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박문식,Park, Mun-Sik 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.4
In design and manufacturing airframe structures which are composed of a lot of sub-assemblies and large complex profile shapes it is difficult to reduce so called hardware variations. Accordingly cost increasing factors for manufacturing airframe parts are much more than other machine parts because of the variability of fabricated details and assemlies. To improve cost and quality, accurate assembly methods and DPD techniques are proposed in this paper which are based upon using CAD/CAM techniques, the concept of KC's and the coordinated datum and index throughout the design, tooling, manufacturing and inspection. The proposed methods are applied to produce fuselage frame assemblies and related engineering aspects are described regarding the design of parts and tools in the context of concurrent digital definition. First articles and consequent mass production of frame assemblies shows a great improvement of the process capability ratio from 0.7 by the past processes to 1.0 by the proposed methods in addition to the cost reduction due to the less number of tools, reduced total assembly times and the space compaction needed by massive inventory. The need to achieve better Cpk, however, and future studies to be investigated will be addressed briefly.
우석정,박문식,U, Seok-Jeong,Park, Mun-Sik 대한흉부심장혈관외과학회 1995 Journal of Chest Surgery (J Chest Surg) Vol.28 No.8
The recommended approach for dumbell trmor is a one-stage removal by a team work of both neurosurgeons & thoracic surgeons. Recently we removed a case of dumbell tumor in a 69 years old woman with standard posterolateral thoracotomy and concomitant laminectomy as single stage operation. Postoperative course was uneventful and there were no postoperative neurologic signs.
장하나 ( Ha-Na Jang ),박문식 ( Mun-Sik Park ),연승재 ( Seung-Jae Yeon ),채도원 ( Do-Won Chae ),정승환 ( Seung-Hwan Jeong ),정은정 ( Eun Jeong Jeong ),손광표 ( Kwang-Pyo Son ),강승모 ( Seung-Mo Kang ),안선용 ( Seon-Yong Ahn ),양승 한국폐기물자원순환학회 2020 한국폐기물자원순환학회지 Vol.37 No.8
Recently, MBT (Mechanical Biological Treatment) facilities were built up and operated to separate and recycle MSW (Municipal Solid Wastes)in South Korea. However, the size distribution of MSW is very rough, and it is causing operation problem because MSW would be crushed in undersize diameter by mechanical equipment before feeding each separation process. Also, the organic material should be pre-separated to reuse recycle material in MSW. In this research, the reactor of 1ton/batch using hydro-thermal reaction was tested to present the separation efficiency and the size distribution of MSW by experimental factors.
서지혜(Ji Hae Seo),김남규(Nam Gyu Kim),박문식(Mun Sik Park),이선경(Sun Kyung Lee),박동희(Dong Hee Park) 大韓環境工學會 2014 대한환경공학회지 Vol.36 No.9
본 연구에서는 폐기물 처리에 어려움을 겪고 있는 폐슬러지를 원료로 사용하여 섬유(fiber) 형태의 생체흡착제를 제조하였다. 유기성 오염물의 용출 문제 및 처리수의 고액분리 문제를 해결하기 위하여 Ca-alginate를 이용해 폐슬러지를 고정화하였으며, 제조의 용이성 및 흡착제로써의 성능을 향상시키기 위하여 섬유 형태로 생체흡착제를 제조하였다. Alginate 사용량을 최소화 하면서 제조한 생체흡착제의 성능을 최대화 하기 위한 고정화 조건은 alginate 농도 10 g/L, 폐슬러지 농도 40 g/L, 생체흡착제 직경 0.3~0.4 mm로 결정하였다. 제조한 섬유형 생체흡착제는 2가 양이온 중금속인 Cd(II)에 대해 60.73 mg/g의 최대흡착량을 보였으며, Cd(II) 흡착 거동은 Psuedo-second-order 속도모델과 Langmuir 등온흡착모델로 잘 설명되었다. 결론적으로, 하폐수 처리공정에서 발생하는 폐슬러지는 생체흡착제를 제조하는데 사용될 수 있는 저렴한 원료이며, 이렇게 제조한 생체흡착제는 산업폐수에 함유된 유독성 중금속을 효율적으로 제거하는데 사용될 수 있다. In this study, sludge waste which has a difficulty in treating it was used to manufacture a fiber type of biosorbent. To solve the problems such as the release of organic pollutants and the difficulty in separating solid from treated water, entrapment method using Ca-alginate was used to immobilize sludge waste. Considering ease of manufacture as well as improvement of adsorptive ability, the biosorbent was manufactured in the form of fiber type. Optimum immobilization condition for minimizing the amount of alginate used and maximizing the performance of biosorbent was determined to be 10 g/L alginate concentration, 40 g/L sludge concentration, and 0.3-0.4 mm fiber diameter. The maximum Cd(II) uptake of the biosorbent was 60.73 mg/g. Pseudo-second-order kinetic model and Langmuir isotherm model adequately described the dynamic and equilibrium behaviors of Cd(II) biosorption onto the biosorbent, respectively. In conclusion, sludge waste generated from wastewater treatment process is a cheap raw material for the manufacture of biosorbent which can be used to remove toxic heavy metals from industrial wastewaters efficiently.