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.

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.

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.

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.

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.

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.

xTiO2 - y SiO2 광촉매에 의한 유기물의 광분해

양천희(Chun Hoi Yang),이철우(Chul Woo Lee),홍필선(Phil Sun Hong),이원묵(Won Mook Lee) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.1

TiO₂ and x TiO₂- y SiO₂ 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 were measured. Considering the efficiency of the ethanol and phenol degradation using the catalyst, the conclusions were obtained as follows: ①. By means of X-ray analysis of TiO₂ powder that is obtained from water and 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. ②. xTiO₂- y SiO₂ system photocatalysts were developed from Titanium and Silicon alkoxide by a hetero-condensation process. The increase of SiO₂ contents causes the decrease of the degree of crystallization of the gel, whereas the specific surface area preferentially increases. It is shown that more than 90% of ethanol and phenol are degraded when reaction time is about three and an hours, and the maximum degradation rate of ethanol and phenol is shown in 60TiO₂-40SiO₂ catalyst.

LaCoO3 산화물의 에탄올 감지특성에 미치는 CaO 의 영향

양천회,임병오,손태원 한국산업안전학회 1988 한국안전학회지 Vol.3 No.2

The perovskite-type compounds La(1-x)Ca_xCoO₃ were synthesized, their thermochemical properties and the gaseous sensitivity were investigated in ethanol vapor. The maximum response for detecting gas corresponded with the exothermic peak of DTA experiment. In any case the substituent was increased, the responsive ratio for detecting gas was grown upon, However, the needed time for response was later, and the operating temperature was elevated. The mechanism of this electrical conductivity was explained by the oxygen ionic diffusion through oxygen vacancy produced by the substituent.

Sol - Gel 공정으로 Plastic 표면에 Glass 박막 제조에 관한 연구

양천회 한국산업안전학회 1998 한국안전학회지 Vol.13 No.1

Sol-gel derived silica films were prepared by dip-coating onto polymethylmethacylate with Tetraethoxysilane(TEOS) as starting materials. Film properties such as viscosity and thickness were investigated as a function of dip speed, waterprecursor ratio, sol aging time. IR spectra of the gel films prepared from TEOS at various R are given. At small values of R the absorption peaks assignable to C-H vibration in -OC₂H_5 groups are observed around 3000 and 1500-1300 ㎝^(-1). These bands indicate that the -OC₂H_5 groups are retained in the gel at small values of R because of incomplete hydrolysis of TEOS. Film behaviour was interpreted in terms of the dependence of hydrolysis and condensation rates on the interplay between sol pH and waterprecursor ratio. Film thickness was found to increase by approximately a factor of two as waterprecursor ratio increased from two to six. Film thickness also increased with sol prepolymerisation time. Surface quality was correlated with processing conditions.