Exploiting information needs and bibliographics for polyrepresentative document clustering

In this paper we explore the potential of combining the principle of polyrepresentation with document clustering. Our idea is discussed and evaluated for polyrepresentation of information needs as wells as for document-based polyrepresentation where bibliographic information is used as representation. The main idea is to present the user with the highly ranked polyrepresentative clusters to support the search process. Our evaluation suggests that our approach is capable of increasing retrieval performance, but performance varies for queries with a high or low number of relevant documents

Constraint-based Query Distribution Framework for an Integrated Global Schema

Distributed heterogeneous data sources need to be queried uniformly using global schema. Query on global schema is reformulated so that it can be executed on local data sources. Constraints in global schema and mappings are used for source selection, query optimization,and querying partitioned and replicated data sources. The provided system is all XML-based which poses query in XML form, transforms, and integrates local results in an XML document. Contributions include the use of constraints in our existing global schema which help in source selection and query optimization, and a global query distribution framework for querying distributed heterogeneous data sources.Comment: The Proceedings of the 13th INMIC 2009), Dec. 14-15, 2009, Islamabad, Pakistan. Pages 1 - 6 Print ISBN: 978-1-4244-4872-2 INSPEC Accession Number: 11072575 Date of Current Version : 15 January 201

Collaborative spectrum sensing optimisation algorithms for cognitive radio networks

The main challenge for a cognitive radio is to detect the existence of primary users reliably in order to minimise the interference to licensed communications. Hence, spectrum sensing is a most important requirement of a cognitive radio. However, due to the channel uncertainties, local observations are not reliable and collaboration among users is required. Selection of fusion rule at a common receiver has a direct impact on the overall spectrum sensing performance. In this paper, optimisation of collaborative spectrum sensing in terms of optimum decision fusion is studied for hard and soft decision combining. It is concluded that for optimum fusion, the fusion centre must incorporate signal-to-noise ratio values of cognitive users and the channel conditions. A genetic algorithm-based weighted optimisation strategy is presented for the case of soft decision combining. Numerical results show that the proposed optimised collaborative spectrum sensing schemes give better spectrum sensing performance

NATURAL CONVECTIVE HEAT TRANSFER ANALYSIS NEAR A MOVING INFINITE VERTICAL POROUS PLATE WITH NEWTONIAN HEATING

The natural convective flow due to heat and mass transfer along an impulsively started vertical porous plate has numerous applications in engineering and technology. For example, water filtration in agriculture engineering, distillation, oil cracking, in nuclear reactors, ionization of liquids, etc. In this thesis, the free convection heat and mass transfer flow past an impulsively started infinite vertical porous plate with Newtonian heating is studied

A Probabilistic Stochastic Income Distribution Model of Coal Mining Industry

Coal mining is a profitable enterprise. It creates job opportunities, generates revenue, and attract the foreign investment of a country. However, coal mining faces some challenges. To address the allocation of capital related to coal mining, an approach has been made to improve the impact of coal mining industry on the economy of one of Indonesia most important coal producing region, south Kalimantan. A total of seven households of large-scale and small-scale mining are analyzed in the study. Various copula-based prediction probability models were established, and the exponential distribution function of household income distribution was obtained with maximum range by utilizing the application of Monte Carlo simulation. Moreover, this research spells out the importance of income distribution of various household dynamics which will help the policy maker in economic analysis and financial decisions related to various household categorie

Insights and approaches for low-complexity 5G small-cell base-station design for indoor dense networks

This paper investigates low-complexity approaches to small-cell base-station (SBS) design, suitable for future 5G millimeter-wave (mmWave) indoor deployments. Using large-scale antenna systems and high-bandwidth spectrum, such SBS can theoretically achieve the anticipated future data bandwidth demand of 10000 fold in the next 20 years. We look to exploit small cell distances to simplify SBS design, particularly considering dense indoor installations. We compare theoretical results, based on a link budget analysis, with the system simulation of a densely deployed indoor network using appropriate mmWave channel propagation conditions. The frequency diverse bands of 28 and 72 GHz of the mmWave spectrum are assumed in the analysis. We investigate the performance of low-complexity approaches using a minimal number of antennas at the base station and the user equipment. Using the appropriate power consumption models and the state-of-the-art sub-component power usage, we determine the total power consumption and the energy efficiency of such systems. With mmWave being typified nonline-of-sight communication, we further investigate and propose the use of direct sequence spread spectrum as a means to overcome this, and discuss the use of multipath detection and combining as a suitable mechanism to maximize link reliability

Global Sustainability overview and Role of Policy Instruments for Sustainable Tourism Management in Pakistan

A la indústria turística, la sostenibilitat ha aparegut com a força durant les dues darreres dècades. Ofereix noves orientacions i valors per a les polítiques públiques i indueix a la creació del concepte de turisme sostenible. Sovint, les activitats turístiques creen impactes negatius no només sobre el medi ambient, sinó també sobre la societat, la cultura i, sobretot, sobre l™economia. El turisme és una de les indústries amb més ràpid creixement a tot el món. Junt amb la seva enorme oferta econòmica, rau la complicació de la petjada humana que influeix en la mare naturalesa. Els líders mundials estan dissenyant polítiques ecològiques per contrarestar aquesta preocupació. L™estudi s™ha realitzat a la regió nord del Pakistan. En aquesta investigació, hem exposat els instruments de política relacionats amb els impactes econòmics, socials i ecològics relacionats amb tots els interessats de la indústria turística. Es va fer una anàlisi descriptiva de recerca transversal mitjançant respostes de 304 participants. La majoria dels participants van mostrar resposta positiva davant polítiques i pràctiques ecològiques. No obstant això, s'ha observat una forta confiança en els antecedents sociodemogràfics dels participants, per exemple, gènere, edat, nivell d'educació, mode de vida.Aquest estudi es podria estendre a institucions i universitats més similars de molts altres països, ja que també cal millorar la manera de desenvolupar pràctiques de turisme sostenible. A més, es podria realitzar més investigació per inspeccionar l'impacte del model de desenvolupament turístic sostenible d'altres variables com la satisfacció del turista, el nivell de vida dels residents locals, els hotels i els beneficis dels operadors turístics. Especialment seria més interessant estudiar la satisfacció dels visitants per contribuir a pràctiques turístiques sostenibles i aspectes orientats al cost. Al final, tots els suggeriments i recomanacions podrien actuar com a possibilitat per a acadèmics, governs, responsables polítics i altres parts interessades de dur a terme futures investigacions i desenvolupar altres funcions sostenibles del turisme.En la industria del turismo, la sostenibilidad se ha convertido en una fuerza en las últimas dos décadas. Ofrece nuevas direcciones y valores para las políticas públicas, e induce la creación del concepto de turismo sostenible. A menudo, las actividades turísticas crean impactos negativos no solo en el medio ambiente sino también en la sociedad, la cultura y, sobre todo, en la economía. El turismo es una de las industrias de más rápido crecimiento en todo el mundo. Junto con su oferta económica masiva, se encuentra la complicación de la huella humana que inflige a la madre naturaleza. Los líderes mundiales están elaborando políticas ecológicas para contrarrestar esta preocupación. El estudio se llevó a cabo en la región norte de Pakistán. En esta investigación, hemos exhibido los instrumentos de política que abordan los impactos económicos, sociales y ecológicos relacionados con todos los interesados ​​de la industria del turismo. Se realizó un análisis descriptivo transversal de investigación utilizando las respuestas de 304 participantes. La mayoría de los participantes mostraron una respuesta positiva hacia las políticas y prácticas ecológicas. Sin embargo, se ha observado una fuerte dependencia de los antecedentes sociodemográficos de los participantes, por ejemplo, género, edad, nivel educativo, modo de vida.Este estudio podría extenderse a instituciones y universidades más similares en muchos otros países también, ya que existe la necesidad de mejorar la forma de desarrollar prácticas de turismo sostenible. Además, se podrían realizar más investigaciones para inspeccionar el impacto del modelo de desarrollo del turismo sostenible y otras variables como la satisfacción del turista, el nivel de vida de los residentes locales, las ganancias de los hoteleros y los operadores turísticos. Especialmente, sería más interesante estudiar la satisfacción de los visitantes al contribuir a prácticas de turismo sostenible y aspectos orientados a los costos. Al final, todas las sugerencias y recomendaciones podrían actuar como una posibilidad para que la academia, el gobierno, los encargados de formular políticas y otras partes interesadas realicen investigaciones futuras y desarrollen otras funciones sostenibles del turismo.In the tourism industry, sustainability has emerged as a force in the last two decades. It offers new directions and values for public policy, and induces the creation of the concept of sustainable tourism. Often tourism activities create negative impacts not only on the environment but also on society, culture, and mostly on the economy. Tourism is one of the fastest growing industries around the globe. Along with its massive economic offering, lies the complication of human footprint inflicting the mother-nature. World leaders are devising eco-friendly policies to counter this concern. The study has been carried out in the northern region of Pakistan. In this research, we have exhibited the policy instruments addressing economic, social & ecological impacts related to all stake holders of Tourism Industry. A cross-sectional descriptive research analysis was done using responses of 304 participants. Majority of the participants depicted positive response towards eco-friendly policies and practices. Nevertheless, a strong reliance of sociodemographic background of the participants for example gender, age, education level, mode of livelihood has been observed.This study could be extended to more similar institutions and universities in many other countries also as there is a need to improve the way developing sustainable tourism practices. Also, further research could be conducted to inspect the impact of the sustainable tourism development model other variables such as tourist™s satisfaction, local residents' standard of living, hoteliers' and tourist operators' profit. Especially, studying the satisfaction of visitors in contributing to sustainable tourism practices and cost oriented aspects would be more interesting. In the end, all suggestions and recommendations could act as a possibility for academia, government, policy makers and other stakeholders to carry out future research and develop other sustainable roles of tourism