• 한국콘텐츠학회논문지
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• 제13권7호
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• pp.38-50
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• 2013

영화감독 양영희의 두 편의 다큐멘터리 <디어 평양>(2005), <굿바이, 평양>(2009)과 극영화 <가족의 나라>(2013)는 재일코리안 디아스포라로서 감독의 자전적 경험을 바탕으로 제작된 영화로 남북한과 일본이라는 국민국가의 틈바구니에 선 재일코리안 디아스포라 문제를 제기하고 있다. 세 편의 영화는 제주, 오사카, 평양을 횡단하며 구축된 가족의 서사를 질문하는 것을 통해 국민국가가 부과한 경계를 의심하고 '가족의 나라'라는 새로운 탈주의 공간을 모색한다. 이 글은 양영희의 영화가 분단으로 한반도에 발생한 두 개의 국민국가가 강력하게 추구하는 통합과 일체감, 조국에 대한 획일적인 교육에 긴장을 일으키고 그것을 이질화시키면서 자신의 정체성을 재조정해가는 과정을 추적하였다. 결국 이들 영화는 국민국가의 경계를 넘나드는 혼종적 정체성에서 재일코리안 디아스포라의 미래 정체성을 예견하고 있는데 이는 동북아의 평화와 공존, 남북한의 적대성을 해체하는 작업에서 요구되는 타자 수용성, 개방성, 연대성의 가능성이 재일 코리안 디아스포라에게 있음을 보여주는 것이라 할 수 있다.

• 한국수소및신에너지학회논문집
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• 제23권3호
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• pp.250-255
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• 2012

In this paper, the development and performance analysis of a fuel cell-powered unmanned aerial vehicle is described. A fuel cell system featuring 1 kW proton exchange membrane fuel cell combined with a highly pressurized fuel supply system is proposed. For the higher fuel consumption efficiency and simplification of overall system, dead-end type operation is chosen and each individual system such as purge system, fuel supply system, cooling system is developed. Considering that fluctuation of exterior load makes it hard to stabilize fuel cell performance, the power management system is designed using a fuel cell and lithium-ion battery hybrid system. After integration of individual system, the performance of unmanned aerial vehicle is analyzed using data from flight and laboratory test. In the result, overall system was properly operated but for more duration of flight, research on weight lighting and improvement of fuel efficiency is needed to be progressed.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.1041-1043
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• 2013

현재 모바일 디바이스 보급이 증가하면서 1인 N 모바일 디바이스의 시대가 열리고 있다. 모바일 디바이스와 OS의 종류도 지속적으로 늘어나고 있으며, 시장점유율이 90%이상이 되는 Google의 Android나 Apple의 iOS뿐만 아니라 삼성과 인텔이 개발하고 있는 TIZEN, Linux의 UBUNTU를 모바일화 시킨 OS들이 출시를 앞두고 있다. 하지만 서로 다른 OS간의 파일을 공유 할 수 있는 시스템이나 기술은 없는 실정이다. Bluetooth나 WiFi Direct와 같은 기술들은 존재하지만 기기간의 호환성이 낮고, 전송 가능한 파일형식에 따른 제약이 존재한다. 이에 본 논문에서는 OS간의 파일공유 방법에 대해 연구하고, 모바일 디바이스뿐만 아니라 서로 다른 이기종간의 무선랜 환경에서 파일의 공유방법에 대해 연구한다. 향후 연구 과제로는 모바일 서버의 보급과 구축이 용이한 원터치 모바일 서버에서 구축, 관리, 유지, 보수 등의 서비스를 제공하는 모바일 통합 서버 시스템에 대해 연구한다.

• Structural Engineering and Mechanics
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• 제15권1호
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• pp.83-114
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• 2003

A new simple 3-node triangular flat-shell element with standard nodal DOF (6 DOF per node) is proposed for the linear and geometrically nonlinear analysis of very thin to thick plate and shell structures. The formulation of element GT9 (Long and Xu 1994), a generalized conforming membrane element with rigid rotational freedoms, is employed as the membrane component of the new shell element. Both one-point reduced integration scheme and a corresponding stabilization matrix are adopted for avoiding membrane locking and hourglass phenomenon. The bending component of the new element comes from a new generalized conforming Kirchhoff-Mindlin plate element TSL-T9, which is derived in this paper based on semiLoof constrains and rational shear interpolation. Thus the convergence can be guaranteed and no shear locking will happen. Furthermore, a simple hybrid procedure is suggested to improve the stress solutions, and the Updated Lagrangian formulae are also established for the geometrically nonlinear problems. Numerical results with solutions, which are solved by some other recent element models and the models in the commercial finite element software ABAQUS, are presented. They show that the proposed element, denoted as GMST18, exhibits excellent and better performance for the analysis of thin-think plates and shells in both linear and geometrically nonlinear problems.

• 한국태양에너지학회 논문집
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• 제38권2호
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• pp.55-66
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• 2018

South Korea aims to shift the 20 percent of electricity supplement from the fossil fuel including the nuclear to renewable energy systems by 2030. In order to realize this agenda in the buildings, the plus energy house is necessary to increase the renewable energy supplement beyond the zero energy house. This paper suggested KePSH (KIER Energy-Plus Solar House) and energy performance of house and renewable energy systems was investigated. The KePSH has the target of generating 40% surplus energy than the conventional house energy consumption. The plus energy house is the house that generates surplus energy from the renewable energy sources than that consumes. In order to minimize the cooling and heating load of the house, the shape design and passive parameters design were conducted. Based on the experimental data of the plug load in the typical house, the total energy consumption of the house was estimated. This paper also suggested renewable energy sources integrated HVAC system using air-source heat pump system. Two cases of renewable energy system integration methods were suggested, and energy performance of the cases was investigated using TRNSYS 17 program. The results showed that the BIPV (building integrated photovoltaic) system (i.e., CASE 1) and BIPV and BIST system (i.e., CASE 2) shows 42% and 29% of plus energy rate, respectivey. Also, CASE 1 can generate 59% more surplus energy compared with the CASE 2 under the same installation area.

• 한국광학회지
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• 제18권3호
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• pp.216-220
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• 2007

본 논문에서는 굴절률 차이가 큰 폴리머 광 도파로를 이용하여 광대역 파장가변이 가능한 이중 링 공진기 Add/Drop 필터를 제작하였다. Add/Drop 필터의 제작시 공정 오차에 둔감한 특성을 갖도록 광 결합기를 설계하였다. 코어와 클래딩의 굴절률은 1550 nm 파장 대역에서 각각 1.51, 1.378로 약 $100{\mu}m$ 정도의 곡률 반경을 가지는 곡선 도파로를 수용할 수 있다. 두 개의 링이 동시에 공진하는 파장 대역에서 Drop 특성은 이웃하는 피크 좌다 약 2.9 dB 이상 높은 특성을 보였다. 이 필터는 반사형 반도체 광증폭기 등과의 하이브리드 집적을 통하여 광대역 파장 가변 레이저 다이오드를 구현하는데 활용할 수 있을 것으로 기대된다.

• 노인간호학회지
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• 제20권sup1호
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• pp.119-126
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• 2018

Purpose: The aim of this study was to describe problems and solutions for older adults living alone and using wearable devices to report depressive moods in daily life. In addition, gerontology nurses' competencies and strategies were discussed based on lessons learned from the observational study. Methods: A hybrid method was used, combining literature review and content analyses based on interviews with 53 participants and observations done by the research team. Results: Main issues and relevant strategies were identified in terms of (1) applicability of information and communications technology (ICT) devices for older adults, (2) feasibility of older adults' use of ICT devices, (3) integration of ICT devices into daily life, and (4) relevant issues when older adults use ICT. Important roles and competencies were discussed regarding general and gerontology aspects of ICT. Conclusion: Findings indicate that a wearable device is feasible to measure daily depressive moods in older adults living alone in community settings. To extend our research protocol to practice, gerontology nurses must adequately prepare to meet emerging health care trends and end users' needs for ICT-based nursing. It is necessary to develop diverse educational programs and active involvement in research and design of relevant devices and programs.

• 대한금속재료학회지
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• 제56권12호
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• pp.915-920
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• 2018

With the development of modern microelectronics technologies, the power density of electronic devices is rapidly increasing, due to the miniaturization or integration of device elements which operate at high frequency, high power conditions. Resulting thermal problems are known to cause power leakage, device failure and deteriorated performance. To relieve heat accumulation at the interface between chips and heat sinks, thermal interface materials (TIMs) must provide efficient heat transport in the through-plane direction. We report on the enhanced thermal conduction of $Al_2O_3-based$ polymer composites, fabricated by the surface wetting and texturing of thermally conductive hexagonal boron nitride(h-BN) nanoplatelets with large anisotropy in morphology and physical properties. The thermally conductive polymer composites were prepared with hybrid fillers of $Al_2O_3$ macro beads and surface modified h-BN nanoplatelets. Hexagonal boron nitride (h-BN) has high thermal conductivity and is one of the most suitable materials for thermally conductive polymer composites, which protect electronic devices by efficient heat dissipation. In this study, we synthesized hexagonal boron nitride nanoparticles by the pyrolysis of cost effective precursors, boric acid and melamine. Through pyrolysis at $900^{\circ}C$ and subsequent annealing at $1500^{\circ}C$, hexagonal boron nitride nanoparticles with diameters of ca. 50nm were synthesized. We demonstrate that the addition of a small amount of calcium fluoride ($CaF_2$) during the preparation of the melamine borate adduct significantly enhanced the crystallinity of the h-BN and assisted the growth of nanoplatelets up to 100nm in diameters. The addition of a small amount of h-BN enhanced the thermal conductivity of the $Al_2O_3-based$ polymer composites, from 1.45W/mK to 2.33 W/mK.

• 동남아시아연구
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• 제28권1호
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• pp.1-20
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• 2018

2017년 동남아의 정치경제는 대미의존적 안보질서와 대중의존적 경제질서가 중첩하는 역설적 '이중질서'로 요약되는 동아시아의 지정학적 지경학적 조건에서 전개된다. 경제발전의 지속적 진전과 정치발전의 만성적 부진이 날카롭게 엇갈리는 동남아의 두 얼굴은 동남아와 동북아를 포괄하는 동아시아의 두 얼굴을 충실하게 반영한다. 정치적 차원에서, 전체주의의 향수를 떨쳐내기 어려운 베트남, 라오스, 캄보디아, 미얀마 등 구사회주의권은 전체주의와 권위주의 사이의 완충지대에 서식하고, 민주주의의 명분을 저버리기 어려운 필리핀, 태국, 인도네시아, 말레이시아, 싱가포르 등 원자본주의권은 권위주의와 민주주의 사이의 회색지대를 전전한다. 경제적 차원에서, 계획경제의 거대한 유산을 포기하기 어려운 구사회주의권은 신국가주의적 '베이징 콘센서스'로 분장되는 중국형 국가자본주의의 은밀한 유혹과 타협하고, 시장경제의 화려한 신화를 외면하기 어려운 원자본주의권은 신자유주의적 '워싱턴 콘센서스'로 포장되는 미국형 자유자본주의의 오만한 압력에 노출된다. 그에 따라 동남아의 지역통합을 대변하는 아세안 공동체는 대륙세력과 해양세력의 경쟁적 협공에 따라 '신냉전'의 부상이 예감되는 전략적 곤경에서 끊임없이 부침한다.

• Advances in nano research
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• 제13권2호
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• pp.187-197
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• 2022

The synthesis of organic and hybrid organic-inorganic perovskites directly from solution improves the cost- and energy-efficiency of processing. To date, numerous research efforts have been devoted to investigating the influence of the various solvent parameters for the synthesis of lead halide perovskites, focused on the effects of different single solvents on the efficiency of the resulting perovskites. In this work, we investigated the effect of solvent blends for the first time on the structure and phase of perovskites produced via the Lewis base vapor diffusion method to develop a new synthetic approach for water-stable CsPbBr₃ particles with nanometer-sized dimensions. Solvent blends prepared with DMF and water-miscible solvents with different Gutmann's donor numbers (D_N) affect the Pb ions differently, resulting in a variety of lead bromide species with various colors. The use of a DMF/isopropanol solvent mixture was found to induce the formation of the Ruddlesden-Popper perovskite based on lead bromide. This perovskite undergoes a blue color shift in the solvated state owing to the separation of nanoplatelets. In contrast, the replacement of isopropanol with DMSO, which has a high DN, induces the formation of spherical CsPbBr₃ perovskite nanoparticles that exhibit green emission. Finally, the integration of acetone in the solvent system leads to the formation of lead bromide complexes with a yellow-orange color and the perovskite CsPbBr₃.