Trephthalic Acid 반응기의 정성적 위험성 분석에 관한 연구

전종한 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.1

Safety concern on chemical prcessing plants have been rapidly increased as the size of plants became bigger and more complex. In this study, a purified TPA(Terephthalic acid) reactor is selected. Since the oxidation of p-Xylene which is one of the most hazardous reactor is processed in it. The qualitative risk assessment of TPA reactor with HAZOP(Hazard operability study) is mainly examined. Several necessary modifications on the design of the reactor such as installation of an additional flow trasducer(FT) on the air inlet pipe, of an N_2 line to TPA reactor, of an additional FT of p-Xylene and of an interlock with LAHH(Level alarm high high) are identified after analyzing the reactor by HAZOP.

한국인의 아포지단백 E 유전형과 혈청 지질 성분과의 관련성

전사일,김종원,송정한,김진규 대한임상병리학회 1996 대한임상병리학회지 Vol.16 No.5

냉장고용 폴리우레탄 발포체의 재활용에 관한 연구

전종한,신성희 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.1

The recycled polyols by the depolymerization of the waste PU foam for refrigerator insulation obtained. The depolymerization was experimented with glycols such as EG and PG. The rigid PU foams were manufactured by Polyols of both virgin and recycled polyols at various mixing ratios and their properties were characterized. Faster reactivity in the synthesis of PU foam was shown with increasing contents of the recycled polyol in the mixed Polyols. The thermal insulation of PU foams by mixed polyols of virgin/recycled polyols was increased but the compession strength was slightly decreased.

폴리카본산계 유동화 혼화제 개발

전용진,조석형,홍영호,한종필 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-

폴리카본산계 기능성 고분자를 합성해서 고성능 감수제 원료로 활용하여 고유동화 혼화제를 개발하고자 한다.폴리카본산계 기능성 고분자를 합성한 후, 이를 고유동, 고강도 혼화제 원료로의 제반 물성을 확인하고, 이를 현장에 적용하여 현재의 제품을 획기적으로 개선하고, 혼화제 품질의 우위성을 확보하기 위해 1)시멘트 및 골재 표면에서의 적절한 계면활성을 갖는 분자설계를 하였으며, 2)분자량의 조절 기술의개발를 개발하였다. 합성에 있어서 첫째, 시멘트 및 골재 표면에서의 적절한 계면활성을 갖는 분자설계와 둘째, Mw 5,000정도의 분자량을 갖는 감수제의 합성기술을 개발하였다.이렇게 제조된 고성능 유동화제의 화학구조 해석를 해석하고 분자량 및 분자량 분포를 측정한 다음, 시멘트 페이스트의 유동성, 점도, 슬럼프로스 등을 측정하여 고성능 유동화제의 성능인 시멘트 페이스트의 유동성을 시험하였다.그 결과 고유동성을 갖는 것과 장시간 안정한 유동성을 나타내었으며, 경과 시간에 따른 겉보기 점도변화를 측정한 결과 점도의 상승이 초기에 일어나다가 시간의 경과에 따라 점도가 감소하는 경향을 나타내었다.따라서 경과시간에 따른 유동성손실을 억제할 것으로 기대한다.

콘크리트 구조물용 GFRP리바의 기계적 특성에 관한 연구

한길영,이동기,김성용,전상기,최종대,박준식 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2

In this paper was studied on the mechanical characteristics of Glass Fiber Reinforced Plastics(GFRP) of the steel bar it is to replace The advantage of FRP such as high strength low weight and chemical inertness or noncorrosiveness can be fully exploited. GFRP bar were successfully fabricated at 10mm nominal diameters and hollow types using a pultrusion method Tensile and bending specimens from this bar were tested and compared with behavior of GFRP rebar and steel bar.

카리스마적 리더십에 관한 연구

박종태,최영곤,한남익,박철용,표내숙,조춘호 釜山大學校 附設 體育科學硏究所 1998 體育科學硏究所 論文集 Vol.14 No.-

In the early decades of this century, Charisma which originally means endowment with the gift of grace, has been introduced to social sciences by German sociologist, Max Weber. It quickly became interested in the field of sociology and politics. But, into the 1970s, charismatic leadership still had not became a subject for empirical or experimental research related to organizational theory. Recently, much attention has been paid to charismatic leadership as the prototype of leadership that people have in mind when they describe their ideal leader and is more likely to provide a role model with which subordinates want to identify. As a result, in will perform further study related to Charisma leadership which developing various kind of measurement and instrument. Finally, it should identify lost of possibility and phenomenon through the study of charisma leadership.

서울지역 대기오염이 호흡기계질환 수진건수에 미치는 단기영향에 관한 연구

임종한,이종태,김동기,신동천,노재훈 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.3

Several studies have reported the associations between airborne particles and/or ozone and respiratory diseases. This study examined whether such an association could be seen in Seoul, one of the greatest city in Korea. We compiled daily records of hospital visits in Seoul from November 1, 1995 to October 31, 1996. The daily averages of ozone and particle matter whose diameter is 10 ㎛ or less(PM10) from all monitoring stations were computed. Daily respiratory hospital visits were regressed on temperature, humidity, day of weak indicators, seasonal variation indicators, and air pollution. Each pollutant was first examined individually and then two pollutant models were fitted. Results : Both PM10 and Ozone were associated with increased risk of respiratory hospital visits. The relative risk of respiratory hospital visits for 50 ㎍/㎥ increase in PM10(lagged 2 days) was 1.11(95% confidence interval: 1.05-1.18). The PM10 associations was insensitive to alternative methods control for weather, including exclusion of extreme temperature days and control for temperature on another day. The ozone results were more sensitive to the approach for weather control. The relative risk of respiratory hospital visits for 0.01 ppm increase in O₃was 1.08(95% confidence interval 1.00-1.17). The magnitude of the PM10 effect in Seoul, where SO₂was essential present, was similar to that reported in the Europe and United states. In conclusion, The consistency of investigations of the health effects of air pollution suggest that attention should be paid to the control of air pollution.

토끼의 만성 뇌혈관연축 모델에서 혈관확장제에 의한 비가역적 혈관수축의 발현시기와 혈관벽의 전자현미경소견상 이상소견이 발현되는 시기와의 시간관계

정천기,조병규,김하영,지제근,김종재,한대희 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.11

One of the characteristics of the cerebral vasospasm is its irreversibility with the vasodilators.Under the hypothesis that the irreversibility with vasodilators might be caused by the structural change in the arterial wall, authors examined the chronological relationships between the irreversibility and the electron microscopic findings of the arterial wall in the rabbit chronic vasospasm model. The development of the vasospasm and the irreversibility of the vasospasm with the intra-arterial papaverine were defined angiographically. After the second angiography done in one to 30 days after subarachnoid hemorrhage(SAH), eighteen rabbits were sacrificed, and the basilar artery was examined with electron microscope. Arterial narrowing was the severest one day after SAH(54.1% of the pre-SAH diameter), and was maintained up to 30 days afer SAH. The irreversibility of the arterial constriction with the papaverine developed 5 days after SAH, which had a tendency to recover 6 to 9 days after SAH. However the irreversibility was noted again 16 days after SAH. Electron microscopy revealed the endothelial wrinkling, disorganization of muscle fiber, myonecrosis, thickening of smooth muscle fibers, and increase of connective tissue in the tunica media. These structural changes were severest one day after SAH, and gradually diminished up to 30 days after SAH. These data show that there are no chronological relationships between the irreversibility and the structural change per se. However the fact that the irreversibility developed during the reparative phase of the arterial wall injury by SAH suggests that the chronic vasospasm is not a primary event but a secondary phenomenon following an injury to the cerebral arterial wall.

춘천시의 지하 저장 탱크의 예비적 위해성 평가를 위한 설치 현황 분석 및 지리정보시스템의 적용

김준현,한영한,이종춘,권영성,이광연 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

In this study, the preliminary risk assessment for the underground storage tanks(UST) in Chunchon city was implemented using the geographical information system(GIS). The estimation variables, such as the installation year, storage capacity, the distances from streams, and from groundwater pumping wells, were selected to estimate the relative risk levels. The weighting factors were given to all the estimation variables. Cumulative scores were induced by the combination of al1 the scores of the corresponding variables using the buffering technique and the overlay analysis in ArcView. Using the these process, the relative risk level of each UST was estimated. Some sites in this study are simplified and reduced because the number of useable data are limited or too enormous. Thus the selection of the comprehensive estimation variables and the proper weighting values are required for the future study. The methodology in this study could be served not only for the preliminary risk assessment of UST but also for the selection of the proper location of new and old UST. And, it can be used for the effective management system of UST.

대퇴 골두 골내 결절종 : 증례 보고 A Case Report

임수재,천동일,우승한,임강철,박종석,이병일 대한고관절학회 2004 Hip and Pelvis Vol.16 No.1