대기오염과 실내 거주자의 활동도가 교실 내부의 입자 크기별 먼지 농도에 미치는 영향

최상준,Choi, Sang-Jun 한국환경보건학회 2008 한국환경보건학회지 Vol.34 No.2

This study evaluated the effects of the human activity and outdoor air on concentrations of size-selective particulate matters (PM) by conducting a realtime measurement in classrooms and on roofs at 4 elementary schools, 3 middle schools and 3 high schools in Incheon City. PM concentrations featured repetitive pattern of increasing during break time (including lunch hours) and cleaning time while decreasing during class hours. This trend was more prominent with inhalable PM and PM10 than fine PMs (PM2.5, PM1.0). The indoor/outdoor (I/O) ratio of inhalable PM and PM10 exceeded 1 while that of fine PMs was close to or below 1. The PM2.5 (out)/PM10 (out) ratio stood at 0.59 (${\pm}0.16$) and the PM2.5 (in)/PM10 (in) ratio was 0.29 (${\pm}0.09$), suggesting that occupant activity had a greater effect upon coarse particles (PM10-PM2.5) than upon fine particles (PM2.5, PM1.0). The correlations between the indoor and the outdoor PM concentrations showed a stronger positive correlation for fine particles than that of coarse particles. The linear regression analysis of PM concentrations indoor and outdoor indicated a higher determinant coefficient ($r^2>0.9$), and consistency for fine particles than in case of coarse particles. In conclusion, the results of this study suggest that the indoor coarse particle concentration is more attributed to occupant activity and the indoor fine particle concentration is more influenced by outdoor air pollution.

최씨 훅을 이용한 복강경 버찌씨 수술

김영혜 ( Young Hye Kim ),박준선 ( Jun Seon Park ),최상준 ( Sang Joon Choi ),송창훈 ( Chang Hoon Song ),한세준 ( Sei Jun Han ),정혁 ( Hyuk Jung ) 대한산부인과학회 2006 Obstetrics & Gynecology Science Vol.49 No.6

목적: 버찌씨 수술은 복압성 요실금 수술에 효과적인 수술로 여겨져 왔다. 요실금의 원인이 내인성 요도 괄약근의 결손소견 없이 요도의 과운동성으로 인한 경우 버찌씨 수술이 일반적으로 추천되어진다. 본 연구에서는 복강경 버찌씨 수술에서 최씨 훅의 유용성에 대해 알아보고자 하였다. 연구방법: 2000년 10월부터 2005년 3월까지 본원에서 복강경 버찌씨 수술을 시행받은 47명의 환자를 대상으로 하였다. 27명은 고전적 복강경 버찌씨 수술을 시행하였고 20명은 내골반 근막을 Cooper 인대를 부착하는데 유용한 본원에서 고안한 최씨 훅을 이용하여 복강경 버찌씨 수술을 시행하였다. 결과: 고전적 복강경 버찌씨 수술을 시행한 군과 최씨 훅을 이용한 복강경 버찌씨 수술을 시행한 군의 평균 나이, 분만력, 폐경률, BMI는 두 군간에 통계학적으로 유의한 차이를 보이지 않았다 (p>0.05). 수술 시간은 고전적 복강경 버찌씨 수술은 90.52±15.32분, 최씨 훅을 이용한 복강경 버찌씨 수술은 38.50±10.14분으로 최씨 훅을 이용한 경우 수술시간이 통계적으로 유의하게 짧았다 (p<0.05). 두 군간에 재발률 및 합병증 발생은 통계적 유의성을 보이지 않았다 (p>0.05). 결론: 본 연구에서 본원에서 고안한 최씨 훅을 이용하여 복강경 버찌씨 수술을 시행한 결과 수술 시간을 단축시킬 수 있었으며 수술 효과는 기존 방법과 동일하게 관찰되었다. 이에 최씨 훅은 복강경 버찌씨 수술에서 사용할 때 집도자의 봉합 과정을 단순화시켜 수술 시간을 단축시키므로 복강경 버찌씨 수술에 용이한 기구이다. Objective: Burch operation has been effective method for the treatment of stress incontinence. Burch operation is a well-accepted procedure for treating stress urinary incontinence secondary to urethral hypermobility without intrinsic sphincter deficiency and is the reference standard with which other procedures are compared. This study is to evaluate the effectiveness of the Choi`s hook in laparoscopic Burch operation. Methods: This study included 47 patients who had undergone laparoscopic Burch operation from October 2000 through March 2005. Of these 47 patients, 27 patients underwent traditional laparoscopic Burch operation (Group 1) and 20 patients underwent laparoscopic Burch operation with Choi`s Hook on anchoring the endopelvic fascia to the Cooper`s ligament (Group 2). Results: The mean age of patients of Group 1 was 55.6±9.37 years of age and that of Group 2 was 56.0±5.93 years of age. There is no difference in the mean age of patients (P>0.05). The mean operating time was 90.5±15.32 minutes for Group 1 and 38.5±10.14 minute for Group 2. The mean operating time was shorter in Group 2 than Group 1 (P<0.05). There was no difference in recurrence rate and complication rate between Group 1 and Group 2 (P>0.05). Conclusion: We performed laparoscopic Burch operation with the Choi`s Hook on anchoring the endopelvic fascia to the Cooper`s ligament. When we compared traditional laparoscopic Burch operation with laparoscopic Burch operation with Choi`s Hook, we could shorten the operation time using the Choi`s Hook.

비닐하우스 내 국화 재배 농업인의 Dichlorovos 노출 평가 사례

최상준 ( Sang Jun Choi ) 대구가톨릭대학교 자연과학연구소 2009 자연과학연구논문집 Vol.7 No.1

This study was conducted to evaluate the farmer`s exposure to dichlorovos during application in greenhouse for culturing Chrysanthemum. Eight hour time weighted average airborne concentrations of dichlorovos with personal and area sampling were 0.14 ㎎/㎥ and 1.12∼1.68 ㎎/㎥, respectively. The exposure to dichlorovos exdeed the occupational exposure limits recommended by ACGIH, OSHA, and NIOSH in all cases. The highest CO concentration was 230 ppm and was attributable to the use of motorized applicator running on gasoline. TVOC concentrations started to go down with ventilation by opening windows of a greenhouse. In conclusion, sufficient ventilation of a greenhouse is recommended after application in order to minimize pesticide exposure of farmers.

유리병 및 캔 재활용 분류기 설계

최상준(sang-jun Choi),이승준(seung-jun Lee),박성환(seong-hwan Park),유종규(jong-gue You),노경부(kyeong-bu Roh),이돈규(Don-kyu Lee) 대한전기학회 2013 대한전기학회 학술대회 논문집 Vol.2013 No.7

Occupational Exposure to Styrene in Laminating Process for Manufacturing Double Walled Tank with Fiberglass-Reinforced Plastics

최상준 ( Sang Jun Choi ),선옥남 ( Ok Nam Sun ),전용희 ( Yeon Hee Jeong ) 대구가톨릭대학교 자연과학연구소 2011 자연과학연구논문집 Vol.9 No.1

This study was conducted to characterize workers` exposure to styrene by job and task in laminating process for manufacturing double walled tank with Fiber-Reinforced Plastics (FRP). We identified styrene in raw materials such as unsaturated polyester resin (UPR), hardner, toner, and cleaner by gas chromatography with mass spectrometer. Personal samples for airborne styrene and mandelic acid in urine were sampled and analyzed by gas chromatography with a flame ionized detector and high performance liquid chromatography with ultraviolet detector, respectively. A major emission source of styrene was UPR which contained 37 % styrene by weight. Full shift exposure levels of styrene in air for sprayer and helper exceeded occupational exposure limit in Korea (20 ppm). Short term exposure level of styrene for spraying with FRP ranged from 45.9 ppm to 86.1 ppm, significantly higher than the case without FRP (p<0.01). The highest exposure to styrene was shown during the first coating with FRP which correspondingly represents the process that calls for precaution. Urine mandelic acid concentration did not exceed the biological exposure index, which is attributable to the practice of wearing air purifying respirator. It was indicated that workers in laminating process with FRP are exposed to styrene at high levels. They should wear personal respirator with properly replaced cartridge based on service life. The service life of mask used in this study is estimated as 8 days based on the airborne styrene concentration of 50 ppm.

범위질의 검색을 위한 캐시적응 T-트리 주기억장치 색인구조

최상준(Sang-Jun Choi),이종학(Jong-Hak Lee) 한국멀티미디어학회 2009 멀티미디어학회논문지 Vol.12 No.10

고농도 수은 노출의심 환자의 생물학적 노출 평가

최상준 ( Sang Jun Choi ),양행선 ( Hang Sun Yang ),임상혁 ( Shang Hyuk Yim ) 대구가톨릭대학교 자연과학연구소 2008 자연과학연구논문집 Vol.6 No.1

The effect of mercury on the body vary with the age and overall heath status of the exposed individual. Exposure of mercury can result in neurologic, respiratory, renal, reproductive, immunologic and dermatologic effects. This study intends to introduce results of biological monitoring during ten months about patient suspected high level exposure to mercury. Blood and urine were sampled from patient at six times. Mercury concentrations of blood and urine were approximately 160~562 ㎍/ℓ, and 600~5383 ㎍/ℓ respectively. According to time mercury concentration of biological samples decreased. Chelation was more effective in the mercury excretion by urine.

위험도 평가이론에 기초한 효율적 작업환경 관리 방법

최상준 ( Sang Jun Choi ) 대구가톨릭대학교 자연과학연구소 2011 자연과학연구논문집 Vol.9 No.1

In terms of occupational safety and health management, the ultimate goal of work environment control was to protect or promote workers` health. However, we can found a lot of control cases which are ineffective or irrelevant to workers` health protection. So, the purpose of this article was to discuss the principle for effective control measures based on the theory of risk assessment at work. In order to protect workers` health, we should control the risk at work. The level of risk was dependent on the hazard and exposure dose of hazardous agents in workplace. The first principle for the control of work environment was trying to eliminate or substitute hazardous agents with the lower toxicity. The second principle was to lower the exposure dose of agents by focusing on the step of emission. The personal protection equipment program should be considered as the last means.

자궁경부암에서 E-cadherin/β-catenin 복합체의 발현

최상준 ( Choi Sang Joon ),한세준 ( Han Se Jun ),정혁 ( Jung Hyuk ),안태규 ( Ahn Tae Gyu ),송창훈 ( Song Chang Hun ),임성철 ( Lim Sung Chul ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.7

저자들은 71예의 자궁경부종양을 대상으로 E-cadherin, β-catenin 발현 정도 및 분포 양상을 임상병기, 환자의 나이, 종양의 진행정도 및 림프절 전이여부와 관련있는지 알아보고자 하였다. 연구 방법 : 자궁 경부 편평상피 종양 중 심한 이형성증 3예, 상피내암 22예, 미세침윤성 암 10예, 침윤성암 36예 총 71예의 조직절편을 면역조직화학염색을 하여 E-cadherin, β-catenin의 염색 정도와 분포 양상을 조사하여 자궁경부암의 조직학적 분화정도, 임상 병기와 관련이 있는지 분석하였다. 결과 : E-cadherin은 71예 중 54예에서 (76.1%), β-catenin은 71예 중 53예에서 (74.6%) 변이성 발현을 보였다. E-cadherin과 (p<0.005) β-catenin의 (p<0.005) 비정상 발현은 종양의 진행, 임상병기와 관련 있었다. 결론 : E-cadherin, β-catenin의 비정상 발현이 자궁경부 편평상피 종양의 조직학적 분화, 임상병기와 관련 있는 것으로 보아 E-cadherin, β-catenin이 편평상피 종양의 조직학적 분화와 종양의 진행에 관여할 것으로 추정된다. Objective : The objective of this study was to determine relationship between alteration of expression of E-cadherin, β-catenin and tumor progression, clinical stage, lymph node metastasis, age of patients with uterine cervical cancer. Methods : The authors evaluated the immunohistochemical expression pattern of E-cadherin and β-catenin in relationship with tumor stage and clinicopathologic parameters in 71 cervical neoplasia including 36 cases of squamous cell carcinoma (SCC), 10 cases of microinvasive SCC, 22 cases of squamous cell carcinoma in situ, and 3 cases of severe dysplasia. Results : There were aberrant expression in 76.1% of E-cadherin (54 of 71) and 74.6% of β-catenin (53 of 71) in the cervical cancer. There was positive correlation of aberrant expression of E-cadherin with tumor progression and clinical stage (<0.005). There was positive correlation of aberrant expression of β-catenin with tumor progression and clinical stage (<0.005). Conclusion : These results suggest that degree or the pattern of E-cadherin, β-catenin, and E-cadherin/β-catenin complex may be related to histologic grade and clinical stage of uterine cervical cancer.

중앙난방 아파트 거주자에 대한 실내공기 오염 평가

최상준(Sang Jun Choi),백남원(Nam Won Paik) 서울대학교 보건환경연구소 2002 보건학논집 Vol.39 No.1