• Review of KIISC
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• v.28 no.1
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• pp.22-28
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• 2018

패스워드, PIN, 패턴 락, 지문 인증 등은 현재 가장 널리 사용되고 있는 모바일 장치의 사용자 인증 수단이다. 그러나 사용자가 기억의 편의성을 위해 쉬운 패스워드를 반복 사용한다는 것은 널리 알려진 사실이며 이를 보완하기 위해 개발된 그래픽 패스워드, 또는 지문 등 생체 인증은 사용성 개선을 이루어냈으나 여전히 사용성, 안전성에서 많은 취약점이 보고되고 있다. 본 논문에서는 모바일 장치에서의 인증 기법에 관한 연구동향을 살펴보고 분석한다.

• The Magazine of the IEIE
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• v.3 no.2
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• pp.36-45
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• 1976

오늘날 실시되고 있는 각국의 칼라/흑백 TV 방송의 표준은 잡다한 것 같으나 간추리면 525/60625/50의 2개방식을 NTSC, PAL 및 SECAM의 칼라 3방식으로 채택하고 있다. 한편 통신위성에 의하여 TV방송프로는 국제간에 하시하처에서나 즉시중계가 가능해야하기 때문에 또 앞으로는 방송위성이 등장하게 됨으로 이 표준방식변환(TSC)장치가 꼭 필요하고 매우 중요하게 되었다. 본고에서는 일본 NHK방송센터에 설치된 인터레이스내주사선내압방식 디지털 TSC를 중심으로 TSC의 발달, 표준변환의 원리, 또 여기쓰이는 기억소자로서의 메모리 유형 및 최신의 TSC연구방향으로서 프레임 내주사선내압방식디지털 TSC등을 간약하게 해설하고져 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.1163-1164
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.317-318
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• 2010

• The Science & Technology
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• v.17 no.1 s.176
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• pp.22-25
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• 1984

자연식에도 발암물질있다 / 폐열이용 수경재배 / 레이저추적장치로 비행기연료 크게 절약 / 대기시간 신호표시판 / IBM, 조셉슨 소자 컴퓨터 연구중단 / 플라스틱 포도주병 / 택시의 컴퓨터 배차 / 영상을 기억하는 컴퓨터 등장 / 싼비용으로 백만불 미소를 / 로스알라모스연 소련여행 금지 / 자연질소의 바다로 덮인 트리톤

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.193-194
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• 2013

• Journal of Korea Multimedia Society
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• v.3 no.5
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• pp.526-534
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• 2000

There have been many researches on the 3D graphic accelerator for high speed by needs of CAD/CAM,3D modeling, virtual reality or medical image. In this paper, an SIMD processor architecture for 3D graphic accelerator is proposed in order to improve the processing time of the 3D graphics, and a parallel Phong shading algorithm is presented to estimate performance of the proposed architecture. The proposed SIMD processor architecture for 3D graphic accelerator consists of PCI local bus interface, 16 Processing Elements (PE's), and Park's multi-access memory system (NAMS) that has 17 memory modules. A serial algorithm for Phong shading is modified for the architecture and the main key is to divide a polygon into $4\times{4}$ squares. And, for processing a square, 4 PE's are regarded as a PE Grou logically. Since MAMS can support block access type with interval 1, it is possible that 4 PE Groups process a square at a time. In consequence, 16 pixels are processed simultaneously. The proposed SIMD processor architecture is simulated by CADENCE Verilog-XL that is a package for the hardware simulation. With the same simulated results as that of the serial algorithm, the speed enhancement by the parallel algorithm to the serial one is 5.68.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.40 no.4
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• pp.353-362
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• 2020

Korea was recognized as a relatively safe area for earthquake. However, due to considerable damage to facilities caused by the earthquake in Gyeongju and Pohang, interest in the maintenance and repair of structures is increasing. So interest in vibration damping technology applicable to existing structures is also increasing. However, vibration damping technology has a problem in that its usability is reduced due to damage of the damping device when a strong earthquake occurs. Recently, in order to solve such a problem, study is being conducted to apply a superelastic shape memory alloys (SSMA) capable of recentering bracing. Therefore, in this study, nonlinear dynamic analysis is performed to evaluate the seismic performance of the buckling-restrained braced frame (BRBF) applied SSMA to bracing.

• Journal of Korea Multimedia Society
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• v.13 no.9
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• pp.1272-1284
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• 2010

As the mobile computers are becoming powerful and are used like general-purpose computers, operating systems for mobile computers also require swap system functionality that utilizes main memory efficiently. Flash memory is widely used as storage device for mobile computers but current linux swap system does not consider flash memory. Swap system is tightly related with process execution since it stores the contents of process in execution. By taking advantage of this characteristics, in this paper, we study a new linux swap system called PASS(Process-Aware Swap System), which allocates the different flash memory blocks to each process. Trace-driven experimental results show that PASS outperforms existing linux swap system with existing garbage collection schemes in terms of garbage collection cost.

• Journal of the Korea Society of Computer and Information
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• v.19 no.12
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• pp.21-29
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• 2014

In this paper, we propose an efficient Robot Performance System (RPS). For the proposed system, a soundboard was developed and inserted into the body of a humanoid robot to enable audio playback without an external playback device; the hardware required to enable the external storage device within the soundboard to remember the sound sources necessary for performances was developed. Furthermore, a specialized performance scenario planning software called Robot Performance Planning Development Program (RPPDP) was developed to allow users to search through a motion database for the robot's default motions, applied motions, and motions for special circumstances, allowing anyone to plan a robot performance at a low cost in a short amount of time.