Dual-image reversible data hiding(RDH)is a technique for hiding important messages.This technology can be used to safely deliver secret mes-sages to the recipient through dual images in an open network without being e...Dual-image reversible data hiding(RDH)is a technique for hiding important messages.This technology can be used to safely deliver secret mes-sages to the recipient through dual images in an open network without being easily noticed.The recipient of the image must receive the two stego-images before the secret message can be completely retrieved.Imperceptibility is one of the main advantages of data hiding technology;to increase the imperceptibility,the quality requirements of the stego-images are relatively important.A dual ste-ganographic image RDH method,called a DS-CF scheme that can achieve a bet-ter steganographic image quality using the center folding(CF)strategy.In this paper,we developed a translocation and switching strategy(TaS)to shorten the distances between the stego-pixel coordinates and the cover pixel coordinates after information being hidden.Compared with the DS-CF scheme,our proposed DS-TaS scheme can effectively improve the quality of the steganographic images at the same level of embedding capability.The experimental results show that the PSNR of our DS-TaS scheme at k=1 was 55.66 dB,which is an increase of 1.5 dB,and is 51.43 dB for k=2,46.66 dB for k=3,and 40.91 dB for k=4.In addition,the PSNR values of the stego images was increased by 1.5,0.29,0.29,and 0.19 dB,respectively.This shows that our proposed dual-image RDH method can optimize the visual quality of the stego-images and is better than many other dual-image RDH techniques.展开更多
Call center technology has been widely used in China, including industries of banking, railway, telecommunication, electron, insurance, and so on. But the actual effects and benefits brought by adoption of call center...Call center technology has been widely used in China, including industries of banking, railway, telecommunication, electron, insurance, and so on. But the actual effects and benefits brought by adoption of call center are really poor. This paper analyzes the situation of call center＇s adoption in several major industries in China and also analyzes the existing problems, From the point of view of strategies of enterprises and call center, this paper puts forward a set of strategic and theoretical suggestions for call center development in China.展开更多
This paper mainly focuses on university-level learners＇ autonomy in computer-assisted self-access English learning centers through exploring the self-access center in Chongqing University from three aspects： the gen...This paper mainly focuses on university-level learners＇ autonomy in computer-assisted self-access English learning centers through exploring the self-access center in Chongqing University from three aspects： the general survey, the function and the problems of the self-access center.展开更多
文摘Dual-image reversible data hiding(RDH)is a technique for hiding important messages.This technology can be used to safely deliver secret mes-sages to the recipient through dual images in an open network without being easily noticed.The recipient of the image must receive the two stego-images before the secret message can be completely retrieved.Imperceptibility is one of the main advantages of data hiding technology;to increase the imperceptibility,the quality requirements of the stego-images are relatively important.A dual ste-ganographic image RDH method,called a DS-CF scheme that can achieve a bet-ter steganographic image quality using the center folding(CF)strategy.In this paper,we developed a translocation and switching strategy(TaS)to shorten the distances between the stego-pixel coordinates and the cover pixel coordinates after information being hidden.Compared with the DS-CF scheme,our proposed DS-TaS scheme can effectively improve the quality of the steganographic images at the same level of embedding capability.The experimental results show that the PSNR of our DS-TaS scheme at k=1 was 55.66 dB,which is an increase of 1.5 dB,and is 51.43 dB for k=2,46.66 dB for k=3,and 40.91 dB for k=4.In addition,the PSNR values of the stego images was increased by 1.5,0.29,0.29,and 0.19 dB,respectively.This shows that our proposed dual-image RDH method can optimize the visual quality of the stego-images and is better than many other dual-image RDH techniques.
文摘Call center technology has been widely used in China, including industries of banking, railway, telecommunication, electron, insurance, and so on. But the actual effects and benefits brought by adoption of call center are really poor. This paper analyzes the situation of call center＇s adoption in several major industries in China and also analyzes the existing problems, From the point of view of strategies of enterprises and call center, this paper puts forward a set of strategic and theoretical suggestions for call center development in China.
文摘This paper mainly focuses on university-level learners＇ autonomy in computer-assisted self-access English learning centers through exploring the self-access center in Chongqing University from three aspects： the general survey, the function and the problems of the self-access center.
