금속 판재의 성형한계도 시험법에 관한 연구

장욱경,장윤주,김형종 江原大學校 産業技術硏究所 2010 産業技術硏究 Vol.30 No.A

A forming limit diagram (FLD) defines the extent to which specific sheet material can be deformed by drawing, stretching or any combination of those two. To determine the forming limit curve (FLC) accurately, it is necessary to perform the tests under well-organized conditions. In this study, the influence of several geometric or process parameters such as the blank shape and dimensions, strain measuring equipments, test termination time, forming speed and lubricants on the FLC is investigated.

엔로플록사신 액제의 닭 호흡기 및 소화기 감염증에 대한 예방 및 치료효과

윤효인,박병권,조준형,정상희,박경환,장범수,김종춘,황윤환,임종환,이내경,박승춘 충남대학교 수의과대학 동물의과학연구소 2000 動物醫科學硏究誌 Vol.8 No.-

We evaluated the efficacy of the liquid form of enrofloxacin against poultry respiratory and digestive infections, the major problems in the poultry industry, from diverse diagnosis viewpoints. Results obtained through this study were as follows: 1. The liquid form of enrofloxacin showed good acceptability to poultry owing to no abhorrence to the drug by chickens, which indicated its suitability for mixing in drinking water. 2. The application of the enrofloxacin formulation improved the productivity of the chicken farm to a great extent by lowering the death toll of chicken raised in the farm. 3. The use of the drug shortened the days to the market, and increased the body weight at the time of marketing. 4. Preventive and therapeutic effects of the liquid enrofloxacin were observed higher than ampicillin, a major antibiotic used in poultry farming. From above results, the liquid form of enrofloxacin would find its use for the prevention and treatment of digestive and respiratory infections, let alone the growth promotion and feed efficiency, especially in the chicken farming practice.

건설 사업장의 작업 공정별 분진 발생량 평가

장봉기,이종화,박종안,최윤나,이익진 순천향대학교 기초과학연구소 2004 순천향자연과학연구 논문집 Vol.10 No.2

Airborne dust emission among construction industry place of work that locate on Pyeongtaek, Gyeonggi province of 4 processes (a plaster, cutting, hammer drill, concrete grinding) were analyzed. Work did in state that a worker does not exist except measurer as well as is not attained to control group. Investigation period did for 2 months from October to November. It measured 15 times by each process by personal air sampling method that is direct-reading particulate matter measurement device(digital dust indicator). When a plaster work, the dust was class 3 particulate matter, and geometric mean is 2.14㎎/m³, and occasion that exceed 10㎎/m³ that is threshold limit value was 13.3%. Control group was 0.35㎎/m³. plaster work was statisically difference higher than the control group (p<0.001). It was not significant difference between fixed type cutting machine work (0.96㎎/m³) and control group. It were not exceeded for threshold limit value. Geometric mean was 10.44㎎/m³ at movable type cutting machine process. Threshold limit value of this process was exceeded 53% and concentration of total dust was significantly higher than control group (p<0.001). Geometric mean was 3.22㎎/m³ at diameter 13.45㎜ drill work among hammer drill work and all cases not exceeded for threshold limit value, but it was significantly higher than control group(p<0.001). When work diameter 6.5㎜ drill, geometric mean was 4.06㎎/m³ and exceeded for threshold limit value was 13.3%, it was significantly higher than that of control group (p<0.001). It showed higher concentration of dust by diameter is smaller drilling. All 15cases exceeded threshold limit value at concrete grinding work, geometric mean was 78.38㎎/m³, and it was significantly higher than that of control group (p<0.001). As a result of above, countermeasure preparation that concentration of total dust by each process in construction workplace was specially required because exceeded threshold limit value of working environment more than 50% at process of concrete grinding work and movable type cutting machine.

저소음 덕트의 개발

윤종태,장영환,정장표 경성대학교 생산기술연구소 1997 생산기술연구지 Vol.4 No.-

Recently, the high level noise from the water drainage duct in apartments raised serious social problems. Therefore, the development of noise reduction duct which can both keep the proper drainage function and have high efficiency of noise reduction is needed. In this study, the dual hallowed type of noise reduction duct was developed and its performance tests such as noise reduction effect, strength test etc, were conducted. From the results of performance tests, the noise reduction duct developed by this study was sufficient for market competition compared to pre-made PVC duct.

엔로플록사신 액제의 닭유래 병원세균에 대한 시험관내 항균효과 시험

윤효인,박병권,조준형,정상희,박경환,장범수,김종춘,황윤환,임종환,이내경,박승춘 충남대학교 수의과대학 동물의과학연구소 2000 動物醫科學硏究誌 Vol.8 No.-

In this study the antimicrobial spectrum and sensitivity of a liquid formulation of enrofloxacin against the major six pathogenic bacteria isolated from the diseased poultry in Korea were evaluated in comparison with ciprfloxacin (CFX), gentamicin (GM) and penicillin (PC). A liquid form of enrofloxacin, a test material and ciprofloxacin showed at least 83% antibacterial activity against all of six test pathogenic microorganisms at the fixed concentration of 10 ㎍/㎖. Gentamicin and penicillin revealed much lower antibacterial activity at the same condition. We evaluated the liquid form of enrofloxacin as having widespread antibacterial spectrum against poultry infections. The liquid form of enrofloxacin showed potent antibacterial activity, with the MIC range being 0.12∼2 ㎍/㎖ against Gram positives, 0.06∼2 ㎍/㎖ against Gram negatives and 0.5∼2 ㎍/㎖ against Mycoplasma spp. These values were equivalent to or somewhat higher than those of ciprofloxacin, but much lower than those of gentamicn and penicillin. This new liquid form of enrofloxacin would find its way in application of mixing with drinking water for the prevention and treatment of diverse infections in chickens.

평택시 미군기지 주변 주민의 비행기 소음과 청각학적 평가결과의 관련성

정종도,김현주,정재윤,노상철,권호장 大韓産業醫學會 2009 대한직업환경의학회지 Vol.21 No.2

목적: 비행기소음이 청각에 대한 포괄적인 영향을 파악하기 위하여 이명 및 난청과의 관련성을 규명하고자 한다. 또한 변조이음향방사 검사를 통해 비행기소음의 난청에 대한 영향을 객관적으로 파악하고자 하였다. 방법: 연구 대상지역은 평택시에 위치한 두 개의 미군기지(K-55, K-6) 주면 8개 마을로 선정하였고 대조지역은 비행장에서 10 km 이상 떨어진 5개 마을이었다. 연구대상은 전도성 난청자와 순음청력검사에 협조가 불가능한 경우를 제외하고 노출군 492명 , 대조군 200명이었다. 환경소음은 2005년 12월 9일, 노출지역 8개, 대조지역 2개 마을을 동시에 주간 8시간 측정하였다. 구조화된 설문지를 통해 이명 여부와 그 불편감을 조사하였고, 이명 불편감은 구조화된 '이명 불편감 설문지'를 통해 파악한 뒤감정적, 기능적, 재앙화적 측면에서의 점수를 합산하여 산출하였다. 청력평가를 위해 0.5, 1, 2, 3, 4, 6, 8 kHz에 대하여 순음청력검사와 1582, 2003, 3175,4007 Hz에 대하여 번조이음향방사 검사를 시행하였다. 비행기소음의 노출특성 및 혼란변수의 성차를 고려하여 성별층화분석을 했고, 연속변수는 일반선형모델(general linear model)을 사용하여, 범주형 변수는 로지스택 회귀분석을 사용하여 분석하였으며, 보정한 혼란변수는 연령, 교육정도, 스트레스 반응척도, 군대소음, 농업소음, 직업소음이었다. 결과: 이명 증상 호소율은 남성에서 노출군 47.3%, 대조군 27.6%이었고, 여성에서 노출군 50.8%, 대조군 28.5%이었으며, 그 대응비는 남성에서 2.06(95% CI:1.09~3.88), 여성에서 1.97(95% CI: 1.17~3.30)이었다. 이명 불편감 영역별 점수는 남녀 모두에서 감정적, 기능적, 재앙화적 측면에서 노출군이 비노출군보다 유의하게 높았다(p<0.001). 순음청력검사결과 남성에서는 우측 귀 0.5, 1 kHz에서, 여성에서는 좌측 귀 0.5, 1 kHz와 우측 귀 0.5, 1, 2, 3, 4, 6 kHz 주파수 영역에서 노출군의 청력역치가 대조군보다 유의하게 높았다(p<0.05). 변조이음향방사 검사결과, 남성에서는 두 군간에 비정상률의 차이가 없었으나, 여성의 비정상률은 좌측 귀 3175, 4007 kHz 영역에서 각각 1.92(95% CI:1.10~3.36), 2.71 (95% CI: 1.49~4.91), 우측 귀 각각 1.73(95% CI: 1.01~2.99), 1.78(95% CI:1.01~3.15)의 대응비를 보였다. 결론: 연구결과 수십 년간 군 기지의 비행기소음에 노출된 집단에서 이명과 이명 불편감이 대조군보다 유의하게 높았다. 순음청력검사는 노출군이 대조군보다 통계적으로 유의한 청력저하를 보였다. 변조이음향방사 검사는 여성 노출군에서만 대조군보다 통계적으로 유의한 비정상률을 보였다. 이로부터 비행기소음이 이명과 난청 등 삶의 질에 영향을 미치는 건강문제를 유발할 가능성을 확인할 수 있었다. Objective: To investigate the relationship between aircraft noise and the results of audiological evaluation on tinnitus and hearing loss among residents near United States military air-bases in Pyeongtaek city. Methods: Residents (n=492) exposed to aircraft noise were selected from eight villages near U.S. military air-bases (K-55 and K-6) in Pyeongtaek city. Residents (n=200) from five villages located at least 10km away from the air-base were selected for the control group. All participants completed a questionnaire on tinnitus and audiological evaluations included pure tone audiometry (PTA) and distortion Product otoacoustic emissions (DPOAE). Statistical analyses involved a general linear model and multiple logistic regression stratified by gender and data was a쏜usted by age, educational level, stress response index and noise type (i.e. military, agricultural and occupational). Results: The equivalent noise levels (Leq) in the vicinity of the air-field were 73.4~81.5 dB (A). Tinnitus prevalence was 47.3% and odds ratio (OR) was 2.06 (95% confidence interval (CI): 1.09-3.88) among noise-exposed males. Tinnitus prevalence was 50.8% and OR was 1.97(95% CI: 1.17~3.30) among noise-exposed females. Tinnitus handicap scores among exposed group were significantly higher in functional, emotional, and catastrophic subclasses (P<0.001). PTA revealed hearing thresholds among the exposed group of 0.5 and 1 kHz (male right ear), 0.5 and 1 kHz (female left ear) and 0.5, 1, 2, 3, 4 and 6 kHz on female right ear that were significantly higher than those of the unexposed group. No Significant difference in DPOAE was observed among noise-exposed mes. However, significant differences were evident for noise-exposed females at 3175 and 4007 Hz. ORs of right female ears 3175 and 4007 Hz were 1.73(95% CI: 1.01-2.99) and 1.78(95% CI: 1.01-3.15). ORs of left female ears at 3175 Hz and 4007 Hz were 1.92(95% CI: 1.10-3.36) and 2.71(95% CI: 1.49-4.91) Conclusions: Aircraft noise may adversely affect hearing function and tinnitus.

유방에서 기원된 전이성 췌장암종 1예 : A case report

김윤신,이미숙,장원재,임성철,기근홍,전호종,서재홍 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.2

Pancreas is known for the unfavorable soil to the metastatic carcinoma, and pancreatic metastasis is achieved after systemic dissemination was developed. The primary tumors of metastatic pancreatic carcinoma are breast, lung, Iymphoma, malignant melanoma, leukemia, stomach. and colon. The breast carcinoma is the commonest tumor to metastasize to pancreas and both tumors are related to estrogen receptor for tumor growth. In the present case, tumor cells had small round nucleus and showed indian file infltrating pattern and lack of cohesion, which are seen in infiltrative breast carcinoma. The patient was underwent radical mastectomy due to infiltrative ductal carcinoma three years ago. And also the tumor cells showed nuclear reactivity to immunostaining for estrogen receptor In combination of the histopathologic. immunohistochemical, and her past history, we concluded that breast carcinoma was metastasized to pancreas, and we report a case of metastatic pancreatic carcinoma from breast with review of literatures.

변이형 협심증 환자의 진단에 있어 Iodine-123Metaiodobenzylguanidine 심근 스캔의 유용성

하종원,이종두,장양수,정남식,권준,임세중,이영준,심원흠,조승연,김성순 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.2

관동맥 우회로 이식술후 우회 혈관의 개존 여부 평가에 있어 전자선 단층 촬영을 이용한 3차원 혈관조영술의 유용성

하종원,조승연,심원흠,정남식,이향미,최규옥,장양수,유경종,강면식 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.5

술폰기가 도핑된 폴리피를 제조 및 전기화학적 특성

박종호,김지윤,장순호,조영일 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4

정전류 중합법으로 도펀트의 화학적 구조와 크기에 따라 폴리피롤 막을 ITO 전극위에 합성하고 전기화학적 특성을 알아보았다. 전해중합 효율은 SBA, PVS, BDS 순으로 증가하였고 합성 전기량의 증가에 따라서는 변화되지 않았다. SBA를 도펀트로 제조된 폴리피롤 막은 산화 과정에서 음이온 및 양이온 교환특성이 나타남을 CV를 통해 알 수 있었다. 도펀트가 BDS인 폴리피롤 막은 전류밀도 1 mA/㎠에서 가장 높은 속도 상수 값을 나타내었다. 또한 선형분극 법으로 측정한 확산계수는 이중층 용량 성분 때문에 임피던스 법으로 구한 값보다 크게 나타났다. According to chemical structure and size of dopant, the polypyrrole films were prepared by constant current polymerization method on ITO electrode and its electrochemical properties were investigated. The current efficiency of polymerization of pyrrole was increased in the sequence 4-sulfobenzoic acid(SBA), polyvinylsulfonic acid(PVS), 1.3-benzenedis-ulfonic acid(BDS) and was unchanged with electricity of polymerization. As a result of cyclic voltammetry of polypyrrole film prepared with SBA as dopant, ion-exchange behavior both of anion and cation was observed during oxidation process. The maximum rate constant of polypyrrole doped with BDS was obtained at 1 ㎃/㎠. In addition, the diffusion coefficient calculated by linear polarization method was more large than that measured by impedance analysis due to double layer capacitance.