An Enhancement Role and Attribute Based Access Control Mechanism in Big Data

To be able to leverage big data to achieve enhanced strategic insight and make informed decision, an efficient access control mechanism is needed for ensuring end to end security of such information asset. Attribute Based Access Control (ABAC), Role Based Access Control (RBAC) and Event Based Access Control (EBAC) are widely used access control mechanisms. The ABAC system is much more complex in terms of policy reviews, hence analyzing the policy and reviewing or changing user permission are quite complex task. RBAC system is labor intensive and time consuming to build a model instance and it lacks flexibility to efficiently adapt to changing user’s, objects and security policies. EBAC model considered only the events to allocate access controls. Yet these mechanisms have limitations and offer feature complimentary to each other. So in this paper, Event-Role-Attribute based fine grained Access Control mechanism is proposed, it provide a flexible boundary which effectively adapt to changing user’s, objects and security policies based on the event. The flexible boundary is achieved by using temporal and environment state of an event. It improves the big data security and overcomes the disadvantages of the ABAC and RBAC mechanisms. The experiments are conducted to prove the effectiveness of the proposed Event-Role-Attribute based Access Control mechanism over ABAC and RBAC in terms of computational overhead

A Fundamental Study on Research Challenges Associated with Social Network Analysis

Obtaining large scale data is one of the key challenges in studying social interaction. Understanding social interaction has been a great interest in various research field like sociology, economy, political science, marketing and so on. This paper studies the “need to know” basics about social media, social network and Social Network Analysis[SNA]. In this paper along with introducing some of the studies in this area, a categorization of research subareas was presented and a base has been provided for researchers to briefly get acquainted with some new, attractive and useful research areas. This information has never been available with such a huge volume, detail, and ease and speed of access before. A few number of social data analyst those who are interested in having this information or the results of analyzing it alongside their motivations are: commercial companies for advertising and promoting their products, sociologists for analyzing the behavior and features of different societies, intelligence organizations for preventing and detecting criminal activities, educational and cultural activists for promoting their goals, and employers for acquiring information about job seekers. This paper will sought after for the purpose of having precise knowledge for critically analyzing Social Networks, social media their analytics and their related challenges and opening areas

The ribbonfish resources

Che ribbonfishes are an important group of food fishes in India and their annual average production during 1971-*82 was estimated at 55,300 tonnes which formed 4.3% of the total marine fish landings and occupied 7th position. The studies indicate that various species of ribbonfishes constitute substantial fishery in the States of Andhra Pradesh, Tamil Nadu, Kerala and Maharashtra showing considerable variations in the species composition, season^ abundance and production trends

Determination of the relative fishing powers (power factors) of the vessels of the Government of India deep sea fishing station, based at Bombay.

The Government of India Deep Sea Fishing Station at Bombay and the Offshore Fishing Stations at Veraval, Mangalore, Cochin, Visakhapatnam and Tuticorin have been employing in the exploratory fishing operations different types of power vessels which vary greatly in their gross tonnage, net tonnage, brake horse power, length of body, draught etc. even though most of them use more or less the same or similar types of otter trawls. It is well known that, suitably geared a larger boat would generally bring about a greater fishing mortality than a smaller one in a unit amount of time when fishing in the same ground. The capacity of a vessel to catch more or to catch less as compared with another vessel is independent of the density of the population and is related in some way to the makeup of the vessel itself. In computing catch statistics of different vessels, 'standardisation of fishing time according to their fishing powers' (Beverton and Holt 1957, P. 172) being essential, the present work has been attempted based on available data from the exploratory fishing operations of the vessels viz-, 'Jheenga', 'Bumili' and 'Meera' from Bombay

Relative abundance of trawl fishes in the Bombay-Saurashtra waters

With the help of skilled Japanese technicians very intensive commercial fishing by two pairs of bull trawlers, ' Arnalla'—' Paj' and ' Satpati'—' Pilotan ' (each of 29 meters length, 250 BHP and about 91 gross tonnage) of the New India Fisheries Company, Bombay, was carried out from April 1956 to October 1963 in Bombay- Saurashtra waters, landing a total catch of 26,304 metric tons offish sold at a whole sale price of about Rs. 1.6 crores (Anon, 1965). The annual effort varied from 2,850.97 hours to 5,453.27 hours and the catch rates from 601.60 to 899.70 kg. per hour of trawling for a pair of vessels. Fishing by these vessels was preceded by exploratory buU-trawling by the Government of India cutters, M. T. Ashok and M. T. Pratap of the Deep Sea Fishing Station, Bombay during 1953-'55. These cutters, prior to 1953 using otter trawl had annual catch rates varying from 94.4 to 195.4 lbs. per hour of fishing, but during 1953-'55 when they had taken to the Japanese method of paired trawling (bull-trawling) the average catch per vessel had gone upto 1,562.4 lbs. per hour of trawling (Jayaraman et al., 1959). The present report shows that the best of trawling grounds in Bombay-Saurashtra waters are in Kutch region, the fishery potential of which was hitherto unexplored

Coastal Aquaculture - Mussel farming; Progress and prospects

During the seventies, the Central Marine Fisheri^ lleseardi Institute gave a lead in researches on mariculture and has carved for itself a pioneering role in the R& D programmes of mariculture in the countiy which has been well recognised. Impressed by the outstanding contributions made during the decade, the infrastructure facilities built up and, above all, the scientific and techni<ial competence it has acquittdi jm UNDP/ICAR Centre of Advanced Studies in Mariculture has been instituted at the Central Marine Fisheries Research Institute since June 1979. The Centre aims at providing postgraduate education in the new discipline of Mariculture and improvmg the quality of research through doct(»ral and post-doctoral research programmes in identified areas. One of the priority areas of mariculture in India is mussel culture. Although considered a poor relation of the oyster in Europe, mussel has one of the highest potentials in India for increaang production of protein- rich sea food. Mussel gives the highest conversion of primary producera ^hytojrfankton) to human food and culture production in column waters enhances the yield several fold. India has a traditional sustenance fishery for the mmsels at a few centres but the scope for increasing natural production from the existing beds is rather limited

The present status of ribbonfish fishery in India

The ribbonfishes, of the family TrichiurkJae, an Important group of food fishes in India, registered an average annual catch of 53.475 tonnes during 1970-81. In this period, forming 4.25% of the total marine fish catch, thsy formed the 7th exploited fish group in the order of predominance. There are 8 known ribbonfish species in India (an identification key to the species is given in the beginning of thearticle) The information available on the various aspects of biology of each of these species is summarised, which clearly indicates that while our knowledge on the biology of Trichiurus lepturua, Lepturecanthus savale, Eupleurogrammus nwticus and Eupleurogrammus glossodon is considereble, we know little about the other species. Traditionally, the ribbonfishes are caught by boatseines, shoreseines, bag nets and gill nets, operating from nonpowered country crafts. But, during the last two decades, the small mechanized vessels (10-15 m long, with 15-100 hp engines) that are operating otter trawls, too, are increasingly landing ribbonfish. The fishery is confined to the depth-zone usually shallower than 50 m. T. lepturus, the most widely distributed, forms the mainstay of the ribbonfish fishery, contributing to the bulk of the landings along almost all our coastline. Data on spatial and seasonal variations in abundance, size and age composition in the commercial catches and diurnal movements and depthwise distributions of shoals of this species are therefore reviewed. Stock assessment studies show that, in the shelf region from Ratnagiri on the west coast round to Gulf of Mannar on the east, there had been an average standing stock of 67,200 tonnes of ribbonfish (mostly L Lepturus) in 1972-75, which is about 4 times what was actually landed from the region during the period. It therefore follows that a doubling of the catch will not adversely affect the stock in the region. Studies on the population dynamics of T. lepturus from the Kakinada area during 1967-71 has shown that the fishing mortality and the exploitation rates are low, at 0.3 and 0.17 respectively. The average annual stock and average standing stock along the Andhra and Tamil Nadu coasts are estimated at 85,000 and 48,000 tonnes, respectively, for T. lepturus, against an estimated annual average catch of 14,400 tonnes during 1967-71. It thus appears that the stock of T. lepturus along the east coast also is likewise underfishad, The need for extension of fishing operations into the Exclusive Economic Zone with larger vessels, equipped with suitable gears like bottom and pelagic trawls, is emphasized- Suggestions on future lines of research are given

Modeling Basal Ganglia for understanding Parkinsonian Reaching Movements

We present a computational model that highlights the role of basal ganglia (BG) in generating simple reaching movements. The model is cast within the reinforcement learning (RL) framework with the correspondence between RL components and neuroanatomy as follows: dopamine signal of substantia nigra pars compacta as the Temporal Difference error, striatum as the substrate for the Critic, and the motor cortex as the Actor. A key feature of this neurobiological interpretation is our hypothesis that the indirect pathway is the Explorer. Chaotic activity, originating from the indirect pathway part of the model, drives the wandering, exploratory movements of the arm. Thus the direct pathway subserves exploitation while the indirect pathway subserves exploration. The motor cortex becomes more and more independent of the corrective influence of BG, as training progresses. Reaching trajectories show diminishing variability with training. Reaching movements associated with Parkinson's disease (PD) are simulated by (a) reducing dopamine and (b) degrading the complexity of indirect pathway dynamics by switching it from chaotic to periodic behavior. Under the simulated PD conditions, the arm exhibits PD motor symptoms like tremor, bradykinesia and undershoot. The model echoes the notion that PD is a dynamical disease.Comment: Neural Computation, In Pres

Distribution of resonances for open quantum maps

We analyze simple models of classical chaotic open systems and of their quantizations (open quantum maps on the torus). Our models are similar to models recently studied in atomic and mesoscopic physics. They provide a numerical confirmation of the fractal Weyl law for the density of quantum resonances of such systems. The exponent in that law is related to the dimension of the classical repeller (or trapped set) of the system. In a simplified model, a rigorous argument gives the full resonance spectrum, which satisfies the fractal Weyl law. For this model, we can also compute a quantity characterizing the fluctuations of conductance through the system, namely the shot noise power: the value we obtain is close to the prediction of random matrix theory.Comment: 60 pages, no figures (numerical results are shown in other references

The controlled catalytic oxidation of furfural to furoic acid using AuPd/MgIJ(OH)2

© 2017 The Royal Society of Chemistry. The emphasis of modern chemistry is to satisfy the needs of consumers by using methods that are sustainable and economical. Using a 1% AuPd/Mg(OH) 2 catalyst in the presence of NaOH and under specific reaction conditions furfural; a platform chemical formed from lignocellulosic biomass, can be selectively oxidised to furoic acid, and the catalyst displays promising reusability for this reaction. The mechanism of this conversion is complex with multiple competing pathways possible. The experimental conditions and AuPd metal ratio can be fine-tuned to provide enhanced control of the reaction selectivity. Activation energies were derived for the homogeneous Cannizzaro pathway and the catalytic oxidation of furfural using the initial rates methodology. This work highlights the potential of using a heterogeneous catalyst for the oxidation of furfural to furoic acid that has potential for commercial application