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Hwang, Tae Gyu,Han, Gi Rim,Lee, Jae Moon,Lee, Jong Woo,Kim, Hong Mo,Hwang, Doyk,Kim, Seong Keun,Kim, Jae Pil American Chemical Society 2019 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.123 No.39
<P>Herein, we report significant fluorescence quenching induced by intramolecular photoinduced electron transfer (PET) in electron donor-acceptor-type π-conjugated organic molecules with methoxy-containing donor moieties. The fluorescence quenching of the diketopyrrolopyrrole (DPP, a well-known highly emissive luminophore) derivatives seemed to be affected by the methoxy moieties. Steady-state optical properties of the synthesized materials were analyzed in the solution, aggregate (<I>N</I>-methyl-2-pyrrolidone/H<SUB>2</SUB>O), and solid states in order to understand the influence of the surrounding environment. The mechanistic aspect of the intramolecular PET process in methoxy-containing DPP derivatives was revealed by singlet oxygen generation measurements and ultrafast femtosecond transient absorption spectroscopy. These results could provide crucial insights toward designing emissive π-conjugated organic molecules.</P> [FIG OMISSION]</BR>
윤덕로,강대희,이승준,주영수,박진구,황호영,황필규,황은주,황예원,성주헌,홍순범,황승식,황재욱,조수헌 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.1
Industrialization has introduced various working systems into the modern society. Shift work is a good representative among those. So far various adverse health effects, possibly caused by this shift work, have mainly been reported in the fields of manufacturing industry by many other researchers ; sleep disorders, gastrointestinal disorders and cardiovascular disorders and so on, These health effects were thought to be caused by the changes of circadian rhythm on shift working. This study was especially planned to evaluate effects of shift work on sleep disorders among shift-working medical manpower like hospital nurses, important persons dealings with lives, and ultimately to provide them with basic evidence for improving work environment. The study subjects were arbitrarily selected among shift-working female nurses and day-working female pharmacists in one university hospital in Seoul, and finally 79 nurses and 58 pharmacists were enrolled. The research was conducted by using self-administered questionnaire, consisting of items about socio-behavioral factors including demographic factors which can affect sleep patterns and questions which make it possible to evaluate sleep disorders(e.g. sleeping duration, sleep latency, re-sleep latency, days of insomnia per week, drug use for sleep, and subjective symptoms). The result showed that the shift workers had significantly longer sleep and re-sleep latency, more days of insomnia, and a stronger likelihood of using drugs when they had sleep difficulty than day-working pharmacists. And the number of night shift duties per month was discovered as the only significant predictor of sleep latency. Additionally, the subjective symptoms related to sleep disorders when awake and at work, showed negligible differences between the shift workers and dayworkers. In conclusion, we found shift-work was risk factor for sleep disorders.
황재정,황치규,박종필 群山大學校 情報通信技術硏究所 1998 情報通信技術硏究論文集 Vol.2 No.-
Rate-distortion theory means that the lower limit of transmission rate is determind according to the distortion quantity. This theory is fundamentally important factor in the visual system without visually sensitive distortion. Rate-distortion theory originating in the notion of information quantity is derived using probability distribution of orignal signal and measurement of distortion. In this paper, we develop the R(D) function with the distribution function of Gaussian and Laplacian, using the absolute error criteria and the square error criteria. Then we applied these functions to H.263 video coder at very low-bitrate. Though the Laplacian and Gaussian distribution can be applied, we show that the lowest point on which the rate becomes zero is lower in the case of Laplacian than in the case of Gaussian.
Jung-Pil Suh,Sang-Nag Ahn,Young-Chan Cho,Kyong-Ho Kang,Im-Soo Choi,Yeon-Gyu Kim,Hak-Soo Suh,Hung-Goo Hwang 한국육종학회 2005 한국육종학회지 Vol.37 No.5
An interspecific BC3F2 population (Milyang 23/O. glaberrima/3*Milyang 23) consisting of 141 lines was evaluated for8 traits associated with yield. Oryza glaberrima (IRGC #103544) was phenotypically inferior to all of the traits examined in thisicle and grain yield. A genetic linkage map generated for this population consisted of 124 SSR markers with an average intervallength of 13.1 cM. The percentage of O. glaberrima genome, which was calculated on the number of the exotic gene introgres-sions contained in the 141 BC3F2 lines, ranged from 3.9 to 25.4% with a mean of 12.8%. Of the 37 QTLs associated with yield andyield components, 24 alleles from O. glaberrima were favorable. However, eight QTLs were significantly associated with yieldand five alleles of O. glaberrimafrom 1.5 to 2.2 tons/ha. Exploitation of the genetic potential of exotic species using molecular markers might provide a new oppor-tunity to improve yield and quantitative traits in rice breeding program.
조규필 ( Gyu Pil Cho ),박현진 ( Hyun Jin Park ),김래선 ( Lae Sun Kim ),김범구 ( Bum Goo Kim ),양대희 ( Dae Hee Yang ),이현진 ( Hyun Jin Lee ),황수진 ( Soo Jin Hwang ) 경북대학교 중등교육연구소 2011 중등교육연구 Vol.59 No.4
본 연구는 학업중단 시기를 거쳐 학교에 복학한 청소년들의 학교 재적응 과정을 탐색하는데 목적이 있다. 이를 위해 복학한지 6개월 이상 경과한 전문계 고등학생 11명을 연구 참여자로 선정하여 심층면접을 진행하였으며, Strauss와 Cobin(2008)이 제시한 근거이론에 따라 질적분석을 실시하였다. 분석결과 개방코딩에서 133개의 개념과 42개의 하위범주, 그 하위범주를 추상화시킨 19개의 범주가 도출되었다. 핵심범주는 ``학업동기 발생``으로 나타났다. 참여자들은 학업동기화 전에 ``자신의 상황에 대한 인식``이 생기고, ``주변 사람들의 영향``을 받게 된다. 그 이후 ``학업동기가 발생``하고, ``학교에 재적응``하는 과정에서 ``각오를 다지고 습관을 변화``시키며, ``가족을 생각``하며, ``친구관계를 형성``하는 경험을 하게 된다. 이러한 학교 재적응 과정 전반에 미치는 조건은 ``부모·친구·교사·전문가의 지원``이 있었고, 학교 재적응으로 나타난 결과는 ``학교생활 적응``, ``비행 중단``, ``꿈이 생김``으로 나타났다. 본 연구의 의의는 학업중단 청소년의 학교 복학 후 재적응 과정을 탐색함으로써 복학생들이 재탈락하지 않도록 조력하기 위한 개입방법의 틀을 마련하는 근거를 제공하였다는 데 있다. The purpose of this study was to investigate school readaptation process of youth who had dropped out of school. For this, The researchers conducted in-depth interviews with 11 vocational high school students who had returned school at least over 6 months, and performed Qualitative Analysis based on the guidance of the Ground Theory of Strauss and Cobin(2008). Open coding results in 133 concepts, 42 sub-categories followed by 19 more abstracted categories. The core category was ``academic motivation``. Participations had perceived the situation and had affected by people around them before they had motivation to return to school. In the process of ``having motivation`` and ``re-adaptation in the school``, they experienced ``reestablishment determination``, ``changing habits``, ``thinking family`` and ``building up friendship``. A support of parent, friends, teachers, and expert was significant conditions to affect the process of school re-adaption. The results of school re-adaption were ``school adaptation``, ``discontinuance delinquent`` and ``having a dream``. Based on the qualitative analysis, this study provides the framework for practical supporting method to prevent re-dropout of returned students.