• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.6 no.3
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• pp.135-140
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• 2013

In this paper, novel PWM generation method for cascaded H-bridge PWM converter is proposed. The proposed method can solve the unvalancing problem between H-bridges which consist cascade PWM converter without any injection of redundancy switching pattern for solving the load of switches forced from voltage reference of controller.

• Proceedings of the KIEE Conference
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• 1999.07b
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• pp.773-775
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• 1999

In this paper, A new approach to stable adaptive fuzzy control of systems is proposed. The proposed scheme does not require an accurate mathematical model yet it guarantees an asymptotic stability. Fuzzy logic system, which has the property of universal approximator is used as an adaptive element of the proposed controller. Also this Paper proposes a fuzzy system that estimates the maximum limit of the uncertain term in the system dynamics to guarantee the Lyapunov stability. Proposed adaptive fuzzy control is applied to the DC servo motor system in order to show its good performance.

• Electronics and Telecommunications Trends
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• v.16 no.1 s.67
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• pp.1-9
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• 2001

오늘날 이동통신 시대를 맞이하여 사용자에게 Anywhere, Anytime, Anybody, 그리고 Anyplace(4A) 조건을 보장해 주는 3세대인 Universal Mobile Telecommunication System/International Mobile Telecommuni-cation-2000(UMTS/IMT-2000) 비동기 시스템은 기존의 여러 종류의 서비스를 제공하기 위하여 개선된 무선 접속으로 다양한 이동 환경 하에서 여러 가입자에게 다양한 서비스를 제공하는 것을 목표로 하고 있다. 이와 같이 UMTS/IMT-2000 비동기 시스템에서는 저속의 음성에서 2Mbps까지의 전송속도를 가지는 데이터, 영상 등의 멀티미디어 서비스와 이동 가입자에게 전 세계 어디를 가든 통화할 수 있는 국제 로밍 서비스를 제공하여야 한다. 본 고에서는 UMTS/IMT-2000 기반인 Third Generation Project Partnership(3GPP)의 제3세대 이동통신망인 UMTS에 대하여 살펴 본 후 최대 2Mbps급의 트래픽 및 실시간 멀티미디어 응용을 위한 개선된 QoS를 지원하는 UMTS Terrestrial Radio Access Network (UTRAN)의 구조를 기술하였다. 특히, 기지국 및 핵심망과 접속되는 무선망 제어국의 구조, 특성, 그리고 기능에 대하여 논하였다.

• Journal of Mechanical Science and Technology
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• v.17 no.2
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• pp.230-238
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• 2003

In this paper, a three-fingered anthropomorphic robot hand, called SKK Robot Hand 1, is presented. By employing a two-DOF joint mechanism, called Double Active Universal Joint (abbreviated as DAUJ from now on) as its metacarpal joint, the hand makes it possible to mimic humanlike motions. We begin with addressing the motivation of the design and mention how the anthropomorphic feature of a human is realized in the design of SKK Hand I Also, the mechanism of the hand is explained in detail, and advantages in its modular design are discussed. The proposed hand is developed for use as a testbed for dextrous manipulation. It is expected to resolve the increasing demand for robotic applications in unstructured environments. We describe its hardware construction as well as the controller structure including the preliminary results of experiments.

• Proceedings of the IEEK Conference
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• 2000.06e
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• pp.159-162
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• 2000

This paper addresses the design and implementation problem of the mobile robot with the synchronous driving mechanism that consists of modular control systems based on the Universal Serial Bus (USB). Recently, the USB have attracted the hardware developers'interests due to its low cost, compatibility, and extenability. In particular, the USB enables us to organize the whole system in the modular manner very easily, and this property plays a very important role in shortening the developing time in implementing the target system, for example, the mobile robot system. In this paper, we implement the USB motion controller and the USB ultrasonic sensor system and verified the validity and the effectiveness of the proposed system through the real experiments including the mobile robot navigation and the environment recognition.

• Proceedings of the KIPE Conference
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• 2003.11a
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• pp.85-89
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• 2003

Many single-stage PFC(power-facto.-correction) ACHC converters suffer from the high link voltage at high input voltage and light load condition. In this paper, to suppress the link voltage, a novel high power factor high efficiency PFC AC/DC converter is proposed using the single controller which generates two gate signals so that one of them is used far gate signal of the flyback DC/DC converter switch and the other is applied to the Boost PFC stage. A 130w prototype for LCD monitor adapter with universal input $(90-265V_{rms})$ and 19.5V 6.7A output is implemented to verify the operational principles and performances. The experimental results show that the maximum link voltage stress is about 450V at 270Vac input voltage. Moreover, efficiency and power factor are over $84\%$ and 0.95, respectively, under the full load condition.

• Proceedings of the KIPE Conference
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• 2004.11a
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• pp.76-80
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• 2004

This paper describes a load simulator with power-recovery capability, which is based on the voltage source converter-inverter set. The load simulator described in this paper can save the electric energy that should be consumed to test the operation and performance of the distributed generation system and the power quality compensator. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. The load simulator can be widely used in the lab to test the performance of the distributed generation system and the power quality compensator.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.4
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• pp.181-187
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• 2005

This paper describes a load simulator with power-recovery capability, which is based on the voltage source converter-inverter set. The load simulator described in this paper can save the electric energy that should be consumed to test the operation and performance of the distributed generation system and the power quality compensator. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. The load simulator can be widely used in the lab to test the performance of the distributed generation system and the power quality compensator.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10a
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• pp.385-389
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• 2006

본 논문에서는 정보가전기기를 제어하기 위해 ZigBee를 이용한 데이터 기반의 양방향 통합 리모컨의 모델을 제시하고자 한다. 본 논문에서 제시되는 데이터 기반의 양방향 통합 리모컨의 사용자 인터페이스는 물리적으로 고정되어 있지 않고 정보가전기기로부터 얻은 인터페이스 정보를 이용하여 해당 정보가전기기에 알맞은 인터페이스를 유동적으로 사용자에게 제공한다. 따라서 제어할 수 있는 정보가전기기의 제한이 사라지며 사용자가 직감적으로 이해할 수 있는 인터페이스 제공, 다양한 정보가전기기의 제어, 상태 모니터링 등이 가능해진다.

• Journal of KIISE:Software and Applications
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• v.37 no.1
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• pp.19-28
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• 2010

Recently, various home appliances are inter connected in wired/wireless network to provide a single service, but their interfaces are not uniformly integrated. In order to get a service in such an environment, users have to figure out how to control each appliance and the way of combining its functions with others. Even worse to the users, many buttons are barely used to control the complicated functions of the appliances on the remote controllers, and controllers have very similar shapes in each other. In this paper, based on the definitions of a task as a unit of services provided in the environment of multi-connected appliances, we propose a markup language for home appliances, called HAML (Home Appliance Markup Language), for generating task-based user interfaces to help controlling multi-connected appliances as one pleases. The proposed method generates interfaces by gathering the buttons frequently used and necessary for tasks, and provides automatic settings of multi-connected appliances. The proposed method is verified with an analysis of scenarios and usability tests.