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Issues on Digital Watermarking of Three Dimensional Models
Khin Khin Win,Jayoung Park,Sumi Yoo 한국산업경영시스템학회 2002 한국산업경영시스템학회 학술대회 Vol.2002 No.추계
At present, multimedia systems have recently gained more and more popularity due to the widely use of digitally formatted audio, video, and printed information in network environment. In such respect, there is a serious threat that authors, publishers and providers of multimedia data are reluctant to allow the distribution of their data in a network due to the ease of widespread redistribution in their original form likely to enhance copyright violation. One way to address the problem is to hide invisible data in the content that has to be protected. This technology is called watermarking and which is widely used for traditional multimedia data types such as images, video and audio. First related publications date back to 1979 and it gained a large international interest in 1990. In this paper, we introduce how and what the digital watermarking are undergone to three dimensional models.
Khin Pa Pa Wai,이재무,모황성,김병수 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.3
Pepper accessions that were selected for resistance to bacterial wilt were evaluated for their resistance to two strains (Rs004 and Rs005) in 2010 and three strains (Rs005, Rs006, and Rs010) in 2011 of the bacterial wilt pathogen, Ralstonia solanacearum. KC00121, KC00355, KC00359, KC01051, KC01052, KC01260, KC01261, and KC01263 showed a similar level of resistance as MC4 (KC00350), the worldly known source of resistance. Nuclear genotypes of restorer-of-fertility locus for the cytoplasmic male sterility of the accessions were identified by crossing them to a cytoplasmic male sterile line, Punggok-A (Srfrf) and examining the male fertility of the resultant F1 plants. KC00355, KC00359, KC01051, KC01052, KC01260, KC01261, and KC01263 were found to be maintainers of the Nrfrf genotype, whereas KC00121 was a restorer of fertility with the N(S)RfRf genotype.
Flow Interaction of Shedding Vortex with Injected Normal Blowing
Khin Oo Mon,Changjin Lee,Heeseok Koo 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.5
This paper is concerned with turbulent flow computations using Large Eddy Simulation (LES) and the flow interaction of vortex shedding in a cylindrical duct flow driven by mass blowing through the wall. The purpose is to analyze non-linear combustion characteristics in the presence of vortex shedding generated in a hybrid rocket motor. Experimental studies have shown sudden changes in pressure (referred as a DC-shift), which depend on the strength of vortex strength of incoming flow. The combustion instability because of a sudden change in pressure fluctuations is mainly related with the interaction between vortex shedding. Therefore LES computation on a duct with injected normal blowing was performed to simulate the turbulent flow interactions with the behaviors of vortices and vortex structures along the injected wall.
Khin Oo Mon,Heeseok Koo,Changjin Lee 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
Hybrid rocket shows interesting characteristics of complicated mixing layers developed by interactions between turbulent oxidizer flow and mass flow from surface due to fuel vaporization. In this study, compressible LES with a ring structure attached at the entrance of the combustor are performed. According to one recent report, adding a ring structure in the middle of the combustor helps increasing regression rate. From the numerical results, it is seen that vortex structures near the wall becomes stronger due to the interaction with surface mass injection, and the local heat flux increases due to the vortices. This phenomenon is obviously related to the generation of dimple structures which are seen in the number of experiments. Also, the ring structure at the entrance induces strong vortex flow which enhances heat transfer to the wall surface and mixing between fuel and oxidizer as well as reaction efficiency.
Internal Flow Dynamics by Large and Small Scales of Vortex Shedding by Inserting a Diaphragm
Khin Oo Mon,Changjin Lee 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
LES analysis was conducted to investigate the evolution of turbulent coherent vortices and the interaction and merging phenomenon of vortex by inserting a ring in the idealized hybrid rocket engine. Even though the chemical reaction was not considered, the calculation results can be useful in determining the turbulence characteristics generated by the ring. The calculation results show that the installation of ring (diaphragm) can introduce the additional turbulence and improve the fluctuated motion to the downstream flow. Calculation results revealed to understand the flow dynamics of large scales vortex on the upstream blowing surface and small scales vortex on the downstream blowing surface.
Khin Thanda Win,Chunying Zhang,Kihwan Song,Sanghyeob Lee 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Cucumber is a typical monoecious plant with individual male and female flowers, and sex expression in cucumber is mainly determined by three major genes: F/f, M/m and A/a. Gynoecy plays an important role in cucumber hybrid breeding and use of gynoecious lines as maternal parent ensures high productivity. The purpose of this study is to identify a co-dominant molecular marker linked to F locus to distinguish homozygous and heterozygous gynoecious plants for cucumber breeding programme. Firstly, we analyzed the sequence polymorphism of 5 gynoecious and 5 monoecious inbred lines to detect polymorphism to develop the marker linked to F locus. A pair of specific primer based on insertion/deletion polymorphism on branched-chain amino acid transaminase (BCAT) gene was designed and examined the polymorphism in the parents, F1 and F2 segregating population derived from gynoecious (WJEF11) and monoecious (WNEF8) inbred lines. The result showed that the specific fragment amplified with Cs-Female-F/Cs-Female-R, was identified as a co-dominant marker and co-segregated with sex phenotype in F2 population. Furthermore, we present a new linkage map for F locus using Indel markers. This is the first report for the development of F locus specific co-dominant marker which can distinguish homozygous and heterozygous gynoecious and it could be used in marker-assisted selection in cucumber breeding.