• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.3127-3129
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• 2000

본 논문에서는 광 다이오드에서 들어오는 신호로부터 원하는 대역의 신호를 얻기 위한 적외선 수신 IC에 적합한 대역통과필터를 설계하였다 설계한 대역통과필터는 2차 Biquad gm-C 필터의 구조를 이용하여 중심주파수가 38kHz. Quality factor가 10인 필터를 구현하였다. 구현된 대역통과필터는 필터부분과 중심주파수를 보정해 주는 frequency tuning 부분으로 구성되어 있다. 낮은 transconductance와 높은 선형성을 요구하는 transconductor의 설계를 위해 Gilbert 곱셈기 특성을 이용하여 구현하였고 AMS사의 0.8${\mu}m$ BiCMOS model을 사용하여 +5V로 동작되도록 설계 하였다

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.106-107
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• 2014

본 논문에서는 장거리/정밀 이송장치의 추진시스템 동작을 위한 새로운 구조의 영구자석선형동기전동기 및 제어 알고리즘을 제안한다. 제안하는 선형전동기의 이동자는 영구자석을 사용하였으며, 고정자는 각각 독립된 구조를 갖는 집중권선 방식의 코일로 구성되어 있다. 다수의 독립적인 코일 구동을 위하여 아날로그 전류증폭기를 사용하여 전류제어기를 제작하였다. 또한 성능파악을 위해 영구자석선형동기전동기의 축소형 프로토 타입을 제작하였고 실험결과를 통해 제안된 영구자석선형동기전동기의 장거리/정밀 이송장치로서의 적합성을 증명하였다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2009.04a
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• pp.129-138
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• 2009

화재발생시 가장 주요한 사망원인인 유독가스의 제어와, 소방관의 소화활동을 돕기 위한 제연설비는 각 구성품이 유기적으로 동작하는 시스템을 이루기 때문에 전체의 조화도 중요하지만, 기본적으로 각 설비요소가 제 기능을 발휘할 때 전체 시스템의 제연성능을 확보할 수 있게 된다. 그러나 현재 법으로 규정된 국내기준은 주요 구성품별 성능을 제대로 평가할 수 있는 방법 및 기준이 없어 본 연구를 통하여 배연창의 성능평가기술을 개발하고 항목별 성능시험을 실시하여 평가방법의 적합성을 검토하고 국가표준을 만들기 위한 기초 자료로 제공하고자 한다.

• Journal of KIISE
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• v.44 no.9
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• pp.887-892
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• 2017

Brain-computer interface (BCI) is a technology that controls computer and transmits intention by measuring and analyzing electroencephalogram (EEG) signals generated in multi-channel during mental work. At this time, optimal EEG channel selection is necessary not only for convenience and speed of BCI but also for improvement in accuracy. The optimal channel is obtained by removing duplicate(redundant) channels or noisy channels. This paper propose a dual filter-based channel selection method to select the optimal EEG channel. The proposed method first removes duplicate channels using Spearman's rank correlation to eliminate redundancy between channels. Then, using F score, the relevance between channels and class labels is obtained, and only the top m channels are then selected. The proposed method can provide good classification accuracy by using features obtained from channels that are associated with class labels and have no duplicates. The proposed channel selection method greatly reduces the number of channels required while improving the average classification accuracy.

• The Transactions of the Korea Information Processing Society
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• v.1 no.4
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• pp.469-478
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• 1994

In this paper, a high speed, high resolution information processing digital- analog converter was designed for high definition color graphic, digital image signal processing, HDTV. For high speed operation, matrix type current cell array, latch which is not use pipelined, and two dimensional structure decoder using transmission gate were designed. It is adopted to fast-conversion, low-power implementation and exhibited high performance at linearity and accuracy. To reduce silicon area and to maintain resolution, current cell array composed of weighted and non-weighted current cells. In this paper, deglitching current cell design for high accuracy, new switching algorithm assert to reduce switching error. It's This circuit dissipates 130W with a 5-V power supply, and operate above 100MHz with 10 bit resolution.

• KIPS Transactions on Software and Data Engineering
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• v.8 no.1
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• pp.45-50
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• 2019

With the gradual advancement of IT, passive work processes are automated and the overall quality of life has greatly improved. This is made possible by the formation of an organic topology between a wide variety of real-life smart devices. To serve these diverse smart devices, businesses or users are using the cloud. The services in the cloud are divided into Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS). SaaS runs on PaaS, and PaaS runs on IaaS. Since IaaS is the basis of all services, an algorithm is required to operate virtualization resources efficiently. Among them, desktop resource virtualization is used for resource high availability of unused state time of existing desktop PC. Clustering of hierarchical structures is important for high availability of these resources. In addition, it is very important to select a suitable algorithm because many clustering algorithms are mainly used depending on the distribution ratio and environment of the desktop PC. If various attempts are made to find an algorithm suitable for desktop resource virtualization in an operating environment, a great deal of power, time, and manpower will be incurred. Therefore, this paper proposes a resource clustering simulator for cluster selection of desktop virtualization. This provides a clustering simulation to properly select clustering algorithms and apply elements in different environments of desktop PCs.

• Journal of KIISE:Information Networking
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• v.33 no.5
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• pp.380-394
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• 2006

Traditional Internet services provide the same level of qualify to all users without considering about their application's QoS (quality of service) requirements. Because the wireless and Internet technologies are evolving rapidly, the powerful mobile devices are more widely used. Therefore, the new applications such as DMB (digital multimedia broadcasting), VoD (video on demand), telemedicine, and etc. demand appropriate QoS and host mobility. To satisfy free mobility and QoS, we deploy Diffserv (differentiated services) model to the mobile IPv6 networks. We propose the operational procedures and cost analyzing models for providing an MN's mobility and QoS. Also its performance is presented by cost analyzing and the future works are described.

• Fashion & Textile Research Journal
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• v.18 no.3
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• pp.338-350
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• 2016

The purpose of this study is to analyze joint angle for a range of swing motion derived through 3D motion analysis in order to design the ergonomic golf wear, use it for evaluation method of apparel fit to improve exercise functionality and provide the basic materials necessary for designing clothes. In order to do this, the subjects for this study were 3 men of age 20s. The data for a range of motion of golf swing were collected by using equipment for 3D motion analysis and then were used for analysis of joint angles and evaluation method of apparel fit. Range of motion was derived through 3D motion analysis of golf swing motion and joint angles for items of joint motion item and of X, Y, and Z-axis were calculated, respectively. In order to set the evaluation questions for evaluation of apparel fit, to find a range of motion at the maximal value and the minimal value of swing motion. As a result, during the swinging motion, neck extension, right shoulder extension, right/left elbow extension, right/left elbow supination did not appear. Items of joint motion showing the maximum at range of each swing motion were applied into 55 questions and consisted. The results of this study were meaningful as a basic study to apply 3D motion analysis to the fashion industry. It's expected to be used to design functional clothing.

• Journal of IKEEE
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• v.18 no.4
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• pp.572-580
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• 2014

This study deals with reconfigurable modular robot with respect to the compact and capability of representing the various actions for promoting creativity through education and play. Generally modular robot can be designed as a suitable robot that is transformed to various structure by reconstructing each cells, However, there are only few research on the education and play using those robots in the world and still nothing domestically. Unlike the existing modular robots only having a repeating motion, the proposed modular works by individual module such as sound is produced by sound module, wheel is driven by wheel module, LED module controls the visual expression, power is supplied by battery module, bluetooth module for communication, and dynamic motion realization is possible by using joint module. By manipulating the abilities endowed by individual modules, diversity of creative activities is possible and thus made an easy access for children. This study deals with the design of modular robotic by using the variety of different modules to endowed the learning and playing ability. And the study showed the utility of the operating behavior over the actual production and testing.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.871-874
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• 2003

본 논문은 LDAP 클라이언트와 서버사이에서의 상호운용성 시험을 위한 시험도구 구현에 대한 것이다. 여러 벤더에 의해 구현된 LDAP 제품들을 업무에 적응하기 위해서는 상호간의 접속 운용이 가능한지를 시험하기 위한 것으로 표준적합성 시험과 함께 상호운용성 시험이 선행 되어야 한다. 이러한 시험을 위한 시험도구로 이미 구현된 것이 있으나, 이들은 OS 에 따른 설치 시 제약조건이 많으며, 시험 실행방법의 어려움과, 시험 시 시험항목 및 LDAP 서버에 저장된 데이터가 한정되어 불편한 점이 있다. 이를 보완하기 위해 BLITS를 기반으로 한 OS의 제약이 적고, 사용자가 시험 항목을 수정 가능한 시험도구를 구현하였다. 구현한 시험도구의 타당성 검증을 위해 두 개의 LDAP 서버를 대상으로 하여 실제 상호운용성 시험을 수행 하였다. 시험 결과 203.241.249.185 의 주소를 가지는 서버는 선정된 시험항목과 사용자가 정의한 시험에 대해 모두 정상적인 시험결과를 출력하였으며 www.openldap.com 주소를 가지는 서버는 관리자 권한이 필요치 않은 항목에 대해서는 정상적인 시험결과를 출력하여 구현한 시험도구가 정상적으로 동작함을 확인하였다.