• International Journal of Internet, Broadcasting and Communication
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• v.10 no.4
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• pp.6-11
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• 2018

As embedded memory technology evolves, the traditional Static Random Access Memory (SRAM) technology has reached the end of development. For deepening the manufacturing process technology, the next generation memory technology is highly required because of the exponentially increasing leakage current of SRAM. Non-volatile memories such as STT-MRAM (Spin Torque Transfer Magnetic Random Access Memory), PCM (Phase Change Memory) are good candidates for replacing SRAM technology in embedded memory systems. They have many advanced characteristics in the perspective of power consumption, leakage power, size (density) and latency. Nonetheless, nonvolatile memories have two major problems that hinder their use it the next-generation memory. First, the lifetime of the nonvolatile memory cell is limited by the number of write operations. Next, the write operation consumes more latency and power than the same size of the read operation.These disadvantages can be solved using the compiler. The disadvantage of non-volatile memory is in write operations. Therefore, when the compiler decides the layout of the data, it is solved by optimizing the write operation to allocate a lot of data to the SRAM. This study provides insights into how these compiler and architectural designs can be developed.

• Vacuum Magazine
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• v.3 no.2
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• pp.4-10
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• 2016

Photovoltaic technology has been intensively developed as one of the most powerful renewable energies, replacing a fossil fuel such as coal and petroleum. Every country in the world has emphasized on development of photovoltaic technology and our government has invested heavily in low cost and high efficiency. Korea institute of industrial technology (KITECH) has lastingly constructed PV R&D infra for development of cost-effective and high efficiency solar cells as well as support of commercialization in PV's small and medium enterprises. In this paper, we introduce the next generation PV R&D and infra in KITECH.

• Proceedings of the KIEE Conference
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• 2003.10b
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• pp.83-85
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• 2003

This paper presents a speed control of permanent magnet synchronous motors (PMSM) using an adaptive integral binary observer without speed and position sensors. In view of composition with a main loop regulator and an auxiliary loop regulator, the binary observer has a property of the chattering alleviation in the constant boundary layer. In order to improve the steady state performance of the binary observer, the proposed adaptive integral binary observer is formed by adding extra integral dynamics to the switching hyperplane equation. The effectiveness of the proposed system is conformed by the experimental results.

• Proceedings of the KIEE Conference
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• 2003.10b
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• pp.144-146
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• 2003

This paper presents a new speed sensorless control algorithm of a permanent magnet synchronous motor based on instantaneous reactive power. The proposed algorithm is constructed by instantaneous reactive power in the stationary reference frame and is not affected by mechanical motor parameters, because mechanical equation is not used. The effectiveness of the proposed algorithm is verified by the experimental results.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.06a
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• pp.61-70
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• 2000

This paper described the current status of machine tool technology and its future trends with a particular emphasis on high-speed machining. People in machine tool industry have continuously sought to serve fast-changing manufacturing industry with economical machining solutins. At presents, it appears that more productivity gain is demanded to shorten time-to-market and machining requirements become more stringent. In this regard, this paper firstly addressed a high-speed spindle as a key element for the next-generation machine tools. The sequel to it apparently went to high-speed feed axes and final discussion included the problem of how to optimize overall system including servo function. Lastly a brief look to NC technology including machine intelligence was taken.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.6
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• pp.1209-1216
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• 2012

Smart TV is approaching as a new media service to integrate the broadcasting and the internet according to the technology evaluation of convergence to broadcasting, telecommunication, and computing. Therefore, This paper proposes the next generation smart TV(Smart TV 2.0) technology based on CPNT which supports those services such as the broadcasting, telecommunication, a convergence of broadcasting & communication, and computer service through multi-screen. Also, this paper describes the concept and details of the related technologies.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.286_287
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• 2009

In this paper, the protectability of distance relay is furtherly researched. Based on the probabilistic modeling of the measurement errors, the protectability of three zones is presented in detail by considering their different protection aims denoted by sensitivity and selectivity. The optimal setting for the each zone can be obtained to provide a reference for the practical application.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.62-64
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• 2006

With the advent of the international standard IEC 61850 for communication networks and systems in substations, utilities are beginning to implement substation automation systems (SAS) that can give support to interoperability, interchangeability and self-description features. This paper describes with the SAS design accordance with this new standard. After a brief introduction of IEC 61850 SCL, this paper addresses some issues related to the specification of an IEC 61850 based SAS, and describes the Substation Configuration Language (SCL) based on Extensible Markup Language (XML). The SAS design process is explored with examples including the Intelligent Electronic Device (IED) selection, Logical Nodes (LN) allocation and the related services and the SAS communication architecture.

• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.317-319
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• 2006

This paper proposes a fault location algorithm for two-parallel transmission line in the case of single line-to-ground fault Proposed algorithm is using voltage and current measured in the sending-end. The fault distance is simply determined by solving a second order polynomial equation due to the direct circuit analysis. The simulations by PSCAD/EMTDC have demonstrated the accuracy and effectiveness of the proposed algorithm.

• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.21-23
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• 2006

As a general rule for evaluating dependability of a system, reliability is commonly considered which barely rays attention to the system behavior, however the estimation is based on the assumption of a fault-frost system, which may be impracticable and inaccurate especially for complicated system. This paper introduces a security and dependability integrated approach to analyze the availability of a fault-active system both from dependability and security points of view. Two fault modes involved are discussed about the impairment to the system reliance. The approach can be well applied to estimate and quantify the attribute of system robustness with the help of Markov chain process, which is good at solving status related problem. The comparison result between dual system and IEC61850-based almighty backup system is shown to sup-port the suggested approach.