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... environment, where employees use their own devices for work Any app therefore has to work across all the mobile platforms as well as provide levels of security that will keep the IT department happy Security ... is a big issue, says Seth Berman, executive managing director of Stroz Friedberg, a consultancy “Mobiles are computers and can be hacked,” he says He also points out that people view their phones ... personal devices and often “ignore the rules” set by their IT and compliance departments For example, he says, it is difficult to get users complying with the need to record SMS messages Another...

Ngày tải lên: 04/12/2015, 00:10

... depending on mobile phones As the result, many of them have received the bad effects from the mobile phone itself From this real situation together with negative effects caused by mobile phones, ... The mobile phone has been admitted to offer plenty of benefits, but it is also said to create too many troubles, in deed The fact is that the Thuong Tin high school students are abusing the mobile ... Especially Vietnam has experienced the integration of mobile phone into society Progress has been made to the point that small, reasonable mobile phones with expanded capabilities (applications)...

Ngày tải lên: 13/12/2013, 12:15

Ngày tải lên: 07/03/2014, 02:20

Ngày tải lên: 23/03/2014, 05:22

... “Report on reo search methodologies for the experiments,” Tech Rep., MOBILE3 DTV, 2008, http://sp.cs.tut.fi /mobile3 dtv/results/ tech/D4.2 Mobile3 dtv v2.0.pdf 22 [9] S Jumisko-Pyykk¨ and T Utriainen, ... matter in quality evaluation of mobile television?” in Proceedings of the 10th International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI ’08), pp 63–72, ACM, ... study on mobile 3D video transmission Our results show the impact of different settings like coding method, frame error rate, or error protection strategies on the perceived quality of mobile 3D...

Ngày tải lên: 21/06/2014, 05:20

... [14] Lee and Li [15] Tag TH The same time stamp (((1 + RL)/2) ∗ c + 1)TH The same time stamp 2TH Different time stamp ((1 + RL)/2)TH Different time stamp 3(RS − TS)TH Dimitrou [16] ((1 + RL)/2)TH ... apply to a multi-reader situation or to mobile RFID networks Since Dimitrou’s delegation protocol [16] is designated for mobile readers, it can be applied in a mobile RFID environment However, back-end ... authenticated Then, we will deal with three situations in terms of time stamp First If RID j ’s time stamp RSi is bigger than the tag’s time stamp TSi and the received reading times RC ij = 0, it means the...

Ngày tải lên: 21/06/2014, 11:20

... 10 20 30 40 50 60 70 80 90 100 Average number users per cell 500 IoT samples 1000 IoT samples 5000 IoT samples 10000 IoT samples Figure 11: SINR distribution in overloaded cell no.11 with and ... C-tuples {v1,s , v2,s , , vC,s } with s = S containing samples of the random variables v1 , v2 , , vC As long as the number of samples S is sufficiently large, we can get a good approximation ... network planning or for coarse studies to understand the interrelations of new features, for example, heterogeneous networks [12] In this work we will present the theoretical framework for a...

Ngày tải lên: 21/06/2014, 11:20

... Networking several questions may be raised What mobile Web Services can we choose? What about the design guidelines for mobile devices? Or, there are used mobile development best practices? These issues ... paradigms, and semantics to the world of mobile devices applications Developing for Mobile Devices Web development involves the creation of optimized Web pages for mobile devices Standard Web programming ... the client’s time stamp, trying to improve contrast on the mobile device Domain name system (DNS) reverse lookup to give the location of the client is also used The time stamp is calculated with...

Ngày tải lên: 21/06/2014, 11:20

... “Sports Live Broadcasting” service as an example The scenario is the last round of the football league where more than one team has the chance to win the champion All teams start playing at the same ... QoS metadata can also be generated by users For example, Bob can tag a CAM entity indicating the relevant service inside is not suitable for a mobile device with limited bandwidth Usually, it ... provider-generated Mobile Mashup Architecture In this section, we firstly describe the mashup framework in detail Then we propose the extension of session negotiation 4.1 NGN-Based Mobile Mashup Framework...

Ngày tải lên: 21/06/2014, 11:20

... decisions based on a prior information of moving schedule of the mobile nodes Such schemes are not suitable to the MANETs of interest where mobile nodes move randomly (freely) without known schedule ... seamless communication for mobile nodes, the system has a number of supernodes that are interconnected over the Internet backbone Each supernode is responsible for a set of users (mobile nodes), and ... messages as it can result in a reduced DS, as will be discussed next A Network Example In this section, we consider an example based on a typical simulation experiment to show how the different algorithms...

Ngày tải lên: 21/06/2014, 11:20

... This way mobile mesh clients can perform seamless handovers between access points In parallel to the wireless mesh architecture, in our system model, we have the presence of independent mobile ... two-party in all other cases Let us provide an example to demonstrate the attributes of the proposed algorithm The reference node for this example will be node a During the initial 3-d or aggressive ... “A dynamic key agreement mechanism for mission critical mobile ad hoc networking,” in Proceedings of the 2nd International Conference on Mobile Lightweight Wireless Systems, Barcelona, Spain,...

Ngày tải lên: 21/06/2014, 11:20

... and J P Sheu, “The broadcast storm problem in a mobile ad hoc network,” in Proceedings of the 5th Annual ACM/IEEE International Conference on Mobile Computing and Networking (MobiCom ’99), pp ... authentication in mobile ad-hoc networks,” Journal of Communications and Networks, vol 11, no 5, pp 509–517, 2009 [20] S Capkun, L Buttyan, and J P Hubaux, “Self-organized public key management for mobile ... path discovery in mobile ad-hoc networks,” Computer Communications, vol 30, no 7, pp 1498–1512, 2007 [23] R Li, J Li, P Liu, and H.-H Chen, “On-demand publickey management for mobile ad hoc networks,”...

Ngày tải lên: 21/06/2014, 11:20

... System Model and Forumlation 2.1 System Model We consider a mobile multicast system with one base station (BS) multicasting to a group of N mobile receivers The system architecture between the BS ... on packet level Reed-Solomon codes were proposed in [18] for downlink multicast in the Universal Mobile Telecommunications Systems (UMTS) It has been concluded in [18] that these proposed HARQ ... performance analysis more practical In order to solve the scalability problem for applying ARQ to mobile multicast, we develop network-coding-based ARQ (NC-ARQ) schemes in which multiple retransmission...

Ngày tải lên: 21/06/2014, 17:20

... their countermeasure according to each Mobile WiMAX network domain Finally, we present security architecture of Mobile WiMAX network as called Robust and Secure MobilE WiMAX (ROSMEX) The rest of this ... features in Mobile WiMAX Moreover, this paper analyzes the known existing security vulnerabilities and attacks [7–10] 2.1 Overview of Mobile WiMAX Security IEEE 802.16e-2005 amendment-based Mobile ... Network (CSN) SS means one of the mobile devices that would like to join Mobile WiMAX network ASN is a complete set of network functions needed to provide radio access to Mobile WiMAX subscribers ASN...

Ngày tải lên: 21/06/2014, 17:20

... destinations For example, a group of tourists in New York City EURASIP Journal on Wireless Communications and Networking may travel to visit the Metropolitan Museum together and they use their mobile phones ... source is known For example, knowing that a crime occurred, which requires a law enforcement action, but without knowing where it occurred is useless Localization of the mobile nodes can be achieved ... decision and long-term storage capability, data-centric storage in mobile wireless networks must take mobility into consideration In mobile wireless networks, when a node stores its data on other...

Ngày tải lên: 21/06/2014, 18:20

... degradation of the throughput, which is noticeable in mobile ad hoc scenarios After all, maintaining the NPT table with “fresh” data is not realistic in a mobile ad hoc environment taking into account ... expected, (ii) the same verification as above but in mobile conditions, (iii) tuning RatioCollTHR in order to find the best threshold in static and mobile conditions, (iv) verification of the importance ... urban area, 50 static nodes Power basic-static SNAPdMac-static SNAPdMac -mobile Figure 6: General results, 50 static and mobile nodes performance of the throughput fairness, which is improved tremendously,...

Ngày tải lên: 21/06/2014, 22:20

... j) = and as the mobile nodes move around, if they sample areas not covered by the static sensors, then our confidence increases and continues to increase as the mobiles take more samples Furthermore, ... of the mobile node (i.e., searching for a source or coverage) If a mobile node m is in searching mode and also in communication range with other mobiles, then it queries its neighboring mobiles ... problem and predetermine the path that each mobile sensor node should follow in order to sample the areas least covered In the proposed approach, mobile nodes navigate through the sensor field...

Ngày tải lên: 21/06/2014, 22:20

... Calegari, F Guidec, P Kuonen, and D Wagner, “Genetic approach to radio network optimization for mobile systems,” in Proceedings of the 47th IEEE Vehicular Technology Conference (VTC ’97), vol ... 1997 [3] X Huang, U Behr, and W Wiesbeck, “Automatic base station placement and dimensioning for mobile network planning,” in Proceedings of the 52nd IEEE Vehicular Technology Conference (VTC ’00),...

Ngày tải lên: 21/06/2014, 22:20

... user movement from a sample location NK to C at a predefined direction See the university campus map (Figure 9) where the tests were realized For the purposes of the test, five mobile devices were ... throughput of mobile devices An interesting solution (Microsoft US patent [9]) in this field needs to know all information (AP location, SS power, etc.) of all wireless base stations in mobile device ... on wireless connected mobile devices is very important with regards to the idea of using a prebuffered data for increasing transfer speed through WiFi connection on PDA mobile devices The general...

Ngày tải lên: 21/06/2014, 22:20

... samples in time to estimate the statistical characteristic of the spatial channel [2, 3] This approach avoids the effect of frequency selective fading However, it is difficult to obtain enough samples ... Therefore, we can obtain enough samples to estimate the spatialchannel basis in both the time and frequency domains In this paper, we propose a beamforming scheme that uses samples from both the time ... TDD switch and a low-noise amplifier (LNA) The TDD switch isolates the transmit and receive signals from each other in accordance with the DL and UL duration The LNA amplifies the received signal...

Ngày tải lên: 21/06/2014, 23:20