• 한국전기전자재료학회논문지
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• 제17권2호
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• pp.144-149
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• 2004

Register Controlled DLL with fast locking and low-power consumption, is described in this paper. Delay monitor scheme is proposed to achieve the fast locking and inverter is inserted in front of delay line to reduce the power consumption, also. Proposed DLL was fabricated in a 0.6${\mu}{\textrm}{m}$ 1-poly 3-metal CMOS technology. The proposed delay monitor scheme enables the DLL to lock to the external clock within 4 cycles. The power consumption is 36㎽ with 3V supply voltage at 34MHz clock frequency.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1998년도 추계학술발표회요약집
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• pp.368-368
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• 1998

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.339-340
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• 2010

• 한국콘텐츠학회논문지
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• 제5권1호
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• pp.157-167
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• 2005

본 논문에서는 다차원 색인구조를 위한 새로운 유령방지 기법을 제안한다. 제안하는 유령 방지 기법은 프레디킷 잠금 기법과 그래뉼러 잠금 기법의 특징을 혼합한 방식이다. 제안하는 기법은 다차원 색인구조의 종류에 영향을 받지 않으며, 트리 기반, 파일 기반 및 해시 기반의 색인구조와 같은 모든 색인구조에 적용 가능하다. 또한, 제안하는 기법은 개발비용을 줄이고 잠금 부담이 적게 하면서도 높은 동시성을 제공한다. 그리고 다양한 환경에서의 실험을 통해 제안하는 기법이 다차원 색인 구조를 위한 기존의 유령방지 기법들에 비해 우수함을 보였다.

• 제어로봇시스템학회논문지
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• 제17권8호
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• pp.824-832
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• 2011

An essential consideration to differentiate prosthetic hand from robot hand is its convenience and usefulness rather than high resolution or multi-function of the robot hand. Therefore, this study proposes a myoelectric hand with a 2 DOF auto wrist module which has 6 essential functions of the human hand such as open, grasp, pronation, supination, extension, flexion, which improves the convenience of the daily life. It consists of the 3 main parts, the myoelectric sensor for input signal without additional attachment to operate the prosthetic hand, hand mechanism with high-torqued auto-transmission mechanism and self-locking module which guarantee the safety under the abrupt emergency and minimum power consumption, and dual threshold based controller to make easy for adopting the multi-DOF myoelectric hand. We prove the validity of the proposed system with experimental results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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• pp.86-89
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• 1987

This paper treats with the design and fabrication of a frequency synthesizer for the generation of intermediate frequency of a HF band transceiver. The synthesizer is designed to control frequencies using a phase-locked loop and it is shown that method improved the performance of frequency accuracy and locking time then that of the crystal-reference system.

• 컴퓨터교육학회논문지
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• 제11권4호
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• pp.71-83
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• 2008

정보기술의 발달로 컴퓨터과학에서 다루어지는 주제에 대한 다양한 교수-학습 자료들이 개발되어 왔다. 자료구조, 운영체제, 네트워크, 컴퓨터구조 등에 관련된 교수 학습 자료들은 많이 연구되고 있으나, 데이터베이스 분야는 다른 분야에 비해 미비하다. 데이터베이스 관련 주요 주제들에는 데이터 모델, DB 설계, 정규화, SQL, 질의 처리 기법, 병행제어 기법, 회복 기법 등이 있는데 이들 중 병행제어 기법과 회복 기법은 DBMS의 다른 기능들과 복합적으로 연관되어 있어 학습자들이 학습하는데 어려워하는 주제이다. 학습자들이 이러한 주제들을 보다 쉽게 학습할 수 있도록 하기 위해서는 이들 기법과 관련된 DBMS의 기능들과의 상호작용을 시각화하여 제공할 수 있는 교수-학습 자료가 보다 효과적이다. 본 연구에서는 2PLP 기반 병행제어 과정을 효과적으로 학습할 수 있도록 지원하는 시각화 시뮬레이터를 개발하였다. 제안하는 시뮬레이터는 학습자가 직접 트랜잭션을 작성할 수 있게 하고, 작성된 트랜잭션들을 2PLP에 따라 실행되는 과정을 학습자들에게 시각적으로 보여줌으로써 학습자의 참여를 유도하고, 흥미를 유발하여 2PLP 기반 병행제어에 대한 학습을 효과적으로 수행할 수 있도록 하였다.

• 한국기계가공학회지
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• 제5권3호
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• pp.71-79
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• 2006

ABS is a safety device for preventing wheel locking in a sudden baking. Its control methods are classified into three types; deceleration control, wheel slip control and deceleration/acceleration control. The braking force takes the influence of the friction coefficient between road and tire, which in turn depends on the wheel slip as well as road conditions. In this paper, it has been proposed the wheel slip control system to apply the adaptive control method at the ABS. To maintain wheel slip to desired wheel slip, it have been done the linearization and designed the adaptive controller to apply gradient method based on the reference model. It is illustrated by computer simulations that the proposed control system gives good performances and adaptation to parameter variation.

• 제어로봇시스템학회논문지
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• 제20권5호
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• pp.563-569
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• 2014

This article focuses on a hemispherical resonator gyro driven by the Coriolis effect. A hemispherical shell, called a resonator, is maintained in the resonance state by amplitude control and phase locking control. Parametric excitation has been used to control the amplitude. For rate measurement mode or FTR mode, nodal points have been kept to an amplitude of zero. Angular rate measurement has been demonstrated by rotating a resonator. Frequency mismatch between two stiffness principal axes is a major cause of low performance: vibrating pattern drift and reduced control effectiveness. This mismatch has been reduced significantly by the addition of small mass. A negative spring effect, which lowers resonance frequencies, has been verified experimentally.

• 전자공학회논문지C
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• 제34C권12호
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• pp.9-19
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• 1997

This paper describes the design and FPGA implementation of a system control unit within a multiprocessor chip which can be used as a node processor ina massively parallel processing (MPP) caches, memory management units, a bus unit and a system control unit. Major functions of the system control unit are locking/unlocking of the shared variables of protected access, synchronization of instruction execution among four integer untis, control of interrupts, generation control of processor's status, etc. The system control unit was modeled in very high level using verilog HDL. Then, it was simulated and verified in an environment where trap handler and external interrupt controller were added. Functional blocks of the system control unit were changed into RTL(register transfer level) model and synthesized using xilinx FPGA cell library in synopsys tool. The synthesized system control unit was implemented by Xilinx FPGA chip (XC4025EPG299) after timing verification.