• KIEE International Transactions on Power Engineering
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• v.3A no.1
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• pp.1-6
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• 2003

As power systems grow more complex and power demands increase, the fault current tends to gradually increase. In the near future, the fault current will exceed a circuit breaker rating for some substations, which is an especially important issue in the Seoul metropolitan area because of its highly meshed configuration. Currently, the Korean power system is regulated by changing the 154 ㎸ system configuration from a loop connection to a radial system, by splitting the bus where load balance can be achieved, and by upgrading the circuit breaker rating. A development project applying 154 ㎸ Superconducting Fault Current Limiter(SFCL) to 154 ㎸ transmission systems is proceeding with implementation slated for after 2010. In this paper, the resistive and inductive SFCLs are applied to re-duce the fault current in Korean power system and their technical and economic impacts are evaluated. The results show that the application of SFCL can eliminate the need to upgrade the circuit breaker rat-ing and the economic potential of SFCL is evaluated positively.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.5B
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• pp.511-516
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• 2011

In this paper, we present the AMI System mentioned as one of the main application areas in the M2M. To enable the AMI, it is essentially required to install, deploy and manage all the devices. Especially, Device Management technology is considered to be suitable for these AMI due to its advantages like, easy installation, remote FW/SW upgradeability. We investigate the fundamental operation of the DM and the design of the DM in the AMI is presented.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1991-1992
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• 2011

스마트미터링 혹은 스마트미터의 기본 요구사항 중 하나는 AMI 환경의 장비들에 대한 펌웨어 원격 업그레이드 기능이다. 수동적인 H/W 장비의 교체 없이 S/W 및 펌웨어 교체만으로 변화되는 환경에 유연하게 대체할 수 있도록 하며 다양한 부가서비스 창출 및 사업화지원을 위해서 시스템을 주기적으로 유지보수함으로써 유지보수에 필요한 인건비를 절감 한다는 측면과 서비스의 즉시성 측면에서 매우 중요하다. 본 논문에서는 AMI 시스템 개발 시작품 중 데이터수집장치 및 스마트 미터를 대상으로하는 원격 펌웨어 업그레이드시스템(FUMS, Firmware Upgrade Management System)의 국제적 수준의 일반적 요구기능과 시스템 설계 내용을 제시한다.

• Journal of the Korean Society of Systems Engineering
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• v.11 no.1
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• pp.67-72
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• 2015

It has been tested for SW reliability in order to prevent the SW error during the development of weapons systems. According to a recent report, defects such as memory leak, buffer overflow, and null deference occur usually in the development stage, but also in the mass production stage. Although it is intended to enhance the SW test and evaluation to prevent SW failures in the development stage, the non-functional problems like syntax errors are not completely revised due to the limitation of the schedule and costs. In addition, SW failure rate are usually fluctuated by the operational environment through SW upgrade in contrast with HW. In this paper, we propose a method to increase SW reliability in the mass production stage of Korean weapon systems.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.629-631
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• 2005

The DASPRO (Protection Coordination Program for DAS) is one of the application programs for Distribution Automation System (DAS) of the KEPCO. Application programs developed by KEPCO provide optimal operation in distribution network. The DASPRO includes diverse functions to operate network as construction of database using existing information. creation of diagram for protection coordination. calculation of fault current. evaluation network. power quality monitoring, etc. The DASPRO can examine validity of setting values for protective devices by comparing to T-C curves. Unless the protection coordination is correct, the most suitable setting value for protection devices are displayed on the screen. In this paper, I will introduce the contents of the DASPRO.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.32B no.1
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• pp.21-29
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• 1995

In this paper, a independent and structured microassembler was designed for easily changing the system design, and for designing various microarchitecture. When the designer's hardware and microprogramming process were made concurrently, it is needed to easily change or improve the instruction set and executable code format. But this type of developed environment requires a high const and a large software system. A proposed microassembler was designed so the designer directly defines the microinstruction set and format to be executed. And we implemented a module from each part of the software, so it is now possible to use practically and upgrade the function of each part, First, the symbol was separated from the assembler. And then microinstruction was copied into it. The microinstruction format was designed using the defined language that was designed for free microinstruction. This was implemented in an IBM-PC by using the C-language, FLEX,and BISON.

• Proceedings of the Korean Geotechical Society Conference
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• 2007.09a
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• pp.431-439
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• 2007

Data logger is generally needed for gathering field information automatically(or manually), using various sensors. However it, currently used in the county, is produced and developed by overseas. It is difficult to upgrade related program due to developed system and limited user in terms of environment it is used. On the other hand, several companies developed and sold unique data logger based their technique expertise in the country. But enhancement and practical use of related technology has much difficulties because feasibility, marketability and demand for technique are uncertain. In this study, it is the main purpose to offer basic information to select equipment suitable for field characteristic through analysis and comparison with features about method of information collection, operating program and process technique data logger which is used primarily in geotechnical engineering in both domestic and international.

• Journal of Korean Library and Information Science Society
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• v.34 no.1
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• pp.331-349
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• 2003

This study explores what kinds of strategies are appropriate for the academic libraries to upgrade their services and vitalize their organizational culture. The sources related to the organizational development theory and the organization of the academic libraries are gathered and examined for this study. And this study suggests the realization of team system the development of knowledge management and teaming organization culture, the establishment of strategic plan as the strategies for the organizational development of the academic libraries in Korea.

• Journal of Environmental Impact Assessment
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• v.9 no.2
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• pp.155-161
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• 2000

Environmental impact assessment(EIA), the only preventive system to manage development projects destroying the nature and ecosystem systematically, has been accomplished since the late 1970. EIA connotes intrinsic limits predicting uncertain future with the aid of present data. Furthermore, EIA has been used as not decision-making tools but regulatory means. Therefore, EIA has been criticized severely. In order to present direction of development of EIA, we analyzed problems of management of EIA, and concluded measures as follows are needed. 1. Control of investigation of environmental impact statements 2. Development of evaluating methods and publication 3. Fostering of institute for research and investigation of EIA 4. Construction of harmony of environment and development 5. Upgrade of state of proxy executing EIA.

• Journal of the Optical Society of Korea
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• v.20 no.3
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• pp.368-380
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• 2016

There is no doubt that adaptive optics (AO) is the most promising method to compensate wavefront disturbance in free space optics communication (FSO). In order to improve the performance of the AO system described by discrete-time linear system model with time-delay and implicit phase turbulent model, new controllers based on a Kalman filter and its extensions are proposed. Based on the standard Kalman filter, we propose a fading memory filter to deal with the ruleless strong interference; sequential and U-D filters are applied to reduce implementation complexity for the embedded controllers. Theoretical analysis and the numerical simulations show that the proposed fading memory filter can upgrade the performance for AO systems in consideration of the unforeseen strong pulse interference, and the sequential and U-D filters perform well compared with a Kalman filter.