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.

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

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.

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.

상악골 급속확장술식 전후 두경부 자세와 설골위치의 변화에 관한 연구

배현철,차경석,이진우 대한치과교정학회 1997 대한치과교정학회지 Vol.27 No.4

본 연구는 상악골 급속확장술식 후 호홉변화와 연관된 두경부 자세의 변화와 이에 따른 설골 위치 변화의 양상을 알아보기 위하여 시행하였다. 평균연령이 12세 9개월이고 Hellman stage Ⅲc에서 adult stage까지의 인두강이 정상적이며 상악골 급속활장술식을 시행한 Angle씨 Ⅲ급 골격양상의 남녀환자 32명을 대상으로 하여 이들 중 상악골 급속확장술식 시행 후 두경부각도가 증가된 군을 A군으로, 감소된 군을 B군으로 분류하였고 대조군은 연구대상과 동일한 Hellman stage이며 평균연령 12세 7개월의 Angle I급 골격양상을 띠는 남녀환자 23명으로 이들을 C군으로 하여 골격양상과 인두강크기, 두경부자세, 설골 위치에 대한 항목을 연구하여 다음과 같은 결론을 얻었다. 1. 골격양상과 인두강 비교 1) A, B군의 치료 전후 비교에서, 두 군 공히 하악이 하방경사되었고 인두강 크기는 변화가 없었다. 2) 세 군간의 치료 전후를 각가 비교한 결과, A, B군의 PMV에 대한 골격 양상과 인구강의 크기는 정상이었다. 2. 두경부 자세비교 1) A, B군의 치료 전후비교에서, A군은 두경부 각도가 상방으로 B군은 두경부 각도와 하악하연이 하방으로 경사됨을 보였다. 2) 세 군간의 치료 전후를 각각 비교한 결과, 치료전에 두경부 각도가 A군은 정상적이었으며, B군은 정상보다 상방 경사짐을 보였다. 치료후에는 A, B군 모두 정상적인 두경부각도를 보였다. 3. 설골 위치 비교 1) A, B군의 치료 전후 비교에서, 두군 공히 설골장축 각도의 변화가 없었고 전후방적으로 A군은 설골이 후방위치되었으며 B군은 변화가 없었다. 수직적으로는 A군의 APHFH가 증가되었을 뿐 나머지 항목에서는 두 군 모두 변화가 없었다. 2) 세 군의 치료 전후를 각각 비교한 결과, 설골장축 각도는 A, B군 모두 정상적이었으며, 전후방적으로 치료전에 A군이 B, C군보다 설골이 전방에 위치되었으나 치료후에는 A, B군 공히 정상적 위치였었다. 설골의 수직적 위치는 치료 전후에 A, B군 모두가 정상적이었다. The present study assessed the effects of Rapid Maxillary Expansion on head posture and hyoid bone position. For this study, 32 Angle's class Ⅲ patients - hellman 3c ~ adult, mean age 12y9m - were selected and divided into two groups, A,B according to craniocervical angulation. Crantiocervical angulation Increased in Group A and decreased in Group B after the therapy. And 23 Angle's class I persons ~ same hellman state, mean age 12y7m ~ were selected for the control group. Cephalometric analysis of skeletal pattern, pharyngeal space, head posture, hyoid bone position was performed. The results were as follows, 1. Comparison of skeletal pattern and pharyngeal space 1) All two group(A,B) had Mandibular plane inclined inferiorly and no pharyngeal space change was observed after RME therapy. 2) Skeletal pattern and pharyngeal space of Group A,B were normal before and after treatment. 2. Comparison of head posture 1) Cranicoervical angulation of Group A was increased after treatment. That of Group B was decreased and mandibular plane was inclined inferiorly after treatment. 2) Before treatment, craniocervical inclination was normal in Group A but larger than normal in Group B. After treatment, all two group(A,B) had normal craniocervical angulation. 3. Comparison of hyoid bone position. 1) After treatment, long axis of hyoid in Group A,B was not changed. Antero-posteriorly, hyoid position was changed posteriorly in Group A but no change was founded in Group B after treatment. Vertically, hyoid bone position were not changed in two groups except in crease in APHFH in Group B after treatment. 2) Long axis of hyoid bone was normal in Group A, B before and after treatment. Anteroposteriorly, hyoid bone positon was more anterior than Group B, C before treatment but all the position of two groups had normal position after treatment. Vertical position of hyoid bone was normal in all two groups before and after treatment.

확률 일반화 LR법을 이용한 한국어 구문분석 : Syntactic Analysis using PGLR method for Korean

박현권,김한우 漢陽大學校 工學技術硏究所 2001 工學技術論文集 Vol.10 No.-

본 논문에서는 한국어 구문 분석기를 만들기 위한 한국어 문법을 기존과 달리, 수작업된 구문트리부착 코퍼스에서 추출한다. 이렇게 추출된 한국어 문법은 많은 모호성을 포함하며, 시스템에 과다한 무리를 준다. 이를 극복하기 위해서 최적화 과정과 저빈도로 사용된 구문 규칙을 제거함으로써 효율성을 높였다. 이렇게 다듬은 한국어 문법 규칙에 확률을 부착한 후, PGLR법으로 한국어 문장을 구문 해석한 결과, 해석률 91%를 유지하면서도 평균문장 길이 이하의 문장(30 형태소)에 대해 93% 적합한 구문 분석 능력을 지니는, 한국어 구문 분석기를 완성할 수 있었다. In this paper, we extract a Korean grammar to be loaded on a Korean syntactic parser, from a large tree tagged corpus by hand. But this grammar was too heavy and too ambiguous to use itself. For resolving the structural ambiguities, we suggest 3 methods, rule optimization, pruning the high-low frequently used rules. After these processing, we get a more reasonable and efficient Korean grammar. We estimate the probability based on their frequency of occurrence, Applying statistical information from the training corpus to previous GLR parsing table enable us to rank the result from the multiple parse tree by PGLR method. For the most probable 10 parse tree, we obtained a 93% meaning appropriateness for middle length sentences, while maintaining the 91% acceptance rate.

톨루엔 노출 근로자에서 유전자적 요인, 생활습관 및 식이가 요중 마뇨산 배설에 미치는 영향

임현우,박정일,노영만,이강숙,이정민,이원철,이세훈,정치경 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.3

목 적 : 본 연구는 생물학적 지표 특성 연구를 위한 단면조사 연구로서 톨루엔 노출과 톨루엔의 생물학적 모니터링으로 이용되는 요중 마뇨산 농도간의 양-반응 관계에서 효과 변경인자로서 작용하는 유전자 ALDH2, CYPIAI, CYP2El의 다양성 분포를 조사하고, 이들 유전자가 요중 마뇨산 배설 농도에 미치는 영향을 알아보고자 하였다. 방 법 : 연구대상자는 경인지역에 위치한 22개의 사업체에서 페인트 제조 72명, 제조업에서 도장작업 50명, 인쇄업 12명, 접착작업 12명, 벽지의 코팅작업 14명등 160명의 근로자이었다. 성, 연령, 유기용제 작업장 근무경력, 흡연습관, 음주습관, 검사일 이전 밤에 음주 여부, 시료 채취전 6시간 이내에 섭취한 식품조사, 측정일 개인보호구의 착용 여부에 대하여 설문조사를 시행하였다. 톨루엔에 대한 개인노출량은 passive air sampler로 측정하였고, 요중 마뇨산은 요중 크레아틴으로 보정하여 측정하였다. 또한 aldehyde dehydrogenase 2 (ALDH2) , cytochrome P45O IAI(CYPIAI), 그리고 cytochrome P45O 2El(CYPfEl)의 유전적 다양성은 혈액으로부터 백혈구의 DNA를 추출하여 제한 효소 절단 길이 다양성 (restiction fragment length polymorphism, RFLP)법으로 검사하여 다음의 결과를 얻었다. 결 과 : 연구대상자의 요중 마뇨산 농도의 기하평균은 0.44g/g creatinine, 기하표준편차 2.80이었다. 톨루엔 노출 농도, 개인 보호구 착용여부, 안식향산이 함유된 식품의 섭취여부중 요중 마뇨산 배설농도에 영향을 미치는 인자는 톨루엔 노출 농도뿐이었다. ALDH2, CYPIAI, CYPfEl, 연령, 흡연, 근무기간에서 회귀계수간에 차이를 보이는 경향이 있었다. 요중 마뇨산 농도에 대한 다중회귀분석에서 톨루엔, ALDH2, CYPIAI, CYP2El유전자형의 회귀계수가 통계적으로 유의하였다. 결 론 : 톨루엔 노출로 인한 요중 마뇨산 배설 농도는 ALDH2, CYPIAI, CYP2El유전자 다양성에 의해 영향을 받기 때문에, 유전자형의 대사능의 차이를 고려하여 마뇨산 기준 농도를 찾는 연구가 이루어져야 하겠다. Objectives The purpose was to investigate the distributions and the effects of genetic polymorphism of aldehyde dehydrogenase 2(ALDH2), cytochrome P45O IAI (CYPIAI), and cytochrome P45O 2El (CYPfEl) on the toluene metabolism. Methods : The subacts consisted of 160 workers who were exposed to toluene in different industries such as paint manufacturing, painting on steel and wood products, printing, bonding, and coating. The exposed toluene level was monitored by passive air sam paler, and the questionnaire variables were age, sex, smoking, drinking, previous night's drinking, use of personal protectlve equipment, work duration, and taking benzoic acid containing food. The urinary hippurric acid collected in the end of shift was corrected by urinary creatinine concentration. The genotypes of ALDH2, CYPIAI, and CYP2El were investigated using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) methods with DNA extracted from venous blood. Results'The geometric mean and the geometric standard deviation of urinary hippuric acid concentration were 0.44 g/g creatinine and 2.80. The urinary hippuric acid concentration was significantly related to personal exposed toluene level among personal exposed toluene level, use of personal protective equipment, and benzoic acid containing food diet. The slope differences of the regression for ALDH2, CYPIAI, and CYP2E1 genetic polymorphism, age, smoking, and work duration tended to be significant. In multiple regression analysis, the regression coefficient of toluene, ALDH2, 7YPIAl, CYP2E1 genetic polymorphism were significant. Conclusions : From the above results, urinary hippuric acid level after toluene exposure was significantly affected by the genetic polymorphism of ALDH2, CYPIAI, CYPfEl. It is needed further investigation of the urinary hippuric acid level considering the effect of genetic polymorphism.

中央 ㆍ地方政府間의 事務配分에 관한 法的 考察

金又德,柳在賢 新羅大學校 1996 論文集 Vol.41 No.1

This study analyzes the relationship between the central and local government, with a specific focus on the allocation of functions performed by the two different levels of government. It is assumed that this study has a significant contribution to our understanding of the role of government in general and of the many functions performed by the two authorities in particular. Moreover, there is an increasing need to clarify the relationship as we are facing a new system of local autonomy in the very near future. This study regards to provide theoretical, legal and methodological basis on the allocation of functions between the central and local government, and to explore the relevant approach in Korean situation. Above purposes can be obtained as suggestions by analyzing the legal cases and experiences of several nations on the allocation of functions, and as results by analyzing the feature in the case of Korea. As focuses on the case of Korea, this study can find a few important negative characteristics seen in the administrative relations between the central and local government. First of all, the functional divisions of governmental activities in Korea are very ambiguous and the delegated activities from the central to local government is somewhat over-loaded. This gives a sign of the meticulous control, supervision, and direction to the local government from the strong central government. All in all, it means that there are not so much divisions of administrative power between the central and local government. To be more specific, we may conclude the following characteristics : 1. There are too much regulatory functions asigned to the local authorities. 2. The tool of administration mainly depends on the state power, that is the coersive or compulsory means of administration prevail. 3. The legal basis of the administrative enforcement seems lacking. 4. Especially from the point of view of the local government, administrative functions performed by the local government in the field of social welfare, rather than in the field of general administration, industry and economy, seem to show a relatively low level. Of course this remains a major problem for the local government to deal with under the new system of local autonomy. From the above discussion, the following conclusionary remarks are possible. First of all, a change of perspective toward the relationship between the two governmental entities should be introduced in order to have a reformed or better functional divisions of governmental activities. Most of all, it may be necessary to point out here that there cannot be an absolute principle regarding the functional divisions. In addition, the top-down or top-to-bottom hierarchical command system of central government should also be avoided for the betterment of the administrative relations. The points further allow us to present a few final suggestions : 1. In the realm of the functional allocation of administration, "inclusive-indicative" orientation should be changed toward a more concrete form of allocation of governmental functions. 2. A strategy to strengthen the cooperation and clarifying the functional division must be achieved in order to effectively solving the common goals of administrative tasks that now seem increasing ever more. 3. It may be necessary to make a new legal basis in the form of 'The Law of Intergovernment Proceedings and Relations'. 4. There needs a wide range of change in the functional division of administration to make the system work more efficiently. In specific, many overlapping functions performed by both the the central and local government should be cleared away, many administrative regulations or red-tapes must be suspended in order to increase the basis of competitiveness of industries and private economy in general, and many formalized administrative permissions that may not be necessary, if not for the sake of formality, should also be ended.

신주위 공간 및 요근을 침범한 췌장성 가성낭포 1례 : 진단및 경피적 배액술 Diagnosis and Percutaneous Drainage

이현경,오연희,이원재,한동선,오민구,이성우,박수성 동국대학교 경주대학 1993 東國論集 Vol.12 No.-

Pancretic pseudocyst is a well-known complication of pancreatitis and may occur in unusual locations. Involvement of the left perirenal space and psoas muscle is rare. Radiologic findings and management of a surgically proven case of pancreatic pseudocyst extending to left perirenal space and psoas muscle is described.