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김용현(Yong-Hyun Kim),윤성훈(Sung-Hun Yoon),문승재(Seung-Jae Moon),이재헌(Jae-Heon Lee),유호선(Hoseon Yoo) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
The utilization of landfill waste as energy source by an MBT facilities was discussed. According to the limitation of landfill and incineration amount, the government announced action plan to utilize wastes and biomass as energy. MBT(Mechanical and Biological Treatment) is treatment system which combine mechanical treatment process and biological treatment process. Mechanical treatment process produce the RDF mainly through selection process and Biological Treatment process get a stable material through the treatment process of organic matter In this study, to activate the utilization of landfill waste as energy source by an MBT facilities, the MBT facility is introduced and the following effects were predicted through the center of metropolitan landfill MBT facility; 1) In 2020, an amount of municipal solid waste generation will be 6,432 ton/day, Gyeonggi 6,947 ton/day, Incheon 2,588 ton/day at Seoul, Gyeonggi, Incheon. An amount of municipal solid waste generation per person at Seoul is more than Gyeonggi. Economic growth in the influence of waste generation is considered. 2) The RDFs which are made of combustible wastes by MBT facilites are used instead of oil and coal in the cement and the paper plants. It is expected that the amount of landfill will be decreased.
Jinju Jang(장진주),Taeyang Kwak(곽태양),Young Chul Kim(김영철),Heung-Jae Chun(전흥재),Dohyung Lim(임도형) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
With the introduction of additive manufacturing by selective laser melting, complex shape such as porous structure became to manufacturability. However, it is reported that the additively manufactured Ti-6Al-4V implant has low ductility due to the needle-shaped alpha prime martensitic microstructure, and can be increased through heat treatment. Therefore, this study was to confirm the effect of heat treatment through changes in the microstructure and mechanical strength of porous Ti-6Al-4V implants additively manufactured. In the case of the specimen, an irregular porous structure like bone was applied to the cervical cage. And heat treatment was performed at 650°C for 2 hours and at 800°C for 2 hours. The specimens were measured the change in microstructure with EBSD, and mechanical strength was evaluated according to ASTM F2077 standard. As a result, it was confirmed that alpha prime phase decomposition occurred and precipitation of the beta phase in the specimens heat treated at 650°C and 800°C for 2 hours. And it was confirmed that the particle size of the beta phase grew at 800°C compared to 650°C. In addition, it showed improved ductility compared to the decreased strength at 800°C. We confirmed that heat treatment at 800 °C for 2 hours on the additively manufactured porous cervical cage is a suitable condition to improve the microstructure characteristics and ductility.
구상흑연주철의 기계적 성질 및 감쇠능에 미치는오스템퍼링 처리의 영향
이상희(Sang-Hee Lee),한현성(Hyun-Sung Han) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.3
Effect of austempering treatment on the mechanical properties and damping capacity of ductile cast iron was investigated. Maximum quantity of austenite and carbon contents in retained austenite obtained at 400℃, and increased with the increase of austempering time. Tensile strength and impact value was increased, and elogation was decreased by austempering treatment. With the increase austempering temperature, tensile strength, elongation and, impact value was decreased. Damping capacity was decreased by austempering treatment and not effect of austempering temperature and time.
프로필렌의 플라즈마 처리로 개질된 목분이 복합재료의 기계적 특성에 미치는 영향
조동련 ( Dong Lyun Cho ),하종록 ( Jong-rok Ha ),김병선 ( Byung Sun Kim ),이진우 ( Jin Woo Yi ) 한국복합재료학회 2017 Composites research Vol.30 No.2
프로필렌의 플라즈마 처리로 목분을 표면 개질하여 복합재 기지인 PP와 상용성을 가지게 하였다. 프로필렌을 플라즈마로 처리하여 증착된 소수성 박막 필름의 화학적 구조는 PP와 흡사하였다. 목분과 PP는 이축 압출기에 의해 펠렛으로 만들어 졌고 50 wt% wood powder/PP 복합재료는 사출 성형기에 의해 성형되었다. 인장강도와 굴곡 강도는 최고 7.59% and 12.43%까지 향상되었으며 파단면에 대한 SEM 관찰로 플라즈마 중합이 계면 접착력과 기계적 특성을 향상시킨 것을 볼 수 있었다. Wood powders were surface-modified by plasma-treating propylene to make them compatible with PP matrix in WPC(wood powder composite). The plasma treatment of propylene resulted in the deposition of an ultrathin hydrophobic film which had the chemical structure similar to that of polypropylene. Wood powder and polypropylene were mixed to pellets by twin screw extruder and then 50 wt% wood powder/PP composites were produced by an injection machine. Tensile strength and flexural strength were improved by 7.59% and 12.43% at the maximum respectively. SEM (Scanning Electron Microscopy) observation on the fracture surface revealed that the treatment improved the interfacial bonding and the mechanical properties of the composites.
칩 처리가 포함된 절삭유/폐유 분리 및 냉각 시스템 개발
김중선(Joong-Seon Kim),이동섭(Dong-Seop Lee),왕덕현(Duck-Hyun Wang) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.3
For most machine tools, it is necessary to remove chips and coolant oil because it they will continue to be created during the manufacture of workpieces. Existing products that are in use are installed and used as they reflect depending on the characteristics of each device separately. This study proposes a method to remove the security chip as well as developing an integrated system capable of reducing coolant damage. The Leverage AutoCAD and CATIA program was used for 2D and 3D design, shapes were identified by utilizing the KeyShot program, and the load and displacement analysis of the development apparatus was performed utilizing the ANSYS program. After the prototype underwent sufficient design review, the mixed oil separation device had a complete sensor control program using the LabVIEW program. The chip design process for transferring experiments and experiments on the mixed oil cooling device were developed for performance tests of the product. The final product resulted in an increase in space utilization during commercialization, reduced installation costs, and caused social effects such as pulmonary flow reduction, which, through the economic costs, reduces pollution, resulting in various benefits to the industry, such as deceased errors in the workplace decreases.
김용희(Yonghee Kim),이영수(Youngsoo Lee),이오연(Ohyeon Lee) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.4
The demand for formable high-strength steel (HSS) sheets has recently increased to reduce the weight of automotive bodies. The 340㎫ (Tensile Strength) grade steel sheets are widely used for body inner and outer panels. Especially, super formable 340㎫ grade steel sheets with high r-value have an excellent deep drawability co㎫red with the other 340㎫ grade steel sheets. It is very available for a part such as rear floor, center floor and dash panels used conventional mild steels up to now. We developed a super formable HSS by optimization of chemical composition, texture control and heat treatment control. It has good mechanical properties with excellent formability (tensile strength: 343㎫, elongation: 41.1% and r=2.1).
근관치료 기구의 기계 형태적 특성과 이에 따른 임상적 영향 고찰
김현철 大韓齒科保存學會 2011 Restorative Dentistry & Endodontics Vol.36 No.1
서론: 이 문헌의 목적은 Nickel-titanium (NiTi) 전동 파일의 기계적 형태적 양상과 이에 의한 임상적 연관성을 고찰하는 것이다. NiTi 전동 파일은 다양한 고유의 형태로 시장에 소개되었고 경쟁 상품에 비해서 근관 성형에 더 나은 능력을 가졌다 고 주장하고 있다. 본론: 이 문헌에서는 NiTi 전동 파일의 형태(예. 팁, 테이퍼, helical angle 등)와 파일의 임상 적용 성과 사이의 가능한 상관 관계를 다음과 같이 다룬다; - NiTi 전동 파일의 파절 양상 - 비활성 파일팁과 glide path - 파일 경사도와 임상 효과 - 파일 횡단면적과 임상 효과 - 열처리와 표면 특성 - Screw-in 효과와 치근 상아질의 유지 - Screw-in 효과를 줄이기 위한 고안 결론: 이상의 내용을 바탕으로, 임상가는 다양한 NiTi 전동 기구를 사용함에 있어 임상 상황에 적절한 장점을 고려하여 선택 하고 사용할 수 있는 도움을 받을 수 있을 것이다. Introduction: The aim of this paper is to discuss the mechanical and geometric features of Nickel-titanium (NiTi) rotary files and its clinical effects. NiTi rotary files have been introduced to the markets with their own geometries and claims that they have better ability for the root canal shaping than their competitors. The contents of this paper include the (possible) interrelationship between the geometries of NiTi file (eg. tip, taper, helical angle, etc) and clinical performance of the files as follows; - Fracture modes of NiTi rotary files - Non-cutting guiding tip and glide path - Taper and clinical effects - Cross-sectional area and clinical effects - Heat treatments and surface characteristics - Screw-in effect and preservation of root dentin integrity - Designs for reducing screw-in effect Conclusions: Based on the reviewed contents, clinicians may have an advice to use various brands of NiTi rotary instruments regarding their advantages which would fit for clinical situation. [J Kor Acad Cons Dent 2011;36(1):1-11.]
폐기물전처리(MBT)시설 설계를 위한 생활폐기물의 입도분포 및 물리화학적 특성
이남훈,박진규,송상훈,정새롬,정민수,이병철 유기성자원학회 2008 유기물자원화 Vol.16 No.1
There has been a recent trend in Korea that treatments for combustible wastes among municipal solid waste (MSW) by those methods, such as incineration and landfill are restricted as much as possible and Mechanical Biological Treatment (MBT) are encouraged actively in order to promote resource recovery. To build and operate properly these facilities, the physicochemical characteristics of MSW should be analyzed precisely beforehand. In particular, designing a crusher or separator properly which is the main process in MBT facilities of MSW, require the information on the size distribution characteristics of MSW, but they are not sufficient in the qualities and quantities yet as of now. Accordingly, this study aims to evaluate size distribution characteristics of MSW and its physicochemical characteristics by size. The samples of MSW were collected from detached dwelling area, apartment area, business area, and commercial area of A city in Korea. According to the result of analysis, paper records 29.78~60.02% by wet weight basis, so it was the most regardless of the regions where the wastes were generated. And in terms of element analysis, Carbon(C) was 34.77~44.39%, the largest friction, and Oxygen(O) was the next occupying 19.46~33.71%. As indices of RDFs, Chlorine(Cl) was 0.39~0.83%, so it was less than the standard, 2.0%(by dry weight basis); moreover, Sulfur(S) did not exceed the standard, 0.6%, either. In the size distribution of MSW, waste fraction ranging 50~80mm in diameter was the most in combustible waste while 30~50mm was in incombustible waste.