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실내사회체육시설의 온도, 습도, 조명도에 관한 실태분석
조연철,이원재,이달원,김영환 啓明大學校 生活科學硏究所 1995 科學論集 Vol.21 No.-
This study is aimed to analyze investigations on the envoronmental conditions of indoor sports facilities and to research the effects of environmental pollutants on the health. Among the sites of rollerskate, bowling, table tennis, and taekwondo in Taegu city area, three sites were selected in this study respectively. The data measured are temperature, humidity and illumination. These examined data were compared with seasons, indoor and outdoor, and time from standard levels. The conclusions derived from the results obtained are as follows : Air temperture was not significantly different in all times, but showed significant differences between indoor and outdoor values. In bowling site, it was not significantly different in seasons. In rollerskate site, it showed distinctive differences among 4 sites. Humidity did not show significant difference with time, but was the lowest between 2-4 p.m. and 6-8 p.m. in winter. So temperature variation had effects on the discomfort in indoor sports facilities more than temperature level itself. Illumination was below 100 Lux in rollerskate and taekwondo sites, over 100 Lux in table tennis and bowling sites. This investigation revealed some negative aspects of environmental management. So we must be able to maintain artificial illumination for guests' eye-power. From the above results, the government is requested to prepare an appropriate administrative measure for the commercial indoor sports facilities.
조달운,남영우 崇實大學校 生産技術硏究所 1993 論文集 Vol.23 No.-
A study on the removal of heavy metal ions using activated carbon is performed. Heavy metal ions tested were Hg, As, Cr, Cd and Pb ions. Variations of pH, shaking time, temperature and coexisting ions were major experimental parameters. The optimum pH range for removal of metal ions were 1-3 for Hg, 5-6 for Cr and As, above 8 for Cd and above 5 for Pb, respectively. Removal of Hg, Cr and As were proceeded by adsorptivity of active carbon, however, Cd and Pb were removed by precipitation reaction.
특정한 이득여유와 위상여유를 이용한 PID 동조 알고리즘
진달복,조준호,류영국 원광대학교 2001 論文集 Vol.26 No.-
이득여유와 위상여유를 보장하는 견실한 제어기의 설계는 arctan 함수의 근사화로 가능하게 되었다. 이 논문은 arctan 함수의 새로운 근사화로 특정한 이득 여유와 위상여유를 기초로한 PID 동조 알고리즘을 제안한다. arctan 함수의 새로운 근사화 방법은 arctan(0), arctan(0.5) 이용한 1차선형 보간식과 arctan(0.5), arctan(1)을 이용한 1차선형 보간식 2개를 선형 결합하여 근사화 하였다. 제안된 방법의 주파수 응답 특성에서 특정한 이득여유와 위상여유를 보장함을 알 수 있다. The robust design of controllers to ensure gain and phase margin is can be use approximation of arctan function. In this paper, We proposed a tuning algorithm PID controllers based on specified gain and phase margin by a new approximation of arctan function. This method have linear interpolation equations of two arctan interval instead of one arctan internal of arctan(x). It is shown that the frequency response of this method was to ensure specified gain and phase margin.
손진언,김달한,후루야에이지,조영삼,이성식,야마시타세이치 東亞大學校 大學院 1991 大學院論文集 Vol.16 No.-
Uptake curves were obtained for p-nitrophenol/XAD-2000 resin system using a shallow-bed method for various concentration ranges at 298.2K. Distilled water was employed as solvent. The values of effective intraparticle diffusivity were detrermined by comparing experimental and theoretical uptake curves. The values obtained for solvent i. e, distilled water system was not dependent on the amount adsorbed in the higher concentration range. Those results shows that, except in the region where there is a low adsorbed amount, and adsorber packed with macrorecticular resin particles can be designed using a traditional pore diffusion model.
조관형,김평청,우달식,조영태 한국환경과학회 2002 한국환경과학회지 Vol.11 No.4
본 연구의 시료는 현재 서울특별시와 수도권 도시들에서 상수원수로 이용하고 있는 한강수를 대상으로 수행되었다. 배·급수계통의 2차 소독을 위한 클로라민소독의 특성에 관하여 고찰하였으며 그 결과는 다음과 같다. 1) 25 ℃, Cl_2 / NH_3-N비 1:1 ~ 14:1에서 pH6, 7, 8의 불연속점은 각각 Cl_2 / NH_3-N비 11:1, 9:1, 10:1이었다. pH6의 경우, Cl_2 / NH_3-N비가 9:1일 때 총 잔류염소량이 최대인 반면, pH7, 8의 경우 Cl_2 / NH_3-N비가 각각 6:1, 5:1일 때 최대가 되었다. 2) pH가 6, 7, 8로 증가함에 따라 모노클로라민이 최대로 생성되는 Cl_2 / NH_3-N비는 7:1에서 5:1로 이동하였으며, pH6 ~ 8 범위에서 pH가 증가함에 따라 모노클로라민의 생성량이 많았다. 3) 클로라민의 분해는 Cl_2 / NH_3-N비가 증가하고 pH가 낮을수록 증가하였다. 클로라민의 잔류성은 유리염소보다 월등히 좋았다. pH6에서 모노클로라민과 디클로라민이 생성된 이후, 접촉시간이 경과함에 따라 디클로라민의 분포비가 증가하였다. This study was conducted to investigate the characteristics of chloramination as a secondary disinfection in a drinking water distribution system. At the range from pH 6 to pH 8, monochloramine was predominant with a trace of dichloramine, and the free chlorine was detected after breakpoint. At 25℃, the breakpoints of pH 6, 7 and 8 appeared when the weight ratios of chlorine to ammonia nitrogen were 11:1, 9:1 and 10:1 respectively, and the peak points on the breakpoint curves at pH 6, 7 and 8 were in the Cl_2 / NH_3-N ratio of 9:1, 6:1 and 5:1 respectively. As pH increased from 6 to 8, maximum point of monochloramine on the breakpoint curve was moved from 7:1 to 5:1 in the weight ratio of chlorine to ammonia nitrogen. The maximum concentration of monochloramine was formed at the pH values of 7~8 and in the Cl_2 / NH_3-N ratio below 5:1. As the Cl_2 / NH_3-N ratio increased and the pH lowered, chloramines decay proceeded at an increased rate, and residual chloramines lasted longer than the residual free chlorine. The monochloramine and the dichloramine were formed at pH 6, and then the dichloramine continued increasing with contact lime.