PURKH (E-Journals)
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State of Internet of Things (IoT) Security Attacks, Vulnerabilities and Solutions
Get PDFInternet of things (IoT) security is the technology area concerned with safeguarding networks and connected devices in the internet of things (IoT). IoT involves adding internet connectivity to a system of mechanical and digital machines, interrelated computing devices, animals, people and/or objects. Each "thing" is provided a unique identifier and the ability to automatically transfer data over a network. Allowing devices to connect to the internet opens them up to a number of serious vulnerabilities if they are not properly protected. In this paper, we discuss the different attacks and vulnerabilities which is classified by layer in the architechture. We also proposed solutions to mitigate and counter these attacks and vulnerabilities
The Energy Efficient FIR Filter for Biomedical Application using FPGA
No full textThis research work proposes a low power Finite Impulse Response (FIR) digital filter system using Field Programmable Gate Array (FPGA) to filter biomedical signals. A major issue regarding such implementations is associated with computational complexity that may hinder its practical application. Several researches that aim to overcome this problem have been found by using various designs like booth multiplier, distributive arithmetic design, reduce adder graph (RAG), common sub-expression elimination method etc. This work has achieved the target of power line frequency of 50Hz noise cancellation. It is shown that the proposed design using RAG can give faster speed and require less hardware resources than that for the Direct Structure-I design. The performance of the proposed method is also compared with several existing research works to study its efficacy and it is shown that proposed design can achieve nearly 2% area delay product and 43% less power consumptions in implementation of an FIR low-pass filter. The designed filter is also tested on ECG waves as example of biomedical signal from samples of the MIT-BIH Arrhythmia database corrupted with power frequency noise. The entire system has been implemented on the ALTERA DE-II FPGA education board by synthesizing Verilog HDL using Quartus II tool
Why Estimation Method of Recurrence Time Transition Probabilities with Regard to Genetic Algorithms Without Bit Mutation?
Get PDFRespecting genetic algorithms without bit mutation, our study is to submit unprecedented algorithm to procure tentative and notional results respecting recurrence time transition probabilities estimation for transient states.  
Any L-States Solutions of The Modified Schrodinger Equation with Generalized Hellmann–Kratzer Potential Model in The Symmetries of NRNCQM
Get PDFIn the present research paper, the approximate analytical solutions of the modified radial Schrodinger equation (MSE) have been obtained with a newly proposed potential called generalized Hellmann–Kratzer potential (GHKP) model by using the improved approximation scheme to the centrifugal term for any l-states. The potential is a superposition of the Hellmann–Kratzer potential model and new terms proportional with (1/ r3, 1/ r4, exp (-ar)/r2 and exp (-ar)/r3), appears as a result of the effects of noncommutativity properties of space and phase on the Hellmann–Kratzer potential model. We applied the generalized Bopp’s shift method and standard perturbation theory, in the nonrelativistic noncommutative three-dimensional real space phase (NC: 3D-RSP) instead to solving MSE directly with star product. The bound state energy eigenvalues for the some diatomic molecules such as, N2, CO, NO and CH and obtained in terms of the generalized the Gamma function, the discreet atomic quantum numbers ((j, n, l, s, and m)), two infinitesimal parameters(a, b) which are induced automatically by position-position and phase-phase noncommutativity properties, in addition to, the dimensional parameters (V1, V, a, re, De) of GHKP model. Furthermore, we have shown that the corresponding Hamiltonian operator in (NC: 3D-RSP) symmetries is the sum of the Hamiltonian operator of the HKP model and two operators, the first one is the modified spin-orbit interaction while the second is the modified Zeeman operator for the previous diatomic molecule
Borohydride Reduction of Cobalt Oxide (Co3O4) Nanoparticles
Get PDFRecently, magnetic nanomaterials have been used in a wide range of applications such as medicine and electronics. In this research, rod-like shaped cobalt oxide magnetic nanoparticles (Co3O4) were synthesized by a simple co-precipitation method using cobalt chloride as a precursor and sodium borohydride (NaBH4) as reducing agent. Their structural and surface morphological properties were characterized by high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and vibration sampling magnetometer with (VSM). XRD measurement exhibited the structure of Co3O4 nanocrystals for annealed samples. The TEM results showed the cobalt oxide nanoparticles with good uniformity in the range size of 10-40 nm. The SEM images revealed that the particles changed from spherical shape to rod-like shape with increasing temperature. Magnetic measurements showed the coercive field of around 84.5G and saturation magnetization of annealed of around 9.83 emu/g
Characterization and Compositional Analysis of Indian Black Aggregate as a Concrete Raw Material
Get PDFThe study is conducted to find the applicability of Indian black aggregate as a concrete material through a series of physiochemical and surface morphological investigation. The report reveals the effects of different chemical properties on concrete performance which ultimately affect life period of any structure. Mineralogical and Chemical characterization of the aggregate was analysed by UV visible spectroscopy (UV-vis), X-Ray Fluorescence (ED-XRF) and X-Ray Diffraction (XRD). Scanning electron microscopy (SEM) used to know Surface morphology of the aggregate. It was observed that studied aggregate contains high amount of MgO (4.36%) and Fe2O3 (14.84%). However, it is quite stable up to 800 oC with loss of only 1.58% of gross weight. The surface morphology analysis clearly revealed the existence of Calcite, Quartz and Dolomite materials in studied aggregate
Imidazole and its Saturated Derivatives Vs Pyrazole and it Saturated Derivatives: A Computational Study on Relative Stability
Get PDFPossible structures of imidazole, pyrazole, and their semi saturated and fully saturated derivatives have been studied at the DFT and ab initio computational levels. Calculations have been performed using several computational schemes (BLYP, PBE0, CAM-B3LYP, wB97XD, M06, MP2, CBS-QB3, and G4 methods have been employed) and the 6-311++G** basis set. The most stable structures for each group of studied compounds (tautomers of native imidazole and pyrazole, tautomers of their semi saturated derivatives, and fully saturated derivatives) have been determined. In general species with imidazole ring are more stable than those with pyrazole one. The discussion of this phenomenon origin, especially the influence of aromaticity as well as distributions of total charge and energy among atoms are thoroughly discussed
Mixed-Ligand Complexes of Co(II), Ni(II) And Cu(II) with Mercaptosuccinic Acid And 1, 10-Phenanthroline in Dimethylformamide Media
Get PDFThe ternary systems of Co(II), Ni(II) and Cu(II) complexes with Mercaptosuccinic acid as Primary Ligand and 1, 10-Phenanthroline as Secondary Ligand are investigated. The stability constants of the complexes were determined pH metrically in Dimethylformamide medium at 303K and I = 0.16 mol/L NaCl. The predominant species detected are MLX, ML2X, MLXH and MLX2H. Models containing different numbers of species were refined by using the computer program MINIQUAD75. The best-fit chemical models were arrived at based on statistical parameters. The relative stabilities of the ternary complexes and species distributions of all complexes in solution were evaluated
Assessing The Implementation Challenges of the Procurment Act of Ghana: The Newmont Ghana Experience
Get PDFThe Public Procurement Act of 2003 was initiated to address the weaknesses which were impregnated in the Public Financial Management Reform Programme (PUFMARP). The goals of the Acts among others were to harmonise public procurement processes, practices, and secure judicious economic and efficient use of state funds and to possibly ensure that public procurement is fair, transparent and non-discriminatory. The research therefore assessed the challenges influencing the implementation of the Public Procurement ACT 663 and its Amended Act 914 on procurement practitioners, where the main variables included strategic planning, regulation enforcement and organizational culture. Through a survey research design, the study targeted procurement officers’and contractor bodies working with Newmont Ghana Gold Ltd. Convenience sampling technique was used to select a sample of 50 respondents. Interviews and questionnaires were used in the data collection. Quantitative data collection was analyzed by the use of descriptive statistics using Microsoft Excel and presented through frequencies and percentages.
The findings revealed that 75% of the respondent believed that Newmont’s strategic plan has the relevant performance pillars. The study showed that 47.5% said the impact of regulation enforcement on Newmont’s procurement activities is moderate. The findings also revealed that 47.5% of the respondent strongly agreed on the issue that Newmont’s culture favors good procurement procedures.In conclusion, the outcome suggested that, the Public Procurement Act can be carried out effectively if the strategic plan, regulation enforcement and organizational culture support the procurement systems in place. On recommendation, the researcher observed that Procurement process should uphold integrity and ensure that there are no malpractices and there is informed decision-making
E-commerce as a Vehicle Towards Sustainable National Development in Nigeria: Prospects and Challenges
Get PDFThe emergence of Information and Communication Technology (ICT) has created a lot of opportunities for its end users, globally. However, despite the recognized embedded benefits of e-commerce, its utilization for sustainable national development in Nigeria is still largely low. On this basis, this paper discusses the prospect of e-commerce as a vehicle towards sustainable national development in Nigeria, and the challenges militating against its adequate adoption. The Diffusion of Innovation Theory was employed as conceptual framework. The paper argues that e-commerce can contribute in multiple ways to the actualization of the Nigeria’s drive towards the attainment of sustainable national development through the improvement of the Nigerian banking sector, the promotion of indigenous entrepreneurship, increase in foreign exchange, and the development of small and medium scale businesses. However, despite its embedded advantages, digital divide, illiteracy, skepticism/distrust, fear of cybercrime exposure and poor access to relevant information are among the major challenges militating against the successful adoption of electronic commerce in Nigeria. The Nigerian Government should exert more efforts towards effective domestication of E-commerce because it is capable of contributing significantly to the successful actualization of the nation’s vision 2020 plan and the attainment of its sustainable development goals