• Proceedings of the Korean Vacuum Society Conference
• /
• 2014.02a
• /
• pp.275.1-275.1
• /
• 2014

The effects of the interfacial buffer layer and temperature on the organic bulk heterojunction (BHJ) nanostructures of copper phthalocyanine (CuPc) and fullerene (C60) systems were investigated using real time in-situ x-ray scattering. In the CuPc:C60 BHJ structures, standing-on configured ${\gamma}$-CuPc phase was formed by co-deposition of CuPc and C60. Once formed ${\gamma}$-phase was thermally stable during the annealing upon $180^{\circ}C$. Meanwhile, the insertion of CuI buffer layer prior to deposition of the CuPc:C60 BHJ layer induced lying-down configured CuPc crystals in the BHJ layer. The lying CuPc peak intensity and the lattice parameter were increased by the thermal annealing. This increment of the intensity seemed to be related to the strain at the interface between CuPc:C60 and CuI, which was proportional to the enhancement of the power conversion efficiency of the device.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.16 no.2
• /
• pp.165-170
• /
• 2016

Nano-scale power splitter based on curved plasmonic waveguides are designed by utilizing the multimode interference (MMI) coupler. To analyze easily the adaptive properties of plasmonic curverd multimode interference coupler(PC-MMIC), the curved form transforms equivalently into a planar form by using conformal transformation method. Also, effective dielectric method and longitudinal modal transmission-line theory are used for simulating the light propagation and optimizing the structural parameters at 3-D guiding geometry. The designed $2{\times}2$ PC-MMIC does not work well for quasi-TM mode case due to the bending structure, and it does not exist 3dB coupling property, in which the power splitting ratio is 50%:50%, for quasi-TE mode case. Further, the coupling efficiency is better when the signal is incident at channel with large curvature radius than small curvature radius.

• KIPE Magazine
• /
• v.24 no.5
• /
• pp.58-63
• /
• 2019

• Proceedings of the Korean Information Science Society Conference
• /
• 2008.06b
• /
• pp.451-455
• /
• 2008

PC 기술의 발전으로 사용자는 하나의 물리적인 컴퓨터에서 서로 다른 운영체제를 실행하는 작업이 가능하게 되고 서버에서는 하드웨어의 교체로 인한 특정(MIPS, PowerPC)하드웨어에서 서비스 되고 있는 프로그램을 다른 하드웨어에 이식하는 경우의 재개발 비용 없이 성능을 개선할 수 있게 되었다.Virtualization 기술은 PowerPC기반의 서버 프로그램을 X86기반의 개인용 컴퓨터에 이식하는 경우와 같이 다양한 하드웨어 프로그램 개발 환경을 제공해 준다. 본 논문에서는 일반 사용자가 Virtualization을 사용하여 USB 장치를 사용할 수 있게 하는 다양한 방법들을 논한다. 이를 구현하기 위해 리눅스 커널 2.6의 특징인 모듈화를 이용하며 USB 디바이스에 대한 가상화 모듈을 구현하여 VMM (Virtual Machine Monitor)이 USB를 지원하도록 한다. 따라서 GuestOS(가상화하여 실행중인OS)에서는 별도의 개발 없이 USB를 사용할 수 있다.

• Journal of Magnetics
• /
• v.17 no.2
• /
• pp.133-137
• /
• 2012

We investigated the effects of pulsed magnetic fields (PMF) stimulus on electroencephalogram (EEG) alpha activity and heart rate variability (HRV) from electrocardiogram (ECG) measurements with various stimulus durations at acupoint PC9. The alpha activity in the EEG and the ratio of low frequency power and high frequency power (LHR) in the HRV, a reflection of sympathovagal activity, were increased and decreased, respectively, after PMF stimulus of 3 min. Our spectral analysis quantitatively proved that the changes in the EEG alpha activity were consistent with an autonomic function in the ECG. These findings suggest that appropriate PMF stimulus results in the same effect as that of acupuncture applied to the acupoint PC9, which is closely related to the parasympathetic activity of the autonomic nervous system.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.10d
• /
• pp.236-239
• /
• 2006

무선 센서 네트워크에서는 에너지 제약이라는 특징 때문에 에너지 효율과 관련된 많은 연구가 진행되고 있지만 대부분의 연구는 에너지를 보존하기 위해 센서노드의 작업을 줄이는 소극적인 방식을 취한다. 이에 반해 파워 컨트롤 기법은 전송 파워를 조절하여 불필요한 에너지 소모를 줄이는 적극적인 방식이다. 본 논문에서는 무선 센서 네트워크의 클러스터 기반 라우팅 프로토콜인 LEACH(Low-Energy Adaptive Clustering Hierarchy)에 파워 컨트롤 기법을 적용한 LEACH-PC(LEACH-Power Control)를 제안하였다. LEACH-PC는 클러스터 구성에 사용한 RSSI(Received Signal Strength Indicator) 정보를 이용하여 클러스터 내부 통신 단계에서 파워 컨트롤을 수행한다. LEACH-PC는 에너지 효율성 측면에서 기존의 LEACH 보다 좋은 성능을 보임을 실험을 통해 확인할 수 있었다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.17 no.3
• /
• pp.730-739
• /
• 2013

More than 30% of energy in Korea was spent in lighting part and then the consumption level and $CO_2$ emission will be increase from now. In this like situation, control-system construction for street-lamp of a smart grid-based that it has important meaning. Nowadays as a result, as an trying to utilize using Power-line-network communication modem and application a terminal in industrial fields, in this paper, we are want to implement the Power-line-network communication control system of PC-based. Therefore it will be use varied communication test-equipment and tools through the system. For experimentation, using the MODEM was able to use Planet production of based on the ZIC protocol and then the application program use the LabView. The result is primarily focused on equipments control by the PLC, and that we are able to perform each test with PLC equipment for experiment it.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.15 no.4
• /
• pp.266-273
• /
• 2010

The main function of the power conditioning system (PCS) is grid-connection with renewable system. The level of total harmonic distortion(THD) caused by the PCS should be maintained less than 5% according to the IEEE-1547 regulation. The THD is measured by the dedicated instrument, not by the PCS in the domestic products. There should be the necessity for harmonic measurement by the PCS in order to cope with degradation or fault condition. In this paper, the real-time harmonic measurement technique using highperformance DSP controller is presented. The proto-system is manufactured using 32-bit floating DSP processor and tested with 256-point DFT(Discrete Fourier Transform) algorithm. The test result shows that the harmonic calculation time is less than 1 [ms]. It can be used as a auxiliary method for predicting the fault in the PCS system.

• Proceedings of the KIEE Conference
• /
• 2004.11b
• /
• pp.190-193
• /
• 2004

Optimal Power Flow (OPF) is becoming more and more important in the deregulation environment of power pool and there is an urgent need of faster solution technique for on-line application. So this paper presents parallel genetic algorithm-tap search for the solution of the OPF. The control variables modeled unit active power outputs, generator-bus voltage magnitudes and transformer-tap settings. A number of functional operating constraints, such as branch flow limits, load bus boltage magnitude limits and generator reactive capabilities are included as penalties in the fitness function. In parallel GA-TS, GA operators are executed for each process. If best fitness of the GA is not changed for several generations, TS operators are executed for the upper three populations to enhance the local searching capabilities. With migration operation, best string of each node is transferred to the neighboring node after predetermined iterations are executed. For parallel computing, we developed a PC-cluster system consisting of 8 PCs. Each PC employs the 2 GHz Pentium IV CPU and is connected with others through ethernet switch based fast ethernet. To show the usefulness of the proposed method, developed algorithm has been tested and compared on an IEEE 30-bus system in the reference paper. From the simulation results, we can find that the proposed algorithm is efficient for the OPF.

• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.739-740
• /
• 2011

최근 변전소용 IED는 IEC61850의 적용을 기점으로 하여 기술적으로 더 많은 발전을 거듭하고 있다. IED에 더 다양한 기술을 포함하면서 안정적이고 확실한 동작을 요구하는 것은 기본이고, 사용자 위주의 Interface와 편리한 관리 도구도 요구되어 진다. 이에 따라 IED를 PC로 제어하고 관리하기 위한 소프트웨어 또한 기술적으로 발전해야 하는 상황이다. 소프트웨어는 기본적으로 실시간 관리와 프로젝트 관리 그리고 다수의 IED지원 등의 기능을 가져야 하며 이를 구현하기 위하여 여러 가지 방식의 아키텍처 패턴이 적용될 수 있다. 본 논문에서는 IED를 관리하는 소프트웨어에 적용될 수 있는 아키텍처를 제시함으로써 소프트웨어 구현에 대한 방향을 모색해 보았다.