Published in 2015
Nithin.S.Sivan
Device to device communication is enabled the content discovery mechanism,that provide the users to steer their request to the adjacent nodes or group. This method proposes the content centric routing in device-to-device architecture based on WiFi direct.This also implements the intra- and inter-group bidirectional communication.This proposed method involved the content advertising and requesting among members of the multi-group network.Lastly evaluate theperformance of the architecture on real test bed involving portable devices in different group configurations.
content discovery, content-centric, energy efficient.
G.Karthikeyan, Prof S.Sakthivel
When formulating linear programming problem, variables should have been regarded as taking integer
values. Problems in which this is the case are called integer program. In this paper a new algorithm to solve integer
linear programming problems is given. This algorithm consists of two steps. In step 1 the intercepts of a promising
variable based on the different constraints are found out. Using the intercept matrix obtained for all the promising
variables, a maximum of m variables are selected and arranged where m is the number of constraints. Also the
maximum value that each of the arranged variable can assume is found out. In step 2, the arranged variables are
allowed to enter into the basis with an integer value which is less than the maximum value it can assume. Step 1 and
2 are repeated till no variable could enter with integer value. In the proposed integer linear programming algorithm
the improved solution moves in the interior of the feasible region.
Arrangement of variables, feasible solution, algorithm
N.Poonguzhali, K.Sumathi
In modern day’s concurrency computing systems are discussed in two-fold areas, first, distributed system; concurrency is caused by the fact that the individual components are active. They evolve independently, and sometimes they communicate with each other in order to synchronize or to exchange data. Second, View all object-oriented systems as inherently concurrent, since objects themselves are “naturally concurrent” entities. In reality, concurrency adds a new dimension to system structure and design. Concurrent systems are extremely difficult to understand, design, analyze and modify. Transaction processing, concurrency control and recovery issues have played a major role in conventional databases, and hence have been an important area of research for many decades. However, with the increasing use of advanced database applications such as CAD/CAM, large software design projects, object-oriented databases both in centralized and distributed environments, there is a vital need for better algorithms for handling the new applications more efficiently. In this paper, we present a study on the concurrency control and transaction controls. We have discussed the work process in the area of transaction modeling, its applications in object-oriented and databases.
Concurrency control, Transaction, Distributed System, Object-Oriented System
N.Valarmathi, R.Bharathi
In digital forensics, to recover the damaged or altered video file plays a crucial role in probing for evidences to determine a criminal case. File recovery techniques make use of the file system information that remains after deletion of a file. By using this information, many files can be recovered. For this technique to work, the file system information needs to be correct. If not, the files can’t be recovered. If a system is formatted, the file recovery techniques will not work either. Carving deals with the raw data on the media and doesn’t use the file system structure during its process. Although carving doesn’t care about which file system is used to store the files, it could be very helpful to understand how a specific file system works. This paper presents a study of recovery and carving technique of a corrupted video file using the specifications of a codec used to encode the video data.
File recovery, carving, frame, video encode and decode
K.Premalatha, M.Suriya
Time synchronization plays a critical role in distributed network systems. In this paper, we investigate the time synchronization problem in the context of underwater sensor networks (UWSNs). Although many time-synchronization protocols have been proposed for terrestrial wireless sensor networks, none of them can be directly applied to UWSNs. This is because most of these protocols do not consider long propagation delays and sensor node mobility, which are important attributes in UWSNs. In addition, UWSNs usually have high requirements in energy efficiency. To solve these new challenges, innovative time synchronization solutions are demanded. In this paper, we propose a pair wise, cross-layer, time-synchronization scheme for mobile underwater sensor networks, called DA-Sync. The scheme proposes a framework to estimate the Doppler shift caused by mobility, more precisely through accounting the impact of the skew. To refine the relative velocity estimation, and consequently to enhance the synchronization accuracy, the Kalman filter is employed. Further, the clock skew and offset are calibrated by two runs of linear regression. Simulation results show that DA-Sync outperforms the existing synchronization schemes in both accuracy and energy efficiency.
Sensor networks, Time Synchronization, data fusion, energy efficiency
C.Priya, M.Suriya
Secure data transmission is a critical issue for wireless sensor networks. Clustering is an effective and practical way to enhance the system performance of WSNs. A secure data transmission for cluster-based WSNs is studied, where the clusters are formed dynamically and periodically. User propose two Secure and Efficient data Transmission protocols for CWSNs, called SET-IBS and SET-IBOOS, by using the Identity-Based digital Signature scheme and the Identity-Based Online/Offline digital Signature scheme, respectively. In SET-IBS, security relies on the hardness of the Hellman problem in the pairing domain. SET-IBOOS further reduces the computational overhead for protocol security, which is crucial for WSNs, while its security relies on the hardness of the discrete logarithm problem. We show the feasibility of the SET-IBS and SET-IBOOS protocols with respect to the security requirements and security analysis against various attacks. The calculations and simulations are provided to illustrate the efficiency of the proposed protocols. The results show that, the proposed protocols have better performance than the existing secure protocols for CWSNs, in terms of security overhead and energy consumption.
Cluster, Secure, data transmission, Key Management, Wireless sensor Network
B.Saranya, K.Sumathi
Durable query scheme is used to find objects in historical time series databases. Durable queries can be extended for multidimensional time series analysis. Aggregate scoring function is used to rank the series at every time instance in top-k search. Euclidean distance measure is used in KNN queries at each timestamp between the reference series. Time series analysis plays an important role in predicting the status of the query, at every time stamp to retrieve efficiently. Studies have shown that different approaches are used for different queries over time series. The paper tries to survey some improved methods and have experimentally tested their effectiveness. Besides, it also studies some future directions on historical time series queries.
Top K Queries, Temporal Time Serious, Durable Query
S.Mythili, Dr.N.Rajendran
A wireless ad hoc network is a collection of independent nodes or stations which communicate with each other by creating a multihop radio network. Ad hoc wireless networks present even greater challenges than infrastructure wireless networks at the MAC layer. MAC protocols are of significant importance since the wireless communication channel is inherently prone to errors and unique problems such as the hidden-terminal problem, the exposed-terminal problem, deafness and signal fading effects etc. Medium access control (MAC) protocols provide a means to nodes to access the wireless medium efficiently and collision free to the best of their ability. In this paper we provide some information about MAC and issues of MAC protocols.
ad hoc networks, MAC protocols, IEEE 802.11
Kiruba.J, Suganya.A, Ramamani.S
Image fusion has become a widely used tool for increasing the interpretation quality of images in medical applications. The acquired data might exhibit either good functional characteristic (such as PET) or high spatial resolution (such as MRI). The MRI image shows the brain tissue anatomy and contains no functional information. The PET image indicates the brain function and has a low spatial resolution. Hence, the image fusion task is carried out to enhance the spatial resolution of the functional images by combining them with a high-resolution anatomic image. A perfect fusion process preserves the original functional characteristics and adds spatial characteristics to the image with no spatial distortion. The intensity-hue-saturation (IHS) algorithm and the retina-inspired model (RIM) fusion technique can preserve more spatial feature and more functional information content, respectively. The presented algorithm integrates the advantages of both IHS and RIM fusion methods with Relighting to improve the functional and spatial information content. Visual and statistical analyses show that the proposed algorithm significantly improves the fusion quality in terms of: entropy, mutual information, discrepancy, and average gradient; compared to fusion methods including, IHS, Brovey, discrete wavelet transform (DWT), à-trous wavelet and RIM
Magnetic Resonance Imaging(MRI), Computed Tomography(CT), Positron Emission Tomography(PET), Retina-Inspired Model(RIM), Inner Plexiform Layer(IPL)