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Prey Predator Fishery Model with Stage Structure in Two Patchy Marine Aquatic Environment

Applied Mathematics 2011年第11期2卷 1405-1416页

作者： Mellachervu Naga srinivas mantripragada ananata satya srinivas Kalyan Das Nurul Huda Gazi 不详

In this paper, we propose and analyze a mathematical model to study the dynamics of a fishery resource system with stage structure in an aquatic environment that consists of two zones namely unreserved zone (fishing permitted) and reserved zone (fishing is strictly prohibited). In this model we introduce a stage structure in which predators are split into two kinds as immature predators and mature predators. It is assumed that immature predators cannot catch the prey and their foods are given by their parents (mature predators). It is also assumed that the fishing of immature predators prohibited in the unreserved zone and predator species are not allowed to enter inside the reserved zone. The local and global stability analysis has been specified. Biological and Bionomical equilibriums of the system are derived. Mathematical formulation of the optimal harvesting policy is given and its solution is derived in the equilibrium case by using Pontryagin’s maximum principle.

关键词： Prey Predator Stage Structure Local and Global Stability Bionomic Equilibrium Optimal Harvesting Pontryagin’s Maximum Principle

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Effects of Pseudolite Positioning on DOP in LAAS

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Positioning 2010年第1期1卷 18-26页

作者： Quddusa Sultana Dhiraj Sunehra Vemuri satya srinivas Achanta Dattatreya Sarma Deccan College of Engineering and Technology JNTUH College of Engineering

In this paper, effects on DOP (Dilution of Precision) due to augmentation of Global Positioning System (GPS) with pseudolites are investigated. For this purpose, a typical Local Area Augmentation System (LAAS) scenario is consi-dered by placing pseudolites in various positions. It is found that only properly located pseudolites can improve the DOP. DOP values with two pseudolites located on either side of the run way are found to be the best. Geometric DOP (max) was found to be nearly 4 due to only GPS and came down to approximately 2 due to augmentation with two pseudolites. Implementation aspects of Bayes and Kalman filters while estimating DOP values are also examined.

关键词： GPS Bayes Filter Kalman Filter DOP Pseudolite LAAS

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Safety and Efficacy of Ultra-Thin, Biodegradable Polymer Coated Sirolimus-Eluting Supralimus-Core Stents in Real-World Patients: Outcomes at 24-Month Follow-Up

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World Journal of Cardiovascular Diseases 2018年第11期8卷 523-532页

作者： Kala Jeethender Kumar Jain Subash Dasarapu Sai Satish Oruganti Jyotsna Maddury srinivas Bhyravavajhala Rama Kumari Nuthalapati Vanaparthi satya Bharathi Lakshmi Rajender Betham Anil Kumar Enikapalli Nizam’s Institute of Medical Sciences Hyderabad Telangana India

Aim: The purpose of this registry was to establish long-term safety and efficacy through implantation of Supralimus-Core sirolimus-eluting stents (SES) in real-world patients with coronary artery disease (CAD). Methods:The present registry was a retrospective, singe-arm, single-centre, investigator-initiated registry. A total of 372 consecutive patients were implanted with Supralimus-Core SES between January 2015 and November 2016. The primary endpoints were major adverse cardiac events (MACE), a composite of cardiac death, myocardial infarction (MI), target lesion revascularization (TLR) and target vessel revascularization (TVR) at 24 months. The secondary endpoints were all-cause death and all separate components of the primary endpoint. Additional endpoints included events of stent thrombosis classified as definite, probable, and possible stent thrombosis. Follow-ups were conducted at 30-days, 6-months, 12-months and 24-months after the index procedure. Results: The mean age of the registry population was 56.3 ± 11.1 years. Males constituted 276 (74.2%) patients. Hypertensives, diabetics, alcoholics, tobacco chewers and smokers comprised 198 (53.2%), 160 (43.0%), 93 (25.0%), 91 (24.5%) and 88 (23.7%) of the registry population, respectively. The mean length and diameter of stents implanted was 19.3 ± 8.8 mm and 2.9 ± 0.3 mm, respectively. At the 24-month follow-up, MACE was reported in 14 (3.8%) patients. Cardiac death, MI, TLR and TVR was reported in 7 (1.9%), 4 (1.1%), 3 (0.8%) and 4 (1.1%) patients, respectively. Overall stent thrombosis occurred in 4 (1.1%) patients. Conclusions: The low MACE rate of 3.8% at the 24-month follow-up indicates favorable long-term results after implantation of the ultra-thin strut Supralimus-Core SES in all-comer, real-world patients.

关键词： Biodegradable Polymer Cobalt-Chromium Coronary Artery Disease Drug Eluting Stents Percutaneous Coronary Intervention Sirolimus-Eluting Stent

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