91 research outputs found
Indoor Wireless Communications using Slotted ISMA protocols
No full textThe performance of the Slotted ISMA protocols in Rician fading channel for Indoor Wireless communications considering Pico Cellular systems have been analyzed in this thesis. The throughput of Slotted nonpersistant Inhibit Sense Multiple Access (np-ISMA), Slotted 1-persistent ISMA (1p-ISMA) and Slotted np-ISMA\CD (Collision Detection) is investigated in the presence of n-interfering signals whose random amplitudes are considered as Rician distributed. Numerical results are presented, indicating the effect of propagation impairments on channel capacity. The results are of importance for mobile networks and indoor wireless office communications.Electrical Engineering, Mathematics and Computer ScienceTelecommunicatie- en Verkeersbegeleidingssysteme
Binary Pattern for Nested Cardinality Constraints for Software Product Line of IoT-Based Feature Models
No full textSoftware product line (SPL) is extensively used for reusability of resources in family of products. Feature modeling is an important technique used to manage common and variable features of SPL in applications, such as Internet of Things (IoT). In order to adopt SPL for application development, organizations require information, such as cost, scope, complexity, number of features, total number of products, and combination of features for each product to start the application development. Application development of IoT is varied in different contexts, such as heat sensor indoor and outdoor environment. Variability management of IoT applications enables to find the cost, scope, and complexity. All possible combinations of features make it easy to find the cost of individual application. However, exact number of all possible products and features combination for each product is more valuable information for an organization to adopt product line. In this paper, we have proposed binary pattern for nested cardinality constraints (BPNCC), which is simple and effective approach to calculate the exact number of products with complex relationships between application's feature models. Furthermore, BPNCC approach identifies the feasible features combinations of each IoT application by tracing the constraint relationship from top-to-bottom. BPNCC is an open source and tool-independent approach that does not hide the internal information of selected and non-selected IoT features. The proposed method is validated by implementing it on small and large IoT application feature models with "n'' number of constraints, and it is found that the total number of products and all features combinations in each product without any constraint violation.This work was supported by the National Research Foundation of Korea through the Korean Government (MSIP) under Grant NRF-2016R1C1B2008624
Unslotted Hybrid CDMA/ISMA Protocol for Indoor Wireless Computer Communications
No full textA hybrid Code Division Multiple Access / Inhibit Sense Multiple Access (CDMA/ISMA) protocol has been proposed as an effective multiple access scheme for Indoor Wireless Computer Communications. This new protocol combines the advantages of both CDMA and ISMA into one protocol. On the one hand the ISMA protocol introduces a limitation to the number of simultaneous accesses to the transmission channel. On the other hand the CDMA protocol introduces an improvement to the packet survival chance. It is shown that the performance of the hybrid protocol is indeed better than CDMA only. In addition, code sharing can be applied to reduce hardware cost. The slotted hybrid CDMA/ISMA protocol using the p-persistent ISMA scheme has already been analysed. In this report, we investigate the hybrid protocol using the unslotted non-persistent ISMA scheme. The analysis is done for a star-connected multiple access wireless computer network. The performance comparison between the slotted and unslotted hybrid CDMA/ISMA protocol is evaluated in terms of throughput and delay using computer simulation and mathematical analysis.Electrical Engineering, Mathematics and Computer ScienceTelecommunicatie- en Verkeersbegeleidingssysteme
Performance Analysis of Slotted ISMA Protocols for Mobile Communications on a Three Lane Motorway
No full textA slotted ISMA protocol has been proposed for using with the communication channel from vehicles to a base station near the motorway. In this report the performance of this channel using the proposed protocol is analysed. Three slotted ISMA protocols can be distinguished, namely: • p-persistent slotted ISMA; • 1-persistent slotted ISMA; • non-persistent slotted ISMA. The performance of the protocol has been measured in terms of the throughput and the packet delay of the communication channel. The system has been modelled by assuming a capture receiver at the base station. The vehicles are assumed to maintain constant velocities while moving in one direction inside a cell of 200 metres on a three-lane motorway. The distribution of the vehicle positions on the motorway has been considered. Also the influence of the packet length and collision detection ratio will be examined. Furthermore the integration of DECT with the designed system is investigated. The performance of the system has been investigated for three traffic types: light traffic, heavy traffic and queuing traffic.Applied SciencesElectrical EngineeringTelecommunications and Traffic-Control Systems Grou
Multi-Objective Optimum Solutions for IoT-Based Feature Models of Software Product Line
No full textA software product line is used for the development of a family of products utilizing the reusability of existing resources with low costs and time to market. Feature Model (FM) is used extensively to manage the common and variable features of a family of products, such as Internet of Things (IoT) applications. In the literature, the binary pattern for nested cardinality constraints (BPNCC) approach has been proposed to compute all possible combinations of development features for IoT applications without violating any relationship constraints. Relationship constraints are a predefined set of rules for the selection of features from an FM. Due to high probability of relationship constraints violations, obtaining optimum features combinations from large IoT-based FMs are a challenging task. Therefore, in order to obtain optimum solutions, in this paper, we have proposed multi-objective optimum-BPNCC that consists of three independent paths (first, second, and third). Furthermore, we applied heuristics on these paths and found that the first path is infeasible due to space and execution time complexity. The second path reduces the space complexity; however, time complexity increases due to the increasing group of features. Among these paths, the performance of the third path is best as it removes optional features that are not required for optimization. In experiments, we calculated the outcomes of all three paths that show the significant improvement of optimum solution without constraint violation occurrence. We theoretically prove that this paper is better than previously proposed optimization algorithms, such as a non-dominated sorting genetic algorithm and an indicator-based evolutionary algorithm.This work was supported by the National Research Foundation of Korea through the Korean government (MSIP) under Grant NRF-2016R1C1B2008624
Performance Analysis of a Hybrid ISMA/CDMA Protocol for Indoor Wireless Communication
No full textThe hostile transmission medium encountered in Indoor: Wireless Communications (IWC) requires the use of special communication protocols. In this report we investigate a combination of the Inhibit Sense Multiple Access (ISMA) and Code Division Multiple Access (CDMA) protocols. The ISMA protocol limits the number of simultaneous accesses to the transmission channel and the CDMA protocol improves the packet survival chance. With CDMA each bit is transmitted using several code bits, giving each signal has its own, easy to recognize, signature. Coding spreads the signal over a large transmission bandwidth, which makes it particularly resistant to fading and multipath propagation, two key factors which degrade network performance…Applied SciencesElectrical EngineeringTelecommunications and Traffic Control Systems Grou
Hybrid CDMA / ISMA Protocol in Rician Fading Channel in Indoor Wireles Data Communications
No full textThis thesis describes the performance analysis of a star-connected, indoor wireless computer data communication system using direct-sequence code division multiple access (DS-CDMA) and Hybrid CDMA / Inhibit Sense Multiple Access (ISMA) protocol. The channel performance is investigated in terms of bit error rate (BER) and the protocol performance is investigated in terms of traffic-throughput and throughput-delay characteristics. To enhance the performance, a diversity technique using Maximum Ratio Combining (MRC) is used. Comparison of the simulation results with the analytical results is also performed.Applied SciencesElectrical EngineeringTelecommunications and Traffic Control Systems Grou
PENGARUH KEPEMIMPINAN VISIONER, PERILAKU ORGANISASI, KOMUNIKASI PERSUASIF DAN KOMITMEN ORGANISASIONAL TERHADAP KINERJA KARYAWAN HONORER IAIN SULTHAN THAHA SAIFUDDIN JAMBI
No full textThe objective of this research is to study the effect of visionary leadership,
organizational behavior, persuasive communication and organizational
commitment on the performance. The research approach is quantitative and the
analysis method used is path analysis The research was conducted at IAIN
Sulthan Thaha Saifuddin located in Jambi, using survey with the samples of 87
temporary staffs being selected simple randomly.The research findings show: (1)
visionary leadership has positively and significantly affected the performance; (2)
organizational behavior has positively and significantly affected the performance;
(3) organizational behavior has positively and significantly affected the
organizational commitment; (4) persuasive communication has positively and
significantly affected the organizational commitment. Based on these findings, it
can be concluded that enhancing the performance can be done through
strengthening leadership and improving organizational behavior. It was also
obtained that (1) performance was not significantly influenced by organizational
commitment and persuasive communication, and (2) organizational commitment
was not significantly influenced by visionary leadership.
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Tujuan penelitian ini adalah mempelajari pengaruh kepemimpinan visioner,
perilaku organisasi, komunikasi persuasif dan komitmen organisasional terhadap
kienrja. Pendekatan penelitian bersifat kuantitatif dan metode yang digunakan adalah
analisis jalur. Penelitian dilakukan pada IAIN Sulthan Thaha Saifuddin yang terletak
di Jambi, menggunakan survei dengan sampel 87 karyawan honorer yang dipilih secara
acak. Temuan penelitian menunjukkan: (1) kepemimpinan visioner berpengaruh positif
dan signifikan terhadap kinerja; (2) perilaku organisasi berpengaruh positif dan
signifikan terhadap kinerja; (3) perilaku organisasi berpengaruh positif dan signifikan
terhadap komitmen organisasional; (4) komunikasi persuasif berpengaruh positif dan
signifikan terhadap komitmen organisasional. Berdasarkan temuan-temuan tersebut
dapat disimpulkan bahwa untuk meningkatkan kinerja dapat dilakukan dengan
memperkuat kepemimpinan dan memperbaiki perilaku organisasi. Dari hasil
peneIitian juga diperoleh bahwa (1) kinerja tidak dipengaruhi secara signifikan oleh
komitmen organisasional dan komunikasi persuasif dan (2) komitmen organisasional
tidak dipengaruhi secara signifikan oleh kepemimpinan visoner
Throughput analysis of some mobile packet radio protocols in Rician fading Channels
No full textThe throughput of packet radio channels is investigated theoretically using the interference model in Rician fading environment. Three types of packet protocols are considered, namely: i) slotted ALOHA, ii) unslotted nonpersistent ISMA, and iii) slotted nonpersistent ISMA. Numerical results are presented, indicating the effect of propagation impairments on channel capacity. The results are of importance for mobile data networks, wireless office communications and other packet systems with contention-limited performance.Electrical Engineering, Mathematics and Computer ScienceTelecommunicatie- en Verkeersbegeleidingssysteme
Street Children Religious Education: A Study on Car Window Cleaning Kids in Jambi
No full textChildren begin careers on the streets in several locations in the city of Jambi. They work on the streets as street musicians, vehicle glass cleaners, newspaper and tissue sellers, both forcibly and deliberately. Their existence is influenced by some factors, such as family neglect and socio-economic conditions; as well as finding work on the streets and sustaining the work are much easier than looking for work which uses energy or mind. The purpose of this research is to study the religious education of street children who become car glass cleaners which has increased significantly compared to other street professions. This study aims to explore two issues: where the children obtain their religious education and to what extent they practice it in their daily life. Qualitative collecting data techniques were used including observation and interviews. This research found that the street children interviewed in this study only had access to religious education at morning school. They do not attend madrasah, the Qur'an educational school or Taman Pengajian Alquran (TPA), and Sekolah Islam Terpadu. The dominant factors affecting their religious education were their school and their peer group at school. Meanwhile, parents seldom practice the religious duty in family, thus the parents’ influence on the children’s religious practices was minimal. Therefore, this research recommends other actors give early religious education for street children. Religious education can be integrated with their shelter homes which can be their early Islamic religious education
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