Improving RSSI based distance estimation for wireless sensor networks

In modern everyday life we see gradually increasing number of wireless sensor devices. In some cases it is necessary to know the accurate location of the devices. Most of the usual techniques developed to get this information require a lot of resources (power, bandwidth, computation, extra hardware) which small embedded devices cannot afford. Therefore techniques, using small resources without the need for extra hardware, need to be developed. Wireless sensor networks are often used inside buildings. In such environment satellite positioning is not available. As a consequence, the location computation must be done in network-based manner. In this thesis a received signal strength indicator (RSSI) based distance estimation technique for 802.15.4 network based on CC2431 radio is discussed. In this approach we try to differentiate between good and erroneous measurements by imposing limits based on standard deviation of RSSI and the number of lost packets. These limits are included as a part of the model parameter estimation process. These limits are optimized in order to improve the resulting distance estimates with minimum loss of connectivity information. We experimentally evaluated the merits of the proposed method and found it to be useful under certain circumstances.fi=Opinnäytetyö kokotekstinä PDF-muodossa.|en=Thesis fulltext in PDF format.|sv=Lärdomsprov tillgängligt som fulltext i PDF-format

Impact of Student’s Satisfaction on Loyalty A Case of Private Sector Business Schools from Punjab Pakistan

This research aims to explore the information related to the service quality, which influence on the students loyalty. Based on this the purpose of this research is to present in-depth details regarding those factors which influence positively on the students. In today’s competitive market the service industry is growing in which educational sector is gaining more benefits. Based on the modern tactics used by educational institutes the students are retained and new customers are attracted. Hence, this research present the information based on business school and the satisfaction level of students based on services provided to them.Methodology/sample: This research was based on quantitative research design. The questionnaire was prepared which was distributed to 116 participants. However, 100 questionnaire were received back which were pooled in to SPSS. The participants were approached through convenience sampling, the Pearson correlation test, linear regression analysis and reliability analysis were applied in order to test research hypothesis.Findings: The findings of the research reveals that tangibility, assurance, reliability, responsiveness and empathy are the most important factor in maintaining the service quality which influence on customer and make them loyal with the organization. In this way, the entire five research hypotheses were accepted.Practical Implications: Based on this research the business school can explore various strategies that can help them in improving their existing services and gaining sustainable advantage in educational sector

The Influence of Temporal Focus on Employee Preferences in Cybersecurity Training

This study investigates the impact of employees\u27 temporal focus on the effectiveness of Security Education, Training, and Awareness (SETA) programs in organizations. Drawing on Construal Level Theory, the research examines the relationship between temporal focus, level of abstraction in information processing, and preferences for tactical or strategic cybersecurity training. Findings confirm that employees with a present temporal focus prefer tactical training, while those with a future temporal focus prefer strategic training. Concrete cybersecurity cognition mediates the relationship between present temporal focus and tactical training preference, while abstract cybersecurity cognition mediates the relationship between future temporal focus and strategic training preference. Results emphasize the importance of understanding individual preferences when designing and delivering cybersecurity training programs to maximize engagement. The study contributes to the SETA literature

New Phosphate Bioactive Glasses With Enhanced Thermal Properties For 3D Scaffold Processing Using Robocasting

Phosphate bioactive glasses are the potential substitutes of typical silicate bioactive glass-es for repair and regeneration of the defected bone due to their resemblance to the natural bone. In earlier studies, thermal, bioactive and structural properties of different phosphate bio-active glasses were investigated by introducing various elements. Furthermore, in some stud-ies these glasses were utilized in scaffolds fabrication using methods like powder technique and foaming technique. But these techniques produced scaffolds with reduced mechanical properties due to large pores size. In this thesis, new phosphate bioactive glasses with compositions; 45P2O5, 2.5B2O3, 2.5SiO2, 10Na2O, 20CaO, (20-x)SrO, xMgO in mol% (x = 0, 5 ,10, 15 and 20) were prepared with two particle sizes i.e. <38µm and 125-250µm. The aim was to develop phosphate bioac-tive glasses that can be sintered without losing their bioactivity. Thermal analysis was per-formed for these glasses in which glass transition and crystallization temperatures were in-creased with increasing amount of MgO. By further increasing the MgO content from 15 and 20 mol%, crystallization peaks disappeared. Bioactivity studies were performed in Simulated Body Fluid (SBF) at 37°C. The ion release profile was highly function of the particles size, as can be expected from glasses. A rapid ion release, within 1 day was seen for the smaller par-ticle size. Larger particle size, 125-250µm, released ions continuously for 2 weeks. FTIR of the glass structure revealed two new bands after 2 weeks time point, especially in the sample substituted with 20 mol% of MgO for SrO, that indicated CaP layer formation. Based on thermal and bioactive properties, suitable glass compositions were chosen i.e. x = 10 and 15. These compositions were subjected to scaffold fabrication using robocasting technique in which printing head movement was controlled by programmed printing script. Ink, prepared from glass powders and Pluronic F-127 binder, was extruded to get three-dimensional scaffolds and then further sintered to obtained mechanically stable, amorphous, scaffolds. In-vitro dissolution revealed the formation of CaP layer faster and prominent in x = 15 glass scaffold. Furthermore, mechanical strength of both compositional scaffolds remained in the range of cancellous bone compressive strength even after two weeks of immersion in SBF