• Journal of the Korean earth science society
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• v.25 no.8
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• pp.708-718
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• 2004

On the basis of Sternberg's theory of mental self-government, this examined the difference in thinking style between gifted science students and non-gifted students, and their earth science concepts by the different types of thinking styles. The subjects were consisted of 120 students from the Busan Science Academy and 122 students from two general high schools in Busan, Korea. All participants responded to the Thinking Styles Inventory which is a self-report test consisting of 65 items, and essay questions for examining the students' earth science concepts. The results are as follows. First, the gifted science students prefer legislative, judical, anarchic, global, and liberal styles, where non-gifted students prefer executive, oligarchic, and conservative styles. Second, Type I thinking style group prove to have more complex concepts in relation to the geological and astronomical areas than those of the Type II thinking style group in both of the gifted and non-gifted students. This indicates that Type I thinking style students use a deep learning approach where Type II thinking style students use a surface learning approach.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.25 no.10
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• pp.959-965
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• 2014

This paper summarizes the previous research results of fundamental investigation done in SNU on the wireless power transfer. Firstly, the physical limitation of a wireless power transfer using the spherical modes is reviewed. It is found that wireless power transfer depends only on the radiation efficiency of the antennas and the distance between two antennas involved. Secondly, we review the characteristics of WPTS with different sources and compare the performance differences of WPTS according to the source type. In addition, the method for efficient WPTS is suggested when the distance between antennas is varied. Finally, by using the time domain solution of the coupled mode equation, we present an analytic formula which can be used to differentiate Inductive Coupling(IC) and Magnetic Resonance Coupling(MAC) which are often used ambiguously in wireless power transfer system.

• Journal of Information Technology Services
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• v.17 no.1
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• pp.121-134
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• 2018

Massive Open Online Course (MOOC) is online education that anyone can register for free and has internet access. MOOC is also called Education Revolution and is spreading rapidly all over the world. Although recent MOOC high-quality classes may enhance the value of MOOC, MOOC learning still needs much research. Since MOOC has low learning completion rate and continuous use rate, various studies on the reasons that learners give up at the beginning of learning have not been tried yet This research is studied for the continuous intention of use of MOOC applying self-determination theory and learning flow theory based on technology acceptance model. In particular, the research are conducted for cultural difference in continuous usage of MOOC between Korean and Chinese. The research results show that self-determination theory applying perceived autonomy, perceived competence, and perceived relatedness and learning flow is useful to explain continuous use of MOOC. The research also shows that Hofstede theory works well in explaining the cultural difference between Korea and China in continuous usage of MOOC. The result shows that korean is more influenced by perceived external motivation like perceived usefulness and chinese is more influenced by internal motivation like learning flow in continuous use of MOOC.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.101-105
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• 2011

공유하천의 물 배분문제는 이해당사자간 입장차이가 뚜렷하여 일관된 해결책을 찾기가 어려운 과제이다. 따라서 문제해결을 위한 접근방법이나 적용하고자 하는 논리와 원칙이 일방적일 수 있으며, 연안국가간 서로 상반되는 논리를 주장하는 것이 대부분이다. 즉 어떤 국가든 자기에게 가장 유리한 입장을 취하게 되며 상대방의 주장에 동조하는 자세는 자국 내에서 큰 비판에 직면할 수 있다는 정치적 부담이 있다. 결국 각각의 연안국가들은 자기에게 가장 유리한 이론과 논리를 내세우게 되며 타협과 협력에 도달하기 위해서는 수문, 기상, 사회, 문화, 경제 및 정치적 문제를 극복해야 한다. 본 연구에서는 남북공유하천의 공평하고 합리적인 이용방법을 제시하기 위하여 이해관계가 복잡한 하류유역의 수리권을 추정하였다. 이를 위해 국제 공유하천에서 수리권 배분을 위한 표준화된 법칙이 없으므로 과거 사례 분석을 통해 해석방법을 찾고자 하였다. 아울러 현재 남북공유하천의 문제점을 진단하고 국제사례를 통해 하류국가인 남한지역에 기득수리권이 존재함을 증명하고자 하였다. 또한 수리권 배분(북한의 임남댐 보장방류량)을 위해 국제적으로 적용된 사례와 이의 평가기준 등을 고려하여 남북공유하천에 적용하고자 하였다.

• 한국정보교육학회:학술대회논문집
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• 2008.01a
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• pp.263-268
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• 2008

학교의 학습 과정에 있어서 학습자 간의 학습 능력의 차이는 존재하며 이를 해결하기 위해 교육과정에서는 개별 학습과 수준별 학습을 권장한다. 유무선 인터넷을 통한 수준별 학습은 최근에 많은 연구가 되고 있는 u-러닝(Ubiquitous Learning) 환경에도 부합하며 학습자 개개인이 자신의 속도와 수준에 맞게 자기주도적으로 학습을 하기에 알맞은 방법이라 할 수 있다. 이에 본 연구에서는 학습자가 시간과 공간에 구애받지 않고 자율적으로 수준에 맞게 학습할 수 있는 수준별 학습 시스템을 설계하였다. 특히 시스템에 체계성을 더하기 위해 개별화 학습 체제 중에서 과거 많은 연구를 통해 그 효과성이 입증된 Keller의 PSI(Personal System of Instruction) 이론을 활용하여 시스템의 각 과정을 설계하였다. 본 시스템의 장점은 다음과 같다. 첫째, 학습자가 원하는 시간과 공간에서 자신의 속도에 맞게 학습할 수 있으므로 자기주도적인 학습 능력을 기를 수 있다. 둘째, 시스템 구성상 평가를 통해 일정한 기준에 미달하면 목표에 도달할 때까지 계속 학습하고 도전해야 하므로 궁극적으로 완전학습에 도달할 수 있다. 셋째, 제한된 교실 상황에서 벗어나 온라인에서의 학습 지원이 가능하므로 학습자의 개인차에 따른 수준별 학습을 관리하고 책임져야 하는 교사의 부담을 덜어준다.

• Korean Journal of Legislative Studies
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• v.17 no.3
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• pp.171-195
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• 2011

2007년 일본최고 재판소는 히로시마시 폭주족 추방조례사건에 대하여 헌법판단 회피의 이론에 입각한 합헌적 한정해석론에 따라 합헌결정 판결을 내렸다. 이는 기존의 판결내용을 답습한 것에 불과 하였지만 합헌적 한정해석이라는 헌법해석의 방법론에 관한 의미를 한번 되새기는 계기가 된 사건이다. 이 법리에 의한 것으로는 1980년대의 청소년보호조례사건이 유명하다. 이 두 사건은 하나는 공안사건이고 다른 하나는 풍속에 관한 사건이라는 점에서 차이가 있다. 폭주족 추방조례사건은 합헌적 한정해석의 법리가 적용될 여지가 있다고 보이지만 청소년보호조례사건과 같은 풍속에 관한 사건에서는 이 법리를 적용하는 것은 무리라고 생각된다. 왜냐하면 청소년보호조례사건에서는 음행, 난잡한 성행위라는 너무나 막연하고 애매한 개념을 사용하고 있어 형사절차에서의 대 원칙인 죄형법정주의에 위배될 소지가 있으며 성적 자기결정의 자유를 규제할 때에는 이에 따른 필연적인 이유가 존재해야 함에도 그렇지 못하다는 문제점과 일반국민에게 지나친 심리적 위축을 초래할 수 있다는 점에서 위헌논란이 제기되었다. 그럼에도 일본 최고재판소는 이를 합헌적 한정해석의 법리를 원용하여 위헌선언하기를 꺼려온 바 이는 헌법판단회피를 의도적으로 하는 것으로 지나친 사법소극주의적 태도라고 하지 않을 수 없다. 법원은 사건의 중대성이나 위헌상태의 정도 그 파급효과의 범위, 구체적 사건에서 문제가 되고 있는 권리의 성질등을 종합적으로 고려해서 충분히 이유가 있다고 판단되는 경우에는 헌법판단회피의 준칙에 따르지 않아야 하며 헌법판단을 적극적으로 할 수 있다고 해석하는 것이 타당하다고 생각된다.

• Journal of the Korean Magnetics Society
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• v.10 no.5
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• pp.196-202
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• 2000

Top synthetic spin valves with structure Ta/NiFe/CoFe/Cu/CoFe(P1)/Ru/CoFe(P2)/FeMn/Ta on Si(100) substrate with natural oxide were prepared by dc magnetron sputtering system, and investigated on the magnetoresistance properties and effective exchange bias field. As the thickness of FeMn increased above 150 $\AA$, MR ratio was decreased due to the current shunting effect. As the thickness of free layer decreased below 40$\AA$, MR ratio was reduced rapidly. In case of 40 $\AA$ thick of free layer, spin valve film with a structure Si(100)/Ta(50 $\AA$)/NiFe(27 $\AA$)/CoFe(13 $\AA$)/Cu(26 $\AA$)/CoFe(30 $\AA$)/Ru(7 $\AA$)/CoFe(15 $\AA$)/FeMn(100 $\AA$)/Ta(50 $\AA$) exhibited maximum MR ratio of 7.5 % and an effective exchange bias field of 600 Oe, respectively. Thickness difference dependence in this synthetic spin valve structure on effective exchange field was investigated and interpreted by the analytical method. It should be noted that thickness increase of CoFe(P 1) and decrease of CoFe(P2) in synthetic antiferromagnet leaded to the decrease in effective exchange bias field by experimentally and analytically.

• Journal of the Korean Society of Food Science and Nutrition
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• v.39 no.1
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• pp.146-153
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• 2010

The objectives of this study were to explore food-related lifestyle segments of the older consumers, to identify its socio-demographic characteristics, and to investigate the differences in variables regarding health beliefs. A survey was conducted of adults 55 years of age and older living in Seoul, South Korea from March 28 to April 10, 2007. Out of the 500 distributed questionnaires, 361 were retained for final analysis: a response rate of 72.2%. As a result of cluster analysis, five consumer segments were identified; health-managing group, diet-unconcerned group, convenience-oriented group, taste-oriented group, unpracticed group. Significant differences were found among the five segments in terms of socio-demographic characteristics and variables regarding health beliefs (i.e., perceived self-efficacy, perceived barriers, perceived benefits). In the health-managing group and taste-oriented group, mean scores of perceived self-efficacy (p<0.001) and perceived benefits (p<0.001) were significantly higher than other groups. However, in the diet-unconcerned group and convenience-oriented group, the mean scores of perceived barriers (p<0.01) were significantly high. This study shows that foodservice operators targeting the older consumers should consider characteristics of each segment to develop a customized program.

• Tunnel and Underground Space
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• v.28 no.6
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• pp.596-608
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• 2018

As urban infrastructure is aging, the possibility of accidents due to the failures or breakdowns of infrastructure increases. Especially, aging underground infrastructures like sewer pipes, waterworks, and subway have a potential to cause an urban ground sink. Urban ground sink is defined just as a local and erratic collapse occurred by underground cavity due to soil erosion or soil loss, which is separated from a sinkhole in soluble bedrock such as limestone. The conventional measurements such as differential settlement gauge, inclinometer or earth pressure gauge have a shortcoming just to provide point measurements with short coverage. Therefore, these methods are not adequate for monitoring of an erratic subsidence caused by underground cavity due to soil erosion or soil loss which occurring at unspecified time and location. Therefore, an alternative technology is required to detect a change of underground physical condition in real time. In this study, the feasibility of a novel magnetic resonance based monitoring method is investigated through laboratory tests, where the changes of path loss (S21) were measured under various testing conditions: media including air, water, and soil, resonant frequency, impedance, and distances between transmitter (TX) and receiver (RX). Theoretically, the transfer characteristic of magnetic field is known to be independent of the density of the medium. However, the results of the test showed the meaningful differences in the path loss (S21) under the different conditions of medium. And it is found that the reflection coefficient showed the more distinct differences over the testing conditions than the path loss. In particular, input reflection coefficient (S11) is more distinguishable than output reflection coefficient (S22).

• The Journal of the Korea Contents Association
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• v.11 no.10
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• pp.396-404
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• 2011

With increasing of smartphone users various smartphone studies have been carried out. The purpose of this paper is to examine the factors influencing the usage intention of smartphone healthcare application. The influencing factors found from literature reviews on Technology Acceptance Model and the diffusion of innovations theory are user interface design, self-efficacy, innovativeness, and entertainment. Survey is conducted to 220 people in Seoul metropolitan area. The survey results are analyzed regarding the difference for the intention of healthcare application in accordance with respondents' demographic and application usage characteristics. We also examine the difference among four influencing factors by users and non-users. As a result there are significant differences in self-efficacy and innovativeness. This gives some implications to application developers: the system should be easy to use and provide new and useful health contents that can attract early-adopters' attention in order to increase the number of application users.