Strain Distributions of Plane-Strained and Simple-Sheared Al–Mg Alloy

Hyeon‑Woo Son,Jae‑Cheol Lee,Hyun Soon Park,Soong‑Keun Hyun 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11

Strain distribution in plane-strained (rolling) and simple-sheared (torsion) Al–Mg alloy has been estimated using both X-rayline profile analysis and electron backscatter technique. The strain analyses under unified texture distribution by orientationrotation showed that torsion has relatively homogeneous strain distribution regardless of texture component in contrast toinhomogeneous strain in rolling. In addition, annealing texture of torsion has more random texture than inhomogeneousrolling texture. Lower texture difference index in annealed torsion specimens suggest homogeneous strain distribution insimple shear has a higher resistance to strain-induced boundary migration, which has been known to be main reason forstrong development of ND||⟨100⟩ component during annealing of rolled Al sheet.

이방성 담낭(Bicameral Gallbladder) : 1례 보고

이현경,오연희,김승현,이성우,안우섭 동국대학교 경주대학 1996 東國論集 Vol.15 No.-

담낭의 선천성 기형 중 이방성 담낭은 매우 드문 기형으로 저자들은 우상복부 동통을 주소로 내원하여 초음파, 전산화 단층 촬영, 간담도 스캔 검사에서 이방성 담낭으로 진단되고 수술로 확진된 이방성 담낭(Bicameral GB) 1례를 경험하였기에 문헌 고찰과 함께 보고 하고자 한다. The bicameral gallbladder is one of the rarest congenital malformation of the gallbladder. A 26 years-old male was examined for the colicky pain in right upper quadrant area. On sonographic examination the lumen of gallbladder was partitioned, nearly completely, into two chamber(fundal and ductal) that are of approximately equal size. There was gallbladder wall thickening with cholelithiasis in the fundal chamber. Surgical finding showed bicameral gallbladder divided into two camber of same size and gallbladder wall thickening with cholelithiasis in the fundal chamber.

스트룹 테스트와 단순반응 테스트의 훈련 향상도에 관한 연구

조현우,박영민,박사엘,공추,왕초전,장신,김재화 순천향대학교 기초과학연구소 2022 순천향자연과학연구 논문집 Vol.28 No.1,2

This study which of the Stroop test training and simple response training can reduce the Stroop effect in the information processing process when continuous training is performed. 4 male students from S University(Asan-si) were divided into Stroop test training group(2) and simple reaction group(2). The test was conducted 10 times a day, and average was obtained and analyzed. The results encountered through this study are as follows. 1 The simple response training group improved more slowly than the Stroop test training group. 2. In the Stroop test training group, the rate of increase increased significantly compared to the simple response training group, but it did not increase once the record reached a certain point. 3. Simple response training at increasing values ​​was also trained on the Stroop effect. 4. In the average of phage values, both groups look similar.

텅스텐인산으로 개질된 SBA-15 촉매 상에서 아세트산의 탈수반응

우창수,He, Nong-Yue,김현국,이호인 한국공업화학회 2004 응용화학 Vol.8 No.1

TPA (tungstophosphoric acid), a typical heteropoly acid, was impregnated on SBA-15 to modify the acidic property of the mesoporous catalyst. The TPA was highly dispersed on the SBA-15 which has large surface area confirming by nitrogen adsorption, X-ray diffraction, and infrared spectroscopy. According to the result of in-situ FTIR spectroscopy using pyridine as a probe molecule, it was revealed that silanol group was gradually decreased with increasing the loading amount of TPA, and that new acidic site different from that of pure TPA was generated resulting in the enhancement of catalytic activity. TPA could act as a promoter when loaded on SBA-15 by relatively small amount, but the catalytic activity was greatly decreased due to the loss of silanol group as an active site when a large amount of TPA was loaded.

최단경로 알고리즘을 이용한 PCB 자동 배선에 관한 연구

우경환,김현호,이천희 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.19 No.1

Routing region modeling methods for auto-routing system is used grid and non-grid methods Although physical elements are small, the grid method has disadvantage that decrease the auto-routing speed due to constraint with size of grid and board, which in it is increase memory size Shape based type(non-grid method) used region process type and the shape located in memory as a individual element, and this element consumed small memory due to unique data size In this paper we developed PCB(Print Circuit Board) auto-routing system using the auction algorithm method that 1) Could be reached by solving the shortest path from single original point to various destination, and 2) without any memory dissipation with the best speed. Also, the auto-routing system developed by Visual C++ in Window environment, and can be used in IBM Pentium computer or in various individual PC system

ZSM-5 촉매를 이용한 메탄올의 탄화수소화 반응

남영우,박현영 崇實大學校 生産技術硏究所 1992 論文集 Vol.22 No.-

ZSM-5 catalysts were prepared from Na₂O-SiO₂-Al₂O₃-TPAOH-H₂O system by hydrothermal process. Methanol conversion to hydrocarbon by ZSM-5 catalyst were performed by changing the reaction time, temperature and space velocity of reaction system. Selectivity to gasoline fraction was highest at 380℃ and space velocity of [1.98g-cat.hr/mol]. Deactivated catalysts were regenerated by passing the air for 2 hrs at 500℃.

갑상선 수질암종과 유두암종의 동시 발생된 1례

고진우,김도형,김미경,김현옥,최영식 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.2

저자들은 태생학적 기원, 면역조직화학적, 분자생물학적으로 완전히 별개의 암종인 갑상선 수질암종과 유두암종이 동시에 동일한 갑상선에 발생하는 매우 드문 사례를 경험하였고 이러한 현상이 우연한 동시 발생인지, 공통의 줄기세포 기원인지 혹은 공통의 암 유발인자에 의한 것인지는 여전히 논쟁의 여지를 남겨두고 있다. It is generally believed that the origins of medullary and papillary carcinoma of thyroid are embryologically different. So mixed medullary-papillary thyroid carcinomas are rare. The two separate tumors of the present case may be coincidental double primaries. It can be assumed that at least some of the mixed papillary and parafollicular cell carcinomas are results of collision of carcinomas derived from two embryogenetically different cell types. Recently, we experienced a case of mixed medullary-papillary thyroid carcinomas. A 50-year-old woman was found to have mixed medullary thyroid carcinoma and papillary thyroid carcinoma on the same lobe with lymph node metastases. We report a this case with literature review

보건관리 대행사업장 근로자에서 건강증진에 대한 5년 사이의 지식, 태도 및 실천의 변화

임현우,김정아,안병용,박정일,구정완,이강숙 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.2

Before and after conducting the health promotion program by group occupational health service during 5 years, we surveyed knowledge, attitude and practice about general health (30 items) and occupational health(30 items) among 25 small and medium scale industry workers(before: 355 workers, after: 279 workers) for evaluation of effectiveness. The scores of knowledge for smoking, drinking, cholesterol, mental stress, management of hypertension, and risks in younger or women workers were significantly increased after conducting group occupational health service. The scores of attitude for controlling of fatty food consumption and cleaning workplace and bathing for health and that of practice for taking the periodic health examination and checking blood pressure were significantly increased but most of items in attitude and practice didn't be changed after services. According to sex, the scores of men were significantly increased in knowledge of general health, but there were not significant differences in age, job status and work duration group. In conclusion, through the group occupational health service during 5 years, only the scores of knowledge in general health were increased. It suggested that the effective program which can change workers' attitude and practice for health promotion, should be developed and conducted in small and medium scale industry workers.

미국정당의 도전과 변화

이현우 서강대학교 사회과학연구소 2003 社會科學硏究 Vol.11 No.-

1960년대 미국에서 흑인들을 중심으로 민권운동이 일어나면서 뉴딜연합으로 구성된 정당체계의 변화가 나타나기 시작한다. 그 대표적인 것이 유권자들이 새로운 이슈에 의해 재편되는 것이 아니라 정당에 대한 소속감이 감소하는 유권자 연합의 해체현상이라고 볼 수 있다. 이러한 현상을 가장 직접적으로 보여주는 것이 무당파(independents)의 증가와 투표시 분할투표(split-ticket voting)의 경향이 강하게 나타나는 것이다. 미국정당의 약화요인으로는 첫 번째가 정당의 고유기능의 약화이다. 정당이 후보자를 충원하고 공천하는 기능을 하는데 미국에서 정당개혁을 통해 후보자 공천과정이 일반인에게 공개되면서 정당의 영향력이 감소된 것이다. 두 번째 원인으로 들 수 있는 것이 대중매체의 발달이다. 미국의 정당활동이 주로 선거를 중심으로 이루어지는데 TV 등 대중매체의 발달은 정당보다는 후보자 중심의 선거운동으로 이루어지게 되었다. 미국의 정당개혁은 1910년대와 1970년대에 이루어졌다. 그러나 정당개혁은 정당의 민주화와는 연결되었지만 정당의 발전을 정당의 강화라는 의미에서 본다면 성공적이라고 할 수는 없었다. 정당의 전당대회는 이미 선출된 후보를 확인하는 이상의 의미는 갖지 못하게 됨으로써 정당의 기능을 약화시키게 된 것이다. 이는 결국 정당의 책임성이 약화되고 후보자의 영향력이 강화되었다는 것을 의미하게 된다. 후기산업사회에서 대두되는 다양한 문제들로 유럽에 서도 기존정당을 비판하면서 새로운 정당이 등장하는 것을 보면(장훈 1994) 미국에서도 사회의 복잡화로 인하여 정당에 대한 유권자의 불만이 많아지는 일부 이유를 설명할 수 있다. Civil right movements in 1960s brought about the new political party system from the old one based on New Deal coalition. Unlike the previous coalitions, Change of the party system in 1960s was characterized by dealignment rather than realignment. That is, influence of the parties has been declined in that the number of independents and split-ticket voting increases. At least two points are mentioned to explain weakness of American political parties. First, the role of parties in selection of candidates became less critical because the nomination process was opened to party members through the party reforms. Second, increase of power of mass media is referred. Election campaign using mass media such as TV is more likely to pay attention to candidates rather than parties. Party reforms in U.S. were achieved in 1910s and 1970s. Even though the reforms contributed to democratization of running parties, it should pay to make the parties mainly controlled by amateurs, ranks and files. For example, National convention has simply confirmed the decisions by mass political members. As the results, the responsibility of parties becomes weak and candidate factors in elections are more counted. In one sense, the traditional concepts of political parties cannot be an answer for various conflicts in the post-material society. It is time to redefine the role of political parties to respond to the changing environments.

고속 블록 기반 동작 추정 알고리즘을 위한 새로운 다중해상도 기법에 대한 연구

남현우 동덕여자대학교 정보과학연구소 2006 정보과학연구 Vol.10 No.-

동영상 내에 존재하는 동작벡터를 찾아내기 위한 동작 추정은 동영상 압축에 있어서 탐색 속도와 화질을 좌우하는 매우 중요한 요소이다. 본 논문에서는 다중 후보와 인접 블록을 이용하는 새로운 다중해상도 기법을 사용한 고속 블록 기반 동작 추정 알고리즘을 제안하였다. 실험 결과, 본 논문에서 제안된 알고리즘들은 기존의 3 레벨 MRMCS 알고리즘에 비해 화질 개선의 평가 항목인 PSNR에 있어서 0.01 - 0.35[dB]정도 개선되었고, 또한 탐색 속도에 있어서도 10%정도 줄일 수 있었다. In the video Compression, motion estimation for finding motion vectors have a large impact on both the searching speed and the image quality. In this paper, I propose a fast block-based motion estimation algorithm using a new multi-resolution technique with the multi candidate and the adjacent blocks. Through experiments, compared with 3 level multi-resolution technique, the proposed algorithms in this paper improves about 10% in terms of search speed per motion vector estimation and improves about 0.01 - 0.35[dB] in terms of PSNR.