• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1993년도 가을 학술발표회 논문집
• /
• pp.207-212
• /
• 1993

When constructing highly precise production plants, for example, super LSI plants or semiconductor plants, it is important to take the necessary control countermeasures into consideration to obtain the working microvibration environment, which is directly related to product precision. Working environment of a clean room means vibration-free and there are only ultra-miro vibration which human cannot sense. In order to provide an place having a vibration-free working environment with only ultra-micro vibration it is necessary to posses a great number of vibration isolation technlogies, wide-ranging and abundant survey and teat data, and a high level of knowledge enabling comprehensive judgments to be made. In this study, experimental modal analysis is used to analyze the dynamic characteristics of double floor for vibration-proofing near apparatus which generate vibration. It is concluded that the double floor system with rubber pad inserted between floor panel and pedestal is good for vibration proof.

• 한국대기환경학회지
• /
• 제22권2호
• /
• pp.191-199
• /
• 2006

Animal feedstuff handling is one of the major fugitive dust sources in the port of Incheon. For the effective control of fugitive dusts emitting from the port of Incheon, dust control facilities with bag filter systems should be designed properly considering the characteristic of the fugitive dusts including those from animal feedstuffs. The ultimate goal of this study is thus to develop the optimum fugitive dust control system which will be applicable for the renovation of the port. As the first step to achieve this longstanding goal, filtration characteristics of soybean shell, the largest dust sources in the port, were investigated with the specially designed filter testing apparatus for this study. The variables tested for the experiments included filter materials, dust concentrations, relative humidities, and filtration velocities. Also, the filtration characteristics of the other animal feedstuffs such as sunflower seed shell, tapioca, and palm shell were investigated to determine $K_2$ as a function of filtration velocity. The information on $K_2$ will be used to design the optimum bag filter systems for animal feedstuffs handling in the port.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2008년도 추계종합학술대회 B
• /
• pp.677-680
• /
• 2008

센서 및 무선 네트워크 기능이 추가된 장치들의 소형화는 일상생활에서 컴퓨터를 이용하는 스타일에 변화를 가져오고, 유비쿼터스 컴퓨팅 환경으로의 발전에 기여하고 있다. 본 논문에서는 병원 환경에서 간호사, 의사, 환자 가족이 환자의 상태 정보를 공유하고 관찰할 수 있는 무선 모바일과 웹 환경 기반의 카메라 제어 시스템을 설계한다. 그리고 병원의 다양한 장비들을 하나의 시스템으로 통합하고, 원격 관리를 수행함으로써 환자 관리 시스템에 응용할 수 있다. 일반적인 웹 카메라는 병실의 환자 관찰을 위해 카메라 방향을 원격에서 제어하기가 불가능하다. 따라서 웹 카메라에 360도 회전이 가능한 스텝 모터를 부착하고 제어 보드를 통하여 스텝 모터가 구동하도록 설계하였다. 또한 모바일 및 웹 기반의 두 가지 환경에 따른 어플리케이션을 개발하여 제어 및 수집한 영상 데이터를 관찰함으로써 관찰자의 상황에 따른 효율성을 제공할 수 있다.

• 한국물환경학회지
• /
• 제26권1호
• /
• pp.44-51
• /
• 2010

A lab-scale apparatus for turbid water transport control was tested and examined. The channel had a dimension of $100cm{\times}30cm{\times}15cm$ (length${\times}$hight${\times}$width). And the turbidity water was prepared using two types of particles, bentonite and loess. The channel equipped with filamentous mat was operated under various shock load conditions. In the control channel, instantly, turbid water mixed with the clean water inside the channel and turbidity prevails the entire channel. While in the mat-equipped channel, it increases only at the bottom. Overall, the filamentous mat gave capture efficiency of 70~90% compared with the control group. The capture efficiency of turbid particles decreased with increased input turbidity flux. The result of experimental run on how turbid particles are separated in the mat channel shows that settling, filtration and attachment are the main processes. Meanwhile, turbidity was diffused from the channel bottom due to turbidity gradient before and after mat zone. The particle size before mat zone was lightly coarser than that after mat zone.

• 한국대기환경학회지
• /
• 제17권1호
• /
• pp.75-84
• /
• 2001

Hot gas filtration method via using ceramic filters is an evolving technology applicable to numerous industrial and air pollution control processes. Alumino silicate, organic and inorganic binders were the major raw materials in manufacturing ceramic filters. In this work, disc type ceramic filters(50$\phi$$\times$10t) were manufactured by vacuum forming processes using ceramic raw materials. The porosity and bulk density of disc type ceramic filers ranged from 86 to 89% and from 0.27 to 0.36 g/㎤, respectively. In this work disc type ceramic medium were tested utilizing coupon experimental apparatus. Disc type filters showed high collection efficiencies over 99.96% with Darchs law coefficients of 4.1$\times$10(sup)10~9.63$\times$10(sup)10/$m^2$ depending on mean pore sizes. In addition, filtration and detachment of ceramic filters turned out to be performed effectively using 10 cm/sec face velocity, 5 minutes filtration cycle, 100msec pulse jet valve opening time and 3 bar pulsing pressure.

• 전기전자학회논문지
• /
• 제20권2호
• /
• pp.184-187
• /
• 2016

본 논문에서는 빌딩 자동제어용 센서 및 신호의 듀플리케이터(Duplicator)를 개발한다. 개발된 듀플리케이터는 빌딩 자동제어에 사용되는 여러 개의 센서를 원거리에 있는 빌딩자동화기기에 직접 연결하지 않고 데이터 수집장치와 데이터 송신장치간의 논리적 통신방식을 사용하여 센서 데이터를 그대로 복원한다. 이때 센서의 신호가 원거리로 전송될 때 발생될 수 있는 전기적인 오차를 줄일 수 있고 자동제어의 시공원가를 절감시킬 수 있다. 또한 논리적 통신방식으로 개방형 프로토콜을 사용하기 때문에 상용 HMI와 호환이 되어 확장성을 보장한다. 개발된 듀플리케이터의 성능을 평가하기 위하여 실제 환경에서 시운전을 수행하여 정상 동작함을 보였다. 또한 측정 오차율, 동작 온도, 동작 습도 등에 대하여 공인 시험기관의 장비를 사용하여 실험한 결과 우수한 성능을 나타내었다.

• 제어로봇시스템학회논문지
• /
• 제15권12호
• /
• pp.1192-1196
• /
• 2009

Recently, the environment contamination problem and energy saving are the social issues. So, the Green IT based Smart Grid was suggested. The smart grid will let rates fluctuate even more dynamically, depending on conditions using energy. Thus, green IT includes the dimensions of environmental sustainability and the economics of energy efficiency. The smart controller in which it is controlled by DR in order to manage the energy consumption by using AMI is needed in order to apply its technology to the real life. In this paper, DR_WTIM of the IEEE1451.5 base which has the DR function for connecting to AMI of the wireless base is developed. By using this apparatus for the power control system, the energy saving effect is shown. Moreover, by using the IEEE1451.5 technology, the problem of energy consumption is solved in order to apply to power controller designed for efficient use energy.

• 수산해양기술연구
• /
• 제56권1호
• /
• pp.45-54
• /
• 2020

In this study, an automatic system for improving the working environment and increasing production efficiency of a laver aquaculture industry in Korea was developed by combining a hydraulic control system and a load cell in a current landing work of the laver. The improved gathering laver system allowed the automatic gathering process of the laver in the sea with the hydraulic control system connected to a cutting machine of the laver on the operating ship, which has been used for gathering the laver semi-automatically in a form of the traditional farming method. The transporting process of the laver from an operating ship to the land was improved as follows. A frame installed on the operating ship and the bag nets were designed and made to hold about 1,000 kg of the laver inside. The bag nets contain the laver on the improved operating ship were tied in knots and hooked on a crane using a load cell. The weight is measured immediately by lifting the bag nets through the load cell system. Weight information is communicated to the fishermen and successful bidders through the application. The advantages of the improved system can help fishermen to fish by improving their working environment and increasing production efficiency. The field survey to improve the landing operation of the laver aquaculture was conducted in Gangjin, Goheung, Shinan, Wando, Jindo, and Haenam in South Jeonnam Province. A total of 10 sites including Gunsan in Jeonbuk Province, Daebu Island in Ansan City, Jebu Island in Hwaseong City in Gyeonggi Province, and Seocheon in Chungnam Province were searched to collect data. Prototypes of the system were tested at the auction house of laver located in Goheung, where laver collection using hydraulic control and landing using road cell could be improved.

• 공업화학
• /
• 제16권2호
• /
• pp.217-225
• /
• 2005

H사의 유로변경식 고도하수처리 공법의 제어 변수가 DO와 수온 등으로 한정되어 있어 효율성의 만족도를 충족시켜주지 못하는 현재의 상황을 개선하고자 세 가지 개선방향을 설정하여 Simulation을 통한 Operation Data의 분석 및 장치구성과 실험을 통한 최적제어 Logic을 연구하여 이를 다시 S하수처리장에 설치 적용한 결과이다. 본 실험을 통해서 수온과 유량에 근간한 Operation Mode 변경의 최적화와 이를 통한 동력비 절감을 이루었고 암모니아성 질소의 농도에 따른 Operation Mode의 변경에서 일반 Normal Mode와 병행하여 Save Mode를 새로 적용하여 동력비 절감을 이루었다. 또한 DO 값을 송풍량과 수중폭기기의 교반속도에 의해 비례제어하고 유출수의 암모니아 농도에 따라 DO 값을 제어하여 안정적인 질산화를 이루었다. 이러한 결과는 공정효율의 극대화와 운영 및 유지관리비의 절감을 이루었다.

• 로봇학회논문지
• /
• 제5권3호
• /
• pp.270-277
• /
• 2010

Various robot platforms have been designed and developed to perform given tasks in a hazardous environment for the purpose of surveillance, reconnaissance, search and rescue, and etc. We have considered a terrain adaptive hybrid robot platform which is equipped with rapid navigation on flat floors and good performance on overcoming stairs or obstacles. Since our special consideration is posed to its flexibility for real application, we devised a design of a transformable robot structure which consists of an ordinary wheeled structure to navigate fast on flat floor and a variable tracked structure to climb stairs effectively. Especially, track arms installed in front side, rear side, and mid side are used for navigation mode transition between flatland navigation and stairs climbing. The mode transition is determined and implemented by adaptive driving mode control of mobile robot. The wheel and track hybrid mobile platform apparatus applied off-road driving mechanism for various professional service robots is verified through experiments for navigation performance in real and test-bed environment.