CHANDRA SHARMA - Academia.edu (original) (raw)

Papers by CHANDRA SHARMA

ICC 2021 - IEEE International Conference on Communications

Due to the recent popularity of online social networks, coupled with people's propensity to discl... more Due to the recent popularity of online social networks, coupled with people's propensity to disclose personal information in an effort to achieve certain gratifications, the problem of navigating the tradeoff between privacy and utility attracted a lot of recent interest and generated a rich body of research. A critical prerequisite to solving the problem is to appropriately capture the privacy and the utility aspects in the problem formulation. Most of the existing works' focus is on the notion of privacy, while utility loss is often treated as the undesirable but necessary distortion of the true data, introduced by the privacy mechanism. By contrast, we are interested in modelling utility differently, by associating it with specific attributes of a user, just like privacy is associated with specific private attributes in the literature. Our model of utility facilitates a better and more precise privacy mechanism, and achieves better privacy-utility tradeoffs. We further incorporate into our problem formulation a practical constraint on acceptable loss in utility per unit gain in privacy, which allows users to customize the privacy mechanisms in order to account for the relative values that each user associates with their own privacy and utility. This paper discusses the intricacies of our utility model and the corresponding privacy-utility tradeoff, and introduces a heuristic greedy algorithm to solve the problem.

International journal of ecology and environmental sciences, Oct 13, 2020

IEEE Access, 2021

Advanced electronic units inside modern vehicles have enhanced the driving experience, but also i... more Advanced electronic units inside modern vehicles have enhanced the driving experience, but also introduced a myriad of security problems due to the inherent limitations of the internal communication protocol. In the last two decades, a number of security threats have been identified and accordingly, security measures have been proposed. While a large body of research on the vehicular security domain is focused on exposing vulnerabilities and proposing counter measures, there is an apparent paucity of research aimed at reviewing existing works on automotive security and at extracting insights. This paper provides a systematic review of security threats and countermeasures for the ubiquitous CAN bus communication protocol. It further exposes the limitations of the existing security measures, and discusses a seeminglyoverlooked, simple, cost-effective and incrementally deployable solution which can provide a reasonable defense against a major class of packet injection attacks and many denial of service attacks.

ArXiv, 2019

The advanced electronic units with wireless capabilities inside modern vehicles have, enhanced th... more The advanced electronic units with wireless capabilities inside modern vehicles have, enhanced the driving experience, but also introduced a myriad of security problems due to the inherent limitations of the internal communication protocol. In the last two decades, a number of security threats have been identified and accordingly, security measures have been proposed. In this paper, we provide a comprehensive review of security threats and countermeasures for the ubiquitous CAN bus communication protocol. Our review of the existing literature leads us to a observation of an overlooked simple, cost-effective, and incrementally deployable solution. Essentially, a reverse firewall, referred to in this paper as an icewall, can be an effective defense against a major class of packet-injection attacks and many denial of service attacks. We cover the fundamentals of the icewall in this paper. Further, by introducing the notion of human-in-the-loop, we discuss the subtle implications to its...

Small forest fragments are common in the landscape of Assam. These have conservation value as the... more Small forest fragments are common in the landscape of Assam. These have conservation value as they provide habitat for wildlife and maintain connectivity between large habitats. Moreover these areas are support system for various floral biodiversity. But the rules of protected forest do not apply in these tree clad areas as the people living in and around these historically maintained their livelihoods depending on various forest products, through timber and non-timber forest products. In present study an attempt has been made to exploit the importance of forests outside reserved forest and detect the green cover change of Dimoria Developmetal Block of Kamrup (M) District of Assam using RS and GIS techniques. Unsupervised and Supervised classification method of image classification was adopted for generating green cover change. The results show that there is a considerable decline in green cover from 1999-2013 and the decline value is about 11 percent. This enhances in increasing no...

2021 IEEE 4th 5G World Forum (5GWF), 2021

Mobile network architectures and standards have evolved over a period of time. However, to improv... more Mobile network architectures and standards have evolved over a period of time. However, to improve the average revenue per user (ARPU), an efficient and simplified network architecture is needed. Network designers and operators are working towards an optimized network architecture and a simplified 5G deployment framework. In this paper, we present our approach towards the logical evolution of the next-generation 5G network from the perspective of access, core networks, and data analytics convergence for effective traffic steering and moving towards enterprise-focused private 5G deployment models. As a step forward, we propose novel mechanism on how a user can switch between different types of access technologies (Wi-Fi, LoRA-WAN, 5G, SatCom, etc.) and how convergence of analytics can help achieve end-to-end use case optimization.

Engineering, Technology & Applied Science Research, 2012

Graphene-supported (40-x) wt% Pd x wt% Co (0≤x≤13.33) alloys/composites have been prepared by a m... more Graphene-supported (40-x) wt% Pd x wt% Co (0≤x≤13.33) alloys/composites have been prepared by a microwave-assisted polyol reduction method and been investigated for their structural and electrocatalytic properties for the oxygen reduction reaction (ORR) in 0.5 M H2SO4 at 298 K. The study demonstrated that the bimetallic Pd-Co composite nanoparticles are, in fact, alloy nanoparticles with fcc crystalline structure. Partial substitution of Pd by Co (from 3.64 to 13.33 wt%) in 40 wt% Pd/graphene decreases the lattice parameter as well as the crystallite size and increases the apparent catalytic activity, the latter, however, being the greatest with 8 wt% Co. The ORR activity of the active 32 wt% Pd 8wt% Co is found to be considerably low when it was deposited on the support multiwall carbon nanotubes under similar conditions. The rotating disk electrode study indicated that the ORR on 32 wt% Pd 8 wt% Co/GNS in 0.5 M H2SO4 follows approximately the four-electron pathway.

Indian Journal of Health Sciences and Biomedical Research (KLEU), 2017

Although some pathologies like demyelination have predilection for middle cerebellar peduncles (M... more Although some pathologies like demyelination have predilection for middle cerebellar peduncles (MCPs), infarction of bilateral MCP simultaneously is an exceedingly rare presentation of stroke. Patient was a 70-year-old smoker and hypertensive male presented with acute onset vertigo, imbalance while walking and slurred speech for 2 days and examination revealed horizontal nystagmus bilaterally, scanning speech with cerebellar signs and Modified Rankin Score (MRS) of 3. Magnetic resonance imaging brain showed symmetrical areas of diffusion restriction in both MCP, and there was occlusion of bilateral vertebral arteries (partial occlusion of right and complete occlusion of left) and basilar artery in computed tomography angiography. Oral antiplatelet with antihypertensive medication was started along with gait training and speech therapy. Patient had gradual and significant recovery and his MRS improved to 2 after 3 months' follow-up. Hypoperfusion along with atherothrombotic occlusion of vessels can be probable explanation to the bilateral infarction in MCPs which forms important watershed zone in posterior circulation of the brain.

World journal of surgical oncology, Jan 13, 2005

Breast cancer is the second most common malignancy among women, next to cervix cancer. Understand... more Breast cancer is the second most common malignancy among women, next to cervix cancer. Understanding its pathogenesis, morphological features and various risk-factors, including family history holds a great promise for the treatment, early detection and prevention of this cancer. In an attempt to evaluate the clinico-morphological patterns of breast cancer patients, including their family history of breast and/or other cancers, a detailed analysis of 569 breast cancer cases diagnosed during the years 1989-2003 was carried out. Mean and standard deviation and Odds ratios along with 95% confidence intervals were estimated. Chi2/Fisher's exact test were employed to test for proportions. Mean age of the patient at presentation was 47.8 years, ranging from 13-82 years. Among the various histo-morphological types, Infiltrating duct carcinoma (IDC) was found to be commonest type i.e. in 502 cases (88.2%), followed by infiltrating lobular carcinoma (ILC) in 21 cases (3.7%) and other typ...

Journal of Medical Society, 2013

ABSTRACT Objective: To determine the spectrum of various bone tumors and their relative frequency... more ABSTRACT Objective: To determine the spectrum of various bone tumors and their relative frequency at Regional Institute of Medical Sciences (RIMS) Hospital. Materials and Methods: A retrospective review of histopathological reports of all bone specimens received in the Department of Pathology (histopathology section), RIMS hospital for a period of 2 years from January 2009‑December 2011 was done. Results: Of the 98 histopathologically diagnosed bone lesions, 50 (51%) were males and 48 (49%) were females, with a male to female ratio of 1.04:1. Age ranged from 7‑74 years. Nonneoplastic lesions accounted for 36.7%, while neoplastic lesions accounted for 63.3%. Osteomyelitis was the most common and only nonneoplastic lesion encountered with 36 cases (36.7%). Out of 62 cases of bone tumors, benign tumors made up to 66.01%, while the malignant tumor and tumor‑like lesions made up 17.71 and 16.2%, respectively. Age ranged from 8‑74 years, in which 34 (55%) were males and 28 (45%) were females with M:F ratio of 1.2:1. Osteochondroma with 22 cases (35.2%) and osteosarcoma with seven cases (11.27%) were the most common benign and malignant tumors, respectively; while fibrous dysplasia with five cases (8.05%) was the most common tumor‑like lesion. The age peak incidence was in the 2 nd (43.55%) and 3 rd (32.2%) decades. Femur was the most common site with 19 (30.6%) occurrences followed by tibia with 18 (29%). Conclusion: Chronic osteomyelitis was the commonest nonneoplastic lesion. Among the bone tumors, osteochondroma and osteosarcoma was the most common benign and malignant bone tumor, respectively.

Handbook of Intelligent Scaffold for Tissue Engineering and Regenerative Medicine, 2012

The Electronic Library, 1994

This paper suggests a standard format for creating hypermedia software. Teachers and students of ... more This paper suggests a standard format for creating hypermedia software. Teachers and students of literature have taken up the use of hypermedia technology enthusiastically and so we are rapidly arriving at a situation where a mushrooming of software for language and literature teaching will be faced. We will arrive much sooner at a situation where searching for an appropriate software would be as difficult as finding an appropriate article today. Technology is expected to optimise information to maximise knowledge: the confusion created by Gutenburg's invention is because duplication cannot be avoided. The suggested format is based on the major pillars of literary criticism — author centred, text centred and reader centred—and develops from the word to the work level. The findings have been demonstrated in the form of Technocriticism, a hypermedia program created on HyperCard.

Journal of Religion & Health, 1992

Pastors&amp;#39; children have been thought to have more behavioral problems than other c... more Pastors&amp;#39; children have been thought to have more behavioral problems than other children since they face high expectations and are part of families that are often under public scrutiny. The purpose of this study was to describe the social competencies and behavioral problems of a national sample of pastors&amp;#39; children, aged 4-16, and to compare them to age and sex standardized norms. Data were obtained on 98 children from a random sample of 62 families, using the Child Behavior Checklist. Results indicate that scores for both boys and girls at each age grouping fell within the acceptable norms for both social competencies and behavioral problems.

Early Child Development and Care, 1995

Critical thinking is often taken as the demonstration of the learner to think critically and orig... more Critical thinking is often taken as the demonstration of the learner to think critically and originally. Often, it is overlooked that the object of examination is the ‘surface structure’ of the spoken or printed sentences, but the ‘deep structure’ is not consideration. The probability of misjudgement is rather high because of varying degrees of access to different ‘registers’ of the language and expressive power into the prescribed language form of people from different classes of the society. This probability is higher when the language in question is a foreign language which is not available to all in the same proportion. This paper examines the process of ‘sign’ creation and the hurdles in the reading and responding to the non‐native ‘signs’. The paper later highlights the role a language can play in being judged as a critical thinker. ∗This paper is dedicated to Professor T.N Bharadwaja of Kota Open University (India).

Composite Structures, 2007

Free vibration analysis of composite cylindrical shells with different boundary conditions is pre... more Free vibration analysis of composite cylindrical shells with different boundary conditions is presented in this paper using differential quadrature method (DQM). Equations of motion are derived based on first order shear deformation theory taking the effects of shear deformation and rotary inertia terms into account. By applying the differential quadrature formulation and the required modified relationships for implementing the different boundary conditions, equations of motion of a circular cylindrical shell are transformed into a set of algebraic equations. By solving this algebraic system natural frequencies of circular cylindrical shells made of fibrous composite materials with different fibre angles are evaluated. The results thus obtained are then compared with some available results and a good agreement is observed. In all the cases studied here efficiency, ease and usefulness of the DQM are well illustrated.

Composite Structures, 1999

ABSTRACT In this paper a modified exact analytical method is employed to study the vibration char... more ABSTRACT In this paper a modified exact analytical method is employed to study the vibration characteristics of high modulus cylindrical shells laminated of a composite material. Here the axial dependence of modal forms is chosen in the form of simple Fourier series. This choice is found to be greatly helpful in the study of the influence of boundary conditions on the various vibration characteristics of such structures. Transverse shear and rotary inertia terms are included in the analysis for a more reliable prediction of response characteristics in general for the composite shells. The effectiveness and the accuracy of the present analytical method are displayed by comparing the analytical frequencies obtained here with some previously published experimental as well as theoretical results. The two sets of results were found to be in good agreement.

Composite Structures, 2006

A calculation of overall dynamic response of thin orthotropic cylindrical shells is presented. Du... more A calculation of overall dynamic response of thin orthotropic cylindrical shells is presented. Due to the obvious importance of the effects of transverse shear deformation and rotary inertia, these terms are included in the analysis. The exact method is modified to predict the dynamic behavior of an orthotropic circular cylindrical shell. The modal forms are assumed to have the axial dependence in the form of a simple Fourier series. By using the present modified exact analysis various aspects such as influence of boundary conditions, changes in shell geometrical parameters, changes in the directions of orthotropy, etc., on the frequencies, mode shapes and modal forces are studied. Analytical results are shown to be in good agreement with some available experimental and theoretical results.

Composite Structures, 2004

Due to the importance of buckling analysis of composite structures in various industrial applicat... more Due to the importance of buckling analysis of composite structures in various industrial applications a comparative study of buckling behavior of composite plates is presented here. Mathematical modelling developed in the present work for generally laminated plates is based on generalized differential quadrature rule (GDQR) and R-R method. To show the ability and robustness of the mathematical modeling in handling buckling analysis, results obtained using GDQR and R-R are compared with each other and also with some available results based on experimental and analytical works. The efficiency and reliability of the GDQR in comparison with R-R method on the buckling behavior is also discussed.

Biomedical Chromatography, 1993

Propoxur (Baygon, 2-isopropoxyphenyl N-methylcarbamate) is a carbamate pesticide commonly used ag... more Propoxur (Baygon, 2-isopropoxyphenyl N-methylcarbamate) is a carbamate pesticide commonly used against house insects. When the insecticide was administered intramuscularly in rats it was converted to a new metabolite which was found to be present in the serum, liver, kidney and brain 6 h after the administration of the pesticide. The metabolite was purified by high performance liquid to chromatography and comparison of the infrared spectra of Propoxur and the metabolite showed that a deamination reaction was responsible for the formation of the metabolite from the parent pesticide. The pesticide also induced haematological changes such as an increased level of total bilubrin, amylase and glutamic-oxalacetic transaminase and decrease of cholinesterase activity, indicating damage of the liver and nervous system in rats.