시멘트 종류별 콘크리트의 적산온도에 의한 강도예측에 관한 연구

장종호,나철성,김재환,김용로,길배수,남재현,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

The purpose of this study is to exhibit fundamental data which can apply to quality and process management of structure concrete using special cement in the construction field investigating strength prediction by maturity method of concrete according to cement types. The activation energy value was derived from the experimental study that experimental factors were selected as W/C ratio of 45%, the kinds of cements of 3 levels of O.P.C, H.B.C, H.S.C and curing temperature of 3 levels of 5℃, 20℃, 35℃. Also, after investigating relationship between compression strength and equivalent ages of concrete according to cement types, the strength prediction was investigated by maturity method. As the above of results, differences between the prediction strength by strength prediction equation and the actual measurement strength were lower, therefore it is considered that the strength prediction by maturity method is possible not only concrete using normal portland cement but also concrete using special cement.

접형동, 뇌하수체병변 수술을 위한 경비중격접형동 접근법에 대한 연구

장철호,송영창,곽기용 圓光大學校 醫科學硏究所 1996 圓光醫科學 Vol.12 No.1

Early attempts to remove pituitary tumors included a transcranial approach that was impeded by numerous anatomic obstacles like the cavernous sinus, the carotid artery, and the optic chiasm. Nearly every pituitary tumor can be exposed and removed through the nasal septum. Advances in physics and biochemistry have supported substantial improvements in diagnosis and management so that transseptal transsphenoidal approach is one of the most predictable operations performed for pituitary tumor. The sublabial transseptal approach(Hardy) should access to the septal spaces and the sphenoid sinus, working entirely under the lip. However, working into the nose from a low angle under the canopy of the orbicularis oris muscle does restrict visibility at the point surgeon needs it most, over the premaxillar wings. In 1990, we began performing the entire septal dissection through a septal hemitransfixation incision, saving the sublabial incision until later in the operation when we wanted to insert the nasal speculum. This modified approach improved our ability to elevate the mucoperichondrium from the anterior-inferior regions of the septum in the premaxillary region without perforation. The nasal spine ceased to be an issue because it was no longer in the way. We studied 10 cases of modified transseptal transsphenoidal approach to pituitary tumor and other lesions during a period of 6 years between September. 1990 and October, 1996.

자동차 관련직종 근로자의 근골격계 증상 호소율에 관한 연구

이용진,장은철 순천향의학연구소 2007 Journal of Soonchunhyang Medical Science Vol.13 No.2

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ATM망에서 실시간 연결수락제어에 관한 연구

장혁,김영훈,김용수,김희철,나상동 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1

본 논문은 이질적 버스트 트래픽을 갖는 ATM(Asynchronous Transfer Mode) 망에서 실시간 연결 수락 제어를 위한 유체 흐름 모델(fluid flow model)에 기반을 둔 실시간 알고리즘을 제안한다. 셀 손실 확률은 QOS(Quality of Service)의 기준이 되므로 제안된 실시간 알고리즘은 일정한 메모리 크기와 연결 요청의 수락 여부 즉, 연결 수락 여부의 결정을 위한 하나의 영역을 필요로 한다. 이러한 트래픽 소스 각 타입에 대한 셀 손실 확률은 트래픽 소스 타입 전체에 하나만 존재하더라도 요구를 충족 시킬 수 없으므로, 본 논문에서 제안된 실시간 알고리즘에 의해 산출되는 각각의 셀 손실확률에 충분한 상한선을 제공하는 전형적 트래픽 매개변수를 사용하여 성능을 분석한다.

partial pulpotomy를 이용한 미성숙 영구치의 치수 치료: 증례 보고

장기택,노승철,한세현,김정욱,김용수 大韓小兒齒科學會 1999 大韓小兒齒科學會誌 Vol.26 No.4

치수치료의 주요한 목적은 구강조직의 본래의 건강을 유지하는 것이며, 치수치료 시 가장 중요하고 어려운 점은 치수조직의 건강상태 또는 염증의 정도를 결정함으로써 최선의 치료방법을 결정하는 것이다. 미성숙 영구치는 풍부한 혈류 공급으로 다양한 손상에 성공적으로 반응하게끔 치수의 능력을 향상시킴으로써 많은 치수치료 술식을 위한 좋은 조건을 가지고 있다. 기저재(base) 또는 이장재(liner), 간접 치수복조술, 직접 치수복조술, 그리고 치경부 치수절단술을 포함한 여러 종류의 보존적인 치수치료가 미성숙 영구치를 위해 추천되어 왔다. 근래에는 외상으로 인하여 치수노출된 영구절치를 치료하는데 있어 주로 제시된 부분 치수절단술(partial pulpotomy)이 우식으로 인해 치수노출된 영구대구치를 치료하는 또다른 술식으로 제안되고 있다. 부분 치수절단술 후 치아가 다음의 criteria를 만족시킬 때 치유가 되었다고 결론지었다. 1. 임상적 무증상 2. dentin bridge 형성의 방사선학적 증거 3. 방사선상에 치수내 또는 치근단 병소가 없다는 증거 4. 지속적인 치근 발육과 미성숙 치아의 치근첨 형성 5. 성숙된 치아에서 정상적인 상아질의 축적 6. 전기치수검사에서 양성 반응 이에 저자는 미성숙 영구치에서 우식 또는 외상으로 인한 치수노출시 부분 치수절단술을 행하여 양호한 결과를 얻었기에 이를 보고하는 바이다. The primary objective of pulp treatment is to maintain the integrity and health of the oral tissues. The most important and difficult aspect of pulp therapy is determining the health of the pulp, or its stage of inflammation, so that a decision can be made regarding the best form of treatment. Immature permanent teeth are good candidates for many pulp healing procedures, due to their rich blood supply, which is believed to enhance the pulp's ability to react successfully to various insults. Healing was considered to have taken place when the tooth fulfilled the following criteria: 1. Abscence of clinical symtoms 2. Radiographic evidence of dentin bridge formation 3. No intrapulpal or periapical pathosis was evident radiographically 4. Continued root development and closure of the apex in immature teeth 5. Normal dentin apposition in mature teeth 6. Positive response to electrical pulp test This presents a report of cases in which immature permanent teeth, pulp-exposed by caries or trauma, was treated successfully by partial pulpotomy

이산화된 탐색공간에서 다구찌 방법을 이용한 구조 최적설계에 관한 연구

장성현,정우영,정용민,권봉철,최영휴 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

Nowadays, there are several design problem having discrete variables in the industrial fields. The researchers are using the optimization method, such as genetic algorithm (GA), simulated annealing (SA), design of experiment (DOE) and taguchi method (TM), to solve it's design problem. Moreover, people want to decrease the computational cost and time. Therefore, in this paper, we proposed the iterative optimization algorithm which repetitively searched a local region to find best solution in discrete searching space using TM. The optimal solution in each local region is obtained by S/N ratio for the evaluation function that consists of the objective function and penalty function. Also, we have applied our algorithm to 3-bar, 10-bar, and 25-bar truss optimization problem.

백서 하악골의 기능적 전방위가 악관절 원판에 미치는 영향

배용철,경희문,장병천,성재현 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.4

This study was conducted to examine the changes in the shape of the Sprague-Dawley rats' articular disk following postural hyperpropulsion by observing their articular specimens through light and electronic microscopes after following 2-week and 4-week postural hyperpropulsion from their four weeks of age. The findings of this study are summarized as follow. It was shown that as compared with the control group, the experimental group indicated a significant increase in thickness of the 2-week groups' anterior and posterior portion of the articular disc. The experimental group showed statistically more significant increase in thickness of the 4-week groups' anterior portion of the articular disc than the control group. Light micrograph showed that the experimental group had more fibroblast in the anterior portion of the 2-week and 4-week groups than the comparing group. The 2-week groups showed in the findings through the electronic microscope that there were found the well developed and dilated RER which see-ms to actively synthesize the extracellular matrix including collagen, the cells with the well developed RER without distention which seems to actively synthesize the intracellular microfilaments due to the well developed free ribosome, and the typical chondroid cells. In addition, there was more fibroblast cell with the distended and well developed RER in the anterior area of the experimental group than that of the control group while fibroblast with the well developed RER and free ribosome was quite abundat. Based on the above result of this study, it was shown that the functional hyperpropulsion of the mandible causes the changes in the nature of the mechanical load to the certain portion of the articular disk. As a result, it seems that there may be occurred some changes in morphology of the disc by adaptation or confrontation with these changes at the cellular level.

소음 작업장에서 근무하는 청력이상자들의 개인 보호구 착용 및 관련 요인

장은철,이용진 순천향의학연구소 2007 Journal of Soonchunhyang Medical Science Vol.13 No.1

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단기반응성 정신병 환자와 정신분열증 환자의 임상적 비교연구

김철주,장무성,엄용섭 大韓神經精神醫學會 1989 신경정신의학 Vol.28 No.1

To compare the clinical characteristics of brief reactive psychosis with those of schizophrenia, the authors selected 50 patients of brief reactive psychosis meeting with DSM-Ⅲ criteria and 50 patients of schizophrenia meeting with both DSM-Ⅲ and RDC criteria. All patients were admitted to the psychiatric ward of Pusan Paik Hospital from Apr. 1, 1984 to Mar- 31, 1987 The results obtained from this retrospective study were as fellows: 1) Brief reactive psychosis was apparently more common in women(74%) and usually appeared In early adulthood, but had more wider age distribution than schizophrenia. 2) Although their educational levels were lower than that of schizophrenics, the patients of brief reactive psychosis showed better marital and premorbid adjustment than the schizophrenics. 3) In brief reactive psychosis, the premorbid personality was more variable than in schizophrenics and the most vulnerable personality was hystrionic(22%) and dependent(18%). 4) The major psychosocial factors predisposed to the development of brief reactive psychosis were marital or financial crisis(26% ), death or separation(72% ), academic or occupational problems(16%) and health problems(12% ) in order of frequency. 5) On admission, insomnia(92%), emotional turmoil(82%) and hallucination(66%) were more frequent in the patients of brief reactive psychosis than in the patients of schizophrenia. Although the Schneider's first rank symptoms were less frequent in the former, it was surprising that they were present in 32% of them. 6) Almost all of the patients with visual hallucination were reactive psychotic patients and 64% of the hallucinatory Images of them were the deads or ghosts. 7) During the course of admission, the majority(60% ) of the patients of brief reactive psychosis were treated with daily dosage under 200mg of chlorpromazine equivalent.

일부 소규모 사업장 근로자들의 개인 보호구 착용에 관련된 요인

김용규,김현주,이수진,장은철,노상철,송재철 大韓産業醫學會 2002 대한직업환경의학회지 Vol.14 No.3

목적 : 상시근로자 50인 미만의 소규모 사업장 근로자들의 개인 보호구 착용과 관련된 요인을 조사하고자 하였다. 방법 : 1998년 소규모 사업장 보건관리 기술지원 사업장 근로자 230명을 대상으로 설문조사와 함께 작업환경측정 및 특수 건강진단 결과를 검토하였고, 개인 보호구 착용에 영향을 미치는 요인을 분석하기 위하여 Precede-Proceed 모형을 적용하였다. 결과 : 연구대상은 주로 남자(97 %), 기혼(64.8 %), 고졸 이상(77.8 %)이었고, 연령은 평균 34.8±8.3세였다. 종사 업종은 인쇄업 46.1 %, 자동차 수리업 53.9 %이었고, 동일업종 근무기간은 평균 11.9±7.2년이었다. 개인 보호구의 종류별 착용률은 유기용제용 마스크 32.7 %(35명), 방진마스크 43.9 %(101명), 청력보호구 44.3%(102명)이었고, 이중 하나 이상의 개인 보호구 착용자율 64.3 %(148명)이었다. 개인보호구 착용에 영향을 미치는 요인에 관한 다변량 분석 결과 '유해인자의 건강영향에 대한 지식수준'이 높음(OR=2.34), '개인 보호구의 예방 가치'에 대한 인식이 높음(OR=3.46), '사회적 지지'가 높음(OR=2.78), '지속적인 노출특성을 갖는 직업 공정' (OR=2.18-4.47), 소득수준이 높음(OR=7.64) 등이 유의한 관련요인으로 나타났다. 결론 : 근로자 수 50인 미만 소규모 사업장의 개인보호구 착용률은 중,대규모(50인 이상)의 사업장을 대상으로 한 연구 결과에 비해 저조한 편이며, 그착용률을 높이기 위해서는 경향요인 뿐 아니라 강화용인, 가용요인, 환경요인에 대한 개입이 이루어져야 할 것으로 생각한다. Objective: The aim of this study was to identify the factors associated with the wearing of Personal Protective Equipment (PPE) in small scale industries. Methods: In a cross-sectional study, the data were obtained from self-administered questionnaires, a special health examination and the industrial hygiene records. The study included 230 workers in small-scale industries (the print industry and automobile repair shops), which were provided with a subsidiary occupational health program funded by government in 1998. The authors used the Precede-Proceed model. Results: Among the subjects who were recommended to wear a PPE, 32.7% (35/107) wore the gas/vapor respirators, 43.9% (101/230) wore the particulate respirators, and 44.3% (102/230) wore hearing aids. Among them, 64.3% (148/230) wore one of the above PPE. The wearing of PPE wearing was associated with knowledge (OR=2.34), the value of prevention (OR=3.46), social support (OR=2.78), the type of task (OR=2.18-4.47), and income level (OR=7.64). Conclusions: In small scale industries, the proportion workers wearing PPE was low. To increase this proportion, the reinforcing, enabling, and environmental factors as well as the predisposing factors need to be modified.