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누적외상성질환 위험 요인의 정량적 평가 및 관리를 위한 점검표 개발 : 자동차 조립 작업을 중심으로
이윤근,김현욱,임상혁,박희석 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.1
Objectives : This study was designed to develop and standardize a checklist for ergonomic risk factors, and to provide ergonomic guidelines for managing cumulative trauma disorders (CTDs) in automobile assembly lines, Methods : The Checklist for Ergonomic Risk Factors(CERF-1) was developed based on the results of previous studies, and then modified after performing pilot study. Information on the symptoms possibly related with CTDs was obtained using a self-reported questionnaire from 465 automobile assembly workers. Their job conditions were examined to assess risk factors through both direct observation and video analysis. Results : Rate of detecting risky job through CERF-1 was 85.6%, and was similar to that (88.8%) by Occupational Safety and Health Adminstration(OSHA) checklist but higher than that (63.7%) by American National Standards Institute(ANSI) Z-365. Relationship of the exposure scores derived from CERF-1 with levels of symptom was greater (r=0.49) than OSHA(r=0.28) and ANSI Z-365 (r=0.22). Considering the relationship, jobs scoring higher than 16 could be classified as the Risk Job, and lower than 16 as then Low Risk Job. Sensitivity and specificity of the Risk Job were 92.5% and 31.5 %, respectively. Odds ratio (OR) after age adjus-tment was 5.69 (95% confidence interval 3.15-10.29) for the Risk Job, and these ORs were significantly different from those of the Low Risk Job. The exposure scores were quite valid, in that the scores at the main survey were significantly correlated with those at the follow-up survey, as suggested by test-retest(r=0.88) and inter-rate reliability(r=0.80) Conclusions:The CERF-1, developed in this study, will be an efficient tool for evaluation of risk jobs for CTDs in automobile assembly lines, and can be used easily by health care providers.
다량의 하부위장관출혈이 병발된 Vibrio vulnificus 패혈증 1예
최주연,유진홍,한석원,이대훈,최민호,박순민,김연식,김선우,신완식,강문원,강성구 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.2
최근 저자들은 Vibrio vulnificus 감염에 의해 패혈증 및 이차성 피부 병변을 보인 42세의 남자 환자의 치료중 하부 위장관 출혈이 병발된 1예를 경험하였기에 보고하는 바이다. We experienced a case of Vibrop vulnificus septicemia which showed an unusual manifestation such as hematochezia. The patient was a 42-year-old man with chronic liver disease. The blood and wound culture revealed the organism. During intensive care, he suffered from massive hematochezi for several days. Colonoscopy and abdominal CT showed findings suspicious of ischemic colitis. To our knowledge, this is the first unusual case of V.vulnificus infection which showed massive lower gastrointestinal bleeding.
중합광원과 레진 색상이 복합레진의 중합깊이에 미치는 영향
나준석,정선와,황윤찬,김선호,윤창,오원만,황인남 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.6
Purpose of this research is estimating polymerization depth of different source of light. XL 3000 for halogen light, Apollo 95E for plasma arc light and Easy cure for LED light source were used in this study. Different shade (B1 & A3) resin composites (Esthet-X, Dentsply, U.S.A.) were used to measure depth of cure. 1, 2, and 3 mm thick samples were light cured for three seconds, six seconds or 10 seconds with Apollo 95E and they were light cured with XL-3000 and Easy cure for 10 seconds, 20 seconds, or 40 seconds. Vicker's hardness test carried out after store samples for 24 hours in distilled water. Results were as following. 1. Curing time increases from all source of lights. curing depth increased(p<0.05). 2. Depth (that except 1mm group and 2mm group which lighten to halogen source of light) deepens in all groups, Vicker's hardness decreased(p<0.05). 3. Vicker's hardness of A3 shade composite was lower in all depths more than B1 shade composites in group that do polymerization for 10 seconds and 20 seconds using halogen source of light(p<0.05), but group that do polymerization for 40 seconds did not show difference(p>0.05). 4. Groups that do polymerization using Plasma arc and LED source of light did not show Vicker's hardness difference according to color at surface and 1mm depth(p>0.05), but showed difference according to color at 2mm and 3mm depth(p<0.05). The results showed that Apollo 95E need more polymerization times than manufacturer's recommendation (3 seconds), and Easy cure need polymerization time of XL-3000 at least.
유기 전계 발광 소자(OELD) 개발을 위한 PVK 박막의 특성 연구
河潤卿,魯碩源 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
Organic-based electroluminescent devices have attracted lots of interests because of their possible applications as large-area flat panel display. The devices that were used in this study were fabricated with poly(9-vinylcarbazole)(PVK) of two different molecular weights. The molecular weights of PVK for the devices were 58,600 and 1,100,000. UV/vis absorption peaks of both PVK films appeared at 296, 330,344nm. PL spectra and EL spectra of both PVK films showed the same pattern around 420nm. Thickness of both PVK films was determinad. For both PVK films, as increased coating rpm, thickness decreased. The film thickness decreased exponentially. Thickness of 1,100,000 PVK was higher than that of 58,600 PVK.
河潤卿,魯碩原 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1
2,4,6-Triphenyl-1,3,5-Triazine (TRZ) has been used as a hole blocking material for electroluminescent device(ELD)[4]. The EL devices of the four layer structure, ITO/hole transporting layer(HTL)/emitting layer/Al, were fabricated. TRZ was doped into the poly(n-vinylcarbazole)(PVK), which was spin-coated on indium tin oxide(ITO) film. The emitting layer, tris(8-hydroxyquinoline)aluminum(Alq₃), was deposited on top of PVK film. The ELD emits characteristic green color generated from Alq3 emitting layer. As the percentage of TRZ was increased, the efficiency of devices increased. The devices, which contained higher concentration of blocking material, were driven at a lower current under the same voltage. The optimum concentration of hole blocking material was 10wt%, which produced the highest ELD luminescence.
李慶善,尹錫山,金時泰 한양대학교 한국학연구소 1988 韓國學論集 Vol.14 No.-
The purpose of this study lies in grasping of the whole character of Korean poetry in the modernization period. As a method of research, this study divides the modernization period into two terms. Then it examines how the poetic patterns of each term originated and died away. Furthermore, this study closely examines the individual characteristics which the poetic patterns of each poetry had and focuses on comprehending the generl character of the literature in midernization period by integrading those characteristics. As a result, we come to a conclusion that literature in the modernization period has played a decisive role in laying the foundation for the full-scale modern literature in the swirl of tension between maintenance(tradition) and change(alien culture). As a preliminary to solving the task of this study, this study has surveyed the historical background of the modernization period centering on each class in charge of literature and traced how each class chose a certain pattern of poetry according to their characteristics. As a result, we came to the conclusion that the social and cultural background which are the historical requisite to the formation of the literature of the modernization period was instrumental to understanding the basic characters and forms of the literature in the midernization period.
박제선,윤경구,이주형,용석응 江原大學校 産業技術硏究所 1997 産業技術硏究 Vol.17 No.-
This study was conducted to evaluate durability of concrete which are increasingly demanded recently. Concrete durability properties incorporating waste foundry sand was performed with the variable of W/C ratio, Sand/Waste foundry sand ratio and Air entrainment-Non air entrainment. Cylinder specimens were made and subjected to freezing and thawing cycle at -18℃ and 4℃. Dynamic modulus of elasticity were as F/T cycle increase. The results show that decreasing W/C ratio and AE concrete makes improved resistance of freezing and thawing improved. Especially, resistance for freezing and thawing is improved by Fine aggregate/Waste foundry sand ratio which is 50%, 25%, 0% in a row.
Soybean growth and yield response to elevated temperature and light intensity
Young-Son Cho,Sok-Dong Kim,Bon-Chul Koo,Won-Ha Yang,Jin-Chul Shin,Young-Han Yun1,Joung-Gon Kim 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Changing climate could be effect on the growth of soybean and seed yield, so we evaluated newly developed soy cultivars in the point of the physiological characteristics by changing temperature and light intensity in the phytotron. Two soy cultivars evaluated in three temperature levels (T1, 20/15; T2, 25/20; T3, 30/25oC at day/night) the pot experiment in phytotron between winter and spring in 2006 and spring and summer in 2007. Increased temperature from T1 to T2 and T2 to T3 enhanced crop growth parameters greatly and shortened growth duration and increased seed yield, however, grown in winter and spring enhanced too much plant height, so plant stems were very slim and weak and it resulted in the lodging problem. In this results we can estimate warming in Korean peninsular which might be increase temperature with low light intensity, so plant breeders and physiologists should be develop improved lodging resistance cultivars under low light intensity and high temperature.