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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.
Seok-Gyu Kim,Pil-Young Yun,Hyun-Sik Park,June-Sung Shim,Jung-Won Hwang,Young-Kyun Kim 대한치과보철학회 2012 The Journal of Advanced Prosthodontics Vol.4 No.1
PURPOSE: The purpose of this prospective study was to evaluate the effect of early loading on survival rate or clinical parameter of anodic oxidized implants during the 12-month postloading period. MATERIALS AND METHODS: Total 69 implants were placed in 42 patients. Anodic oxidized implants (GS II, Osstem Cor., Busan, Korea) placed on the posterior mandibles were divided into two groups, according to their prosthetic loading times: test group (2 to 6 weeks), and control group (3 to 4 months). The implant survival rates were determined during one-year postloading period and analyzed by Kaplan-Meier method. The radiographic peri-implant bone loss and periodontal parameters were also evaluated and statistically analyzed by unpaired t-test. RESULTS: Total 69 implants were placed in 42 patients. The cumulative postloading implant survival rates were 88.89% in test group, compared to 100% in control group (P<.05). Periimplant marginal bone loss (T: 0.27±0.54 mm, C: 0.40±0.55 mm) and periodontal parameters showed no significant difference between the groups (P>.05). CONCLUSION: Within the limitation of the present study, implant survival was affected by early loading on the anodic oxidized implants placed on posterior mandibles during one-year follow-up. Early implant loading did not influence peri-implant marginal bone loss, and periodontal parameters.