• 한국결정성장학회지
• /
• 제7권3호
• /
• pp.487-493
• /
• 1997

SiC(4H) 결정에 Ti을 열증착하여 Ti/SiC(4H) 쇼트키(Schottky) 장벽 다이오드를 만들었다. SiC(4H)의 주개농도(donor concentration)는 전기용량-전압(C-V) 측정으로부터 $2.0{\times}10^{15}{\textrm}{cm}^{-3}$이었으며, 내부전위(built-in potential)는 0.65 V이었다. 전류-전압(I-V) 특성으로 부터 다이오드의 이상계수(ideally factor)는 1.07이었으며, 역방향 항복전장(breakdown field)은 약 $1.7{\times}10^3V/{\textrm}{cm}$이었다. 상온에서 $140^{\circ}C$까지 온도변화에 따라 측정된 포화전류로 부터 구한 전위장벽(potential barrier)은 0.91 V이었는데, 이는 C-V 특성으로 부터 구한 전위장벽과 거의 같았다.

• 대한간호학회지
• /
• 제30권5호
• /
• pp.1347-1356
• /
• 2000

The present study is a descriptive study to investigate nurses’perception of barriers to research utilization. A total of 274 participants in this study consisted of registered nurses working in a large, urban and academic medical center. A questionnaire packet containing the Barriers Scale, and a demographic profile was distributed to nurses and they were asked to return the packet to a return-box in the Nursing Office after completion. The greatest barrier was insufficient time on the job to implement new ideas. Next was ‘implications for practice are not made clear'. Also the item of the English language in research articles was considered to be the ninth barrier. The greatest mean score of each of the sub-scales was the communication factor. The were followed by the organization, research, and nurse factors. Compared with the means from other studies, the mean scores of the communication and research factors were higher in this study. Nurses who had not taken a class of research methods found the communication and research factors as a higher barrier than those who did. Also, nurses who did not participate in a conference last year perceived the research factor as higher than those who did. It is recommended that English and research classes should be strengthened in educational nursing programs. The researchers should also describe the section of implication for practice as more detail and clearer for the understanding of nurses; Lastly journals in a libraries or online journal systems should be easily accessible.

• 한국가구학회지
• /
• 제22권1호
• /
• pp.13-17
• /
• 2011

Recently, interest in indoor air quality is increasing. Especially, radon radioactivity among the indoor air is a well-known risk factor for lung cancer because of ionizing radiation in the form of ${\alpha}$-particles. This study was carried out to investigate effect of black charcoal and activated carbon for reduction of radon radiation that emitted from building materials. Black charcoal and activated carbon were used as a barrier which was against the infiltration of radon. The source of radon was gypsum board. Two types of charcoal barrier were powder- and board-type with 5 mm, 10 mm thickness respectively. The method for this determination is evaluated radon concentration in chamber. The measurements were performed with radon detector, SARAD3120. Results of this study are as following: Black charcoal and activated carbon confirmed the highly efficient barrier. Radon concentration was reduced from 72% to 85% as compared the control chamber. Radon reduction capability, however, was no difference as barrier's types. Results obtained in ventilation condition, radon concentration shows 5.93 pCi/L on average in the closed condition and shows 2.69 pCi/L in the opened condition.

• 한국의류학회지
• /
• 제32권9호
• /
• pp.1450-1460
• /
• 2008

The goal of this study was to investigate the impacts of service quality, customer satisfaction, and switching burier on store loyalty of the clothes shops at large-scale discount stores. The subjects were 357 female adults living in Suncheon City, Jeollanam Province. The questionnaires were conveniently sampled from June 1 to 30, 2006. The collected data were factor and reliability analyzed using the SPSS program. And Regression was used to verify the relationships between the variables. Among the six hypotheses set in the research model, total three were accepted through empirical analysis and the rest three were accepted partially. The empirical results showed the following managerial implications. First, consumer' perceived service quality has relationship with customer satisfaction and store loyalty. Second, service quality has a positive relationship with switch barrier. Third, customer satisfaction has significantly related with switch barrier. Fourth, switch barrier has positively related with store loyalty. Finally, 'sales people', 'VMD/atmosphere', and 'assortment' of the service quality factors have positive relationships with store loyalty, but 'policy' has a negative relationship with store loyalty.

• Journal of information and communication convergence engineering
• /
• 제17권2호
• /
• pp.161-165
• /
• 2019

In this study, zinc tin oxide (ZTO) thin-film transistors are researched to observe the correlation between the barrier potential and electrical properties. Although much research has been conducted on the electronic radiation from Schottky contacts in semiconductor devices, research on electronic radiation that occurs at voltages above the threshold voltage is lacking. Furthermore, the current phenomena occurring below the threshold voltage need to be studied. Bidirectional transistors exhibit current flows below the threshold voltage, and studying the characteristics of these currents can help understand the problems associated with leakage current. A factor that affects the stability of bidirectional transistors is the potential barrier to the Schottky contact. It has been confirmed that Schottky contacts increase the efficiency of the element in semiconductor devices, by cutting off the leakage current, and that the recombination at the PN junction is closely related to the Schottky contacts. The bidirectional characteristics of the transistors are controlled by the space-charge limiting currents generated by the barrier potentials of the SiOC insulated film. Space-charge limiting currents caused by the tunneling phenomenon or quantum effect are new conduction mechanisms in semiconductors, and are different from the leakage current.

• 대한약학회:학술대회논문집
• /
• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
• /
• pp.200.1-200.1
• /
• 2003

The purpose of this study is to examine whether an brain to blood efflux system for taurine is present on the blood-brain barrier (BBB) or not and this efflux transport system is regulated by CNS cell damage with oxidative stress agent such as diethyl maleate (DEM) or tumor necrosis factor-a (TNF-${\alpha}$), by using the brain efflux index (BEI) method. The brain efflux index value is defined as the relative amount of test compound efflux from cerebrum compared with that of a reference compound, [$\^$14/C] carboxyinulin, which has limited BBB permeability. (omitted)

• 통상정보연구
• /
• 제13권4호
• /
• pp.23-49
• /
• 2011

본 연구는 고객관계관리의 중요성과 비중이 높아짐에 따라 B2B e-마켓플레이스에서의 e-CRM요인이 고객관계의 질과 성과에 미치는 영향관계를 파악하고 이러한 영향관계에서 전환장벽이 조절효과를 가지는지를 기업 대상 설문조사 자료를 토대로 실증분석 하였다. 분석결과를 살펴보면 첫째, e-CRM 요인 (e-Marketing, e-Service, e-Sales)은 B2B e-마켓플레이스 이용 고객들(공급자/구매자)과의 관계의 질(만족, 신뢰)과 성과(재구매 의도, 장기지향성)에 유의한 정(+)의 영향을 미쳤다. 둘째, 고객관계의 질과 성과 간의 분석에서는 관계의 질이 높을수록 성과도 높아지는 긍정적 관계를 나타냈다. 셋째, 고객관계의 질과 성과간의 관계에서 전환장벽(대안 매력도, 전환비용)의 조절효과 분석에서는 대안매력도와 전환비용은 모두 정(+)의 조절효과를 보였다.

• 한국정보통신학회논문지
• /
• 제16권9호
• /
• pp.2015-2020
• /
• 2012

본 연구에서는 이중게이트(Double Gate; DG) MOSFET에 스켈링이론을 적용할 때 두 개의 게이트에 의한 효과를 반영하기 위하여 스켈링인자에 가중치를 적용하여 문턱전압이하 특성을 해석하였다. 포아송방정식에 의한 전위분포를 구하기 위하여 전하분포는 가우스분포함수를 이용할 것이며 이의 타당성은 이미 여러 논문에서 입증하였다. 이 전위분포를 이용하여 단채널효과 중 문턱전압이동, 문턱전압이하 스윙, 드레인유도장벽감소 등을 스켈링인자에 대한 가중치의 변화에 따라 관찰하였다. 이중게이트 MOSFET의 구조적 특성상 채널길이에 대한 가중치는 0.1에서 1까지 사용하였으며 채널두께에 대한 가중치는 1에서 2까지 가중치를 사용하였다. 결과적으로 문턱전압 이하 스윙은 스켈링인자에 따라 거의 변화가 없었으나 가중치에 따라 변화하였으며 문턱전압이동 및 드레인유도 장벽감소 등은 스켈링인자에 따라 그리고 가중치에 따라 큰 변화를 보이는 것을 알 수 있었다.

• 대한교통학회지
• /
• 제26권5호
• /
• pp.205-216
• /
• 2008

향후 장애인과 고령인구의 지속적인 증가로 인해 교통약자의 통행수요는 확대될 것이며, 이에 따라 고령자, 장애자들이 안전하고 쾌적하게 생활할 수 있도록 지원하는 사회간접자본의 정비가 요구되고 있다. 무엇보다도 대중교통관련 시설의 Barrier-free화(무장애화)는 시급한 사안이라 보아진다. 본 연구의 목적은 공공재의 가치추정에 있어 효율적인 방법론인 이중양분선택형 질문법에 의한 CVM(조건부가치측정법)을 이용하여 지하철 역사의 Barrier-free 시설의 가치를 추정하고, 생존분석을 통해 지하철 이용자들의 지불의사금액에 영향을 미치는 요인을 분석하고자 한다. 본 연구의 결과, 에스컬레이터와 엘리베이터에 대한 평균지불의사금액이 장애인개찰기나 단차해소시설의 평균지불의사금액에 비해 상대적으로 높게 나와 실제 Barrier-free 시설의 확충에 있어서 이용편의시설보다는 이동편의시설을 먼저 시급히 설치해 나가야 함을 시사하고 있다. 또한 각 Barrier-free 시설에 대한 교통약자의 평균지불의사금액이 일반인의 평균지불의사금액에 비해 훨씬 높아 일반인과 비교할 때 교통약자들이 Barrier-free 시설의 가치를 상대적으로 높게 평가하고 있었다.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1998년도 춘계학술대회 논문집
• /
• pp.87-91
• /
• 1998

In this paper, We analyzed the current-voltage characteristics with n-type silicon substrates concentration and temperature variations (Room temperature, 50$^{\circ}C$, 75$^{\circ}C$) in platinum silicide and silicon junction. The electrical parameters of measurement are turn-on voltage, saturation current, ideality factor, barrier height, dynamic resistance in forward bias and reverse breakdown voltage according to variations of junction concentration of substrates and measurement temperature variations. As a result, the forward turn-on voltage, reverse breakdown voltage, barrier height and dynamic resistance were decreased but saturation currents and ideality factor were increased by substrates increased concentration variations in platinum silicide and n-silicon junction. In increased measurement temperature (RT, 50$^{\circ}C$, 75$^{\circ}C$), the extracted electrical parameter values of characteristics were rises by increased temperature variations according to the forward and reverse bias.