논문 : 금속성 응집제와 모노클로라민의 상호작용이 Polyamide계 RO막 성능에 미치는 영향

김경화 ( Kyung Hwa Kim ),홍승관 ( Seung Kwan Hong ),박찬혁 ( Chan Hyuk Park ),윤성로 ( Seong Ro Yoon ),홍성표 ( Seong Pyuo Hong ),이종화 ( Jong Hwa Lee ) 대한상하수도학회 2006 상하수도학회지 Vol.20 No.4

The bench-scale chlorine exposure study was performed to investigate the effect of pretreatment by free chlorine and monochloramine (NH2Cl) on the performance of RO membranes made of polyamide (PA). Feed monochloramination at 2㎎/L did not cause significant productivity loss compared to free chlorine. However, metal coagulants reacted with monochloramine, the PA membrane suffered from a gradual loss of membrane integrity by chlorine oxidation, which was characterized as a decrease in salt rejection. Especially, RO membranes exposed to alum coagulants with monochloramine revealed the salt rejection lower than those exposed to iron coagulants. XPS membrane surface analysis demonstrated that the chlorine uptake on the membrane surface increased and carbon peaks were shifted significantly when exposed to alum coagulants with monochloramine.

혐기성 소화의 동력학적 해석 : 有機酸 構成比에 따른 嫌氣性 消化 Anaerobic digestion with Component ratios of organic acids

노기현,장성호,안종수,전기일,김수생 동아대학교 환경문제연구소 1994 硏究報告 Vol.17 No.2

This research on organic acid and its component ratio (H_(AC) : H_(pt) : H_(Bu)) mainly produced in acid formation steps of anaerobic treatment process. From comparing the above experimental results with digestion efficiency of acetic acid used as substrates, I can find the conclusion as follows : 1. Removal efficiency for component ratios of organic acid is 64.3-98.6%, 59.6-98.2 %, respectively, varied with HRT of 3-20 days. 2. For l0days of HRT, in order to investigate the effects of component ratio of organic acid, when its component ratio(H_(ac) : H_(pt) : H_(bu)) is 100 : 0 : 0, 50 : 25 : 25, 28 : 38 : 34 and 0 : 50 : 50(as COD), respectively, effluent concentration is 464mg/l, 666mg/l, 832mg/l and 1,148mg/l, respectively. 3. Component ratio of menthane gas for organic acids represents 55-70%, with variation o: HRT, 3-20days. 4. When the component ratios of organic acid(H_(ac) : H_(pt) : H_(bu)) is 50 : 25 : 25 and 23 : 38 : 34(as COD), methane production per COD removal for HRT of 3-20days is 0.27~0. 32, 0.21~0.30. 5. From the mass balance relationship, when the component ratios of organic acid is 50 : 25 : 25 and 28 : 38 : 34(as COD), methane production ratio, varied with HRT of 3days, 5days, l0days, 15days and 20days in 49.6%, 66.4%, 77.5%. 85.1% and 89.7%, respectively and 39.1%, 56.3%, 68.3%, 76.3%, 83.9%, respectively.

國民運動 傷害調査(Ⅳ) : 江原道를 중심으로

盧成圭,韓相俊 江原大學校附設體育科學硏究所 1987 江原大學校附設體育科學硏究所論文集 Vol.- No.12

To suggest preventive counter-measure for safety and the basic data necessary to safety education against sports injuries in adults, 3686 men and 2698 women who live in 4 districts(city, farm mining and fishing Villages) were answered the questionaire which dealt with sports injuries from Sept. 5, 1987 to Oct. 30, 1087. Favorite events of sports in the group of under middle age are Soccar and Tennis(men), Badminton(women), and those in the group of over middle age are Soccar and mountaineering(men), Health exercise and Badminton(women). The quantity of exercise showed better in Sedentary worker than in physical worker. The events which cause sport injuries are from Soccar and Tennis(men), mountaineering and Running(women). The most frequent sports injuries were Ankle damage in Soccar and Hiking-mountaineering(men), Running and Badminton(women). Disorders of injuries according to the injured body were as follows : Sprain ‥‥‥Waist, Wrist, Finger joint and Ankle. Fracture and Bruise‥‥‥knee joint, Finger Foot‥‥‥Abrasion, Bruise and Muscle dammage.

中·長距離 選手의 身體造成 및 最適體重에 關한 硏究

盧成圭,吳壽一,金斗卿 江原大學校附設 體育科學硏究所 1986 江原大學校附設體育科學硏究所論文集 Vol.- No.11

To find the best prediction on the body composition and optimum body weight those are need to perform the excellent performance in middle-long distance running, 15 numbers of junior high school boys and college man players who national superior middle-long distance runners were repeatedly measured 4 times by anthropometric measuring system. Conclusions from these measured data which are analyzed by statistical methods are follows. 1) Physical characteristics Physical characteristics of Middle-long Distance runners which were measured are presented as ; Body weight ratio on standing Height is 32.64±3.22%, Chest circumference ratio on Standing Height is 50.44±2.51%, Fat weight is 4.28±1.38㎏, % Fat weight is 8.69±1.84%, 2) Optimum Body weight for the best performance Equation of multiple regression for calcalation of optimum body weight in view of anthropometric method shows : Standing Height×(0.85)+Chest Depth×(0.32)+Bi-iliac Diameter×(0.09)+Bitrochanteric Diameter×(1.41)+Wrist Diameter×(-0.30)+Ankle Diameter×(1.28)=Y(Optimum wt.) In addition to regressional equation on optimum body weight in runners is showed as Y=Height×0.57-42.69 3) Optimum Net body weight : If runners Fat Weight Volume is over the level of Body fat weight volume it's calculus equations which should be decreased body weight for the best performance, are follows % Fat weight of runner - 7 Y-(Y× ------------------------------------)...............middle-long 100 Distance runner % Fat weight of runner -5 Y-( Y× --------------------------------------).............Marathoner 100

地域差에 따른 體格 發達 要因의 縱斷的 硏究(Ⅰ) : 江原道內 四個 地域을 中心으로 Sampled in four districts of Kang Weon Province

盧成圭,洪寬伊,李京濟 江原大學校附設體力硏究所 1980 江原大學校附設體育科學硏究所論文集 Vol.- No.5

줄넘기 運動의 有ㆍ無酸素的 運動强度 역치수준 設定을 위한 硏究

盧成圭,윤재원,김두경,하명수,장세원,윤중현 江原大學校附設體育科學硏究所 1987 江原大學校附設體育科學硏究所論文集 Vol.- No.12

The purpose of this study was the level of Aerobic-Anaerobic exercise intensity according to Rope skipping frequency by the skipping type at different age group(Middle, Junior high school and collegean). Types of Rope skipping(Jump, Leap and Double jump) with 100 rounds per min(5min), 120 rounds per min (5min) and max round frequency were tested by 120 volunteer untrained men and women students (forty middle school, forty high school and forty collegean) form Oct. 10. 1987 to No V.5. 1987. The results are showed at the skip intensity of 120 rounds per min. was higher than that of 100 rounds per min. at all skipping types, and men students showed less HR than women students. From the testing result, Double Jump was Considered as Anaerobic Exercise, Tean Jump was determined the strongest Aerobic exercise, and Jump or Leap were moderate Aerobic exercise. Recommending round frequency per min from multiple regression were follows. ----------------------------------------------------------------------------- Type Age 15 18 21 duration Sex ----------------------------------------------------------------------------- Jump man 127☆ 147 167 5min woman 113 126 140 5min ----------------------------------------------------------------------------- D.Jump man 137 169 211 2min woman 126 155 183 2min _____________________________________________________________________________ ☆ Round numbers per min

入力電流의 高調波 低減을 위한 새로운 다이리스터 整流回路의 개발

柳喆魯,金聖中,李公熙,李星龍,高榮浩 全北大學校 1987 論文集 Vol.29 No.-

The harmonics involved in input AC line currents of thyristor rectifier apparatus have recently been a serious problem in the cause of burning power condenser, mis-action of UFR(protective relay), and trouble of the automatic voltage controller, etc, in the sending or distribution electric power system. As an effective counter-measure for this, the method of having switching taps on the conventional interphase reactor and its artificial utilization have been adapted, as we know. The conventional 3 tap method, however, is not achieved an effect of reducing harmonics under firing angle 15˚. In this paper, a new method of reducing harmonics involved in input AC line currents or output DC voltage of rectifier circuit is presented, which is due mainly to the equipment of the 2-3 switching taps on interphase reactor. Thereofre, main contents of this study are the following three items; 1) optimal number of taps 2) optimal turn ratio of interphase reactor 3) optimal control angle of interphase reactor.

새로운 다중 전류원 인버어터의 개발

유철로,김홍규,이공희,이성룡 全北大學校 1992 論文集 Vol.34 No.-

A new multiple current source inverter for reducing the harmonics in output current is presented in this study. Condenser capacity necessary for the inverter design is decided by the commutation analysis of current source inverter with induction motor as load. And the proposed system operates 24 phase inverter by adding only tap changing circuit which consists of several taps and static switching elements to the 12 phase inverter, which is the double connected 6 phase inverter with an interphase reactor. Also to optimize the effectiveness of the harmonic reduction, the optimum turn ratio and tap changing control angle of interphase reactor are decided by digital simulation and its validity is verified with experiment. And under the optimum condition, it is clarified that the harmonics components involved in the output currents of the proposed inverter are nearly equal to those of the conventional 24 pulse inverter.

Digital PLL을 利用한 誘導電動機 速度 制御 System의 인버어터 出力 波形 改善에 關한 硏究

柳喆魯,李公熙,李星龍 全北大學校 1985 論文集 Vol.27 No.-

The inverter design for improving current waveforms using only reactors and capacitors is described. Some effects of harmonics on induction motor is reduced when the improved inverter applied to digital PLL speed control system. This paper also presented a determinating method of dynamic response and stability of system using microprocessor-based digital filter. Excellent speed regulation was obtained by the improved control system.

Microprocessor를 利用한 誘導電動機의 高效率 運轉에 관한 硏究

柳喆魯,李公熙,李星龍 全北大學校 1986 論文集 Vol.28 No.-

High efficiency drive system of induction motor using microprocesosr is suggested. In order to study the starting transients and the steady-state speed control performance, a mathematical model for each subsystem in time domain analysis is presented. To verify the validity in this system, the test results were compared with those obtained by optimal slip drive system and found closer to the optimal efficiency. At lightly load condition, for example its efficiency is improved from 18[%] to 42[%] as constant slip frequency 4.5[Hz].