<tex> ${\rm TmBa}_{2}{\rm Cu}_{3}{\rm O}_{7-{\rm x}}$</tex> Superconducting Thin Films Grown by Pulsed Laser Deposition

Rock-Kil Ko,O-Jong Kwon,Kyu-Jeong Song,Ahmad, D.,Chan Park,Joon-Ho Lee,Seung-Su An,Nam-Jin Lee,Sang-Soo Oh,Young-Cheol Kim Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2

<P>TmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> films which is one of the (Rare earth)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> high temperature superconductors with small ionic radius of rare earth element, were deposited on STO (100) single crystal substrates and Y<SUB>2</SUB>O<SUB>3</SUB>/YSZ/CeO<SUB>2</SUB> buffered metal substrates by pulsed laser deposition. The J<SUB>c</SUB> (77 K) and the value of onset of Tc TmBCO thin film on STO substrate was 4.5 MA/cm<SUP>2</SUP> and 86 K, respectively. The of J<SUB>c</SUB> TmBCO coated conductor on metal substrate was 1 MA/cm<SUP>2</SUP> . In-field property measurement was carried out at temperatures between 10 K and 77 K in magnetic filed up to 6 T in PPMS system. This is the first report, to the best of our knowledge, of TmBCO thin films and coated conductors with TmBCO film as the superconducting layer which have critical current densities at 77 K of 4.5 MA/ cm<SUP>2</SUP> and 1 MA/cm<SUP>2</SUP> , respectively. The superconducting properties of TmBCO films and the possibility of using TmBCO film as the superconducting layer of the HTS coated conductor, were investigated.</P>

일본잎갈나무 , 잣나무 , 신갈나무 임분 토양수 성질의 계절적 변이

오종민,진현오,손요환,주영특,정덕영,류성렬 한국환경농학회 2000 한국환경농학회지 Vol.19 No.1

토양수 내 이온 농도의 계절적 변이를 구명하기 위하여 경기도 광주군 퇴촌면에 위치한 26년생 일본잎갈나무, 잣나무, 신갈나무 임분의 O층, A층, B층에 zero tension lysimeter를 설치하고 1996년 9월부터 1999년 6월까지 토양수를 채취하여 분석하였다. 10월과 11월에 토양수 내 K^+, Mg^2+, Cl^-, NO_3^-등의 농도가 증가하였는데, 이는 가을철 낙엽 및 낙지의 유입에 의한 것으로 보이며, 3월과 4월에 Na^-, Ca^2+, K^+, Mg^2+ 등의 농도가 증가하는 것은 봄철에 빈번하게 발생하는 황사현상에 기인하는 것으로 사료된다. 또한 토양수 내 이온 가운데서 K^+의 농도가 연중 계절별로 가장 크게 변하는 것으로 나타났으며, 토양수 내 CI 농도는 K^+, Mg^2+ 농도와 양의 상관관계를 나타내었다. 단변량 시계열 분석 결과 연구기간 동안 토양수 pH는 지속적으로 감소하는 반면 Al^3+과 K^+농도는 증가하는 경향을 나타내었다. 이와 같은 경향이 지속될 경우 O층 토양수 내 Al^3+농도가 식물체에 피해를 줄 수 있는 최소농도 (0.018 meq/1)에 도달하려면 수종에 따라 차이는 있으나 10-20년이 소요될 것으로 추정되었다. To investigate seasonal variations of soil solution chemistry, samples were collected from zero tension lysimeters in O, A, and B horizons of 26-year-old Larix leptolepis. Pinus koraiensis and Quercus mongolica stands in Kwangju, Kyunggi Province from September, 1996 through June. 1999. Potassium, Mg^2+, Cl^-, and No_3^- concentrations increased in October and November concurrent with inputs of fresh litterfall and twigs. Sodium, Ca^2+, K^+, and Mg^2+ concentrations increased in March and April concurrent with the yellow sand effect. Potassium concentration showed the highest variation among ions, and Cl^- concentration showed positive correlations with K^+ and Mg^2+ concentrations. Soil solution pH decreased while Al^3+ and K^+ concentrations increased during the study period. If our data reflects long term trends. then Al^3+ concentration in the O horizon will reach the toxic level (0.180 meq/1) within 10-20 years depending on species

면접조사를 통한 초등학생의 영양교육 실태 및 실천도 조사

오유진,이영미,김정현,안홍석,김정원,박혜련,서정숙,김경원,권오란,박혜경,이은주,성현이 대한지역사회영양학회 2008 대한지역사회영양학회지 Vol.13 No.4

This study investigated the experience and practice of elementary school students on nutrition education. The data were collected from 217 male and female students attending 5-6th grade elementary schools in Seoul and Kyunggi-Do from March to June 2007, interviewing face to face by a nutrition teacher and 3 interns of a nutrition teacher. The results were as follows: 86.5% of the subjects learned about ‘Table etiquette’, ‘Reasons for eating fruits and vegetables’ (78.7%), ‘Food waste and environment’ (72.3%), ‘Healthy snacks’ (55.7%), ‘Food sanitation’ (52.3%), ‘Food culture of foreign countries’ (48.1%). Nutrition education experience was significantly different by gender. A total of 43.5% boys responded that they never learned about ‘basic food preperation’ (p < 0.01). They had learned ‘Nutrients for body’ and ‘Food waste and environment’ in school, ‘Healthy weight loss’, ‘Food culture of foreign countries’, ‘Food circulation’ on television, Most content (‘Table etiquette’, ‘Simple cooking’, ‘Food sanitati n’, ‘Eating behaviors for health’, ‘Reasons for eating fruits and vegetables’, ‘Healthy snacks’) was learned from parents. The practice after nutrition education was higher in ‘Table etiquette’ (2.14), ‘Eating fruits and vegetables’ (2.07) than others compared with education experience. The most reason of non-practice on nutrition information was ‘Troublesome’. In ‘Nutrients for body’, a boy answered ‘Difficult for practice’ 20.0%, a girl answered ‘Difficult to understand’ 32.6%, showing a significant difference between the gender groups (p < 0.001). They remembered the ‘Nutrients for body’ (49.6%), ‘Food sanitation’ (44.5%) because of ‘important content’,‘Basic food preparation’ (40.6%), ‘Food culture of foreign countries’ (36.3%) because of ‘interesting content’, ‘Healthy weight loss’ (52.0%), ‘Eating behavior for health’ (44.5%) and ‘Healthy snacks’ (33.7%) because of ‘need for my health’.

시상면 병행에 근거한 신개념의 하악상행지 시상분할 골절단술

백진아,이국엽,오향락,고승오,진우정 大韓顎顔面成形再建外科學會 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.6

Sagittal split osteotomy (SSRO) is an indispensable and most popular operation for correction of mandibular deformity. The procedure was considered of bony contact surface and nerve injury in the early stage. The procedure has undergone continuous surgical modifications for condylar displacement, relapse, psychologic analysis, functional & esthetic improvement, fixation method and postoperative evaluation of soft tissue change over time. In this article, we compared the contemporary operation method with new method which was designed through ramal computed tomography. Now we are going to introduce novel conceptual SSRO namely CNU-SSRO designed by Chonbuk National University and suggest the standardization of pre-existed SSRO.

내측 안와벽 골절의 처치

백진아,오향락,양명락,고승오 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.4

Orbital blowout fractures most often occur following blunt trauma to the periobital region. Medial orbital wall fracture first occur at the weakest point of the orbital wall, lamina papyracea of the ethmoid. Medial orbital wall fractures are isolated or combined type with nasal bone, orbital floor, zygoma, ethmoid and frontal bones. Clinical features of the medial orbital wall fractures include periobital edema and ecchymosis, subcutaneous emphysema, epistaxis, limitation of ocular motion, diplopia, and enophthalmos. Goals of treatment in medial orbital wall fracture are reduction of herniated orbital soft tissues and complete reconstruction of orbital wall. We have experienced patients with isolated medial orbital wall fracture and reconstructed medial orbital walls with Medpor and obtained good results.

경주지역 여고생의 초경과 체성장간의 관계

김준섭,권오구,박진석,오종수,박정현,박제식,안세한,이용환,서정호,신태섭,최영배,김덕수,이관,박수경 東國大學校醫學硏究所 2002 東國醫學 Vol.9 No.1

본 연구는 경주지역 1개 고등학교 3학년 여고생을 대상으로 초경 시작 전인 초등학교 4학년부터 고등학교 2학년까지의 키, 몸무게, 가슴둘레 수치와 초경 연령을 파악하여 여성의 초경이 빠를수록 체성장 속도의 변화가 있을 것이라는 가설을 기초로 두 요인간의 관련성을 파악하고자 시행되었다. 경주시 1개 여자고등학교 3학년생 총 317명에 대해 ㅊ경 나이, 초경시 심리 상태, 초경이 시작되었을 때의 상담 여부와 상담하였던 사람, 부모 신장과 초경전후의 식사 규칙성, 다이어트 경험, 수면시간, 스트레스, 음주/흡연 여부, 질병력 등에 대한 설문 조사를 시행하였고, 초등학교 4학년부터 고등학교 2학년까지의 키, 몸무게, 가슴둘레에 대한 정보는 건강기록부에서 확보하였다. 상기 대상자 중 건강기록부가 분실된 39명, 초경나이에 대해 응답하지 않았던 29명 및 결석 등으로 조사를 하지 못하였던 42명을 제외한 조사 대상자는 206명으로 선정하였다. 대상자들의 초경연령 평균값(Mean±SD)은 13.0±1.11이었고, 초등학교 4학년부터 고등학교 2학년까지의 초경 이후 신장 성장률은 감소하였으며, 초경연령이 빠른 군이 초등학교 때는 신장에 있어서 우위를 차지하나 고등학교에 오면서 신장은 비슷한 수준이 되었다. 초경후 1-2년 사이에 체중과 흉위의 증가율은 감소하였고, 초경연령이 빠른 군이 초등학교와 고등학교 사이에 체중과 흉위에서 모두 우위를 차지하였다. 본 연구의 결과는, 흔히 이차 성징의 시작 시점 혹은 사춘기의 시작 시점으로 보고있는 초경 연령이 청소년기의 성장과 밀접한 관련성이 있고, 특히 체중과 흉위의 성장 속도와 밀접한 관련성이 있음을 시사한다. To understand the onset of menarche in relation to changes in physical growth that take place during female adolescence, especially the changes in height and weight velocity. The 207 senior in one women high school of Kyongju were investigated in April 3 to 8, 2001. We collected the information, relation in the age at menarche, height & weight of parents, regularity of eating, and obesity diet, duration of sleeping, sickness & stress near age at menarche, by self-recording. The status of height, weight & chest circumference between the 4th grade of primary school and the junior of high school was collected by individual Health Record. The results were followed; The average age at menarche was 12.95±1.11 years old and the most frequent age of menarche is 13 years. After menarche, the velocity of height, weight and chest circumference were decreased. The most rapid group of menarche hold dominant position in height during elementary school. As time passed, they dont hold dominant position in height. The most rapid group of menarche get an advantage in the weight and the girth of chest after elementary school. The height of subjects is directly proportional to the height of their parents. These results suggest that the starting age at menestuation can be closely associated with physical growth and development.

韓國人의 各 臟器組織中 靑酸鹽의 微量分布에 關한 硏究(Ⅱ)

張成吉,金恩浩,金英雲,李鎭勳,柳在薰,權五星,金明德,吳世珍,金由那 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

生體血의 保存環境과 腐敗産物에 依한 血中알콜濃度變化에 關한 硏究

張成吉,金英雲,柳在薰,吳世珍,權五星,朴世延 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

PLD법을 이용한 TmBa₂Cu₃O<SUB>7-x</SUB> 초전도 선재 제작 및 전류전송특성 평가

권오정(O-Jong Kwon),고락길(Rock-Kil Ko),구현(Hyun Koo),배성환(Sung-Hwan Bae),정명진(Myung-Jin Jung),오상수(Sang-Soo Oh),박찬(Chan Park) 대한전기학회 2009 전기학회논문지 Vol.58 No.11

REBa₂Cu₃O7-d(REBCO) coated conductors(REBCO CCs) have been studied for electric power applications which require high current density wires. As long as the critical transition temperature(Tc) is concerned, REBCO CCs with large RE³? ions have been expected to have better current transport properties than those with smaller RE³? ions. For this reason, REBCO's with large RE³? ions which include GdBCO, NdBCO and SmBCO have been mainly considered as the superconducting layer of CCs. On the other hand, REBCO's with smaller RE³? ions are expected to have advantages in the fabrication process of CCs because of the lower melting temperature. But it has not yet been made clear which REBCO is the most suitable for the superconducting layer of CCs. In this study, we investigated the current transport properties of REBCO CCs with small RE³? ion and advantages of using that in the CC fabrication process. Thin films of TmBCO, which has smaller RE³? ion than most other RE³? ions, were fabricated on buffered metal substrate as the superconducting layer of CC by PLD process. TmBCO CC shows critical current density (Jc (77 K, sf) = 2.3 MA/㎠) high enough to be utilized for application in electric power devices. Compared with previous experiments using the same PLD system, deposition temperature was approximately 20 ℃ lower than NdBCO thin films on buffered metal substrates.

Chemically exfoliated transition metal dichalcogenide nanosheet-based wearable thermoelectric generators

Oh, Jin Young,Lee, Ji Hoon,Han, Sun Woong,Chae, Soo Sang,Bae, Eun Jin,Kang, Young Hun,Choi, Won Jin,Cho, Song Yun,Lee, Jeong-O,Baik, Hong Koo,Lee, Tae Il The Royal Society of Chemistry 2016 ENERGY AND ENVIRONMENTAL SCIENCE Vol.9 No.5

<P>To utilize human heat energy as a permanent power source, we demonstrate, for the first time, an intrinsically highly foldable and stretchable thermoelectric generator that is based upon chemically exfoliated 1T-transition metal dichalcogenide (TMDC) nanosheets (NSs) for self-powered wearable electronics. The power factors of WS2 (n-type) and NbSe2 (p-type) NS films were evaluated to be 5-7 mu K-2 m(-1) and 26-34 mu W K-2 m(-1), respectively, near room temperature. With these films, parallel-connected thermoelectric generators that were fabricated were able to constantly produce up to 38 nW of output power at D60 K. The thermoelectric device stably sustained its performance, even after 100 bending cycles and after 100 stretching cycles (50% strain). By direct observation, we found that the film is highly stretched by partial tearing and folding but still maintains an electrical percolation pathway. The morphology then is quickly recovered by a plug-in contact between the torn parts as the external strain is released. Finally, we demonstrate the electric power generation from a prototype wearable thermoelectric generator that was woven into a wristband fitted on a real human body.</P>