• 한국농공학회:학술대회논문집
• /
• 한국농공학회 1998년도 학술발표회 발표논문집
• /
• pp.279-286
• /
• 1998

The south-western part of Korea is situated in an unbalance of water supply and demand relating to the Keum, Mankyung, Dongjin and Youngsan River and their estuary reservoirs. For example, the Keum River estuary reservoir is discharging the larger amount of yearly runoff into the sea due to the small storage capacity, while Saemankeum estuary reservoir which is under construction, has the smaller runoff amount comparing with its storage capacity, And the downstream area of the Youngsan River, such as Youngkwang, Youngam are deficient in water due in larger demand and smaller supply. In order to solve the above unbalanced water supply and demand and also to improve the water use efficiency, the Hierarchical Operation Model for Multi-reservoir System(HOMMS) has been developed and applied to analyze the multi-reservoir operation assuming that the above reservoirs were linked each other. The result of this study shows that 2,148MCM of annual additional water requirement for agricultural and rural water demands are required in this region at 2011 of target year, and these demands can be resolved by diverting and reusing 1,913MCM of the released water from the estuary reservoirs into the sea.

• 한국멀티미디어학회논문지
• /
• 제7권8호
• /
• pp.1058-1065
• /
• 2004

단순 모니터에서 CPU, 메모리, 그리고 하드디스크를 갖춘 셋탑박스에 이르기까지 내장형 시스템은 다양한 응용에 사용되고 있다. 특히 휴대용 또는 소형기기에 멀티미디어를 서비스하는 경우가 증가하고 있고 이들 시스템에는 내장형 운영체제가 탑재되고 있다. 본 논문에서는 멀티미디어 서비스를 위한 내장형 리눅스가 탑재된 임베디드 시스템에서 응용 프로그램과 운영체제 커널사이의 메모리 복사 요구를 감소시키는 Null copy기법을 제안한다. 저성능의 컴퓨팅 파워 및 저용량의 메모리를 가진 내장형 시스템에서 연속 미디어를 네트워크를 통해 실시간으로 전송하고자 할 때 Null copy 기법은 시스템의 QoS를 만족시킬 수 있다. 웹 카메라를 내장형 리눅스 개발 보드에 장착하여 영상 전송 환경을 구축한 결과 Null copy 기법은 CPU 이용률 및 마감시간 실패측면에서 기존 커널에 비해 우수한 성능을 나타내었다.

• Current Research on Agriculture and Life Sciences
• /
• 제28권
• /
• pp.63-68
• /
• 2010

The epigenetic therapy of cancers is emerging as an effective and valuable approach to both chemotherapy and the chemoprevention of cancer. The utilization of epigenetic targets that include histone methyltransferase (HMTase), Histone deacetylatase, and DNA methyltransferase, are emerging as key therapeutic targets. SET containing proteins such as the HMTase Setd1b has been found significantly amplified in cancerous cells. In order to shed some light on the histone methyl transferase family, we cloned the Setd1b gene from Mus musculus and build a collection of vectors for recombinant protein expression in E.coli that will pave the way for further structural biology studies. We prospect the role of the Setd1b pathway in cancer therapy and detail its unique value for designing novel anti-cancer epigenetic-drugs.

• 한국실내디자인학회논문집
• /
• 제27권1호
• /
• pp.3-11
• /
• 2018

The number of shared offices has increased and changed within the flow of the era into various forms in recent days. Co-working spaces and related shared space businesses are growing fast, keeping pace with the trend recently. It is confirmed that the need of spaces grew 180% since 2015 to 2017. Most of the shared offices in Seoul are placed in Gangnam circle, it is verified that shared office is providing work, space, and community by visiting cases of foreign companies, domestic companies, local companies. Meanwhile, shared space can be categorized into serviced office, co-working space, virtual office, and daily office. It is to consider various target levels by leasing service or the difference of costs. It is divided into forms of dispersion, circulation, and concentration and is planned to increase the utilization of communities' traffic according to the allocation of shared office. The business is conducted network-centered. During the process of communication, members can get chances to exchange and build communities. They are making business ecosystem which they can coexist and grow together. Shared offices have a view of a solution to empty rooms and will last for a while, and it is expected that co-working system be settled as office space and giving people sense of belonging on their workspace.

• 한국유기농업학회지
• /
• 제26권2호
• /
• pp.173-180
• /
• 2018

This study was conducted to investigate farmers' satisfaction in organic farming technologies developed by the Rural Development Administration (RDA). The survey targeted farmers who were eco-friendly or interested in eco-friendly agriculture. 70% of the target farmers were doing eco-friendly farming, and the satisfaction rate of the technology developed by the RDA was 3.85 points. The satisfaction of the farmers who participated in demonstration and demonstration of the farming field of the developed technology was 4.00 and the satisfaction level of organic farming instruction manual was 3.95. In addition, 38.4% of the surveyed areas were found to be pest control areas, and the impacts on the satisfaction of the organic cultivation related technology utilization and the satisfaction of the organic cultivation guide were analyzed. As a result, the RDA needs to develop and supply customized technology for aged small farmers.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2006년도 추계학술대회
• /
• pp.32-35
• /
• 2006

The validation of a groundwater source heat pump system installation site is estimated by bydrogeothermic model ing. The hydraulic characteristics of the aquifer system is evaluated from pumping and recovery tests. In addition, the temperature distribution by the pumping and the injection of groundwater, and water level fluctuations are simulated by numerical modeling. The total cooling and heating load for the building is designed as 120RT(refrigeration ton) and the ground water source heat pump system covers 50RT as a subsidiary system The scenario of heat pump operation is organized as pumping and inject ion of groundwater that is performed for 8 hours per day in cooling mode for 90 days during the summer season The heat transfer by the injected warm water is limited near the inject ion wells in the simulated temperature distribution. The reason is that the given operation time is too short to expect broad thermal diffusion in large volume of the aquifer in the simulation time The simulated groundwater level and temperature distribution can be used as important data to develope an energy effective pumping and injection well system. Also it will be very useful to evaluate the hydraulic capacity of a target groundwater reservoir.

• 웰빙융합연구
• /
• 제2권2호
• /
• pp.39-45
• /
• 2019

The purpose of this study is to solve the problem of revision or abbreviation of questionnaires based on the previous studies suggested by many existing empirical studies. In addition, this study aims to provide the theoretical basis of the research method which has been variously approached since it presents the methodology that can directly measure the research object. For this purpose, this study proposed a more elaborate analysis method using the differences in perception of individuals who are interested in cognitive research. Specifically, the perception gap(D) can be used as an independent variable, a dependent variable, and a moderating variable. And this study suggested an effective research approach using the measurement of perception difference. The difference of perception suggested that it can be used as a measure to overcome the limitations of existing researches used it as independent variables or mediating variables that measure only one factor of expectation and performance or importance and satisfaction. In addition, it is highly likely that various analyzes on the perception differences, which are the result of measuring target factors for the same person, will be quite effective in the situation where follow-up of respondents is difficult. This study is expected to overcome various limitations reported by empirical studies such as scale utilization problem and follow-up survey difficulty. In future research, it was expected that the limitation of the factor derivation process in the research approach could be complemented by web crawling and text mining of big data analysis.

• 한국경영과학회지
• /
• 제24권3호
• /
• pp.63-72
• /
• 1999

Recent studies on the Constant Bit Rate and Variable Bit Rate transmissions have mainly focused on the frame by frame encoder rate control based on the quantization parameter. With the existing approaches it is difficult to guarantee a consistent video quality. Also, the rate control overhead is too high for the real-time video sources. In this paper, a channel rate allocation scheme based on the control period is proposed to transmit a real-time video, in which the control period is defined by a pre-specified number of frames or group of pictures. At each control period, video traffic information is collected to determine the channel rate at the next control period. The channel rate is allocated to satisfy various channel rate constraints such that the buffer occupancy at the decoder is maintained at a target level. If the allocated channel rate approaches the level at which the negotiated traffic descriptions may be violated, the encoder rate is decreased through adjusting quantization parameters in the MPEG encoder. In the experimental results, the video quality and the overflow and underflow probabilities at the buffer are compared at different control periods. Experiments show that the video quality and the utilization of network bandwidth resources can be optimized through the suitable selection of the control period.

• 정보관리학회지
• /
• 제30권2호
• /
• pp.143-167
• /
• 2013

최근 문화유산기관에 대한 이용 요구가 복합화 되어 가는 가운데 미국에서 도서관, 기록관, 박물관의 기능을 통합한 라키비움의 개념이 제시되었고, 이후 국내 정보학계에서는 관련 연구가 유수 진행되었다. 그러나 라키비움은 아직까지 현실적으로 구현되지 않은 기관이므로 이에 관한 선행 연구들 또한 이론적인 전개에 중심을 두고 있다. 이에 본 연구는 국내의 도서관, 기록관, 박물관을 대상으로 라키비움 리모델링에 필요한 기관 현황 분석 활동 계획을 수립하였다. 방법적으로는 기존 라키비움 공간기획 연구의 절차를 정밀화하였고 분석 도구로는 관련 법률과 지침 등을 활용하여, 보다 현실적인 라키비움 공간기획의 실행 방안을 제안하였다.

• Journal of Electrical Engineering and Technology
• /
• 제9권6호
• /
• pp.1795-1804
• /
• 2014

Owing to the reduction in the peak power of a DC railway subsystem, many studies on energy storage system (ESS) applications have received attention. Each application focuses on improving the efficiency and addressing regulation issues by utilizing the huge regenerative energy generated by braking-phase vehicles. The ESS applications are widely divided into installation on a vehicle or in a substation, depending on the target system characteristics. As the main purpose of the ESS application is to reduce the peak power of starting-phase vehicles, an optimized ESS utilization can be achieved by the operating at the highest peak power section. However, the weight of an entire vehicle, including those of the passengers, continuously changes during operation; thus, considering the total power consumption and the discharging point is difficult. As a contribution to the various storage device algorithms, this study deals with ESS on board vehicles and introduces an ESS operating plan for peak-power reduction by investigating the weight of a train on a real-time basis. This process is performed using a train-performance simulator, and the simulation accuracy can be increased because the weight in each phase can be adopted in the simulation.