흙 지붕 경사면의 혼합종자 파종에 의한 식생분포 연구

정동양 ( Dong Yang Chung ) 한국환경복원녹화기술학회 2009 한국환경복원기술학회지 Vol.12 No.5

The hipped roof on the research building, which was constructed 51.9m above sea level on a hillock by Korea National University of Education in June 1999, is composed of four inclined planes which are 12m in breadth, 8m in length and have a 30 degree gradient. For the roof vegetation, the yellow earth collected from around the building was laid on top. It was designed to supply the soil on the slope with water for a considerable period by making rainfall pool at the edges. In order to prevent the soil on the slope from being swept away, 31 sorts of grass seeds were imported from Germany and sown in the soil. At the present day, 10 years after the seeds began to sprout and inhabit the settled slope, 30 individual plant species were identified in the period between April 2008 and March 2009. Out of 31 species were seeded on the slanted, soiled roof, only 8 were still alive. It was confirmed that the Artemisia Princeps var, Chrysantheum, Prunella Vulgaris and Lespedeza Cuneata have been the major species inhabiting the east, west, south and north inclined planes respectively. The Phragmites Communis was inhabiting the edge of the roof where the water supply was adequate, while the Dianthus Barbatus was primarily inhabiting the south-east side of the roof. As a whole, 26 identifiable plants and 4 unidentified plants were observed on the inclined planes of the hipped roof. In consideration of the plant distribution on the slope, it was confirmed that the selection of seeds may have had an effect on the slope vegetation. As for the yellow earth laid on the roof, it was discovered that about 2∼3cm thickness around the ridge was swept away, but the rest of the slope was in relatively good condition. Accordingly, it has been proven that vegetations can be applied to hipped roofs by using ordinary plants without any special structural measures.

강의 형체변화와 구조물파괴 : 한-독의 강개발비교와 대책

정동양(Chung Dong-Yang) 대한토목학회 1993 대한토목학회 학술발표회 논문집 Vol.1993 No.2

물길-한반도 대운하

정동양(Chung Dong-Yang) 대한건축학회 2008 建築 Vol.52 No.9

공업계 고등학교 전자 회로 실습교과에서 '8051 마이크로프로세서' 단원의 교수-학습을 위한 CD-ROM 개발

김성래,최준섭,정동양,Kim Sung-Rae,Choi Jun-Seop,Chung Dong-Yang 한국공학교육학회 2003 공학교육연구 Vol.6 No.1

공업계 고등학교의 교과서인 전자 회로 실습에 기술되어 있는 8051 마이크로프로세서 단원을 중심으로 CD-ROM을 개발하기 위한 본 연구는 교과서 내용의 설명에 치우치기 쉽고 학급에서 수준 차가 있는 학생들을 대상으로 하는 교수-학습의 어려움을 극복하고, 학생들에게 교과서 내용을 중심으로 멀티미디어를 활용한 자기 주도적인 보충학습의 기회를 제공함으로써 기초학력이 부족한 공업계 고등학교 학생들의 학업 성취도를 높이는데 그 목적이 있다. 이 연구의 목적을 달성하기 위하여 $\ulcorner$문헌 연구$\lrcorner$ $\ulcorner$연구교과서 및 자료 수집$\lrcorner$ $\ulcorner$CD-ROM제작$\lrcorner$의 과정을 거쳐 순차적으로 연구가 수행되었다. 각 단계별 연구 내용은 다음과 같다. 첫째, 문헌연구를 통해서 멀티미디어의 개념 및 특징, 수업에 활용 사례 등에 대해 고찰하였다. 둘째, 교과서 및 자료 수집에서는 8051 마이크로프로세서 단원을 중심으로 교과서를 분석하고 주요 내용을 추출하였고, 그래픽, 사운드, 애니메이션 등은 직접 제작하였다. 셋째, 기본 학습주제를 8개의 영역으로 구성하였고, 체계적인 학습 흐름이 될 수 있도록 제작하였다. 이상의 연구에서 전자 회로 실습 교과서의 8051 마이크로프로세서 단원을 중심으로 CD-ROM을 개발하여 교수-학습 자료로서 하나의 유형을 제시하였으며 이러한 학습 보조 자료는 기초 학습 능력이 대체로 부족한 공업계 학생들의 학습 활동에 다양한 형태로 도움을 줄 수 있을 것으로 기대된다. The purpose of this study was to develop CD-ROM so that students can understand 8051 Microprocessor unit easily in electronics circuit practice subject of technical high school. The study gives students, who have difficulties in learning, a chance for self-directed and supplementary learning by suggesting interface process with 8051 Practice Kit. To achieve these purposes, literature survey, collecting textbooks and materials, development of CD-ROM were gradually carried out. Each steps were as follows: Firstly, in literature survey, concepts and characteristics of multimedia and application to class were reviewed. Secondly, text contents on 8051 Microprocessor unit were analyzed, main contents were extracted and graphic, sound, animation were made. It was consisted of eight basic learning subjects, and designed to flow systematically. In this study, we presented a kind of teaching-learning material by developing CD-ROM in 8051 microprocessor unit in electronics circuit practice subject as a central matter. This material will be able to help technical high school students in learning

BCE-2D 모형을 이용한 2차원 하도분석

정승권(Jung Seung Kwon),정동양(Chung Dong Yang) 대한토목학회 2002 대한토목학회 학술대회 Vol.2002 No.11

농어촌 생활하수처리를 위한 수초·골재 하수처리장의 특성

정동양 한국교원대학교 환경과학연구소 2004 환경연구논문집 Vol.- No.8

A sewage treatment plant built with water plants and gravels in an open field has been operated for 3 years with a daily average flow of 50 m. The quality of treated water was regularly analysed and the economic assesment of the process has been investigated. Seasonal performance of the plant has been investigated with emphasis on treatment efficiency, shock loading responses, effects of sewage evaporation rate, effects of high and low ambient temperature, long term shutdown and start-up. Analyses of sewage indicated that the quality and quantity of the sewage generated in farming and fishing villages depend mainly on the life pattern of the residents. A sewage treatment plant with mechanical equipments may have high operating costs and low treatment efficiency to treat this type of sewage. However, the sewage treatment plant suggested in this study employs natural purification processes and has showed stable long term treatment efficiency even with shock loading and ambient temperature variation. Treatment of phosphorus with mechanical processes may need high operating costs but the suggested processes using water plants and gravels removes phosphorus in natural ways resulting in high removal efficiency and low costs. The natural sewage treatment plant showed good efficiency for all year around to meet the discharge guide-lines of drinking water protection area with respect to BOD, COD, TN. TP and SS. The high treatment efficiency may be due to the action of microorganisms living attached on the surface of the gravels. However, the water plants showed limited treatment performance.

수초·골재 하수처리장의 투수속도

정동양 한국교원대학교 환경과학연구소 2004 환경연구논문집 Vol.- No.8

This paper describes the effects of sewage amount, temperature, and years in operation on the infiltration rate of a sewage disposal system. The self-purifying sewage disposal system, which is typically used in rural areas, consists of reeds and fine gravel. Water plants are planted on the gravel bed which provides the habitat for microbes. The basic process is that the gravel bed filters incoming sewage. Thus this system requires the smooth flow of sewage through the gravel. However, the efficiency of the disposal system will be lowered if the gravel bed is clogged with sewage sludge. A three year study shows that infiltration rate slows down significantly until the 7th day, depending on the sewage amount and the temperature. After the 7th day, the infiltration rate remains almost constant. In addition, the infiltration rate decreases as the temperature falls. It also decreases as the number of years in operation increase. But there is no significant change in the infiltration rate after the 7th day, independent of the temperature, the sewage amount, and years in operation. In order to take advantage of high infiltration rate, which improves the efficiency of the disposal system in its early stages, having two gravel beds and using them alternatively will be efficient. This operation method is called intermittent load and makes the disposal system last longer. The water plant roots above the gravel bed make the effective filtration possible because they delay accumulation of the sewage sludge and stabilize the filtration ability.

제강 슬래그를 여재로 사용한 자연정화 하수처리장의 인(P)제거 효과

정동양 한국교원대학교 환경과학연구소 2004 환경연구논문집 Vol.- No.8

A blast furnace slag(BFS) has been used as a filter medium for the treatment of domestic waste waters during the period of 9-month. More than 90% of phosphorus was removed while the hardness of the treated water increased .by 5 times and the pH was significantly raised from 6.8 to 10.8. The high hardness and pH of the treated water indicated dissolution of BSF by the sewage. The experimental results suggest that BFS could be utilized for the removal of phosphorus in the waste water treatment plant using aquatic plants and gravels.

자연친화형 농어촌 하수처리장 모델개발

정동양 한국교원대학교 환경과학연구소 2000 환경연구논문집 Vol.- No.5

In 1991, the ministry of Gov't. Administration and Home Affairs set up a minimum of one sewage disposal plant in each province. By 1995, 264 models of the capillary infiltration method were set up in 331(78%) villages and the contact oxidation method was set up in 52 places. Since the Gov't. sent a letter to each responsible officer across the country stating their disap-proval of the capillary infiltration method, the environmentally friendly sewage disposal system has not been diffused. The current model(mechanical sewage disposal) being used, in agricultural and fishing villages, costs too much for maintenance and operation(￦50,000 per capita per year).In particular, because of the difference in sewage characteristics of agricultural and fishing villages from urban sewage, the efficiency of the disposal system is very low. Also, because of the growing need for more disposal plants, the Gov't. is looking for cheaper alternatives. This study has analyzed 2 kinds of sewage disposal. The first is used widely in agricultural and fishing villages in Germany. The second is used widely in similar areas of Korea. It has intended to analyze the characteristics, merits and defects of the sewage disposal water plants and pebbles model which is used widely in Germany and developed compatibly for Korea.

한국인의 물사용에 관한 연구

정동양 韓國實科敎育硏究學會 1999 實科敎育硏究 Vol.5 No.2

Water is man's most important resources. In highly developed countries, to secure and manage the water source, it is the top priority among political issues. From 1971 to 1994, a research was done by the government. According to this research, after 1988, the amount being used and supplied was balanced in the industrial and agricultural areas. We do not have any research record after that. And now the government is trying to estimate the needed amount of water without understanding how much is being used currently, because the water supplied was not taken care of properly. the river are contaminated which causes the ecosystem to be disrupted. Not only that, about 25 percent of the supplied water is also leaking underground. In spite of all these facts, The Construction and Traffic Division is planing to build a huge dam to provide 480L of water per person. This amount is 3.5 ties higher than european consumption. The amount of water used has decreased about 20% over 15 years in U.S.A. and 17% over 7 years in germany. It is hard to understand the reason why the korean government continues trying to provide this high amount of water. This study contains the forms of individual water use which is very important to correct this inconsistent policy, the possible ways to save water, and the daily used amount of water per person in 15 different ares through a research. This research has been done by occupations, income, residences, and members of family. The cost of water compared to income has also been analyzed, and the acceptable cost is been suggested by comparing to the european leading countries.