TRM and input stabilization, and to prove that it is more effective for the display industry to connect TRM with input stabilization rather than to use TRM separately.

자동차용 고분자 복합재료

조봉규(Bong Gyoo Cho),이선석(Sun Suk Lee),조명호(Myung Ho Cho) 한국고분자학회 1995 고분자 과학과 기술 Vol.6 No.4

제장소 전노 dust로부터 $\alpha$-장분말 회수에 관한 연구(II) -전노 dust의 이용에 관한 연구-

김미성,김만,조명호,오재현,김태동,김성완,Kim, Mi-Sung,Kim, Mahn,Cho, Moung-Ho,Oh, Jae-Hyun,Kim, Tae-Dong,Kim, Sung-Wan The Korean Institute of Resources Recycling 1994 資源 리싸이클링 Vol.3 No.2

본 연구에서는 제철소 전로 dust를 사용하여 일차보고의 기초적인 철분말의 회수에 이어 semi pilot 장치의 혼식 사이클론(wet cyclone)을 사용해서 고순도의 철분말을 회소하여 분말합금용(용접봉용 포함) 원료, 철분법 페수처리용 등으로 그 용도를 개발하고자 하였으며, 이를 통하여 다음과 같은 결론을 얻었다. 1. 광양제철소 EC dust를 vibration mill로 2분 동안 마광한 다음 혼식 사이클론에 분급하여 얻어진 철분말(+200 mesh. underflow)를 다시 아트리터에서 5분 동안 마광한 후 분급실험을 하여 고순도으 철분말(Total Fe 99.76%)을 47.66% 회수할 수 있었다. 2. 전로 dust에서 회수한 철분말은 +65 mesh : 36.16%, 65/100 : 24.43%, 100/200 : 26.68%, 200/270 : 12.64%의 입도분포를 가지고 있었으며, 모두 ${\alpha}$-Fe러 flake형을 보이고 있었다. 3. 재항 CF dust와 광양 EC dust에서 회수한 철분말을 가지고 동이온 제거실험을 한 결과, 철분말에 의해서 동이온이 99%이상 제거됨을 알 수 있었다. 4. 전로 dust를 적당시간 마광하여 혼식 사이클론에 의해 +270mesh(underflow)와 -270 mesh(overflow)로 입도로 분급한 후, -270 mesh 의 입도(산화철)는 폐수처리용 원료로 사용하고, +270mesh 의 입도(철분말)는 분말합금용(용접봉용 포함) 원료로 사용하는 것이 바람직하다. In this study, the grinding and wet cyclone process of the dust for the effective separation of high purity iron powder and iron oxide were investigated. The results obtained in this study can be summarized as follows: 1. By applying the wet cyclone technique for the iron powder(+200 mesh) produced from EC dust of the Kwangyang 2nd steel making factory, the iron powder of high content more than 99.76% of Fe was obtained with 47.66% yield at grinding time of 5 minutes by attritor. 2. The particle size distribution of the iron powder recovered from converter dust is quite simillar with the iron powder of sweden Hoganas Co.(W40.24, W40.29, W40.37, W40.37OX). 3. By using iron powder, copper ions are all adsorbed and removed in any concentration ranges of copper sulfate solution(Cu:100, 200, 300, 600 ppm).