2,580,183 research outputs found
Oracle Estimation of a Change Point in High-Dimensional Quantile Regression
No full text© 2018, © 2018 The Author(s). Published with license by Taylor & Francis. © 2018, © Sokbae Lee, Yuan Liao, Myung Hwan Seo and Youngki Shin. In this article, we consider a high-dimensional quantile regression model where the sparsity structure may differ between two sub-populations. We develop ℓ1-penalized estimators of both regression coefficients and the threshold parameter. Our penalized estimators not only select covariates but also discriminate between a model with homogenous sparsity and a model with a change point. As a result, it is not necessary to know or pretest whether the change point is present, or where it occurs. Our estimator of the change point achieves an oracle property in the sense that its asymptotic distribution is the same as if the unknown active sets of regression coefficients were known. Importantly, we establish this oracle property without a perfect covariate selection, thereby avoiding the need for the minimum level condition on the signals of active covariates. Dealing with high-dimensional quantile regression with an unknown change point calls for a new proof technique since the quantile loss function is nonsmooth and furthermore the corresponding objective function is nonconvex with respect to the change point. The technique developed in this article is applicable to a general M-estimation framework with a change point, which may be of independent interest. The proposed methods are then illustrated via Monte Carlo experiments and an application to tipping in the dynamics of racial segregation. Supplementary materials for this article are available online
Kmentophylus albopilosus Duwal & Yasunaga & Lee 2010, comb. nov.
No full textKmentophylus albopilosus (Duwal, Yasunaga & Lee, 2010) comb. nov. Aplagiognathus albopilosus Duwal, Yasunaga & Lee, 2010: 6.Published as part of Duwal, Ram Keshari, Yasunaga, Tomohide & Lee, Seung-Hwan, 2010, Kmentophylus nom. nov., a new substitute name for Aplagiognathus (Heteroptera: Miridae) in Acta Entomologica Musei Nationalis Pragae 50 (2
Paralympic Men\u27s slalom 1st run (LW1-LW12) - Hwan Kyang Lee, Korea
No full textMen\u27s slalom 1st run (LW1-LW12): Hwan Kyang Lee, Korea, LW2 Class, skiing around a pole at Snowbasin ski area during the 2002 Winter Paralympics
Stages of higher physical education in the republic of Korea (the case of the national university, city of Мокро)
No full textЛи Ин-Хван, аспирант кафедры теоретических основ физического воспитания факультета физической культуры и спорта Красноярского
государственного педагогического университета им. В.П. Астафьева (г. Красноярск); тел. 8-391-2112939; E-mail: [email protected]
Lee In Hwan, a postgraduate of theoretical physical training basis department, physical training and sport department Krasnoyarsk State Pedagogical University
after V.P. Astafiev (Krasnoyarsk); Ph. 8-391-2112939;
E-mail: [email protected]Рассматриваются исторические этапы становления высшего физкультурного образования в Республике Корея, его программно-методическое обеспечение.
Рассмотрены учебные планы и программы высших физкультурных учебных заведений и поиски путей их интеграции в мировое физкультурно-спортивное пространство. The article presents the historical stages of physical culture higher education in the Republic of Korea and its program and methodological support. The study plans, the programs of higher sports educational institutions and ways of their integration into world physical education were considered
LEE HWAN PIL
No full text학위논문(박사)--아주대학교 일반대학원 :건설교통공학과,2011. 2본 연구에서는 고속도로 교통류 관리를 위해 시행 중인 톨게이트 진입제어기법과 관련하여 교통관리자가 교통상황의 변동에 따라 능동적으로 대처할 수 있는 톨게이트 진입제어모형을 개발하였다. 모형개발을 위해 현재 시행되고 있는 한국도로공사 톨게이트 진입제어기법의 문제점을 진단하여 기존의 기법보다 나은 제어효과를 도출할 수 있도록 검지체계, 혼잡판단지표, 판단기준, 혼잡관리단위를 개선하였고 톨게이트 진입제어를 위한 체계적인 절차를 수립하였다. 이와 함께, 톨게이트 및 고속도로 본선의 특성분석을 수행, 필요한 항목에 대해서는 모형개발 시 활용하였다.
개발모형은 톨게이트 진입제어 시행절차를 구현할 수 있도록 크게 교통상황 진단, 톨게이트 조절, 통행속도 산출 기능으로 구성하였다. 교통상황 진단기능은 고속도로 본선에 설치된 Hi-Pass용 DSRC에서 수집되는 구간통행속도를 기반으로 교통류 상태를 분류하며 시․공간적인 혼잡 검지를 수행한다. 톨게이트 조절기능은 교통류 상태에 따라 톨게이트 개폐부스를 산정하며 이에 따라 본선진입교통량을 조절한다. 통행속도 산출기능은 진입제어 실시에 따른 교통류 변화를 확인하기 위해 본선진입교통량 변동에 의한 구간통행속도를 산출한다. 이러한 모형 구성을 통해 운영자 개입없이 검지자료에 기반한 톨게이트 진입제어의 전과정 절차화, 자동화하였다.
개발모형의 효과분석을 위해 톨게이트 진입제어모형을 구현한 효과분석 툴을 이용, 분석을 수행하였으며 혼잡기준속도를 80km/h로 적용하였을 때 톨게이트 진입제어 미시행시 및 기존 한국도로공사방안에 비해 통행속도가 각 21.5%, 8.8% 개선되는 것을 확인하였다.
마지막으로, 개발모형의 현장적용에 따른 제어효과를 증진시키기 위해서 대상톨게이트 선정방안, 운영전략, 개발모형 활용방안을 제시하였다.Ⅰ. 서 론 1
1. 연구의 배경 및 목적 1
2. 연구의 내용 2
3. 연구의 범위 및 수행절차 4
Ⅱ. 이론적 고찰 6
1. 톨게이트 진입제어 개념 6
2. 국내외 사례연구 14
3. 기존연구 고찰 26
4. 기존연구 및 사례분석결과에 따른 시사점 30
Ⅲ. 고속도로 특성분석 33
1. 톨게이트 특성분석 33
2. 고속도로 본선 특성분석 65
Ⅳ. 톨게이트 진입제어모형 개발 68
1. 모형 구성 68
2. 교통상황 진단 71
3. 톨게이트 조절 86
4. 통행속도 산출 96
Ⅴ. 운영전략 및 효과분석 103
1. 운영전략의 수립 103
2. 효과분석 111
Ⅵ. 개발모형 활용방안 122
1. 개발모형 온라인(On-Line) 시스템화 방안 122
2. 개발모형 적용방안 129
Ⅶ. 결론 및 향후 연구과제 132
1. 결 론 132
2. 향후 연구과제 135
참고문헌 136
Abstract 139Maste
An Experimental Study of Microleakage in Class Ⅱ Filling on Primary Molars with Glass Ionomer Silver Cermet Cement (KETAC SILVER®)
No full text치의학과/석사[영문]
[한글]
유구치의 제2급 와동에서 Glass lonomer Silver Cermet Cement (Ketac-Siker**(R))으로
충전한 경우의 변연누출과 일반적인 구치부 충전재료인 구치부용 복합레진과 아말감으로
충전한 경우의 변연누출을 비교하기 위하여 치관부나 인접면에 치아우식증, 충전물, 파
절등의 육안적 결함이 없는 68개의 유구치를 선택하여 93개의 제2급 파동을 형성하여 3군
으로 분류한후 제1군은 Ketac-Silver, 제2군은 P-50, 제3군은 Amalgam으로 충전한후 Meth
ylene Blue를 이용한 색소침투법에 의하여 변연누출을 측정하여 다음과 같은 결론을 얻었
다.
1. 교합 변연부와 치은 변연부 모두에서 Ketac-Silver충전군의 변연누출은 P-50충전군
에 비하여 유의성있게 크게 나타났으며 Amalgam충전군에 비하여 유의성있게 적게 나타났
다.
2. 모든 실험군에서 치은 변연부의 변연누출이 교합변연부외 변연누출보다 크게 나타났
으며 통계학적인 유의성이 있었다.
AN EXPERIMENTAL STUDY OF MICROLEAKAGE IN CLASS Ⅱ FILLING ON PRIMARY MOLARS WITH
GLASS I0NOMER SILVER CERMET CEMENT (KETAC SILVER**(R))
In Hwan Lee, D.D.S.
Dept of Dental Science, Graduate School, Yonsei University.
(Directed by Professor Jong Kap Lee, D.D.S., Ph.D.)
The propose of this study is the comparision of marginal leakage of the cases
filled with glass ionomer silver cermet cement (Ketac silver) and those of
posterior composite resin and amalgam which have been widely used as filling
materials in class Ⅱ cavity of primary molars.
The experimental primary molars were selected without any sign of dental caries,
filling bodys, tooth fracture and gross defects.
93 cavities were prepared and randomly divided into 3 group : the first group
were filled with Ketac silver, the second group were filled with P-50 as posterior
composite resin and the third group were filled with amalgam, resfectively.
Dye penetration method with methylene blue was applied for measuring marginal
leakage of 3 groups and the conclusion obtained was as follows ;
1. Marginal leakage of Ketac silver filling group was greater than P-50 filling
group and lessor than Amalgam filling group in occlusal, gingival margin and the
results showed statistical significance.
2. The gingival leakage was greater than occlusal marginal leakage in all groups
and this result showed statistical significance.restrictio
Concave Silica Nanosphere with a Functionalized Open-Mouthed Cavity as Highly Active and Durable Catalytic Nanoreactor
No full textDespite increasingly intensive research into catalytic hollow nanoreactors, most of the work has focused on the enclosed cavity structure, and attempts to use the open-mouthed cavity have not been made so far, most likely due to the lack of methodologies for producing and functionalizing such a structure. This paper reports a synthetic strategy toward open-mouthed cavity-based nanoreactors, which renders the SiO2 nanosphere with a concave surface and also immobilizes catalytic nanocrystals (NCs) specifically inside the concave region. By putting the Janus silica-encapsulated manganese oxide (MnO) nanoparticle, with its highly off-centered core@shell structure, through the thermal hollow-conversion process, the edge-touching MnO nanoparticle was transformed into a hollow hemispherical manganese silicate layer with an opening to the outside, thus producing the bitten apple-like structure, conc-(Ni/HMS)@SiO2, with an open-mouthed cavity on the SiO2 nanosphere. The galvanic replacement reaction occurring on the manganese-silicate layer of the conc-(Ni/HMS)@SiO2 afforded the site-specific immobilization of catalytic Pt NCs on the preformed concave interior surface, signifying the possible postsynthetic functionalization of an open-mouthed cavity which could be adapted for the development of a nanoreactor system. The newly developed nanoreactor, Pt@conc-SiO2, carrying tiny catalytic Pt NCs inside the semiexposed and also semiprotected pocket-like space, exhibited an increased reaction rate and a more extended range of applicable substrates in catalyzing the reduction of nitroarene compounds, compared with the enclosed cavity-based analogue, while preserving the high immobilization stability of Pt nanocatalysts during the recycling process.1151sciescopu
Violent Experiences and Coping among Home Visiting Health Care Workers in Korea
No full textPurpose: The purpose of this study was to explore violent experiences of home visiting health care workers in Korea. Methods: This study was a cross-sectional survey. Data were collected using self-report questionnaires from 1,640 health care workers. Data collection was done between September 1, 2009 and June 30, 2010. Results: Of the respondents, 70.6% had experienced work-related violence. Shouting (51.9%) was the most common verbal violence, followed by verbalizing sexual remarks to the health care workers (19.0%) and touching the hands (16.5%), the most common acts relating to sexual harassment. Of the respondents who had experienced violence, 50.9% told their peers about the incidents. However, the major reasons why they did not report these incidents was due to the fact that they felt it was useless to file reports and that they expected such incidents to occur as part of their job. The majority of the respondents (86.4%) wanted education on how to deal with such violence at work. Conclusion: The results of this study indicate that efforts should be made to increase awareness and to minimize violence in the workplace. Also, educational programs should be designed to improve knowledge and to prevent work-place violence.N
DEBvscTACE_supplement_20190516_clean – Supplemental material for Effectiveness of drug-eluting bead transarterial chemoembolization versus conventional transarterial chemoembolization for small hepatocellular carcinoma in Child-Pugh class A patients
No full textSupplemental material, DEBvscTACE_supplement_20190516_clean for Effectiveness of drug-eluting bead transarterial chemoembolization versus conventional transarterial chemoembolization for small hepatocellular carcinoma in Child-Pugh class A patients by In Joon Lee, Jeong-Hoon Lee, Yun Bin Lee, Yoon Jun Kim, Jung-Hwan Yoon, Yong Hu Yin, Myungsu Lee, Saebeom Hur, Hyo-Cheol Kim, Hwan Jun Jae and Jin Wook Chung in Therapeutic Advances in Medical Oncology</p
Challenging issues and solutions of bridge inspection technology using unmanned aerial vehicles
No full textIt is expected that bridge inspection using unmanned aerial vehicles (UAVs) equipped with imaging devices is able to improve public safety and structural reliability by providing the close detail of a bridge appearance. Thus, interests in bridge inspection using UAVs are increasing worldwide. However, at present, most of them simply use commercially available UAVs to acquire images of parts of the bridge that are difficult to access (e.g., upper parts of the pylons in long-span bridges). It cannot meet the final goal of bridge inspection that is to assess the condition of the bridge. Therefore, this approach is still considered to be at an early stage from a practical point of view and a more systematic and reliable approach is needed. In this paper, challenging issues of bridge inspection using UAVs are identified and their solutions are presented. To this end, a recently launched research project is introduced by describing the developing core technologies such as a new UAV-localization algorithm without GPS, noncontact inspection techniques based on data fusion of hybrid images and a bridge condition evaluation technique based on the processed data originally obtained from UAVs. Some interim results of field tests are also presented
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