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Data Hiding Method with Quality Control for Binary Images 被引量:1
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作者 Ki-Hyun Jung kee-young yoo 《Journal of Software Engineering and Applications》 2009年第1期20-24,共5页
Secret data hiding in binary images is more difficult than other formats since binary images require only one bit repre-sentation to indicate black and white. This study proposes a new method for data hiding in binary... Secret data hiding in binary images is more difficult than other formats since binary images require only one bit repre-sentation to indicate black and white. This study proposes a new method for data hiding in binary images using opti-mized bit position to replace a secret bit. This method manipulates blocks, which are sub-divided. The parity bit for a specified block decides whether to change or not, to embed a secret bit. By finding the best position to insert a secret bit for each divided block, the image quality of the resulting stego-image can be improved, while maintaining low computational complexity. The experimental results show that the proposed method has an improvement with respect to a previous work. 展开更多
关键词 DATA Hiding QUALITY CONTROL BINARY IMAGES
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Greenhouse Gas Emissions and Cost Analyses for the Treatment Options of Food Waste and Human Excrement
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作者 Sora Yi kee-young yoo 《Journal of Environmental Protection》 2014年第7期597-607,共11页
This study suggested environmental and economic evaluations by developing a scenario according to the various treatment options of food waste in Korea. In particular, the study evaluated the possibility about the comb... This study suggested environmental and economic evaluations by developing a scenario according to the various treatment options of food waste in Korea. In particular, the study evaluated the possibility about the combined treatment of food waste and human excrement after using food waste disposers (FWDs). The scenario including only composting (133 kg CO2 equiv./ton-household organic waste) or only FWDs (125 kg CO2 equiv./ton-household organic waste) was superior to the other scenarios in the environmental aspect and the scenario including only composting (101 USD/ton-household organic waste) was superior to the other scenarios in the economic aspect. However, the study discovered that 52% of greenhouse gas emission was reduced when sewage pretreatment was conducted in houses after using FWDs and also when biogas was collected on site and utilized in the private power station. Furthermore, the energy saving effect due to recovery of biogas has found to be larger in the environment aspect than in the economic aspect. 展开更多
关键词 FOOD WASTE Disposer FOOD WASTE Drying Machine COMPOSTING BIOGASIFICATION Automatic Vacuum WASTE Collection System
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