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Extending SROIQ with Constraint Networks and Grounded Circumscription
Arjun Bhardwaj
Computer Science , 2015,
Abstract: Developments in semantic web technologies have promoted ontological encoding of knowledge from diverse domains. However, modelling many practical domains requires more expressiveness than what the standard description logics (most prominently SROIQ) support. In this paper, we extend the expressive DL SROIQ with constraint networks (resulting in the logic SROIQc) and grounded circumscription (resulting in the logic GC-SROIQ). Applications of constraint modelling include embedding ontologies with temporal or spatial information, while those of grounded circumscription include defeasible inference and closed world reasoning. We describe the syntax and semantics of the logic formed by including constraint modelling constructs in SROIQ, and provide a sound, complete and terminating tableau algorithm for it. We further provide an intuitive algorithm for Grounded Circumscription in SROIQc, which adheres to the general framework of grounded circumscription, and which can be applied to a whole range of expressive logics for which no such specific algorithm presently exists.
GC-SROIQ(C) : Expressive Constraint Modelling and Grounded Circumscription for SROIQ
Arjun Bhardwaj,Sangeetha
Computer Science , 2014,
Abstract: Developments in semantic web technologies have promoted ontological encoding of knowledge from diverse domains. However, modelling many practical domains requires more expressive representations schemes than what the standard description logics(DLs) support. We extend the DL SROIQ with constraint networks and grounded circumscription. Applications of constraint modelling include embedding ontologies with temporal or spatial information, while grounded circumscription allows defeasible inference and closed world reasoning. This paper overcomes restrictions on existing constraint modelling approaches by introducing expressive constructs. Grounded circumscription allows concept and role minimization and is decidable for DL. We provide a general and intuitive algorithm for the framework of grounded circumscription that can be applied to a whole range of logics. We present the resulting logic: GC-SROIQ(C), and describe a tableau decision procedure for it.
Software to Estimate Earthquake Spectral and Source Parameters  [PDF]
Arjun Kumar, Ashwani Kumar, Himanshu Mittal, Ashok Kumar, Rakhi Bhardwaj
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.35116
Abstract: A software (EQK_SRC_PARA) has been developed to estimate spectral parameters of earthquake source spectrum, namely: low frequency displacement spectral level (Ω0), corner frequency above which spectrum decays with a rate of 2 (fc), the cut-off frequency above which the spectrum again decays (fmax) and the rate of decay above fmax (N). A Brune’s source model [1,2] that yield a fall-off of 2 beyond corner frequency is considered with high cut-off frequency factor presented by Boore [3] that fits well for frequencies greater than fmax. The software EQK_SRC_PARA is written in MATLAB and uses input data in Sesame ASCII Format (SAF) format. The obtained spectral parameters have been used to estimate source parameters (e.g., seismic moment, source dimension and stress drop etc.) and to develop scaling laws for the study region. The cut-off frequency “fmax” can also be studied and interpreted to confirm about its origin.
An Intuitive Procedure for Converting PDA to CFG, by Construction of Single State PDA
Arjun Bhardwaj,N. S. Narayanaswamy
Computer Science , 2014,
Abstract: We present here the proof for an alternative procedure to convert a Push Down Automata (PDA) into a Context Free Grammar (CFG). The procedure involves intermediate conversion to a single state PDA. In view of the authors, this conversion is conceptually intuitive and can serve as a teaching aid for the relevant topics.
The Method of Finite Difference Regression  [PDF]
Arjun Banerjee
Open Journal of Statistics (OJS) , 2018, DOI: 10.4236/ojs.2018.81005
Abstract: In this paper I present a novel polynomial regression method called Finite Difference Regression for a uniformly sampled sequence of noisy data points that determines the order of the best fitting polynomial and provides estimates of its coefficients. Unlike classical least-squares polynomial regression methods in the case where the order of the best fitting polynomial is unknown and must be determined from the R2 value of the fit, I show how the t-test from statistics can be combined with the method of finite differences to yield a more sensitive and objective measure of the order of the best fitting polynomial. Furthermore, it is shown how these finite differences used in the determination of the order, can be reemployed to produce excellent estimates of the coefficients of the best fitting polynomial. I show that not only are these coefficients unbiased and consistent, but also that the asymptotic properties of the fit get better with increasing degrees of the fitting polynomial.
Review to EDM by Using Water and Powder-Mixed Dielectric Fluid  [PDF]
Sharanjit Singh, Arvind Bhardwaj
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.102014
Abstract: Basically Electrical discharge machining (EDM) is a well-established non-conventional machining process, used for manufacturing geometrically complex or hard and electrically conductive material parts that are extremely difficult-to-cut by other conventional machining processes. Erosion pulse discharge occurs in a small gap between the work piece and the electrode. This removes the unwanted material from the parent metal through melting and vaporizing in presence of dielectric fluid. Performance measures are different for different materials, process parameters as well as for dielectric fluids. Presence of metal partials in dielectric fluid diverts its properties, which reduces the insulating strength of the dielectric fluid and increases the spark gap between the tool and work piece. As a result, the process becomes more stable and metal removal rate (MRR) and surface finish increases. The EDM process is mainly used for making dies, moulds, parts of aerospace, automotive industry and surgical components etc. This paper reviews the research trends in EDM process by using water and powder mixed dielectric as dielectric fluid.
Wireless Power Transmission with Short and Long Range Using Inductive Coil  [PDF]
Manish Bhardwaj, Anil Ahlawat
Wireless Engineering and Technology (WET) , 2018, DOI: 10.4236/wet.2018.91001
Abstract: In today’s time each individual needs remote framework, yet at the same time control transmission for low power gadgets are wired in nature. Consistent power supply is one of the real issues in the motivation behind the utilization of remote sensor network. Yet, in the power arrangement of remote Sensor Network, the battery has an extremely constrained lifetime and is not supplanted yet by some other persistent power framework. There are separate techniques proposed for shorter and more separate power transmission: Inductive coupling, resonant inductive coupling and air ionization for short separations; microwave and Laser transmission for longer separations. The pioneer of the field, Tesla endeavoured to make a capable, remote electric transmitter more than a century back that has now observed an exponential development. This paper overall lights up all the effective strategies proposed for transmitting power without wires. This study is important for find out the future ways of power transmission. These methods are so important in today’s world because of drastic wastage of power. Common wireless power transmission is a point-to-point control transmission. It was demonstrated that the power transmission effectiveness could approach near 100%.
Universal Health Coverage: Factoring Successful Economies  [PDF]
Prerna Bhasin, Rakesh Bhardwaj
Health (Health) , 2018, DOI: 10.4236/health.2018.107076
Abstract: Countries are seeking to diversify sources of revenue for Universal Health Coverage (UHC), and strategies vary among countries at different stages on the road to UHC. The study tends to document these trade-offs by factoring successful economies across the globe. A review of peer-reviewed literature retrieved country-wise on the basis of successful UHC economies to establish the major factor associated with development of UHC. Political will has been recognized as one of the critical factors. Overcoming barriers associated with development of an adequate and sustainable financing mechanism and selecting the right package of services are other essential determinants. Reaching vulnerable groups and efficient use of resources were other factors that contributed to UHC development in Mexico and south-east Asian countries. UHC development is at threshold where nations should learn from one another, especially from those systems which appear to be doing better, and are more prepared to innovate, test and evaluate new approaches.
Motor grading of elbow flexion – is Medical Research Council grading good enough?
Praveen Bhardwaj, Navin Bhardwaj
Journal of Brachial Plexus and Peripheral Nerve Injury , 2009, DOI: 10.1186/1749-7221-4-3
Abstract: Recovery of elbow flexion is considered as top priority in reconstruction following brachial plexus injury, hence lot of procedures have been described to restore it [1-4]. Nerve transfer is the most preferred method unless the patient presents very late. To assess the recovery of elbow flexion Medical Research Council Grading has been most commonly used worldwide. Serious limitations of MRC grading system have been expressed by many authors [5,6] but it continues to be in use because of its simplicity. Many modifications have been used by various authors [5-9] but none are widely used. We believe that for any grading system to be widely acceptable it need to be a modification of the existing MRC grading system as this has been fed into at least three generations of residents and all are very used to and comfortable using this scale, may be at cost of accuracy. In addition, the grading system has to be comprehensive, easy to use and reproducible.We have been using a modified MRC grading scale to assess the recovery of elbow flexion following nerve transfer in our patients (Table 1). This is a very simple grading system which basically is an elaborated MRC scale. The grade 0 and 1 remains same. Division of Grade 2 & 3 is influenced by the active motion scale described by Curtis et al [9]. Grade 2 has been subdivided into three subdivisions; A, B & C based on the range of motion with gravity eliminated. Grade 3 has been similarly subdivided depending on the range of motion against gravity. The subdivision of Grade 4 is based on the patient's ability to lift the weight through full range of flexion on a biceps curl machine, with weights in 0.5 Kg increments, a commonly used machine in physiotherapy departments and gymnasiums to strengthen the biceps. Grade 4 has three subdivisions; A- if the patient is able to lift less than 30% weight of the normal side; B- if he is able to lift 30–60% weight of the normal side; and C- if he is able to lift more than 60% weight of the
Torcetrapib: A new strategy to raise HDL cholesterol levels
Bhardwaj Reena,Bhardwaj P
Indian Journal of Pharmacology , 2005,
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