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This paper proposes a new scheme for ensuring data consistency in unstructured p2p networks where peers can subscribe to multiple content types (identified by labels) and are rapidly informed of content updates. The idea is based on using a static tree structure, the Cluster-K+ tree, that maintains most of the structural information about peers and labels. A label denotes a set of replicated or co-related data in the network. The Cluster-K+ tree provides efficient retrieval, addition, deletion and consistent updates of labels. Our proposed structure guarantees a short response search time of O(H + K), where H denotes the height of the tree and K the degree of an internal tree node. We present theoretical analytic bounds for the worst-case performance. To verify the bounds, we also present experimental results obtained from a network simulation. The results demonstrate that the actual performance of our system is significantly better than the theoretical bounds. 相似文献
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Lekan Oyedeji 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1992,38(4):363-373
Concern over short life expectancy in developing societies (such as in Nigeria), the generally poor economic plight of the elderly, and the ignorance and hardship being experienced by aging adults prompted an investigation into the determinants of longevity in 1984, with a view to seeking ways of increasing life span through the provision of appropriate education for the elderly. Since 1984 332 elders of 65 years and above in Nigeria have thus been interviewed. A study of 458 retired persons in Lagos State by a doctoral student was used to support the investigation. Observation of the responses shows that longevity is determined by several factors and combinations of factors ranging over closeness to and faith in God, heredity, modest living, moderation in everything, contentment and so on. The investigation also showed that most of the illiterate elders are poor and are going through the aging process in discomfort while the literate ones are experiencing aging gracefully. It was also found that most retirees were ill prepared for retirement and are maladjusting in post-retirement life.
Zusammenfassung Die Sorge um die kurze Lebenserwartung in den Entwicklungsländern (wie z. B. Nigerien), die allgemeine wirtschaftliche Notlage der Älteren und die Ignoranz und Schwierigkeiten, mit denen sich alternde Erwachsene auseinandersetzen müssen, führten 1984 zu einer Untersuchung über die Faktoren, die eine hohe Lebenserwartung bestimmen. Dabei sollte eine Erhöhung der Lebenserwartung durch ein engemessenes Bildungsangebot für Ältere in Betracht gezogen werden. Seit 1984 wurden in Nigerien 332 Menschen im Alter von 65 Jahren oder älter befragt. Zur Unterstützung der Untersuchung wurde die Studie eines Doktoranden über 458 pensionierte Menschen im Staat Lagos herangezogen. Eine Auswertung der Antworten zeigt, daß Langlebigkeit von verschiedenen Faktoren und Faktorkombinationen wie Nähe und Vertrauen zu Gott, Erblichkeit, bescheidene Lebensbedingungen, Bescheidenheit in allem, Zufriedenheit usw. bestimmt wird. Die Untersuchung förderte auch zutage, daß die meisten älteren Analphabeten arm sind und den Alterungsprozeß als etwas Negatives empfinden, während die lese- und schreibfähigen älteren Menschen das Alter als angenehm empfinden. Man fand auch heraus, daß die meisten Pensionäre schlecht auf das Pensionsalter vorbereitet sind und sich nur schwer an das Leben nach der Pensionierung anpassen können.
Résumé Le problème de l'espérance de vie courte dans les sociétés en développement (comme au Nigéria), la situation économique généralement pauvre des personnes âgées, l'ignorance et les privations que connaissent les personnes âgées ont inspiré une étude sur les éléments déterminant la longévité en 1984, en vue de chercher les moyens permettant d'accroître la durée de la vie grâce à un enseignement approprié destiné aux personnes âgées. Depuis 1984, 332 personnes de 65 ans et au-delà ont été interviewées au Nigéria. Une étude sur 458 retraités de l'Etat du Lagos effectuée par un étudiant en année de doctorat a été utilisée pour appuyer cette recherche. L'examen des réponses données montre que la longévité est déterminée par différents facteurs et combinaisons de facteurs concernant le rapport à Dieu et la foi en celuici, l'hérédité, un niveau de vie modeste, la modération dans tout, le contentement, etc. Cette investigation a, par ailleurs, montré que la plupart des personnes analphabètes âgées sont pauvres et traversent leur processus de vieillissement dans l'inquiétude, alors que les alphabètes le vivent aisément. Il a été également trouvé que la plupart des retraités se préparent mal à la retraite et s'adaptent donc mal à cette nouvelle vie.相似文献
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Tayo Oyedeji 《媒体管理杂志》2013,15(2):72-80
Abstract This study explores the validity of Meyer's (2004) influence model in the cable news network environment. The influence model proposes that news media organizations' profitability is linked to their societal influence, which depends on audiences' perceptions of their credibility and news quality. The results show a good fit between a structural equation model of the influence model and data from a survey probing respondents' opinions of CNN and Fox News Channel. The study also examines audience members' attitudes toward the two cable news networks and found that their opinions of CNN are significantly more positive. 相似文献
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Suitability of Stem Latex of Jatropha Gossypifolia as a Protein Precipitant for Biochemical Analysis
O. G. Adeosun T. Oduola F. A. Fagbomedo S. O. Oyedeji B. O. Akanji A. A. Adesina 《Indian journal of clinical biochemistry : IJCB》2014,29(2):210-212
The extract of Jatropha Gossypifolia stem was obtained by cutting the stem with a sharp knife and the fluid expressed out. The suitability of the stem latex extract as a precipitant for biochemical analysis was determined. The precipitating efficacy of the extract for creatinine and protein estimation was found to be optimum at 1/4 and 1/5 dilutions respectively aqueous solution. Plasma protein was precipitated with stem extract of J. Gossypifolia at the stated dilution. The mean plasma creatinine values obtained from 0.5 % sodium tungstate as a protein precipitant were compared with the values of plasma creatinine obtained when ¼ dilution of stem extract of J. Gossypifolia was used as protein precipitant. Similarly mean cerebrospinal fluid (CSF) and urinary protein values obtained from 3 % Tricholoro-acetic acid as protein precipitant were compared with values obtained from 1/5 dilution of stem extract of J. Gossypifolia as protein precipitant. The values obtained from the stem latex extract at the stated dilutions were comparable with values obtained from the conventional protein precipitants (p < 0.05). The stem latex extract of J. Gossypifolia is suitable as a protein precipitant for creatinine, CSF and urinary protein estimations. However further work need to be done to purify the extract and determine the exact concentration at the stated dilutions as well as the active ingredient in stem latex. 相似文献
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Tayo A. Oyedeji 《媒体管理杂志》2013,15(3):116-125
The Digital Video Recorder (DVR) was often considered the awaited revolution in the way people use television; however, TV recipients seem reluctant to adopt this innovation. This article suggests a new perspective in that the DVR should be interpreted as a supply-side service innovation instead of a hardware consumer innovation. Evaluating the perceived attributes of the DVR as an innovation, it turns out that the supply-side service innovation is more likely to succeed. The article discusses the possible impact of the DVR on the value chain of television and on the exploitation chain of motion picture rights. Focusing on the features of time shifting and advertising avoidance, it is shown that the relevance of broadcasters will diminish in comparison to the distributors'. Finally, the article discusses how the DVR might develop as a new profit window in the exploitation chain of motion picture rights and thereby make a lead into video distribution without a physical medium. Altogether, it is shown that the distributors will benefit more from the DVR than the recipients will, and therefore, it is indicated to change perspectives and evaluate the DVR as a supply-side innovation. 相似文献
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Mojeed O. Oyedeji Magdi S. Mahmoud Yuanqing Xia 《Journal of The Franklin Institute》2021,358(5):2826-2845
Multiagent systems are increasingly becoming popular among researchers spanning multiple fields of study. However, existing studies only models communication interaction between agents as either fixed or switching topologies described by crisp graphs supported by algebraic graph theories. In this paper, we propose an alternative approach to describing agent interactions using fuzzy graphs. Our approach is aimed at opening up new research avenues and defining new problems in coordination control especially in terms of dynamics between agents’ states, graph topologies and coordination objectives. This paper studies distributed coordination on fuzzy graphs where the edge-weights modeling network topologies are dependent on the states of the agents in the network. In hindsight, the network weights are adjustable based on the situational state of the agents. First, we introduce the concept of fuzzy graphs and give some distinguishing features from the crisp or fixed graphs. Next, we provide some membership functions to define the state-dependent weights and finally we use some simulations to demonstrate the convergence of the proposed consensus algorithms especially for cases where the agents are subject to system failures. 相似文献
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