• Journal of Wetlands Research
• /
• v.4 no.1
• /
• pp.51-61
• /
• 2002

The wetland is a biologically integrated system consisting of water, soil, bacteria, plants, and animals. The wetland helps sustain the ecosystem, control the micro-climate and flood, maintain the ground water level, and provide fishing grounds. From the environmental standpoint, the wetland plays a vital role in reducing water pollution by filtering out sand and other polluted matters, producing oxygen, absorbing chemicals and nutrients. For these reasons, interest in restoring the wetlands has been steadily increasing. Artificial wetland, which is also referred to as created wetland or constructed wetland, is an alternative to natural wetland. Like natural wetland, artificial wetland is environmentally friendly and can effectively lower pollutant levels. The Korea government is actively reviewing the construction of artificial wetlands in mining and water supply areas to decrease nonpoint pollutant sources. This paper attempts to develop a pollutant removal model for the water quality improvement function of artificial wetlands. Artificial wetland can improve the quality of the water; however, depending on the type of water inflow, vegetation and hydrology, its effect can be different.

• Land and Housing Review
• /
• v.3 no.3
• /
• pp.203-212
• /
• 2012

In this study, the total information portal service for urban regeneration was constructed to supply comprehensive information for Korean urban regeneration. The portal service is largely divided into an information analysis service for urban regeneration and an information disclosure service. For total information portal service, the information analysis service constructed a system for making district level decline diagnosis and city and county level potential analysis. Moreover, it can construct and control analyzed information specified at the district level. The information disclosure service consists of functions capable of recycling information, interworking the analysis service and facilitating expert participation. It also supplies data of total information DB in reprocessable format. For revitalization of communities, the information analysis service is constructed to lead experts on urban regeneration to share their opinions.

• Proceedings of the KIEE Conference
• /
• 1994.07b
• /
• pp.1547-1549
• /
• 1994

In recent years, fiberoptic technology is becoming indispensable in establishing communication networks due to its low loss, high capacity and non-inductive properties. In the power industry as well, the technology is being required to cable and facility monitering, and control system. But, duct in the manhole and space in the culvert are required to fiberoptic cable that is separated from power cable. Therefore, some cable makers and R&D has been studying the composite fiber/power cables. This report introduces the outline of ABF system, construction and properties of optical composite power cable that used ABF technology.

• Proceedings of the KIEE Conference
• /
• 1997.07a
• /
• pp.211-214
• /
• 1997

This paper describes the position accuracy performance improvement of hybrid type LPM. The harmonics are included in the thrust force component of LPM, those are generated from the the nonlinearity of intrinsic magnetic saturation characteristic and mechanical construction, and so on. In this paper, the performance improvable methode is proposed for the better thrust force by the corrected exciting current injection, and precise position control is achieved.

• Journal of Drive and Control
• /
• v.8 no.1
• /
• pp.33-39
• /
• 2011

풍력산업은 발전사업과 풍력터빈 제조산업으로 나뉜다. 세계의 풍력터빈의 설치량은 1996년을 기준으로 해서 매년 평균 28.6%의 성장률을 보여왔다[1]. 2008년 이후 그 성장세가 다소 꺾이기는 했지만, 그린에너지에 대한 세계적인 관심과 욕구, 화석연료 의존에서의 탈피 등의 이유로 계속적인 성장이 예상되고 있다. 특히 재생에너지 분야에서는 가장 시장 경쟁력을 확보할 수 있기 때문에 예측의 실현 가능성이 높다 하겠다. 풍력터빈과 그 부품 산업 역시 유럽이 주도적으로 끌고 나가고 있으며, 아시아와 북미의 시장이 대두됨에 따라서 지역의 풍력산업이 활발하게 발전하고 있다. 국내는 발전사업보다는 제조산업에 1차적인 관심이 있으며, 이를 바탕으로 국산화 모델의 개발 및 상용화에 정부와 민간이 힘을 쏟고 있다. 제품의 개발과 상용화는 시장을 바탕으로 이루어지는데, 불행하게도 국내의 풍력발전 시장은 매우 좁아서 국내 풍력터빈 제조사의 성장에 어려운 점이 있다. 하지만, 국내의 중공업기반과 산업수준을 적극 활용하여 터빈 완제품 및 부품산업의 발전을 위하여 국가와 민간차원에서의 노력이 가중되고 있다.

• Journal of Drive and Control
• /
• v.15 no.3
• /
• pp.29-35
• /
• 2018

This paper presents the design of attachments for dual arms of disaster responding heavy machine. The heavy machine handles a variety of tasks such as cutting, shredding, picking and moving in unstructured environment. Despite the need for rapid response, the heavy machine has difficulty in repeatedly replacing the attachment depending on the task. Thus, we propose a method to solve this physical and functional contradiction relation by using TRIZ separation principles. Above all, the existing equipment and the required working scenarios were surveyed and summarized in order to separate the attachments functionally for right-handed, left-handed and two-handed operation. Then, we proposed the design directions and conceptual design as following: multi function type attachment A, for precise operation and various operations; grab type attachment B, for grasping irregular objects and auxiliary device for both arms to handle bulky objects.

• Korean Management Science Review
• /
• v.24 no.2
• /
• pp.73-80
• /
• 2007

Robust Design(RD) is a cost-effective methodology to determine the optimal settings of control factors that make a product performance insensitive to the influence of noise factors. To better facilitate the robust design optimization, a dual response surface approach, which models both the process mean and standard deviation as separate response surfaces, has been successfully accepted by researchers and practitioners. However, the construction of response surface approximations has been limited to problems with only a few variables, mainly due to an excessive number of experimental runs necessary to fit sufficiently accurate models. In this regard, an innovative response surface approach has been proposed to investigate robust design optimization problems with larger number of variables. Response surfaces for process mean and standard deviation are partitioned and estimated based on the multi-level approximation method, which may reduce the number of experimental runs necessary for fitting response surface models to a great extent. The applicability and usefulness of proposed approach have been demonstrated through an illustrative example.

• Proceedings of the Korean Society of Agricultural Engineers Conference
• /
• 1999.10c
• /
• pp.313-318
• /
• 1999

This study is basic research to improve quality of asphalt concrete mixture, to preserve environment, and to recycle waste vinly. The mixing method and proper content of waste vinyl were determined through preliminary mix design. This study performed mix designs using 2 type gradations of aggregate in addtion content of wate vinly. Marshall stability at optimum asphalt content of asphalt concrete mixture addtin wate vinly was satisfied with the specification of the Ministry of Construction and Transportation , and its values indicated that dense grade asphalt concrete mixture containing waste vinyl were higher than common dense grade mixture (control). From this study, it was confirmed that addtion of waste vinyl improved quality of asphalt concrete mixture.

• Annual Conference of KIPS
• /
• 2017.11a
• /
• pp.438-441
• /
• 2017

드론에 미세먼지 측정 센서를 장착하고 원거리에서 비행시킴으로써, 주기적으로 특정 구역(비행 가능 구역)의 먼지 농도를 측정할 수 있다. 먼지 센서와 GPS로 측정된 데이터는 지그비 통신을 통해 지상 측정센터의 MySQL 서버로 무선으로 전송되며, 서버에 축적된 데이터는 어플 또는 웹과 연동되어 확인이 가능하다. 통계치를 이용하여 미세먼지 수치가 높을 경우, 해당 지역에 문자 경보 서비스도 제공한다.

• Journal of Advanced Marine Engineering and Technology
• /
• v.23 no.5
• /
• pp.686-692
• /
• 1999

For the purpose of increasing compressed air pressure higher than 30bar lightening weight and decreasing installation area of air compressor used for shipboard and industrial power plant it is necessary to arrange its cylinders as a w-type or v-type construction multi-stage compression pro-cess more than two stages and to increase its operation speed higher than 1200rpm In this recip-rocating type air compressor operated in high speed having a crank mechanism and complicate cylinder arrangement there is a vibration problems which can be solved by balancing its recipro-cating parts with balance weight and approriate arranging of cylinder's arrangement angles.