• 한국표면공학회지
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• 제37권2호
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• pp.71-75
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• 2004

The technology of $C_{60}$ fullerite films preparation by means of gas-phase deposition and structure of fullerite films are described. A three-channel flow plant was used to obtain fullerite films. The films were deposited in the flow of inert gas under reduced pressure onto a cooled silicon or sapphire substrate placed inside the reaction chamber of the plant. The plant allows one to obtain the films of pure fullerenes and to synthesise the films from fullerene compounds and doped fullerenes. The structure of two types of films were investigated by FE-SEM and SEM techniques: pure fullerite films onto silicon and sapphire substrates as well as compound films were studied by FE-SEM technique. All samples have shown columnar structure with high level of porosity. The synthesis of films composed of fullerene and its compounds for use in electronics is demonstrated to be promising. For example, experiments confirm the possibility to use fullerite films in sensor electronics to produce humidity and thermal sensors. It is also possible to use the sensitivity of these films to isotropic pressure. The experiments with $C_{60}$-Cu-J films have shown quite strong dependence of their resistance on pressure of different sort of medium-gas that could be used in gas-sensitive sensors. The structure and preparation technology of resistive sensor based on fullerite films are described.bed.

• 한국과학교육학회지
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• 제24권2호
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• pp.287-297
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• 2004

본 연구에서는 화학 개념을 설명하기 위해 과학 교과서에 사용된 비유에 대한 학생들의 이해도를 조사하고, 비유의 제한점으로 인해 유발될 수 있는 오개념을 분석한 후, 개념 이해도에 영향을 미치는 요인에 대해 살펴보았다. 물질의 세 가지 상태, 부피와 압력 사이의 관계, 분자 운동, 상태 변화와 에너지에 대한 비유와 개념 이해 검사, 장독립성 검사, 논리적 사고력 검사를 실시하였다. 분석 결과 절반의 학생들이 교과서의 의도와 다르게 비유를 이해하고 있었으며, 개념 이해도는 그 개념을 설명하는 비유에 대한 이해도 뿐 아니라, 장독립성, 논리적 사고력, 사전 과학 성취도와 유의미한 정적 상관이 있었다. 개념 이해도에 미치는 각 변인의 직 간접적인 효과를 분석한 결과, 사전 과학 성취도의 직접적 영향이 유의미하였으며, 장독립성과 논리적 사고력은 사전 과학 성취도와 비유 이해를 통해 간접적으로 영향을 미칠 수 있는 것으로 나타났다. 이를 바탕으로 과학교육에서 비유 사용의 제한점과 그 함의에 대하여 논의하였다.

• 재활간호학회지
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• 제14권1호
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• pp.5-12
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• 2011

Purpose: The purpose of this study was to evaluate the association among of Activity of Daily Living (ADL), Instrumental Activities of Daily Living (IADL), depression and isolation in disabled people. Method: The subjects consisted of 761 disabled people in Korea. Data were analyzed using descriptive statistics, t-test, ANOVA, and Pearson's correlational statistics. Results: There were significant differences in age, cause of disability, type of disability, degree of disability, education, job, perceived health condition, and economic status between disabled people with high and low levels of ADL and IADL. Depression showed significant differences in type of disability, degree of disability, education, job, perceived health condition, and economic state; isolation showed significant differences in age, cause of disability, type of disability, education, job, residence, perceived health condition, and economic status. A significant association was identified between depression and isolation (r=.69, p<.001). Conclusion: There was a high incidence of depression in disabled men with high levels of isolation and ADL and IADL dependence. An effort to increase disabled people's ADL, IADL, and independence levels is needed, and nursing interventions should be designed and tested to increase their community involvement and decrease the sense of isolation and depression.

• 한국진공학회지
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• 제2권4호
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• pp.439-454
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• 1993

The phase sequence of codeposited Co-Si alloy and Co/si multilayer thin film was investigated by differential scanning calormetry(DSC) and X-ray diffraction (XRD) analysis, The phase sequence in codeposition and codeposited amorphous Co-Si alloy thin film were CoSilongrightarrow Co2Si and those in Co/Si multilayer thin film were CoSilongrightarrowCo2Silongrightarrow and CoSilongrightarrowCo2Si longrightarrowCoSilongrightarrowCoSi2 with the atomic concentration ration of Co to Si layer being 2:1 and 1:2 respectively. The observed phase sequence was analyzed by the effectvie heat of formatin . The phase determining factor (PDF) considering structural facotr in addition to the effectvie heat of formation was used to explain the difference in the first crystalline phase between codeposition, codeposited amorphous Co-Si alloy thin film and Co/Si multilayer thin film. The crystallinity of Co-silicide deposited by multitarget bias cosputter deposition (MBCD) wasinvestigated as a funcion of deposition temperature and substrate bias voltage by transmission electron microscopy (TEM) and epitaxial CoSi2 layer was grown at $200^{\circ}C$ . Parameters, Ear, $\alpha$(As), were calculate dto quantitatively explain the low temperature epitaxial grpwth of CoSi2 layer. The phase sequence and crystallinity had a stronger dependence on the substrate bias voltage than on the deposition temperature due to the collisional daxcade mixing, in-situ cleannin g, and increase in the number of nucleation sites by ion bombardment of growing surface.

• 지역사회간호학회지
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• 제18권2호
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• pp.252-265
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• 2007

Purpose: This study was attempted to provide basic data required to develop community-base rehabilitation program for disabled persons at home by investigating their characteristics. ADL, and perceived health status. Method: The subjects were 146 disabled persons at home in rural areas. Data were collected from January 22 to January 31, 2004. Data were analyzed using frequencies, percentages, means, standard deviations, minimums, maximums, $\chi^2$-test, Fisher's exact test, t-test, one-way ANOVA, Scheffe test, Contingency coefficient, Pearson's correlation, Stepwise multiple regression. Results: The average score of ADL was $5.51{\pm}1.92$: sphincter control $(5.85{\pm}2.10)$, communication $(5.66{\pm}2.02)$, transfers $(5.67{\pm}2.21)$, self care $(5.44{\pm}2.05)$, social cognition $(5.33{\pm}2.08)$, and locomotion $(4.85{\pm}2.32)$. This means that the respondents were in the state of dependence. The main items requiring others' help were 'bathing' (57.7%) and 'going up and down stairs' (51.1%) ADL was significantly different according to age, sender, occupation, medical fee payer, type, severity and duration of disability, BMI, and alcohol drinking. Among the respondents, 82.8% perceived that their health status was bad. Main factors influencing the perceived health status of disability were age and ADL$(R^2=.343)$. Conclusion: Perception of health status among the disabled is related to their characteristics and ADL, so it is necessary to develop community-base rehabilitation programs in order to improve ADL and the perception of health status.

• 정보처리학회논문지D
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• 제10D권4호
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• pp.655-660
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• 2003

현재 이동 컴퓨팅 환경에서 이동 호스트가 사용하는 캐쉬는 전력의 한계와 제한된 대역폭이라는 단점을 보완할 수 있는 중요한 장치로서 사용된다. 하지만 서버 데이터와의 일관성을 유지해야 하는 부담을 가지고 있다. 본 논문에서는 선택적 캐쉬 일관성 유지 기법을 제안한다. 서버는 캐쉬 상태 테이블, 데이터 접근 테이블을 유지하여 이동 호스트에서 미래 사용성이 높은 데이터에 대한 선별을 통해 효율적인 방송을 가능하게 한다. 또한 오랜 접속 단절 이후에 연결된 이동 호스트의 요청에 따라 서버가 보관하고 있던 지난 방송 정보를 전달하고 비동기적인 방송을 수행함으로써 다수의 캐쉬 데이터가 버려지는 것을 방지하고, 최신의 데이터를 보유할 수 있도록 한다. 따라서 이동 호스트는 서버에 대한 의존도를 줄일 수 있게 되어 자치성 증대라는 효과를 얻을 수 있음이 실험을 통해서 보여진다.

• Clinical and Experimental Pediatrics
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• 제57권11호
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• pp.496-499
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• 2014

Wernicke's encephalopathy is an acute neurological disorder characterized by mental confusion, oculomotor dysfunction, and ataxia. It has been reported in individuals with alcohol dependence, hyperemesis gravidarum, and prolonged parenteral nutrition without vitamin supplementation. Here we present the case of a 13-year-old male patient with neuroblastoma and a history of poor oral intake and nausea for 3 months. After admission, he showed gait disturbances, nystagmus, and excessive dizziness; his mental state, however, indicated he was alert, which did not fit the classical triad of Wernicke's encephalopathy. A diagnosis of Wernicke's encephalopathy was made only after brain magnetic resonance imaging and serum thiamine level analyses were performed. The patient's symptoms remained after 5 days of treatment with 100-mg thiamine once daily; thus, we increased the dosage to 500 mg 3 times daily, 1,500 mg per day. His symptoms then improved after 20 days of replacement therapy. This case report describes a pediatric patient who was promptly diagnosed with Wernicke's encephalopathy, despite only 2 suspicious symptoms, and who completely recovered after high doses of thiamine were given intravenously.

• 한국도서관정보학회지
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• 제45권4호
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• pp.139-164
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• 2014

이 연구는 학교도서관 관련 연구학교 보고서를 분석하여 학교도서관 활용교육의 특징과 문제점을 식별하고 개선방안을 논의하는 것을 목적으로 하였다. 에듀넷의 연구학교 사이트에 탑재된 중 고등학교 보고서 23편을 내용분석하여 각 학교가 수행한 도서관활용교육의 실천내용을 13가지로 분류하였다. 가장 많이 실시한 활동은 장서확충, 독서행사, 도서관활용수업(LAI), DLS 활용이었으며, 학습동기 유발에서부터 자기주도적 학습능력 증진에 이르기까지 교육목표로 추구하는 다양한 효과를 창출하였다. 그러나 도서관활용수업이 DLS를 사용한 독서활동에 지나치게 의존하고 있으며, 시간과 자료의 부족으로 정보탐색활동은 거의 이루어지지 않고 있다는 문제점이 있다. 도서관활용수업이 추구하는 자기주도적 학습능력을 함양하기 위해서는 도서관의 정보활동을 통하여 어떤 교육경험을 어떤 방법으로 제공할 것인가에 대해 교육과정과 연계하여 더 치밀하게 계획할 필요가 있다.

• Advances in Energy Research
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• 제5권2호
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• pp.91-105
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• 2017

Thermal hydraulic (TH) analysis of nuclear power reactors is utmost important. In this way, the numerical codes that preparing TH data in reactor core are essential. In this paper, a subchannel analysis of a Russian pressurized water reactor (WWER1000) core with enhanced numerical code is carried out. For this, in fluid domain, the mass, axial and lateral momentum and energy conservation equations for desired control volume are solved, numerically. In the solid domain, the cylindrical heat transfer equation for calculation of radial temperature profile in fuel, gap and clad with finite difference and finite element solvers are considered. The dependence of material properties to fuel burnup with Calza-Bini fuel-gap model is implemented. This model is coupled with Isotope Generation and Depletion Code (ORIGEN2.1). The possibility of central hole consideration in fuel pellet is another advantage of this work. In addition, subchannel to subchannel and subchannel to rod connection data in hexagonal fuel assembly geometry could be prepared, automatically. For a demonstration of code capability, the steady state TH analysis of a the WWER1000 core is compromised with Thermal-hydraulic analysis code (COBRA-EN). By thermal hydraulic parameters averaging Fuel Assembly-to-Fuel Assembly method, the one sixth (symmetry) of the Boushehr Nuclear Power Plant (BNPP) core with regular subchannels are modeled. Comparison between the results of the work and COBRA-EN demonstrates some advantages of the presented code. Using the code the thermal modeling of the fuel rods with considering the fission gas generation would be possible. In addition, this code is compatible with neutronic codes for coupling. This method is faster and more accurate for symmetrical simulation of the core with acceptable results.

• 한국자기공명학회논문지
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• 제3권2호
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• pp.100-108
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• 1999

Cop protein is the transcription repressor protein in rolling circle replication plasmid. With antisense RNA, Cop protein controls the copy number of plasmid. Cop family proteins have been found in various plasmids. Among Cop family proteins, Cop studied in this paper consists of 55 amino acids (Mw. 6,400), and was known to have trimer structure. Since no structural facts are elucidated, we have carried out preliminary experiments aimed at the elucidation of its three dimensional structure. The secondary structure of Cop is studied by CD and NMR. To solve the aggregation of Cop at high concentration, we tested various detergents and salts. The addition of detergents and salts could not solve the aggregation problem. However, we found that concentration is important in solving the aggregation problem. We knew that 0.18mM in 50mM potassium phosphate without any other ingredients is maximum concentration not to aggregate. Wa also investigated the pH dependence of Cop protein, and knew that Cop protein is more stable in acid state. At various temperatures, 15N-1H HSQC spectra were measured in order to find the optimal experimental condition. To enhance the peak resolution, 3D NOESY-HSQC spectrum is acquired. Since there are NOE peaks in the NH-NH region, we knew that Cop protein has $\alpha$-helical content, which was also confirmed by CD.