• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.456-458
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• 2005

As a viable alternative to magnetic transformers in the power supply for portable electronics, this paper presents a miniaturized off-line travel adapter or charger for cellular phones using the piezoelectric transformer. Various design considerations in the design of ac PT adapters are investigated before coming up with the proposed pseudo-resonant topology. A prototype hardware design is also presented and verified by simulations and experiments

• 한국심리학회지 : 문화 및 사회문제
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• 제24권2호
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• pp.273-300
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• 2018

본 연구는 서울로 상경한 지방출신 여성들의 서울정착 과정에서의 경험을 분석하기 위해 서울로 대학을 진학하고 졸업 후 남아 직장생활을 지속하고 있는 7명의 여성들을 대상으로 심층면담을 통해 근거이론을 활용하여 분석하였다. 개방코딩에서는 110개의 개념, 21개의 하위범주와 이들을 포함하는 11개의 범주가 도출되었다. 인과적 조건은 '서울정착의 힘겨움'이며 맥락적 조건으로는 '심리적 불안 심화', '생활의 질 하락', '경제적 불안의 지속'으로 나타났다. 중심현상으로는 '서울정착의 지속여부에 대한 딜레마'로, 중재조건은 '서울상경이후 10년의 경험진단'으로 드러났다. 작용/상호작용 전략은 '개인생활의 변화', '안정된 직장을 통한 경제력 확보', '사회참여의 모색'으로, 결과는 '서울 정착의 지속성 여부 선택'으로 나타났다. 지방출신 여성들의 서울 정착과정에서의 경험에 대한 패러다임은 대학진학을 위해 서울로의 상경과 독립, 순응과 적응, 성장과 실패, 도전과 모색, 성찰과 새로운 선택 등의 정착과정을 거쳤다. 참여자들의 경험을 종합해 보면 이들은 30대가 되었어도 이방인과 같은 이질감과 불안을 인식하고 있었다. 당면한 문제들은 대학시절 보다 훨씬 복합적이고 다양해졌다. 직장인으로서 경제활동을 본격화하였지만, 서울 출신들과의 격차는 좁혀지지 않았다. 이제 이들은 누적된 피로감과 개인이 해결할 수 없는 사회적 문제로 인해 서울을 떠나 새로운 대안을 찾아야 한다는 절박감마저 엿보였다. 결론적으로 서울 상경 여성들의 안정된 정착은 개인의 노력만으로 한계가 있으며, 한국 사회 전반의 사회적 문제해결과 더불어 구체적 정책 대안들의 개입이 필요하다는 것을 확인하였다.

• 패션비즈니스
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• 제5권1호
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• pp.97-116
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• 2001

Character fashion was already turned up in Egyptian age and nowadays was worn to everybody as regardless of ages, level and sex of people. This paper reviewed character fashion and animation character based on USA and Japan that is outstanding more coming up today and compared and analyzed with our country's situation. Usually, character fashion would give imagnation of products and companies themselves for aesthetic sense and can show possessive feeling and personality. And that mean fashion used by character like pictures and signals(that include words figures and special signals) and these fashion using by animation character was come out in 1929. In spite of third producer, Korea, back from USA and Japan about character fashion, we faced many problems. In order to solve these problems, we must make our own pure character that do not need to pay royalty and must spread marketing strategy with character fashion of more various designs. Therefore we should concentrate for raising high quality works and avoid uneconomic investment and plagiarism and finally we must expand recognition concerning character fashion.

• 자연과학논문집
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• 제9권1호
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• pp.153-168
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• 1997

본 연구는 우리 나라 여성 머리 장신구의 시대적 흐름에 따른 그 변천 과정을 고찰하고 머리 장신구가 각 개인의 외모에 뚜렷한 분위기를 갖게 하고 개성을 표현케 하는 이상적 매체, 즉 조형예술의 한 형태로 인식하여 머리 장신구의 조형미를 탐구하는데 그 목적을 두고자 한다. 연구 방법으로는 문헌 자료를 통하여 고찰하였고, 고분 벽화, 정기 간행물, 그리고 학위논문 등을 참조하였다. 연구 내용으로는 우리 나라 고대 여성의 머리 장신구의 기원 및 변천 과정을 살펴보았고, 근대 여성의 머리 형태에 따른 머리 장신구의 조형미를 종류와 형태, 재료, 문양으로 분류하여 각기 그 특성을 파악하였다. 여성의 머리 장신구에 대한 관심은 현대에 와서도 여전하며, 고대에서 근대에 이르기까지의 머리 장신구 디자인의 조형미를 살펴봄으로써 우리 나라의 전통적인 형태와 문양을 반영할 수 있는 머리 장신구 디자인의 개발과 우리 나라의 독특한 재료를 사용하여 기능성과 미적인 측면을 공유한 현대적인 디자인을 고안하는데 기여하고자 한다.

• 한국응용과학기술학회지
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• 제30권3호
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• pp.528-539
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• 2013

Biodiesel is one of the most important renewable energy, since it is one of the most important alternative and eco-friendly energy source compared to fossil energy, especially for diesel engineequipped vehicles. It is now coming up for preparation of biodiesel as the alternative that applies the hetrogeneous catalyst, super critical state and various methods used in order to reduce the stages of the processes be converted and separation stages started from oil and fat which are originated from animals and wastes, and those new methods bring eco-friendly as well, though some of those are stand on research step so far. It is necessary that nation provides the tax exemption program for the supplier and strengthen the research system for the farming crops relate to fat and oil. It can improve the development of biodiesel which sustains stability against oxidation and keeps good mobility over the low temperatures in the winter season by new additives and develops new processes to show good harmony with diesel engine.

• 기술사
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• 제36권6호
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• pp.28-35
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• 2003

The present world economic powers are divided into three major economic blocks such as EU, NAFTA and North - east Asian Region. In N-E Asian Region, Beijing. Seoul, Tokyo and Shanghai are already bridged economically forming transaction belt with the population of seven hundred million people around the belt. The countries as China, Mongol far - east Russia are rich in natural resources. on the other hand Korea and Japan are superior in technological know-how than that of communist and socialist countries. If we try to be eager to join together with the resource rich countries to the countries of technological know - how as Korea and Japan. The North - east Asian region will be jumping up to the most prosperous and super economic power in the coming years in 2040-2050.

• 방송과미디어
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• 제19권2호
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• pp.36-45
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• 2014

With major sports events such as FIFA World Cup and The Olympic Games coming up, UHDTV technology has been given a major push by broadcasters, test and measurement (T&M), and consumer electronics (TV and set-top box) manufacturers. The increase in picture resolution ($3840{\times}2160$) for 4K and ($7680{\times}4320$) for 8K compared to current HDTV ($1920{\times}1080$), as well as the need to deliver these services in higher frame rates (50/60 up to 100/120fps) translate to a big challenge in UHDTV content delivery to households over terrestrial transmission due to higher data rates. DVB-T2 has been favored by many countries across the world as it is proven to give the best spectral efficiency for terrestrial broadcasting. On the other hand MPEG-4 appears to be the bottleneck for UHDTV since a much higher data rate is needed to deliver such services. Therefore HEVC becomes mandatory for UHDTV delivery over DVB-T2. In this paper, we will give an overview about a complete end-to-end solution for UHDTV delivery over DVB-T2 based on a realistic SFN scenario in Seoul metropolitan area.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.974-979
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• 2007

From '1994 Gwacheon accident of the Electric Multiple Unit(EMU)' till '2004 Seoul subway 2 lines Guui station accident', the accident is increasing at day and the service demand of the citizen is coming to be various. But it does not deal with technical or operation side demands. There is a possibility of saying that the accident of the EMU or deficit operation is caused by the RCM. The EMU where the efficiency is good though does the time passes and it becomes old anger and does not display that efficiency not only the cause of formation accident does becomes. The breakdown about under occurring before getting up an accident, appropriately shifting the parts is to a maintenance very the pending question fact which is important is a possibility of doing. From there is by an EMU, RCM in reliability base grudge is a tool of confirms an improvement point and the place where it judges. From the research which it sees will present about technical development plan of RCM.

• 한국실내디자인학회논문집
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• 제22권4호
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• pp.141-148
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• 2013

This study aims to investigate the eco-friendly planning methods for a sustainable apartment houses in the Metropolitan area of Seoul. Eco-friendly plans that considers the environmental issues were attempted from the beginning of 2000s, and since then, many apartment houses in Korea were built using this concept. They were, however, generally focusing on the physical and spatial aspects of the site plan. After the Seoul C40 weather summit conference in 2009, the low carbon green housing standard has been emphasized and thus the chemical concept was added to the existing physical planning methods. Under such a background, this study intends to investigate the eco-friendly plans for the apartment houses in the 2000s. This includes an ecological network plan, an ecological base plan, a building greening plan, a water treatment plan, and an energy saving plan. Based on the analysis and synthesis of these planning methods in the early 21st century, it would be possible to set up a proper future plan to enhance the sustainable built environment in the housing industry in the coming years.

• 천문학회보
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• 제46권1호
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• pp.27.4-28
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• 2021

Since the first direct detection of the gravitational waves in 2015, more than 50 events coming from the merging of compact binaries composed of black holes and neutron stars have been observed. The simultaneous detection of gravitational waves and electromagnetics waves from the merging of neutron stars opened up multi-messenger astronomy. The forthcoming observations with better sensitivity by the network of ground based detectors will enrich the gravitational wave source populations and provide valuable information regarding stellar evolution, dynamics of dense stellar systems, and star formation history across the cosmic time. The precision of the Hubble constant from the distance measurement of gravitational sources will improve with more binary neutron star events are observed together with the aftweglows. I will also briefly cover the expected scientiic outcomes from the future detectors that are sensitive to much lower frequenies than current detectors.