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ISO/IEC 15444-1 JPEG2001 표준을 지원하는 Context 기반 압축기인 MQ coder의 설계
이민우,김주현,강봉순 東亞大學校附設 情報技術硏究所 2005 情報技術硏究所論文誌 Vol.13 No.1
JPEG2000 use DWT(Discrete Wavelet Transform). DWT coefficient can compress by using Adaptive Bit_plane coder and MQ coder. In this paper we design the hardware architecture of MQ coder. It is based on bit_plane coder's context and decision value. JBIG2 also use MQ coder for image compression. Designed MQ coder is compatible with the JPEG2000 and JBIG2 standards.
주봉덕,유철재,이헌영 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.1
Biliary ascariasis results not only in biliary tract disease, but also in secondary stone formation, hemorrhage into biliaty tract, acute cholecystitis, biliary perforation, invasion to pancreatic duct, pancreatitis, he%atitis, and liver abscess. In recent, we experienced a case of biliary ascariasis with concomitant biliary stones, which was identified by ultrasonogram percutaneous transhepatic cholangiography, and computed tomography, thereby reporting it herein with a review of literatures.
유연성을 갖는 분산 해쉬 테이블 기반의 피어 투 피어 인터넷 텔레포니 서비스의 구현
이주호,김재봉,정충교 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
Internet telephony provides voice communication services with added flexibility for multimedia extension at a lower cost compared to traditional telephone systems. We implemented an internet telephony system as an overlay network without a centralized server, using a distributed hash table (DHT). Compared to the current server-based internet telephony system, our system is fault-tolerant, scalable, and can be flexible extended to various services and advanced to integrated service. To demonstrate the high flexibility of our DHT-based internet telephony system, we made our system cooperate with web servers. Web users can check up others online states and establish voice communication sessions to online users at a mouse click. This technology can be tipplied to more complex services such as multimedia messaging or video conference service.
디지털 설계에 적합하도록 수정된 Anti-cloche 필터를 가진 디지털 SECAM encoder의 설계
이민우,김주현,강봉순 東亞大學校附設情報技術硏究所 2005 情報技術硏究所論文誌 Vol.12 No.2
This paper presents a new design method of Sequentiel Couleur Avec Memoire (SECAM) which is one of the normal broadcasting standards. The analog SECAM encoder is difficult to make a digital hardware because of a characteristic of Anti-cloche filter, pre-emphasis filter and FM modulation. So this paper proposes the modified filter and the rearranged FM modulation method for digital SECAM encoder. The proposed method makes it possible that the SECAM encoder can be implemented by a digital system like as National Television Standards Committee (NTSC) and Phase-Alternate Line (PAL).
지상파 디지털 멀티미디어 방송 시스템을 위한 파이프라인 구조의 IFFT/FFT 모듈
이창훈,하주영,강봉순 東亞大學校附設 情報技術硏究所 2004 情報技術硏究所論文誌 Vol.12 No.1
In this paper, we propose an implementation result for Multi complex point pipelined IFFT/FFT(Inverse Fast Fourier Transform/Fast Fourier Transform) in terms of sequential data processing. We compared four types of IFFT/FFT modules for the hardware complexity and operation for IEEE 802.11a-1999. In order to minimize the error, we design the IFFT/FFT module to operate with additional decimal parts after butterfly operation. In case of the R22SDF(Radix-2 Single-path Delay Feedback), the IFFT/FFT module has low gate counts excluding RAMs and the minimized error rate as compared with other types. Therefore we choose the pipelined R22SDF architecture IFFT/FFT for DAB(Digital Audio Broadcasting) System.
ITU-R BT.470 표준을 만족하는 수정된 디지털 Video encoder의 설계
이민우,김주현,강봉순 東亞大學校附設情報技術硏究所 2005 情報技術硏究所論文誌 Vol.12 No.2
In this paper, we propose a modified design method of multiple standards video encoder which is supporting the National Television Standards Committee (NTSC), Phase-Alternate Line (PAL) and Sequentiel Couleur Avec Memoire (SECAM) broadcasting standards. The proposed encoder can make various broadcasting standard signals, such as NTSC, PAL and SECAM by using the appropriate sub-carrier and bandwidth. Also, in order to separate broadcasting signal into the luminance signal and chrominance signal, the proposed video encoder has Discrete Time Oscillator (DTO) and Low Pass Filter (LPF). So the signal processes with same function can be shared. According to the above state, we expect that the proposed video encoder could increase the hardware efficiency by using the improved method. Moreover, the proposed encoder uses a modified anti-cloche filter and SECAM data flow for applying the SECAM encoding algorithm to digital processing system. So, the proposed encoder can support the NTSC, PAL and SECAM which are using QAM modulation and FM modulation, respectively.
이민규,이두성,윤경일,김주봉 濟州大學校工科大學附屬産業技術硏究所 1992 尖端技術硏究所論文集 Vol.3 No.-
This study is to investigate the characteristics of products on mixing ratio of raw materials for scoria tile manufacturing. The water absoprtion of scoria tile decreased as scoria particle size decreased and a ratio of scoria/sand increased. And also thee water absoprtion of tile decreased as an amount of cement decreased. Smaller scoria particle size, smaller ratio of scoria and sand, and larger amount of cement enhanced strength and thermal conductivity of scoria tile. The surface pattern of scoria tile became various figures as a ratio of scoria and sand increased. Well mixing of large and small particles made surface pattern of tile diverse.
이봉섭,주재현 三陟大學校 産業科學技術硏究院 2005 産業科學技術硏究論文集 Vol.10 No.-
If obstacle in power supply, its affects are great are on the community and it is consequently demanded lots of difficulties to recover and repair. Accordingly, diagnosis techniques, that are able to prevent from accidents before they happen by providing more stable and highly reliable power effectively and finding sign of the accidents, is very, important. A novel Ultra Wide Band microstrip-fed circular patch antenna i presented. The measured impedance bandwidth of the proposed antenna is from 0.5[GHz] to 2.5[GHz] with the stop band from 0.5[GHz] to 1.7[GHz] for VSWR<2. Form results of this study, The antenna is will play an important role for the sensor for insulation diagnosis system by UHF method of real site GIS and power equipment using SF_(6) gas.
이희민,김재현,이봉주,하태규,김흥곤,윤기중 圓光大學校 醫科學硏究所 1996 圓光醫科學 Vol.12 No.1
Mature cystic teratomas comprise 10% of all ovarian tumors and show the highest frequency of incidence in women under 20 years of age. Torsion of ovarian cyst is the most common complication in young female and lower abdominal pain, peritonitis, necrosis and shock are outcomes that require emergency treatment. Generally, gross finding of mature cystic teratoma shows that most of the entire ovary is replaced by multiple cystic masses, and rarely only small portion of the ovary is changed into cystic mass. We report a case of torsion of mature cystic teratoma in an 11 year old girl with a brief review of literature.