• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.4
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• pp.189-194
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• 2012

The main purpose of reactive power compensation monitoring system is to manage factory electrical installation efficiently by On-Off switching reactive power compensation equipment. The existing reactive power compensation monitoring system is only able to be managed by operator whenever electrical installation needed reactive power. Therefore, it may be possible for propagating the installation's faults when operator make the unexpected mistakes. To overcome the unexpected mistakes, in this paper, the author presents a reactive power compensation monitoring system for factory electrical installation using active database. by using active database production rule, stated system can minimize unexpected mistake and can operate centralized monitoring system efficiently. Test results on the five factory electrical installations show that performance is efficient and robust.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10a
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• pp.189-192
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• 2006

본 논문은 그래픽 가속기를 포함한 모바일 시스템에서 멀티미디어 응용을 위한 통합전력관리 기법을 제안한다. 가속기가 포함된 시스템이 멀티미디어 프로세스를 실행할 때 QoS를 유지하면서 에너지 절약을 하기 위해서는 가속기의 특징을 고려한 DVS 알고리즘이 필요하다. 그러나 기존 DVS 알고리즘은 CPU 위주로 연구된 알고리즘이여서 가속기가 포함된 시스템에 적용하는 것은 문제가 있기 때문에 CPU와 가속기의 특징을 고려한 통합전력관리 DVS 방법이 필요하다. 제안된 DVS 스케줄링은 리눅스 운영체제 상에 구현하였으며 Intel 2700G 그래픽 가속기가 포함된 Xscale 장치에서 실험을 하였다. 따라서 제안된 DVS 기법이 범용적인 프로세스의 QoS를 보장하면서 에너지 소비를 CPU위주로 연구된 알고리즘보다 평균 12.5% 줄일 수 있음을 밝혔다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.6
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• pp.1321-1326
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• 2015

The amount of smart phones has increased exponentially. Due to the periodic release of high-performance smart phones and upgraded operating system, new smart phones become out-dated over 1 or 2 years. In order to solve environmental constraints of these smart phones, virtualization technology using Thin-Client terminal has been developed. However, in the case of Virtual Machine(VM), the applications associated with sensors and a GPS device can not run because they are not included. In this paper, by implementing the device driver for Android running in a virtual machine in the x86-based systems, it is to provide Android virtualization capabilities such as using the latest smart phones in the virtual machine environment. It would like to propose a method that the virtual device driver receives sensors and GPS information from the old Android smart phones(Thin-Client) that actually work and run as if the real device exists.

• Journal of the Korea Society of Computer and Information
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• v.16 no.6
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• pp.21-30
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• 2011

In the global IT market, a lot of issues for responding to various environmental regulations emerged. In case of the data centers, it is consuming huge amounts of energy to maintain. So there have been various technical attempts as Consolidation, Virtualization, Optimization to efficiently manage energy and data storage to fix the problems. In this paper, we propose a new RAID(Redundant Array of Independent Disks) mechanism which is differing the intensity of power consumption and works to provide data protection and disaster recovery(backup, mirroring etc.) to stratify multiple volumes. G-RAID minimize the power consumption and the lower of I/O performance by selecting the volume depending on the frequency of data access while classifying the power consumption between volumes in storage system. Also, it is possible that a filesystem and block map information of G-RAID is processed by basic unit which is group located in a row for the blocks to work efficiently and can minimize the performance degradation of block mapping load by the access frequency in each groups. As a result, we obtained to elevate a little bit of response time caused by block relocation work, but showed the decrease of power consumption by 38%.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.979_980
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• 2009

본 논문에서는 PHEV와 EV의 보급 확대에 따른 충전 시스템 사용자 혹은 관리자의 사고 방지 및 효율적인 충전 시스템의 운용을 위해서 차량내 배터리와 충전 시스템의 상태를 모니터링 할 수 있는 충전 모니터링 시스템의 구조와 충전 프로세스 알고리즘을 제안하고자 한다. 충전 모니터링 장치는 유/무선 통신기술을 적용하여 차량을 식별함으로써 효율적인 차량 관리 및 충전 시스템 운용이 가능하며 충전 시스템 내의 정보 교환, 충전 동작/정지 제어 등을 위한 차량과의 인터페이스 기술과 통신 프로토콜 등 다양한 기능이 필요하다. 본 논문에서는 충전 모니터링 장치용 제어기와 충전 전력량 및 상태 표시가 가능한 충전 모니터링 장치와 충전 알고리즘을 제안한다.

• Journal of Internet of Things and Convergence
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• v.10 no.2
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• pp.125-130
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• 2024

With the rapid growth of mobility technology, the industrial sector is demanding storage devices that can reliably process data from various equipment and sensors in vehicles. NAND flash memory is being utilized as a storage device in mobility environments because it has the advantages of low power and fast data processing speed as well as strong external shock resistance. However, flash memory is characterized by data corruption due to long-term exposure to high temperatures. Therefore, a dedicated system for temperature management is required in mobility environments where high temperature exposure due to weather or external heat sources such as solar radiation is frequent. This paper designs a dedicated temperature management system for managing storage device temperature in a mobility environment. The designed temperature management system is a hybrid of traditional air cooling and water cooling technologies. The cooling method is designed to operate adaptively according to the temperature of the storage device, and it is designed not to operate when the temperature step is low to improve energy efficiency. Finally, experiments were conducted to analyze the temperature difference between each cooling method and different heat dissipation materials, proving that the temperature management policy is effective in maintaining performance.

• Journal of the Korea Society of Computer and Information
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• v.26 no.11
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• pp.11-19
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• 2021

In this paper, we propose a prototype platform combined with the power management system using, as an auxiliary power storage device, a supercapacitor that can be fast charged and discharged with high power efficiency as well as semi-permanent charge and discharge cycle life. For the proposed platform, we designed a technique which is capable of detecting the state of power cutoff or resumption of power supplied from the solar panel in accordance with physical environment changes through an interrupt attached to the micro-controller was developed. To prevent data loss in a computing environment in which continuous power supply is not guaranteed, we implemented a low-level system software in the micro-controller to transfer program context and data in volatile memory to nonvolatile memory when power supply is cut off. Experimental results shows that supercapacitors effectively supply temporary power as auxiliary power storage devices. Various benchmarks also confirm that power state detection and transfer of program context and data from volatile memory to nonvolatile memory have low overhead.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.328-329
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• 2010

STATCOM은 전력전자 기반의 전압형 인버터를 이용한 무효 전력 보상장치로써 우수한 전압 제어 능력과 빠른 동작 특성, 그리고 운용 및 유지/관리의 유연성으로 인해 기존에 사용되던 무효 전력 보상장치들을 빠르게 대체하고 있다. 효성중공업에서는 국내 최초로 100MVA STATCOM을 개발하여 한전 실 계통에 설치/운용한 바 있고 이 경험을 바탕으로 최근 논의되고 있는 제주 50MVA STATCOM의 개발에 착수하였다. 본 논문에서는 이 프로젝트와 관련된 배경을 설명하고 연구 과정 중에 수행된 제주 전력 계통의 STATCOM 설치 효과 모의 결과에 대해서 소개하고자 한다.

• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.49-52
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• 2000

본 논문에서는 전력선 기반의 홈네트워크에 연결된 장치들을 원격에서 PDA나 웹을 통해 모니터링하고 제어할 수 있는 홈게이트웨이 프로그램을 제안한다. CEBus 장치와 Low rate의 전력선 모뎀을 지원하며 서버 프로그램은 C++로 짜여져 있다. 웹브라우저를 통해 홈네트워크에 액세스할 경우, 자바 애플릿의 UI 프로그램이 클라이언트에 다운로드 되어 이를 통해, 홈네트워크를 장치를 제어한다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1232-1233
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• 2011

본 개발은 에너지 수요관리, 전력품질감시, 전기안전감시 및 설비감시가 가능한 정보통신실 기반설비용 전원분배장치 운용 S/W 개발에 관한 것으로써, 분전반 단위의 전력 및 에너지 관련정보, 전기기기 및 에너지 상태 정보, 장치 상태 정보를 실시간으로 취득 원격에서 감시 및 분석/통계 할 수 있다.