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임베디드 시스템의 영상압축을 위한 분할정렬 알고리즘의 개선
김진만,주동현,김두영,Kim, Jin-Man,Ju, Dong-Hyun,Kim, Doo-Young 한국융합신호처리학회 2005 융합신호처리학회 논문지 (JISPS) Vol.6 No.3
멀티미디어 사용의 증가에 따라 정보화 사회에 있어 정지영상 정보를 높은 압축율로 방대한 데이터를 얼마나 빠르게 에러 없이 전송 또는 처리하는가 하는 문제가 요구되어지고 있다. 본 논문은 임베디드 시스템 환경의 정지영상 인코팅 분야에서 다양한 기능과 압축 성능을 보이고 있는 JPEG2000의 압축효율 향상을 위하여 양자화 전 단계에서 추출데이터를 축소시켜 EBCOT 단계로 전달되는 데이터의 양을 줄이는 방법으로, 웨이블렛 계수의 저주파 대역에 대한 부호화를 제거하여 부호화 과정에서의 sign bit를 줄이고, 중요도 판별과정에서 각 단계별 임계치를 설정하여 중복비트를 제거하는 분할 정렬 알고리즘을 이용하여 웨이블렛 계수를 줄이는 방법을 제안하였다. 실험결과, 제안한 방법을 통해 임베디드 환경아래에서 기존의 JPEG2000 표준보다 더 우수한 양질의 성능과 저 비트율을 확인할 수 있었다. With the increasing use of multimedia technologies, image compression requires higher performance as well as new functionality in the informationized society. Specially, in the specific area of still image encoding in embedded system, a new standard, JPEG2000 that improve various problem of JPEG was developed. This paper proposed a method that reduce quantity of data delivered in EBCOT(Embedded Block Coding with Optimized Truncation) process using SPIHT(Set Partitioning in Hierarchical Trees) Algorithm to optimize selection of threshold from feature of wavelet transform coefficients and to remove sign bit in LL area for the increment of compression efficiency on JPEG2000. The experimental results showed the proposed algorithm achieves more improved bit rate in embedded system.
정종현,서보순,주동진,박만철,손병현,피영규,Jung, Jong-Hyeon,Seo, Bo-Sun,Ju, Dong-Jin,Park, Man-Chul,Shon, Byung-Hyun,Phee, Young-Gyu 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.6
The purpose of this study was to investigate the concentration of indoor air pollutants at 63 elementary schools, 41 middle schools and 51 high schools in Ulsan from the beginning of May to the end of December, 2008. To assess the indoor air quality of the various classrooms, the 8 indoor air pollutants such as $CO_2$, CO, $NO_2$, $O_3$, $PM_{10}$, TVOCs, HCHO and TBC were measured and analyzed. The mean concentrations of $PM_{10}$ and TBC in the elementary schools were significantly higher than those of middle and high schools (p < 0.01). For the HCHO, the multi-use practice rooms showed an average 1.5 times higher than general classrooms. In schools located in urban areas, the concentrations of CO, $O_3$, $PM_{10}$, HCHO and TBC were lower than in the vicinity of industrial complexes. The exceeding rate of the school air quality maintenance limits in the 6 air pollutants by law were 6.7%, 3.5%, 1.7%, 18.2%, 13.0% and 18.4% for $CO_2$, $NO_2$, $O_3$, $PM_{10}$, HCHO and TBC, respectively. Based on these results $PM_{10}$ and TBC have to be in the order of priority of need to improve the classroom air quality in elementary school of Ulsan.
이주동(Ju Dong Lee),이만식(Man Sig Lee),김영석(Young Seok Kim) 한국에너지기후변화학회 2008 에너지기후변화학회지 Vol.3 No.1
Structure H formation experiments were conducted in a semi-batch stirred vessel using methane as the small guest substance and neohexane(NH), tert-butylmethylether (TBME) and methylcyclohexane(MCH) as the large molecule guest substance (LMGS). The results indicate that the rates of gas uptake and induction times are generally dependent on the magnitude of the driving force. When tert-butyl methyl ether is used as the LMGS rapid hydrate formation, much smaller induction time and rapid decomposition can be achieved. Liquid-liquid equilibrium (LLE) data for the above LMGS with water have been measured under atmospheric pressure at 275.5, 283.15, and 298.15 K. It was found that TBME is the most water soluble followed by NH and MCH. The solubility of water in the non-aqueous liquid was found to increase in the following order: MCH < NH < TBME.
가스하이드레이트 구조 변형을 통한 메탄 저장에 관한 연구
이주동(Lee, Ju-Dong),이만식(Lee, Man-Sig),김영석(Kim, Young-Seok) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
Structure H formation experiments were conducted in a semi-batch stirred vessel using methane as the small guest substance and neohexane(NH), tert-butylmethylether(TBME) and methylcyclohexane(MCH) as the large molecule guest substance (LMGS). The results indicate that the rates of gas uptake and induction times are generally dependent on the magnitude of the driving force. When tert-butyl methyl ether is used as the LMGS rapid hydrate formation, much smaller induct ion time and rapid decomposition can be achieved. Liquid-liquid equilibrium (LLE) data for the above LMGS with water have been measured under atmospheric pressure at 275.5, 283.15K, and 298.15K. It was found that TBME is the most water soluble followed by NM and MCH. The solubility of water in the non-aqueous liquid was found to increase in the following order: MCH<NH<TBME.
이주동(Lee, Ju-Dong),이만식(Lee, Man-Sig),김영석(Kim, Young-Seok),송명호(Song, Myung-Ho) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
Growth characteristics of methane-propane clathrate hydrate, growing under different undercooling conditions, was investigated. After the water within pressurized vessel was fully saturated with guest gas molecules by agitation, medium was rapidly undercooled and maintained at the constant temperature. The growth of hydrate was always Initiated with film formations at the upper bounding surface of liquid pool. The visual observation using microscope revealed detailed features of subsequent crystal nucleation, migration, growth and interference occurring within liquid pool. A number of small crystals ascended and settled at the hydrate film. When undercooling was small ({Delta}T=3.2K), some of the settled crystals slowly grew into faceted columns. As the undercooling increased, the downward growth of crystals underneath the hydrate film became dendritic and occurred with greater rate and with finer arm spacing. The shapes of the floating crystals were diverse and included octahedron and triangular or hexagonal platelet When the undercooling was small, the octahedral crystals were found dominant. As the undercooling increased, the shape of the floating crystals also became dendritic. The detailed characteristics of floating crystals were reported in this study.