전화번호안내원의 누적외상성 장애

정해관,최병순,김지용,유선희,임현술,김용민,어경윤,권용욱 大韓産業醫學會 1997 대한직업환경의학회지 Vol.9 No.1

To evaluate the prevalence of cumulative trauma disorders in relation to ergonomic evaluation of their work, 260 female directory assistance operators employed in three branch facilities of the nation-wide telecommunication company. Ergonomic evaluation of the work status was done by two industrial hygienists through inspection. Workers were surveyed with standardized self-administered questionnaire and examined by family physicians and an orthopaedician for cumulative trauma disorders. Laboratory examination of serum aspartate aminotransferase(AST), creatinine phosphokinase(CPK), aldolase and rheumatoid factor was done and X-ray of cervical spine and both shoulders was taken from all subjects and nerve conduction velocity test was done on 57 subjects with suspected nerve entrapment cases. Cumulative trauma disorders were categorized into 3 category according to work-relatedness of the disorders. On ergonomic evaluation of the working posture and work environment, improvement of work posture revealed inappropriate postures and devices. Mean age of the subjects were 39 years old and more than 80% graduated high school or above. Ninety-eight percent of the workers employed in the company for more than 15 years and 74.6% of the workers worked at the VDT job for more than 4 years. Mean daily work hours was 8.0 hours per day and mean break hours was 90.5 minutes per day with mean extra work hours of 10.7 hours per month. Mean daily calls were 1128.6 calls in maximum and 864-8 calls in minimum. On laboratory examination, 13.(5.0%) workers had abnormal AST, 53(20.4%) had abnormal CPK, and 1(0.4%) had abnormal aldolase level. On x-ray examination of cervical spine, 111(42.7%) had loss of or reversed normal cervical lordosis, 10(3.8%) had narrowing of intervertebral space. Nerve conduction velocity test was abnormal in 11(19.2%) among 57 workers. Among disorders categorized as work-related, 131(50.4%) were diagnosed to have fatigue myalgia of levator scapulae, 108(41.5%) had cervical strain or sprain, 47(18.1%) had fatigue arthralgia of phalangeal joints, and 47(18.1%) had probable carpal tunnel syndrome, in 10(3.8%) of those diagnosis was confirmed electrophysiologically. Age, seniority, work duration at present job, workload nor location of facilities were associated with the prevalence of symptoms nor specific diagnoses on simple statistical analysis and multiple logistic regression, which seems to be due to highly selected and homogeneous characteristics of the study subjects. Above results shows that cumulative trauma disorders are very prevalent among directory assistance operators and elaborate effort is needed to reduce the cumulative trauma disorders among the operators.

MathCad의 그래픽 기능을 이용한 양자화학 학습 : 수소원자의 3차원 파동함수 그리기

정해영 덕성여자대학교 자연과학연구소 2007 자연과학 논문집 Vol.13 No.-

수학 소프트웨어인 매쓰캐드 13의 3차원 그래픽 기능을 사용하여 수소원자의 3차원 파동함수를 그리는 방법을 고안하였다. 본 논문에서는 임의 파동함수 값에서 2p_(z), 3p_(z), 3d_(xz), 3d_(z^(2))와 4P_(z), 4d_(xz), 4d_(z^(2)) 궤도함수의 3차원 형상을 계산하고 그리는 방법을 프로그래밍하였으며, 이를 통하여 학생들의 양자화학에 대한 이해와 흥미를 높히는 교육적 효과가 있기를 기대하고 있다. Using a 3-dimensional graphic function of MathCad 13, a mathematical software, we devise a technique to draw 3-dimensional wave functions of a hydrogen atom. In this article, we program to calculate and draw 3-dimensional shapes of the orbitals, with arbitrary values, 2p_(z), 3p_(z), 3d_(xz), 3d_(z^(2)), 4p_(z), 4d_(xz) and 4d_(z^(2)). Thus, we expect an educational effect that students have more understanding and interest in quantum chemistry.

무한천과 곡교천의 식생 구조와 관리에 관한 연구

조해용 선문대학교 1998 공과대학논문집 Vol.1 No.1

하천개발이 하천의 생태계에 미치는 영향을 알아보기 위해 무한천과 곡교천의 식생구조와 관리를 조사 하였다. 무한천은 건강한 생태계를 유지하고 있어, 하천에서 각종 휴양활동을 하기에 충분했다. 그 이유는 습지 식물이 지천으로부터 영양분을 흡수하여 하천의 생태계를 건강하게 보존토록 하기 때문이다. 습지식물은 상류로부터 하류로 갈수록 증가하며, 상류에는 수많은 수목과 습지식물이 나타난다. 그러나 하천의 개발지역인 중류에 는 미국가막사리, 미국개기장과 같은 귀화식물이 우점종을 이룬다. 하천의 생태계를 보존하기 위해서는 하천개발후의 자정작용을 위해 습지식물이 부분적으로 도입되어야 하며, 아울러 지속적인 관리가 요구되어진다. To investigate the impact that the river development effects the river ecosystem, plants ecosystem and structure in Muhanchun and Goggyochun were surveyed. Muhanchun maintains the sound ecosystem. It has sufficient capacity for recreation-activities on the river. The reason is that a hydrophyte absorbs nutrients from the stream and the river ecosystem maintains sound. Number of hydrophyte increase from upstream going forward to downstream. In the upstream various woody plants and hydrophyte appeared. But at midstream, which is the developed area, naturalized plants dominate such as Bidens frondosa, Panicum dichotomiflorum etc. To manage the creek ecologically, hydrophytes should be introduced in partly, for natural purification after rehabilitation of the riverside, and steadily monitoring is demanded.

요골 두 아탈구와 동반된 상완골 내 상과 골절 : 1예 보고 A Case Report

이한용,유기원,정진영,송주현,고해석,강용구,손문익 대한골절학회 2003 대한골절학회지 Vol.16 No.2

주관절 손산 중 상완골 내 상과 골절은 단독으로 혹은 주관절 탈구와 동반되어 발생하는 것이 일반적이다. 저자들은 15세 남자 환자의 좌측 요골 두 아탈구가 동반된 상완골 내 상과 골절을 경험하였다. 도수 정복을 시도하였으나 요골 두 아탈구의 정복을 얻을 수 없어 관혈적 정복술로 치료하엿다. 6개월추시 결과 후휴증이 없는 정상적인 관절 상태를 확인할 수 있었다. 연령, 원인 , 손상 기전으로 분석해 보면 이 동반 손상은 발생하기 매우 어렵고, 문헌 탐색 결과 현재까지 동일한 증례를 찾아볼 수 없었으므로 보고하는 바이다. It has been known that fracture of medial epicondylar apophysis of distal humerus may be isolated of associated with elbow deslocations. We have experienced a case which medial epicondylar fracture of the distal humerus was associated with subluxation of the radial head. Initially, we had tried reduction of subluxated radial head by closed method, but failed. Finally open reduction gad been performed. At 6 month after open reduction, clinical and radiological result were excellent. As it is difficult for those associated injuries to occur simultaneously and the similar cases never have been reported yet, we would like to present this case with a review of the literature.

Al-Mn合金의 再結晶時의 時效析出

李海容,趙顯麒 慶北大學校 産業開發硏究所 1985 硏究報告 Vol.13 No.-

The age-precipitation during recrystallization of supersaturated cold-deformed Al-Mn alloy has been investigated by means of measurements of microvickers hardness, electrical resistivity and transmission electron microscopy. The results obtained are summarized as follows 1. Increasing Mn contents, precipitation rate in the range below the recrystallization temperature was accelerated and recrystallization temperature increased. 2. In the range below the recrystallization temperature, most of precipitation was progressed before recrystallization and in the range above the recrystallization temperature, most of precipitation was progressed after recrystallization. 3. Precipitated phases were Al_6Mn phases at all examined temperatures and precipitation hardening was negligibly small.

공공정보화사업 추진단계별 평가항목 개발

정해용,김상훈 한국정보사회진흥원 2004 정보화정책 Vol.11 No.1

본 연구에서는 공공정보화사업 평가의 주요 문제점으로 제기되어온 평가의 타당성과 포괄성을 보완하기 위하여 정보화사업의 추진단계에 따라 평가를 크게 사전평가(사업추짐 전(前) 단계), 진행평가(사업추진 진행단계), 사후 평가(사업추진 완료후 운영단계)의 세 단계로 구분하고 각 단계별 평가 영역 및 평가항목을 포함한 정보화사업 추진단계별 평가 모형을 제시하고 이를 공공정보화사업의 일환인 문화정보화사업에 적용하였다. 본 연구의 주요 기여도를 요약하면 첫째, 현행 사후평가 중심의 평가에 사전평가 및 진행평가를 포함하고 사후 평가의 경우에도 정보시스템 구축성과, 정보시스템 운영 성과, 조직 및 경영성과 등으로 구분하여 보다 세분화하였으며, 각 평가단계별로 광범위한 이론적 고찰을 통한 평가항목 및 평가 지표들을 도출함에 의해 통합적 평가모형을 제시함으로써 정보화사업평가의 타당성과 포괄성을 제고하였으며, 둘째, 사전평가에 있어서는 사업적 타당동 및 전략적 타당도에 대한 평가 지표를 중시믕로 추진부서의 특징과 사업별 추진목적에 부합하는 평가지표를 도출하기 위하여 핵심성과요인 및 전략적 차원을 고려하여 평가지표를 도출하였으며, 특히 이러한 사전평가의 지표는 사후 평가의 측적 가이드라인으로 활용함으로써 목표중심적 관점에서 평가의 객관성과 신뢰성을 상당 수준 보완하였다는 점이다.

剪斷壁體의 有孔形態에 따른 應力變化에 관한 比較 硏究

구해식,안용덕 경남대학교 공업기술연구소 2001 硏究論文集 Vol.19 No.-

본 연구에서는 전단벽체에 건물의 기능상 설치되는 다양한 형태의 개구부로 인하여 발생되는 응력집중과 이에 따른 내력과 강성이 저하되는 정도를 SAP2000 Solid Element를 이용하여 분석함으로 효율적인 구조해석 및 구조계획이 될 수 있도록 기초자료를 제공하고자 한다. 음력을 단면손실율과 비교해 본 결과 WT형은 주각부에서 음력이 제일 크며 나머지 형태는 우각부와 최상단에서 크게 나타났다. 따라서 응력면에서는 음력집중이 적게 발생하는 WC형과 WB2형을 설치하는 것이 바람직하다. 공간활용면에서는 WT형이 통행에 불편을 줄 수 있으며 WB1형은 응력집중 현상이 나타나므로 WC, WB2, WB3형을 설치하는 것이 좋다. 아파트 시공을 위한 작업통로는 음력집중이 발생하는 WBI형보다 우각부에 필렛을 둔 WC, WB2, WB3형 개구부를 설치하는 것이 좋으며 물량면에서는 WT형이 가장 유리한 것으로 나타났다. By analysing the stress concentration occurred by various openings which is installed at shear wall for function, analyzing the degree of reduction in the internal force and rigidity with the SAP2000 solid element, the purpose of this study is to offer the basic data for the efficient design in the structual analysis and the architectural planing. Type WT is high at the part of column base, but the rest of openings are high at the part of right angle and the top. Type WC and Type WB2 are better than Type WT in considering the stress concentration. Type WT has poor passing and Type WBI Is remarkable in the stress concentration. Therefore the shape of WC, WB2, WB3 is profitable for the opening. The working way is profitable to install at the shape of WC, wB2, WB3 put fillet at the part of angle. In view of the amount of material, Type WT is lower at 15th floor and over than Type WS.

전신성 홍반성 루푸스 환자에서 발생한 다발성 피부섬유종 1예

김용주,김정은,김애리,손상욱,송해준,오칠환 대한피부과학회 2006 大韓皮膚科學會誌 Vol.44 No.4

금속봉이 주기적으로 내장된 도파관 필터 특성 연구

박용현,이정해 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-

In this paper, the characteristics of a periodically loaded conducting post filter in a waveguide were studied experimentally and theoretically. Firstly, a conducting post effects in a rectangular waveguide were investigated with measurement, HFSS simulation, and Mode-Matching method. It is observed that a single conducting post plays an important role in the resonance since it makes capacitance and inductance. Therefore, theses effects need to be carefully considered when theses types of filter are designed. Both the filter and dispersion characteristics of periodically loaded conducting posts filter in a waveguide band-pass filter were measured. The results are compared with simulation, showing a good agreement. Especially, all dispersion curve of the filter structure is found to be linear over wide frequency range, suggesting that this structure could be utilized for the interaction circuit of the wide band Gyro- TWT.

사파이어 기판에 제작한 YBa₂Cu₃O_(7-δ) 박막의 특성연구

임해용,김인선,김동호,박종철,박용기 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

C-axis oriented YBa_(2)Cu_(3)O_(7-δ) (YBCO) thin films on R-cut sapphire substrate were grown by pulsed laser deposition. CeO_(2) film was used as a buffer layer for YBCO deposition on R-cut sapphire substrate. Crystallinity of CeO_(2) buffer layer was researched by XRD. Surface morphology and superconducting properties of YBCO thin films were characterized by SEM and four probe method. Critical temperature of YBCO thin films was ≥89 K, and critical current density was 1.5 x10^(6) A/cm^(2) if at 77 K.