Blockchain’s vast applications in different industries have drawn several researchers to pursue extensive research in securing blockchain technologies. In recent times we could see several institutions coming together to create consortium based blockchain networks such as Hyperledger. Although for applications of blockchain such as Bitcoin, Litcoin, etc. the majority-attack might not be a great threat but for consortium based blockchain networks where we could see several institutions such as public, private, government, etc. are collaborating, the majority-attack might just prove to be a prevalent threat if collusion among these institutions takes place. This paper proposes a methodology where we can use intelligent software agents to monitor the activity of stakeholders in the blockchain networks to detect anomaly such as collusion, using supervised machine learning algorithm and algorithmic game theory and stop the majority attack from taking place.

The work proposes Inter-Symbol Interference (ISI) reduction scheme, ISI being a major problem in Optical systems, which produces various type of non-linear distortions. So the implementation of OFDM system using Artificial Neural Network (ANN) scheme with M-QAM modulation technique is proposed and compared with the conventional OFDM system without using ANN. This proposed scheme is implementation of Back-propagation (BP) algorithm over AWGN channels to achieve an effective ISI reduction in orthogonal frequency division multiplexing (OFDM) systems. Simulation results prove that ANN equalizer can further reduce ISI effectively and provide acceptable BER and better MSE plot compared to conventional OFDM system.

According to Palestinian police records, cybercrimes have become common last few years in Palestine. The most commonly reported cybercrimes are mainly based on social networks to hack victims asking for some service. Many efforts are carried out by police and related agencies to handle these crimes and save the victims. In this paper, we will study cybercrimes in Palestine as a matter of the art and we will focus on parties involved in thwarting cybercrimes. These parties include: 1) ministry of higher education where they have a great role to afford knowledge about cybercrimes and ethical issues related to IT in school curricula. 2) Palestinian legislative council for adopting concrete cybercrime laws and regulations. and 3) Police department by broadening the role of cybercrime unit and gaining the trust of people about that unit. A survey designed and distributes and aimed to test the effect of cybercrime on individuals in Palestine, the survey results are reported. According to the findings and survey results, recommendations are provided with the aim of leveraging the ability to fight cybercrimes in Palestine in the near future.

In this paper, a simple method based on coupling control theory to suppress multiple harmonics in open-loop bandpass filters is proposed. Coupled feeding is utilizing in this paper, and by choosing proper coupling length and position of the input/output port, multiple harmonics could be suppressed. The input impedance of microstrip line with its end open-circuited is firstly showed and the theory on harmonics suppression is then analyzed to choose a proper coupling position. A second-order open-loop bandpass filter is designed and manufactured, measured and manufactured results both have a stopband to 5f0 with rejection more than 20dB. On the base of the filter proposed, the stopband can be broaden to 10f0 by adding two stubs. It well validates the proposed solution. 

This paper proposes a design of fractal multi-band microstrip patch antenna dedicated for wireless applications. The proposed antenna uses a FR-4 epoxy substrate having permittivity 4.4 and tangent loss to be 0.02.The microstrip antenna proposed is designed by incorporating double I-shape slot on the surface of rectangular patch and simulated by using HFSS software. Further the antenna is modified by inserting fractal shape and obtained the three frequency bands located at 2.4Ghz , 3.5Ghz and 5.50Ghz respectively and antenna parameter like VSWR, return loss, antenna gain, directivity of an antenna and bandwidth has been analyzed. The designing of proposed antenna is to be followed by fabrication by using A FR-4 substrate of thickness 1.60mm. Further, this paper discusses, the simulated and measured results comparison and analysis of the same. For designing and simulating of antennae simulation software HFSS has been used. The simulated and measured results represented are in permissible range.

The mobility and pervasiveness have created many opportunities of using mobile phones in performing activities of SMEs. This is due to the low ICT readiness especially in SMEs operating in less developed countries compared to large firms. Some of the challenges facing Tanzanian SMEs include but are not limited to poor ICT infrastructures, lack of ICT skills, lack of management support, poor financial capabilities and lack of reliable electrical power supply.
While there is a number of studies which explains the factors influencing adoption and usage of mobile phones in SMEs, it is still unclear whether the mandatoriness has an impact on such acceptance. Understanding the voluntary aspects provides informed decision-making for SME managers and potential stakeholders on identifying the issues which need their attention. This study involved a survey of 459 respondents from Tanzanian SMEs using SEM and AMOS. The results show that the mandated use of mobile phones in the SMEs has a moderating effect on the overall acceptance of mobile phones in performing daily activities.  Recommendations and suggestions for future works are also highlighted in this article.