지역별 특성에 따른 대기오염지수 기준 산정을 위한 통계학적 자료분석

백계진,정원삼,신대윤 한국대기환경학회 2004 한국대기환경학회 학술대회논문집 Vol.- No.-

철도교통소음의 수평·수직적 전달 및 감쇠 특성

최형일,정원삼,김난희,강영주,위환 조선대학교 환경공해연구소 2006 環境公害硏究 Vol.19 No.1

This study has been conducted to achieve the following objectives: First, in order to understand the horizontal propagation and attenuation characteristics for the railroad traffic noise, we selected actively developed areas within 100 meters away from the road to measure the level of traffic noise near a road. To measure the noise near a railroad, we selected areas within 100 meters away from the railroad and then selected Saemaul-ho and Mugoongwha-ho as the subjects for our experiment, In this way, we analyzed the horizontal propagation and attenuation characteristics for the traffic noise occurring in diversified areas. Second, in order to understand the vertical propagation and attenuation characteristics for the railroad traffic noise, we measured and analyzed the distributional characteristics of vertical sound pressure levels on each floor of multi-storied apartment buildings according to changes of traffic load and types, and the existence or nonexistence of soundproof walls. For the case of the railroad traffic noise, we also selected Samaul-ho and Mugoongwha-ho as the subjects for our experiment, and we measured and analyzed the different noise levels on each floor of multi-storied apartment buildings from the soundproof wall. The results of Horizontal propagation and attenuation characteristics for the railroad traffic noise are as follows: In cases of the flat land, cutting land, and bridge area, as distance increases, the sound pressure level steadily decreases. The cutting land has an especially high distance decrease compared to the other areas, and the sound pressure level for the bridge area is higher than that of the flat land with a measurement of 9.7~17.5㏈(A). Vertical propagation and attenuation characteristics for the railroad traffic noise are as follows: The amount of sound pressure level decrease is 13.9~15.4㏈(A) for Samaul-ho and 10.9~11.5㏈(A) for Mugoongwha-ho when measuring the vertical sound pressure levels at heights lower than 4.5m, which indicates a fairly large decrease. At 6m, the amount of decrease is 7.3㏈(A) for Samaul-ho and 5.0㏈(A) for Mugoongwha-ho, which indicates a small decrease.

D-64 : The Effects of Coagulation Process for the reuse of Gwangju Sewage Effluent

이대행,정원삼,김난희,민경우,서희정,백계진,김찬중,문희 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2

Water quality in Gwangju sewage effluent was investigated for water reuse during the period of Jan 2003 to June 2004. Alum and poly aluminium chloride (PACl) as coagulants were used to reduce color, turbidity, total phosphorus (TP) and total organic carbon (TOC) in sewage effluents. Monthly mean values of BOD, SS, turbidity, total phosphorus and color in 2003 were 4.1 mg/L, 2.9 mg/L, 0.9 NTU, 1.3 mg/L, and 24.8 unit in sewage effluent, respectively. Jar-test was executed to investigate the removal effects of color, turbidity and TP in the effluent under the coagulation condition of 5 minute fast mixing, 15 minute slow mixing and 1 hr precipitation. Alum with 8% Al2O3 content showed optimum removal rate of 65 % for turbidity and 97 % for dissolved (D) TP with 100 mg/L dosage. However the removal of dissolved color (DC) increased in proportion to the coagulant dosage reaching up to 300 mg/L. PACl with 10% Al2O3 content showed somewhat same tendency in the removal of DC and DTP, except for turbidity. The optimum removal range was widely distributed from 80 mg/L to 220 mg/L when PACl was used as coagulant. This result will be applied for setting optimum operating conditions for Coagulation/Membrane hybrid system.

아파트의 騷音·振動 調査 에 關한 硏究

최형일,정원삼,박싱일,김난희 조선대학교 환경공해연구소 2004 環境公害硏究 Vol.18 No.-

With improvement of the social life, noise and vibration, two of the habitat factors occurring in apartment buildings, gradually become more of a social problem. Causes of the pollution and its propagation paths are investigated in this study and counter measures are proposed to reflect at the early stage of planing and design through a case study for future apartment building design. Noise and vibration caused by the mechanical facilities of the apartment building are measured. The conclusions of this study are as followings. 1. The major causes of noise and vibration are combustion gas and heating apparatus, respectively. Noise and vibration may be delivered to the households by a complex process of the facilities. 2. To reduce the noise and vibration, countermeasures for propagation paths are provided and the estimated reduction of noise and vibration is presented in this study. 3. The building floors in this study are made of light-weight prefabricated concrete slab. Its isolation capacity of a crashing sound is L-80. This is the average level within 17 buildings made of light-weight forming concrete.

The Effects of Coagulation Process for the reuse of Gwangju Sewage Effluent

이대행,정원삼,김남희,민경우,서희정,백계진,김찬중,문희 한국공업화학회 2004 한국공업화학회 연구논문 초록집 Vol.2004 No.1

수영장하수 중수도 활용방안 연구

최형일,백계진,정원삼 조선대학교 환경공해연구소 2004 環境公害硏究 Vol.18 No.-

We investigated water quality and quantity about 7 sites of Indoor Swimming pool to analyze economic or not when we recycled the sewage of swimming pool. we analyzed the sewage water quality in the laboratory, researched the documents for the economic analysis data when we introduced the water recycling system and investigated the water using volume and cost on the site of swimming pool from directly hearing. The results are as follows : 1. Water quality of indoor swimming pool sewage is BOD 10.8~25.0㎎/ℓ, COD 20.0~26.1㎎/ℓ, Therefore COD/BOD ratio is 1.4. 2. It was analyzed that highly economic value swimming pool is C.T, S.L, H.Y, H.D in respective circulation method and K.J, C.T in areal circulation method when we introduce the water recycling system. 3. The inducement policy of introducing water recycling system for the user of large amount of underground water is like this ; The more discharge the sewage, the more charged the sewage fee.

Propofol 과 Enflurane 마취시 혈중 Catecholamine 농도 및 심혈관계 반응의 비교

김용일,임경준,기삼서,정원서,소금영,정종달 대한마취과학회 1996 Korean Journal of Anesthesiology Vol.31 No.2

Background: Surgical trauma is a potent stimulus for the neurohormonal axis. The catecholamine response to surgical stress may be modulated by the anesthetic regimen utilized. We compared the hemodynamic response and cateeholamine concentration to lower abdominal surgery during anesthesia with propofol or enflurane. Methods: Forty six patients undergoing lower abdominal surgery were assigned randomly to two groups. In group I, anesthesia was induced with thiopental sodium 5.0mg/kg and maintained with enflurane-N₂O. In group II, anesthesia was induced with propofol 2.0mg/kg and maintained with propofol 12mg/kg/min by infusion pump. Hemodynamic responeses were recorded at tracheal intubation. Blood samples for later determination of plasma catecholamine were drawn and hemodynamic responses were recorded at preinduction, 1 minute after skin incision, 30minutes after skin incision. Results: There was no statistical significance in systolic and diastolic pressure between two groups. There was statistical significnce in heart rate 30minutes after skin incision between two groups. There was no statistical significance in epineprine concentration between two groups. There was statistical significance in norepineprine 30 minutes after skin incision between two groups. Conclusion: Propofol may be useful alternative at lower abdominal surgery and it may be convenient and safe intravenous anesthetics.

사격장 소음에 관한 연구

최형일,정경훈,정원삼,박싱일,김난희 조선대학교 환경공해연구소 2006 環境公害硏究 Vol.19 No.1

These days, the way of life and peoples' values have been changing in a developing society. The noise pollution in residential areas is a serious problem caused by the drift of population to cities, increased density, and heavy traffic. The firing ranges, which were built 20 or 30 years ago, are required facilities but are threatening to people. They are a source of anxiety as they jeopardize the residents' safety and destroy their living. Because of this, problems arise often. To reduce the problems between the residents and the military, the sound level around the firing range, the location of the range, and training times are investigated as the following 1. When a howitwer is fired, if there is no obstacle, at distances of 70m and 120m, the equivalent noise level is +116㏈(A)Leq and 98.6㏈(A)Leq, respectively. When the distance is 120m, the maximum sound pressure level is 123㏈(A)Leq for a period of one second. 2. When a 105mm howitwer is fired, if there is a hill as a natural sound barrier and the distance between the firing location and the target location is far more than 900m. the equivalent sound level is below 62㏈(A)Leq. 3. Upon firing, the sound pressure levels have equal range. The sound level is higher at 500Hz and lOOOHz. 4. The sound pressure level of the noise of explosive sound decreases between the shooting point and the target point. At distances of lOOOm, 1400m, and 1450m, the equivalent sound levels are 86.2㏈(A)Leq, 85.4㏈(A)Leq and 84.2㏈(A)Leq each, and the highest sound pressure levels are 121.4㏈(A)Leq, 116㏈(A)Leq and 114.3㏈(A)Leq for one second. 5. The explosive sound at the target point is similar to the noise at the firing point. The sound pressure level also has an equal range. Also. the sound level is higher at 500Hz and 1OOOHz than the others.

초소형 전기차용 중공형 P-EPS에 관한 연구

이상준(Sangjun Lee),정원삼(Wonsam Jung),배도제(Doje Bae) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7

This study on a hollow type pinion electric power steering system using a high voltage of a Micro Electric Vehicle. A study was conducted on the design of applying a high voltage source of an electric vehicle to the circuit as it was, and developed a steering control logic for the Micro Electric Vehicle. This study is the result of verifying the applied data of high voltage source and the Micro Electric Vehicle electric power steering system different from the existing electric power steering system using the simulator.

무등산 편백림의 기상인자에 따른 테르펜 발생

김민희,진승현,백계진,정원삼,이대행,안기완 한국산림휴양학회 2012 한국산림휴양학회 학술발표회 자료집 Vol.2012 No.4