dCACH: Content Aware Clustered and Hierarchical Distributed Deduplication

Authors: Girum Dagnaw, Ke Zhouorcid, Hua Wangorcid

In deduplication, index-lookup disk bottleneck is a major obstacle which limits the throughput of backup processes. One way to minimize the effect of this issue and boost speed is to use very high course-grained chunks for deduplication at a cost of low storage saving and limited scalability. Another way is to distribute the deduplication process among multiple nodes but this approach introduces storage node island effect and also incurs high communication cost. In this paper, we explore dCACH, a content-aware clustered and hierarchical deduplication system, which implements a hybrid of inline course grained and offline fine-grained distributed deduplication where routing decisions are made for a set of files instead of single files. It utilizes bloom filters for detecting similarity between a data stream and previous data streams and performs stateful routing which solves the storage node island problem. Moreover, it exploits the negligibly small amount of content shared among chunks from different file types to create groups of files and deduplicate each group in their own fingerprint index space. It implements hierarchical deduplication to reduce the size of fingerprint indexes at the global level, where only files and big sized segments are deduplicated. Locality is created and exploited first using the big sized segments deduplicated at the global level and second by routing a set of consecutive files together to one storage node. Furthermore, the use of bloom filter for similarity detection between streams has low communication and computation cost while it enables to achieve duplicate elimination performance comparable to single node deduplication. dCACH is evaluated using a prototype deployed on a server environment distributed over four separate machines. It is shown to have 10× the speed of Extreme_Binn with a minimal communication overhead, while its duplicate elimination effectiveness is on a par with a single node deduplication system.


Journal: Journal of Software Engineering and Applications
DOI: 10.4236/jsea.2019.1211029(PDF)
Paper Id: 96634 (metadata)

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Association between Children’s Saving Account and Parent Rated Children’s Health: A Preliminary Study

Authors: Anao Zhang, Zibei Chen, Kaipeng Wang, William Elliott, So’phelia Morrow

Children’s Savings Accounts (CSAs) are interventions designed to build educational assets for school-age children. The positive effects of having a CSA has been established for mental health and developmental outcomes, yet no studies to date have examined how CSAs affect children’s physical health. This study uses data from Harold Alfond College Challenge, the oldest and one of the most well-known CSA programs in the United States, to evaluate the association between a CSA and children’s physical health status measured by parent-rated children’s health. Results indicate CSA ownership is associated with a greater chance of reporting excellent or very good health than those families who did not receive a CSA. Implications on research and CSA programs are discussed.


Journal: Sociology Mind
DOI: 10.4236/sm.2020.101001(PDF)
Paper Id: 96568 (metadata)

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Creativity on Icon Design of Mobile Apps

Author: Kungpo Tao

The icon design of mobile APPs could have a crucial effect on success of businesses since the initial contact with a business or service relies on the visual evaluation on the icons. It seems to be a challenge for designers to incorporate all the information within a tiny space of an icon, not to mention how making it attracted. Creativity has thus played its role in winning the game in the market of mobile APPs. Taking advantage of aesthetics, creativity not only makes a product more appealed but saleable in the markets. Similar to product design, icon design requires not only visual aesthetics, but all creative imperatives. In the competitive market, the fact is that there are only a few mobile APPs that have received awareness and survived every year since new product design with visual aesthetics and creativity is not without difficulty. It is the aim of the present research to examine the key factors of graphic design and the effect of creativity on the popularity of mobile APPs across different categories. The research intends to inspect the mobile APP’s key characteristics and visualization. Theoretically, the research contributes to the mobile APPs literature through its findings on dimensional analysis and its relationships with creativity. In addition, results of the research provide useful insights into how companies or services adopt a strategic tactics to make their icon symbols more creative in the market of mobile APPs.


Journal: Theoretical Economics Letters
DOI: 10.4236/tel.2019.98173

Paper Id: 96557 (metadata)

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Influence of Cleaning Time in Household Reservoirs on Trihalomethane Formation in Treated Water

Authors: Ricardo Andreola, Péricles Martim Reche, Gervasio Tono,
Graciene de Souza Bido, Daniele Fernanda Felipe, Anny Rosi Mannigel,
André Ribeiro da Costa, Gisele Caroline Novakowski, Letycia Lopes Ricardo,
Flavia Helena de Moura Liborio, Stephane Raquel Almeida Velande da Fonseca,
Isabela Silva de Oliveira, Giuliano Patrick Rasera, Thaise Moser Teixeira

Chlorination is an efficient and low-cost technique in disinfecting water for public water supply. However, during the process, the formation of undesirable by-products called halogen compounds, such as trihalome-thanes (THMs), occurs. Some of these compounds are proven to be carcinogenic to laboratory animals. The goal of this study was to investigate the occurrence of THMs in household reservoirs and the influence of cleaning time of these reservoirs on the formation of THMs. A total of 103 households were investigated in the city of Maringá, State of Paraná, Brazil. The residences were classified according to the cleaning time of the reservoir into: up to one year, one to two years and more than two years. Samples were taken from the reservoirs and total trihalomethanes (THMt) were analyzed by gas chromatography (GC-MS), total organic carbon (TOC) by means of a Hach kit for low concentrations and free residual chlorine (CLres) by means of a kit for in loco determination. According to the results, the highest concentrations of THMt were observed in the reservoirs with cleaning time of more than 2 years. However, no amount has exceeded the maximum limit allowed by law. In general, the longer the time for cleaning the reservoir, the greater the degradation of water quality in THMt.


Journal: Journal of Water Resource and Protection
DOI: 10.4236/jwarp.2019.1111080(PDF)
Paper Id: 96531 (metadata)

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Influencing Factors on Tourists’ Purchase Intention for Intangible Cultural Heritage Souvenir: A Case of Wangkui Shadow Souvenir

Authors: Haiying Liu, Chanchai Bunchapatanasakda, Chuantong Zhang, Shujuan Zhao, Dan Wang

Souvenir purchase has been considered as an important component of tourism, so it is necessary to understand the purchase intention and its antecedents. The research examined the influence of hedonic value, perceived problem, utilitarian value, customer satisfaction, attitude of protection and development on purchase intention. This research conducted an empirical study on one of intangible cultural heritage souvenirs, Wangkui shadow souvenirs. Selection of the sample was done by using purposive sampling with one criterion: the tourists who had travelled in Wangkui city. Data were collected by using questionnaires and 500 tourists participated in this study. The data were analyzed by using Structural Equation Modeling (SEM) with Amos computer program. The findings showed that hedonic value, utilitarian value had significant positive effect on customer satisfaction; customer satisfaction had a significant positive effect on purchase intention; hedonic value, utilitarian value had significant positive effect on attitude of protection and development; attitude of protection and development had a significant positive effect on the purchase intention; perceived problem had no significant positive effect on customer satisfaction and attitude of protection and development, but it had a significant negative effect on purchase intention.


Journal: Modern Economy
DOI: 10.4236/me.2019.1011142

Paper Id: 96511 (metadata)

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Fundamental Mechanism of Slow Crack Growth in Semi-Crystalline Polymers under a Constant Load

Author: Norman Brown

The purpose is to quantitatively present in a single equation all the factors that affect the failure time by Slow Crack Growth (SCG) in a semi-crystalline polymer (SCP) under a constant load. The fundamental mechanism of fracture is displayed at the molecular level. The rate of fracturing is determined by the Eyring theory of thermal activation. The resulting equation includes the important molecular properties of therein, the length and density of the tie molecules. The underlying microfracture process is the unfolding of the chains in the crystal under the action of the tie molecules.


Journal: Materials Sciences and Applications
DOI: 10.4236/msa.2019.1011052(PDF)
Paper Id: 96451 (metadata)

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Metasediments in the Alahina Sector and Associated Mineralization (North-Eastern Guinea)

Authors: Koffi Germain Tchokpon, Christophe Kaki, Glodji Luc Adissin,
Soulémana Yessoufou, Mory Kourouma

The Alahina sector is located in the North-East of Guinea, precisely in the Siguiri volcano-sedimentary basin. It consists mainly of meta-sediments traversed by Paleoproterozoic pyroclastite, granite, monzogranite and granodiorite veins as well as Mesozoic dolerite and gabbros veins. This article presents new data, on the one hand, on the geochemical petrographic features and the origin of the metasediments of this zone, and on the other hand, on the genetic model of the gold mineralization that they contain. Field observations, as well as petrographic and geochemical studies reveal that the meta-sediments consist of sericite and chlorite schists. They belong to the groups of shales and grauwackes. Their protholites are moderately altered (60 < CIA < 80) andesitic, basaltic and granodioritic rocks emplaced in a geotectonic oceanic island arc and/or active continental margin. Their chondrite normalized REE patterns show a moderate LREE enrichment (LaN/YbN = 6.31 – 13.24) and a flat heavy rare earth patterns (HREE). This spectrum is almost identical to those of the “Post-Archean average Australian Shale” and Early Proterozoic Greywackes. Two types of polyphase gold mineralization occur in the Alahina sector: disseminated and veined. They consist of particular of grains and nanoparticles pyrite associated with gold, magnetite, hematite, ilmenite. The hydrothermal alteration accompanying this mineralization consists of silica, microcline, chlorite-epidote-sericite-carbonates.


Journal: Open Journal of Geology
DOI: 10.4236/ojg.2019.912097(PDF)
Paper Id: 96445 (metadata)

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The History of Tuberculosis: Past, Present, and Future

Authors: Rohan Prabhu, Vinodkumar Singh

Tuberculosis (TB), transmitted by the bacteria Mycobacterium tuberculosis has been a global epidemic for years. The evidence for infection with TB is centuries old. It can have an indolent course, and may remain inactive for years in individuals with the possibility of reactivation at any time, causing widespread systemic symptoms. The treatment and management of TB has become more effective over the years. It is estimated that more than one-third of the world population, especially in poor and developing countries are harboring this bacterium with varying manifestations of the disease from no symptoms to life-threatening infections. This manuscript describes the history of the disease and the discoveries. It also includes the recent advances and challenges facing the world and how governments and organizations are working together to control this disease.


Journal: Advances in Microbiology
DOI: 10.4236/aim.2019.911059(PDF)
Paper Id: 96406 (metadata)

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Process of Psychological Growth Associated with the Experience of the Yips Using the Trajectory Equifinality Model

Authors: Matsuda Kojiro, Susaki Yasuo, Mukai Kosuke, Yoshio Sugiyama

The purpose of this study was to explore the process of positive psychological changes (i.e., psychological growth) with the experience of the yips using qualitative research methods, focusing on positive aspects among the psychological changes with the experience of the yips. We interviewed one baseball player who had experienced the yips in the past and gained data on the psychological growth associated with the yips experience and what is believed to be involved in it. We then used Trajectory Equifinality Model to analyze the data obtained from the interviews. The analysis yielded four categories of psychological growth with the experience of the yips. These results suggest that “psychological conflict and struggle following the experience of the yips”, “intentional and active meaning-making with regard to the yips and throwing”, “social support” and “overcoming the yips” play important roles in their psychological growth.


Journal: Psychology
DOI: 10.4236/psych.2019.1014122(PDF)
Paper Id: 96401 (metadata)

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An Adaptive EMD Technique for Induction Motor Fault Detection

Authors: Manzar Mahmud, Wilson Wang

Reliable induction motor (IM) fault detection techniques are very useful in industries to diagnose IM defects and improve operational performance. An adaptive empirical mode decomposition (EMD) technology is proposed in this paper for rotor bar fault detection in IMs. As the characteristic fault frequency will change with operating conditions related to load and speed, the proposed adaptive EMD technique correlates fault features over different frequency bands and intrinsic mode function (IMF) sidebands. The adaptive EMD technique uses the first IMF to detect the fault type and the second IMF as an indicator to predict the fault severity. It can overcome the problems of the sensitivity of sideband frequencies related to the speed and load oscillations. The effectiveness of the proposed adaptive EMD technique is verified by experimental tests under different motor conditions.


Journal: Journal of Signal and Information Processing
DOI: 10.4236/jsip.2019.104008(PDF)
Paper Id: 96353 (metadata)

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