Xu, J.

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 performance measurement and monitoring during heat pump operation is difficult because expensive performance measurement devices or additional installation of various monitoring sensors required for performance calculation are required. When using a data-based machine-learning model, it is possible to predict and monitor

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 the radio portion mostly, and addresses the challenges of realizing a complete GSM/EDGE SoC with the RF integrated along with the rest of digital baseband circuitry. Several circuit level as well as architectural techniques are presented to realize a very low-cost and low-power 2.5G radio while meeting the stringent cellular requirem

This randomised controlled trial compared the effect of equipotent anaesthetic doses of sevoflurane (S group) versus propofol (P group), during remifentanil-based anaesthesia for off-pump coronary artery bypass surgery, on myocardial injury. Either sevoflurane or propofol was titrated to maintain bispectral index values between 40 and 50. In both groups, a targeted concentration of remifentanil 20 ng x ml(-1) was maintained during anaesthesia. The concentrations of creatine kinase MB and troponi

When the geothermal heat pump system is operated due to an imbalance in the heating and cooling load, the system performance is lowered due to the occurrence of a thermal environment problem in the ground. To solve the performance degradation, a hybrid geothermal heat pump system with an added auxiliary heat source is used. For the efficient operation of the system, it is necessary to check the performance coefficient of the hybrid geothermal system. The coefficient of performance can be monitor

This study assessed a variable flow rate control method for a circulation pump based on the geothermal water temperature difference in a geothermal heat pump system. As interest in energy conservation and efficient use is increasing around the world, the development and use of renewable energy is increasing and various related studies are currently underway. Among the renewable energy systems, the interest in geothermal energy system is high because of its efficient year-round operation. Geother

As the global energy trend continues, the importance of energy savings and efficient use is being emphasized, and the installation and operation of geothermal heat pump systems is increasing. In many buildings, where an actual geothermal heat pump system has been installed, problems of efficiency deterioration occur frequently because of the inefficient operation after installation of the heat pump system. The purpose of this study was to develop and verify the operating method for energy saving

The installation and operation of geothermal systems increased due to the expectation of good cooling and heating performance due to stable heat source temperatures. In actual geothermal system operations, heat source temperature rises or falls due to an imbalance of heating and cooling energy usage. Problems of source side temperature result in reduced geothermal system performance. The purpose of this study is to develop hybrid geothermal system operation technology to stabilize temperature an

The purpose of this study is to compare the heating and cooling energy demand and consumption according to mean thermal transmittance of external wall. In the world, energy saving and sustainable development is one of the important issues. In our country, energy policies like energy conservation plan report and EPI for building are established. This study compares energy demand and consumption according to mean thermal transmittance for EPI score by using ECO2 program. In this study, thermal tra

We classify the visibility of TS (Transport Stream) packet losses for SDTV and HDTV MPEG-2 compressed video streams. TS packet losses can cause various temporal and spatial losses. The visual effect of a TS packet loss depends on many factors, in particular whether the loss causes a whole frame loss or partial frame loss. We develop models for predicting loss visibility for both SDTV and HDTV resolutions for frame loss and partial frame loss cases. We compare the dominant predictive factors and

Ground heat accumulation caused by imbalanced heating and cooling loads in a building can cause the heat-source temperature to increase as the operating age of a geothermal heat pump (GHP) system increases. An alternative system to improve upon this situation is the hybrid GHP system. This study reviews existing research on GHP systems and hybrid GHP systems, variable water flow (VWF) control, and coefficient of performance (COP) prediction. Generally, constant flow control is applied to the cir

The purpose of this paper is to develop a predictive model of the COP of geothermal heat pump system using artificial neural network. In order to develop the prediction model, the target building is modeled though the TRNSYS energy simulation program. The initial input variables are derived based on the COP calculation formula and then the optimal input variables are derived by analyzing the correlation between input and output variables by unstandardized coefficient and variance analysis. COP p

인간 중심적인 사고의 포스트모더니즘의 다양성에 대한 추구와 문화적 사회적 영향으로 개인의 인격과 품성은 존중해야 하는 대상이었다. 이것은 또한 디자인 뿐 아니라 건축과 인테리어 디자인에도 영향을 미친다. 그것은 사람들의 삶과의 관계를 함께 반영하는데 이는 인테리어가 상호 작용의 관계이기 때문이다. 따라서 현대 사회에서 사람들의 다양한 요구를 충족시키기 위해서 제3의 공간을 만들었다. 오늘의 상업 공간은 사용자의 다양한 요구에 대해서 안락한 공간을 제공하려고 노력하고 있다. 상점에 가는 것이 가끔 생활 방식과 인생의 다음 단계로의 방향을 제공하기도 한다. 그것이 창의적인 힘을 위한 공간을 만들고 자 더 나은 세상을 향해서 노력하고 있다. 콜래보레이션이란 둘 이상의 개체 상호 간에 협업하는 현상을 언급한다. 콜래보레이션은 공간, 예술, 저급개념/ 고급개념, 고차적인 개념과 스타적인 협업으로 분류될 수 있다. 이 연구는 주로 협업에 대해서 연구되어 왔다. 공간 콜레보레이션은 경험적인 것과

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 power control (PC) and transmission probability (TP), respectively. Numerical result gives outage probability between the two schemes.

This paper proposes an application of splitting source-node power for a two-phase cooperative relaying system where the transmit powers of the source and the relay node are individually constrained. In the proposed usage, the limited source power is divided into two parts that are used in the first and the second phase. Unlike conventional relaying methods, in the second phase the source retransmits its signal with the split power and, at the same time, the relay forwards the signal received at