• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.649-650
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• 2008

In order to resolve mechanical limit in HDD, recently, the hybrid hard disk combining HDD and a flash memory was launched. In this paper, we propose a simulator for hybrid hard disk which considers redirection, flushing and spin-down function to complement the difference between HDD and hybrid hard disk. The simulator was implemented in linux kernel 2.6.20 by modifying system calls related with file system. The experiment shows that the power consumption of hybrid hard disk is 47% smaller than that of hard disk in laptop PC.

• 한국컴퓨터산업학회논문지
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• 제8권4호
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• pp.245-252
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• 2007

본 논문은 기존 전용선을 이용하는 대신에 PLC(Power Line Communication)를 이용하여 인터넷성능을 평가하고자 한다. 많은 통신망 장비와 작업의 어려운 문제를 단순히 전력선만으로 해결하고자한다. 이와 같이 전력선으로 인터넷을 이용하면 작업의 어려운 문제뿐만 아니라 초기 비용적인 측면에서도 크나큰 이득이 될 수 있다. 따라서 본 논문은 전력선을 이용하여 인터넷 이용이 어느 수준까지 활용할 수 있는가를 평가, 고찰해보고, 향후 전력선으로 인터넷을 활성화할 수 있는가에 대해 타당성을 고찰하였다.

• 영어영문학
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• 제58권1호
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• pp.3-19
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• 2012

This paper argues that the hard-boiled detective fiction is not a commercialized imitation of the classical detective novels but a revisionist detective fiction. Producing a radically different type of detectives from the traditional ones, the hard-boiled detective fiction provides a new, opposing paradigm of criminality, class, and masculinity to the classical detective fiction. Classical detective novels, through the heroic portrayal of high-class detectives capturing and punishing lower-class criminals, reassure class hierarchy. Hard-boiled detective novels, however, representing the ruling classes as the root of social oppression and political corruption, define the power elite as criminals. Whereas the classical detective fiction displays aristocratic masculinity, the hard-boiled detective fiction embodies working-class masculinity. The classical detective is generally represented as a genteel dilettante solving the mysteries of crimes, in his leisure time, through logical reasoning and scientific techniques. The hard-boiled detective, however, solves crimes by using violence and earns his living from catching criminals. The hard-boiled detective also maintains an absolute independence by keeping a distance from all forms of authority and connection. The representation of hard-boiled detective as a tough, rebellious, independent guy can be interpreted as a reaction to the advent of corporate capitalism and the rise of labor control in the 1920s.

• 한국화재소방학회논문지
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• 제30권3호
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• pp.62-66
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• 2016

화력발전소는 중대형사고의 발생위험이 높은 고위험군 건물로 다양한 원인에 의하여 크고 작은 화재 등이 발생하고 있어 화력발전소 현장에서는 '화력발전분야 현장조치 행동 매뉴얼'을 배포하고 정기적인 교육 및 훈련을 통하여 화재 등 재난발생률을 최소화하기 위하여 힘쓰고 있다. 그러나 현재 국내 5개 화력발전회사에서 사용되는 교육자료는 대부분 가독성 낮은 인쇄물(Hard Capy) 형태이며, 발전화사별, 사업소별로 상이하게 구성된 점이 있어 표준화 작업이 요구된다. 그러므로 본 연구에서는 국가 중대 기반시설인 발전소의 재난대응력을 향상하기 위한 방법으로 '화력발전분야 현장조치 행동 매뉴얼'의 '유류화재 전기화재 건물화재 설비화재 가스누출 대응 SOP' 5개 부분에 대하여 매뉴얼 표준화 작업을 진행하고, 이를 바탕으로 인쇄물(Hard Capy)형 재난매뉴얼을 보완할 수 있는, 스토리뷰잉(Story-viewing) 기법을 적용한 시각화 기반 화력발전분야 안전교육 콘텐츠를 제안하고자 한다.

• 대한전기학회논문지:전력기술부문A
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• 제52권1호
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• pp.58-61
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• 2003

A loop power system has a nonlinear characteristics. Also it is very hard to analyse through a equation if a discontinuous characteristic of the ULTC is added to a system. However, the problem which is hard to analyse by equations can acquire the useful result with what use the genetic algorithm (GA) which is a multi-point search program. In this paper, we proved through a simulation that the proposed method can reduce an operation frequency of tap changers and improving the quality of voltage of the buses by decreasing the deviation between the actual voltage and the reference voltage through the coordinated control of the ULTC that use GA in the loop power system.

• JSTS:Journal of Semiconductor Technology and Science
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• 제4권3호
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• pp.204-209
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• 2004

A partial matched filter (PMF) for semi-coherent correlation code acquisition of the DSSS-CPFSK signal is proposed. It is a calculation-reduced structure of the hard-limited signal based FIR filter, yet its code acquisition time is equal to that of the hard-limited signal based FIR filter. The PMF eliminates duplicate calculations by utilizing the characteristic that the hard-limited DSSS-CPFSK signal has same value in several consecutive samples. For example, the PMF can achieve about 95% reduction in gate size, as compared to the hard-limited signal based FIR filter, when the modulation index of the DSSS-CPFSK signal is equal to 1.5 and the sample rate is equal to 40 sample/chip.

• 설비공학논문집
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• 제3권3호
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• pp.206-214
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• 1991

Flow field in a hard disk drive has been predicted numerically. Theoretical model was constructed based on a commercially available hard disk drive with 40 Mega byte capacity. Since the gap between disk tip and shroud is not homogeneous in real hard disk drive, three kinds of gap size have been tested as computational model. The discussion has been made on the circumferential velocity, radial velocity, and pressure fields. As a result, the average shear stress on the disk surface was reduced as the gap size decreased. This means that the shroud should be designed compactly to reduce power consumption of the spindle motor.

• 한국전자통신학회논문지
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• 제6권5호
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• pp.665-671
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• 2011

하이브리드 하드디스크(Hybrid hard disk drive: H-HDD)가 SSD(Solid state drive)에 비해 경쟁력을 갖기 위해서는 저전력, 읽기 속도가 핵심 요소이다. 본 연구에서는 H-HDD에 장착되어 있는 비휘발성 메모리에 디스크 블록을 선반입하여 저전력과 응답시간을 향상시킬 수 있는 기법을 제안한다. 제안하는 기법의 핵심은 시스템파일이나 자주 사용되는 파일은 파일단위로 캐싱하고 나머지는 블록단위로 선반입한다. 선반입은 디스크 큐를 서비스하고 남은 여유 시간에 우선순위가 높은 블록부터 실행되며 이때 사용되는 우선순위는 시간적, 지역적 지역성을 동시에 고려하여 결정된다. 실험 결과 제안 기법은 기존 기법에 비해 전력소모가 낮고 응답시간이 향상되었음을 확인하였다.

• 한국표면공학회지
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• 제52권6호
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• pp.326-333
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• 2019

The microporous carbon derived from PVDC-resin by a simple heat-treatment under an inert atmosphere exhibits a reasonable specific capacitance for a supercapacitor's electrode. However, the capacitance was rapidly decreased at high charge/discharge rate. The micropores present in an electrode surface hinder the entrance of an electrolyte ion onto the entire surface. To induce the meso-sized pores during the carbonization of PVDC-resin, Mg(OH)₂ was utilized as a hard template. The porous carbon made from the mixture of PVD-Cresin and Mg(OH)₂ include mesopores as well as micropores. The induced mesopores does not homogeneously distributed on the entire surface of the synthesized carbon. The PVDC-resin and Mg(OH)₂ are dissolved in the dimethylformamide for the hard template to evolve the pores on the synthesized carbon uniformly. The carbon made from PVDC-resin with solvent and a hard template contains mostly mesopores resulting in the high power performance. The reduced amount of solvent in the precursor derives the carbon with high specific surface area and high power density.

• 한국전기전자재료학회논문지
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• 제21권7호
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• pp.660-664
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• 2008

Titanium nitride (TiN) thin films are widely used for hard coatings due to their superior hardness, chemical stability, low friction and good adhesion properties. In this study, we investigated the effect of DC power on the characteristics of TiN thin films deposited on Si and glass substrates by DC magnetron sputtering using TiN target. We made TiN films of 300 nm thickness with various DC powers. The structural properties of films are investigated by x-ray diffractions (XRD) and tribological properties are measured by nano-indentation, nano-scratch tester. The rms roughness was measured by atomic forced microscopy (AFM). In the result, TiN films had the smooth surface and exhibited (111) directions with the increase of DC Power. Also, especially in case of 175 W DC power, TiN film exhibited the maximum hardness about 8 GPa, and the critical load near 25.