http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
EH36-TM강의 대입열 EGW 용접부 저온 인성에 미치는 미세 조직의 영향
최우혁,조성규,최원규,고상기,한종만,Choi, Woo-Hyuk,Cho, Sung-Kyu,Choi, Won-Kyu,Ko, Sang-Gi,Han, Jong-Man 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.1
The characteristics of high heat input (342kJ/cm) EG (Electro Gas Arc) welded joint of EH36-TM steel has been investigated. The weld metal microstructure consisted of fine acicular ferrite (AF), a little volume of polygonal ferrite (PF) and grain boundary ferrite (GBF). Charpy impact test results of the weld metal and heat affected zone (HAZ) met the requirement of classification rule (Min. 34J at $-20^{\circ}C$). In order to evaluate the relationship between the impact toughness property and the grain size of HAZ, the austenite grain size of HAZ was measured. The prior austenite grain size in Fusion line (F.L+0.1 mm) was about $350{\mu}m$. The grain size in F.L+1.5 mm was measured to be less than $30{\mu}m$ and this region was identified as being included in FGHAZ(Fine Grain HAZ). It is seen that as the austenite grain size decreases, the size of GBF, FSP (Ferrite Side Plate) become smaller and the impact toughness of HAZ increases. Therefore, the CGHAZ was considered to be area up to 1.3mm away from the fusion line. Results of TEM replica analysis for a welded joint implied that very small size ($0.8\sim1.2{\mu}m$) oxygen inclusions played a role of forming fine acicular ferrite in the weld metal. A large amount of (Ti, Mn, Al)xOy oxygen inclusions dispersed, and oxides density was measured to be 4,600-5,300 (ea/mm2). During the welding thermal cycle, the area near a fusion line was reheated to temperature exceeding $1400^{\circ}C$. However, the nitrides and carbides were not completely dissolved near the fusion line because of rapid heating and cooling rate. Instead, they might grow during the cooling process. TiC precipitates of about 50 ~ 100nm size dispersed near the fusion line.
초음파 진단영상 대조도 개선을 위한 확률 경계 맵을 이용한 연구
최우혁,박원환,박성윤,Choi, Woo-hyuk,Park, Won-hwan,Park, Sungyun 대한한의진단학회 2016 大韓韓醫診斷學會誌 Vol.20 No.1
Ultrasonic imaging is the most widely modality among modern imaging device for medical diagnosis. Nevertheless, medical ultrasound images suffer from speckle noise and low contrast. In this paper, we propose probabilistic edge map for ultrasound image edge enhancement using automatic alien algorithm. The proposed method used applied speckle reduced ultrasound imaging for edge improvement using sequentially acquired ultrasound imaging. To evaluate the performance of method, the similarity between the reference and edge enhanced image was measured by quantity analysis. The experimental results show that the proposed method considerably improves the image quality with region edge enhancement.
니켈기 초내열 합금의 천이액상확산접합 특성에 미치는 접합 온도 및 가열 속도의 영향
최우혁,김성욱,김종현,김길영,이창희,Choi Woo-Hyuk,Kim Sung-Wook,Kim Jong-Hyun,Kim Gil-Young,Lee Chang-Hee 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.2
This study was carried out to investigate the effect of bonding temperature and heating rate on transient liquid phase diffusion bonding of Ni-base superalloy. The heating rate was varied by $0.1^{\circ}C$/sec, $1^{\circ}C$/sec, $10^{\circ}C$/sec to the bonding temperatures $1100^{\circ}C,\;1150^{\circ}C,\;1200^{\circ}C$ under vacuum. As bonding temperature increased, maximum dissolution width of base metal increased, but a dissolution finishing time decreased. The eutectic width of insert metal in the bonded interlayer decreased linearly in proportion to the square root of holding time during isothermal solidification stage. The bonding temperature was raised, isothermal solidification rate slightly increased. As the heating rate decreased and the bonding temperature increased, the completion time of dissolution after reaching bonding temperature decreased. When the heating rate was very slow, the solidification proceeded before reaching bonding temperature and the time required for the completion of isothermal solidification became reduced.
EXIF정보를 이용한 위치기반 디지털사진 앨범의 설계 및 구현
최우혁 ( Woo-hyuk Choi ),김진호 ( Jin-ho Kim ),김진일 ( Jin-il Kim ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.2
본 논문에서는 디지털사진의 효율적인 관리를 위하여 EXIF정보를 이용한 위치 기반의 디지털사진 앨범을 설계하고 구현한다. 촬영된 디지털사진을 과거에 일어난 사건으로 정의하고, 인간이 사건의 인지에 시간적 배경인 시간정보와 공간적 배경인 공간정보를 사용하고 있는 점을 착안하여 이를 기반으로 한 앨범의 설계와 제작을 보인다. 시스템은 대표적인 디지털사진 파일의 포맷으로 사용되는 JPEG/EXIF 포맷의 EXIF정보에 포함된 사진촬영 날짜와 GPS정보를 이용하여 설계되어 기존의 사진 관리시스템보다 효율적인 사용자 상호작용이 가능하다.
가치 사슬과 지역의 중진국 함정: 태국 동북부 지방의 상위 설탕 가치 사슬을 사례로
최우혁 ( Woo Hyuk Choi ),에도안드리에세 ( Edo Andriesse ) 한국경제지리학회 2014 한국경제지리학회지 Vol.17 No.4
In this paper insights from studies on the middle income trap and value chains analyses are combinedto investigate one particular industry in one particular region: the sugarcane industry in NortheasternThailand. Focusing on this region enables an in-depth focus on geographical differentiation of the middleincome trap. The empirical outcomes demonstrate that policymakers involved with sugar should look at theparticular challenges in Northeastern Thailand: 1. The role of brokers which is unaddressed in the currentregulatory environment; 2. A lack of information of the regulatory environment among growers; 3. Distrustbetween growers and millers; 4. Alack of implementation of R&D efforts; 5 .A lack of support from associations;6. The labor shortage problem, and 7. No incentives for growers, brokers and millers to improve qualityand embark on upgrading. Since agricultural value chains in Southeast Asia often start in relatively poorrural areas it is imperative that policymakers balance the interests of upstream, midstream and downstreamactors. Unfortunately, this is rather difficult as midstream actors (millers) and wholesalers are powerful andtherefore, are in the best position to defend their interests. Our insights could function as comparative materialfor similar studies within other Southeast Asian upstream value chains.