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Asian immigrants' mental health service use: An application of the life course perspective

Asian American Journal of Psychology, 2012

The census projects that the Asian population in the United States will double over the next 20 y... more The census projects that the Asian population in the United States will double over the next 20 years, with much of the growth fueled by immigration and population aging. An empirical understanding of Asian immigrants' mental health needs across the lifespan exists, but the knowledge base is less developed in terms of mental health help-seeking. To prepare for population aging that reflects the diversity among Asian-American groups, this study applies the life course perspective to examine variations in mental health service use by age and Asian ethnic group membership. Using data from the National Latino and Asian American Study (NLAAS), this study applies the life course perspective to investigate how age and ethnicity affect mental health service use among Asian immigrants. The results of a logistic regression analysis showed each age increase for Chinese and Vietnamese was associated with a decrease in the likelihood that they would seek mental health services compared with Other Asians. Implications for mental health service delivery to Asian immigrants as they age and acculturation are discussed.

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An Efficient Identity-based Broadcast Signcryption Scheme

Journal of Software, 2012

Broadcast signcryption, which enables the broadcaster to simultaneously encrypt and sign the cont... more Broadcast signcryption, which enables the broadcaster to simultaneously encrypt and sign the content meant for a specific set of users in a single logical step, provides the most efficient solution to this dual problem of confidentiality and authentication. Recently, several identity-based broadcast signcryption (IBBSC) schemes have been proposed. However, we find almost all IBBSC schemes that have been proposed until now do not satisfy register secrecy and forward secrecy. Following this, we propose a new IBBSC scheme and formally prove its security under the random oracle model for broadcast signcryption (IND-CCA2 and EUF-CMA) While we propose a secure IBBSC scheme, we do not compromise the performance. The proposed scheme only requires two pairing operations for end user devices with limited computing capability.

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Steganalysis for Reversible Data Hiding

Communications in Computer and Information Science, 2009

In recent years, several lossless data hiding techniques have been proposed for images. Lossless ... more In recent years, several lossless data hiding techniques have been proposed for images. Lossless data embedding can take place in the spatial domain or in the transform domain. They utilized characteristics of the difference image or the transform coefficient histogram and modify these values slightly to embed the data. However, after embedding message bits these steganography changed the nature of the difference image histogram or the transform coefficient histogram gradually. In this paper, we introduce two new steganalytic techniques based on the difference image histogram and the transform coefficient histogram. The algorithm can not only detect existence of secret messages in images which are embedded by above methods reliably, but also estimate the amount of hidden messages exactly.

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Novel Algorithms to Steganalysis of Uncompressed and Compressed Images

2009 International Conference on Knowledge and Systems Engineering, 2009

A large number of commercial steganographic programs use the least significant bit (LSB) embeddin... more A large number of commercial steganographic programs use the least significant bit (LSB) embedding as the method of choice for message hiding in 24-bit, 8-bit color images and grayscale images or non-zero DCT coefficients (compressed images - JPEG images) and DWT coefficients of high subbands (compressed images - JPEG2000 images). It is commonly believed that changes to the LSBs of

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A watermarking method robust for copyright protection of images against print-scan

IET International Conference on Information Science and Control Engineering 2012 (ICISCE 2012), 2012

In this paper, a state art of robust watermarking techniques was first presented, Print-scan resi... more In this paper, a state art of robust watermarking techniques was first presented, Print-scan resistant digital watermarking algorithm, used in the environment of print and scan, will be able to solve the issue of copyright protection in the printed works. The robustness of a perceptual watermarking scheme based on a PJND (Pyramidal Just Noticeable Difference) model. Desynchronization attack known to be one of the most serious threats for any watermarking system. To cope with this type of attacks, we have proposed an approach based on the SIFT (Scale Invariant Feature Transform) and our PJND model adapted for the DoG (Difference of Gaussians) representation. The idea is to use JND to determine the optimum strength for embedding the watermark to provide an invisible and robust watermarking scheme. The image is first decomposed into a multi-resolution representation using the pyramidal decomposition. Then, a perceptual model is proposed to compute the JND value for each pixel at each Laplacian level. This model takes into account three main characteristics of the Human Visual System (HVS), namely: contrast sensitivity, luminance adaptation and contrast masking. The performance of the proposed technique is evaluated in terms of transparency, using subjective and objective tests, and robustness to different attacks from global transformation (Rotation, Scaling, etc) to local transformation (StirMark), including Print-Scan and Print Screen.

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The method of hiding steganography without key exchanging and original image

2012 IEEE International Conference on Computer Science and Automation Engineering (CSAE), 2012

This paper presents a novel algorithm of hiding secret messages by applying mathematical lemmas a... more This paper presents a novel algorithm of hiding secret messages by applying mathematical lemmas and information theory. The proposed algorithm can hide more information with acceptable embedded rate and achieves requirements of information hiding algorithm and simply information extracting. The main idea is applying modern algebra to solve the information hiding problem in multimedia. In order to prevent some attacks on stganography, hidden initial bits of image data pixels are chosen randomly. The extracted information are achieved without the reference of the original image and extracted keys. The experiment results show that our approach is effective and reliable.

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