In this paper, based on the concept of Code Division Multiple Access (CDMA), we propose an innovative secret message multiplexing scheme by digital image data hiding. messages distributed for several participants are encoded into a CDMA codeword through and then embedded grayscale image. At receiving side, each intended recipient will be assigned distinct spreading code as key extraction. way, ...

فوس لا اذ ه يف مدقن ثحب ماظن اً ً لاما آ لع فرعتلل ى تاملآ ) ةي سرافلا ة يطخلا قيلعت سن ( ب ا مادختس ةر يغتملا تلااحلا لوطو ةرمتسملا تادهاشملا فثا كتو يفخلا فوآرام ليدوم (CDVDHMM) . يفو ة لحرم لع لوصحلاو زيو نلا ءا غلإو يرنيا ب تا يلمع د عب ة مدقملا ميد قتلا ى ءازجلأا لا مادخت سا مت ي ةلصتم ةديدج ةيمزراوخ رئاسو طاقنلاو طباهلاو دعاصلا فشكل ءازجلأا يسيئرلا ريوصتلا نم اهبطشو ةيوناثلا . مث ذيفنت متي...

conclusions this study provides initial data on the prevalence and distribution of the flaa, cadf, ciab, cdtb, cgtb, docc and wlan genes in c. jejuni. background campylobacter jejuni (c. jejuni) is a major cause of human diarrheal disease. objectives this study was conducted to determine the prevalence of different pathogenic genes in isolates recovered from human stool samples in rosario, arge...

In this paper, we propose a new fast-frequencyhopping code-division multiple-access (FH-CDMA) scheme for wireless communication systems, in which Reed-Solomon (RS) codes are modulated on top of FH-CDMA for supporting higher data rate than conventional M -ary frequency-shiftkeying FH-CDMA (MFSK/FH-CDMA) scheme and our recently proposed prime/FH-CDMA scheme. The performance of the RS/FH-CDMA sche...

Precision time protocol (PTP), a state-of-the-art clock synchronization primarily designed for wired networks, has recently gained attention in the wireless community, due to increased use of IEEE 802.11 local area networks (WLAN) real-time distributed systems. However, all existing WLAN-based PTP designs either incorporate software timestamping (TS) delivering poor accuracy, or hardware (HW) T...

Next Generation Networks (NGNs) are primarily propelled by huge potential market for systems of communication and services to suit individuals, which yield ubiquitous and tether-less access to users. Providing seamless handover and ubiquitous services in NGN presents many new research challenges. Priority based call management scheme is necessary to provide low call dropping probability for hig...

Much of interest has been involved in integrating UMTS and WLAN networks in order to take full advantage of the two. In such an integrated network, UMTS subscribers can access to UMTS services through 3G or WLAN access networks. This is highly desirable because network operators will use WLAN hotspots to increase network coverage, while offering subscribers with high-speed connections to 3G net...

The integration of wireless local area networks (WLANs) and the high speed wide area network (WAN) using ‘always on’ broadband access that could provide an efficient and cost effective inter-WLAN mobility management requires the current WLAN internetworking protocol enhanced. The Inter Access Point Protocol (IAPP) defines methods for access point coordination over a distribution system to suppo...

Current trends show that UMTS network and WLAN will co-exist and work together to support more users with higher data rate services over a wider area. However, this integration invokes many challenges such as mobility management and handoff decision making. Vertical handoff is switching process between heterogeneous wireless networks in a 3G/WLAN network. Vertical handoffs often fail due to the...

Much of interest has been involved in integrating UMTS and WLAN networks in order to take full advantage of the two. In such an integrated network, UMTS subscribers can access to UMTS services through 3G or WLAN access networks. This is highly desirable because network operators will use WLAN hotspots to increase network coverage, while offering subscribers with high-speed connections to 3G net...