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We describe a patient with reexpanded pulmonary edema after atrial septal defect closure through a right-sided minithoracotomy. After reexpansion of the right lung after weaning from cardiopulmonary bypass, a large amount of serous slight-hemorrhagic bronchial secretions spilled out from the right bronchus. Positive pressure ventilation and differential ventilation were used. We found no bleeding...
In this study, we examined demand response using air conditioners, determined the number of people by measuring CO2, and examined an application method to demand response. Most of the power in buildings is consumed by air conditioners, and their impact on the overall power consumption is high. Therefore, controlling the power consumption of air conditioners is an important factor in conducting demand...
In recent years, the introduction of solar power generation equipment has increased as distributed power supply has increased. A power conditioning subsystem (PCS) of a solar power generation system is an apparatus using an integrated circuit. Switching noise is generated because the inverter, which is the main constituent element of the PCS, performs DC-AC conversion through high-frequency switching...
In direct current (DC) system, there is no zero-cross of voltage curve, so that dangerous arc discharge shall be occurred inevitably between poles. Also, inrush current must be occurred in capacitors inside of ICT equipment. These unpreferable phenomenons will be happened at every movement of connect and disconnect. So, stable protection shall be necessary for human safety. New appliance coupler with...
In recent years, energy-saving measures in the household electrical appliances is progressing. Further, with the development of power electronics field, digital household electrical appliances that operate at DC power source is beginning to increase. In this paper, basic system action testing of a system was put into effect. An air-conditioning equipment was used for system action testing. As a result,...
Recently, energy policies have been adopted by various countries around the world to realize a low oxygen society. Attention has been paid to self-sufficient smart home technologies to reduce energy consumption. Power storage devices integrated into photovoltaic power generation devices have been introduced in smart homes. Such power storage devices are mainly used to decrease power peaks and shift...
Since the year 2000, the up to 400 Volt Direct Current (400VDC) powering interface for Telecom and Datacenters equipment has been standardized and industrialized as it brings advantages. Compared to 48 Volt Direct Current power solutions, it uses much less copper and the energy losses in cable are lower. Compared to Alternating Current uninterrupted power supply (UPS) benefits are simplicity higher...
Power consumption of ICT facilities and data centers has grown, and this has led to a need to improve energy efficiency of these facilities. DC power distribution systems employing 380VDC as the supply voltage is one promising approach to address this problem for countries around the world developing and deploying commercial services. We demonstrated a 380VDC power distribution system interconnected...
This paper 1 proposes an air conditioning equipment using dc power supply system. In recent years, energy-saving measures in the household electrical appliances is progressing in Japan. Further, with the development of power electronics field, digital household electrical appliances that operate at DC power source is beginning to increase. In this paper, basic system action testing of a system put...
Flexible, solderable electrodes were prepared on paper and glass fiber cloth using screen-printing and solder-plating techniques. Such electrodes can be manufactured with low environmental impact and at a low cost. The prepared electrodes were subjected to heat resistance, heat cycles, and damp heat tests. Flexible LED sheets were successfully prepared using these electrodes.
This paper describes a forecasting method for photovoltaic (PV) power by using the sky image data. The presented method is able to forecast the PV power one or two hours earlier at the PV generation site. The authors have forecasted and estimated the short period variation of solar radiation by analyzing sky image data as observed by a camera. To establish the forecasting methodology for a short-period...
The purpose of this paper is to analyze the dynamic characteristics of proposed digital peak current mode dc-dc converter. The waveforms of the output voltage and the reactor current are derived by the small signal analysis. They are compared with simulation results assuming an actual large amplitude operation. It is confirmed that the tendency of the transient response is indicated based on the analysis...
Power consumption of the ICT sector of information and communication facilities and data centers has grown, and this has led to a need to improve energy efficiency of these facilities. DC distribution systems employing 380 VDC as the supply voltage is one promising approach to address this problem, countries around the world and are progressing to develop and deploy commercial services. We demonstrated...
The amount of energy consumed by data centers and telecom buildings is increasing annually due to the buildup and high-density arrangement of ICT equipment, which is needed to handle the rapid rise in traffic brought on by the spread of smartphones and advances in the Internet usage environment. The NTT Group, whose business activities are centered about ICT services, uses approximately 8.5 billion...
The aim of this paper is to present a superior transient response of a digital peak current mode dc-dc converter in order to address input voltage fluctuation. In the dc power feeding system, a quick response is important for not only load fluctuation but also input voltage fluctuation. Since the proposed peak current mode control method can detect the peak current in real time, the transient response...
The basic characteristics of a 400 VDC appliance coupler for use in the power input module of ICT equipment in data centers and similar facilities are reported. When ICT equipment is powered at 400 VDC, the electrical characteristics differ from when conventional AC power is used and greater safety considerations are required. To maintain safety, the appliance coupler used in this evaluation is equipped...
The dc power feeding system has been attracted attention in recent years. Since the load is dynamically changed in this system, the stability of dc-dc converter is important. This paper presents the stability analysis and the transient response of digital integral gain changeable control dc-dc converter using small output capacitance. The proposed method changes the integral gain with a single logarithm...
This paper proposes a novel digital soft-start control method of dc-dc converter for a higher voltage direct current (HVDC) oriented data center application. The soft-start operation is used to suppress the inrush current and the overshoot of output voltage in the startup of a power supply. The proposed digital control method switches two functions which are used to control the speed of the soft-start...
The facility cost of the storage systems are a critical issue in the construction of micro grid, which is the core of the renewable energy. We propose the direct current mutual power interchange system as a way to reduce the storage battery capacity. This paper reports the outline of the proposed system and the verified result on the effect caused by electricity interchange upon the reduction of battery...
In Japan, the liberalization of the electricity retail market is starting in April 2016. Consumers will be able to choose the retail electric suppliers from which to buy. In Germany which domestic electricity market was fully liberalized in 1998, Stadt Werke (local power companies) has maintained more than 20% of the retail electric market share. We studied the feasibility of a regional energy business...
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