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영상신호의 상관관계를 이용한 CORDIC 기반의 DCT 설계
정현욱,김진상,조원경 경희-다반 ASIC 설계교육센터 2002 경희-다반 ASIC센터 논문집 Vol.3 No.-
We propose a novel low-power discrete cosine transform (DCT) architecture based on CORDIC processors. The CORDIC-based DCT algorithm is a good candidate for high performance applications because of its simple arithmetic operation. The proposed algorithm reduces conventional CORDIC-based DCT computation by exploiting the spatial correlation of image data. The proposed architecture can be used for the low-power applications like multimedia portable electronic devices.
조현욱,김명수,정은환,유재휘,윤병주 명지대학교 공학기술연구소 1986 공학기술연구소 논문집 Vol.1 No.-
One of protection methods for computer internal data is to pursue data flow in program and to control its flow. In this thesis, we propose a mechanism which guarantees secure information flow in a program. By investigating security classes of all the variables in a statement and judging necessary condition for secure information flow, proposed model descriminates the program whether it is secure or not. Out model can be implemnted at language translation time, particularly semantic analysis phase, by pursuing security class transfer of each statement.
신현철,윤철호,김종대,정지천,신억섭,허근 한국한의학연구원 1997 한국한의학연구원논문집 Vol.3 No.1
In convulsion state by PTZ in rat, anticonvulsive effect and some γ-aminobutyric acid (GABA)-related mechanisms of Bythus extract in brain was experimented. It was ingibited GABA-T activity, lipid peroxide generation and xanthine oxidase activity as scheduled administration in vitro and vivo. And the content of brain gutathione was increased as scheduled administration in rat. In convulsion state by PTZ of previously managed rat by Buthus extract, onset eime and duration were non-specific changes but recovery time and severity was remarkably reduced. In conclusion speculated that Buthus extract inhibits convulsion by control of GABA content in brain.
외과적 보조의 급속상악확장술 : 치험 5예 REPORT OF 5 CASES
박충열,이용욱,송종운,김영운,박홍주,오희균,유선열,이기현,황현식 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1
Five adults (3 cases of bilateral posterior crossbite, 2 cases of unilateral posterior crossbite) with intermaxillary discrepancy of over 5㎜ due to maxillary transverse deficiency were treated by surgically assisted rapid maxillary expansion (SARME). Bilateral maxillary horizontal osteotomies, osteotomies of pterygomaxillary junction and anterior lateral nasal wall, ans anterior palatal osteotomy were performed in 4 cases, and unilateral osteotomies in 1case, followed by palatal expansion with tooth-borne orthopedic applicance. No significant complication was observed. The mean palatal expansion was 7.2㎜ (5.8∼10.0㎜) in the maxillary first molar region. During the mean follow-up period of 4 years (5 months∼8 years 7 months), no recurrence of crossbite was observed in all cases. The SARME seemed to be a simple, stable, and reliable procedure for achieving a permanent increase of over 5㎜ in skeletal maxillary transverse width of adults.
All-optical image switching in a double-λ system.
Kim, Bongjune,Oh, Cha-Hwan,Sohn, Byoung-uk,Ko, Do-Kyeong,Kim, Hyung Tak,Jung, Changsoo,Oh, Myoung-Kyu,Yu, Nan Ei,Kim, Bok Hyeon,Kang, Hoonsoo Optical Society of America 2013 Optics express Vol.21 No.12
<P>The coherent control of optical images has garnered attention because all information embedded in optical images is expected to be controlled in a parallel way. One of the most important control processes is switch for information delivery. We experimentally demonstrated phase-controlled optical image switching in a double-λ system where the transmission of the image through a medium was switched. Two independent laser sources were adopted for a double-λ system such that images inscribed in two weak probe light beams were incoherent with each other. Arbitrary phase was added to the optical images to show that switching could be accomplished just with the relative phase difference between the probe pixels.</P>
Effect of Organic Additives in Electrolytes for Rechargeable Lithium/Sulfur Battery
Kim, Jin Kyu,Choi, Jae Won,Kim, Yeon Hwa,Kim, Jong Uk,Ahn, Jou Hyeon Trans Tech Publications, Ltd. 2005 Materials science forum Vol.486 No.-
<P>The effect of mixed electrolytes and organic additives on the electrochemical performance of rechargeable lithium/sulfur battery is investigated. The mixture of organic electrolytes, DME, DIG, TEGDME, and DIOX, was prepared to have appropriate composition, and to the electrolyte were added various organic additives, such as toluene, γ-butyrolactone, and MA. They showed an improved cyclic efficiency of lithium/sulfur battery and made utilization of active material, sulfur, more effective.</P>
Robust Image Watermarking Method Using Discrete Cosine Decomposition and Just Noticeable Distortion
Hyeon-Uk Seo,Jae-Sik Sohn,Byoung-Ik Kim,Tae-Gyoun Lee,Seung-Ik Lee,Duk-Gyoo Kim 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
We propose a robust image watermarking algorithm using the just noticeable distortion (JND) and discrete cosine transform (DCT). In DCT, the baseband of the discrete decomposed image has the most energy of the host image, so it has crucial effect on the image quality. The conventional algorithms don"t utilize the characteristics of the DC coefficients which will participate in the watermark embedding. To reduce the drawbacks of the conventional algorithms, the proposed algorithm uses the DC coefficients in the watermark embedding step unlike the conventional algorithms. To improve the imperceptibility of watermarking system, we use JND value as a embedding strength. The results of simulation show that the proposed algorithm is robust to JPEG compression.
Charge/Discharge Characteristics of SnO<sub>2</sub> Electrodes for Lithium Polymer Batteries
Kim, Jong Uk,Kim, Jin Kyu,Choi, Jae Won,Kim, Yeon Hwa,Ahn, Jou Hyeon,Kim, Guk-Tae,Jun, Dae Kyoo,Gu, Hal Bon Trans Tech Publications, Ltd. 2005 Materials science forum Vol.486 No.-
<P>The purpose of this research is to develop tin oxide electrode for lithium ion polymer battery. We have investigated cyclic voltammetry and charge/discharge cycling of SnO2/SPE/Li cells. The first discharge capacity of SnO2 anode was 612mAh/g. The discharge capacity of SnO2 anode was 560 and 376mAh/g at 2nd and 15th cycle at room temperature, respectively. The SnO2 composite anode with PVDF-PC-EC-LiClO4 electrolyte showed good cycling performance.</P>
State Indicator of Water Quality for Surface Water and Groundwater in Agriculture
Kim, Min-Kyeong,Jung, Goo-Bok,Ro, An-Sung,Choi, Seung-Chul,Choi, Won-Il,Kim, Eun-Jeong,Lee, Jong-Eun,Yun, Yeo-Uk,Kim, Kab-Cheol,Ko, Do-Young,Kim, Byeong-Ho,Kim, Hyeon-Ji,Park, Sang-Jo,Lee, Seong-Tae,H 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.5
Indicators of environmental conditions qualitatively and quantitatively describe the state of the environment and natural resources, and the OECD (Organization for Economic Cooperation and Development) has initiated and suggested AEIs (Agri-Environmental Indicators) to assess trends over time of the effects of agriculture on the environment and the effectiveness and efficiency of agricultural and environmental policy measures since 1990's. This study aims to develop the state indicators of water quality for agricultural water, surface and groundwater, to evaluate the environmental impacts of agricultural activities and policies by qualifying the environmental levels of a nation. Status indicators were calculated according to the agricultural water quality standards of OECD and Korea, and their trends were analyzed over time. Particularly, nitrate ($NO_3{^-}$) status indicators of ground water in 2013 were significantly lower than the ones in 2000. Overall, the water quality indicators of surface water in 2013 were higher than the ones in 2012, except for pH and DO. The groundwater quality indicators in 2013 were lower than those of previous years. The optimal management indicators were calculated to assess agricultural surface water and groundwater quality. The findings of this study indicated that the state indicators could play a significant role to establish policies and procedures for managing and conserving water resources. This study also discussed water pollution caused by agricultural and industrial effluents.