The main purpose of this study was to investigate the characteristics of cylindrical electrostatic precipitator with centrifugal effect in viewpoints of pressure drop and collection efficiency, experimentally. The experiment was carried out for the analysis of current-voltage, pressure drop and collection efficiency with various experimental parameters such as the applied voltage, inlet velocity, inlet size and inlet type(upper and bottom), etc. In the results, the pressure drops were estimated as 27∼54, 34∼63㎜H2O for inlet size 15㎜×3O㎜ and 30㎜×60㎜, respectively. The collection efficiencies were shown over 99% with the small inlet size(15㎜×30㎜) for the applied voltage 40㎸, inlet velocity(15∼21m/s), and 51∼89% with the large inlet size(30㎜×60㎜). Moreover, in the applied voltage 0㎸ and inlet size 15㎜×30㎜, the collection efficiency induced by centrifugal force was represented as about 35% with inlet velocity 15∼21m/s.

재해영향평가제도가 시행된 이후 평가서에는 홍수량 산정 및 개발로 인해 증가된 유출량에 대한 대처방안으로 저류지용량을 산정할 때 임계지속기간의 개념을 도입하여 각종 수문량이 산정된다. 임계지속기간은 수공구조물의 종류, 유역특성과 계획강우의 시간적분포 및 재현기가, 유출모형에 따라 변화한다. 본 연구에서는 저류지 설계시 소요용량을 결정하기 위해 기존 연구에서 제안한 바 있는 저류비의 개념을 이용하여 산정된 저류지용량과 강우지속기간에 따른 저류지용적이 최대가

The objectives of this study were 1) to evaluate the environmental and social cultural public benefits but a food supply, 2) to revalue the importance of rural and rural living, This study was carried out through review of literature, a delphi technique, a case study. It was mainly used the delphi technique by expert group. Major findings were as follows ; 1. The public benefits in rural were classified into three categories:(1) social culture (2) natural environment (3) economic & etc. 2. To evaluate the values for public benefits, questionaries were developed by expert group, and the total number of items were 30. 3. There were picked out 12 items on social culture, 10 items on natural environment, and 8 items on economic & etc of public benefits in rural. 4. In the public benefits, a food supply was highest in total 30 items, and water resources contain, emotional-psychological rest, place of environment education, beautiful view, etc were followed in order.

If a system such a port and regional economy has a large boundary and complexity, the system's substance is considered as a black box, forecast accuracy will be very low. Futhermore various components in a port and regional economy exert significant influence on each other. To copy with these problem the from of structure models were introduced by using SD model. This study has the issue of simplifying the regional economic effects of the port as contributing to raising the regional income. The regional economic effects of port have various indirect ones except for this. So, SD(System Dynamics) was presented, and applied to simulate port and regional economy.

The antibacterial effect amino acid-copper(Ⅱ) surfactant on fish pathogens was studied. Fish pathogens of Edwardsiella tarda, Vibrio anguillarum, Aeromonas hydrophila and Streptococcus sp. were selected, cultured in nutrient agar and adjusted at 2 × 10 5∼106 CFU/㎖ in phosphate buffer saline before the addtion of amino acid-copper(Ⅱ) surfactant with different concentrations. All tested pathogens died within 1 hour with 1 ppm of amino acid-copper(Ⅱ) surfactant. In comparison with formalin and ET, amino acid-copper(Ⅱ) surfactnat was more effective in antibacterial capacity.

Keon Soo Lee and Seung-ju Yeo. 2000. Restructuring Infinitives in Korean. Studies in Modern Grammar 21, 21-48. This paper argues that Wurmbrand`s (1998) analysis of restructuring infinitives is on the right track. Her analysis denies the implicit assumption that all infinitives have the same syntactic structure, CP/TP. The auxiliary verb construction in Korean has an infinitival complement which behaves as if it lacks clausal nodes; they allow NP licensing and honorification both of which cannot hold if there is a clausal boundary in between. Furthermore, this transparency effect is correlated with the absence of tense morphemes and complementizer in the auxiliary verb construction. However, unlike Wurmbrand`s assumption that restructuring infinitives are bare-VP, we argue that the infinitive complement of the auxiliary verb construction in Korean is vP on the basis of case alternations and the imperfect control.

Kyunghee Yeo. 2000. A Case Study on the Subject-Exchange Teaching Systems in Elementary English Class: a Transitional Scheme of Problem-Solving. Studies in Modern Grammar 20, 199-213. It goes without saying that a teacher who is responsible for the effective teaching is one of the most important factors in teaching-learning situation. The controversy over who should teach English to elementary school students has continued since English was introduced in elementary schools in 1997. There are two systems in which English can be taught in elementary schools. One is the system in which a classroom teacher who has the deepest understanding toward his/her students teach English. The other is the system in which a subject teacher who has good command of English teach English. Generally, the Ministry of Education encourages the classroom teacher to teach English to children and the teachers who have little confidence in teaching English prefer the system in which a subject teacher teaches. Both systems are said to he strengths and weaknesses. This paper suggests the subject-exchange teaching system that compromises above mentioned two systems and shows how elementary school teachers think of this system and illustrates the case and the effects of subject-exchange teaching system.