FA/MA 방법에 의한 부산시 부유분진의 오염원 할당

정장표, 이승훈, 윤항묵 경성대학교 환경문제연구소 2000 環境硏報 Vol.10 No.1

The object of this study was to identify source categories of Busan area through FA/MA methodology which contribute to the concentration of suspended particles at receptor. According to the purpose of this study, twenty-seven chemical species such as elements, anions, and total carbon of chirty-six PM10 and TSP data sets sampled at Bumchun receptor site for a 24hr period from May to Aug. 1992, were analyzed and applied to FA/MA model. From this study, the following conclusions were obtained. From the factor analysis for measured data, steel, mill-related, transportation, soil dust resuspension, marine, fuel oil, secondary aerosol source, and etc., of which total variance explained by the identified factors was calculated as 84 ∼ 91%, were identified. And the trend was shown that the more the number of input trace materials was, the more difficult the identifications of factors were, relatively. Selecting the representive tracers for identified factors based on the factor loadings, the following equations were obtained by use of stepwise method in multiple linear regression for the cases. TSP(㎍/㎥) = 27.996+0.033Mg +0.016Cl-+0.O05SO42 Case 1 TSP(㎍/㎥) = 11.779 + 2.013Ti + 0.034Na + 0.026Mg + 0.006ca Case 2 PM10(㎍/㎥) = 3.130+0.O04 SO42 +0.010 Cl- + 1.812Ti Case 1 PM10(㎍/㎥) = -14.028+1.515Ti +0.D38Na + 0.O09 Cl- + 0.003 SO42- Case 2 In comparison with the results of FA/MR model with the change of the newly added input tracers, the case with TSP showed relatively unstable results of factor analysis for the case studies because of insufficient number of data available to complete a factor analysis for the tracers used.

인슐린 비의존형 당뇨병 환자에서 당뇨병성 신증의 지표로서 혈청과 요Ⅳ형 collagen의 의의

장태종,최병진,반금진,노영호,김소연,조민구,이권전,김윤권 대한신장학회 1996 대한신장학회잡지 Vol.15 No.4

영구자석의 체적 변화가 자력에 미치는 영향

장항익,황현식 대한치과교정학회 1995 대한치과교정학회지 Vol.25 No.2

교정치료시 보다 효과적인 치아 이동을 위한 한 방법으로 최근 자석 사용이 고려되고 있다. 영구자석의 체적 변화가 자력에 미치는 영향을 파악하고자 한 쪽에 한 개의 자석을 고정하고 반대쪽 자석의 두께나 넓이를 일정한 비율로 증가시키면서 양측 간에 나타나는 자력을 비교 연구한 결과 다음과 같은 결과를 얻었다. 1. 두께를 증가시킨 경우에는 자력이 증가하였으나 넓이를 증가시킨 경우 자력이 오히려 감소하였다. 2. 체적 증가에 따른 자력의 증간은 대수함수 분포 양상을 나타내었다. 3. 두께 증가로 체적을 변화시킨 경우, 같은 두께라도 처음부터 크게 제작한 자석이 작은 자석을 여러 개 합한 것보다 큰 자력을 보였다. 본 연구 결과 구강내에서 자력을 증가시키기 위해서는, 마주보는 자석면은 같게 유지하면서 넓이 증가보다는 두께를 증가시키는 방법이, 그리고 처음부터 두꺼운 자석을 사용하는 것이 보다 효율적임을 알 수 있었다. Recently, magnetic forces are considered as a method for more efficient tooth movement. The purpose of this study was to evaluate the effects of the changes of the magnetic volume on the magnetic forces. The universal testing machine and the electronic balance were used for the exact measurement of the force with constant air gap. While the magnet was kept same on one side, the magnetic volume of the other side was increased gradually in four manners. In the first group, the thickness was increased by adding same size of the magnets on after another while the thickness was increased by changing with a thicker magnet gradually in the second group. In the third group, the width was increased by adding same size of the magnets while the width was increased by changing with a wider magnet gradually in the last group. The results were as follows : 1. With the increase of the thickness, the magnetic force increased, while the magnetic force decreased with the increase of the width. 2. The magnetic force according to the change of the magnetic volume showed the distribution of the logarithmic function. 3. An originally thick magnet showed larger force than the added magnets although both of them had same volume.

흡수에서 합성수지 충전물(Nor-Pac, 25mm)로부터 분리작용의 연구

김장호,김재홍,김종수,김형호 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1

This study was carried out to demonstrate the superiority of used packing in view of energy saving and efficiency of mass transfer, comparing with conventional packing. The results are as follows 1. Owing to low pressure drop under high load, 25mm NSW-ring, pp. can cause energy saving. 2. The unique magnitudes of used packing are as follows : C_(G) = 5.78 m = 0.67 n = 0.46 3. Used packing can make high efficiency including energy saving because of low pressure drop per the number of transfer unit. To rate the characteristic of packing, it should be carried out that the measurement of pressure drop per packing height and per the number of transfer unit. This study demonstrated the superiority of used packing by caning out above experiment and could be used as basic reference for design and predicting efficiency of packing tower which is filled with same packing.

Nylon 6 fiber media를 이용한 Biofilter의 VOCs(Toluene)의 제거

김장호,최동훈,김종수,김형호,장봉수 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1

This study was investigated the application and kinetics of biofiltration using cometabolic process to remediate gaseous toluene that are highly recalcitrant to adsoption and biodegradation. Biofiltration was successfully applied to treat amixture of volatile organic compounds(Toluene) from contaminated air stream. Immobilized Ps.oleovorans biofilter was evaluated for its value in simultaneous removal of Toluene from waste air stream. In the loading rate (1,000ppm) and space velocity(1,200hr). the average removal efficiencies of Toluene were 33.7%. and CO2 production rate were 5.28㎎/hr

n-ITO/p-PSL 이종 접합형 광검출 소자의 제조

r김항규,신장규,이종현,신용현,김현태 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1

Porous silicon photodetectors with a vertical n-ITO/p-PSL heterojunction structure have been fabricated. From I-V characteristics of fabricated devices with white light from 0 to 3000 Lux, we find that the photocurrent varies linearly with incident light intensity. The transparent ITO affords light emission through the top surface of the device, as well as providing passivation and hence long-tens stability.

씨름 들배지기 기술의 키네메틱 특성분석

김의환,홍장표,우성돈,정재욱 龍仁大學校 武道硏究所 2001 武道硏究所誌 Vol.12 No.1

The purpose of this study was to analyze the kinematic variables Dul-baejiki, the most frequently used and crucial technique in Ssireum(Korean Traditional Westling) with 3dimensional analysis technique and show the kinematic characteristics of it. The subjects of this experiment were two best skilled players who have been plying in professional Ssireum team and whose weights are over 100kg(subject A) and under 100kg(subject B) each. Kinematic variables analyzed here include time, posture, and center of gravity. The mean values and the standard deviations for each variables were variables were obtained and used as basic factors for examing characteristics of Dul-baejiki motion From the data analysis discussion, the following conclusions were drawn: 1) Temporal variables The average time elapsed(TE) by phases of Dul-baejuki motion are the following. For subject A(over 100kg), TE during 1st phase was 0.69 sec(53.5%), TE during 2nd phase was 0.44 sec(34.1%), TE during 3rd phase was 0.16 sec(12.4%). For subject B(under 100kg), TE during 1st phase was 0.69 sec(55.6%). TE during 2nd phase was 0.36 sec(29.1%), TE during 3rd phase was 0.19 sec(15.3%). In the TE by phases of both subjects, the longest TE was the 1st phase, next the 2nd phase, and then the 3rd phase. 2) Center of Gravity(COG) variables Frontal Plane for both subjects showed a continuous movement rightward from pulling phase to falling phase. For Sagital Plane, subject Q moved backward in pulling phase, but subject B moved 6 cm forward until falling phase and then moved backward. For Height, subject A was situated 87.3 cm ∼106.7 cm high from the mat from initial phase throughout falling phase, subject B was situated 75 cm ∼97.1 cm.

민간부문 건설사업관리 활성화방안

이정희,장홍진,구교진,김옥규,현창택,김양현 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1

Since, korean government introduced Construction Management system by the law in 1997, only a few public construction projects have been adopted the system Nevertheless there are many laws which are related in public construction projects, Construction Management is positively carried out by non-government. About the activation plan of Construction Management questionnaire was inquired by experts in construction. The purpose of this study is to give a solution by finding out the problem of the laws, reconstructions remodelings.

움직임 영역간 블록 정합을 이용한 반복적인 움직임 검출

고봉수,김장형 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.2

IThis paper presents the motion detection algorithm that can run robustly about recusive motion. The existing motion detection algorithm that uses difference image is robustly in some degree brightness or noise, developed a motion detection algorithm using mean absoulte error(MAE) which calculates the set of Moving regions and performs block matching. The experimental results revealed that our approach is superior to existing methodolgies to handling various temporal clutter.

실리콘 이온주입 SiO_2층의 나노결정으로 부터의 광루미네센스

김광희,오항석,장태수,권영규,이용현 한국센서학회 2002 센서학회지 Vol.11 No.3

실리콘 기판 위에 형성한 열산화막에 실리콘이온을 주입하고 열처리를 수행한 후, 광루미네센스(photoluminescence:PL) 스펙트럼을 조사하였다. 실리콘 이온도즈의 변화와 열처리 온도의 변화에 따른 PL스펙트럼을 조사하고, 이를 TEM과 XRD 데이터와 비교하여 분석한 결과, 광루미네센스 특성은 산화막내의 실리콘 나노결정으로부터 기인함을 알 수 있었다. 또 산화막을 1분 간격으로 습식 식각하면서 매 식각 시마다 PL스펙트럼을 관측하여 그 변화를 조사하였다. 이러한 실험을 통하여 산화막내에 분포하고 있는 실리콘 나노결정의 크기와 그 수가 PL피크 파장과 강도에 직접적으로 영향을 줌을 알 수 있었다. Photoluminescence(PL) properties of Si^+ -implanted SiO_2 film, which was thermally grown on c-Si substrate, is reported. We have compared room temperature photolurninescence (PL) spectra of the samples which was made in several kinds of implantation, subsequent annealing and SiO_2 film thickness. XRD data was correlated with the PL spectra. Silicon nanocrystals in SiO_2 film is considered as the origin of the photoluminescence. PL spectra was investigated after wet etching of the SiO_2 film by using BOE (Buffered Oxide Etchant) at every one minute. PL peak wavelength was varied as the etching is proceeded. These results indicate that the quantity and the distribution of dominant size of Si nanocrystals in SiO_2 film seem to have a direct effect on PL spectrum.