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최소자승법을 이용한 다수 베타 방출 핵종 혼합물의 방사능 분석
선광일,남욱원,공경남,김창규,이동명,이상국 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.4
베타선 스펙트럼의 최대 에너지가 확실하게 구별되는 2개의 핵종만을 포함하는 혼합시료의 경우에는 최대 에너지가 다르다는 점을 이용하여 손쉽게 각 핵종의 방사능값을 측정할 수 있다. 그러나 3개 이상의 베타 방출 핵종이 포함된 혼합물에 대해서는 각 핵종의 스펙트럼이 서로 겹치기 때문에 이러한 방법으로 구해진 방사능값은 신뢰도가 떨어지게 된다. 따라서, 본 연구에서는 최소자승법을 이용하여 혼합물의 중첩된 베타선 스펙트럼을 각각 분리 정량분석할 수 있는 밥법을 제시하였다. 또한, 실제로 4개의 베타 방출 핵종 ^3H, ^14C, ^16Cl, 90Sr)이 혼합된 사료를 조제하여 본 분석법을 검증한 결과 최고치 Reference value)와 분석치가 7% 이내에서 잘 일치함을 보였다. It is possible to count and perform quench correction on two β-label samples so long as the maximum β-energies are sufficiently different. However, when the coventional technique is applied to the radioassay of a mixture of more than three nuclides, the reliability of the activiteis determined is considerably reduced, resulting from the large overlapping of liquid scintillation pulse height distributions of ezch nuclide. A technique that allows the activities of multiple β-labeled samples to be radioassayed was proposed by using the least square method. The technique was applied to mixture samples of ^3H, ^14C, ^16Cl, and ^90Sr. The analytical values were in good agreement with the reference values within 7% relstive error.
이광만,고성택,김영민,고희선 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.1
A micro-vacuum sensor has been fabricated by using silicon micromachining techniques and platinum thin film. NON insulator was deposited by LPCVD and APCVD methods. The insulator diaphragm was fabricated by silicon anisotropic etching in TMAH solution. Thin film platinum heater and temperature detector were deposited by rf sputtering method and patterning was performed by means of lift-off method. Deposited platinum heater and temperature detector have been shown a linear I-V characteristics. TCR( temperature coefficient of resistance) of thin film platinum heater and temperature detector was about 0.0042/℃. Fabricated vacuum sensor was measured in the range of 1X 10^(-3) Torr to 1X10^(2) Torr. and shows a good linear operating characteristics in the range of 1x1^(-2) Torr에서 1X10^(0) Torr.
CDMA 시스템의 Ec/Io 개선을 위한 순방향 채널의 전력분배에 관한 연구
김선미,최동유,류광진,박창균 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.2
This study defined the way to distribute power of forward channel and suggested a new model for prediction power in order to minimize the deterioration of call quality and performance in the CDMA mobile communication system of narrow band using 1.2288MHz of narrow band. Each change in Ec/Io was measured for the factors affecting wireless environment(e.g. the changes in power of overhead channel, the changes in a number of call channel, and the increase in interference from the additional facilities of adjacent base station or other systems) to know the influence on the wireless environment of forward link. The new way for power distribution to a base station in operation and its validity was checked by comparing before and after test.
고희선,김영민,권대혁,도양희,이광만 제주대학교 산업기술연구소 1999 尖端技術硏究所論文集 Vol.10 No.2
Silicon micromachining technology can be used to build microsensors and actuators by using tools derived from standard IC processing. For the silicon micromachining the etching characteristics of tetramethyl ammonium hydroxide (TMAH) by dissolving silicon powder or silicic acid have been studied. The 3, 5 and 10wt.% TMAH solutions, with dissolved silicon powder (6g/l) or with dissolved silicic acid(Si(OH)4, 16g/l) were used. And ammonium peroxydisulfate (APODS, 2g/l) dissolved in the solutions were also used. The etch rates of silicon and the etched surface roughness were observed with various etching conditions. The crystallographical aspect on the crystal orientation of silicon have been studied. With sufficiently fresh solutions, these TMAH concentration and combination of etchants, provide repeatable etch properties, does not attack exposed aluminum or silicon dioxode, and provide smooth (100) silicon surfaces.
동시형광 분광광도법에 의한 대기 시료 중의 다환방향족 탄화수소(PAHs)의 분석
유광식,정선이,정지영 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.1
Determination of some PAHs in ambient air at Ulsan have been carried out by collection of the components into n-hexane followed by synchronous spectrofluorimetric technique. 10 PAHs, such as acenaphthene (Ace), anthracene (Anth), benz[a]anthracene (BaA), benzo[b]fluoranthene (BbFt), benzo[k]fluoranthene (BkFt) benzo [a]pyrene (BaP), chrysene (Chry), phenanthrene (Phen), fluoranthene (Ft), perlyrene (Per), and pyrene (Pyr) in air samples were able to determine separately by synchronous spectrofluorimetry. Calibration curves for those components were linear for the concentration range of 0.2∼166 ppb PAHs with the correlation factor of 0.9985∼0.9999. The predominant contribution was phenanthrene which was included 36.9∼85.1% to the overall level of the 10 PAHs in some areas, Also benzo[a]pyrene which was known to carcinogenicity was detected from 6.4 to 55.8 ng/㎥, benzo[a]anthracene of some areas was contained from 21.9∼153 ng/㎥,
도시지역 여자고등학생들의 체형과 체형에 대한 의식 및 자각증상과의 관계
류광하,권인선,김형선,조영채 한국학교보건학회 2008 韓國學校保健學會誌 Vol.21 No.2
Purpose: This study investigated the relationship between body type subjective symptoms and health awareness in female high school students Methods: The subjects were 393 students at the female high school in Taejon City by self-recorded questionnaires in May, 2006. Results: In the classification of body type based on the degree of obesity low weight group was 20.9% normal weight group was 58.0% over weight group was 11.7% and obesity group was 9.4% In the level of body type awareness those who consider themselves to be obesity type 13.7% standard type were 43.8% and leptosomic type 8.1% but there was a clear tendency to be leptosomic type that the rate was 76.3% In the complaint rates of subjective symptoms "fatigue" was the highest followed by "neck pain(stiffness)", "dizziness", "stomachache" in the descending order In the complaint rates of subjective symptoms by the degree of obesity dizziness irregular menstruation and anorexia were higher according to the lower obesity but constipation and wearied eyes were the higher the more obesity Conclusion: The study results showed that the recent female high school students were clear tendency to be leptosomic type and leptosomic and obesity type were related with subjective symptoms Considering these findings it appeared that being excessively thin is related to symptoms and young women's thinness-oriented attitudes are unhealthful.
유치원 아동의 Resazurin Disc검사에 의한 우식활성에 영향을 미친 요인에 관한 연구
조선아,김대업,이광희,양영숙 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.1
The puopose of this study was to analyze the influence of socioeconomic backgrounds and home dental behavior on the caries activity scores by resazurin disc method, 332 preschool children (boys 179, girls 153) in Iksan area were examined for their caries experience and caries activity. The parents of the children were asked to answer the questionnaire about socioeconomic backgrounds and home dental behavior. The sample was divided into five groups according to RD test score. The relationship between each group and a questionnaire was compared and analyzed. The following results were obtained. 1. No significant differences was found for child's age and sex, baby-sitter, sibling rank and tooth brushing frequency among five groups (p<0.05). 2. A statistical significance was obtained in the relationship between RD test score & dft rate (p<0.05). 3. No significant difference was found for parent's age, number of family and mother's physique among five groups (p<0.05). Siginificant difference was found for parent's education level among five groups (p<0.05). 4. No significant difference was found mother's oral hygiene state among five groups (p>0.05). 5. Children sucking human milk had more high RD test score than those who sucking bovine milk (p<0.05).
김광호,김병선 대한건축학회 2004 대한건축학회논문집 Vol.20 No.1
The movement which is trying to evaluate the view as the economic value is happening as well in korea now and these movements are being reflected as it is in social phenomenon than academic world. In Seoul, the ownership of an apartment unit with views of rivers, mountains and something like that are more expensive than the others by US$ 50,000 to US$200,000. And Also many legal disputes take place because of the new buildings blocking the views of the others. Therefore, we develope the method that can objectively evaluate the views in each apartment unit. The studies are being started to solve the points at issues on the evaluation of view by fitting into those tendency and trend lately but clear standard has not been thesis yet. One of problems is to define where the view space and the view point are in the apartment unit. Therefore this study is aiming the purpose of providing the view space and the viewpoint, one of quantitative standards to evaluate the view in the apartment unit. To present the methodology to establish the datum point of view, 1) precedent studies were scrutinized, 2) questionnaire to residents was conducted, 3) the indoor standard space was defined and 4) the visual characteristics in the room were analyzed.
윤재선,최광표,이두성,홍광석 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
In this paper, we present a speech recognition game, "Voice Illust Magic". "Voice Illust Magic" is on-line windows game using speech recognition algorithm HMM. Because this game can be performed by not only the mouse and keyboard but also speech recognition, the users can use the computer easily. The speech recognition process of computer games detects the endpoint of input speech automatically which is received through the microphone and then extracts the feature parameter, Mel cepstrum. The VQ sequences of input speech are compared with the reference models of word unit and the optimal model is selected among reference HMMs. The puzzle games transfer the message of the recognized game command which performs the same operation as the keyboard and mouse into the windows interface. Since input speech is not compared with all reference patterns but the reference patterns of each state, this method can reduce the recognition time and can improve the recognition rate.