• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.213-214
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• 2008

이종망 핸드오버시 동종망 핸드오버를 저해하지 않고 시행하는 방안을 제안하였다. 해당 방법은 동종망의 인접기지국을 이용한 임계조건만을 적용하는 것으로 불필요한 핸드오버가 발생하는 경우를 제한하여 저전력 구동 기반으로 동작하기 적합하며 핸드오버 정책 등에서 적용할 수 있도록 기준 성능을 조건으로 이용하는 핸드오버를 제공할 수 있다. 해당방법의 적용으로 무선망의 경계지역을 구분하는 핸드오버 제공이 가능하고 잦은 핸드오버 발생을 억제하는 신뢰성 있는 서비스 품질을 기대할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.253-255
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• 2004

현재의 센서 네트워크를 구성하고 있는 센서 노드들은 배치 전에 미리 입력된 라우팅 및 감지 서비스만을 제공한다. 이러한 센서 네트워크 및 노드 구조는 기존의 고정화된 환경에는 적합하나 차세대 유비쿼터스 환경과 같이 시스템이 스스로 성장하며 서비스 추가 및 재설정 요구가 빈번하게 일어나는 환경에서는 그대로 적용하기가 힘들다. 따라서 본 논문에서는 유비쿼터스 환경에서 시스템 레벨의 정책 및 환경 변화에 따라 적응적으로 동작할 수 있는 센서 네트워크 노드 구조를 제안하여, 또한 제안된 구조에서 기존의 구조에 대한 에너지 소모 정도를 분석하여 제안의 현실성을 검증한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.319-321
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• 2003

인터럽트는 시스템의 내.외부의 프로그램 또는 장치에 의해 발생하는 신호로서 운영체제가 하던 일을 멈추고 인터럽트 서비스 루틴(Interrupt Service Routine)을 통해 적합한 동작을 수행하도록 한다. 실시간 시스템을 포함한 대부분의 컴퓨팅 시스템에서 인터럽트의 발생 빈도와 인터럽트 서비스 루틴의 수행시간에 따라 Response Time이 길어질 수 있는데 이는 시스템에 커다란 오버헤드가 된다. 본 논문에서는 실시간 운영체제에서 Response Time을 줄이고 효율적으로 인터럽트를 서비스하기 위한 인터럽트 서비스 프로세스의 구현에 대해 기술한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1998.06a
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• pp.43-46
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• 1998

MPEG-2 비디오 표준에서는 좀 더 고품위의 화질을 유지하기 위해 많은 변수들을 조절할 수 있도록 한다. MPEG-2의 header를 통해 전송되는 이러한 변수들이 MPEG 비디오 디코더에서 올바로 해석되어야 전송한 영상 신호와 동일한 신호를 수신자가 볼 수 있을 것이다. 본 논문에서는 MPEG 비디오 디코더의 정상 동작을 검사할 디코더만을 이용해 확인할 수 있도록 제작한 검사용 비트열을 소개한다. 또 공개되어 있는 검사용 비트열의 특성과 제작한 비트열의 검사방식을 software 디코더의 결과로 비교 분석한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.824-827
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• 2008

차량 내 유선 AV 시스템의 무선화 과정에서 필요한 시스템의 동작을 명세하고, 설계하며, AV 스트림의 동기화 방법을 연구하여 이를 시스템에 적용한다. 또한 차량 무선 AV 네트워크로써 IEEE 802.11n 표준을 사용하고, 그 적합성 여부를 확인하기 위해 설계한 시스템의 요구 대역폭을 분석한다. 이밖에 향후 추진과제에 대해 언급함으로써 본 연구의 전체적인 작업 흐름과 의의에 대해 언급한다.

• 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 Internet of Things and Convergence
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• v.2 no.2
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• pp.1-6
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• 2016

Recently, various types of wearable computers have been studied. In this paper, we analyze the characteristics of head motion information for the operation of the motion classifier produced motion headset that the user can use while listening to music. The prototype receives music from smart phone over bluetooth communications, and transmits the motion information measured by the acceleration sensor to the smart phone. And the smartphone classifies the motion of the head through a motion classifier. we implemented a prototype for our experiment. The user's head motion "up", "down", "left" and "right" were classified using a Bayesian classifier. As a result, in case of the movement of the head "up" and "down", there are a large changes in the x, z-axis values. In future we have a plan to perform a user study to find suitable variables for creating motion classifier.

• Journal of the Korean Society of Clothing and Textiles
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• v.34 no.3
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• pp.480-491
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• 2010

This study investigates the body satisfaction and fitness apparel depending on age and silhouette. The subjects were 254 females 20~50 years of age living in Chungju South Korea. There are various body types in women over the age of 35, the lower part of the body-development type, regular type, the upper part of the body-development type, and the rectangular body type. In addition, there is a lower satisfaction level in circumferences related with apparel fit, especially in the sleeve length, armhole, and crotch length. Therefore, a size system is needed that considers various body types in ready-to-wear clothing for middle-aged women. Design, color, and pattern are most important in clothing purchases by unmarried women, but the ease of laundry management and price discounts are the most significant for clothing purchases by married women. The upper part of the body-development type is unsatisfactory in the size-fit of sleeve length and shoulder width, but the lower part of the body-development type is unsatisfactory in the circumference of the waist, hip, abdominal, girth of skirt, and crotch length. The rectangular body type and the lower part of the body-development type are unsatisfactory in movement comfort, especially in hip girth and crotch length. The upper part of the body-development type is unsatisfactory in the movement comfort of the chest and elbow girth.

• The Transactions of the Korea Information Processing Society
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• v.4 no.11
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• pp.2832-2839
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• 1997

In this paper, a testing architecture and procedure that an idle ATM virtual channel can be utilized for TCP channel is proposed. Four kinds or methodologies for protocol conformance testing have been standardized in ISO. Remote testing method used popularly have some disadvantages that developer must operate system manually in case of System Under Test (SUT) active testing and we cannot control and observe Implementation Under Test (IUT) often. It is proper to adopt distribute testing method than remote test in order to maximize test coverage and optimize fault coverage for conformance testing in ATM systems, and it is required that TCP channel is prepared for distribute testing method. The proposed architecture can adopt distributed testing method without extra physical channel for testing control. Also we can maximize the test coverage and implement the automation of testing without intervention of operator sustaining normal operation of ATM equipment.

• Journal of the Korea Society for Simulation
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• v.16 no.1
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• pp.31-37
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• 2007

The importance of NPC's role in computer games is increasing. An NPC must perform its tasks by perceiving obstacles and other characters and by moving through them. It has been proposed to plan a natural-looking path against fixed obstacles by using a generalized visibility graph. In this paper we develop the execution module for an NPC to move efficiently along the path planned on the generalized visibility graph. The planned path consists of line segments and arc segments, so we define steering behaviors such as linear behaviors, circular behaviors, and an arriving behavior for NPC's movements to be realistic and utilize them during execution. The execution module also includes the collision detection capability to be able to detect dynamic obstacles and uses a decision tree to react differently according to the detected obstacles. The execution module is tested through the simulation based on the example scenario in which an NPC interferes the other moving NPC.