Research articles list

Recently, wireless sensor networks (WSNs) have been deployed for a wide variety of applications, including military sensing and tracking, patient status monitoring, traffic flow monitoring, where sensory devices often move between different locations. Securing data and communications requires suitable encryption key protocols. In this paper, we propose a certificateless-effective key management (CL-EKM) protocol for secure communication in dynamic WSNs characterized by node mobility. The CL-EKM supports efficient key updates when a node leaves or joins a cluster and ensures forward and backward key secrecy. The protocol also supports efficient key revocation for compromised nodes and minimizes the impact of a node compromise on the security of other communication links. A security analysis of our scheme shows that our protocol is effective in defending against various attacks.We implement CL-EKM in Contiki OS and simulate it using Cooja simulator to assess its time, energy, communication, and memory performance.

Dr H Shaheen

This study examined the spatial distribution pattern of public lower basic schools for the implementation of lower basic education in Rivers State. One research question guided the study. The descriptive survey design was used. The population for the study was the 942 public lower basic schools in Rivers State. Stratified random sampling technique was used to draw the sample size of 289 schools. A handheld Global Positioning System receiver was the instrument used for the study. Nearest neighbour analysis was used to answer the research question. Findings revealed that the overall pattern of distribution of existing public lower basic schools in Rivers State is clustered. Specifically the distribution of schools in Degema and Akuku-Toru Local Government Areas is dispersed with Rn of 1.72 and 1.36 respectively. The pattern of distribution of Bonny, Opobo/Nkoro, Abua/Odual, Port Harcourt, Obio/Akpor and Ikwerre indicates a clustered pattern with Rn of 0.91, 0.83 0.84, 0.74, 0.72 and 0.24 respectively. The study therefore recommended among other things that the state governments should make policies that guide school mapping and ensure their strict compliance. Since school mapping is an integral aspect of micro-planning, every local government should be statutorily required to have a comprehensive school map of its area that should be updated at least every decade. The services of professional planners should be utilized by the Ministry of Education and should also ensure that modern mapping equipment are deployed for this very important exercise.

FXintegrity Publishing

The daily water distillation of the single basin conventional solar still is limited. In the present work, experimental analysis of a parabolic disc type solar still and conventional solar still are investigated. The solar radiation is focused to the single point to produce higher basin temperature. The water is flown continuously inside the copper receiver to utilize the incident solar radiation. The hourly readings were taken to analyze the thermal performance of the parabolic disc type solar still and conventional solar still. The water collection of parabolic disc type solar still is increased about 40% over conventional solar still.

Appadurai M

Physically unclonable function (PUF) is a hardware security module preferred for hardware feature based random number and secret key generation. Security of a cryptographic system relies on the quality of the challenge-response pair, it is necessary that the key generation mechanism must unpredictable and its response should constant under different operating condition. Metastable state in CMOS latch is undesirable since it response becomes unpredictable, this feature used in this work to generate a unique response. A feedback mechanism is developed which forces the latch into the metastable region; after metastable state, latch settle to high or state depends on circuit internal condition and noise which cannot be predicted. Obtained inter hamming variation for 8 PUF is 51% and average intra hamming distance is 99.76% with supply voltage variation and 96.22% with temperature variation.

Abhishek Kumar

One of the unique features of Indian society is prevalence of caste system which was originated thousands of years back to demarcate the people engaged in different occupation or jobs. Initially it was not much rigid but gradually people belonging to upper castes for their own selfish means to maintain their monopoly made this arrangement hereditary and started treating people of lower castes disgracefully. For preservation of this system, people started controlling their women to prevent inter-caste marriages and the concept of endogamy came up. This robbed away many types of freedom from women. For women belonging to lower castes, this situation is worse as they are doubly subjugated on the basis on caste as well as gender. Men belonging to their own caste treat them as secondary beings. This paper throws light on this intersection. How intersection of these two kinds of inequalities place them at the lowest position in Indian society. Dr. B.R. Ambedkar rises as their leader who all his life worked for empowerment of downtrodden section of society. He argues that education is the primary tool for evading these differences among people. He further emphasizes to adopt the concept of exogamy to break the backbone of Indian caste system and to immediately leave a religion or culture which legitimizes such system of inequality among people of the same land.

Swati sharma

One of the unique features of Indian society is prevalence of caste system which was originated thousands of years back to demarcate the people engaged in different occupation or jobs. Initially it was not much rigid but gradually people belonging to upper castes for their own selfish means to maintain their monopoly made this arrangement hereditary and started treating people of lower castes disgracefully. For preservation of this system, people started controlling their women to prevent inter-caste marriages and the concept of endogamy came up. This robbed away many types of freedom from women. For women belonging to lower castes, this situation is worse as they are doubly subjugated on the basis on caste as well as gender. Men belonging to their own caste treat them as secondary beings. This paper throws light on this intersection. How intersection of these two kinds of inequalities place them at the lowest position in Indian society. Dr. B.R. Ambedkar rises as their leader who all his life worked for empowerment of downtrodden section of society. He argues that education is the primary tool for evading these differences among people. He further emphasizes to adopt the concept of exogamy to break the backbone of Indian caste system and to immediately leave a religion or culture which legitimizes such system of inequality among people of the same land.

Swati sharma

Abstract __ Considering the size and relevance of coffee industry to the Ethiopian economy this work presents the design, prototype development, analytical and numerical simulation as well as experimental investigation on an active solar coffee dryer. The solar collector and dryer system configuration has been optimized for minimal pressure drop by incorporating guide vanes and minimizing flow separation tendency using numerical simulation on ANSYS. The effect of air mass flow rate on optimal depth of collector, temperature rise and pressure drop were characterized including the effect of variation in solar insolation using CFD approach. By comparing different dryer configurations based on pressure drop and air flow uniformity, a new dryer configuration prototype was developed. In addition, thermal performance of the solar air heater was evaluated experimentally at three different airflow rates on a collector with corrugated absorber plate and another collector with flat absorber plate. High collector outlet temperature and efficiency were observed in a collector with corrugated absorber plate. The effect of depth of grain, moisture content on wet basis, airflow rate and humidity of air were explored for parametric sensitivity vis-à-vis drying time. Within 5 hours, coffee bean dried from 29% moisture content to 12.3% on a clear sunny day and within 7hours from 19% moisture content to 11.1% on a partially overcast day. Average thermal efficiency of the dryer was found to be 50.5% for clear sunshine day and 36.9% for partial overcast day. A good agreement has been observed between the experimental results and the CFD temperature rise predicted output with a deviation of 7.5%. Analytically predicted drying time compared with experimentally measured drying time within a 12.9% deviation. The cost -to-benefit analysis with a comparative assessment on traditional mode of coffee drying has been done and the payback period is found to be 1.03 years with significant benefits.

Tefera Abera

Our research is a contribution to the analysis of emergent practices in the mediatization of the Gospel. It mobilizes an intercultural approach of the appropriation of the TIC by social actors at ends of proselytism and propaganda. The mobilized problem is that of the seduction in the media revival of the neo-pentecostal leaders. By supporting us on an observation of the practices of the TVevangelism in Cameroon, we analyze the emergent social uses of the audio-usual mediums at ends of proselytism and propaganda. Our research reveals the interest to go beyond the deterministic analyses of the development of the TIC to propose an intercultural analysis which underlines the sociocultural contingency of the movement of emergence and development of the TIC. The aim is to propose an intercultural analysis which underlines the sociocultural contingency of the movement of emergence and development of the TIC in Africa.

Tedongmo Teko

Brilliant Grid is intended to incorporate progressed correspondence/organizing innovations into electrical power frameworks to make them ''more intelligent''. The current circumstance is that a large portion of the power outages and voltage lists could be forestalled in the event that we have better and quicker specialized gadgets and advancements for the electrical matrix. To make the flow electrical force lattice a Smart Grid, the plan and execution of another correspondence framework for the lattice are two significant fields of examination. Be that as it may, Brilliant Grid projects have just been proposed as of late and a couple of recommendations for forward-looking necessities and starting exploration work have been offered in this field. No efficient audits of correspondence/organizing in Smart Grids have been led at this point. In this manner, we direct an orderly survey of correspondence/organizing innovations in Smart Grid in this paper, including correspondence/organizing engineering, distinctive correspondence innovations that would be utilized into this design, nature of administration (QoS), upgrading the use of resources, control and the board, and so forth.

Dr.A.Shaji George

Solar Energy is the prime important source of energy, and it has continued to gain popularity globally. As of 2018, about 486 GW of solar PV was installed worldwide. One of the key requirements for socio-economic improvement in any nation of the world is the provision of dependable electricity supply systems. Recently, there is a massive growth in access to solar electricity in several Africa countries, notably South Africa, Egypt, Morocco, and Algeria. As a result, it decreases the global population without access to electricity with an appreciable value. This paper review the present state of solar energy capacity in the world also identifies vital approaches of improving their functionality, reliability, and affordability as well as the essential method that policymakers may implement in the future. The result shows that there is a recurrent growth in solar energy annually and as at the end of 2018 Asia with the largest capacity of 56.58%, while Central America and the Caribbean have the lowest installed capacity of 0.36%. As the request for an uninterrupted supply increases in different regions, progressive builders are embracing solar photovoltaics (PV) renewable energy as an option for their customers.

Najeem Olawale Adelakun

The identification of isomorphism in epicyclic gear trains has been found a lot of attention by researchers for the last few years. Various methods have been suggested by different authors for the detection of isomorphism in planer kinematic chains and epicyclic gear trains (EGTs), but everyone has found some difficulties to address new issues. In this paper, a modified path matrix approach was presented in order to compare all the distinct geared kinematic mechanisms. A new method based on the matrix approach and corresponding train values is required to identify isomorphism among epicyclic gear trains and their mechanisms. The proposed method was examined on the basis of various examples from four-link, five-link, six links, and eight-link one-degree-of-freedom EGTs and six links two-degree-of-freedom EGTs. All the examples have been found satisfactory results with existing literature.

JIYAUL MUSTAFA

Abstract Abundant solar energy is freely available almost round the year in India. As per the current scenario of global warming and climatic change, solar energy is the cleanest source in nature. Concentrated solar power (CSP)has hardly contributed to the overall installed solar power capacity in the country. CSP technologies are Parabolic Trough Collector (PTC), Linear Fresnel Reflector (LFR), Paraboloid Dish and Solar Power Tower. This paper presents a review of CSP in solar parabolic dish concentrator to understand thermal aspect like thermal efficiency, optical efficiency, useful heat gain, heat losses, solar irradiation, etc. for various applications and current development. The current scenario of global CSP is discussed to meet the future challenges and need of the society.

Pramod Wadate

Investigating school performance and competencies, especially on leadership, received a considerable attention in the past. In fact, there have been multitudes of evidence that leadership can impact school performance, student achievement, or outcome. Also, there was no single measurement of school performance. This study examined the influence of leadership and core behavioral competencies on the school performance of school heads. This was to build a new model of school performance. Using an explanatory research design, it administered a survey questionnaire to 192 randomly chosen school heads from the 37 districts of Department of Education Division of Surigao del Sur. Also, it used data mining for the performance ratings of school heads from the division office. Regression analysis tested three hypothesized models of school performance where leadership and core behavior competencies serve as independent variables. Results showed that leading people was a significant predictor of school performance. Thus, leading people can best explain the school improvement as a proposed model. The results have implications for future research, leadership practice, and theoretical development of school performance model among school heads.

Manuel Caingcoy

Recently, research capability has received an overwhelming and remarkable interest among academics and practitioners. This is timely since the Department of Education had institutionalized research and encouraged teachers to engage in it to support evidence-based practice, decision-making, policy, and program development. On these premises, a study was carried out to assess the research capability of public teachers in Malaybalay City, determine its correlates and determinants. It utilized descriptive, correlational, and explanatory designs. It administered survey questionnaires to 92 participants. Data were analyzed using descriptive and inferential statistics. The results revealed that teachers were slightly capable of conducting research and having neutral attitudes toward it, motivated to write research, had a high level of difficulties in research processes, and moderately capable of action planning. They also show evidence of potential in mentoring. Further, mentoring and action planning skills, motivation to write research, attitudes toward research, and the number of studies completed by teachers were the correlates of their research capability at different magnitudes of the relationship. Notably, the research capability of teachers had a low, negative but significant relationship with their age and accumulated years of service. Thus, this capability deteriorates as they age and accumulate years of service. The motivation to write research, the number of studies completed, and age were the determinants of research capability. It was concluded that research capability can be determined and predicted by how motivated teachers are to write research, how productive they are in research, and how young they are when they engage in this rigorous endeavor. The study identified and recommended topics for continuing professional development.

Manuel Caingcoy

Gender Bias is an ambivalent issue all over the world. Understanding the values of being a man on women by one another may solve many consequences in future. Gender Bias will be dismissed by empowering women in the society. Because of the Gender Bias particularly women are in despaired state. UNO and many organizations have taken many decisions and efforts to empower women which will reduce the impacts of Gender Bias. Even though women are empowered we didn’t get remarkable result yet. Even our society is ridicule get ride from traditional customs but women themselves are opponent for accepting new rules and liberations. Empowering women is a mandated one; it is not implemented properly empower must bring the equal rights to women.

Priya darshini

Plants are an ancient source of medicine due to the presence of bioactive molecules of various compounds in their different parts. Convolvulus dorycnium plant belongs to the family of wind plants (convolvulaceae). The greatest variety of Convolvulus plants are broadly distributed over the world and was found in Western and Central Asia, Mediterranean, Macaronesia, East Africa, and Arabia. The plant C. dorycnium was collected from Tarhuna in Sidi Said area of Libya in May 2013. Plants belonging to Convolvulus genus contain various phytochemicals profiles. The focus of this study is on the phytochemical analysis of convolvulus dorycnium including phytochemical screening, extraction, isolation, and characterization. The phytochemical screening reveals the presence of flavonoids, tannins, saponins, steroids, carbohydrate, and coumarin in ethyl acetate and methanolic extract. Column chromatography and column chromatography and TLC were used to fractionate the ethyl acetate extract and H-NMR was used to elucidate the isolated compounds. Some compounds were isolated from the aerial parts of the plant; scopoletin, which is a phenolic coumarin (1) (7-hydroxy-6-methoxy coumarin), caffeic acid (2) (3,4-dihydroxycinnamic acid), and ferulic acid (3) (4-hydroxy-3-methoxy cinnamic acid) which are phenolic acids. The chemical constituents present in the extract have been reported to possess many biological activities

Mediterranean Journal of Pharmacy and Pharmaceutical Sciences

Étudier les phénomènes grammaticaux actuels sans s’interroger sur la longue trajectoire historique qui a servi de support et de canal au français moderne manquerait de pertinence. En effet, une telle étude permet une meilleure compréhension des phénomènes linguistiques contemporains. Ainsi, notre domaine de recherche, la linguistique diachronique, met l’accent sur les connaissances étymologiques de la langue. Il s’agira, pour les besoins de l’article, de rendre compte de l’évolution morphologique du présent de l’indicatif depuis le latin jusqu’au français moderne. Notre curiosité nous poussera à nous interroger sur les raisons qui expliquent l’écart morphologique du présent de l’indicatif entre le latin et le français moderne. En sus, l’étude des variations diachroniques du présent de l’indicatif renseigne sur les formes actuelles de ce temps verbal. Du latin au français moderne, le présent de l’indicatif subit des flottements aussi bien dans ses radicaux que dans ses désinences. Ceci met en chef l’écart formel existant entre le présent latin et celui du français actuel. Toutefois, les phonèmes subirent des transformations selon qu’ils étaient toniques ou atones, radicaux ou désinentiels. Certaines formes se sont maintenues avec modification ou non de sons; d’autres ont complètement disparues du système. Suivant un ordre chronologique et des lois phonétiques cohérentes, nous montrerons que les formes actuelles du temps le plus usuel du système, le présent, ne sont pas le fruit du hasard. De ce fait, la langue moderne gagnerait à revisiter la morphologie des temps verbaux depuis leur origine pour mieux asseoir les difficultés liées à la conjugaison et fournir une explication authentique sur les variations de forme jusque-là ignorées par certains.

ASSANVO

Dans toute société, l’homme nait, grandit et meurt. Ces étapes marquant la vie de l’être humain sont des passages obligés dans le parcours existentiel de tout être vivant. Si le premier et le deuxième éléments sont des moments de réjouissance pour les parents, les amis et la famille, le troisième par contre attriste, alite et est parfois source de discorde et de séparation des membres d’une même communauté. A la mort d’un parent, des soutiens de toutes natures viennent de toute part. Ces soutiens sont la manifestation de la solidarité au sein de nos communautés. Des chansons sont scandées avant, au cours et après l’inhumation. Comme on le constate dans plusieurs communautés linguistiques, ces chansons funéraires assument, dans la société, des fonctions diverses. Cette étude qui analyse quelques chansons aussi bien sur le plan social que linguistique, vise à montrer la valeur de la chanson et le sens qu’elle véhicule dans la communauté ajatado prenant en compte le Bénin, le Togo, le Ghana et le Nigéria sans oublier ses différentes fonctions dans la société.

ASSANVO

Cet article montre l’analyse des erreurs dans l’enseignement/apprentissage du Français Langue Étrangère au Ghana. Il a pour objectif principal d’analyser les erreurs commises en production écrite par les étudiants de Français Langue Étrangère (FLE) à l’Université du Ghana. Le corpus a été constitué du lexique de 100 apprenants. Les instruments de collecte des données ont été les questionnaires et les rédactions/compositions. Ces derniers ont été rédigés par les étudiants des niveaux 300 et 400. Etant donné la nature de l’étude, l’approche quantitative et l’approche qualitative ont été utilisées comme mode d’investigation. L’approche qualitative porte sur le modèle de l’analyse des erreurs proposé par Corder (1967) et l’approche quantitative met en évidence des données observables et quantifiables. Les principales erreurs rencontrées dans les productions écrites des étudiants ont été celles de la morphosyntaxe. Ces erreurs commises ont été analysés. Les recommandations de notre étude ont pour but d’améliorer la production écrite en Français Langue Étrangère.

ASSANVO

Le 05 décembre 2012, les pratiques et expressions culturelles liées au balafon des communautés sénoufo du Mali, du Burkina Faso et de la Côte d’Ivoire ont été inscrites sur la Liste représentative du patrimoine culturel immatériel de l’humanité. Le tafal-djéguélé est une pratique et expression culturelle liée au balafon des Sénoufo de Côte d’Ivoire. Deux raisons principales fondent son usage : amener les laboureurs à la houe à se surpasser d’une part, et magnifier les valeurs des senambélé1 d’autre part, notamment celles en rapport avec le labour étant donné que le sénoufo est agriculteur par essence. Toutefois, en raison de certains changements sociaux, le tafal-djéguélése pratique de moins en moins. Cette situation prive le senanw d’aujourd’hui d’un cadre majeur d’enseignement et de diffusion de valeurs, et pose ainsi la question de leur transmission aux générations actuelles et futures. Cet article vise à démontrer comment la faible pratique du tafal-djéguélé empêche de nos jours la transmission de "valeurs- références" en pays sénoufo, mais aussi à proposer des pistes de solutions.

ASSANVO