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>

유연구조물의 진동제어를 위한 압전작동기의 응용

성윤경,이규태 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1

The paper presents the modeling and optimal control for the reduction of transverse vibration of simply supported beam under a moving mass. The equations of motion are derived by using assumed mode method. The coriolis and centripetal accelerations are accommodated in the equations of motion to account for the dynamic effect of the traveling mass. In order to reduce the transverse vibration of the beam, an optimal controller with full state feedback is designed based on the linearized equations of motion. The optimal actuator locations are determined with the evaluation of an optimal cost functional defined by the worst initial condition with the trade-off of controlled mode performance. Numerical simulations are performed with respect to various velocities and different traveling masses. Even if the velocity of the traveling mass reaches to the critical speed which can cause the resonance of the beam, the controller with two piezoelectric actuators shows the excellent performance under severe time-varying disturbances of the system.

두꺼운 적층 복합재료 구조물 해석을 위한 3차원 복합재 적층 육면체 요소의 개발

윤영복,하성규 漢陽大學校 工學技術硏究所 1998 工學技術論文集 Vol.7 No.1

3차원 적층 복합재 구조물의 해석을 위한 3차원 다적층 복합재 육면체 요소가 적층정보 자동 입력 모듈과 함께 제안되었다. 개발된 요소는 요소내에 다양한 물성치 정보를 포함하며 가장자리에 적층 절단면이 존재하는 요소의 해석이 가능한 ply-drop-off요소이다. 요소의 정확도가 엄밀해와의 변위 및 면내응력의 비교를 통해 검증되었다 개발원 요소는 전형적인 유한요소법에 손쉬운 정식화 및 적용이 가능하며 개발된 요소와 제안된 적층정보 인식 모듈은 엄밀해와 비교, 검증되었다. 본 요소를 사용함으로써 정확도의 변화없이 해석시간과 저장용량 및 요소를 현저히 줄일 수 있다. A three-dimensional multilayered brick element with automatic input module of layup information in the element is developed to analyze the behavior of complicated three dimensional laminated composite structures. The developed element can contain the varying material properties within the element and allow the ply-drop-off along the element edges. The accuracy of the displacement using the element is well verified with the analytical solution. The computer time and memory space can be significantly saved using the ply-drop-off element. This method is easy to formulate and apply for the conventional finite element method. Exact solution is compared with the results using the developed element and proposed method. While the number of element is quite reduced, the results still have a satisfactory accuracy.

비글개에서 신원방우황청심원의 급성 및 아급성독성시험

성하정,권오경,방명주,곽형일,이진영,신대희,박대규,정규혁,윤효인,조명행 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1

Single and 4 weeks oral administration of New wonbangwoohwangchungsimwon (NSCH) which was used l-muscone as substitutive material of musk, to beagle dogs of both sexes were performed to investigate both acute and subacute toxicity. Beagle dogs (3 males and 3 females) in acute experiments were administered orally with sinlge dose of 2,000 ㎎/㎏ and groups of 9 male and 9 female beagle dogs in subacute experiments were given daily different dosage of NSCH, 160 ㎎/㎏/day (low dosage group), 400 ㎎/㎏/day (middle dosage group), 1,000 ㎎/㎏/day (high dosage group) once a day for 4 weeks by oral route according to the Established Regulation of Korea Food and Drug Administration (1996. 4. 16). LD_50 value for beagle dogs was more than 2,000 ㎎/㎏ per oral for both male and females. In animals administered with NSCH, there were neither dead animals nor significant changes of body weights. In addition, no differences were found between control and treated groups in clinical sign, urinalysis, eye examination, hematology, serum chemistry, organ weight and other fingings. No histological lesions were observed in both control and treatment groups. Above data strongly suggset that NSCH in beagle dogs is considered to be safe.

방광 이행상피암에서 argyrophilic nucleolar organizer regions의 의의

윤율로,송규상 충남대학교 의과대학 지역사회의학연구소 1992 충남의대잡지 Vol.19 No.2

Using a silver staining technique, nucleolar organizer regions(AgNORs) were identified in routinely processed paraffin sections of transitional carcinoma of baldder which were selected from the 37 patients diagnosed in the Depart. of Urology, Changnam University Hospital, during the period July 1986 to July 1992. The technique showed as follows. 1. Argyrophilic nucleolar organizer regions(AgNORs) were seen as sharply defined dark brownish dots in the almost all nuclei of tumor cells. The nuclei were stained as brownish color and cytoplasms as more light brown color. 2. The Mean scores of AgNORs were 1.07 ± 0.04 in Chronic cystitis, 1.52 ± 0.31 in Grade Ⅰ, 1.99 ± 0.04 in Grade Ⅱ, 3.21 ± 1.20 in Grade Ⅲ, 5.24 ± 1.20 in Grade Ⅳ of the transitional carcinoma of the bladder. Using Kruskal-Wallis test the mean scores of AgNORs among each group showed a statistically significant differences(P value < 0.001). 3. The mean scores of AgNORs of each stage of tumor 2.61 ± 1.44 in Stage Ⅰ, 2.56 ± 1.20 in Stage Ⅱ, 3.40 ± 1.99 in Stage Ⅲ, 3.76 ± 1.37. There was no statistical significant differences among the each group of stage(P value > 0.5). 4. No significant correlation was obtained between AgNORs and tumor size or number. 5. The well defined inverse relationship was observed between AgNORs numbers and their sizes. The numbers of AgNORs rises with decreasing differences and increasing malignancy. Thus, the standardized assessement of argyrophilic nucleolar organizer regions can be easily performed by any surgical pathology laboratory without specialized equipment and may be useful as an good indicator of proliferative activity of tumor cell or biological behavior.

단일 치근을 가진 하악 제1유구치

윤상일,최형준,김성오,이제호,손흥규 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.4

본 증례에서는 단일 치근을 가진 하악 제1유구치에 대해 서술하고자 한다. 5세 남아의 하악 제1유구치는 방사선 사진 검사결과 양측성으로 분명한 단일치근을 가진 것으로 나타났다. 보통 상악 구치는 3개의 치근을, 하악 구치는 2개의 치근을 가지나, 치아의 발육시기도중 Hertwig상피근초가 제 시기에 적절히 함입되지 못하면 치근이 서로 나뉘지 못하여 치근의 융합이 발생될 수 있다. 융합된 치근을 가진 구치는 정상적인 구치보다 불리한 치관-치근 비율을 가질 뿐 아니라, 여러 보고에 의하면 융합된 치근을 가진 사람은 다수 치아의 선천적 결손이나, 상악 전치에서 치내치가 발현될 확률이 높아 예방적 치과 치료가 필요할 수 있다. 그리고, 외배엽이형성증, 합지증, 만지증, 청색공막증과 같은 전신 질환과 연관되어 나타날 수도 있다고 한다. 치근융합은 유전적으로 상염색체 열성 유전을 따른다고 밝혀진 바 있다. 현재까지 단일 치근을 가진 구치는 대부분 영구 구치에서 많이 보고된 바 있지만, 유구치에서는 거의 보고된 바가 없기에 이에 보고하는 바이다. In this case, we would like to discuss about the single rooted deciduous mandibular first molar. The deciduous mandibular molar of a five years old boy was shown to have a single root, bilaterally. Ordinarily, the maxilary molars have three roots and the mandibular molars have two roots. However, when the hertwig's epithelial root sheath do not invaginate properly during tooth development, root fusion can occur from the absence of root separation. Molars with fused roots not only have unfavorable crown to root ratio, but also according to many reports, have higher probability of having multiple congenitally missing teeth or dens invaginatus in the maxillary incisors, consequently requiring preventive dental treatment. In addition, disorders such as ectodermal dysplasia, syndactyly, clinodactyly, bluish sclera can also be related to this condition. Root fusion is known to be of autosomal recessive inheritance. Up to date, single rooted molars have been reported several times in permanent dentitions but hardly in deciduous dentition, which is the motive for this paper.

음향방출법에 의한 탄소섬유강화 플라스틱의 파괴 특성에 관한 연구 (1)

윤종희,박성완,이장규,우창기 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

The object of this study is to investigate a fracture characteristics of static tensile test as a function of acoustic emission according to the fiber orientation θ=0?in carbon/epoxy composites, CFRP. On tensile loading, it was recognized that the fracture characteristics of CFRP in a unidirectional composites. Using the results of the AE analysis(a=2㎜), it was found that the amplitude distributions of AE signals corresponding the matrix cracking, fiber debonding or delamination, and fiber breaking are 55~70㏈(<200sec), 100㏈(200~600sec), and 80㏈(>600sec).

로봇의 3D 물체인식을 위한 Vision Algorithm

성윤경,이규태 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1

The robot and machine vision technology has been developed for automatic fruit harvest. The most important subject in developing fruit harvesting robots is accurately to locate fruits on the given coordinate system. In this paper, we employ average color values (Red. Green, Blue), area, center position, compactness, perimeter and chain-coding information of specific regions, to detect and locate fruits in space. Especially, a new approach is presented to judge whether an extracted region is, overlapped or partially occluded by deleting or separating the region of an image.

地域經濟活性化를 위한 農村市場開發에 관한 硏究 : 忠南 禮山地域市場을 中心으로

尹畯相,李武鉉,申尹撤,洪性贊,朴奉圭 公州大學校 産業開發硏究所 1994 産業開發硏究 Vol.2 No.-

Since the first year economic development plan, imblanced development of national territory during the economic development process has aggravated remarkable disparity between urban and rural areas. For this reason, this study introduced the development of rural market as one of the development strategies of regional economic to correct the imblance and relieve regional disparity. The purpose of this study were to look into the present situation of traditional rural market and to analyze the problems for the rural development in view of the current road situations in the rural areas and status of marketing facilities in market center and to measure the degree of rural area people's satisfaction to the rural market and to suggest the development plan of activating for rural market center. To collect data, the Yesan Gun rural market were selected and a total of 591 residents and 178 merchants were sampled as final subjects of survey. Interview and/or questionnaire method was the main method of data collection. The major findings of this study were as follows: 1) The population of Yesan Gun has decreased 2.85 persons per year from in 1984, but the number of vehicles were increased 2.85 times than in 1989. And the parking capacity of Yesan Eup was only 129 vehicles which were below of the total vehicles of Yesan Gun area (14,352). The number of Yesan area markets were 8 markets which consisted of 1 permanent market and 7 periodic markets. But as the economy has been developed, the conditions of rural markets have been changing. That is, the role of periodic market tends to be weakened with the growth of large cities, reinforcement of permanent markets, development of traffic facilities, large production, preferring high quality goods. 3) Generally, the people of Yesan Gun were attached for purchasing the necessaries of life and comodities and farming materials to ① Yesan Eup ② Seoul ③ Chonan Shi ④ Hongsung gun ⑤ Daejeon Shi. 4) The degree of community people's satisfaction to the town market presented 26.6% which meaned higher than dissatisfaction(9.5%). And the degree of people's inconvenience of accessibility to market center by transferring of bus terminal presented 64.2% which meaned higher than average. 5) The degree of people's dissatisfaction of traffic system in Yesan gun area presented followings: the road networks(61.5%), parking facility(68%), bus route(54%). 6) By the survey of merchants of Yesan gun area, on the average, it showed followings: the size of store was 6-10 pyeong(40%), the type of enterprise was retail dealer(70.9%), and purchasing place was wholesale dealer from Seoul(51.8%). 7) And they thought that Yesan town market were too small(70.8%), and the diversifying of goods was not enough(35.5%). 8) The merchants of Yesan area showed that the degree of into venience to traffic system was 72.7% and its to parking facility was 83.3%. And they complained that community administration agency have not tried to activate market(79.1%). Based on the results of this study, the following recommendation were made for activating regional economy and community market. That is, it is to strengthen the economic function in community market so as to suffice the economic and social activities for settlement area as their living space. And it is necessary to improve the interrelationship of the central functions. 1) So, the accessibility between market center and its surrounding areas must be rised. ① the enforcing preferentially to pave the bus terminal and market center to link two place. ② the running of shuttle-bus two place every regular market day. ③ the widening and connecting the road to rise accessibility between market center and its surrounding area. ④ the enforcement of parking facility around market center. ⑤ the constructing marketing centered area as intergrated body of various marketing facilities in the adjacent site is the centered area planned to achieve efficient marketing. 2) The modernization and specialization market center facilities. 3) The strengthening of drawing surrounding area people into Yesan market center. So, the following recommended: ① the development of special products market ② inducing special projects ③ the development tour and leisure course drawing industrial facilities. 4) And it needs to enforce community people's local patriotism and to support community markets by administration agency.

타이어 설계인자를 고려한 자동차의 조종 및 안정 특성에 관한 연구

윤성운,홍석주,최규남 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2

As the technique of automobile industry is being advanced, the advancement of performance for vehicle is being required. In order to achieve this purpose, the study on the handling and stability which are produced by moving vehicle is carried out actively. Ability to predict vehicle performance using computer simulation is essential to reducing the development time for tire companies as well as car makers. From the previous research. we showed that handling simulation tool developed for J-turn and lane change maneuvers on ADAMS could be used in predicting the performance difference among tires with different specifications in vehicle mild handling behaviors. Through this study, some meaningful correlations were achieved. Also barriers to direct application of the simulation technique to tire development process and several technical problems that should be resolved were iden tified. In this results, ability to predict vehicle performance using computer simulation is essential to reducing the development time for tire companies as well as car makers.