• Journal of information and communication convergence engineering
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• 제16권4호
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• pp.248-251
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• 2018

To research the characteristics of $TiO_2$ as an insulator, $TiO_2$ films were prepared with various annealing temperatures. It was researched the currents of $TiO_2$ films with Schottky barriers in accordance with the contact's properties. The potential barrier depends on the Schottky barrier and the current decreases with increasing the potential barrier of $TiO_2$ thin film. The current of $TiO_2$ film annealed at $110^{\circ}C$ was the lowest and the carrier density was decreased and the resistivity was increased with increasing the hall mobility. The Schottky contact is an important factor to become semiconductor device, the potential barrier is proportional to the hall mobility, and the hall mobility increased with increasing the potential barrier and became more insulator properties. The reason of having the high mobility in the thin films in spite of the lowest carrier concentration is that the conduction mechanism in the thin films is due to the band-to-band tunneling phenomenon of electrons.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제17권3호
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• pp.43-51
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• 2011

The mobility and accessibility enhancement is gradually becoming a global interest due to the growth in the aging population and concerns about people with disabilities. The main purpose of this study is to know the current situation in barrier-free level in railroad facilities in order to allow the mobility handicapped to travel in a safe and convenient manner. The research has started with investigating current situation for the mobility handicapped people and explores the needs of barrier-free facilities. 84 domestic railroad facilities were evaluated based on assessment tool developed from the mobility handicapped act. As a result, the fact that the mobility handicapped experienced limited accessibility due to various types of obstacles in the facilities was discovered. Based on the evaluation, obstacles in the facilities were analyzed and categorized by specific dimensions, users' accessibility, mobility, usability, and clarity (way-finding). This study suggests barrier-free design for passenger facilities focused on train station. Because mobility and accessibility are emphasized in current society, improvement of the mobility handicapped' movement should be considered. Barrier-free design for passenger facilities should be realized throughout comprehending the reasons why these obstacles occur in the facilities not using installation convenience facilities. This study has meaning in finding out the obstacles in each cause of occurrence(accessibility, mobility, usability, and clarity (way-finding)).

• 한국항해항만학회지
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• 제36권9호
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• pp.763-767
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• 2012

The ratio of the mobility handicapped person is about 25.8% of the total population in Korea(MCT, 2006). In order to prepare for the enforcement of the "Transportation Services Improvement Act for the Mobility Handicapped People"(MCT, 2006), various equipments and installations should be developed to ensure appropriate safety level for the mobility handicapped persons in maritime transportation. While approximately 10 million people are using domestic passenger vessels annually, preferences for maritime transport is very low, especially for the mobility handicapped. This study reviewed a current status of the mobility handicapped person in domestic passenger ship and analysed the improvement plan for them. To investigate the current status of domestic passenger vessel usage by the mobility handicapped, to analysis the requirements for amenities necessary for the mobility handicapped and select the ones to be developed based on the investigated results and to do feasibility study of barrier-free ship.

• Transactions on Electrical and Electronic Materials
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• 제18권6호
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• pp.323-329
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• 2017

This reports the electrical behavior, bonding structure and Schottky contact of gallium-zinc-oxide (GZO) thin film annealed at $100{\sim}400^{\circ}C$. The mobility of GZO with high density of PL spectra and crystal structure was also increased because of the structural matching between GZO and Si substrate of a crystal structure. However, the GZO annealed at $200^{\circ}C$ with an amorphous structure had the highest mobility as a result of a band to band tunneling effect. The mobility of GZO treated at low annealing temperatures under $200^{\circ}C$ increased at the GZO with an amorphous structure, but that at high temperatures over $200^{\circ}C$ also increased when it was the GZO of a crystal structure. The mobility of GZO with a Schottky barrier (SB) was mostly increased because of the effect of surface currents as well as the additional internal potential difference.

• Journal of Periodontal and Implant Science
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• 제29권1호
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• pp.193-207
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• 1999

The purpose of this study was to compare the clinical results of guided tissue regeneration(GTR) using a resorbable barrier manufactured from an copolymer of polylactic acid (PLA) and polylaetic-glycolic acid(PLGA) with those of nonresorbable ePTFE barrier. Thirty two patients(25 to 59 years old) with one radiographically evident intrabony lesion of probing depth ${\geq}$6mm participated in a 6-month controlled clinical trial. The subjects were randomly divided into three independent groups. The first group(n=8) received a ePTFE barrier. The second group (n=12) received a resorbable PLA/PLGA barrier. The third group (n=12) received a resorbable PLA/PLGA barrier combined with an alloplastic bone graft. Plaque index (PI), gingival index(GI), probing depth(PD), gingival recession, clinical attachment level(CAL), and tooth mobility were recorded prior to surgery and at 3, 6 months postsurgery, Statistical tests used to analyze these data included independent t-test, paired t-test, one-way ANOVA. The results were as follows : 1. Probing depth was significantly reduced in all groups at 3, 6 months postsurgery and there were not significant differences between groups. 2. Clinical attachment level was significantly increased in all groups at 3, 6 months postsurgery and there were not significant differences between groups. 3. There were not significant differences in probing depth, clinical attachment level, gingival recession, tooth mobility between second group (PLA/PLGA barrier) and third group (PLA/PLGA barrier combined with alloplastic bone graft) 4. Tooth mobility was not significantly increased in all groups at 3, 6 months postsurgery and there were not significant differences between groups. In conclusion, PLA/PLGA resorbable barrier has similar clinical potential to eP'IFE barrier in GTR procedure of intrabony pockets under the present protocol.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.377-377
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• 2014

We demonstrate the high temperature-dependent electrical behavior at 2D multilayer MoS2 transistor. Our previous reports explain that the extracted field-effect mobility of good device was inversely proportional to the increase of temperature. Because scattering mechanism is dominated by phonon scattering at a well-designed MoS2 transistor, having, low Schottky barrier. However, mobility at an immature our $MoS_2$ transistor (${\mu}m$ < $10cm^2V^{-1}s^{-1}$) is proportional to the increase temperature. The existence of a big Schottky barrier at $MoS_2-Ti$ junction can reduce carrier transport and lead to lower transistor conductance. At high temperature (380K), the field-effect mobility of multilayer $MoS_2$ transistor increases from 8.93 to $16.9cm^2V^{-1}sec^{-1}$, which is 2 times higher than the value at room temperature. These results demonstrate that carrier transport at an immature $MoS_2$ with a high Schottky barrier is mainly affected by thermionic emission over the energy barrier at high temperature.

• Journal of Information Display
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• 제10권4호
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• pp.143-148
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• 2009

The theoretical current density equations for organic semiconductors was derived according to the internal carrier emission equation based on the diffusion model at the Schottky barrier contact and the mobility equation based on the field dependence model, the so-called "Poole-Frenkel mobility model." The electric field becomes constant because of the absence of a space charge effect in the case of a higher injection barrier height and a lower sample thickness, but there is distribution in the electric field because of the space charge effect in the case of a lower injection barrier height and a higher sample thickness. The transition between the injection- and bulk-limited currents was presented according to the Schottky barrier height and the sample thickness change.

• 대한교통학회지
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• 제26권5호
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• pp.205-216
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• 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.

• 한국측량학회지
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• 제34권3호
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• pp.273-282
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• 2016

최근 교통약자의 이동권에 대한 관심이 증가하고 있으나 대부분 제도적 시설 공급측면에 치중되어 일시적 이동상의 불편함만을 해소할 뿐이며 실제 교통약자에게 향상된 이동편의를 제공하지 못하고 있다. 따라서 본 연구에서는 교통약자의 보행에 영향을 미치는 경사로, 계단과 같은 물리적 장애 요소들을 고려하여 교통약자 유형별 최적경로를 탐색하는 기법을 제안함으로써 교통약자의 이동편의를 직접적으로 향상시키고자 한다. 선행연구 및 관련 제도를 분석하여 교통약자의 보행에 방해가 되는 보행장애요소를 선정하고 계층적의사결정법(Analytic Hierarchy Process; AHP)을 이용하여 각 보행장애요소의 상대적 중요도를 산정하였으며 마지막으로 퍼지 시스템을 통하여 교통약자의 보행에 방해되는 정도를 나타내는 링크별 보행방해도를 도출한다. 보행방해도를 바탕으로 거리 요소를 포함한 보행 경로비용을 계산하고 이 값이 최소가 되는 경로를 다익스트라 알고리듬을 통해 탐색함으로써 교통약자 유형별 최적 경로를 제공한다. 본 연구에서 제안한 기법을 적용하여 도출된 19개 경로를 대상으로 실제 현장 실험을 통하여 각 경로에 대한 만족도 설문조사를 수행하였고 이를 통해 실제 교통약자의 이동에 편의를 향상하는 유의미한 경로가 도출되었음을 확인하였다. 본 연구에서 제안한 최적경로 탐색 기법이 내비게이션 서비스에 적용된다면 교통약자의 이동복지향상을 도모할 수 있을 것으로 보인다.

• 한국재료학회지
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• 제26권6호
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• pp.342-346
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• 2016

To observe the bonding structure and electrical characteristics of a GZO oxide semiconductor, GZO was deposited on ITO glasses and annealed at various temperatures. GZO was found to change from crystal to amorphous with increasing of the annealing temperatures; GZO annealed at $200^{\circ}C$ came to have an amorphous structure that depended on the decrement of the oxygen vacancies; increase the mobility due to the induction of diffusion currents occurred because of an increment of the depletion layer. The increasing of the annealing temperature caused a reduction of the carrier concentration and an increase of the bonding energy and the depletion layer; therefore, the large potential barrier increased the diffusion current dna the Hall mobility. However, annealing temperatures over $200^{\circ}C$ promoted crystallinity by the defects without oxygen vacancies, and then degraded the depletion layer, which became an Ohmic contact without a potential barrier. So the current increased because of the absence of a potential barrier.