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이용우 ( Lee¸ Yongwoo ),이연실 ( Lee¸ Yonsil ),이준엽 ( Lee¸ Joonyup ) 한국자치행정학회 2021 한국자치행정학보 Vol.35 No.3
위기는 누구에게나 당면할 수 있는 문제이며, 사회가 급변하는 과정에서 나타나는 사회구조적인 요인은 가족기능을 약화시켜 가정의 위기를 경험하게 한다. 이에 본 연구는 위기가정들이 경험하는 구체적인 삶의 변화와 적응과정에 대해 살펴보고 성공적 재기에 관한 함의를 도출하고자 한다. 본 연구의 목적은 위기가정 재기지원 과정에 직접 참여한 위기가구들의 경험을 질적연구 방법 중 하나인 사례연구를 통해 분석하는 것이다. 이를 위해 8명의 연구 참여자에 대해 심층인터뷰를 실시하여 자료를 수집하였으며, 수집한 자료들은 사례 내 분석과 사례 간 분석을 실시하였다. 이를 통해 나타난 참여 경험의 주요한 주제들은 위기과정 경험과 재기과정 경험을 중심으로 각각 4개의 주제가 도출되었다. 위기과정 경험에서 도출된 주제는 자포자기, 쫓기는 삶, 백지상태, 벼랑 끝 절벽의 4가지이며, 그들이 재기과정에서 경험한 주제는 심리적 안정감, 계획과 목표가 생김, 무지개, 절벽에서 들판으로의 4가지 주제가 도출되었다. 본 연구는 질적 사례연구로서 위기가정이 실제로 위기를 경험했던 내용과 재기과정에서의 구체적 경험에 대한 실체적 이해를 제공하였다는데 그 의의가 있다. 이러한 분석결과를 바탕으로 위기 가정들의 적응과정 및 삶의 어려움을 지원하기 위한 사회복지의 실천적·제도적 방안을 모색하였다. Crisis is a problem that anyone can face. Social structural factors appearing in the process of rapid social change weaken family functions and cause family crises. Therefore, this study examines the specific life changes and adaptation processes among crisis families and attempts to derive implications for successful recovery. The purpose of this study is to analyze the experiences of crisis families who directly participated in the crisis family recovery support process through a qualitative case study. Data were collected by conducting in-depth interviews with eight research participants. The collected data were analyzed to explore differences within and between cases. As a result, four themes were derived based on the experience of the crisis and recovery process: desperation, life being chased, a blank slate, and the cliff edge. was derived. Four sub-themes were also emerged: a sense of psychological stability, having new plans and goals, rainbow, and from cliff to field. As a qualitative case study, this study contrubutes to better and substantive understanding of what crisis families actually experienced and the specific experiences in the recovery process. This study provides practical and institutional ways that support the adaptation process and life difficulties of crisis families.
Lee, Ki-Heon,Lee, Jeong-Hoon,Kang, Hee-Don,Park, Byoungnam,Kwon, Yongwoo,Ko, Heejoo,Lee, Changho,Lee, Jonghyuk,Yang, Heesun American Chemical Society 2014 ACS NANO Vol.8 No.5
<P>Green CdSe@ZnS quantum dots (QDs) of 9.5 nm size with a composition gradient shell are first prepared by a single-step synthetic approach, and then 12.7 nm CdSe@ZnS/ZnS QDs, the largest among ZnS-shelled visible-emitting QDs available to date, are obtained through the overcoating of an additional 1.6 nm thick ZnS shell. Two QDs of CdSe@ZnS and CdSe@ZnS/ZnS are incorporated into the solution-processed hybrid QD-based light-emitting diode (QLED) structure, where the QD emissive layer (EML) is sandwiched by poly(9-vinlycarbazole) and ZnO nanoparticles as hole and electron-transport layers, respectively. We find that the presence of an additional ZnS shell makes a profound impact on device performances such as luminance and efficiencies. Compared to CdSe@ZnS QD-based devices the efficiencies of CdSe@ZnS/ZnS QD-based devices are overwhelmingly higher, specifically showing unprecedented values of peak current efficiency of 46.4 cd/A and external quantum efficiency of 12.6%. Such excellent results are likely attributable to a unique structure in CdSe@ZnS/ZnS QDs with a relatively thick ZnS outer shell as well as a well-positioned intermediate alloyed shell, enabling the effective suppression of nonradiative energy transfer between closely packed EML QDs and Auger recombination at charged QDs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-5/nn500852g/production/images/medium/nn-2014-00852g_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn500852g'>ACS Electronic Supporting Info</A></P>
Electromyographic analysis according to shoe weight during ambulation
Lee, Eunsang,Lee, Byunghoon,Cho, Juchul,Lee, Yongwoo,Lee, Seungwon korean Academy of Physical Therapy Rehabilitation 2015 Physical therapy rehabilitation science Vol.4 No.2
Objective: To examine the effects of different shoe weights on lower leg muscle fatigue when walking by electromyographic (EMG) analysis due to the most effective weight for loading not being established. Design: Cross-sectional study. Methods: Thirty healthy university students (15 male, 15 female) were enrolled and randomly assigned into three conditions, which included wearing athletic shoes with an addition of 300 g, 500 g, and 1,000 g weights respectively. Prior to walking, all subjects were instructed to sit in a chair for 10 minutes. All subjects walked at a speed of 3.6 m/s on a treadmill for 20 minutes without rest. EMG measurements were taken using the median power frequency to assess for the effect of the different weight of shoes on muscle fatigue of the soleus, gastrocnemius, and tibialis anterior while walking on a treadmill in an upright posture. EMG measurements were taken during the first and last 30 seconds of walking. Results: In terms of muscle fatigue, for the soleus, the median power frequency was significantly lower with 1,000 g compared with 300 g and 500 g (p<0.05). For the tibialis anterior, the median power frequency was significantly lower with 1,000 g than 300 g and 500 g (p<0.05). For the gastrocnemius, the median power frequency was significantly lower with 1,000 g compared with 300 g (p<0.05). Conclusions: Increased shoe weight increases soleus, gastrocnemius, and tibialis anterior muscle fatigue during ambulation.
이윤지(Yunjee Lee),김한중(Hanjung Kim),방승연(Seungyeon Bang),이용우(Yongwoo Lee),이도해(Dohae Lee),이인권(In-Kwon Lee) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문은 3 차원 상에서 빠르게 움직이는 물체가 촬영된 비디오에 모션블러가 존재할 때, 촬영된 물체의 상태와 모양을 추론하고 미래 움직임을 예측하는 모델을 제안한다. 모션블러가 발생한 동영상에서 물체의 위치와 속도를 추론하고 미래의 움직임을 예측하는 모델을 제안한 연구[1]가 있었지만, 3 차원 공간에서 움직이는 물체에는 적용할 수 없었으며, 원형의 물체에만 적용 가능하였다. 본 논문은 기존 연구[1]에서 제안된 모델을 확장하여 3 차원 상에서 움직이는 다양한 형태의 물체에 대해 미래의 움직임을 예측할 수 있는 방법을 제안한다. 실제 비디오와 유사하게 생성한 가상 데이터로의 실험을 통해 제안된 모델이 물체의 상태와 모양, 그리고 미래 궤적을 높은 정확도로 예측할 수 있음을 보였다.
이세영(Seyoung Lee),이선민(Sunmin Lee),이용우(Yongwoo Lee),이제희(Jehee Lee) 한국컴퓨터그래픽스학회 2021 한국컴퓨터그래픽스학회 학술대회 Vol.2021 No.7
우리는 단일 모션 클립에서 매개 변수화된 모션 집단을 학습하는 새로운 알고리즘을 제시한다. 각 동작은 심층정책 네트워크로 표현되며, 연속적인 동작 공간을 탐색하여 사용자 입력 및 환경 상호 작용에 대응하여 물리 시뮬레이션 상에서 모션을 생성한다. 모션 매개 변수화와 동작 추적의 동시 학습은 학습된 모터 기술의 성능과 시각적 품질을 크게 향상시킨다. 우리는 매우 역동적인 동작들을 작업 목표, 신체 비율, 물리적 수치 및 환경 조건에 대해 매개 변수화하여서 알고리즘의 유연성을 입증했다.
Li, Meng,Shin, Hong-Sik,Jeong, Kwang-Seok,Oh, Sung-Kwen,Lee, Horyeong,Han, Kyumin,Lee, Yongwoo,Lee, Song-Jae,Lee, Ga-Won,Lee, Hi-Deok Institute of Pure and Applied Physics 2014 Japanese Journal of Applied Physics Vol. No.
<P>H2O or NH4OH (5%) precursor pretreatment in the chamber was carried out before the thermal atomic layer deposition (ALD) of an Al2O3 passivation layer on p-type crystal Si. It was found that the density of negative oxide fixed charges significantly increased, the Al-O combination at the interface changed, the Al/O atomic at the interface of Al2O3/Si decreased, and the effective lifetime increased. The pretreated samples with changes in the Al-O structure at the interface, which made the interface more oxygen-rich, were believed to be the reason for the improvement of the field effect passivation in Al2O3 passivated crystal Si solar cell applications. (C) 2014 The Japan Society of Applied Physics</P>
Lee, Yoojin,Bae, Seonghyun,Hwang, Byungil,Schroeder, Marc,Lee, Yongwoo,Baik, Seunghyun The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.39
<P>There have been significant improvements in conductive stretchable fibers and fabrics over the last few decades. However, the durability against washing (<I>i.e.</I>, washability) still remains as a challenging issue hindering practical applications for wearable electronics. In this study, the water and oil washability of conductive stretchable nanocomposite fibers were significantly improved by the covalent functionalization with trichloro(1<I>H</I>,1<I>H</I>,2<I>H</I>,2<I>H</I>-perfluorooctyl)silane (FOTS). The highly conductive (∼14 600 S cm<SUP>−1</SUP>) stretchable AgPU fibers were synthesized by the wet spinning technology using flower-shaped silver nanoparticles and polyurethane (PU). The PU surface of the fiber was firstly treated by Ar plasma to induce reactive hydroxyl groups for the covalent binding with the silane molecules. The vapor-phase FOTS deposition was then carried out to synthesize FOTS-AgPU fibers. Both hydrophobicity and oleophobicity significantly improved after the functionalization. There was negligible change in the electrical conductivity, mechanical strength, and rupture strain of the FOTS-AgPU fiber after 8 thorough detergent water washing cycles, demonstrating almost perfect water washability with laundry detergent. The thermal conductivity slightly decreased by 10% since it was more challenging to maintain the phononic thermal transport than the electrical transport. The oil washability was also improved although perfect passivation could not be achieved. The FOTS layer could also be directly functionalized on the AgPU fabric, instead of the AgPU fibers, demonstrating the possibility of facile up-scale post-functionalization. The conductive stretchable fibers and fabric with improved water and oil washability may find immediate applications for wearable electronics.</P>