9 articles for “Auxiliary variable”

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Research ArticleOpen accessPhrase in the titleADAPTIVE CLUSTER SAMPLING USING AUXILIARY VARIABLENipaporn ChutimanIn this study we study the estimators of the population mean in adaptive cluster sampling by using the information of the auxiliary variable. The estimators in this study are the classical ratio estimator, the ratio estimator using the population coefficient of variation and the coefficient of kurtosis of the auxiliary variable, the regression estimator and the difference estimator. Simulations showed … …Journal of Mathematics and Statistics, Vol. 9, Issue 3 · 4 Sep 2013 · 9,904 accessesView PDF Cite

Research ArticleOpen accessIn the keywordsModified Ratio-Type Estimators of the Mean using Extreme Ranked Set SamplingAmer Ibrahim Al-Omari, Khalifa Jaber, Ahmad Al-OmariModified ratio-type estimators of the population mean were suggested using the first or third quartiles of the auxiliary variable based on Simple Random Sampling (SRS) and Extreme Ranked Set Sampling (ERSS) methods. It was found that, the ERSS was more efficient than the SRS based on the same sample size. Also, the ERSS involving the first quartile was superior to … …Journal of Mathematics and Statistics, Vol. 4, Issue 3 · 30 Sep 2008 · 7,366 accessesView PDF Cite

InvestigationOpen accessIn the abstractSimulation and Experimental Analysis of a Demonstrative Solar Heating and Cooling Plant Installed in Naples (Italy)Annamaria Buonomano, Francesco Calise, Massimo Dentice d'Accadia et al.In this study the model of a Solar Heating and Cooling (SHC) system and its experimental setup are presented. The SHC system under investigation is a demonstration plant installed in Naples, based on flat plate solar collectors and a single-stage LiBr-H2O absorption chiller. In addition, two vertical tanks are installed as storage system. The balance of system includes: A cooling … …American Journal of Engineering and Applied Sciences, Vol. 9, Issue 4 · 10 Oct 2016 · 7,809 accessesView PDF Cite

Research ArticleOpen accessIn the abstractA Novel Prototype of a Small-Scale Solar Power Plant: dynamic Simulation and Thermoeconomic AnalysisAnnamaria Buonomano, Francesco Calise, Maria VicidominiThe paper presents an innovative prototype of a solar power plant, purposely designed for small-scale applications such as residential and/or small commercial buildings. The system consists of 10 kWe Organic Rankine Cycle (ORC) plant and innovative solar thermal collectors. In particular, 235 m2 of flat-plate evacuated solar collectors are designed to heat diathermic oil up to 180°C. A variable volume … …American Journal of Engineering and Applied Sciences, Vol. 9, Issue 4 · 8 Feb 2016 · 8,065 accessesView PDF Cite

Research ArticleOpen accessIn the abstractAPPLYING SEASONAL CLIMATE TRENDS TO AGRICULTURAL PRODUCTION IN TANJUNG KARANG, MALAYSIAMohd Ekhwan Toriman, Lee Qiao Yun, Mohd Khairul Amri Kamarudin et al.The North West Selangor Integrated Agriculture Development Agency (NWS-IADA) is the most productive agricultural part in Selangor, Malaysia. This is partly because of the inherent high fertility of the soils and the moderate variable climate. However, with increasing global concern about climate impacts, this article examines relative importance of climate influences on the paddy production rate over 28 years (1980-2008). … …American Journal of Agricultural and Biological Sciences, Vol. 9, Issue 1 · 6 Jan 2014 · 7,917 accessesView PDF Cite

Research ArticleOpen accessIn the abstractSimulation and Implementation of Quasi Resonant DC-DC ConverterP. Parvathy, N. DevarajanProblem statement: A half-bridge LLC resonant converter with a voltage doubler rectifier has a simple structure and its Zero-Voltage-Switching (ZVS) capability is excellent from zero to full load condition. But conduction loss is more due to high circulating energy thus reducing the system efficiency. Moreover a variable frequency control method makes the control circuits more complicated than those using the … …Journal of Computer Science, Vol. 8, Issue 10 · 29 Aug 2012 · 7,151 accessesView PDF Cite

Research ArticleOpen accessIn the abstractOR-Bridging Fault Identification and Diagnosis for Exclusive-OR Sum of Products Reed-Muller Canonical CircuitsV. Geetha, N. Devarajan, P. N. NeelakantanProblem statement: The faults in digital circuit can be classified broadly as single stuck-atfaults, multiple stuck-ay-faults, stuck-open faults, stuck-on faults, path delay faults, transient faults. Extensive research had been carried out in the field of testing of digital circuits to limit the number of input vectors. The cardinality of the test vectors proposed by many authors was quite high for … …Journal of Computer Science, Vol. 7, Issue 5 · 7 May 2011 · 7,156 accessesView PDF Cite

Research ArticleOpen accessIn the abstractNew Integer Programming Formulations of the Generalized Travelling Salesman ProblemPetrica C. PopThe Generalized Travelling Salesman Problem, denoted by GTSP, is a variant of the classical travelling salesman problem (TSP), in which the nodes of an undirected graph are partitioned into node sets (clusters) and the salesman has to visit exactly one node from every cluster. In this paper we described six distinct formulations of the GTSP as an integer programming. Apart … …American Journal of Applied Sciences, Vol. 4, Issue 11 · 30 Nov 2007 · 7,204 accessesView PDF Cite

Research ArticleOpen accessIn the abstractOn Stability in Multiobjective Integer Linear Programming: A Stochastic ApproachWalied H. Sharif, Omar M. SaadIn this study we consider a multiobjective integer linear stochastic programming problem with individual chance constraints. We assume that there is randomness in the right-hand sides of the constraints only and that the random variables are normally distributed. Some stability notions for such problem are characterized. An auxiliary problem is discussed and an algorithm as well as an illustrative example … …American Journal of Applied Sciences, Vol. 2, Issue 12 · 31 Dec 2005 · 6,712 accessesView PDF Cite