Papers by Ankam Ravi Kumar
Product Redesign and Pricing in Response to Competitor Entry: A Marketing-Production Perspective
Intelligent Knowledge-Based Systems, 2005
Markets are dynamic environments where competing firms are engaging in a continuous struggle to m... more Markets are dynamic environments where competing firms are engaging in a continuous struggle to maintain their market position. Often, firms that have established their presence in the market, are forced to confront new firms attempting to enter the market. In addition, firms have to deal with new products offered by existing competitors. Consider for example the case of the computer
Computer assisted instruction (CAI) as remedial teaching on diagnostic test of learning disability (DTLD) for fifth grade students
Educational Quest- An International Journal of Education and Applied Social Sciences, 2014
ABSTRACT
Evaluation of role of FV, FVIII and APLAs in the pathogenesis of APCR in FV Leiden negative DVT patients: a study in India
Journal of Thrombosis and Thrombolysis, 2017
Resistance to APC (APCR) is a very important cause of thrombophilia and most frequently caused by... more Resistance to APC (APCR) is a very important cause of thrombophilia and most frequently caused by the Leiden mutation. APCR is also seen in the absence of FV Leiden and associated with elevated levels of factor V (FV), factor VIII (FVIII) and antiphospholipid antibodies (APLAs). The aim of this prospective case control study was to find out the frequency and role of FV, FVIII and APLAs in the pathogenesis of APCR in FV Leiden negative deep vein thrombosis (DVT) patients in India. A total 30 APCR positive and FV Leiden negative patients with DVT and similar number of age and sex matched healthy controls were recruited. Significantly higher mean FVIII levels were observed in patients as compared to controls [patients: 132.3 ± 30.7 IU/ml, controls: 117.5 ± 17.7 IU/ml, p = 0.025]. A significant negative correlation was also observed between FVIII and APC ratio (Pearson correlation = 0.368, p = <0.001). Mean FV levels in patients [107.1 ± 13.1 IU/ml] and controls [102 ± 11.9 IU/ml] were not statistically significant (p = 0.119). Anti β2 glycoprotein I (Anti-β2-GPI, IgG) showed significant association with APCR phenotype (p = 0.050), unlike other factors such as protein C, protein S, lupus anticoagulant and anticardiolipin antibodies. The strong association of FVIII and anti-β2 GPI (IgG) antibodies with APCR phenotype is suggestive of incorporation of these factors in APCR positive DVT patients in the absence of FV Leiden mutation in India. However more studies in large sample size are required for setting up the proper investigation protocol in these patients.
Network based sensor localization in multi-media application of precision agriculture Part 1: Received signal strength
Proceedings of the 11th IEEE International Conference on Networking, Sensing and Control, 2014
ABSTRACT We study the problem of sensor node localization for a hybrid wireless sensor network de... more ABSTRACT We study the problem of sensor node localization for a hybrid wireless sensor network deployed in a precision agriculture farm, with nodes located both underground and above-ground. We consider received signal strength measurements from unmodulated signals transmitted between neighboring sensor nodes and between satellite nodes and sensor nodes for ranging purposes. While this paper studies the network based localization of sensors, placed in multiple media, based on the measurements of received signal strengths, in a companion paper we study the same problem based on the time of arrival measurements. The localization problem is formulated with the goal of parameter estimation of the joint distribution of the ranging measurements. First, we arrive at power fading models for the two communication scenarios in our network to model the received signal strength in terms of propagation distance and hence, the participating nodes' location coordinates. We account for various signal degradation effects such as fading, reflection, transmission, and signal interference. Then, we formulate maximum likelihood optimization problems to estimate the nodes' location coordinates using the derived statistical models. We also present a sensitivity analysis of the estimates with respect to the soil complex permittivity and magnetic permeability.
International Orthopaedics, Jun 1, 2009
The focus of this study was to evaluate the functional result and to specifically ascertain wheth... more The focus of this study was to evaluate the functional result and to specifically ascertain whether the absence of the ability to squat and sit cross-legged altered the patient's satisfaction level after a successful standard total knee replacement. Squatting and sitting cross-legged are common practices in Asia. These activities are not possible following standard total knee replacement. Patients were followed-up for a minimum of 12 months post surgery. Their level of satisfaction was assessed using a Likert scale. The Knee Society Score (KSS) was used to assess range of motion and function of the knee. Twentyone out of 25 patients were satisfied with the surgical result in spite of an inability to squat. Deep knee flexion may not be an essential prerequisite for patient satisfaction after total knee replacement, even in a population where squatting and sitting cross-legged are part of the normal lifestyle.
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Papers by Ankam Ravi Kumar