Nanogenerators: Fully Rollable Transparent Nanogenerators Based on Graphene Electrodes (Adv. Mater. 19/2010)

Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19

<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>

압축성 코드에서 예조건화 코드로의 이진

한상훈(Sang-Hoon Han),김명호(Myeong-Ho Kim),최정열(Jeong-Yeol Choi) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.3

이차원 범프 유동에 대한 다양한 예조건화 행렬의 수렴 특성을 살펴 Choi와 Merkle의 예조건화 행렬을 선택하여, 압축성 및 예조건화 Roe의 Riemann 해법의 수치 소산항을 수학적으로 비교하였다. 이 결과 코드의 구조는 동일하게 유지한 채, 고유치의 작은 수정만으로 압축성 해법을 예조건화 해법으로 이전할 수 있는 방법을 알 수 있었다. 아울러 점성 유동 영역에서의 안정성 및 정확성을 향상시키기 위하여 von Neumann 안정 조건 및 점성 자코비안을 고려하였으며, 개발된 코드는 표준 검증 문제에 적용하여 검증을 수행하였다. Comprehensive mathematical comparison of numerical dissipation vector was made for a compressible and the preconditioned version Roe's Riemann solvers. Choi and Merkle type preconditioning method was selected from the investigation of the convergence characteristics of the various preconditioning methods for the flows over a two-dimensional bump. The investigation suggests a way of migration from a compressible code to a preconditioning code with a minor changes in Eigenvalues while maintaining the same code structure. Von Neumann stability condition and viscous Jacobian were considered additionally to improve the stability and accuracy for the viscous flow analysis. The developed code was validated through the applications to the standard validation problems.

ADSL을 위한 전화선로의 특성분석 및 등화기 설계

최성환,전진화,권호열 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-

In this paper, we evaluate transmission channel characteristics of telephone cable to be used in general. First, we measured the impedances of open and short circuits in order to obtain the RLCG parameters per unit length of transmission line. And we obtained the frequency-dependent transfer function and propagation constant for transmission line using these values. The channel impulse response is derived from the inverse Fourier of transfer function. We design channel equalizer for ADSL(Asymmetrical Digital Subscriber Line) using the measured impulse response of channel. The results shows that the transfer characteristics decrease sharply according to the length of transmission line. Finally, we verify efficacy of the proposed method by means of simulation.

대형 건물에서의 화재시 연기 거동 및 거주자 피난에 관한 수치해석 연구

최상열,유홍선 중앙대학교 미래신기술연구소 2003 미래신기술연구소 논문집 Vol.12 No.1

본 수치해석 연구는 대형 건물에서의 화재 발생시 화재공간 내부의 온도장 및 연기거동을 해석하고, 거주자들의 피난을 모사하기 위해 FDS 코드와 SIMULEX 프로그램을 각각 사용하여 수행하였다. 서울의 대형 OO 빌딩의 지상 19 층과 지하 2 층을 해석 대상으로 하였으며, 초기 화재의 발생은 Fast 화재 성장모드로 가정하였고, 거주자의 다양성을 적용하여 피난을 해석하였다. 화재 발생 후, 지상 19 층의 경우 4 분여가 경과하면 국부적으로 천장 온도가 300 도 이상으로 상승하는 부분이 발생하게 되고, 사람의 키 높이 정도에서 가시거리가 5m 이하로 나타나게 되어 피난에 장애를 초래하는 것으로 나타났다. 지하 2 층의 경우는 아트리움의 영향에 의해 연기가 전체 공간으로 퍼져나가지 않았으며, 1.8m 정도의 높이까지 연층이 하강하는데 걸리는 시간은 약 5분 정도가 소요되었다. Smoke movement, temperature field, and evacuation of occupants in the nineteenth floor and the second floor underground of a large building on fire are studied. FDS code and SIMULEX program are used for the analysis of smoke movement, temperature field and evacuation of occupants, respectively. Fire growth mode is assumed as 'Fast' in the initial fires, and people characteristics are considered to account for the various evacuation feature. In case of fire on the nineteenth floor, after 4 minutes have passed, the region where the ceiling temperature is above 300℃ locally appears and visibility distance at the height of an adult becomes below 5m. This visibility distance causes the difficulty in people's evacuation. In case of a fire on the second floor underground, smoke did not spread over the whole area due to the geometry of atrium and it takes 5 minutes for the smoke layer move down to 1.8m vertical distance.

작약의 RAPD 분석을 위한 PCR 최적조건 구명

최인수,김성만,김용철,이충렬,박현철 밀양대학교 농업기술개발연구소 2000 農業技術開發硏究所報 Vol.4 No.1

To optimize the PCR condition is one of the most important steps for RAPD analysis. The purpose of this study was to optimize PCR condition in Paeonia. 3×3×3 factorial experiment for template DNA concentration, MgCl2 concentration, and amount of taq polymerase was conducted. Another factorial experiment for reaction temperature(denature, annealing, and extension) was also conducted. The most appropriate template DNA concentration was 60ng. Clear bands were observed from 2.5mM and 4.5mM of MgCl2 if template DNA concentration and amount of taq polymerase were proper. Amount of taq polymerase for the optimal PCR condition was 0.5unit and 1unit. In the consideration of results from template DNA concentration, MgCl2 concentration, and amount of taq polymerase, 4 conditions (60ng of template DNA, 2.5mM MgCl2 and 0.5unit taq polymerase; 60ng of template DNA, 4.5mM MgCl2 and 0.5unit taq polymerase; 60ng of template DNA, 4.5mM MgCl2 and lunit taq polymerase; and 40ng of template DNA, 4.5mM MgCl2 and 1unit taq polymerase) were best combinations for the optimal PCR condition. Reaction temperature for the optimal PCR condition was 92℃, 36℃, 72℃.

신발産業의 實態分析 및 競爭力 提高方案

崔相文,徐炳寅,方鎬烈,崔鍾烈 釜山 大學校 經營 經濟 硏究所 1988 經營 經濟 硏究 Vol.7 No.1

中國 WTO加入이 中國會計環境에 미치는 影響

최상문,김확열,최수현 국제무역학회 2002 국제무역연구 Vol.8 No.1

본 논문의 목적은 WTO 가입이 중국회계환경에 미치는 영향을 통하여 회계시장과 회계제도가 WTO 가입 이후에 받게 될 충격과 이를 극복하기 위한 방안을 제시함으로써 중국회계제도 개혁의 발전방향을 연구하고 이로써 한국기업의 중국진출에 도움을 주려는 데 있다. 따라서 본 논문은 중국 WTO 가입이 회계환경에 미치는 영향과 대책을 분석하고 국제회계기준과의 비교를 통하여 중국회계제도의 발전방향을 체계적이고 이론적으로 제시한 연구이다. This paper's purpose is to analyze the impact and to get corresponding ways for Chinese accounting system after China will join WTO. In addition, this paper foresee the development direction of Chinese accounting system, and this is a theoretical research paper. Accounting system reform has significant meaning for socialist market economy. If we don't actively carry out this research, we can't effectively forecast Chinese economic development and get correct means. The meaning of this paper lies in : 1. In theoretical aspect: This paper forecast the development direction and course of Chinese accounting system And observe economic development and prospect. 2. In practical aspect : Between China and South Korea, if we ignore or misunderstand accounting system of both side, we will get great loss. Even thought Chinese corporations limited is using this system, we believe all of Chinese companies put into effect. On the foundation of this research, I want to study on Chinese enterprise accounting principals and audit system, and research Chinese economic development and influence in the future, especially after joining WTO.

특정적 광과민성 피부증상 없이 우울증으로 입원한 전신성 홍반성 낭창 1례

최석채,이상열,박민철,나용호 圓光大學校 醫科學硏究所 1998 圓光醫科學 Vol.14 No.2

We experienced a 22-years-old female patient with systemic lupus erythematosus (SLE) who was admitted with major depressive disorder symptoms such as a depressive mood, loss of appetite, weight loss, insomnia, and fatigue. She did not show any characteristic photosensitive cutaneous symptoms of SLE when she came to the hospital. Antidepressants and psychotherapy under hospitalization did not show any improvements in her depressive symptoms. Her past history revealed Raynaud's phenomenon and arthralgia, leukopenia, normochronic normocytic anemia and elevated erythrocyte sedimentation rate were detected on her routine laboratory examinations. We considered an autoimmune connective tissue disease and performed specific hematologic and immunologic tests. We confirmed that her systemic symptoms and results of specific tests were fitted to a case of SLE, so we started prednisolone medication. After treating the patient with prednisolone for 2 weeks, her psychiatric and systemic symptoms of SLE were improved. We concluded that psychiatrists have to pay attention to SLE that can manifest depressive symptoms without characteristic photosensitive cutaneous symptoms of SLE.

팥의 RAPD 분석 조건 최적화 연구

이충열,박현철,박진철,김성만,김용철,최재희,최인수 밀양대학교 농업기술개발연구소 2000 農業技術開發硏究所報 Vol.4 No.1

The object of this study was to optimize PCR condition for RAPD analysis in adzuki bean. The best template DNA concentration was 20ng(0.25unit taq polymerase and 2.5mM MgCl2), 40ng(1unit taq polymerase and 2.5mM MgCl2, 1unit taq polymerase and 4.5mM MgCl2 and lunit taq polymerase and 7.0mM MgCl2), and 60ng(0.5unit taq polymerase and 2.5mM MgCl2, 0.5unit taq polymerase and 4.5mM MgCl2, 1unit taq polymerase and 2.5mM MgCl2, and 1unit taq polymerase and 4.5mM MgCl2) The best MgCl2 concentration was 2.5mM(40ng template DNA and 1unit taq polymerase, 60ng template DNA and 0.5unit taq polymerase, and 60ng template DNA and 1unit taq polymerase), 4.5mM(20ng template DNA and 0.25unit taq polymerase, 60ng template DNA and 0.5unit taq polymerase, and 60ng template DNA and 1unit taq polymerase), and 7.0mM(40ng template DNA and 1unit taq polymerase). Amount of taq polymerase was 0.25unit(20ng template DNA and 2.5mM MgCl2), 0.5unit(60ng template DNA and 2.5mM MgCl2, 60ng template DNA and 4.5mM MgCl2) and 1unit(40ng template DNA and 2.5mM MgCl2, 40ng template DNA and 4.5mM MgCl2, 40ng template DNA and 7.0mM MgCl2, 60ng template DNA and 2.5mM MgCl2, 60ng template DNA and 4.5mM MgCl2, and 60ng template DNA and 7.0mM MgCl2). When we consider results from template DNA concentration, MgCl2 concentration, and amount of taq polymerase, the best condition for PCR optimization was 60ng template DNA, 4.5mM MgCl2, and 1unit taq polymerase. Reaction temperatures for the optimal PCR condition were 84℃, 32℃, 62℃; 90℃, 40℃, 72℃; and 92℃, 36℃, 72℃.

VDSL채널에서 정규화된 MMA 방법을 이용한 블라인드 적응 등화 기법

최성환,김한기,권호열 강원대학교 정보통신연구소 2001 정보통신논문지 Vol.5 No.-

VDSL technology can transmit data at rate of 10-50Mbps over a twisted-pair copper telephone loops. Therefore, one of VDSL core technology is channel equalizer. Because one of the most damaging impairments is linear distortion introduced by cable and RF interference. An adaptive equalizer needs to be trained before reliable transfer of information can be achieved. This can be done in two main ways. One way is to using priori known training sequence. The ocher way is not to using training sequence. This type of initial training of an equalizer is called blind equalization. Blind equalization provide bandwidth-efficient schemes. In this paper we propose dual mode SCS(Soft Constraint Satisfaction)-Multimodulus algorithm derived from the combination of SCS algorithms and decision-directed algorithm. This algorithms provide fast convergence speed and robustness. Using MATLAB, we investigate the performance of dual made SCS-MMA over VDSL test loops.