납동위원소비법에 의한 영광 수동유적 청동기의 산지추정

강형태,정광용,이기길 호남고고학회 2002 湖南考古學報 Vol.15 No.-

본 연구는 전남 영광군 화평리 수동마을 움무덤에서 출토된 새무늬 청동기 및 본뜬거울(방제경)을 주조하기 위해서 어디에서 원료를 가져다 썼는지 그 산지를 추정한 결과이다. 청동기의 원료산지를 추정하는 방법중의 하나로서 납동위원소비법을 사용하였다. 즉, 청동기에 함유된 납의 동위원소비를 분석한 다음 기 확보된 한국·중국·일본 방연광의 납동위원소비 분포도를 비교하여 어느 군(group)에 소속되는지를 살펴보았다. 또한 다변수분석법중 선형판별식분석으로 작성한 방연광 분포도를 사용하여 위의 결과와도 잘 일치하는지를 확인하였다. 납동위원소비 분석결과 새무늬 청동기는 중국 북부산 방연광 분포 범위에 포함되었는데 이는 선형판별식분석 결과와도 일치하였다. 본뜬거울은 중국 남부산의 방연광에 속하는 것으로 생각되나 한국 남부산 방연광 일부와도 인접해 있어서 명확하게 판단하기에는 어려움이 있다. 또한 위의 결과를 종합하면 동일 움무덤에서 출토된 청동기이지만 원료의 출처는 서로 다르다는 것을 반영하고 있다. 청동기 원료의 산지추정을 위해서는 성분조성비 분석도 함께 이루어져야 하나 대부분 부식되어 분석이 불가능하였다. 그러나 이들 납동위원소비 데이터는 차후 호남 문화권의 청동기연구에 있어서 좋은 참고 자료가 되리라 판단된다. Five lead isotope ratios(206/204, 207/204, 208/204, 207/206, 208/206) of two bronze artifacts excavated from Sudong site, Youngkwang-gun were analyzed by TIMS(thermal ionization mass spectrometer). Their lead isotope ratio data obtained were compared with those of galena of Korea, Japan and China, which data were being used for reference raw material data set. And multivariate mapping method such as statistical linear discriminant analysis(SLDA) was applied to classify the sources of raw materials. The lead isotope data of bronze artifact decorated with bird design was included in the area of galena of northern China and this result was accorded with SLDA result. Imitated bronze mirror was of southern China but very difficult to differentiate with area of south Korea. Consequently, the result of lead isotope ratios of two bronze artifacts suggested that the sources of raw materials were different origin each other.

Chlorhexidine의 사용 방법에 따른 치은염 억제 효과의 비교 연구

최종길,신형식 圓光大學校 1991 論文集 Vol.25 No.2

Rinsing with a chlorhexidine gluconate was the most effective chemical method of controlling method dental plaque and gingivitis. The purpose of the study was to determine the effects of different delivery method of chlorhexidine to regulate gingival inflammation. 20 subjects participated in 3 weeks, and recruited for 2 groups. Following a baseline examination, one group was rinsed twice a day and the other was sprayed into the teeth with gingiva twice a day. Examination regarding plaque index(Silness & Loe), gingival index(Loe & Silness) and papillary bleeding index(Saxer & Muhlemann) was performed after 3 weeks. The results were as follow: 1. There was no significant difference between mouthwash and spray in all 3 indicies. 2. In the mouthwash and spray group, all 3 indicies was significantly reduced at week 3.

PFC를 적용한 AC/DC 승압형 컨버터 설계

백형래,박수강,최연옥,한엄용,이성길 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1

Single-Phase diode rectifiers are widely used in industry. These rectifier, however, generate many harmonic components in the AC Power line and have the poor input power factor, which may create a power quality problem for other electrical apparatus in the vicinity of the rectifier. Power factor improvement and harmonic reduction in the AC line current have become very significant problems in single-phase diode rectifiers. In this paper, the high power factor boost converter using soft switching is proposed to improve the demerit. The simulation results show the validity of the proposed system.

인버터식 X-선장치의 맥동률에 따른 출력특성 연구

이성길,백형래 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1

This paper deals with the output characteristics of resonant PWM inverter type X-ray generators connected to different DC power units i.e, a single phase full bridge rectifier. a three phase full bridge rectifier and a power storage unit(PSU). The quality of X-ray beam depends on the pulsating waveforms of DC voltage supplied to the X-ray tube. In a X-ray generator, the waveform of DC output voltage can be affected from harmonic distortion of DC input power. When a tube voltage waveform is distorted, the property of X-ray beam such as reproducibility, linearity and dose can be reduced. Therefore, this paper compared DC output waveforms and dose with three type of DC power units and show the experimental results in this paper.

교대근무와 수면 : Sleep Pattern of Psychiatric Nurses on Two-Daily Phase Delay(Day/Evening/Night) Rotating Shift Schedule 2일 간격 지연상(주간/저녁/야간)의 순환교대근무제로 일하는 정신과 간호사의 수면양상

이형영,김원길,윤진상 大韓神經精神醫學會 1991 신경정신의학 Vol.30 No.2

The rapid industrialization is associated with an increase in shift systems. Sleep problem is a major complaint of shift workers. This study was undertaken as one of a series of researches on shift workers and sleep. The purpose was to understand the sleep pattern and to offer basic data in order to improve a sleep regimen. The sleep log was administered to a relatively homogenous group of 38 psychiatric nurses who were on the two-daily phase delay(day/evening/night) rotating shift schedule. Some possible influencing factors to sleep pattern(age, sex, marital status, work duration, drug use, and physical and psychiatric diseases including sleep disorders) were controlled. The sleep measures were main sleep(starting time, latency, number of awakenings, length and subjective quality). Each measure was analyzed and compared accross the rest times at which the workers can take sleep and nap. Also, the possible relationships between the main sleep(quality and length) and naps(number and length) were analyzed. The following results are based on the data of 33 of the 38 subjects. Five of the subjects who did not sleep during the rest time after the second night shift were classified seperately. 1) The beginning of the main sleep phase was delayed during the rest times after day, evening, and night shift, while advanced during the rest times after days off. 2) The sleep measures were significantly different across the rest times; for latency(F(7.224)=2.12, p〈.05), quality(F(7.224)=8.97, P〈.001), length(F(7.224)=41.13, p〈.001) of main sleep, and number of nap(F(7.224)=19.27, P〈.001) and length of nap(F(7.224)=12.79, P〈.001). The main sleep taken in the day time after night shift was generally poorer quality and shorter length than that in the night time after day and evening shifts and days off. Nap was relatively longer and more frequent during the rest time after night shifts than during the rest time after day and evening shifts and days off. 3) There were significantly negative relationships between the total length of main sleep and total number of nap(r= -.3632, p〈.001) and between the total length of main sleep and total length of nap(r= -.2253, P〈.001) across the rest times.

Neural Oscillator를 이용한 강인한 피치추적에 관한 연구

임성길,김형호 대불대학교 2002 論文集 Vol.8 No.1

This Paper treats on the Method for robust pitch tracking on neural oscillator. We used the method which was modified LEGION(Locally Exitator Globally Inhibitory Oscillator Network) algorithm for neural oscillator. The proposed pitch tracking method was evaluated on a man and woman's clean voice which was recoded in the lab and news reporter's voice which has noice signal.

SO₂와 NOx 동시제거를 위한 흡수제의 반응특성

이형근,최원길,박영성 大田大學校 環境問題硏究所 1997 환경문제연구소 논문집 Vol.2 No.-

Recently the more stringent emission standards of government promulgate the incentive for developing the technology capable of simultaneous removal of SO₂ and NOx from flue gas. This study was to develope an enhanced absorbent in reactivity and adsorption ability for removing SO₂and NOx from flue gas. The characteristics of spray drying absorption(SDA) process and status of SDA process were studied, as well as analysis of properties of absorbent and its manufacturing method. CaO, MgO, and NaHCO₃were selected as a alkali reagent, and they were mixed with fly ash(FA) or activated carbon powder(AC) and their the reactivity and adsorption ability toward SO₂and NOx were greatly enhanced through got water curing process. Among the highest. The surface area of MgO mixed with FA(30%) was greater than NaHCO₃, but the SO₂and NOx removal performance of MgO mixed with FA(30%) was much lower than that of NaHCO₃. The removal quantity of SO₂and NOx per mole of NaHCO₃mixed with FA(30%) was 2.7 mole, this meant that the effect of physical adsorption was greater than chemical reaction between absorbent and acid gases.

非晶質 As_3-Te_6-Ge_1 膜의 光吸收

鄭吉煥,李亨宰 全北大學校 文理科大學 1976 論文集 Vol.4 No.-

Absorption coefficients have been investigated on vitreous As_3-Te_6-Ge_1 films prepared by vacuum evaporation in an affort to provide information about the state distribution at the valence band edge. Energy range of 1.5~2.0ev gives the the absorption characteristics described by direct band-to-band transitions, and shows the density of states given by an eguation N(E)=N_O E^1/2. The state in the lower energy range is approximately explained by both exponential and Gaussian distribution, N(E)=N_O exp(E/△) and N(E)=N_O exp[(-E-E_m)^2/△^2] respectively.

公共投資事業과 環境影響評價를 위한 理論模型

안형기,박용길 건국대학교 사회정책연구소 1999 사회과학연구 Vol.12 No.-

Mirizzi 증후군의 변형된 분류와 치료

김형철,강길호,채만규,김성용,백무준,이문수,박상흠,이문호,김창호,송옥평,조무식,박희주 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1

Purpose : The Mirizzi syndrome is relatively rare and preoperative diagnosis of this disease is difficult. In 1978, Morelli suggested the subclassification of the Mirizzi syndrome into acute or chronic form. We experienced 5 cases of acute form. We analysed clinical features, preoperative radiologic findings and operative findings of 18 cases including acute forms which were diagnosed as Mirizzi syndrome and should suggest the modified classification of Mirizzi syndrome for choice of appropriate treatment. Method : From January 1995 to December 1998, 18 cases, of which 8 cases were diagnosed at Soonchunhyang University Chunan Hospital, and 10 cases were reported in the Korean Journal were retrospectively analysed with regard to clinical features, preoperative radiologic findings and operative findings. According to the clinical features, whole cases were divided into type Ⅰ(acute form) and type Ⅱ(chronic form) and then each type of cases were subclassified according to preoperative radiologic findings and operative findings. Results : Of 18 cases there were 5 cases in type Ⅰ(27.8%), 13 cases in type Ⅱ(72.2%). Type Ⅱb was most common. Type Ⅰa cases were treated only with cholecystectomy. We applied cholecystectomy, T-tube choledochostomy and patch technique in type Ⅰb and thpe Ⅰc cases. Cholectystectomies including removal of gallstones and internal drainage procedures were done in type Ⅱ chronic forms. Conclusion : The acute form(Type Ⅰ) of Mirizzi syndrome was suggested by Morelli might be subclassified into typeⅠa,Ⅰb and Ⅰc following the presence of the necrotic defect in common hepatic duct. Through the modified classification of Mirizzi syndrome based on clinical feature, preoperative radiologic findings and operative findings, we can choice appropriate treatment.