원자가 조절에 의한 Cr_2O_3센서의 Trimethylamine 감지특성

양천희 한밭대학교 산업과학기술연구소 1993 논문집 Vol.1 No.-

To develop a new type of semiconductor gas sensors capable of testing freshness of fish, attempts were made enhance the sensitivity to trimethylamine(TMA) by modifying the carrier concentration of metal oxides by means of the valency control method. The TMA sensitivity of Cr_2O_3 was markedly improved by partial substitution with 5mol% Ti^4+ ions for the Cr^3+ sites. These facts suggest that the sensitivity can be enhanced by reducing the carrier concentration of the oxides.

Titania 광촉매에 의한 페놀의 광분해

양천회,홍필선 大田産業大學校 1999 한밭대학교 논문집 Vol.16 No.1

TiO_2 and x TiO_2-y SiO_2 system photocatalysts were developed by sol-gel method based on the change of production parameters, and their structure of crystallization and the specific surface area was measured. Considering the efficiency of the phenol degradation using the catalyst, the conclusion were obtained as follows: By means of X-ray analysis of TiO_2 powder that is obtained from H_2O/Titanium alkoxide with various molar ratios, it is shown that crystal structure of anatase type is a dominating structure and, on the other hand, the structure of rutile also partly exists. The specific surface area is at its maximum value at R=6, which is the molar ratio of water vs. alkoxide, whereas its value goes down as the molar ratio increases. TiO_2-SiO_2 mixed compound photocatalysts were developed from Titanium and Silicon alkoxide by a hetero-condensation process. The increase of SiO_2 contents causes the decrease of the degree of crystallization of the gel, whereas the specific surface area preferentially increases. The maximum degradation rate of phenol is shown in 60 TiO_2-40SiO_2 catalyst.

폐광 광재와 유출수가 주변 토양과 하천오염에 미치는 영향

양천회,고장석 大田産業大學校 1998 한밭대학교 논문집 Vol.15 No.1

This study was investigated the extent of heavy metal contamination in areas of the soil and river by the effluent and abandoned mines in Chung Chong Nam Do. The abandoned mines were Gubong gold mine and Sinsung coal mine. The results were as follows. The concentrations of As and Pb in Gubong mine were 309.2mg/kg and 1163.5mg/kg which is above the soil quality standard. Cd concentration also was 14.70mg/kg which is exceeded warning level. The heavy metal contaminations in the vicinal paddy and dry field soil area were higher than those in coal mine area. However, As concentration was 29.29mg/kg which is exceeded the warning level as of 10.22mg/kg. The river water quality detected shows high Pb, As and Cd in Gubong stream and Cd, Cu and Pb in Sungju stream.

LaFe₁­хMхO₃산화물의 CO산화 촉매 활성 및 감지 특성

林炳五,梁千會,劉一增 弘益大學校 1985 弘大論叢 Vol.17 No.2

Correlation of catalytic activity for the oxidation of CO and sensor response to CO was investigated. The perovskite-type oxides prepared by partial substitution of LaFeO₃with other 3d transition metal M to give LaFe₁_хMхO₃. The catalytic activity of LaFe₁_хCOхO₃(x=0 to 0.2) increase in X, but the highest sensor response was achieved at x=0.1. It was found that the sensor response increased in proportion to the catalytic activity, provided that the apparent activation energy for electrical conduction was unaffected by the substitution.

수소와 산소 분위기에서 SnO₂가스센서의 응답특성

鄭丙求,梁千會 大田工業大學 1992 한밭대학교 논문집 Vol.9 No.1

The sensing mechanism of SnO_2 semiconductor gas sensor was studied by examining, via the reactive sputtering method, the transient response characteristics of conduc- tivity of gas sensor for Hydrogen and Oxygen. The study revealed the following facts ; (1) If atmosphere containing pure air is changed to one containing mixed gas of H_2-o_2-N_2, the speed of change in sensor conductivity is highest in air containing Hydrogen. (2) If atmosphere containing mixed gas of H_2-O_2-N_2 is changed to one containing pure air, the speed of change in sensor conductivity does not vary significantly with the kind and concentration of gas. This fact suggests that the change results from the adsorption of Oxygen onto open sites on SnO_2.

정모두부방사선사진에서 하악골 우각부 영상확대 및 이의 보정에 관한 3차원 CT영상 연구

황현식,,은춘선,황정현,임회정 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.4

두부방사선규격사진은 작은 크기의 방사선원에서 방사상으로 방사선이 퍼져나감으로써 피사체의 확대와 왜곡이 불가피하다는 단점이 있다. 본 연구는 두 장의 방사선사진을 서로 직각으로 촬영한 후 방사선의 기하학적 성질을 이용하여 좌우 우각부간 폭경을 계산할 경우 실제 폭경의 산출이 가능한지 알아보고자 시행되었다. 성인 40명을 연구대상으로 하여 두부자세재현기를 이용하여 측모두부방사선사진과 정모두부방사선사진을 서로 직각으로 촬영한 후 측모사진과 정모사진에서의 확대율을 이용하여 실제 우각부 폭경을 산출한 다음, 계측치 및 산출치를 3차원 CT영상에서의 계측치와 각각 비교 분석하였다. 연구결과 정모두부방사선사진에서 우각부 폭경은, 작게는 7.92 mm 크게는 11.31 mm까지. 평균 9.10 mm의 확대를 보였다. 측모 및 정모두부방사선사진을 이용하여 얻은 우각부 폭경 보정치를 3차원 CT영상에서 얻은 기준치와 비교한 결과 평균 0.14 mm의 작은 오차를 보였으며 통계적으로 유의한 차이를 보이지 않아 측모 및 정모두부방사선사진 촬영 시 두부자세재현기를 이용하여 서로 직각으로 촬영할 경우 실제 우각부 폭경을 계산을 통해 산출할 수 있음을 보여주었다. 한편 이부편위량과 보정오차는 통계적으로 유의한 상관성을 보이지 않아 안면비대칭이 심한 경우에도 본 보정 방법이 유용하게 사용될 수 있음을 보여주었다. Enlargement is an inherent property of X-rays which occurs when straight lines diverge from small a focal spot. The purpose of the present study was to evaluate the valldity of the correction of gonial angle width enlarged on frontal cephalogram, using frontal and lateral cephalograms taken orthogonally from each other. In 40 adult individuals, frontal and lateral cephalograms were taken at a 90℃ angle using the Head Posture Aligner. The angle width was measured on the frontal cephalogram and subsequently, the corrected angle width was calculated using the magnification rate of two cephalograms. Measured and corrected angle widths were compared with the measurement from the 3D CT image. The measurement on the frontal cephalogram showed a 9.10 mm of enlargement on average, ranging from 7.92 to 11.31 mm. Corrected angle width measurement showed a 0.14 mm difference with the 3D CT image measurement, which was not statistically significant. The results of the study indicate that actual angle width can be approached through calculation using frontal and lateral cephalograms taken orthogonally with the help of the Head Posture Aligner. The study also showed that the magnitude of correction error did not show a significant correlation with the amount of menton deviation, and it suggests that the present correction method is valid even in individuals with severe facial asymmetry.

농공단지 조성에 따른 하천 수질관리 대책에 관한 연구 : 충청남도 지역을 중심으로

이원묵,양천회,오재원 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.1

ABSTRACTA study of stream pollution caused by construction of the Industrial Complex in Agricultural Area of Chung Chong Nam Do were described here. The five main results of this studies are summerized.First, since 1988, among the companies moved in the industrial complex area, the number of electric and electronic companies have increased compared with food companies requiring much BOD, This is very desirable to reduce the water pollution.Second, the average Biochemical Oxygen Demand(BOD) of Masan stream was the highest and it was decreased in the order of Yudug, Jo and Jangan stream.Third, although the concentration of heavy metals such as Cd and Cr6+ are not off the limit and the amount of it is small, it is desirable to introduce a chemical process to remove these metals.Fourth, since the wastewater from industrial complex area is the major factor in stream pollution, the laws associated with environmetal protection should be enforced even then if the industrial complex area with food and chemical companies produce wastewater less than 500 ton/day.Fifth, it is required to improve a facilities whicli separate living wastewater from inderstrial wastewater in Kaya-gok and Nojang industrial complex area. A study of stream pollution caused by construction of the Industrial Complex in Agricultural Area of Chung Chong Nam Do were described here. The five main results of this studies are summerized. First, since 1988, among the companies moved in the industrial complex area, the number of electric and electronic companies have increased compared with food companies requiring much BOD, This is very desirable to reduce the water pollution. Second, the average Biochemical Oxygen Demand(BOD) of Masan stream was the highest and it was decreased in the order of Yudug, Jo and Jangan stream. Third, although the concentration of heavy metals such as Cd and Cr^6+ are not off the limit and the amount of it is small, it is desirable to introduce a chemical process to remove these metals. Fourth, since the wastewater from industrial complex area is the major factor in stream pollution, the laws associated with environmetal protection should be enforced even then if the industrial complex area with food and chemical companies produce wastewater less than 500 ton/day. Fifth, it is required to improve a facilities which separate living wastewater from inderstrial wastewater in Kaya-gok and Nojang industrial complex area.

산화법에 의한 N-치환 히드라존의 합성

이기창,권순자,양천회 明知大學校 産業技術硏究所 1983 産業技術硏究所論文集 Vol.2 No.-

In acetone-ammonia system with amines, N-Substituted hydrazone was synthesized by the oxidation of hydrogenperoxide. The results are as follows : 1. The yield of phenylhydrazone was increased and that of azone decreawed with increasing the aniline added. 2. The excess of aniline was unfarorable for preparation of both azine and hydrazone. 3. Similar behavior was observed for t-butylamine to afford acetone t-butylhydrazone and azine, while cyclohexylamine resulted in the exclusive formation of 2-cyclohexyl-3, 3-dimethyloxaziridine.

Poster Session : NO/ROS in Cell Signaling ; Anti-inflammatory effects of the synthetic militarins

( Chun Hoi Kim ),( Young Chul Lim ),( Ho Gyoung Kim ),( Mi Hee Lim ),( Min Kyong Kim ),( Hae Il Park ),( Ki Chul Hwang ),( Jae Mo Sung ),( Tae Woong Kim ) 한국생화학분자생물학회 (구 한국생화학회) 2007 생화학분자생물학회 춘계학술발표논문집 Vol.2007 No.-

톱풀 삽목시기별 적정 육묘일수 구명

임회춘(Hoi-Chun Lim),김정만(Jeong-Man Kim),최창학(Chang-Hak Choi),정동춘(Dong-Chun Cheong),문정섭(Jung-Sub Moon),송영주(Young-Ju Song) 한국원예학회 2009 한국원예학회 학술발표요지 Vol.2009 No.5