심혈관계 질환으로 관상질환 집중치료실에 입원한 환자들의 혜후 측정을 위한 APACHEⅢ점수 체계의 임상적 유용성

이공섭,이창선,최현주,홍종서,강지향,김도형,이민영,오인균,김병엽,김상억,김학찬,한승혜,이재용,지영우,안경주 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.8

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.

객체지향 데이타베이스의 중포속성에 대한 다차원 색인기법

이종학 대구효성가톨릭대학교 1998 연구논문집 Vol.58 No.2

This paper proposes multidimensional indexing techniques for nested attributes in object- oriented databases. We use a multidimensional dynamic file organization for these indexing techniques. Since most conventional indexing techniques for object-oriented databases use a one-dimensional index structure such as the B+-tree, they do not often handle complex queries involving both nested attributes and class hierarchies. We extend a tunable two-dimensional class hierarchy indexing technique for nested attributes in object-oriented databases. The tunable two-dimensional class hierarchy index is an indexing scheme that deals with the problem of clustering objects in a two-dimensional domain space that consists of a key attribute domain and a class identified domain for a simple attribute in a class hierarchy. In our extended scheme, we construct indexes using multidimensional file organizations that include one class identifier domain per class hierarchy on a path expression that defines the indexed nested attribute. This scheme supports efficiently queries that involve search conditions on the nested attribute represented by an extended path expression. An extended path expression is a one in which a class hierarchy can be substituted by an individual class or a subclass hierarchy in the class hierarchy.

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.

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,權台鎬,李憲浩,禹保命 서울大學校農業生命科學大學附屬樹木園 1984 서울大學校 樹木園 硏究報告 Vol.- No.5

冠岳樹木園地域의 山腹斜面은 地質的으로 대보화강암에서 풍화생성된 거친 돌부수러기가 많은 粗砂質壤土로 구성되었으므로 表土層의 土壤流失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하고있는 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 砂防造林的 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 densiflora, 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.

관상동맥 시술 도중 발생한 좌주간부 관상동맥 박리에 대한 스텐트 삽입 치료의 단장기 임상 결과 : acute and long-term results

이세환,이승환,홍명기,김영학,이철환,한기훈,송종민,강덕현,송재관,김재중,박성욱,박승정 대한내과학회 2004 대한내과학회지 Vol.66 No.6

목적 : 심도자 사용 시술과 관련된 좌주간부 관상동맥박리에 대한 적절한 치료는 아직 확실히 정립되지 않은 상태이다. 이에 본 연구는 좌주간부 관상동맥 박리에 대한 스텐트 삽입술의 단장기 임상결과를 후향적으로 분석하였다. 방법 : 좌주간부 관상동맥 박리에 대한 치료로 즉각적인 스텐트 삽입술을 시행하는 것이 안전하고 효과적인 방법임을 가설하였고, 이러한 즉각적인 스텐트 삽입을 시행한 10명의 환자를 대상으로 단장기적 임상경과를 의무기록 고찰과 전화 면담을 통해서 평가하였다. 결과 : 전체 환자 모두 처음부터 좌주간부 관상동맥에 유의한 협착을 가진 환자는 없었으며, 8명의 환자는 심도자의 조작으로 인한 박리가 발생한 경우였고(진단적 혈관 조영술 중에 3명, 유도 도자 조작 중에 5명), 나머지 2명은 다른 병변에 스텐트 삽입시술을 하는 중에 박리가 발생하였다. 이 10명의 환자에서 모두 즉각적인 스텐트 삽입술이 시행되었고, 4명의 환자에서 시술 도중 혈압 저하로 Intra-aortic Ballon Pump (IABP)를 장착하였다. 모든 환자에서 성공적으로 스텐트가 삽입되었고, 병원내 사망은 1명도 없었다. 6개월 추적 관상동맥 조영술은 8명의 환자에서 시행되었다. 혈관 조영상의 재협착(직경 협착 50% 이상)은 8명 모두에게서 관찰되지 않았으며, 퇴원 후 평균 31±25개월의 추적관찰 결과 주요 심장사건은 1건도 발생하지 않았다. 결론 : 비록 대상 환자가 적은 연구였지만 좌주간부 관상동맥 박리에 대한 스텐트 삽입술은 기술적으로 안전하고 빠르게 시행 할 수 있으며, 훌륭한 단장기적인 치료 효과를 보여준다. Background : The optimal treatment of patients with left main coronary artery (LMCA) dissection during catheter-based procedure remains uncertain. We retrospectively analyzed the acute and long-term results of bail-out stenting for LMCA dissection. Methods : In cases with significant LMCA dissection occurring during catheter-based procedure, prompt stent implantation may be safe and associated with favorable clinical outcome. We evaluated the acute and long-term results of bail-out stenting for LMCA dissection occurring during catheter-bases procedure in 1- patients. Results : Initially, there was significant stenosis of LMCA segment in these patients. Catheter-induced dissection occurred in 8 patients (during diagnostic angiography in 3 patients and guiding catheter manipulation in 5 patients). Two patients suffered dissection in the setting of stent deployment in other vessels. Therefore, bail-out stenting LMCA dissection was performed in a total of 10 patients. In 4 patients, hypotension developed and intra-aortic balloon pump was placed during procedure. Stents were successfully deployed in all patients. There was no in-hospital mortality. Six-month angiographic follow-up was performed in 8 patients. Angiographic restenosis(diameter stenosis 50%) was not observed in all patients at follow-up study. During a mean follow-up of 31±25 months after hospital discharge, there was no major adverse cardiac event (death, myocardial infarction, and target lesion revascularization). Conclusion : Bail-out LMCA stenting is technically feasible, and showed good acute and long-term results in a small series of patients.

중국의 '서부대개발'과 자동차 산업 : 한국에의 시사

이승훈,김광억,이근,은종학 서울대학교 사회과학연구원 2001 한국사회과학 Vol.23 No.2

본고는 중국의 서부대개발 정책의 내용과 향후 전망 및 이 정책이 가지는 중국 자동차 산업에의 시사를 찾고자 하였다. 중국 서부지역의 주민들의 의식이나 인프라 등은 동부 대도시의 80년대 말 상황과 비슷할 정도로 뒤떨어져 있다. 서부대개발이 중국정부의 장기적인 프로젝트인 만큼, 우리도 중국 서부를 장기적으로 인식해 적절한 전략적 접근이 필요하다. 한국의 자동차 산업과 기업이 얻을 수 있는 시사점은, 장기적 비전과 전략적 접근의 필요성 외에 다음과 같은 것들이 있다. 첫째, 같은 서부지역이라도 소득수준과 교통 인프라 차원에서 우수한 몇몇 省·市(중경, 사천, 섬서 등)가 서부지역의 발전을 주도할 것이기 때문에 이들 지역을 통한 단계적 진입 전략이 필요하다. 둘째, 서부대개발에 따른 자동차 수요증가는 차종에 따라 달리 나타날 것이므로 이에 대한 고려가 필요하다. 즉, 화물차에 대한 수요증가는 직접적으로 나타날 것이나, 일반승용차에 대한 수요증가는 간접적이고 또한 그 정도도 제한적일 것이다. 셋째, 중국의 자동차 시장은 지역분할 구도의 약화, 시장경쟁의 격화, 유통구조의 개편, 개인구매의 증가 등의 변화를 겪고 있어, 이 같은 자동차 시장 자체의 역동성에 적절히 대응해야 한다 This paper first discusses the main contents and prospect of the Great West Development project of China and then tries to find implications of this project for automobile makers. First we note that this project spans a very long time horizon and thus the firms should approach this with a long term oriented view, rather than expecting any short term benefits. Also, because the projects, especially during the early stage, will be led by selective fore-running regions, like Chungqing, Sichuan and Shaanxi, the firms should take a differentiated and gradual approach. Expansion of demand for automobiles will be different depending upon the kinds of cars. Initial expansion will be more for trucks whereas demand for passenger cars will be indirect or limited. At the moment, the automobile industry in China is undergoing radical changes in terms of regional distribution of market power among the major makers, ever-increasing market competition, changes in the marketing networks, and increasing participation of individual customers. This kind of industrial dynamism should be fully considered in designing corporate strategy or public policy.

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.

흉부 X선촬영 기술의 변천에 관한 연구

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.