• 한국통신학회논문지
• /
• 제30권1A호
• /
• pp.10-27
• /
• 2005

본 논문에서는 다년간에 걸쳐 진행되었던 WCDMA(UMTS) 기지국 모뎀 개발을 위한 상위 레벨 설계 및 설계에 적용된 기저대역 동기 알고리즘에 대한 분석과 고정 소수점 설계를 통한 성능 평가 결과를 제시하였다. 설계 대상 시스템이 기지국임을 고려하여 모뎀을 구성하는 각 동기 모듈은 빠른 추적 성능보다 안정적인 성능을 보장할 수 있도록 설계되었으며, 구현을 위한 고정 소수점 설계시 각 모듈의 내부 연산에 대한 최적의 비트설정을 통하여 복잡도를 최소화하였다. 본 논문에서는 먼저 모뎀 설계를 위하여 개발된 각 기저대역 동기 모듈에 대한 분석을 수행하였으며, 이후 구현을 위하여 고정 소수점 설계된 모뎀과 부호화/다중화를 포함하는 심볼 레벨 프로세싱(Symbol Level Processing; SLP)파의 링크 성능을 제시하였다. 성능 평가는 3GPP TS 25.104(Release 5)에 제시된 12.2kbps, 64kbps, 144kbps, 384kbps의 전송 속도에 대하여 참조 무선 채널 환경을 기반으로 수행되었으며, 규격에 제시된 최소 요구 성능과의 비교를 통하여 약 2dB 이상의 성능 여유(margin)를 갖는 매우 안정적인 동작을 보임을 증명하였다. 본 논문에서 제시된 WCDMA 기지국 모뎀은 기지국 모뎀 칩으로 성공적으로 구현되었다.

• 제어로봇시스템학회논문지
• /
• 제11권8호
• /
• pp.709-716
• /
• 2005

As a way to build more efficient and intelligent container cranes for todays hub ports, communication networks are used to interconnect numerous sensors, actuators, controllers, and operator switches and consoles that are spatially distributed over a crane. Various signals such as sensor values and operator's commands are digitized and broadcast on the network instead of using separate wiring cables. This not only makes the design and manufacturing of a crane more efficient, but also easier implementation of intelligent control algorithms. This paper presents the performance evaluation of CAN(Controller Area Network), TTP(Time Triggered Protocol) and Byteflight that can be used for cranes. Through discrete event simulation, several important quantitative performance factors such as the probability of a transmission failure, average system delay (data latency) and maximum system delay have been evaluated.

• 공학교육연구
• /
• 제14권4호
• /
• pp.88-96
• /
• 2011

This paper aims to develop the learning contents of PBL based program and analyze the result of evaluation questionnaire to examine the students' thoughts concerning the effectiveness of PBL course and their satisfaction. 'Discussion' is one of the representative communicative types, especially requesting both communication competence and teamwork among team members. This study was conducted with 218 junior and senior students taking lectures of ${\ll}$Presentation and Debate Skills${\gg}$ in the college of engineering at Pusan National University. According to the evaluation result, students experienced various effects of PBL such as (1) self-directed learning, (2) cooperative learning, (3) problem solving skills, etc. Students pointed out also as merits of PBL course, (1) knowledge acquisition and information sharing among students, (2) improvement of communicative competence, (3) amelioration of teamwork, (4) progress of the problem solving skills. However, there have been several difficulties and problems during PBL process, implications for ameliorating PBL based were discussed and suggested in detail.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2001년도 하계학술대회 논문집 D
• /
• pp.2774-2776
• /
• 2001

Recently web based lectures in Engineering education are on the increasing. It is required to evaluate student's records on the web. This paper presents web based evaluation system which can evaluate efficiently a stage of understanding in the learning process. The proposed web based evaluation system is designed and implemented using PHP and ORACLE. Lecturers can manage their questions for an examination and learners also can sit for an exam anytime, anywhere, confirm their score in this system. Therefor it provide lecturers and learners with feedback education.

• 대한인간공학회:학술대회논문집
• /
• 대한인간공학회 1998년도 춘계학술대회논문집
• /
• pp.13.1-18
• /
• 1998

IVNS(In-Vehicle Navigation System) which developed by the advance of technological system including computer, display and communication will procide the important interface functions between the driver and the ITS (Intelligent Transport System). However, hat the human factors engineer can actually offer to the designer is by no means a complete set of design specifications. Therefore, a set of boundary conditions and operational ranges within which the designer can be assured that physical, perceptual and cognitive abilities and limitations of drivers will be accommodated system atically[6]. Also, this will be the considerations to compose the IVNS HMI (Human-Machine Interface) design guidelines and IVNS HMI evaluation system. As the first phase of developing the IVNS HMI evaluation system, this paper describe the architecture and the content of this system.

• 한국경영과학회:학술대회논문집
• /
• 대한산업공학회/한국경영과학회 1995년도 춘계공동학술대회논문집; 전남대학교; 28-29 Apr. 1995
• /
• pp.79-90
• /
• 1995

The material handling equipment selection, that is a key task in the material handling system design, is a complex, difficult task, and requires a massive technical knowledge and systematic analysis. It is invaluable to justify the selected equipment model by the performance evaluation before its actual implementation. This paper presents an intelligent knowledge-based expert system called "IMESE" created by authors, for the selection and evaluation of material handling equipment model suitable for movement and storage of materials in a manufacturing facility. The IMESE is consisted of four modules: a knowledge base to select an appropriate equipment type, a multiple criteria decision making procedure to choose the most favorable commercial model of the selected equipment type, a database to store the list of commercial models of equipment types with their specifications, and simulators to evaluate the performance of the equipment model. The whole process of IMESE is executed under VP-Expert expert system environment.vironment.

• 펄프종이기술
• /
• 제32권1호
• /
• pp.94-100
• /
• 2000

This study was carried out to understand the present status of the quality evaluation capability of domestic fine paper industry. Six light weight coated papers and one wood containing printing and writing paper with similar basis weights were produced by seven paper companies and their properties were evaluated at four different testing laboratories of domestic fine paper mills. Paper properties including basis weight , thickness , tensile, tear , brightness , opacity, etc were examined , and the repeat ability and reproducibility of the test results were analyzed. Results showed that repeatability of the measurements within the laboratory was satisfactory . Reproducibility of the measurements between laboratories, however, was not satisfactory. This showed that strict implementation of the standard testing methods and periodic calibration of testing equipments should be made to improve quality evaluation capability of domestic fine paper industry.

• 컴퓨터교육학회논문지
• /
• 제6권3호
• /
• pp.185-195
• /
• 2003

수행평가는 학생을의 학습 과정을 관찰하거나 학생들이 산출해 낸 자료를 통해 평가하는 방식으로 단순 필납 고사의 단점을 보완하는 새로운 평가 방식으로 주목받고 있다. 그러나 이 수행평가를 적용하는데 많은 노력과 시간 부담이 들어 실제 학교 현장에서 시행에 많은 어려움을 겪고 있다. 이러한 부담을 줄이기 위해 인터넷을 이용한 평가가 다방면에서 시도되고 있으나, 이들 기존 연구에서는 학생의 평가 참여가 허용되지 못하여 평가 방법이 다양하지 못하거나 교사의 피드백이 부분적으로만 사용되는 문제점을 가지고 있다. 따라서 본 논문에서는 학습자들의 평가 참여 및 학습 과정 중의 다양한 수행평가를 지원하고 교사가 효과적으로 관리할 수 있는 웹 기반의 수행평가 시스템을 설계하고 구현하였다. 이러한 웹 기반 수행평가 시스템을 활용할 경우, 학생들의 평가력 등의 고등사고 능력과 전인적 발달을 도모하고, 수행평가를 위한 교사의 업무와 시간 부담을 대폭 줄일 수 있을 것이다.

• 방송공학회논문지
• /
• 제16권6호
• /
• pp.1018-1025
• /
• 2011

H.264/AVC의 스케일러블확장 표준인 SVC(Scalable Video Coding)는 하나의 비트스트림으로 다양한 공간, 시간, 화질 계층의 비디오를 제공할 수 있는 컨버전스용 코덱이다. 최근, 감시 비디오, 모바일 방송 등에 활용하기 위한 실시간 SVC 코덱 개발이 진행되고 있다. 본 논문은 임베디드 DSP 기반의 H.264/SVC 복호기의 설계 및 구현을 기술한다. 본 연구에서는 PC 환경에서 실시간 최적화된 OSD(Open SVC Decoder)의 구조와 복잡도를 분석하고, 이를 이용하여 TI사의 Davinci EVM(Evaluation Module) 보드에 실시간 SVC 복호기를 구현하였다. 구현된 H.264/SVC 복호기는 QCIF, CIF급 해상도는 50Hz 이상, SD는 15Hz까지 실시간으로 복호화할 수 있음을 확인하였다.

• 경영과학
• /
• 제12권1호
• /
• pp.35-50
• /
• 1995

The material handling equipment selection, that is a key task in the material handling system design, is a complex, difficult task, and requires a massive technical knowledge and systematic analysis. It is also invaluable to justify the selected equipment model by the performance evaluation before its actual implementation. This paper presents an intelligent knowledge-based expert system called "IMESE" created by author, for the selection and evaluation of material handling equipment model suitable for movement and storage of materials in a manufacturing facility. The IMESE was constructed by using the tools of VP-Expert expert system shell, DBASEIII plus, FORTRAN 77, and SLAMII simulation language. The whole process of IMESE is executed under VP-Expert expert system environment.vironment.