통계적인 경계조건이 마그네슘합금 AZ31의 피로신뢰성에 미치는 영향

최선순(Seon Soon Choi),이억섭(Ouk Sub Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

The fatigue crack propagation is stochastic in nature, because the variables affecting the fatigue behavior are random and have uncertainty. In this study, fatigue experiments are conducted on the specimens of magnesium alloy AZ31 for varying boundary conditions having different statistical characteristics. The effects of these varying boundary conditions on the fatigue failure life are systematically investigated. The reliability estimation for these fatigue failure lives is also performed.

특집 : 진용(眞容): 인도 보드가야 항마촉지인 불좌상에 대한 중국 당대(唐代) 불교도들의 인식과 수용

최선아 ( Sun Ah Choi ) 미술사와 시각문화학회 2009 미술사와 시각문화 Vol.8 No.-

This paper examines religious and cultural contexts in which Chinese Buddhists in late seventh century designated the Vajrasana Buddha statue enshrined at Mahabodhi Temple in Bodh Gaya, India as "true visage." Initiated by the observation that the term "true visage," or zhenrong 眞容 was rarely used as a direct designation of religious icons in earlier period, this article tries to investigate following questions: why was the Buddha image in India called such a special name? What did the term, the "true visage" exactly mean? What were the implications of the term, particularly when it was used in relation to a Buddhist image? In order to answer these questions, this paper, first of all, closely reads textual sources relevant to the statue including Xuanzang`s Da Tang xiyu ji, Wang Xuance`s travelogue quoted in Fayuan zhulin, and Yijng`s Da Tang qiufa gaoseng zhuan. This close reading of the pilgrimage records reveals the courses through which the image obtained such a special name in late seventh century. Referring to the statue as true visage was a particular phenomenon closely related to Yijing, whereas Xuanzang and Wang did not name the image with such a special word. As a way of searching for the exact meaning of the term, the second part of this paper turns to an investigation of literary sources of earlier period. In particular, analysis of dedicatory inscriptions of the fifth and sixth centuries where the term frequently appears in the context of explicating the ontological status of religious icons reveals that the word originally denoted now-disappearing, thus invisible form of Buddha. Based on this observation, the next part of this paper discusses what it means to name the statue as true visage, and how such a phenomenon is related the issue of the reception of religious icons. Contrasting different attitudes toward the statue between Xuanzang presented in his biography and other pilgrim monks described in Yijing`s record, I suggest that changed reception of the statue-from the one which evokes the sense of absence to the one which represents, thus replaces the absent Buddha―underlay in the phenomenon of naming the statue as the true visage. Lastly, this paper illustrates how an examination of relevant visual materials reveals another intriguing aspect in the reception of the Vajrasana Buddha image in China, when they were illuminated in contrast to textual sources. Reminding of the fact that some of Chinese images made modelled after the Bodh Gaya statue in late seventh century were named as "Miraculous Image of Bodhi Tree" in their inscriptions, I suggest that the materiality of the image was still emphasized in the course of making replications, whereas the original image at the site was gaining an elevated existential status almost identical to its divine prototype. Furthermore, the fact that the statue was received as a miraculous image might present an important clue to the iconographic discrepancies between the original and copied derivatives, an issue which has long intrigued scholars over the past few decades.

남녀 대학생의 생활환경과 건강행태 및 삶의 질 간의 관계

최선하(Choi Sun-Ha),안영미(Ahn Young-Mee),임미영(Im Mi-Yeong) 한국생활환경학회 2016 한국생활환경학회지 Vol.23 No.1

The living environment, health behavior and quality of life (QOL) were compared between 321 male and 342 female Korean college students. The life-environment consisted of the biological aspects (gender, age, body mass index, sleeping duration, perceived physical types and health status), the habitat environment (resident types and cohabit members) and social environment such as eligibility of medical care. The results showed that there were gender differences in various aspects of life-environment; particularly, the association of life-environment to health patterns and QOL seemed to be complicated in females, indicating that enhancing self-empowerment skill may be more effective strategy of health management in females, rather a single solid intervention compared to male students.

풍수해 예측을 위한 신경망 모델

최선화(Seonhwa Choi) 한국정보과학회 2011 정보과학회논문지 : 소프트웨어 및 응용 Vol.38 No.3

국지성 호우 및 대규모 태풍과 같은 풍수해는 우리나라에 가장 많은 피해를 유발하는 재해로 기후온난화를 통해 그 피해가 더욱 가속화되고 있다. 따라서 풍수해 발생가능성을 미리 예측하여 선제적으로 대응하기 위한 노력과 연구가 필요하다. 재난?재해의 위험성 분석 방법은 주로 확률?통계기법에 기반한 수식모델 연구가 주류를 이루었으나, 본 논문에서는 경험적 패턴인식에 탁월한 성능을 가진 신경망 알고리즘을 활용하여 풍수해 예측모델을 생성하였다. 1991년부터 2005년 사이에 우리나라에서 발생한 풍수해 자료와 기상개황 자료를 이용하여 우리나라 232개 행정구역에 대하여 누적강우량과 최대풍속, 재해사상 발생 5일 이내의 선행강우량, 그리고 지역의 풍수해 발생 영향요인이 되는 특징을 정의하여 입력변수로 하고 총 피해액을 출력변수로 하였다. 학습, 검증, 평가 데이터는 6:3:1로 랜덤 분할?생성하여 각각 5세트로 생성하고 모델마다 학습, 검증, 그리고 평가를 5번 반복 수행하였다. 풍수해 예측을 위한 최적의 모델을 찾기 위해 신경망의 초기 가중치, 은닉층의 노드수, 모멘텀, 학습률을 다양하게 변화시켜 약 8천여개 모델을 학습하였으며 검증 데이터를 이용하여 모델의 정확도(accuracy)와 ROC(Receiver Operating Characteristic) 공간상의 TPR(True Positive Rate)과 FPR(False Positive Rate)의 분포로 최적모델 후보들을 선택하였다. 후보모델들을 평가 데이터에 적용하여 정확도와 TPR, FPR을 비교하여 풍수해 예측을 위한 최적모델을 결정하였다. Storm and flood such as torrential rains and major typhoons has often caused damages on a large scale in Korea and damages from storm and flood have been increasing by climate change and warming. Therefore, it is an essential work to maneuver preemptively against risks and damages from storm and flood by predicting the possibility and scale of the disaster. Generally the research on numerical model based on statistical methods for analyzing and predicting disaster risks and damages has been mainstreamed. In this paper, we developed the model for prediction of damage cost from storm and flood by the neural network algorithm which outstandingly implements the pattern recognition. Using the damage data of storm and flood and meteorological data from 1991 to 2005 in Korea, we made data sets and defined the accumulated rainfall, the maximum wind speed, the antecedent rainfall within 5 days before being disasters, and the regional feature representing the influence factors on the outbreak of damages from storm and flood as input variables for learning the model. Also we defined the total amount of damages as an output variable. Creation of a holdout which was created by randomly partitioning into train, validation, and test data in the ratio of 6:3:1 respectively was repeatedly processed by 5 times. For finding the optimal model, first of all, we learned about 8,000 models initialized by combinations of the architectures: initial weight and the number of nodes in a hidden layer, and learning parameters: momentum and learning rate of a neural network model. Next, we selected the candidate models for an optimal model among the learned models according to the accuracy and TPR and FPR on ROC graph. Finally, we decided the optimal model for predicting damage cost from storm and flood among the candidate models according to the accuracy and TPR and FPR on ROC graph obtained using test data.

부동 상태의 급성 뇌졸중 중환자의 근육량 변화

최선임 ( Sun Im Choi ),박혜자 ( Hye-ja Park ) 한국보건정보통계학회(구 한국보건통계학회) 2020 보건정보통계학회지 Vol.45 No.1

Objectives: This study examined the body muscle and limbs muscle loss among critically ill patients with acute stroke. Methods: In this cross-sectional study, the clinical characteristics, lean body muscle and limbs muscle were measured on admission day, the 2nd day and the 7th day after admission in 23 acute stroke patients recruited from at a tertiary neuroscience intensive care unit. Immobilization was defined by medical research council score (MRCs≤48) and Richmond agitation and sedation score (RASS≤-2). Data were analyzed by repeated measures of ANOVA with Bonferroni’s correction and rank ANCOVA. Results: Most clinical indices were improved on the 2nd day. The muscle loss incidence of lean body muscle, upper limb and lower limb was 65.2%, 56.5%, and 73.9% on the 7th day, respectively. Lean body muscle reduced by 1.05% at the 2nd day and by 1.45% at 7th day. Upper and lower limbs muscle reduced by 3.34% and 3.53% at 7th day, respectively. Conclusions: Immobilization may lead to muscle loss in acute stroke patients. An early mobility program may help prevent muscle loss for immobilized acute stroke patients at the neuroscience intensive care unit.

장애인복지관 종사자가 지각하는 직무만족도에 관한 연구

최선경(Choi, Sun Kyoung) 동국대학교 사회과학연구원 2015 사회과학연구 Vol.22 No.4

장애인복지 현장은 일반 사회복지 현장과 달리 장애인 당사자의 복잡다단한 상황에 적합한 서비스를 생애주기별로 제공해야 하기 때문에 많은 전문지식과 행정능력이 요구되곤 한다. 따라서 높은 직무만족도는 서비스의 질과 직접적 연관을 맺게 된다. 이 연구는 부산시에서 장애인을 대상으로 서비스를 제공하는 장애인복지관 종사자를 대상으로 직무만족도와 직무스트레스, 대처방식, 자아수용, 대인관계의 상관관계를 파악하고자 하였다. 연구 결과 자아수용과 대인관계는 직무만족과 상관관계가 없으며 직무스트레스와 대처방식은 각각 부적, 정적으로 상관관계를 나타내었다. 이를 토대로 직무만족도를 강화시킬 수 있는 방안을 제시하고자 하였다. The field where welfare services are provided to the disabled requires much more specialized knowledge and administrative skills than the general field of social welfare because it should provide the disabled with services appropriately to the complicated situations and their life cycle. This may increase the workers’ job stress, and their job satisfaction is directly associated with the service quality. This study targets social workers working at welfare centers for the disabled providing services for the disabled in Busan City to figure out variables influencing their job satisfaction. According to the findings, self-acceptance and interpersonal relationship are not correlated with job satisfaction, and job stress and coping skills have negative and positive correlation respectively. This author intended to suggest ways to enhance their job satisfaction based on that.

통가 TA25 해저산 칼데라 해저열수 분출구의 광석광물 산상 및 유체포유물 연구

최선기,이경용,박상준,최상훈,이인경,Choi, Sun Ki,Lee, Kyeong-Yong,Pak, Sang Joon,Choi, Sang-Hoon,Lee, In-Kyeong 대한자원환경지질학회 2015 자원환경지질 Vol.48 No.4

통가화산호의 TA25 해저산 서측에서는 열수광체가 처음 발견되었다. 이 지역에 분포하는 열수분출구들은 열수분출이 막 시작된 미성숙한 분출구로서 최저 $150^{\circ}C$에서 최대 $242^{\circ}C$ (평균: $203^{\circ}C$)의 열수온도를 보인다. 주요 황화광물로는 섬아연석, 황철석, 백철석, 방연석, 황동석, 코벨라이트, 비사면동석(tennantite), 황비동석(enargite)이 산출되며, 중정석, 석고/경석고 등의 황산염 광물들이 침니 외각에서 산출된다. 특히, 섬아연석이 높은 산출빈도를 보이는 아연 우세형 (Zn-rich) 광체로 분류된다. 광석광물 중 황비동석의 산출은 이 지역 열수분출구의 광화작용이 고유황형 환경에서 진행되었음을 시사한다. 섬아연석은 열수분출구의 외각부에서 내측부로 갈수록 산출빈도가 증가하며, 섬아연석 내 철함량 (mole% FeS)도 높아진다. 또한, 이들 섬아연석은 은 (~10 wt.%)을 함유하고 있는 특징을 보인다. 황동석은 침니에 비해 광체구에서 높은 산출빈도를 보여, 침니와 비교하여 광체구에서 다소 고온의 광화작용이 진행된 것으로 판단된다. 열수분출구 구성광물 중 광체구에서 산출되는 중정석을 대상으로 한 유체포유물 실험 결과, 균일화 온도 및 염농도는 $148^{\circ}C{\sim}341^{\circ}C$ (평균: $213^{\circ}C$) 및 0.4~3.1 equiv. wt.% NaCl를 보여 섬아연석 등 광석광물의 주된 광화작용이 약 ${\geq}200^{\circ}C$에서 진행된 것으로 확인되며, 동광화작용이 미약한 침니에서는 보다 낮은 온도에서 광화작용이 진행되었던 것으로 판단된다. The extensive hydrothermal deposits have been found, for the first time, on the western TA25 seamount caldera in the Tonga arc. The seafloor hydrothermal vents are active and immature, emitting the transparent fluids of which temperatures range from $150^{\circ}C$ to $242^{\circ}C$ (average=$203^{\circ}C$). The recovered hydrothermal sulfides are mainly composed of sphalerite, pyrite, marcasite, galena, chalcopyrite, covellite, tennantite, enargite and sulfates such as barite, gypsum/anhydrite. Predominant sphalerite categorize it into Zn-rich hydrothermal ore body. Zn-rich sulfide ores have minor enargite, indicating that mineralization occurred in high sulfidation environment. The proportion and FeS content of sphalerite increase from outside to inside of the hydrothermal ores, respectively. In particular, sphalerite has a great silver content (up to ~10 wt.%). Chalcopyrite is more frequently observed in mound than in the chimney, implying mineralization temperature in the mound is higher than in the chimney. Homogenization temperatures and salinities from fluid inclusions in barite at the mound range from $148^{\circ}C$ to $341^{\circ}C$ (average=$213^{\circ}C$) and 0.4 to 3.6 equiv. wt.% NaCl, respectively. Homogenization temperatures suggest that sulfides in the mound mineralized at a higher temperature (${\geq}200^{\circ}C$) than in the chimney.

바이마르 공화국 실업보험법(AVAVG)의 성과와 한계

최선아(Choi Sun-Ah) 호서사학회 2003 역사와 담론 Vol.36 No.-

그림책을 활용한 철학적 탐구공동체 활동이 유아의 정서능력에 미치는 영향

최선경 ( Sun Kyung Choi ),정대련 ( Dae Ryun Chung ) 한국어린이문학교육학회 2015 어린이문학교육연구 Vol.16 No.2

본 연구의 목적은 2013년 11월부터 2014년 2월까지 서울시 강동구에 위치한 국공립 G 어린이집의 4-5 세 유아 67명을 대상으로 하여 그림책을 활용한 철학적 탐구공동체 활동이 유아의 정서능력에 미치는 영향을 알아보는 데 있다. 유아 정서능력의 6개 하위요인, 즉 자기정서 인식 및 표현, 감정 조절 및 충동억제, 자기정서의 이용, 타인정서 인식 및 배려, 교사와의 관계, 또래와의 관계 능력 등의 측면에서 살펴본 결과, 실험집단과 비교집단 간에 통계적으로 유의미한 차이가 있는 것으로 나타났다. 이는 그림책을 활용한 철학적 탐구공동체 활동이 유아의 정서능력에 긍정적인 영향을 준 것으로 해석되는 바, 차후 그림책을 활용한 철학적 탐구공동체 활동이 유아교육 기관에서 정서능력 향상을 위한 교육 프로그램의 하나로서 역할 할 수 있는 가능성을 보였다고 할 것이다. The purpose of this study is to apply young children``s activities at a community of philosophical inquiry using picture books related to the living themes in Nuri-program designed by the Korean Ministry of Education, and then provide a foundation of effective children’s book activity materials applicable to young children’s educational institutions through research results about the effect of these activities on the emotional competence. Thus, as research subjects, this study selected 67 4 to 5-year-old children at a preschool in Gandong-gu, Seoul and conducted an experiment and analyzed the results of this experiment. As young children’s emotional competence factors, there were self-emotion perception and expression, emotional control and impulse suppression, use of self-emotions, recognition and consideration of other``s emotions, relationship with teachers and relationship with peers. The results showed that there were statistically significant differences between the experimental and comparative groups. It may be interpreted that the community of philosophical inquiry activity using picture books enhanced 4 to 5-year-old children``s emotional competence. Based on the results of this study, it is expected that ‘Activities at a Community of Philosophical Inquiry using Picture Books’ will be used as a part of the educational program for young children at educational institutions to improve young children’s emotional competence.

보문 : 포스트모던 패션광고에 대한 반응과 광고효과

최선형 ( Sun Hyung Choi ) 韓國衣類學會 2008 한국의류학회지 Vol.32 No.2