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.

폐결핵 환자 혈청에서 수용성 Interleukin 2 수용체 및 Adenosine Deaminase 활성도에 관한 연구

고정희,박성규,백상현,박찬권,박병수,안진영,최우석,박정규 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.1

Interleukin-2 (IL-2) induces T cell proliferation in an autocrine manner and provides a means by which antigen triggered T cells can be clonally expanded in vitro. During the following activation, the activity of IL-2 is mediated by specific high affinity IL-2 binding membrane receptors which are expressed shortly after activation. In this process, a 42 KD-fragment (soluble IL-2R) is continuously cleaved off and circulates as a soluble marker of T lymphocyte activation. Elevated level of soluble IL-2R has been identified in the serum of patients with malignant autoimmune and allergic disorders, systemic parasitic infection, undergoing graft versus host disease, acute or chronic lymphocytic leukemia and HIV-infection. ADA (adenosine deaminase) completes the process of differentiation of T cell and is essential for progression of T cell maturation. Therefore level of ADA is to correlated with magnitude of T cell immune response. The fact that expression of sIL-2R and ADA activity increases in peripheral blood T-lymphocytes of patients with active pulmonary tuberculosis suggests that T cell activation might have a major role in the pathogenesis of pulmonary tuberculosis. In order to evaluate the T cell immune response in pulmonary tuberculosis, we measured the serum concentration of sIL-2R and ADA activity in 17 patients with current pulmonary tuberculosis, 10 chronic inactive pulmonary tuberculosis, 10 as normal controls. (1) Current pulmonary tuberculosis had significantly higher levels of sIL-2R (237.24±95.47)when compared with those of inactive tuberculosis (78.6±11.06). and the control (68.17±15.4) group. (2) ADA activity in current pulmonary tuberculosis was significantly increased (34.41±20.63) when compared with those of inactive tuberculosis (24.7±14.36) and control (17.65± 5.94) group. (3) There was good correlation between sIL-2R concentration and ADA activity in serum in current pulmonary tuberculosis group. (4) sIL-2R concentration and ADA activity was decreased significantly 6 months after anti-tuberculosis drug medication. In conclusion, sIL-2R concentration and ADA activity in serum in current pulmonary tuberculosis group was increased when compared with those of inactive pulmonary tuberculosis and the control group. By the way, T cell mediated immune response was enhanced in current pulmonary tuberculosis, but in inactive chronic pulmonary tuberculosis who had treated by antituberculosis drug medication, the concentration of sIL-2R and ADA activity was nearly normal.

북한산국립공원의 계류수질 보전 전략(I)

박재현,우보명,김우룡,안현철,조현서,추갑철,김춘식,최형태,Park, Jae-Hyeon,Woo, Bo-Myeong,Kim, Oue-Ryong,Ahn, Hyun-Chul,Cho, Hyun-Seo,Choo, Gab-Chul,Kim, Choon-Sig,Choi, Hyung-Tae 한국환경복원기술학회 2001 한국환경복원기술학회지 Vol.4 No.3

This study was conducted to investigate physicochemical property changes from July 1998 to August 2001 in Mt. Bukhansan National Park. Four water sampling points were selected to measure the quality of stream water in the northeastern part of the Mt. Bukhansan National Park. The results were summarized as follows; In spring, the average pH of stream water was below the first class of the river water quality standard, while it was normal level in summer. The average electrical conductivity was about 2.3~3.3 times higher in downstream water than in upstream water during spring and summer. The contents of anions($Cl^-$, $NO{_3}^-$, $SO{_4}^{2-}$) were about 1.1~7.4 and 0.4~11.4 times higher in downstream than in upstream water, respectively. These results indicate that water quality was poorer in downstream than in upstream water. We suggest that stream water in the Mt. Bukhansan National Park should be protected from impacts of snow melting mineral particles in spring season and human impacts like wastewater of point source in summer season.

청감실험을 통한 교통소음의 주관적 반응 조사

박현구,조경숙,송혁,김선우 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

The aim of this study is to analyse the relationship between traffic noises and subjective responses. The traffic noises considered in this study were aircraft, road traffic and train, and we recorded them in order to edit by using the sound insulation performance of windows. The sound sources recorded and edited were made to be different sound level with 5 steps by 5dB. Finally 100 sounds sources were composed for the purpose of psychoacoustic experiments and we surveyed the subjective responses. As a result, the average points of the subjective response to the sound sources have shown differently depending on their sound level, the type of windows and the type of sound sources.

성당 미사공간의 실내음향특성에 관한 실험적 연구

박현구,조경숙,김선우 대한건축학회 2003 대한건축학회논문집 Vol.19 No.2

This study has performed to analyse the measurement the main hall of Catholic churches and to find out general room acoustical characteristics. Furthermore, extracted data could be used in subjective evaluation for optimum values of each physical parameter. For the reason, we surveyed whole Catholic churches located in Gwangju metropolitan city and finally chose 11 churches to measure. Room volume of buildings chosen is ranged widely from 1,782 to 9,195 cubic meter so that measured values can be distributed including various characteristics of acoustical parameters. As a result, the differences of values using PA system as sound source were larger than those using omnidirectional speaker in the center part of alter and values of D50 and C80 in the balcony floor were especially appeared to have different values comparing with those of main floor due to diversified layout of speakers. The range of RT and EDT was from 1 to 3 sec. approximately depending on the room volume and sound absorbing materials installed on floor, wall and ceiling and it was revealed that RT at 250㎐ of center frequency range was shortest and RT at 1㎑ was largest as most of the materials applied to finishing were panel absorbers and reflectors such as wood panel, concrete and brick.

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.

성당 음향성능 평가를 위한 어휘조사 및 주관적 반응 조사 연구

박현구,김선우 대한건축학회 2003 대한건축학회논문집 Vol.19 No.5

The buildings of Catholic church in Korea were built about one century ago when the freedom of faith was given, and have had lots of differences with those of western due to application of shape, transformation and change of inner space. The change of inner space brings the room acoustic characteristics modify, which is the reason that we have to look for appropriate evaluation method and design principle different from western one. This study, therefore, has begun as a preliminary step for evaluating of Catholic church's room acoustic performance and surveyed for gathering useful vocabularies and minimizing them. Finally we surveyed the subjective responses through questionnaire to users making use of vocabularies extracted and analysed the independent factors to be used in psycho-acoustic experiment by factor analysis.

휘발성유기화합물(VOCs)의 변이원성 검정

박종천,이용탁,송현철,이우범 國立麗水大學校 環境問題硏究所 2004 環境硏究論文集 Vol.6 No.-

The mutagenicity of six kinds of VOCs(benzene, m.p-xylene, chloroform, toluene, methylethylketone, 1,2-dichloroethane) detected in high concentration and frequency in Kwangyang Bay was investigated. VOCs are water-insoluble and volatile. Therefore, when they are tested by the classical Ames test in the assay of mutagenicity, there may be experimental errors. To overcome this limitation, modified Ames test was used to assay mutagenicity of VOCs. By this modified Ames test, we could obtain much more satisfactory results. Even at extremely low concentration(0.0001㎍/㎖). bezene, m,p-xylene, and methylethylketone showed a weak mutagenicity. When S-9 mixture is added in the assay system, all tested VOCs except methylethylketone showed mutagenicity. When Salmonclla typhimurium TA 98 and Salmonella typhimurium TA 100 are exposed to VOCs of high concentration(100㎍/㎖). the number of colony decreased irrespective of the S-9 mixture treatment. It seem to be that the decrement results from the toxic effect of high concentration of VOCs.

간에서 보이는 직선연 징후의 CT 소견

박성태,이현경,김정혜,이성우 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-

목적 : 전산화단층촬영(CT) 에서 조여증강 전, 후에 간 내에서 관찰되는 직선연 징후(straight border sign)의 그 원인에 따른 영상소견을 알아보고자 한다. 대상 및 방법 : 복부 CT에서 간내에서 직선연 징후를 보이는 9례를 후향적으로 분석하였다. 원인 질환은 간전이, 간세포암, 외상성 간손상이 각각 1례와 간농양, 재발성화농성담도염, 그리고 지방간 각각 2례였다. 결과 : 전이암과 간세포암 각각 1례에서는 종양의 문맥침범으로 인하여 그리고 간농양과 재발성화농성담도염 각각 2례에서는 염증이 있는 간엽으로의 스틸현상에 의해 직선연으로 경계되는 간 엽간의 조영증강의 차이가 있었다. 외상성 간손상 1례에서는 간문맥과 동맥의 손상에 의한 쐐기모양의 간경색이 관찰되었으며 2례의 지방간에는 간우엽에 갠틀리선을 경계로 하는 저음영이 관찰되었다. 결론 : CT 영상에서 간내 직선연 징후가 보일 때 음영의 분포 (해부학적 또는 비해부학학적), 감쇠도(고감쇠 또는 저감쇠), 그리고 조영증가 유무와 그 방법에 대한 지식을 모두 고려하여야 할 것으로 생각된다. Purpose : We demonstrate computed tomography (CT) appearances of straight border sign of liver and correlate with its causes. Material and Methods : We retrospectively reviewed nine cases of abdominal CT scan that showed the straight border sign. Underlying disease were liver metastasis (n=1), hepatocellular carcinoma (n=1), traumatic liver injury (n=1), liver abscess (n=2), recurrent pyogenic cholangitis (n=2), and fatty liver (n=2). Results : Attenuation differences of liver bordered by the straight line were depicted in various conditions. These conditions are the followings : portal vein invasion in case of liver metastasis and hepatocelluar carcinoma ; steel phenomenon in case of liver abscess and recurrent pyogenic cholangitis ; and hepatic artery and portal vein injury in case of traumatic liver injury. Lobar fatty liver lesions were also seen in right lobe bordered by straight line. Conclusion : To correctly interpret the straight border sign, we should consider the distribution (anatomic vs nonanatomic), the attenuation (low vs high), and the use and technique of contrast enhancement.

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.