-Steganography is a skill to convey the secret data in the digital images without getting any unexpected notices to attackers. LSB replacement, the simplest method, directly replaces the secret bits with LSB bit plane. Unfortunately, it is insecure because it cannot resist against the visual attacks and statistic detection. The original work was proposed by Chang et al. in 2010, and their work ...

Abstract The Chang 7 oil group in the Ordos Basin has characteristics of a tight lithology, low formation pressure coefficient and strong reservoir heterogeneity. To better determine reasonable developmental technical countermeasures, oiliness, seepage capacity, compressibility evaluations are combined. Using combination field practice laboratory experiments, six types sweetness classification ...

The proposal for increasing the security in Computerized Adaptive Tests that has received most attention in recent years is the a-stratified method (AS - Chang and Ying, 1999): at the beginning of the test only items with low discrimination parameters ( a ) can be administered, with the values of the a parameters increasing as the test goes on. With this method, distribution of the exposure rat...

In this paper, a novel steganographic method, based on JPEG and Particle Swarm Optimization algorithm (PSO), is proposed. In order to improve the quality of stego-images, an optimal substitution matrix for transforming the secret messages is first derived by means of the PSO algorithm. The standard JPEG quantization table is also modified to contain more secret messages. The transformed message...

a Department of Nuclear Medicine, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan b Department of Medical Oncology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan c Department of Head and Neck Oncology Group, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan d Department of Otorhinolaryngology, Head and Neck Surgery, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan...

1 Department of Medical Imaging and Intervention, Linkou Chang Gung Memorial Hospital, 5 Fu-Hsing Street, Gueishan, Taoyuan 33333, Taiwan 2Department of Medical Imaging and Radiological Sciences, College of Medicine, Chang Gung University, Taoyuan 33333, Taiwan 3 Institute of Radiological Research, College of Medicine, Chang Gung University, Taoyuan 33333, Taiwan 4Department of Nephrology, Eras...

Department of Pediatric Neurology, Chang Gung Children’s Hospital, Taoyuan; and Department of Neurology, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan. Received: 29 November 1999. Revised: 30 December 1999. Accepted: 7 March 2000. Reprint requests and correspondence to: Dr. Long-Sun Ro, Department of Neurology, Chang Gung Memorial Hospital, and Chang Gung University, 19...

Chang CH, Chang FM, Yu CH, Liang RI, Ko HC, Chen HY. 2000. Fetal ear assessment and prenatal detection of aneuploidy by the quantitative three-dimensional ultrasonography. Ultrasound Med Biol 26: 743–749. Chang LW, Chang FM, Chang CH, Yu CH, Cheng YC, Chen HY. 2002. Prenatal diagnosis of fetal multicystic dysplastic kidney with two-dimensional and three-dimensional ultrasound. Ultrasound Med Bi...