Solving The Low Performance Problem Caused By The Un...

I. INTRODUCTION In this article, the authors proposed to use a new technique – â€Å"resource bricolage† to solve the low performance problem caused by the un-balanced workloads in parallel database systems. When a parallel database system is first constructed, the set of machines are made identical, therefore, the default data partitioning strategy for this parallel database is uniform data partitioning, and will ignore the differences among machines. In this case, all these identical machines will have the same workload, which will end up with similar performance efficiency. However, when time goes by, in this parallel database system, new machines that are different from the original ones will be added; old machines will be reconfigured/upgraded or replaced. These changes will result in a heterogeneous parallel database (the set of machines varies a lot from each other, such as having different disk, CPU, memory and network resources). When this happens, the default uniform data partitioning method will still allocate data evenly onto each machine. Due to the heterogeneous feature of each machine, the same amount of data will be processed with varying amounts of time: same workload ma y overload the slow machines and under-utilize the powerful machine. Based on the fact that the slowest machine will determine the processing time in a parallel database system, the situation, described above, will significantly harm the overall database performance and at the same time, wasteShow MoreRelatedOperational Risk Management50825 Words   |  204 PagesDepending on the size and complexity of a bank, the response to operational risks may require considerable changes, such as the adaptation of systems and processes as well as, above all, the further development and integration of risk management methods. 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Aa Recovery Meeting At Club Soda - 989 Words

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Light Pollution An Earthquake Shook Los Angeles

Joel Barnett Claudia Moura Pols 1 Dec 1, 2014 Light Pollution In 1994, an earthquake shook Los Angeles, knocking out its power and leaving its inhabitants stranded in darkness. In the hours that followed the blackout, many anxious residents called local emergency centers to report seeing a strange â€Å"giant, silvery cloud† in the dark sky. According to Terence Dickinson in his book Nightwatch: A Practical Guide to Viewing the Universe, some people even believed a â€Å"sudden brightening of the stars. . . had caused the quake.† It turns out that what the majority of Los Angeles was seeing for the first time was actually the Milky Way. In little over 100 years since Thomas Edison’s incandescent light bulb first illuminated a New York street, an†¦show more content†¦Nocturnal animals or animals that breed nocturnally are also adversely affected by manmade light. When young sea turtles hatch, they generally emerge from their sandy beach-shore nests at night, which increases their odds of avoiding detection by predat ors. As soon as they are out of their nest, they find the brightest horizon, and rush towards it. A CBS news article points out, â€Å"That should be moonlight over the ocean. Instead, many end up racing in the opposite direction, towards the headlights of cars and illuminated porches of beachfront homes.† Unfortunately, these misguided turtles are quickly killed by shore birds or dehydration. For a species that has a one in 1000 chance of reaching adulthood, light pollution is playing a major role in eliminating their existence. Even if sea turtle survival or stargazing isn’t high on our priority list, light pollution should still concern us. As humans, we are dependent on visual cues, so illumination of our nightscapes seems comfortable and necessary. However, unnatural nighttime lighting affects our circadian rhythm, or 24 hour day/night pattern. According to a 2009 Environmental Health Perspective article on the dangers of light pollution, â€Å"Disruption of the circadian clock is linked to several medical disorders in humans, including depression, insomnia, cardiovascularShow MoreRelatedIgbo Dictionary129408 Words   |  518 Pagesbegan as an attempt to determine more exactly the dialect of Abrahams material and hence the dialect in which the work could most profitably be continued. This work re-emphasizes the complex phonology of the southern Igbo dialects, already brought to light in the work of Carnochan (1948), Swift and others (1962), and Green and Igwe (1963) It will be seen that a common theme running through much of the work here surveyed is a pre-occupation with the dialect problem. Only the work of Abraham and WelmersRead MoreOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 Pageswater, and air of the planetary environment. From multinational corporations to impoverished peasants burning away the rain forest for land to plant their crops or pasture their cattle, he seeks to identify the specific agents responsible for both pollution and ecological degradation. And he tracks underlying trends and factors—such as rapid population growth, rampant consumerism, and global warfare—that have contributed to global climate change. Tucker concludes his rather pessimistic assessmentRead MoreInternational Management67196 Words   |  269 Pages At the end of each chapter, there is a pedagogical feature that recapitulates the chapter’s subject matter: â€Å"The World of International Management—Revisited.† Here we pose several discussion questions based on the topic of the opening feature in light of the student’s entire reading of the chapter. Answering these questions requires readers to reconsider and to draw from the chapter material. Suggested answers to these â€Å"WIM—Revisited† discussion questions appear in the completely updated Instructor’s

John Dalton and Atomic Theory Outline and Sources free essay sample

This is the general path to his discoveries. However, no one knows specifically how he reached most of his conclusions about atoms. II. Work on the atom and its contribution to the modern atomic model A. Lavoisier’s Law influenced Dalton’s assertion that atoms cannot be created, destroyed, or subdivided. B. Proust’s Law of Definite Proportions led Dalton to his Law of Multiple Proportions C. He was trying to explain why water absorbs different gases in different proportions. D. Contributions 1. All matter consists of tiny particles, atoms. 2. Atoms cannot be created, destroyed, separated into smaller parts or transformed into another element. 3. All atoms of the same element have identical weights, while atoms of different elements have different weights. 4. When elements react, their atoms combine in simple, whole-number ratios. 5. When elements react, their atoms sometimes combine in more than one simple, whole-number ratio. 6. When atoms combine in only one ratio, they are combining in a 1:1 ratio. We will write a custom essay sample on John Dalton and Atomic Theory Outline and Sources or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page III. Contributions which were eventually disproven and thus are not part of the modern model A. The idea that atoms that combine in only one ratio do so in a 1:1 ratio not only led him to wrong conclusions, but also caused his theory to be rejected for many years. B. Another mistaken idea was that atoms cannot be separated into smaller parts or transformed into another element. C. The assertion that all atoms of the same element have identical weights, while atoms of different elements have different weights is inaccurate. IV. Conclusion A. His work was important and foundational to modern atomic model. Sources [1] John Dalton (British Scientist): Atomic Theory. Encyclopedia Britannica Online. Encyclopedia Britannica, n. d. Web. 5 Feb. 2013. . [2] Lefers, Mark, and Holmgren Lab. Northwestern University/Morimoto Laboratory-Definitions. Online Posting. Morimoto Laboratory. Northwestern University, 26 July 2004. Web. 5 Feb. 2013. . [3] John Dalton Biography. Bio. com. AE Networks Television, n. d. Web. 5 Feb. 2013. . [4] Senese, Fred. Foundations of Daltons Atomic Theory. Gener al Chemistry Online: Companion Notes: Atoms Ions: Daltons Atomic Theory: Daltons Postulates. N. p. , 25 July 2005. Web. 5 Feb. 2013. .