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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.
이창엽,조평곤,김지닐,최소영,김창균,최종학,김정민,김유현 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.2
To find elements which enable improving Quality of image of chest radiography, we attempted to make comparison between chest radiography used currently with that of the past, and following conclusion was reached: 1) It could be confirmed that a dependance on chest radiography was declining, because proportion of chest radiography against overall radiography decreased. 2) There was a change of kVp to a high voltage in a chest radiography, and use of high kVp became a generalization 3) Exposure time was reduced and exposure dose was curtailed accordingly. 4) Apparatus was mainly comprised of 3-phase rectifier circuit and inverter type. 5) It could be confirmed that frequency of applying additional filters for high kVp radiography was insufficient. 6) There was almost no difference in the condition of exposure between hospitals using film/screen and hospitals using CR. But when CR is used for radiography, it was increase in exposure dose due to increase in tube current and it will be necessary to have continuous study on exposure dose by an increase use of CR in the future.
학교 수학의 통계 영역에서 인지적․정의적 능력에 대한 연구
이종학 大邱敎育大學校 科學敎育硏究所 2021 과학·수학교육연구 Vol.44 No.-
During recent years, statistics has become an important area of mathematics education which be include in all levels of school. The purpose of the study was to explore the redefining on statistical thinking for improving statistics education at school mathematics. For this purpose, the researcher examined the relationship between mathematical thinking and statistical thinking. the researcher explained a statistical reasoning and statistical attitude. As result, this study presented proper direction for the improvement of statistics education in school mathematics. 통계학은 수학을 통해 기초가 구성되고 발전했지만, 근본적으로 수학과는 별도로 20세기 이 후에 새로운 학문 분야로 확립된 경험과학 체계이다. 따라서 학교 수학에서 다루는 통계 영역 은 다른 수학 분야와 구별되는 본연의 특성을 지닌다. 수학적 사고가 내용에 대한 연역적 전개 에 기반하여 탈맥락적인 추상화 과정을 주요한 성격으로 한다면, 통계 목적에 부합하도록 임 의 추출한 자료를 기반으로 하는 통계적 사고는 추출된 자료의 현실적 맥락을 중요시하며, 실 제 자료에 대한 귀납적 사고를 주요한 사고의 특징으로 한다. 본 연구에서는 교실 수업에서 통계적 사고를 함양하고, 긍정적인 통계적 태도를 기를 수 있 는 이론적 토대를 마련하고자 학교 수학에서 요구하는 통계적 능력으로 인지적 영역에서 통계 적 사고와 통계적 추론, 그리고 정의적 영역인 통계적 태도에 대해서 알아보았다.
冠岳樹木園地域內 荒廢山地土壤의 肥沃化를 통한 綠化促進에 關한 硏究
李宗學,麻鎬燮,李憲浩,權台鎬,禹保命 서울大學校 農科大學 1984 서울대농학연구지 Vol.9 No.2
冠岳樹木園地域의 山復斜面은 地質的으로 대보화강암에서 풍화생성된 거친 돌부수러기가 많은 粗砂質壤土로 구성되었으므로 表土層의 土壤流矢이 심하여 土深이 대단히 얕거나 岩盤露出이 심하여 林木生長이 심히 不良한 地帶로서, 山地의 地力恢復 및 現存하는 散生樹木의 生長力恢復을 通한 山地綠化保全이 시급히 요청되고 있다. 이와같은 요청에 부응하여 荒廢地斜面에 自生하고 있는 주요한 4樹種(소나무, 리기다소나무, 노간주나무, 철쭉)에 대하여 山地施肥效果 試驗을 春期와 秋期로 나누어 실시한 결과 樹高 및 直徑生長量에 있어서 無施肥區에 比하여 현저한 施肥效果가 인정되었다. 따라서 冠岳山地帶의 荒廢地를 조속히 復舊綠化하기 위해서는 砂防土木的 工事方法 및 砂方造林的 播植方法이외에도 현존 수목의 保全 및 生長力恢復을 통한 速成綠化方法도 채용되어야 할 것이다. Hillsides in the Kwanak arboretum area were composed mainly of coarse sandy loam having relatively high proportion of rough weathered debris derived from the Daebo granite geologically. Owing to heavy soil erosion resulted to shallow soil depth and heavy rock exposures, the growing trees in this type of surface soil are very poor in their growth. For woody plant vegetation establishment in this montain area, it is urgent to recover the fertility of soil and the growth of existing trees. For this purpose, in spring and autumn season in 1983~84 the fertilization experiment was conducted with the 4 principal native species(Pinus densifltora, Pinus rigida, Juniperus rigida, Rhododendron schlippenbachii) growing in this denuded forest land, and the effects of fertilized tree plots were more prominent than the control plot in both height and root-collar diameter growth. Therefore, the accelerating measures of vegetation rehabilitation through conservation of existing trees and recovery of tree growth by forest fertilization practices, besides forest engineering measur es and soil erosion control afforestation measures, could be acceptable as the measures for the recovery of denuded forest land in Mt. Kwanak area.
이상용,박익근,윤종학,노승남,안형근 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
A new flaw detection technique using by SH angle beam method has been discussed. The SH-wave is horizontally polarized shear wave and the surface SH wave has a characteristic of traveling along near surface layer. The surface SH wave technique is valuable for the detection of fatigue cracks at fillet weld heels which cannot be detected by other ultrasonic technique such as angle beam technique and The dispersion curves of it has simple characterization. In this work, using these beneficial chraterization, quality evaluation of spot weld with ultrasonic sound intensity of SH-wave passing through nugget area of spot weld are verified experimentally.