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톨루엔을 포함한 유기용제의 직업적 폭로로 인한 신경내분비계 영향
이채언,이종태,정의화,손혜숙,문덕환,전진호,강정학,이창희,김휘동,김종한,정귀옥 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.2
Long term occupational exposure to solvent mixtures may cause adverse effects to the central nervous system with neurobehavioral symptoms. And some organic slovents have been suggested to cause impairment of tuberoinfundibular dopaminergic activity and neurochemical mechanisms controlling pituitary secretion. For the purpose of assessing neuroendocrine effects in occupational solvents exposure, hormonal study settings (shoes-manufacturing industry & fishing products industry) and compared with nonexposed controls(33 men, 85 women). Male workers exposed to solvent mixtures had significantly lower plasma level of follicle-stimulating hormone(FSH) than nonexposed male controls. While female workers exposed to solvent mixtures had significantly lower plasma levels of growth hormone(GH), and thyroid-stimulating hormone(TSH) than nonexposed female controls. The results of significant decrease in plasma concentrations of pituitary hormones(FSH, GH, and TSH) in workers exposed solvent mixtures indicate that occupational exposure to solvent mixtures may induce neuroendocrine effects through an effect on hypothalamic pituitary axis.
스포츠전문채널 방송3사 프로야구 해설자의 공신력이 채널만족 및 채널충성도에 미치는 영향
김종훈 ( Jong Hoon Kim ),이정학 ( Jeoung Hak Lee ) 한국스포츠산업경영학회 2011 한국스포츠산업경영학회지 Vol.16 No.5
This study aims to furnish the basic empirical data to differentiate image of professional sports channels of broadcasting stations through more efficient operation strategies image managing plan, and the operation of the communication media of the broadcasting stations by looking through the relationship between the credibility of professional sports channels of three broadcasting stations, channel satisfaction and loyalty. The study conducted a research survey through convenience sampling method aimed at college students n Seoul and Gyeonggi area, who currently are the media receivers. Total of 424 copies were selected as the final validity sample. For the measuring instrument, precedent studies of Kim Hyun-Joo(1998), Kim Eun-Sung(2003), Kim Soo-Kyung(2005), Lee Jeoung-Hak, Kim Jong-Hoon & Noh Jae-Hun(2007), Park Ran Hee(2008), Jo Gun Jin(1998) were used and reconstructed according to this research. The research target scope was limited to professional sports channel casters, MBC SPORTS+(Hu Goo-Youn), KBSN Sports(Ha Il-Sung), SBS ESPN(Park No-Jun) who are the commentators of the professional sports channels of three broadcasting stations. The result of the study showed there were significant differences between the sub-factors of commentators`` credibility, ``expertise``, ``trustworthiness``, ``popularity``, ``dynamic`` and professional sports channels of three broadcasting stations. And ``expertise``, ``trustworthiness`` sub factors influenced significantly on it. On the basis of the results, professional baseball casters with more professionalism and trustworthiness are needed in able to gain more credibility from the public.
뭉툭맵시벌아과(벌목:맵시벌과)의 분류와 계통 : Ⅰ. 현상학적 분석 Ⅰ. Phenetic analysis
이종욱,차진열,박원학 嶺南大學校 基礎科學硏究所 1995 基礎科學硏究 Vol.15 No.-
For the phenetic analysis of the subfamily Tryphoninae(Hymenoptera:Ichneumonidae), specimens were collected from March of 1988 to September of 1995 in the southem part of Korean peninsula. Specimens were also obtained from various museums and laboratories both in Korea and other counteries. This research utilized about 1000 domestic specimens and 3010 foregin specimens including 10 specimens from North Korea. Phenetic analysis was performed using these specimens (39 genera 39 species)and the following results were obtained. In the cluster analysis, the ward method is more effective than the average linkage method (within group and between group), while the use of total characteristics was resulted in more stable grouping than only quantitative or qualitative characteristics. The cluster and discriminant analyses suggested that the Townes(1969) and Townes et al.(1992)'s system is well fit for the classification of Tryphoninae. For the subfamiliar classification, the analyses of total characteristics by ward method resulted in the most accetable grouping.
李學沂,曺燦湜,金宇鍾,禹海允 慶北大學校 1990 論文集 Vol.50 No.-
The majority of carbenes add to olefins to give cyclopropanes. In this study, 2-diazo-1,3-indandione, 2-diazo-1-indanone, and 3-diazooxindole were used as carbene precursors. Irradiation of these diazo compounds with trichloroethylene, acrylonitrile, cyclohexene, and cyclooctene was investigated. The addition of carbenes to benzene generally affords norcaradiene or cycloheptatriene or both. Irradiation of 2-diazo-1,3-indandione with benzene gave only cycloheptatriene derivative in 24% yield. But irradiation of 2-diazo-1-indanone with benzene gave norcardiene in equiribrium with cycloheptatriene derivative in 24% yield.
고성토의 암성토에 대한 흙의 함유율이 다짐에 미치는 효과에 관한 실험적 연구
이종출,이영대,정진호,류재학,정두회 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1
We have carried out the field compaction tests in the site in which the high rock fill embankments are going to be constructed about 25m in height, to examine the effect of the soil fraction to the total embankment materials which are the mixture of rock fills and soils on the degree of field compaction. We have made four sets of in-situ concrete boxes of the size of 1.5m×1.5m×0.6m to obtain the maximum dry density of total embankment materials after compacting by using a 10-ton vibrating tamping roller. We have found, as a result, that the optimum passing number of the roller to yield the 90% of relative compaction economically attainable has appeared to be 8 passes, and that the percent of the soil fraction to the total embankment materials to yield the 90% of relative compation in the field has appeared to be 41.78% by weight.
주령구(14면체 주사위)를 활용한 초등수학 영재 교육 자료의 개발
이종학 大邱敎育大學 科學敎育硏究所 2016 과학·수학교육연구 Vol.39 No.-
본 연구는 수학사적인 소재인 주령구를 활용하여 초등 수학영재들을 위한 교육 자료를 개발하였다. 이에 따른 본 연구의 결과는 다음과 같다. 먼저 초등 영재교육에서 다룰 수 있는 수준 에서 주령구의 각 면이 나올 확률을 수학적으로 계산한 몇몇 연구자들의 사례를 살펴보았다. 그리고 이를 기반으로 수학영재들의 동기를 유발하고 실생활과 밀접한 수학사를 중심으로 한 영재 수학영재 교육 자료를 구안하였다.
精密測定 計器用 Stainless Steel의 加工과 熱處理에 따른 諸性質의 變化
李宗炫,安辛根,金學信 全北大學校 1988 論文集 Vol.30 No.-
In order to study the change of properties in Fe-13.3% Cr-0.37%C martensitic stainless steel for precision measuring gauge with the various heat treatments and plastic working, the change of micostructure, hardness and wear resistance were investigated. The results obtained in this experiment are as follows: 1. The high Cr alloy of 13% Cr martensitic stainless steel has selfhardening property which is not remarkably affected by the cooling rate, and also the hardness of this alloy was the highest value in the case of oil quenching after austenitized at 1000℃ for 1/3 hour. 2. The hardness and the corrosion resistance of low temperature tempering treatment are superior to high temperature tempering, especially the hardness of 200℃×2hr tempering treatment are superior to high temperature tempering, especially the hardness of 200℃×2hr tempering treatment in the case of air cooling after austenitized at 1050℃ for 1/3 hour is excellent. 3. The amount of retained austenite hardly existed in the case of air cooling after austenitized at 1000℃ for 1/3 hour, and the increase of hardeness with subzero-treatment is very small. 4. The property of hot working is good but the property of cold working is poor. And then, the secondary hardening with reheating treatment appeared at 400~450℃. 5. Bainite trasformation was occurred in the isothermal heat treatment, and the hardness and the wear resistnace of marquenching treatment are higher than martempering treatment. 6. The elevation of the wear resistance is proportional to the increase of the hardness obtained from the various heat treatments, especially the wear resistance of 200℃×2hr tempering treatment after air cooling is effective than after oil quenching and the wear mechanism is mainly a grinding abrasion.
iPhone을 이용한 실시간 부산 버스도착 안내시스템 설계 및 구현
이학수,최희종,김진일 東義大學校産業技術開發硏究所 2011 産業技術硏究誌 Vol.25 No.-
일상생활에서 가장 밀접하게 이용하는 버스 승차에 대한 불편함을 줄이고자 최근 주목 받고 있는 iPhone을 기반으로 부산 버스도착 안내시스템 설계하고 구현하였다. 본 시스템은 인터넷에 접속하여 검색할 필요 없이 응용프로그램에서 사용자가 원하는 정보를 제공하고, 사용자 편의 기능을 구현한 활용 가능한 실시간 부산 버스도착 안내시스템이다. 개발결과는 iPhone에 장착하여 사용할 수 있도록 앱스토어에 업로드하였다.