A5101877633- Geothermal Energy Systems and Applications
- Heat Transfer and Boiling Studies
- Building Energy and Comfort Optimization
- Heat Transfer and Optimization
- Energy and Environmental Systems
- Cooperative Communication and Network Coding
- Advanced MIMO Systems Optimization
- Refrigeration and Air Conditioning Technologies
- Full-Duplex Wireless Communications
- Image and Video Quality Assessment
- Video Coding and Compression Technologies
- Advanced Wireless Communication Technologies
- Advancements in PLL and VCO Technologies
- Flow Measurement and Analysis
- Diverse Academic Research Analysis
- Radio Frequency Integrated Circuit Design
- Risk and Safety Analysis
- Agriculture, Plant Science, Crop Management
- Advanced Image Processing Techniques
- Multimedia Communication and Technology
- Berry genetics and cultivation research
- Anesthesia and Neurotoxicity Research
- Cardiac Ischemia and Reperfusion
- Advanced Power Amplifier Design
- Energy Harvesting in Wireless Networks
Korea Institute of Civil Engineering and Building Technology
2024
Ministry of Food and Drug Safety
2022
National Institute of Food and Drug Safety Evaluation
2022
Yeungnam University
2017-2021
Hanyang University
2011-2016
Yonsei University
2016
Konkuk University
2011
Broadcom (United States)
2011
University of California, San Diego
2010
In a heat pump system, performance is an important indicator that should be monitored for system optimization, fault diagnosis, and operational efficiency improvement. Real-time measurement monitoring during operation difficult because expensive devices or additional installation of various sensors required calculation are required. When using data-based machine-learning model, it possible to predict monitor by finding the relationship between input output values through existing sensor....
A quad-band 2.5G SoC integrating all the RF, DSP, ARM, audio and other baseband processing functions into a single 65 nm CMOS die is described. The paper focuses on radio portion mostly, addresses challenges of realizing complete GSM/EDGE with RF integrated along rest digital circuitry. Several circuit level as well architectural techniques are presented to realize very low-cost low-power while meeting stringent cellular requirements wide margin. draws battery current 49 mA in receiver-mode,...
When the geothermal heat pump system is operated due to an imbalance in heating and cooling load, performance lowered occurrence of a thermal environment problem ground. To solve degradation, hybrid with added auxiliary source used. For efficient operation system, it necessary check coefficient system. The can be monitored based on mathematical model using measuring instrument. However, case models, there are lot input data required, many measurement sensors required for this. If factor that...
This randomised controlled trial compared the effect of equipotent anaesthetic doses sevoflurane (S group) versus propofol (P group), during remifentanil-based anaesthesia for off-pump coronary artery bypass surgery, on myocardial injury. Either or was titrated to maintain bispectral index values between 40 and 50. In both groups, a targeted concentration remifentanil 20 ng.ml -1 maintained anaesthesia. The concentrations creatine kinase MB troponin I were measured before start admission...
As policies for energy efficiency of buildings are being actively implemented, building performance improvement is urgently required. However, in Korea, information on measures and technologies dispersed concrete methods not established, making it difficult to apply effective measures. Therefore, required evaluate through database construction integrating diverse information. In this study, the architectural sector that satisfy domestic legal standards built. Because economic evaluation...
We propose a packet dropping algorithm for various loss rates. A network-based visibility model is used to evaluate the visual importance of each H.264 inside network. During network congestion, based on estimated packet, we drop least visible frames and/or packets until required bit reduction rate achieved. Based computable perceptually-based metric, our performs better than an existing approach (dropping B or frames).
This study assessed a variable flow rate control method for circulation pump based on the geothermal water temperature difference in heat system. As interest energy conservation and efficient use is increasing around world, development of renewable various related studies are currently underway. Among systems, system high because its year-round operation. Geothermal installations have increased number, but systems operate inefficiently. Generally Korea, operates under partial load...
ECO2 (building energy efficiency rating program) and passive conservation measures (ECMs) were established as a basic study for targeted methodologies decision support systems development in Korea to meet national regulations. The primary consumption economic evaluation of nonresidential buildings was performed. Passive ECMs classified planning performance elements. elements are the window-to-wall ratio (WWR) horizontal shading angle. thermal transmittance ( U -value) walls, roof, floor...
As the global energy trend continues, importance of savings and efficient use is being emphasized, installation operation geothermal heat pump systems increasing. In many buildings, where an actual system has been installed, problems efficiency deterioration occur frequently because inefficient after system. The purpose this study was to develop verify operating method for saving performance improvement multiple systems. A coefficient (COP) prediction model using artificial neural network...
The purpose of this study is to compare the heating and cooling energy demand consumption according mean thermal transmittance external wall. In world, saving sustainable development one important issues. our country, policies like conservation plan report EPI for building are established. This compares score by using ECO2 program. study, changes in wall insulation windows confirms impact on consumption. As a result, also decreased with reduced.
Building energy conservation measure (ECM) of insulation materials suitable for the domestic situation in construction sector (passive) is established. The ECMs were classified into walls, roofs, and floors. Also, economic evaluation databases, which are composed material costs, labor expenses constructed alternatives, built. After setting target building deriving ECM list building, use performed each alternative. Based on this, optimal was derived by applying decision‐support process.
We classify the visibility of TS (Transport Stream) packet losses for SDTV and HDTV MPEG-2 compressed video streams. can cause various temporal spatial losses. The visual effect a loss depends on many factors, in particular whether causes whole frame or partial loss. develop models predicting both resolutions cases. compare dominant predictive factors results two resolutions. achieve more than 85% classification accuracy.
The installation and operation of geothermal systems increased due to the expectation good cooling heating performance stable heat source temperatures. In actual system operations, temperature rises or falls an imbalance energy usage. Problems side result in reduced performance. purpose this study is develop hybrid technology stabilize improve by utilizing auxiliary system. operated comparing when operating pump alone a determined circulating water Hybrid predicted through numerical analysis...
The purpose of this paper is to develop a predictive model the COP geothermal heat pump system using artificial neural network. In order prediction model, target building modeled though TRNSYS energy simulation program. initial input variables are derived based on calculation formula and then optimal by analyzing correlation between output unstandardized coefficient variance analysis. developed applying hidden node number according previous research results. applied system, expected effect...
This paper proposes a novel usage of zero-forcing beamforming (ZFB) for secure transmission in multiple-input single-output (MISO) wiretap channels. When using ZFB transmission, the difficulty lies legitimate transmitter (Alice) hardly knowing channel to eavesdroppers (Eves). The knowledge Eves is essential when Alice builds precoder that could eliminate information leakage Eves. To overcome this difficulty, introduces torch node assumed be close an Eve and helps estimate though estimation...
Ground heat accumulation caused by imbalanced heating and cooling loads in a building can cause the heat-source temperature to increase as operating age of geothermal pump (GHP) system increases. An alternative improve upon this situation is hybrid GHP system. This study reviews existing research on systems systems, variable water flow (VWF) control, coefficient performance (COP) prediction. Generally, constant control applied circulating provide rate according maximum load. The need for VWF...
Approximately 30 percent of the energy in imported is consumed by building. Recently, to solve this problem, government has implemented policies curb global warming reducing consumption fossil fuels and greenhouse gases. The purpose study design improvement method Geothermal Heat Pump system for improving efficiency. building load calculated RTS-SAREK program measure heating cooling loads. use proposed Pump. This consider economical existing systems proposals systems. As a result, suggest...
This work investigates a simultaneous wireless information and power transfer (SWIPT) system for cognitive radio systems with average energy harvesting (EH) constraint. We propose two transmission schemes controlled by control (PC) probability (TP), respectively. Numerical result gives outage between the schemes.
This paper proposes an application of splitting source-node power for a two-phase cooperative relaying system where the transmit powers source and relay node are individually constrained. In proposed usage, limited is divided into two parts that used in first second phase. Unlike conventional methods, phase retransmits its signal with split and, at same time, forwards received phase, which causes interference between signals. order to avoid intervention, so-called co-phasing weight aligning...
In this paper, we propose a cooperative MIMO beamforming scheme for secondary spectrum access, where the wireless network consists of one primary pair PT-PR (primary transmitter-primary receiver) and ST-SR (secondary transmitter-secondary receiver). To access without performance degrading system, ST generates transmits superposed signal which is combined signals with different weighting vectors. PR SR extract desired linear combiner to eliminate undesired interference. We also joint...
Accurate measurement of air flow rate is essential in automatic building control using the variable volume (VAV) system. In order to solve problems existing method and improve accuracy control, this study developed a data-based multiple regression prediction model. The independent variables used development predictive model were selected as factors for monitoring when operating with conditioning Data collection correlation between terminal unit analyzed. Using IBM SPSS statistics version 25,...
Due to the global public health crisis caused by coronavirus disease 2019 (COVID-19) pandemic, importance of vaccine development has increased. In particular, a rapid supply vaccines and prompt deployment vaccination programs are essential prevent overcome spread COVID-19. As part regulations, national lot release is regulated responsible authorities, this process involves assessment before marketed. A can be released for use when both summary protocol (SP) review quality control testing...
In this work, we consider a cooperative cognitive radio network with Poisson distributed primary users. We first provide an optimal power allocation for the secondary user while guaranteeing quality of service users and analyze outage probability when is given. To minimize user, relay selection considered among candidate relays. Since scheme needs high processing complexity, propose simple suboptimal strategy low complexity. Numerical results show that proposed performs almost same as scheme.