129 articles for “Time Trend”

Research ArticleOpen accessAll words, across the recordThe Wear of Tunnel Boring Machine Excavation Tools in RockClaudio Oggeri, Pierpaolo OresteSome of the most important aspects in the study of the fragmentation of rock due to the action of TBM disks concern the abrasiveness of the rock and the wear of the tools. The wear of the disks in fact means that they have to be substituted, with consequent effects on the efficiency of the excavation, on the speed of … …American Journal of Applied Sciences, Vol. 9, Issue 10 · 16 Aug 2012 · 7,662 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordBayesian Changepoint Analysis of the Extreme Rainfall EventsWan Zawiah Wan Zin, Abdul Aziz Jemain, Kamarulzaman IbrahimProblem statement: This study assesses recent changes in extremes of annual rainfall in Peninsular Malaysia based on daily rainfall data for 50 rain-gauged stations over the period 1975-2004. Approach: Eight indices that represent the extreme events are defined and analyzed, which are extreme Dry Spell (XDS), extreme Rain-Sum (XRS), extreme wet-day intensities at 95% and 99% percentiles (I95 and I99), … …Journal of Mathematics and Statistics, Vol. 8, Issue 1 · 6 Feb 2012 · 7,255 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordVariation of Surface Ozone Recorded at the Eastern Coastal Region of the Malaysian PeninsulaAida Shafawati Ismail, Mohd Talib Latif, Siti Zawiyah Azmi et al.Problem statement: Variations of ozone (O3) concentrations in the Eastern Coastal Region of the Malaysia peninsula were investigated using data obtained from the Malaysian Department of the Environment. The aim of this study was to determine the monthly and seasonal variations of ozone concentrations at all monitoring sites. This study deals with the air quality data recorded at four air … …American Journal of Environmental Sciences, Vol. 6, Issue 6 · 31 Dec 2010 · 8,075 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordOrigin and Trend of Distance Education in UgandaBbuye Juliana, Mango M. JohnDistance education has been in existence in Uganda since the 1960s, and it has grown steadily since that time. It is however a neglected area in terms of data collection and research. The courses that were running between 1960 and 1980s have scanty documentation. What can be traced include the upgrading course for teachers which upgraded 1000 teachers from vernacular … …Journal of Social Sciences, Vol. 1, Issue 3 · 30 Sep 2005 · 7,150 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordApplication of Bi-Directional Grid Constrained Stochastic Processes to Algorithmic TradingAldo Taranto, Shahjahan KhanBi-directional Grid Constrained (BGC) Stochastic Processes (BGCSP) become more constrained the further they drift away from the origin or time axis are examined here. As they drift further away from the time axis, then the greater the likelihood of stopping, as if by two hidden reflective barriers. The theory of BGCSP is applied to a trading environment in which long … …Journal of Mathematics and Statistics, Vol. 17, Issue 1 · 6 Mar 2021 · 8,533 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordAn On-line Analytical Processing (OLAP) Aggregation Function for Rising Aspects in Collaboration and Social NetworksWaqas Nawaz, Kifayat Ullah Khan, Muhammad Shoaib SiddiquiThe overwhelming usage of social and collaboration networks provides the opportunity to analyze evolution of relationships among individuals, like celebrities or co-authors. Discovering such phenomenon in large complex networks is non-trivial due to their large sizes. In this situation, the aggregation functions used in OLAP, are useful to analyze the summarized data. OLAP has successfully proven its worth on multidimensional … …Journal of Computer Science, Vol. 16, Issue 6 · 10 Jun 2020 · 7,124 accessesView PDF Cite

Review ArticleOpen accessAll words, across the recordProcessing Skyline Queries in Incomplete Database: Issues, Challenges and Future TrendsYonis Gulzar, Ali A. Alwan, Norsaremah Salleh, Imad Fakhri Al ShaikhliIn many contemporary database applications such as multi-criteria decision-making and real-time decision-support applications, data mining, e-commerce and recommendation systems, users need query operators to process the data aiming at finding the results that best fit with their preferences. Skyline queries are one of the most predominant query operators that privileges to find the query results that return only those data … …Journal of Computer Science, Vol. 13, Issue 11 · 20 Nov 2017 · 8,009 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordTHE SCADA REVIEW: SYSTEM COMPONENTS, ARCHITECTURE, PROTOCOLS AND FUTURE SECURITY TRENDSA. Shahzad, S. Musa, A. Aborujilah, M. IrfanThe Supervisory Control and Data Acquisition (SCADA) system has prominent place and play important roles within real time industrial communication included &#34electric stations, oil stations and water purification plants&#34. In this study; the SCADA System main components, architecture and important protocols, which have been used in SCADA message transmission are reviewed. After review, the current research changes the direction (Section: … …American Journal of Applied Sciences, Vol. 11, Issue 8 · 27 Jun 2014 · 9,089 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordApplication of Markov Chains to Stock TrendsKevin J. Doubleday, Julius N. EsungeProblem statement: Modeling of the Dow Jones Industrial Average is frequently attempted in order to determine trading strategies with maximum payoff. Changes in the DJIA are important since movements may affect both individuals and corporations profoundly. Previous work showed that modeling a market as a random walk was valid and that a market may be viewed as having the Markov … …Journal of Mathematics and Statistics, Vol. 7, Issue 2 · 18 May 2011 · 8,564 accessesView PDF Cite