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>

양측성 관상동정맥루 1예

최용원,오석규,이재훈,이상재,권경희,최은경,김남호,정진원 圓光大學校 醫科學硏究所 2002 圓光醫科學 Vol.17 No.1

저자들은 호흡곤란, 흉부불쾌감, 심계항진 등을 주소로 내원한 환자에서 경흉부 및 경식도 심초음파 검사상 주폐동맥에서 이완기에 전행하는 지속적인 혈류의 흐름을 관찰하고, 관상동맥 조영술을 통해 좌전하행지 중간부위와 우관상동맥 근위부에서 각각 기시하여 공통경로를 이루면서 주폐동맥으로 유입되는 양측성 관상동정맥루를 보이는 드문 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. A coronary arteriovenous fistula is infrequently encountered vascular communication between a coronary artery and a cardiac chamber, a great artery or the vena cava. It is the most common congenital anomaly that can affect coronary perfusion. Bilateral involvement of coronary fistula constitutes an uncommon subgroup of coronary arteriovenous fistulas. A 69 year-old female patient presented with chest discomfort, palpitation, and dyspnea. In the echocardiography, doppler color flow imaging visualized abnormal flow signals with mosaic appearance in the main pulmonary artery during diastolic phase. Coronary angiography revealed arteriovenous fistula arising from the left anterior descending artery and the right coronary artery. Both coronary arteriovenous fistulas drained into the main pulmonary artery. We report a case of bilateral coronary arteriovenous fistula that was confirmed by echocariography and coronary angiography.

프로그램화 된 신체운동이 ADHD 아동의 주의산만행동과 과잉행동에 미치는 효과

최재원(Jae Won Choi),강경두(Kyoung Doo Kang),정혜연(Hye Yeon Jung) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.47

The purpose of this study is to deeply analyze a change of the programmed physical exercise in attentiondeficient behavior and hyperactivity of children with ADHD, through the single-subject research design method. The research subjects were 4 elementary school students who are under being cured due to being judged to be ADHD at Child Psychiatric Clinic for C University Hospital where is located in Seoul at that time of beginning experiment in order to be conformed with the objective of research. For visual observation, the attention-deficient behavior was used the frequency-typed case sampling method(Shin So-yeon, Park Jaeguk, Kim Yeong-mi, Lee Hwa-eun, 2007). Observation of hyperactivity was used the contents, which Carlson and Hotfield(1991) defined, by referring to the contents by Mun Jae-gyeong(1998). The following are the results that were elicited through the research procedure of this study. First, the programmed physical exercise was indicated to reduce attention-deficient behavior in children with ADHD. Second, the programmed physical exercise was indicated to reduce hyperactivity in children with ADHD.

열공형과 비열공형 피질하 혈관성 치매에서 위험인자의 차이에 관한 비교 연구

배희준,정지향,유경호,나덕렬,김상윤,최경규,양동원,손의주,이상도,김재우,박경원,김응규,이재홍,박미영,한일우,함동석,최문성,하충건,최성혜,이애영,이병철,한설희 대한치매학회 2003 Dementia and Neurocognitive Disorders Vol.2 No.2

Backgrounds and Objectives: Vascular dementia is a group of dementing disoders arising from various stroke syndrome. Among these. subcortical ischemic vascular dementia (SIVD) is regarded as a relatively distinct clinical entity. However, MRI patterns of SIVD are not homogenous. In some patients, lacunes are dominant, and in others, subcortical white matter changes are. This study was designed to compare risk factor profiles between SIVD with and without multiple lacunes. Methods: We divided 47 subjects (22 males, mean age. 68 years) recruited from VADAPET (Multicenter Trial For Evaluation Of The Changes In the PET Images Of Subcortical Vascular Dementia Patient) study into two groups one with more than 5 lacunes in deep gray matter (lacune group) and the other with 5 or less(non-lacune group) Clinical characteristics and laboratory findings of two groups were compared. Results: Nineteen of 47 patients (40%) belonged to the lacune group. The lacune and non-lacune groups d d not differ in the following variables: age, hypertension, diabetes mellitus, hyperlipidemia heart disease, history of stroke or TIA, history of trauma or major surgery, family history of hypertension stroke, or dementia, age at diagnosis of dementia, body mass index, white blood cell count, ESR, CRP, fibrinogen, hemoglobin A1C, total cholesterol. LDL cholesterol creatinine, proteinuria, glucosuria, and microhematuria. However, male sex, smoking alcohol. hemoglobin, and HDL cholesterol were possibly associated more with lacune group SIVD than with non-lacune group (p<0 1) Multivariate analyses revealed that smoking, hemoglobin, and HDL cholesterol were independent predictors of SIVD with multiple lacunes Conclusion: Our study suggests that SIVD with multiple lacunes may be significantly different in smoking habits hemoglobin, and HDL cholesterol from SIVD without multiple lacunes.

백서 척수후근절로부터 슈반세포의 효과적인 체외 배양법

김성민,이종호,김남열,안강민,최원재,최시호,차미주,이주영,황순정,장정원,명훈,최진영,서병무,정필훈,김명진 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.4

Schwann cells(SCs), an important component of the peripheral nervous system, intract with nerous to mutually support growth and replication for the peripheral nerve regentation. Recently, ading SCs to the lumen of guidance channel is widely tried to improve regeneration or to make regeneration possible over otherwise irreparable gaps. however, it is not easy to isolate and multiplicate SCs as much as enough to help the axonal regeneration. For the allogeneic SCs source for tubular nerve guidance, we developed a little bit improved technique of harvesting and multiplicating SCs. by culturing dispersed dorsal root ganglia in specially designed medium with growth factors and serial processing, we repeatedlly generate relatively homogenous SC cultures. Our technique was compared with other methods of literature using immunostaining methods such as GFAP, S100, BDNF and the total SC count assessment at different time interval after primary culture.

B-ISDN 프로토콜 내장의 인터넷 폰 교환시스템의 구현

최재원 경성대학교 공학기술연구소 2005 공학기술연구지 Vol.12 No.-

In this paper we researched on the implementation of the B-ISDN protocol embedded Internet-Phone PBX System for the previous telephone exchange and communication. We suggested implementation methods of the Internet-Phone PBX System, designed the structure of the user terminal and exchange server, designed call control message flows for user's communication and showed core programming codes for the system implementation.

고속·고정밀 금형가공센터 개발

최원선,김태형,이재윤 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-

In order to manufacture a precision mold/die by machining, users need high speed & precision mold/die machining center. So, for development of this machine, we intend to use linear motor that is instead of ball-screw, servo-motor and coupling, high-speed spindle of pressurized air journal bearing and composite materials. In this paper we research column moving type and table moving type. The former is mainly piling 3 axes on one moving body, the latter is consist of two independent carriages. Both types are available to high speed & precision machine, but we finally draw a conclusion column moving type due to an advantage of high-speed control of linear motor.

운동경력이 중·고 여자 운동선수들의 월경상태에 미치는 영향

최종인,오재원 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.3

This study is to investigate the menstrual conditions of Middle and High School girl students according to their athletic careers. The questionnaire survey was made among 150 athleltic girl students who experienced menarche in Chung-nam Province. The students were divided into three groups according to their athletic careers : A group was under two years, B group was between two years and 4 years, C group was over 4 years. The groups were contrasted, analyzed , and tested significantly using x²test. The results are as follows : 1. Most groups responded that the menstural cycle according to the athletic careers were irregular without showing any significant difference. The menstural cycle tended to be shorter among the groups with a lot of athletic careers. More groups responded that the menstrual amounts were common among most groups. Menstural amounts tended to be less among the group with a lot of athletic careers but there was no significant difference. But mentrual period tended to be shorter among the group B,C with athletic careers over two years than the group A under two years(p<.01). 2. The subjective symptoms during menstruation were not significantly founded but most group A,B,C felt Abdominal Cramp, Unpleasantness a lot and Back pain a little. but the group with a lot of athletic carees tended to feelt subjective symptoms during menstruation 3. In the premenstrual syndrome, the group with much athletic careers felt more significantly (p<.01).

직교이방성 압축재의 판요소의 탄성구속효과를 고려한 국부좌굴

崔在賢,李元福 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1

The mechanical properties of fiber reinforced plastic materials produced by pultrusion process are usually considered as an otrhotropic. Due to the attractive material properties, this material is regarded as an alternative of conventional construction materials. But the research on analysis and design for the orthotropic structural member is not enough to set up the design criteria. It is the reason why it is not used versatilely in construction field. In this research, local buckling analysis of orthotropic compression members is performed using equilibrium approach with the assumptions relating to the common edges of plate components. In the compression members, boundary conditions of common edges change due to elastic constraining effect of adjacent plates with various ratios of width to thickness. To perform local buckling analysis of structural members, buckling analysis of a plate having boundary conditions which is restrained by adjacent plates is performed. For an orthotropic plate the loaded edges are considered to be simply-supported and the side edges are assumed to have arbitrary boundary conditions. Local buckling analysis is performed by the closed-form approach and energy approach which is more convenient and easier than the closed-form approach. Approximate solution similar to energy solution but giving exact result like that of a closed-form solution is also suggested. The minimum buckling coefficients with respect to the ratio of width to thickness for the rectangular box, channel and zee section columns are shown graphically. Using the approximate buckling equation, the dominant plate component for the local buckling of the structural shapes is also investigated and the result is plotted on the curve mentioned above. Simple verification of the equation derived is performed by changing the orthotropic mechanical properties to isotropic ones and it is observed that the result is identical with that in published document.

내열 복합재료용 모재 수지의 개질 연구

최원종,이재락,윤상근 한국항공대학교 1995 論文集 Vol.33 No.-

내열 복합재료용 모재 수지의 개질 특성과 공정 변수에 대한 연구를 위하여, N.BMI를 첨가한 에폭시 수지를 모재로 하는 적층판의 물성이 N.BMI의 첨가량에 따라 변화하는 것을 알아보기 위하여 기계적 물성 실험을 실시하였으며, 또한 승온속도의 영향을 알아보기 위하여 DSC와 TGA를 이용한 열분석을 수행하였다. 실험 결과, 승온속도가 빠른 경우 peak 온도가 지정 경화온도보다 높게 나타나므로 모재 수지의 불균일 경화반응이 일어날 수있음을 알수 있었다. 내열성 향상을 위해 N.BMI를 첨가하는 경우 10% 함유량에서 가장 우수한 특성을 나타내었다. The purpose of this project is to study the influence of heat-up rateduring cure cycle on the homogeneity of cured matrix resin and the effects of resin formulation on the thermal properties of fiber reinforced composite materials. The results of DSC analysis show that with the rapid heat-up rate, the homogeneity of matrix resin can not be achieved during normal cure cycle. The TG analyses have been performed on the various types of epoxy matrix resins. The results show that the formulation with BMI is stable to the temperature of 348℃ which is comparable to that of 350°F type prepreg.