• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2008년도 추계 공동 국제학술대회
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• pp.643-648
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• 2008

모바일 인터넷 시장의 양적성장에도 불구하고 사용자들은 모바일 인터넷 서비스를 이용하지 않거나 지속적으로 이용하지 않는 것으로 나타났다. 최근 모바일 인터넷 서비스 시장은 요금인하와 풀브라우저의 보급으로 모바일 웹2.0 서비스의 이용자가 증가할 것으로 예측되고, 모바일 비즈니스는 다양한 측면에서 e-비즈니스를 능가하는 영향력을 행사할 것이며, 실시간 인터랙션으로 개인과 기업의 생활과 방식을 변화시킬 것으로 예상된다. 본 연구에서는 분해된 계획행위이론을 연구의 기반으로 하여, 새로운 모바일 웹 서비스의 수용에 영향을 미치는 주요한 요인을 찾고자 한다. 본 연구는 모바일 웹 2.0 서비스의 사용의도에 영향을 미치는 요인을 적합한 모형으로 검증함으로써, 모바일 비즈니스를 수행하고자 하는 기업에게 사용자의 행위에 대한 이해의 폭을 넓히고, 향후 이 분야의 기초자료가 될 것으로 사료된다 연구결과에 대한 이론적 해석과 실무적 시사점이 제공된다.

• 천문학회보
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• 제36권2호
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• pp.67.1-67.1
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• 2011

Recent observations and modeling of globular clusters with multiple populations strongly indicate the presence of super helium-rich subpopulations in old stellar systems. Motivated by this, we have constructed new population synthesis models with and without helium-enhanced subpopulations to investigate their impact on the UV-upturn phenomenon of quiescent early-type galaxies. We find that our models with helium-enhanced subpopulations can naturally reproduce the strong UV-upturns observed in giant elliptical galaxies assuming an age similar to that of old globular clusters in the Milky Way. The major source of far-UV (FUV) flux, in this model, is relatively metal-poor and helium-enhanced hot horizontal branch stars and their progeny. The Burstein et al. (1988) relation of the FUV - V color with metallicity is also explained either by the variation of the fraction of helium-enhanced subpopulations or by the spread in mean age of stellar populations in early-type galaxies.

• 천문학회보
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• 제36권2호
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• pp.54.1-54.1
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• 2011

암흑에너지가 존재한다는 가장 강력한 증거는 Type Ia 초신성을 이용한 먼 은하의 거리측정으로부터 제시된다. 이러한 결론은 경험적인 방법에 의해 표준화 과정을 거친 Type Ia 초신성의 수정된 밝기가 look-back time에 따라 진화하지 않을 것이란 가정에 기초한다. 그러나 최근 이 가정이 합당하다는 증거가 점차 불확실해지면서 Type Ia 초신성의 광도 진화에 대한 검증이 다시 요구되고 있다. 우리는 여기서 Type Ia 초신성의 광도곡선 분석과 호스트 은하의 분광관측으로부터 Type Ia 초신성의 광도진화효과를 규명하기 위해 새롭게 시작한 프로젝트 YONSEI (YOnsei Nearby Supernovae Evolution Investigation)를 소개하고 예비 결과를 논의할 예정이다.

• 천문학회보
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• 제36권2호
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• pp.75.2-75.2
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• 2011

We present a new, year 2011 version of the Yonsei Evolutionary Population Synthesis (YEPS 2011) model for simple stellar populations. The standard YEPS employs the most up-to-date Yonsei-Yale stellar evolutionary tracks and the BaSeL flux libraries. The spectro-photometric model data of the entire parameter space are available at http://web.yonsei.ac.kr/cosmic/data/YESP.htm.

• 한국환경교육학회지:환경교육
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• 제17권1호
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• pp.122-132
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• 2004

The present study is to investigate the middle school students' worldview and consciousness about the environment. To conduct this study, 605 students from the two middle schools of Daegu metropolitan area, seventh grade, were measured using a modified version of New Environmental Paradigm (NEP) instrument and qustionnaire of environmental consciousness. The results are as follows: First, a majority of middle school students held an ecological environmental worldview. They also had a similar environmental worldview to education experience on environment-related to subjects. The strongest area of agreement with the NEP were in the "Negative results of growth and technology." The weakest area of agreement with the NEP were in the "Quality of life" dimension with only 44.9 percent agreement across that dimension's four statements. Second, the middle school students are sensible of consciousness in environmental problems. They pointed out that air pollution and noise are the most as sever problems in country and local area, respectively. Finally, the subjects who showed the higher environmental worldview had a higher environmental consciousness and better attitudes related to environmental problems.

• Journal of Chest Surgery
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• 제27권1호
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• pp.31-35
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• 1994

Dissecting aortic aneurysm is a life threatening condition which necessitates prompt diagnosis and management. Between January 1987 and September 1993,58 patients was admitted to our department. Mean age at admission was 53 years.[range 25-82]. Clinical findings included chest pain in 48 cases[83%],renal failure in 12[20%],aortic insufficiency in 11[19%] and stroke in 9[15%]. Predisposing factors were hypertension in 50 cases[86%],Marfan`s syndrome in 6[10%] and diabetes melitus in 1 [2%]. 23 patients[ type A 13,type B 10 ] underwent surgical treatment. Surgical technique for type A included graft replacement of ascending aorta in 7 cases,graft replacement and aortic valve resuspension in 3,and Bentall`s operation in 3 cases. Type B patients were operated when specific indications applied. There were three [Two in type A and 1 in type B] deaths in the operation group and nine [ 5 in type A and 4 in type B] deaths in the medical group. These results support our current policy in the treatment of dissecting aortic aneurysm.

• 한국환경교육학회지:환경교육
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• 제22권3호
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• pp.112-124
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• 2009

Visual images are important elements of the communication of environment in secondary school environment textbooks, which dominate classroom approaches to teaching and learning. This study was to analysed the perspectives of pedagogical and social-pedagogic of visual images in 'global warming' unit of six different Korean environment textbooks. Analysis makes use of the dimensions pedagogical functions, content specialization, social-pedagogic relationships, and abstraction of the visual codes. The results showed that most of the visual images in school environment textbooks tend to establish social-pedagogic relationships with students. The results of our study have implications for textbook authors and secondary environment teachers. We suggest that future studies may focus on students' and teacher's interpretation of visual images new secondary environment textbooks.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2000년도 가을 학술발표논문집 Vol.27 No.2 (3)
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• pp.387-389
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• 2000

최근에 제안된 멀티캐스트 프로토콜인 REUNITE는 규모 확장성(scalability) 문제를 해결하고 새로운 주소 배정(addressing) 방식을 도입하였다[1]. 그러나 REUNITE는 많은 IP Lookup 작업을 필요로 하는 문제를 갖는다. REUNITE에서는 라우터로 들어오는 패킷이 멀티캐스트 패킷인지 유니캐스트 패킷인지를 구별하지 않는다. 따라서 어떤 패킷이라도 REUNITE를 지원하는 라우터를 들어오게 되면 부가적인 테이블 Lookup 과정을 수행하게 된다. 본 논문에서는 라우터에서 멀티캐스트 패킷을 구별하여 기존의 유니캐스트 패킷의 전송속도에는 영향을 미치지 않게 하였고, 멀티캐스트 패킷의 경우에도 branching 노드간에 형성된 터널을 통해 branching 노드에서만 테이블 Lookup 작업을 수행하도록 하였다.

• 한국환경교육학회지:환경교육
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• 제24권1호
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• pp.76-87
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• 2011

The purpose of this study was to investigate middle school students' perceptions about global environmental problems using drawings. The study was involved the collection of drawing data from 112 ninth grade students from a middle school in Daegu Metropolitan City. The environment task was administrated to students drew a drawing of an global environmental problems and explained their drawing in their own words. Also, students was asked to write what he or she can do to solve global environmental problems. The results are as follows: First, air pollution is the most important global environmental problem, followed by water pollution, global warming, sea level rise, deforestation, waste, loss of biodiversity, and so on. Second, the students' drawings were characterized into two aspects: One is a macroscopic viewpoint and the other is everyday viewpoint. Third, the students' practical action plan to do solve global environmental problems were walk, public traffic, do not throw trash, plant trees, etc. Educators should take into account the perceptions of global environmental problems and teaching-learning strategies to enhance students' understanding of global environment.

• 한국환경교육학회지:환경교육
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• 제21권2호
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• pp.68-79
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• 2008

This study investigated undergraduate students' perceptions and mental models of the environment. A total of 192 students were sampled from a university of Gyoungbuk area. The environmental task was administrated to students drew a picture of an environment and explained their drawing. The results are as follows: First, a majority of undergraduate students perceived an environment from a comfortable environment. Second, five mental models emerged from a content analysis of students' responses about environmental drawing. Third, the dominant model was mental model 4, the environment as a place where animals, plants, and humans live. This means that the majority of students perceived a 'relation' rather than 'objects' views of the environment. Therefore, undergraduate students' conceptualizations about environment depends on a view or mental models of the environment which places humans in a sustaining relationship with the environment and its natural resources. The implications of these findings for environmental education are discussed.