• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2008.05a
• /
• pp.17-20
• /
• 2008

본 논문에서는 After-market에서 자동차 헤드라이트 상 하향 빔 전환 시스템으로 주로 사용하고 있는 solenoid 방식의 여러 문제점을 개선하기 위하여 차량용 릴레이를 이용한 HID램프의 헤드라이트 상 하향 전환 컨트롤 방식를 제안하였다. 특히, 차종에 따라 달라지는 상 하향 빔 전환 입력신호에 대하여 릴레이가 일정하게 상 하향 동작을 할 수 있는 signal selector회로를 구성하고, 두 개의 램프를 relay로 전환하는 방식을 채택함으로서 그 동안 자동차 하우징 구조상 기존 H4 타입에만 국한되어 오던 차량용 HID램프의 헤드라이트 상 하향 빔 전환 시스템을 H1, H3, H7, H11, 9004, 9006, 9007 등 다른 베이스타입의 벌브에도 적용이 가능하도록 하여 우수한 범용성을 갖도록 하였다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.13 no.6
• /
• pp.501-509
• /
• 1988

A new type toroidal core transformer for impedance matching for 30MHz~90MHz has been designed and fabricated. It is shown to be reasonably good characteristics that insertind loss was 1.2[dB], VSWR was 1:2.0 and 100[%] bandwidthe was achieved. It is expected that resulting transformer can be used to replace existing frequency selector type matching network because it is much more compact and relatively easy to contruct.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.57 no.7
• /
• pp.1195-1199
• /
• 2008

In this paper, peak detector of generator's output voltage and variable gain controller are introduced for a fast dynamic response. The conventional r,m.s, signal detected has inherent time delay, and the dynamic response of generator using conventional PID controller has some problem in sudden load change. In this paper, the peak detector and signal selector with variable gain controller is used to overcome this problem. The main controller can check the voltage state from the peak detector. When a sudden load change, the over-voltage and under-voltage signal from peak detector change the controller's gain and exciter's current reference. The proposed scheme can improve the dynamic response, which is verified from experimental test of 200kW diesel engine-generator.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.06a
• /
• pp.280-282
• /
• 2006

대용량 데이터 처리를 위한 SAN(Storago Area Network)는 각 호스트마다 두 대의 HBA(Host Bus Adapter)사용 하며, 한대는 Active로서 활동을 하고 다른 한대는 Active가 동작하지 않을 때를 대비하여 Standby로 사용된다. 현재 리눅스 커널에선 두 대의 HBA를 동시에 사용하여 효율성을 극대화하기 위한 멀티패스를 지원하고 있다. 데이터의 패스는 라운드 로빈 방식에 의해 수행되며 단순히 패스를 돌아가며 선택하는 방식을 사용한다. 라운드 로빈 방식의 패스 셀렉터는 워크로드의 양이 일정하지 못할 경우에는 좋지 않은 성능을 보인다. 본 논문은 워크로드의 양이 일정하지 않을 경우에도 동일한 성능을 낼 수 있는 패스 셀렉터를 제안한다.

• The Transactions of the Korean Institute of Electrical Engineers B
• /
• v.50 no.1
• /
• pp.30-36
• /
• 2001

This paper introduces a new indirect rotor position estimation algorithm for the SRM sensorless control, based on the magnetizing curves of aligned and unaligned rotor positions. Through the basic test method, the complete SRM magnetizing characterization is first constructed using a neural network training, and then used to estimate the rotor position. And also, the optimal phase is selected by the phase selector. In order to verify this approach, the proposed rotor position estimation algorithm using a neural network learning data is investigated. The experimental results show that the proposed control algorithm can be effectively applied to SRM sensorless control.

• Bulletin of the Korean Chemical Society
• /
• v.31 no.1
• /
• pp.82-86
• /
• 2010

Quinine (QN) is a weak anion-exchange type chiral selector and QN-based silica stationary phases have been widely used for enantioseparation of acidic chiral analytes in HPLC and recently in CEC. In this work we report enantioseparation of non-acidic chiral analytes on a quinine carbamate-immobilized zirconia (QNZ) in reversed-phase (RP) CEC. Influences of pH, composition of the buffer, acetonitrile content and the applied voltage on enantioseparation were examined. Enantiomers of the analytes investigated are well separated in acetonitrile/phosphate buffer mobile phases. Separation data on QNZ were compared to those on QN-bonded silica (QNS). Retention was longer but better enantioselectivity and resolution were obtained on QNZ than QNS.

• JSTS:Journal of Semiconductor Technology and Science
• /
• v.16 no.4
• /
• pp.520-527
• /
• 2016

A new dual-loop digital delay-locked loop (DLL) using a hybrid (binary + sequential) search algorithm is presented to achieve both wide-range operation and high delay resolution. A new phase-interpolation range selector (PIRS) and a variable successive approximation register (VSAR) algorithm are adopted to resolve the boundary switching and harmonic locking problems of conventional digital DLLs. The proposed digital DLL, implemented in a $0.18-{\mu}m$ CMOS process, occupies an active area of $0.19mm^2$ and operates over a wide frequency range of 0.15-1.5 GHz. The DLL dissipates a power of 11.3 mW from a 1.8 V supply at 1 GHz. The measured peak-to-peak output clock jitter is 24 ps (effective pk-pk jitter = 16.5 ps) with an input clock jitter of 7.5 ps at 1.5 GHz. The delay resolution is only 2.2 ps.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.18 no.1
• /
• pp.116-121
• /
• 2008

This paper introduces a selection operator which utilized similarity and fitness of individuals based on fuzzy inference. Adding similarity feature to fitness, proposed selector obtained the decrease of premature convergence and better performances than other selectors. Moreover, an adoption of steady-state evolution provided enhancement of performances additionally. Experiments of proposed method for deceptive problems were tested and showed better performances than conventional methods.

• Journal of Institute of Control, Robotics and Systems
• /
• v.12 no.6
• /
• pp.554-560
• /
• 2006

In this paper, we propose the topological map building method about unknown environment using the ultrasonic sensors. An ultrasonic sensor inherently has the range error due to the specular reflection. To decrease this error, we estimate the obstacle states(position and velocity) using the local minimum sensor values and Jacobian. Estimated states are used to avoid the obstacles and build the topological map similar to the type that human being memorizes an environment. When a mobile robot is faced with three problems(comer way, cross way and dead end), it senses the movable directions using FIS(Fuzzy Inference System). Among these directions, it can select the target direction using binary decision tree(Turn Side Selector). Proposed algorithm has been verified with three simulations and three implementations.

• Journal of the Institute of Electronics Engineers of Korea TE
• /
• v.39 no.2
• /
• pp.1-5
• /
• 2002

Floating point unit system follows IEEE 754 Standard. In this paper, we used 1's complement system instead of 2's complement to practice the arithmetic. By converting we enable this system to compute simply and fast. To improve the speed of newly design adder, we used a transformation Carry selector adder of 53 bits. In paper, a design of floating point unit high efficiency micro processor system about for high speed.