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Search Results: 1 - 10 of 2699 matches for " Anil Ada "
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Non-Deterministic Communication Complexity of Regular Languages
Anil Ada
Computer Science , 2008,
Abstract: In this thesis, we study the place of regular languages within the communication complexity setting. In particular, we are interested in the non-deterministic communication complexity of regular languages. We show that a regular language has either O(1) or Omega(log n) non-deterministic complexity. We obtain several linear lower bound results which cover a wide range of regular languages having linear non-deterministic complexity. These lower bound results also imply a result in semigroup theory: we obtain sufficient conditions for not being in the positive variety Pol(Com). To obtain our results, we use algebraic techniques. In the study of regular languages, the algebraic point of view pioneered by Eilenberg (\cite{Eil74}) has led to many interesting results. Viewing a semigroup as a computational device that recognizes languages has proven to be prolific from both semigroup theory and formal languages perspectives. In this thesis, we provide further instances of such mutualism.
Multiparty Communication Complexity of Disjointness
Arkadev Chattopadhyay,Anil Ada
Computer Science , 2008,
Abstract: We obtain a lower bound of n^Omega(1) on the k-party randomized communication complexity of the Disjointness function in the `Number on the Forehead' model of multiparty communication when k is a constant. For k=o(loglog n), the bounds remain super-polylogarithmic i.e. (log n)^omega(1). The previous best lower bound for three players until recently was Omega(log n). Our bound separates the communication complexity classes NP^{CC}_k and BPP^{CC}_k for k=o(loglog n). Furthermore, by the results of Beame, Pitassi and Segerlind \cite{BPS07}, our bound implies proof size lower bounds for tree-like, degree k-1 threshold systems and superpolynomial size lower bounds for Lovasz-Schrijver proofs. Sherstov \cite{She07b} recently developed a novel technique to obtain lower bounds on two-party communication using the approximate polynomial degree of boolean functions. We obtain our results by extending his technique to the multi-party setting using ideas from Chattopadhyay \cite{Cha07}. A similar bound for Disjointness has been recently and independently obtained by Lee and Shraibman.
Spectral Norm of Symmetric Functions
Anil Ada,Omar Fawzi,Hamed Hatami
Computer Science , 2012,
Abstract: The spectral norm of a Boolean function $f:\{0,1\}^n \to \{-1,1\}$ is the sum of the absolute values of its Fourier coefficients. This quantity provides useful upper and lower bounds on the complexity of a function in areas such as learning theory, circuit complexity, and communication complexity. In this paper, we give a combinatorial characterization for the spectral norm of symmetric functions. We show that the logarithm of the spectral norm is of the same order of magnitude as $r(f)\log(n/r(f))$ where $r(f) = \max\{r_0,r_1\}$, and $r_0$ and $r_1$ are the smallest integers less than $n/2$ such that $f(x)$ or $f(x) \cdot parity(x)$ is constant for all $x$ with $\sum x_i \in [r_0, n-r_1]$. We mention some applications to the decision tree and communication complexity of symmetric functions.
Disaster Recovery of Data by Using Data Guard
International Journal of Computer Science and Management Studies , 2012,
Abstract: Oracle Data Guard is the management, monitoring, and automation software infrastructure that creates, maintains, and monitors one or more standby databases to protect enterprise data from failures, disasters, errors, and data corruptions. Data Guard maintains standby databases as consistent copies of the production database as far as transactions are concerned. These standby databases can be located at remote disaster recovery sites thousands of miles away from the production data center, or they may be located in the same city, same campus, or even in the same building. If the production database becomes unavailable because of a planned or an unplanned outage, Data Guard can switch any standby database to the production role, thus minimizing the downtime associated with the outage, andpreventing any data loss. The document explains the structure of a physical standby database with Oracle Data Guard in an SAP environment. It indicates all the steps needed to successfully install and configure an Oracle Data Guard system with a physical standby database and the logical order in which they must be carried out. To enable you to operate the standby database (Oracle DataGuard), a description of how to configure the Data Guard Brokeris also provided. In just a few steps this service allows you toswap the database roles. This means that in the event of a disaster,what is known as a switchover or failover is undertaken almostautomatically. The database administrator can initiate the processwith just one command.
Detection of Blood Traces in Human Pericardial Fluid Using Microwaves  [PDF]
Anil Lonappan
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.210077
Abstract: This communication reports a novel method of analyzing pericardial fluid and finding blood traces present based on the measurement of the dielectric properties at microwave frequencies. The experiment was performed by cavity perturbation method in the S-band of microwave frequency with the pericardial fluid from healthy persons as well as from patients suffering from pericardial bleeding. It is noted that considerable variation in the dielectric properties of patient samples with the normal healthy samples and these measurements were in good agreement with clinical analysis. This measurement technique and the method of extraction of pericardial fluid are simple and both are non invasive. These results give light to an alternative in-vitro method of diagnosing onset pericardial bleeding abnormalities using microwaves without surgical procedure.
Novel Method of Detecting Pregnancy Using Microwaves  [PDF]
Anil Lonappan
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.48047
Abstract: This paper reports a study of the dielectric properties of pregnant women’s blood samples as well non-pregnant women’s blood samples at microwave frequencies. The cavity perturbation technique in the frequency range between 2 and 3 GHz was used in this study. It is observed that the dielectric constant of pregnant women’s blood samples is higher than that of non-pregnant women’s blood samples, and the conductivity of pregnant women’s blood samples is higher than that of non-pregnant women’s blood samples. This is a novel in-vitro method of determining pregnancy. The same samples were also subjected to investigations in the clinical laboratory for quantitative pregnancy blood tests. Determination of pregnancy will help the woman to make preparations for proper prenatal care or family planning.
Novel method of detecting H1N1 using microwaves  [PDF]
Anil Lonappan
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.58060
Abstract: H1N1 virus is a subtype of influenza A virus and was the most common cause of human influenza flu in 2009. This paper presents a new method of detecting H1N1. The dielectric properties respiratory mucus is studied at microwave frequencies using rectangular cavity perturbation technique at the S-band with the different samples of respiratory mucus obtained from healthy donors as well as from patients suffering from H1N1. It is observed that an appreciably variation is found in the dielectric properties of patient samples as that of normal healthy samples and this measurements were in good agreement with the clinical analysis. This measurement technique is quick, simple and suggests a new novel method of diagnosing H1N1 using microwaves.
Novel Method of Detecting Thyroid Disfunction Using Microwaves  [PDF]
Anil Lonappan
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.45029
Abstract: This paper reports a novel method of in-vitro thyroid function analysis based on the measurement of the dielectric properties of blood at microwave frequencies. The measurements were made using rectangular cavity perturbation technique at the S-band of microwave frequency with the different samples obtained from healthy donors as well as from patients. It is observed that an appreciably change in the dielectric properties of patient samples with that of nor-mal healthy samples and this measurements are in good agreement with clinical analysis. These results indicate an al-ternative in-vitro method of diagnosing thyroid abnormalities using microwaves.
Analysis of Tool Wear Rate in Drilling Operation using Scanning Electron Microscope (SEM)  [PDF]
Anil Jindal
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.111004
Abstract: Hole making had long been recognized as the most prominent machining process, requiring specialized techniques to achieve optimum cutting condition. Drilling can be described as a process where a multi-point tool is used to remove unwanted materials to produce a desired hole. It broadly covers those methods used for producing cylindrical holes in the work piece. However, high production machining and drilling with high cutting velocity, feed and depth of cut is inherently associated with generation of large amount of heat and high cutting temperature. Such high cutting temperature not only reduces dimensional accuracy and tool life but also impairs the surface integrity of the product. In this case, high pressure coolant (HPC) is very effective to reduce temperature. When temperature is increased a large amount of tool wear appears at the drill bit. In this situation, high temperature either affects roundness of the hole or chip shape and color of chip. HPC is applied in the same direction as the drill bit. HPC has reduced temperature as well as improving roundness and also provide lubrication in the tool tip and surface interface.
Usability Test of eHealth Promotion @HKIEd—A Community of Practice Platform to Promote Healthy Lifestyles  [PDF]
Wai Wing Ada Ma
Health (Health) , 2016, DOI: 10.4236/health.2016.87064
Abstract: Community of Practice (CoP) has been proved as an effective means for co-creation of knowledge. It is not yet widely used in health promotion, not to mention to utilize technological environment such as Web 2.0 to add value to the CoP. Under this study, an eHealth promotion @HKIEd, a CoP platform to promote healthy lifestyles was designed and constructed. It helped facilitate the CoP to share useful health information, locate expertise, promote health related events, communicate health updates effectively, co-construct shared repertoire of knowledge and build shared best practice on effective health promotion which was not limited to time, space and distance. Usability test was conducted to evaluate user acceptance of the eHealth promotion CoP platform using the Computer System Usability Questionnaire. A random sample of eighty-three active participants was recruited. Fifty females and thirty-three males with mean (S.D.) aged 21.1 were asked to evaluate the e-platform. The average scores of each domain were calculated with the corresponding means of the average scores of System Use, Information Quality and Interface Quality being 2.69, 2.83 and 2.74 respectively. The overall usability was 2.48 and the eHealth promotion @HKIEd demonstrated a high usability. It will provide a promising way to disseminate information for the public in health awareness promotion.
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