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>

야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로

조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6

Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.

PLCM을 이용한 카오스 블록 암호화 기법

이성우,이민구,박정렬,신재호 東國大學敎 産業技術硏究院 2005 산업기술논문집 Vol.15 No.1

본 논문에서는 동력학적 특성이 좋은 PLCM을 이용한 256비트 길이의 암호 키와 32비트 데이터 블록의 카오스 블록 암호화 기법을 제안한다. 본 논문에서 제안한 기법은 256비트의 키에서 각 암호화 단계마다 사용될 32비트의 세션 키 두 개를 생성해서 PLCM의 초기 값과 반복회수를 결정하는데 사용한다. 본 제안 기법은 피드백 구조와 대치 기능의 S함수를 통해 암호 강도를 향상시켰다. 또한 실험 결과와 안전성 분석을 통해 본 제안 기법이 통계적(Statistical) 공격에 매우 강함을 보여준다. In this paper, we propose a chaotic block encryption scheme using a PLCM (Piecewise Linear Chaotic Map) having a good dynamical property. The proposed scheme has a block size of 32 bits and a key size of 256 bits. In the proposed scheme we use two 32-bit session keys generated from 256-bit key to decide the initial value and the number of iteration of PLCM. To enhance the strength of security we use a feedback structure and a S (Substitution) function. With results of test and analyses of security we show the proposed scheme is very secure against statistical attacks.

정신분열병 환자의 환시에 관한 임상적 연구

이상열,소광,이귀행,박민철 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.1

환시가 있는 정신분열병 환자가 어떻게 환시를 지각하고 있는지 이해하고 그들의 정신병리를 파악하여 효과적인 평가 및 치료에 도움을 주고자 본 연구를 시행하였다. 1991년 3월 1일부터 1992년 2월 28일 까지 DSM-III-R의 진단기준에 따라 정신분열병으로 입원한 환자 중 현재 지각하고 있는 환시를 그린 환자 40명을 대상으로 환시의 의미와 내용, 환시에 대한 정서적 반응 및 행동을 조사하였다. 또한 환시군과 대조군과의 간이정신상태검사와 간이정신평정척도를 비교하였으며, 환시의 의미와 환자의 망상 형태사이의 상관성, 환시에 대한 믿음의 강도, 환시의 빈도, 일회 삽화기간과 간이정신평정척도와의 상관성, 환시군의 간이정성평정척도 각 항목간의 상관성을 조사하였으며 결과는 다음과 같다. 1) 지각하고 있는 환시의 대상은 사람의 형태를 지닌 신화적인 인물, 의미는 피해적, 위치는 일상적 시야 범위 내의 근접거리, 빈도는 일주일에 한번 미만, 일회 삽화기간은 1∼5분, 정서적 반응은 부정적 반응, 환시에 대한 행동은 언어적 행동 또는 제한된 신체적 행동이 가장 많았다. 2) 환시의 의미와 망상의 내용사이에는 정적인 상관관계가 있었다. 3) 환시군은 환시 및 환각이 없는 군에 비해 불안, 환각적 행동, 비일상적 사고내용이 유의하게 많았다. 4) 환시 사실성에 대한 믿음의 강도와 환각 행동, 일회 삽화기간과 불안, 긴장, 운동성 지연 간에 정적인 상관이 있었다. 5) 환시군에서 간이 정신평정 척도상 환각적 행동항목과 불안, 환각적 행동과 매너리즘과 기묘한 자세취하기, 환각적 행동과 흥분, 환각적 행동과 운동성 지연에 각각의 정적인 상관이 있었다. 또한 운동성 지연과 긴장감, 무딘 감정과 긴장감, 감정적으로 움추러듬과 긴장감 사이에 각각 정적인 상관이 있었다. 본 연구의 결과들은 정신분열병 환자가 환시를 실제로 어떻게 지각하고 있는가를 임상가가 평가해야 하는 필요성을 나타내고 있다. Objective : The purpose of this study was to investigate actual visual hallucinations as perceived by 40 schizophrenic patients and, subsequently, to explore their psychopathology in order to assist clinicians in more effectively evaluating and treating the visual hallucination. Methods : With the authors' guidance, the content and meaning of pictures drawn, according to their perceptions, by 40 schizophrenic patients were evaluated in conjunction with an examination of the patient's emotional reaction and associated behavior. The results from the visual hallucination group were analyzed and then compared with non-visual hallucinatory control group using the Brief Psychiatric Rating Scale(BPRS). On this basis, the authors investigated the correlations between patients' strength of confidence in visual hallucination, frequency of visual hallucination, mean duration of an episode and the score of BPRS, and the correlation between meaning of visual hallucination and the type of patient's delusion. Finally the authors attempted to derive correlation among the items of BPRS. Results : 1) The content of visual hallucination was mostly non-human and mythologically exhibiting anthropomorphic qualities while its meaning was frequently persecutory. In addition, the visual hallucinations experienced by the subjects were most often close to or within the patients' ordinary visual range with mean duration of hallucinatory episodes ranging from 1 to 5 minutes. The most frequent reaction of patients is a negative emotional response and the most frequent overt behavior was either verbal or restricted physical activity. 2) There was a positive correlation between the meaning of the visual hallucination and the type of patients' delusion. 3) The group having visual hallucinations had more frequent anxiety, hallucinatory behavior and unusual thought content compared to the non-visual hallucination group. 4) There were positive correlations between patients' strength of confidence in visual hallucination and hallucinatory behavior and among anxiety, tension, motor retardation and mean duration of episodes of visual hallucination. 5) There were positive correlations between hallucinatory behavior and anxiety, hallucinatory behavior and mannerism and posturing, hallucinatory behavior and excitement, and hallucinatory behavior and motor retardation. Also, there were positive correlations between motor retardation and tension, blunted affect and tension, and between emotional withdrawal and tension among each item of BPRS in the visual hallucination group. Conclusion : In this study of visual hallucinations in schizophrenics, the authors concluded that it is helpful for clinicians to evaluate how schizophrenic patients experience their visual hallucination.

신경정신과 입원환자에 적용된 정신치료극의 치유인자

이상열,박민철 圓光大學校 醫科學硏究所 1995 圓光醫科學 Vol.11 No.1

In order to invesgate the curative factors of psychodrama we evaluated the 11 therapeutic factors that had been introduced by Yalom in the protagonists of psyhciatric inpatients. The protagonists were 38 patients who were hospitalized in Wonkwang University Psychiatric Hospital from Sep. 1994 to Aug. 1995. We studied demographic characteristics of the protagonist and the difference of curative factors between realistic group of protagonist and unrealistic protagonist group. The results were as follows : 1) The demographicl characteristics were that mean age of protagonist was 27.9±5.8, sex ratio of male and female was 22(57.9%) : 16(42.1%), marrital status of protagonists were single 12(31.6%), married 12(31.6%) and divorced 4(10.5%), and religious status of protagonist were christian 24(63.2%), irreligion 8(21.1%), catholic 5(13.2%) and others was 1(2.6%). Also, mean educactional year of protagonist was 12.4±3.8 years and mean hospitalization period was 58.8±21.7 months. 2) The psychiatric diagnosis of the protagonist were composed of schizophrenic and schizophreniform disorder 18(47.4%), mood disorder 13(34.2%), schizoaffective disorder 3(7.9%), personality disorder 2(5.3%). alcohol dependence 1(2.6%) and organic mental disorder 1(2.6%). 3)The important curative factors which was evaluated by director and auxillary ego were catharsis, instillation of hope, and group cohesiveness in order. 4)There was no difference in the curative factors between realistic group and unrealistic group except imitative behavior(p(0.05).

재래종 참외 종자 및 생육초기 주요형질의 유전력과 상관관계 분석

이상우,박상현,강호종,안상열,채윤석,김주현 진주산업대학교 농업기술연구소 2000 農業技術硏究所報 Vol.13 No.-

This experiment was conducted to obtain some basic imformation for korean native oriental melon breeding. Genetic variability, heritability, and correlation on 13 characters were analyzed. The results are summarized as follows; 1. Among 13 characters, plant height and length of lateral shoot showed high level of GCV(110-362%) and ECV(89-101%). The rest characters showed low level of GCV(7-21%) and ECV(0.16-9%). 2. Heritabilities of 13 characters investigated were high as over 50%. Especially those of hypocotyl length, 100-seed weigth and seed width were very high (> 95%). 3. High level correlation values were observed among seed characters and seedling characters. 4. Plant characters of early growth stage, except leaf stalk length, were not related with characters of seed or seedling 5. In early plant growth stage, plant height and length of lateral shoot were correlated positively with number of node, number of lateral shoot, leaf length and leaf width.

PC 클러스터를 이용한 수치최적의설계의 병렬처리

이상경,조창열 울산대학교 2001 공학연구논문집 Vol.32 No.2

3차원 천음속 날개의 공력형상 설계최적화를 위하여 저렴한 비용의 PC 클러스터를 제작하였다. 클러스터는 3개의 노드로 구성되었으며, 리눅스 0S를 설치하고 메시지 전달방식의 통신 라이브러리인 MPI(Message Passing Interface)를 사용하였다. 이 시스템을 이용하여 24개의 설계변수를 가진 3차원 천음속 날개의 항력최소화 문제를 해석하였다. 유동장 해석을 위해 오일러 코드를 사용하였고, 일반적인 영역분할방식의 유동장 병렬처리를 택하는 대신에 수치최적화 알고리즘 중 민감도를 계산하는 부분을 병렬처리 하였다. 설계결과는 단일 노드를 사용한 순차계산의 결과와 동일하였으나, 설계 소요시간은 큰 폭으로 감소하였다. 본 연구의 결과로 저렴한 비용으로 우수한 성능을 갖춘 3차원 항공기 날개의 형상최 적설계 시스템을 구성할 수 있었으며, 향 후 이를 이용하여 보다 복잡하고 정교한 전산원용설계시스템으로 발전할 수 있는 기초를 마련하였다. A cheap FC-Cluster was assembled for the aerodynamic design optimization of three dimensional transonic wing. The cluster has 3 nodes in which Linux Operating System and MPI as message passing library are installed. The system was applied to solve a wave drag minimization problem for transonic wing with 24 design variables. The Euler method was used to solve the flow around the wing, The process of sensitivity-derivative computation was parallelized in the numerical optimization algorithm, instead of using domain decomposition technique as usual parallel processing in the computational fluid dynamics. The design result with the parallel processing is exactly same as the one with the serial computation, while the parallel computation time was considerably reduced. The cheap shape optimization system based on the PC-cluster developed here could be a starting of the computer-aided design system with more sophisticated geometry generating module and flow analysis methods in the future.

효율적인 모바일 서비스를 위한 하이브리드 스트리밍 아키텍처

이성용,최황규,최창열 강원대학교 정보통신연구소 2005 정보통신논문지 Vol.9 No.-

To provide the seamless multimedia streaming service for mobile users, both performance of the mobile device and bandwidth constraint of the wireless network should be considered. Recently, in order to solve these problems, the QoS adaptive architectures as well as additional features are being devised. In this paper, we designed and implemented a hybrid architecture-based mobile media streaming system under the Linux environment. The implemented system features as follows. First, a hybrid architecture which complements shortcomings of the static and dynamic architectures is presented. The hybrid architecture is able to maximize the proxy utilization rate by dividing the proxy into the related functions according to computation and disk access rate. Second, the new resource monitoring scheme that efficiently manages resource of the proxy is proposed. Third, the work prediction module is added to choose exactly the proxy which finish the task earlier than others. The experimental results demonstrate that our system decreases not only the user-perceived latency, but also the proxy overload. Furthermore, it has an advantage of reducing the traffic between the proxy and the system manager.

성견에서 수직적 골결손부에 골이식후 교정력 적용시기에 따른 치주조직의 반응

이상열,황현식,김경근 전남대학교 치과대학 2000 전남치대논문집 Vol.12 No.1

The aim of this study was to investigate the periodontal response according to the timing of orthodontic force application after bone graft into the angular bony defect. Nine dogs were divided into three groups, 2, 4, and 6 weeks, according to the timing of orthodontic force application after bone graft. Periodontal angular bony defects were created surgically at the distal aspect of both maxillary third incisors. Two weeks later, flap operation was performed to eliminate inflammation and reference notch was made on the root surface at the level of the bottom of each defect. Demineralized freeze-dried bone was implanted on the left side whereas only debridement was done on the other side. Experimental tooth movement was executed during 8 weeks on both graft and non-graft sides. After 2 weeks of retention period, animals were sacrificed for histologic specimens. The results were obtained as follows: 1. New bone formation was more pronounced in the graft side than in the non-graft side in all experimental animals. 2. In the 6-week group, new bone and cementum formation was observed in more than half from the notch to the cemento-enamel junction, and the zone of connective tissue attachment was found without apical migration of junctional epithelium. 3. In the 4-week group, the amount of new bone formation was smaller than in the 6-week group whereas the overall remodeling pattern was similar. 4. New bone formation was confined to around the notch and the junctional epithelium migrated apically to the level of the notch with no connective tissue attachment and cementum formation in the 2-week group. The results of the present study suggest that periodontal response may be influenced by the timing of orthodontic force application after bone graft into angular bony defect.

조정선수의 호흡순환 기능 및 에너지 대사

이상우,박태열,김주혁 東亞大學校附設스포츠科學硏究所 1996 스포츠科學硏究論文集 Vol.14 No.-

The purpose of this study was to evaluate of the cardiorespiatory function and energy expenditure in men-rowing. The subjects were two groups; men rowing group in which career had for 5.4 ±1.13 year, Control group were college students. They did exercise with start speed of 120m/min without treadmill slope, the speed was incremental 20m/min per two minute and they were finally led to exhaustion. The results were as follows; 1. The cardiorespiratory was non-significant difference in rest, during maximum exercise ventilation was 162.6 ±11.69ℓ/min in rowing group, 142.3 ±21.34ℓ/min in control group. ?? o₂max/kg was 61.5 ±4.91㎖/kg/min in control group. The ????, RR ?? o₂, ??o₂/kg were significant difference in during maximum exercise. 2. The energy expenditure was non-significant in rest. The EQO₂was significant difference in rest. The MET in during maximum exercise was 21.2 ±2.67 in rowing group, 18.7 ±4.56 in control group, the cal/day was 5,864.5 ±341.47Kcal in rowing group, 4,662.6 ±563.67Kcal in control group.