• Asian Pacific Journal of Cancer Prevention
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• 제15권21호
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• pp.9137-9142
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• 2014

Background: To explore the expression of DcR3 protein and its clinicopathological significance in bladder urothelial carcinomas (BUC). Materials and Methods: Immunohistochemistry was performed to detect the expression of DcR3, caspase-3, Bcl-2, VEGF, Ki-67, PCNA and P53 in 166 BUC and 56 normal bladder tissues. Western blotting was used to detect the expression of DcR3 in the supernatants of cultured BUC cells. Results: Overexpression of DcR3 was found in BUC tissues and cell lines, with significant elevation as compared to normal bladder tissues (p<0.0001). Higher DcR3 expression was related to the status of invasion, lymph node metastasis and recurrence. Furthermore, DcR3 expression was negatively correlated with caspase-3 and positively associated with Bcl-2, VEGF, Ki-67 labeling index (LI), PCNA LI and P53 (all p<0.0001), respectively. Conclusions: DcR3 may play a crucial role as an oncogene in tumorigenesis, deterioration and progress of BUC via influencing related pathways of apoptosis, proliferation and angiogenesis. The detection of DcR3 protein in the formalinfixed and paraffin-embedded samples could assist to predict in prognosis of BUC patients.

• 한국컴퓨터정보학회논문지
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• 제21권3호
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• pp.9-15
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• 2016

In this paper, DC-PLC typed one-wire controller was designed and manufactured especially for In-vehicle safe devices. One-wire by DC-PLC scheme is to be used as a power supply and ground to process the sensor data and to operate the vehicle actuators. To avoid complicate wires, we use the conventional wires without installing extra communication lines. The data collected from the sensors are transmitted to the main controller, processed by programming, and run the actuators corresponding to the commands sending to vehicle control board. The proposed method shows that only One-wire without requiring several wires make In-vehicle control devices simple and reduce the damage due to the loss of the wiring.

• 한국전기전자재료학회논문지
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• 제21권2호
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• pp.137-143
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• 2008

High voltage MLCCs with C0G temperature coefficient characteristics could apply DC-DC invertor were investigated for its dielectric properties. Also we manufactured MLCC through various process and studied the characteristics of dielectric break down voltage [BDV] and dielectric property as the variation of thickness in the green sheet and how to pattern the internal electrode. As the thickness of green sheet is increase, the dielectric BDV per unit thickness is decreased. But as the pattern of internal electrodes were floated we could manufacture the high voltage MLCC maintained its dielectric BDV a unit.

• 산업기술연구
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• 제29권B호
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• pp.145-149
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• 2009

A RF-DC converter is one of the most important components for a wireless power transmission. It has been developed for many applications such as space solar power system, and Radio Frequency Identification(RFID). In this paper, we designed three types of RF-DC converter and compare the performance of each. All types RF-DC convertoer have a maximum conversion efficiency at input power level of 0 dBm~5 dBm and RF-DC converter of third type was the best performance that has a 21.9% of conversion efficiency.

• 조명전기설비학회논문지
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• 제19권6호
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• pp.16-21
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• 2005

본 논문에서는 고주파 트랜스의 여자 전류를 이용하지 않고, 인덕턴스를 이용한 새로운 부분공진 영전압 스위칭 PWM제어 고주파 절연형 풀-브리지 DC/DC 컨버터의 회로를 제안하여 그 동작 원리를 기존 방식과 특성을 비교하였다. 또한 고주파 절연 트랜스 2차측에 동기 정류용 전력용 MOSFET에 새로운 기능을 부가한 온-오프 제어방식을 이용하여 넓은 부하 범위에 걸쳐 안정된 영전압 스위칭(ZVS)동작을 실현하였다. 또한 제안한 DC-DC 컨버터의 실험장치에 의해서 실측 효율을 97[%]이상 달성하였고 직류 무정전전원의 PWM 정류기의 출력단에 이용되는 새로운 방식이 스위칭 전원으로서 유효성을 증명하였다.

• 전기학회논문지
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• 제63권5호
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• pp.713-718
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• 2014

DC urban railway power system consists of DC power network and AC power network. The DC power network supplies electric power to railway vehicles and the AC power network supplies electric power to station electric equipment. Recently, because of power consumption reduction and peak load shaving, intelligent measurement of regenerative energy and renewable energy adapted on DC urban railway is required. For this reason, DC smart metering system for DC power network shall be developed. Therefore, in this paper, DC voltage sensor, current sensor, and DC smart meter were developed and evaluated by performance test. DC voltage sensor was developed for measuring standard voltage range of DC urban railway, and DC current sensor was developed as hall effect split core type in order to install in existing system. DC smart meter possesses function of general intelligent electric power meter, such as measuring electricity and wireless communication etc. And, DC voltage sensor showed average 0.17% of measuring error for 2,000V/50mA, and current sensor showed average 0.21% of measuring error for ${\pm}2,000V/{\pm}4V$ in performance test. Also DC smart meter showed maximum 0.92% of measuring error for output of voltage sensor and current sensor. In similar environment for real DC power network, measuring error rate was under 0.5%. In conclusion, accuracy of DC smart metering system was confirmed by performance test, and more detailed performance will be verified by further real operation DC urban railway line test.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 추계학술대회
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• pp.195-200
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• 2003

An electric vehicle uses the system to a power source whether it limps a high efficiency, without environmental pollution It coincides the best at the 21th century environmental regulation and energy frugality. The motor control system using DC-DC converter is carried out in this study. The Present control system is structured the better condition than that of the AC-DC converter with DC-AC inverter. Further, a vehicle dynamics analysis is peformed for the case of Mini-Baja it is found that the analysis dynamic system for the Mini-Baja gives a good design parameters.

• Journal of Power Electronics
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• 제11권6호
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• pp.811-818
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• 2011

Modulation strategies for multilevel inverters have typically focused on synthesizing a desired set of sinusoidal voltage waveforms using a fixed number of dc voltage sources. This makes the average power drawn from different dc voltage sources unequal and time varying. Therefore, the dc voltage sources are unregulated and require that corrective control action be incorporated. In this paper, first two new selections are proposed for determining the dc voltage sources values for asymmetric cascaded multilevel inverters. Then two modulation strategies are proposed for the dc power balancing of these types of multilevel inverters. Using the charge balance control methods, the power drawn from all of the dc sources are balanced except for the dc source used in the first H-bridge. The proposed control methods are validated by simulation and experimental results on a single-phase 21-level inverter.

• 전기학회논문지
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• 제61권1호
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• pp.16-21
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• 2012

The growth in IT industry has brought a corresponding rise in the number of connected digital devices in the distribution network. These digital loads lead to AC to DC conversion losses in order to supply power to them. The more the renewable energies and plug-in electrical vehicles penetrated our lives, the more the electrical losses are caused by AC to DC conversion process. Hence, this paper suggests the methodology for evaluating the amount of power supplied according to the ratio of DC power supply and performs an economic analysis of DC distribution system considering grid parity. In here, the cost of carbon emission reduced by renewable energy is also concerned.

• 전력전자학회논문지
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• 제21권4호
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• pp.320-327
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• 2016

We propose a multi-channel current-balancing single switch light-emitting diode (LED) driver for a 3D TV. Conventional LED drivers require non-isolated DC/DC converters as many as the number of LED channels, whereas the proposed LED driver needs only one power switch and several balancing capacitors instead of expensive non-isolated DC/DC converters. Therefore, the proposed driver features a simple structure with low cost and high efficiency. In particular, because its power switch can be turned off under the zero-current switching condition, the proposed driver has desirable advantages, such as improved electromagnetic interference characteristics and high efficiency. Moreover, it only uses a small number of DC blocking capacitors with no additional active devices for the current balancing of multi-channel LEDs. Therefore, the proposed driver exhibits high reliability and cost effectiveness. To confirm the validity of the proposed driver, we perform a theoretical analysis and present design considerations and experimental results obtained from a prototype that is applicable to a 46" LED TV.