Exploiting user contention to optimize proactive resource allocation in future networks

In order to provide ubiquitous communication, seamless connectivity is now required in all environments including highly mobile networks. By using vertical handover techniques it is possible to provide uninterrupted communication as connections are dynamically switched between wireless networks as users move around. However, in a highly mobile environment, traditional reactive approaches to handover are inadequate. Therefore, proactive handover techniques, in which mobile nodes attempt to determine the best time and place to handover to local networks, are actively being investigated in the context of next generation mobile networks. The Y-Comm Framework which looks at proactive handover techniques has de�fined two key parameters: Time Before Handover and the Network Dwell Time, for any given network topology. Using this approach, it is possible to enhance resource management in common networks using probabilistic mechanisms because it is now possible to express contention for resources in terms of: No Contention, Partial Contention and Full Contention. As network resources are shared between many users, resource management must be a key part of any communication system as it is needed to provide seamless communication and to ensure that applications and servers receive their required Quality-of-Service. In this thesis, the contention for channel resources being allocated to mobile nodes is analysed. The work presents a new methodology to support proactive resource allocation for emerging future networks such as Vehicular Ad-Hoc Networks (VANETs) by allowing us to calculate the probability of contention based on user demand of network resources. These results are veri�ed using simulation. In addition, this proactive approach is further enhanced by the use of a contention queue to detect contention between incoming requests and those waiting for service. This thesis also presents a new methodology to support proactive resource allocation for future networks such as Vehicular Ad-Hoc Networks. The proposed approach has been applied to a vehicular testbed and results are presented that show that this approach can improve overall network performance in mobile heterogeneous environments. The results show that the analysis of user contention does provide a proactive mechanism to improve the performance of resource allocation in mobile networks

Performance Evaluation of K-Anonymized Data

Data mining provides tools to convert a large amount of knowledge data which is user relevant. But this process could return individual2019;s sensitive information compromising their privacy rights. So, based on different approaches, many privacy protection mechanism incorporated data mining techniques were developed. A widely used micro data protection concept is k-anonymity, proposed to capture the protection of a micro data table regarding re-identification of respondents which the data refers to. In this paper, the effect of the anonymization due to k-anonymity on the data mining classifiers is investigated. NaEF;ve Bayes classifier is used for evaluating the anonymized and non-anonymized data

Factors influencing on the Academic performance of students in business education

This study analyses the factors of students’ commitment and teaching context which influence on the academic performance of students. The study findings reveal that the students’ commitment, teaching context and students’ academic performance are in satisfactory level. Students’ commitment has positive moderate influence and teaching context have weak positive influence on the academic performance of students. The regression analysis shows that both students’ commitment and teaching context explain 21.4% of variation on the academic performance of students, while 78.6% of variation in the academic performance of students is unexplained by these both variables. These unexplained variations may be caused from personality, family background, prior knowledge, physical and psychological competencies, cognitive skills of students and learning habit etc. Therefore the teacher needs to improve present teaching context in alliance with personal factors of students in order to improve students’ learning in business education in a university

Stress Management competencies among banking sector managerial employees in the Batticaloa district

This paper examines the level of stress management competencies among banking sector managerial employees. Further, this study explores the level of effect personal factors on stress management competencies. The stress management competencies is measured using the dimension of respectful and responsible behavior, managing and communicating work, managing individual in a team and managing difficult situations. The data is collected using questionnaires from 84 managerial employees who are randomly selected from the banks in the Batticaloa district. The data is analyzed using the statistical techniques of descriptive statistics, one sample t test, independent sample t test, ANOVA test, correlation and cross tabulation techniques. The study found that the stress management competencies of managerial employees are high level in the bank. The dimension of respectful and responsible behavior, managing and communicating work and managing difficult situations are also fall in this level. And the managing individual in a team is very high level. The study also shows that there is strong positive impact on each other competencies. Comparing personal profile of managers with their competencies shows that, female managerial staffs have significance competencies in managing difficult situation than male. Married employees have more respectful and responsible behavior than single. Joint family setting has more managerial competencies than separate. Age and experience have weak negative effect on the managerial competencies of people. Training time did not significant effect on the managerial competencies of staff. Income levels of managerial staffs have significance difference in stress management competencies. Further the type tasks involved, designation of managerial employees also have differences in stress management competencies. Hence, the special attention have to be taken by management in designing and implementing stress management training to enhance the stress management competencies of banking sector staff

The design and implementation of serious games for driving and mobility

The automotive and transportation sectors are showing consistent improvements in trends and standards concerning the safe and convenient travel of the road users. In this growing community of road users, the driver performance is a notable factor as many on-road mishaps emerge out of poor driver performance. In this research work, a case-study and experimental analysis were conducted to improve driver performance through the deployment of serious games. The primary motive of this work is to stimulate the on-road user performance through immediate feedback, driver coaching, and real-time gamification methods. The games exploit the cloud-based architecture to retrieve the driver performance scores based on real-time evaluation of vehicle signals and display the outcomes on game scene by reflecting the game parameters based on real-world user performance (in the context of driving and mobility). The deployment of games in cars is the topic of interest in current state-of-the-art, as there are more factors associated with it, such as safety, usability, and willingness of the users. These aspects were taken into careful consideration while designing the paradigm of gamification model. The user feedback for the real-time games was extracted through pilot tests and field tests in Genova. The gamification and driver coaching aspects were tested on various occasions (plug-in and field tests conducted at 5 European test sites), and the inputs from these field tests enabled to tune the parameters concerning the evaluation and gamification models. The improvement of user behavior was performed through a virtuous cycle with the integration of virtual sensors to the serious gaming framework. As the culmination, the usability tests for the real-time games were conducted with 18 test users to understand the user acceptance criteria and the parameters (ease of use and safety) that would contribute to the deployment of games. Other salient factors such as the impact of games, large-scale deployment, collaborative gaming and exploitation of gaming framework for 3rd party applications were also investigated in this research activity. The analysis of the usability tests states that the user acceptance of the implemented games is good. The report from usability study has addressed the user preferences in games such as duration, strategy and gameplay mechanism; these factors contribute a foundation for future research in implementing the games for mobility

Preoperative factors predicting Postoperative Morbidity in patients with Periampullary Carcinoma undergoing Pancreaticoduodenectomy

Periampullary carcinoma is a carcinoma that forms near the ampulla of vater, an enlargement of the ducts from the liver and pancreas where they join and enter the small intestine. It consists of: 1. ampullary (Ampulla of vater), 2. Biliary (Intrapancreatic distal bile duct), 3. Pancreatic (Head –Uncinate process), 4. Duodenal (mainly from the second portion). AIM OF THE STUDY: 1. To evaluate the incidence of Periampullary carcinoma in Stanley Medical College from Feb 2016 to Sep 2016. 2. To know the clinical manifestation. 3. To know the investigations to aid the diagnosis and assess the respectability of these tumors. 4 To know about the preoperative factors which determine the postoperative morbidity in patients undergoing whipples procedure. 5. To study the treatment instituted and the management of complications. 6. To review the literature on the subject. MATERIALS AND METHODS: The study is to be carried out in Govt. Stanley Medical College Hospital, Chennai. This is a facility based prospective descriptive study involving all patients diagnosed as periampullary carcinoma clinically, radiologically, and pathologically. The relevant data shall be collected by using. • Detailed history. • Hematological investigations: complete hemogram, liver function test, serum proteins and albumin. • Coagulation profile – PT, aPTT, INR. • Blood culture & sensitivity Stool for occult blood. • Imaging studies : X-ray chest, X ray abdomen erect. • USG abdomen & pelvis – to find liver, gallbladder, common bile duct, pancreas and duodenum lesions, • CT (Plain and contrast) abdomen & pelvis /MRCP– to find exact location, size, extent of tumour. • Patients undergoing pancreaticoduodenectomy – pathologically proven carcinomatous. • lesions. • Postoperative factors like ventillatory support, abdominal distention, coagulation profile, peritonitis, fever, sepsis, no of days of ICU stay, ionotropic support, biochemical derangements are taken into study. Preoperative factors included in study: Age, Tumour localization, CA 19-9 levels, Preoperative bilirubin levels, Preoperative albumin levels, ERCP and stenting, cholangitis. Postoperative factors included in study: Ventillatory support, Sepsis, No of days of ICU stay, Ionotropic support, Biochemical derangements, Relaporotomy. Inclusion Criteria: All patients with periampullary carcinoma undergoing pancreaticoduodenectomy (whipple procedure) in Govt. Stanley Hospital. EXCLUSION CRITERIA: Uncertain diagnosis and death. SUMMARY: Among the study group of 25 patients underwent pancreaticoduodenectomy commonest neoplasm is ampullary growth. • Male female ratio 2.8: 1. • Age – commonest in our study is 6th decade. • In our study age group ranges from 3rd to 7th decade. • Ampullary growth is common in males, where as in females head of pancreas growth is common. • Among study group females had higher incidence of ampullary growth when they enter 6th decade. • Most common presenting symptom is abdominal pain, followed by jaundice. • Hyperbilirubinemia is seen in 74% of patients. • Cholangitis is seen in 48% of patients Hypoalbuminemia seen in 76% of patients. • Hypoalbuminemia is common in ampullary neoplasms, followed by head of pancreas Neoplasm. • 60% of patients with obstructive jaundice underwent ERCP and 35% of patients underwent. • ERCP guided stenting. • 12% (3 out of 25) patients had h/o previous surgery. • Patients having preoperative cholangitis had - post operative septicaemia, - requires ionotropic supports, - prolonged ventillatory support. • Among the patients who had preoperative cholangitis ERCP stented patients had uneventful. • postoperative course. • CA19- 9 levels elevated in 88% 0f cases. • 4% (1 patient) received preoperative chemotherapy. • 12% of patient underwent relaporotomy, commonest indication being pancreatic anastomotic leak (PJ > PG) followed by haemorrhage. • 4% of patient underwent angioembolisation for haemorrhage. CONCLUSION: Periampullary neoplasms are common in males. • Majority of patient underwent pancreaticoduodenecomy, commonest neoplasm is ampullary growth. • Maximum age of incidence is between 60 to 70 years. • Male female ratio 2.8: 1. • Commonest presentation is abdominal pain and jaundice. • CA 19 – 9 levels elevated in 88% of cases. • Hyperbilirubinemia and hypoalbuminemia causes severe postoperative morbidity. • Patients with obstructive jaundice requires ERCP and stenting reduces postoperative. • Morbidity. • Patients with obsructive jaundice requires prolonged ventillatory support, ionotropic support. • Patients with preoperative cholangitis had postoperative sepsis commonly. • Commonest indication for relaporotomy is pancreatic leak. • (PJ > PG). • Preoperative preparation of patient is influences the outcome of surgery

Exploring analytical models for proactive resource management in highly mobile environments

In order to provide ubiquitous communication, seamless connectivity is now required in all environments including highly mobile networks. By using vertical handover techniques it is possible to provide uninterrupted communication as connections are dynamically switched between wireless networks as users move around. However, in a highly mobile environment, traditional reactive approaches to handover are inadequate. Therefore, proactive handover techniques, in which mobile nodes attempt to determine the best time and place to handover to local networks, are actively being investigated in the context of next-generation mobile networks. Using this approach, it is possible to enhance channel allocation and resource management by using probabilistic mechanisms; because, it is possible to explicitly detect contention for resources. This paper presents a proactive approach for resource allocation in highly mobile networks and analyzed the user contention for common resources such as radio channels in highly mobile wireless networks. The proposed approach uses an analytical modelling approach to model the contention and results are obtained showing enhanced system performance. Based on these results an operational space has been explored and are shown to be useful for emerging future networks such as 5G by allowing base stations to calculate the probability of contention based on the demand for network resources. This study indicates that the proactive model enhances handover and resource allocation for highly mobile networks. This paper analyzed the effects of and alpha and beta, in effect, how these parameters affect the proactive resource allocation requests in the contention queue has been modelled for any given scenario from the conference paper "Exploring analytical models to maintain quality-of-service for resource management using a proactive approach in highly mobile environments"

Effect of Carbon-Doping in Bulk Superconducting MgB2 Samples

Bulk superconducting samples of MgB2 were prepared by solid state reaction of stoichiometric quantities of Mg turnings and B in a sealed Ta cylinder at 890 C for 2 hours. The as-synthesized MgB2 samples had a Tc of 39 K, as defined as the onset of diamagnetism. The crystal symmetry was found to be hexagonal with lattice parameters, a=3.0856 A, and c=3.5199 A, similar to the literature values. To study the effect of carbon doping in MgB2, various C-containing samples of x varying from 0 to 1.00 in MgB2-xCx were prepared. Magnetic characterizations indicate that the Tc onset is same for pure and C-doped samples for x = 0.05, and 0.10. However, the shielding signal decreased monotonically with C content, apparently due to the presence of carbon on the grain boundaries that isolates grains and prevents flow of supercurrents on the perimeter.Comment: 10 pages, 3 figure