하계 실내 및 실외환경의 공기 중 휘발성 유기화합물 농도 및 개인노출

양원호,손부순,박종안,장봉기,박완모,김윤신,어수미,윤중섭,류인철 한국환경과학회 2003 한국환경과학회지 Vol.12 No.9

Volatile organic compounds (VOCs) are present in essentially all natural and synthetic materials from petrol to flowers. In this study, indoor and outdoor VOCs concentrations of houses, offices and internet-cafes were measured and compared simultaneously with personal exposures of each 50 participants in Asan and Seoul, respectively. Also, factors that influence personal VOCs exposure were statistically analyzed using questionnaires in relation to house characteristics, time activities, and health effects. All VOCs concentrations were measured by OVM passive samplers (3M) and analyzed with GC/MS. Target pollutants among VOCs were Toluene, o-Xylene, m/p-Xylene, Ethylbenzene, MIBK, n-Octane, Styrene, Trichloroethylene, and 1,2-Dichlorobenzene. Indoor and outdoor VOCs concentrations measured in Seoul were significantly higher than those in Asan except Ethylbenzene. Residential indoor/outdoor (I/O) ratios for all target compounds ranged from 0.94 to 1.51 and I/O ratios of Asan were a little higher than those of Seoul. Relationship between personal VOCs exposure, and indoor and outdoor VOCs concentrations suggested that time-activity pattern could affect the high exposure to air pollutant. Factors that influence indoor VOCs level and personal exposure with regard to house characteristics in houses were building age, inside smoking and house type. In addition insecticide and cosmetics interestingly affected the VOCs personal exposure. Higher exposure to VOCs might be caused to be exciting increase and memory reduction, considering the relationship between measured VOCs concentrations and questionnaire (p<0.05).

VP-16으로 성공적으로 치료된 위 Kaposi 육종 1예

양웅석,송근암,조몽,이재승,송철수,김형욱,김영민,이수봉,김태오,이성훈 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.4

The skin is an uncommon site of distant metastasis from any internal malignancy, and the incidence of metastatic skin lesions as the first symptom of disease is only 0.8% in patients with all systemic malignancies. Furthermore, cutaneous metastasis from adenocarcinoma of the stomach has been found to be extremely rare. A 35-year-old female patient was admitted due to multiple cutaneous nodules in her chest, abdomen, and back. A gastroendoscopic examination and biopsy was made according to the results of skin pathologic findings. Stomach and skin biopsy results revealed a signet ring cell type of adenocarcinoma. A case of gastric adenocarcinoma in which metastatic skin nodules appeared as the first sign of disease, is here in reported with a review of related literature.

차 영상을 이용한 실시간 무인 영상 감시시스템

양성수,지유강,박수봉 동신대학교 2006 論文集 Vol.16 No.-

무인 영상 감시 시스템은 각종 보안과 범죄예방에 대한 관심이 커지면서 감시 카메라를 이용하여 움직이는 물체를 추적하는 영상처리 시스템에 대한 관심이 크게 증가하고 있다. 본 논문에서는 CCD 카메라로 입력되어진 초기 설정된 배경 영상과 움직이는 영상을 분리하여 움직이는 영상만을 추적하고 기록하는 시스템을 설계하고, 실시간 개체 추적 알고리즘을 통해 CCD 카메라에서의 움직임 추적 방법에 의하여 감시 영역내의 움직임을 자동적으로 추적하고 이러한 움직임을 효과적으로 추출할 수 있는 원리를 제시하고자 한다. 먼저, 시간 주파수 저역 통과 필터(Temporal low-pass filtering)를 사용하여 움직이는 물체로부터 영상의 특징 변화를 획득한고 이를 추적한다. 이렇게 움직임이 발견되는 동안 이 비디오 정보를 저장한다. 이때 배경의 변화 및 밝기의 변화에 조금씩 오류가 발생되는 경우 이외 특이한 상황 변화는 거의 나타나지 않았고 움직임 물체의 밝기가 근처 배경 화소점의 밝기와 상당히 비슷하게 되는 영역에서는 물체의 추출이 순간적으로 어려워짐을 알 수 있었고, 반면에 상대적으로 높은 영상 잡음의 간섭이 있는 환경 아래서도 움직임 추출 및 분리 성능을 보였다. 본 논문에서 제안한 영상 시스템을 기반으로 한 감시 영상의 효율적 기록 및 검색 시스템은 앞으로 보다 대중적으로 쉽게 사용할 수 있을 것이다. There has been much increase of interest in image processing systems detecting moving objects using watching cameras, together with the increase of interest in security and crime prevention. This study was carried out to design a system which separates the background image input by CCD camera and the moving images, and which detects and records only the moving images, and to suggest a principle which can detect automatically and search effectively the moments in the watching area by the moving detection methods from CCD camera through real time object detection algorism. This system acquires and detects the feature changes of image from moving objects using temporal low-pass filtering while recording the video information. Apart from the little error in the changes of background and brightness, particular changes of situation did not occur. Searching objects was temporally difficult in the areas where the brightness of moving objects was similar to that of the nearby background. On the other hand, searching and separating movements was excellent even under the circumstances of relatively high intervention of image noise. It is expected that the image system based effective recording and searching system of watching image will be widely and popularly used in the near future.

나선형 이중 평행판 축전기형 Blumlein 전송회로를 사용한 소형 질소레이저의 동작 특성 연구

양준묵,이치원,조돈수,이봉연 충남대학교 기초과학연구소 1995 忠南科學硏究誌 Vol.22 No.1

The design and performance of a compact nitrogen laser which consists of a Spiral multiple parallel plate capacitor type Blumlein transmission line circuit are described. The laser tube is made by 50 ㎜ long with a 2.5 ㎜ main electrode gap spacing. The output power increased with the spark gap distance. The peak power of 3.0 μJ has been obtained with a spark gap distance of 3.5 ㎜ and a repetition rate of 30㎐. The optimum nitrogen gas pressure was about 60torr independent of the variation of spark gap distance. The laser operates with repetition rate of up to 70 ㎐.

사람 뇌척수액중 Transthyretin의 항산화작용

양성렬,최기오,박종근,류문희,홍석노,김수한,안봉환,이제혁,이민화 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.4

Protective effects of human cerebrospinal fluid antioxidants against enzyme inactivation caused by metal-catalyzed oxidation systems were investigated. When purified glutamine synthetase(GS) was incubated with human cerebrospinal fluid(CSF), the enzyme was progressively inactivated. Catalase and EDTA could inhibit the enzyme inactivation by 50-80%. Small-molecular(Mr< -10,000) fraction of CSF inactivated the exogenous GS, but large-molecular(Mr> -10,000) fraction did not. The GS inactivation by the small-molecular fraction was also markedly inhibited by catalase and EDTA. These results suggested that metal-catalyzed oxidation is involved in the GS inactivation by the small-molecular fraction of CSF. Dithiothreitol(DTT) was shown to inhibit almost completely the oxidative inactivation of GS by CSF. However, DTT inhibited only partially the oxidative inactivation of GS caused by small-molecular fraction of CSF. When large-molecular fraction of CSF was separated by anion-exchange HPLC chromatogrpahy, there was a peak of antioxidant activity inhibiting the small-molecular fraction-induced GS inactivation in the presence of DTT. The antioxidant activity was neutralized by monoclonal antibodies to transthyretin. Purified transthyretin was found to efficiently inhibit ascorbate/Cu^(2+)-induced GS inactivation in the presence of DTT. Uric acid and glucose did not show any protective effect on the GS inactivation in the same condition. The above results suggest that metal-catalyzed oxidation occurs normally in human CSF, and that transthyretin may play an important role as a CSF antioxidant in protecting proteins from metal-catalyzed oxidation.

시판된장의 숙성정도 예측을 위한 전자코의 적정조건

양영민,노봉수,이택수 서울여자대학교 자연과학연구소 1997 자연과학연구논문집 Vol.9 No.-

본 연구는 된장의 숙성 정도를 6개의 metal oxide 센서가 내장된 휴대용 전자코를 이용하여 예측하고자 하였다. 15℃에서 숙성시킨 시판된 장은 60일 정도에 감도가 급격히 떨어지기 시작해 그 이후로는 거의 변화가 없으며 15℃에서 숙성하다가 33일부터 25℃로 숙성 온도를 달리 하여 숙성시킨 된장은 38일부터 감응도가 급격히 떨어지기 시작해 그 이후에는 거의 일정하였다. 센서 감응도의 기울기와 상관계수를 비교해 보면 15℃에서 숙성시킨 된장보다 25℃에서 숙성시킨 된장이 센서 감응도 변화량, 상관계수값 모두 크고, 6개의 센서 중에서는 #2, #4이 가장 민감하였다. This study is to predict fermentation time of commercial soybean paste by a electronic nose that has six metal oxide sensors. #2 and #4 sensors were more sensitive to volatile components of soybean paste than any other sensors. The sensitivity of the electronic nose to a commercial soybean paste was rapidly reduced after 60 days at 15℃ and not too much changed thereafter. It was also reduced after 38 days when temperature was changed from 15℃ to 25℃ after 33 days. The correlation between sensitivity of sensor and fermentation time was evaluated. The correlation coefficient and changes of sensitivity at 25℃ was higher than that at 15℃

효소 전처리 BCTMP 시트의 노화 거동

양봉숙,김형진,강규영,조병묵,오정수 동국대학교 생명자원과학대학 연습림 2000 연습림논문집 Vol.- No.6

It was generally known that the aging treatment of paper is accompanied with the reductions in physical and optical properties of individual fibers and sheet. In particular, the paper prepared with mechanical pulps occurs the yellowing of sheet, during aging, due to the absorption of light or temperature, and finally has limitation in widely applicable functions of paper. The aging behaviors of paper can be discussed with three groups of factor. One is considered to external factors, like heat, light and moisture. Another is commented with environmental factors, like oxygen, nitrogen, sulfur, and other air pollutant materials. The other is explained by internal factors, like pulp types, lignin contents, and so on. In this paper, the aging behaviors of paper prepared with BCTMP were studied in order to know how to affect in physical and optical properties of paper. For modification of fibers properties, a commercial enzyme was pretreated in the slurry of BCTMP, before handsheet-making. Sheets were aged by accelerated heat treatment. The comparisons were carried out in mechanical strength properties and color reversions. Aging treatments were resulted in higher brightness reductions, in enzyme pretreated paper.

고양이 위 평활근 수축에 대한 Vanadate와 Pervanadate의 효과

심상수,최효봉,심혜선,이덕주,윤신희,한상준,김명석,조양혁 大韓消化器病學會 1999 大韓消化器病學會誌 Vol.33 No.1

An Exprimental Study of Postoperative Intraabdominal Adhesions

이봉우,최봉락,양동휘,김인호,손수상,강중신 啓明大學校 醫科大學 1986 계명의대학술지 Vol.5 No.2

수술후 나타나는 장유착은 적지 않은 빈도를 나타내며 보편화된 개복 수술후 증가된 유착성 장폐색증은 외과영역에서 중요한 문제의 하나로 많은 연구보고가 되고 있으며 유착의 형성은 기계적, 세균학적 및 화학적 외상 즉 복강내 외상이나 손상후의 치유과정의 한단계로 유착이 나타난다고 한다. 장유착의 원인과 이차적인 병태생리학적인 변화에 대한 충분한 이해를 갖고 조기에 적절한 치료를 하면 이병율과 사망율을 감소시킬 수 있는 질환이다. 저자들은 한국산 성숙된 가토를 이용하여 실시한 실험적 연구로써 도끼 60마리를 각 20마리씩 3군으로 나누어 관찰하였다. 즉 모든 토끼는 ether로 open drip마취를 하고 정중선 복별절개로 개복한 후 5.0+ 5.0cm정도의 전벽복막을 점상 출혈이 나타날 때 까지 찰과상을 형성시켜 그 결과를 관찰하였다. 제1군의 20마리는 단지 scratching method만 시행한 control group으로 하고 제2군의 20마리에서는 scratchiing method 후 복강내 polyethylene feeding tube를 넣고 매일 50ㅊㅊ의 생리식염수를 중비하였으며 제3군 20마리에서는 복강투석액인 peritosol solution으로 생리식염수 대신에 매일 50cc씩 복강내에 주입하여 관찰 비교하였다. 모든 토끼들은 개복술 10일후 재 개복하여 복막의 유착과 소장간의 유착정도를 관찰비교하여 다음과 같은 결과를 얻었기에 문헌고찰과 함께 보고하는 바이다. Control group에서는 20예중 유착정도가 15예에서 나타나 75%를 나타내었고 생리식염수 투여군에서는 20예중 13예에서 나타나 65%의 유착을 나타내었으며 peritosol군에서는 20예중 9예로서 45%로 감소된 유착양상을 나타내었다. 본 실험에서는 peritosol투여군이 control group이나 생리식염수 투여군보다 실험적 유착상태가 적은 것에 유의를 하였으며 아직 인체에 peritosol세척 시도는 못해 보았지만, 본실험과 같은 효과가 있다면 술후 장유착 예방에 의의가 있을 것으로 사료되어 보고 드리는 바이다.

한국인 태아 및 사산아에서 얼굴신경에 대한 형태학적 연구

강양수,김종중,김복,정상봉,문영민,설경수,정윤영 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.3

It is critical that the accurate anatomy of the facial nerve IS known for uncomplicated successful facial surgery. Such an operation is hazardous because of the intimate relationship between the facial nerve and the expressional muscles. It is hoped that such basic information will be helpful to those who treat conditions involving the facial region. In order to define the detail of this relationship, many studies have been undertaken on dissected adult specimens. This study was based on Korean fetus and stillborn infant cadaveric dissections, and describes anatomical variations of the peripheral branches of the facial nerve that pose a potential danger in a number of surgical procedure on the face. The branching patterns were classified into six types: the frequencies of occurrence were: type I, 4.9%; type II, 24.4%; type III, 34.1%; type IV, 19.5%; type V, 12.2%; and type VI, 4.9%. Types II, III and IV together accounted for almost 80% of the specimens. In the discussion we compare the results of the present study with those of others and try to clarify the anatomical characteristics of the facial nerve in infants, which demand that special attention be paid to the avoidance of injuries during facial surgery.