• 항공우주시스템공학회지
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• 제14권6호
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• pp.68-73
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• 2020

Skin-stringer structures are widely used in aircrafts due to their advantage of minimizing structural weight while maintaining load carrying capacity. However, buckling load can cause serious damage to these structures. Therefore, the buckling characteristics of skin-stringer structures should be carefully considered during the design phase to ensure structural soundness. In this study, finite element method was applied to predict the buckling characteristics of stiffened panels. In terms of the failure mode, finite element analysis showed a symmetrical buckling mode, whereas an asymmetrical mode was determined by experimentation. The numerical results were obtained and compared to the experimental data, showing a difference of 9.3% with regard to the buckling loads.

• 대순사상과 동아시아종교
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• 제3권1호
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• pp.57-85
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• 2023

The politico-economic waives of Western imperialism and colonialism, along with Christianity, affected East Asia's geopolitical landscape in the nineteenth and twentieth centuries. While the Korean people (of the Joseon Dynasty) witnessed the incompetence of Buddhism, Confucianism, and folk religions in maintaining social cohesion with a sense of frustration, the new religious movements (NRMs) emerged to provide altrnative teachings of hope through historical figures like Choe Je-u, Kang Il-sun (or Kang Jeungsan), Na Cheol, and Pak Chungbin. In terms of popularity, colonial Korea (1910-1940) was impressed by the native groups of Cheondogyo (=Donghak), Bocheongyo, and Mugeukdo. Son Byong-hee (1861-1922) was the third leader of the first Korean NRM, but both Cha Gyeong-seok (1880-1936) and Jo Cheol-Je (= Jo Jeongsan) (1895-1958) participated in the post-Jeungsan grassroots movements. How, then, did both of these new religions originate? How did they conceptualise their deities and interpret their teachings differently? What was their policy for national independence? The article explores the socio-religious leaders, historical origin, organizational structure, deities, teaching and doctrines, patriotism, and conflicts of both NRMs in a comparative context. As such, this article argues that they both maintained patriotic characteristics, but that Cha's Bocheongyo community with its ' 60-executives' system (60 bang) failed to manage their internal conflicts effectively. Meanwhile, Jo Cheol-Je of Mugeukdo had the charismatic leadership needed to maintain Mugeukdo, despite being seen as a pseudoreligion under the colonial pressure of Shintoism.

• Architectural research
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• 제16권3호
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• pp.109-120
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• 2014

South and North Korea, the divided nations on the Korean peninsula, began with the same modern city planning system, but following the adoption of different national ideologies-capitalism and socialism-, they established their own city planning system and developed their cities accordingly. However, the process of planning and developing a joint city of Kaesong Industrial Complex (KIC) led to the recognition about the need to bridge the differences and prepare for future joint development. This study examines North Korea's city planning system by comparing the two Koreas' systems, and identify the characteristics of North Korea's city planning system through a case analysis of the KIC. By comparing two cases, we found two distinct characteristics of North Korea's. The one is a tool for realizing ideologies and maintaining national system. The other one is that it is ideology-oriented system for the supreme leader and party while South Korea has control-oriented system for the public. We analyze the KIC case based on four pillars: planning system, development system and procedure, master plan, and use behaviors. Result of analysis shows that in KIC there are many socialistic features as we mentioned above in terms of planning system, urban design & structure, and use behavior even though a private enterprise-Hyundai Asan, in South Korea led the whole process. This study is meaningful in that it identifies the specific characteristics of North Korea's city planning focusing on the KIC and is expected to serve as a baseline material to set the future direction for North Korea's development.

• 비교문화연구
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• 제27권
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• pp.291-317
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• 2012

Until now, the 'Ie' system, the distinct Japanese Family system, was dominantly recognized as the vestige of former feudal system. But as the research for gender-especially the family history-gets active, various aspects showing that 'Ie' is the modern product developed through thoroughly intended plans of Meiji government after latter-day. According to Ueno Chizuko, 'Ie' system is not at all a traditional feudal system, but it rather is the family revised by modernization, in other word, it is the Japanese version of modern family. This words began with it being the study of goodwill, and recognizing that 'Ie' is the creation of modernization, and as well as the need to listen to the new woman's inner voice under the Japanese patriarchal system. The most appealing characteristic of modern Japanese patriarchal system is that the it needs only the family members who are dedicated to the 'Nation'. With this, women were expected to submit to the authority and their roles, which are, as a wife and mother who obeys by supporting, preserving, and maintaining the patriarchal system. But as the new women themselves expressed their independence, these roles are hard to be expected. It was no other than new women's magazine Seito which arose against the Japanese patriarchal system. In this statement, careful observation was done on the novel based on tiny internal conflicts or the aspects of anguish, that could not have been illustrated enough after judging the significant issues of early modern liberalism of women based on new women's editorials, discussions, that were illustrated most directly and compressively. Through this, it was pointed out that Seito magazine is not consisted logically, and that reason for that is the female authors' different desires were tangled and it reflects the complicated situation of that period whether they were intended or not. Overall, unlike the literatures (men-centered) of same era, the genre of literature or the novel did not put them on prerogative place, and confirmation could be made once again that the women's writing aspects are related closely with gender recognition more than anything.

• 노동경제논집
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• 제27권1호
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• pp.77-105
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• 2004

본고는 저축을 통한 자가보험이나 실업급여가 현실적으로 제한되어 있는 상황에서 실직자에게 실업급여뿐 아니라 미래 연금을 담보로 한 대출을 허용하는 새로운 실업자 보호 제도를 제시하고 그 실증적 효과성을 패널자료에 의해 분석하고 있다. 이 제도는 실직자들이 미래 소득을 담보로 대출을 받아 효과적 자가보험을 갖도록 함으로써 실업급여에 비해 구직유인을 유지하게 할 뿐 아니라 소비 균등화 및 실직위험 부담 완화를 꾀할 수 있도록 한다. 본고는 경제활동인구조사에 근거한 1998~2002년 패널자료를 이용하여 시뮬레이션하였고 그 결과 기존 실업급여제도 하에서 보조를 받고 있는 저학력 계층도 실업급여보다는 연금담보 대출을 더 선호한다는 사실을 보고하고 있다. 이 결과는 연금담보 대출의 소비 균등화 및 구직유인 강화에 의한 후생증대 효과가 매우 강력함을 시사하고 있으며, 제한적인 효과밖에 갖지 못하는 기존 실업급여제도를 대체할 수 있는 새로운 실직자 보호정책 대안이 될 수 있음을 보여주고 있다.

• 신재생에너지
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• 제3권4호
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• pp.31-37
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• 2007

Because of their low operating and maintaining costs, ground-source heat pump(GSHP) systems are an increasingly popular choice for providing heating, cooling and water heating to public and commercial buildings. Despite these advantages and the growing awareness, GSHP systems to residential sectors have not been adopted in Korea until recently. A feasibility study of a residential GSHP system was therefore conducted using the traditional life cycle cost(LCC) analysis within the current electricity price framework and potential scenarios of that framework. As a result, when the current residential electricity costs for running the GSHP system are applied, the GSHP system has weak competitiveness to conventional HV AC systems considered. However, when the operating costs are calculated in the modified price frameworks of electricity, the residential GSHP system has the lower LCC than the existing cooling and heating equipments. The calculation results also show that the residential GSHP system has lower annual prime energy consumption and total pollutant emissions than the alternative HVAC systems considered in this work.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 추계학술대회 논문집
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• pp.515-518
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• 2007

Because of their low operating and maintaining costs, ground-source heat pump(GSHP) systems are an increasingly popular choice for providing heating, cooling and water heating to public and commercial buildings. Despite these ad- vantages and the growing awareness, GSHP systems to residential sectors have not been adopted in Korea until recently. A feasibility study of a residential GSHP system was therefore conducted using the traditional life cycle cost(LCC) analysis within the current electricity price framework and potential scenarios of that framework. As a result, when the current residential electricity costs for running the GSHP system are applied, the GSHP system has weak competitiveness to conven- tional HVAC systems considered. However, when the operating costs are calculated in the modified price frameworks of electricity, the residential GSHP system has the lower LCC than the existing cooling and heating equipments. The calculation results also show that the residential GSHP system has lower annual prime energy consumption and total pollutant emissions than the alternative HVAC systems considered in this work.

• 정보교육학회논문지
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• 제7권1호
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• pp.1-10
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• 2003

웹 기반 교육은 하이퍼텍스트의 기술과 인터넷의 전송속도 증가에 따른 다양한 상호작용을 기반으로 원격교육을 가능하게 하는 새로운 학습 환경이다. 즉, 이것은 학습자가 자신의 필요와 요구에 따라 비순차적으로 융통성 있게 정보에 접근하고 자신의 경로를 개발할 수 있는 학습자 중심의 환경을 제공한다. 하지만 이러한 학습 환경은 학습자의 학습경로 선택의 어려움, 방향상실의 위험성, 인지과부하의 문제 등 이전에는 없었던 새로운 문제들을 야기하고 있다. 이러한 문제들은 학습동기와 흥미유지에 방해가 되어 결국 학습효과를 떨어뜨리게 된다. 이 연구는 초등학교 학생들의 학습에 대한 흥미를 지속시키기 위한 방안으로 3D 기반 공간 항해 시스템을 제안하고, 이를 구현 한 다음 그 효과를 검증한다.

• Journal of Power Electronics
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• 제12권1호
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• pp.145-156
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• 2012

These days, the application of electronic power transformers (EPTs) is expanding in place of ordinary power transformers. These transformers can transmit power via three or four wire converters. Their dynamic performance is extremely important, due to their complex structure. In this paper, a new method is proposed for improving the dynamic performance of distribution electronic power transformers (DEPT) by using sliding mode control (SMC). Hence, to express the dynamic characteristics of a system, different factors such as the voltage unbalance, voltage sag, voltage harmonics and voltage flicker in the system primary side are considered. The four controlling aims of the improvement in dynamic performance include: 1) maintaining the input currents so that they are in sinusoidal form and in phase with the input voltages so they have a unity power factor, 2) keeping the dc-link voltage within the reference amount, 3) keeping the output voltages at a fixed amount and 4) keeping the output voltages in sinusoidal and symmetrical forms. Simulation results indicate the potential and capability of the proposed method in improving DEPT behavior.

• 정보교육학회논문지
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• 제9권2호
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• pp.177-185
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• 2005

블로그는 트랙백이라는 기술을 이용하여 개인이 생산한 정보나 일상의 기록을 웹상에서 다수의 사람들과 공유할 수 있게 하는 미디어 체계이다. 즉 기존까지 행하여진 웹활동이 수동적이었고 일방적이었던 반면 블로그는 개인이 주체적이고 사회의 일원으로써 관심을 받을 수 있게되는 계기가 되었다. 이에 본 연구에서는 블로그 활동이 학생들의 일반적, 사회적 자아 존중감에 어떠한 영향을 주는 가를 알아보기위해 학급 블로그 시스템을 설계하여 실제 운영해 보았다. 그 결과 6개월간 블로그를 활용한 집단이 그렇지 않은 집단에 비해 일반적 자아 존중감, 사회적 자아존중감 등 대부분의 자아 존중감 수치가 유의미하게 높게 나타났다.