A User Scheduling Scheme for Reducing Electromagnetic (EM) Emission in the Uplink of Mobile Communication Systems

The ubiquity and convergence of wireless communication services have contributed to an unprecedented popularity of mobile communications. Given that wireless communication systems operate on radiofrequency waves, the electromagnetic (EM) radiation exposure they generate is also unprecedented and, hence, this could have adverse health effects on both humans and animals according to the World Health Organization. In this paper, we propose a user scheduling/power allocation scheme to minimize the EM exposure of users subject to transmitting a target number of bits. Our user scheduling method is based on assigning priority levels to each user and the user with the lowest priority level is scheduled for transmission. Power allocation, on the other hand, is based on the water-filling approach over time by using the past channel gains of a user to compute its water level. Simulation results show that our proposed scheme performs much better than a spectral efficiency based scheme but has a higher EM emission in comparison with a non-practical ideal scheme

Parameter extraction and estimation based on the PV panel outdoor performance using iterative method

This work presents a novel approach to predict the voltage-current (V-I) characteristics of a PV panel under varying weather conditions to estimate the PV parameters. Outdoor performance of the PV module (AP-PM-15) was carried out for several times. The experimental data obtained are validated and compared with the estimated results obtained through simulation based on the manufacture’s data sheet. The simulation is based on the Newton-Raphson iterative method in MATLAB environment. This approach aids the computation of the PV module’s parameters at any varying weather condition. The computed significant error indicates that the result has a good agreement with the experimental data.Keywords: Newton-Raphson, Parameter extraction, Simulation, Photovoltaic, Relative erro

Comparative Study of Conventional and Water Circulating-Heat Sink Cooling Base Thermoelectric Generator System for Optimum Solar Thermal Waste Heat Recovery

A novel technique for waste heat recovery in solar thermal power generation is investigated through experimentation and  systematically presented. Power generation using Thermoelectric Generator (TEG) is a promising technique in waste heat recovery application. In this topology, TEG array is directly attached to the back of the solar Photovoltaic panel (model AP-AM15) to receive the transmitted heat at the back of the PV panel as waste heat. More so, a circulating water-heat sink is attached to the TEG cold side to improve the temperature gradient. Base on Seebeck effect, the TEG directly converts the temperature difference into electricity. The experimental result shows that efficiency between the range of 2.1% and 4.7% for the conventional cooling system while the output power approximately ranges between 0.05W and 0.47W, the circulating water-heat sink technique has efficiency ranging between 2.9% and 10.3% with output power between the range of 0.10W and 2.2W. The daily average increase in efficiency was found to be 263.76%. This shows that the daily average power is improved by a factor of 2.6376 with the water circulating water-heat sink technique. This is an indication of waste heat recovery from the solar thermal power generation

Spectral Efficiency Improvements in HetNets by Exploiting Device-to-Device Communications

Next generation cellular networks require huge capacity, ubiquitous coverage and maximum energy efficiency. In order to meet these targets, Device-to-device (D2D) communication is being considered for future heterogeneous networks (HetNets). In this paper, we consider a three tier hierarchical HetNet by exploiting D2D communication in traditional HetNet. D2D communication is deployed within the HetNet where closely located mobile users are engaged in direct communication without routing the traffic through cellular access network. The proposed configuration mandates to reduce the interference offered by the resultant HetNet by reducing the transmitter-receiver distance and ensuring that the mobile users are transmitting with adaptive power subject to maintaining their desired link quality. In this context, we analyzed and compared the spectral efficiency improvements in hierarchical HetNet against traditional HetNet. Simulation results show that D2D communication offers much higher spectral efficiency as compared to traditional HetNet

MONITORING OF ACADEMIC AND NON-ACADEMIC FIELDS IN HIGHER EDUCATION

This research aims to present the implementation of academic and non-academic Monitoring in higher education institutions using the literature review method as a source of information. Monitoring in both academic and non-academic fields in higher education is crucial to ensure that the standards of education and educational services provided are met. In the academic field, Monitoring is carried out to ensure that the learning process is effective, the teaching materials are of high quality, and the lecturers have adequate competencies. Meanwhile, in the non-academic field, Monitoring is conducted to ensure that campus security is guaranteed, educational facilities and infrastructure are adequate, and student involvement in campus activities is well-maintained. To improve the effectiveness of Monitoring in both academic and non-academic fields in higher education, universities can implement new strategies and innovations such as utilizing technology, developing evaluation instruments, and increasing student involvement in the Monitoring process. Effective Monitoring will have positive impacts such as improving the quality of education, student satisfaction, lecturer professionalism, campus security, and student involvement in campus activities. Research has shown that effective Monitoring in both academic and non-academic fields in higher education has positive implications for improving the quality of education and educational services. Furthermore, effective Monitoring can positively impact students, lecturers, and the wider community. Therefore, it is important for universities to carry out effective Monitoring in both academic and non-academic fields to ensure that all education and educational services processes meet the established quality standards

Assessment of Reliability and Availability of Series-Parallel Sub-Systems

The paper presents the explicit expressions for measuring reliability parameter  of systems, Graphs were plotted to highlight important results. Results have shown that measures of system effectiveness such MTSF, system availability and profit increases with repair rates and decreases with failure rates.The developed model helps in determining the optimal maintenance strategies which ensure the maximum overall availability of the system. The optimum values of failure and repair rates for each subsystem were given. It is observed that the first subsystem is having the maximum availability with (97%). The optimum values of failure and repair rates for maximum availability level for each subsystem is also shown. Keywords: Mean time to system failure, Availability, Reliability, Maintenance and Subsystem

Desain Kontroler PID-Genetic Algorithm untuk Sistem Pengaturan Level Air Steam Drum pada Pembangkit Listrik Tenaga Uap (PLTU)

Perubahan laju aliran uap menimbulkan gangguan pada sistem pengaturan level air steam drum. Level air dijaga pada titik tengah ketinggian drum atau disebut Normally Water Level (NWL), agar uap yang dihasilkan memenuhi spesifikasi serta tidak merusak peralatan pada pembangkit. Pada umumnya, sistem pengaturan level menggunakan kontroler PID konvensional. Namun, adanya gangguan dapat menyebabkan performa sistem dengan kontroler PID konvensional tidak mampu memenuhi spesifikasi. Kontroler PID-Genetic Algorithm (PID-GA) diterapkan untuk mengatur level air steam drum agar berada pada titik NWL ketika terdapat gangguan. Sistem pengaturan menggunakan kontroler PID-GA mampu meredam gangguan berupa beban minimal, nominal, dan maksimal, yaitu dengan perturbation peak masing-masing sebesar 0,18 m; 0,22 m; dan 0,26 m

Structural basis of mitochondrial receptor binding and constriction by DRP1.

Mitochondrial inheritance, genome maintenance and metabolic adaptation depend on organelle fission by dynamin-related protein 1 (DRP1) and its mitochondrial receptors. DRP1 receptors include the paralogues mitochondrial dynamics proteins of 49 and 51 kDa (MID49 and MID51) and mitochondrial fission factor (MFF); however, the mechanisms by which these proteins recruit and regulate DRP1 are unknown. Here we present a cryo-electron microscopy structure of full-length human DRP1 co-assembled with MID49 and an analysis of structure- and disease-based mutations. We report that GTP induces a marked elongation and rotation of the GTPase domain, bundle-signalling element and connecting hinge loops of DRP1. In this conformation, a network of multivalent interactions promotes the polymerization of a linear DRP1 filament with MID49 or MID51. After co-assembly, GTP hydrolysis and exchange lead to MID receptor dissociation, filament shortening and curling of DRP1 oligomers into constricted and closed rings. Together, these views of full-length, receptor- and nucleotide-bound conformations reveal how DRP1 performs mechanical work through nucleotide-driven allostery

Respons Pertumbuhan Dan Produksi Beberapa Varietas Tomat (Lycopersicum Esculentum L.) Dataran Rendah Terhadap Pemberian Pupuk Kandang Ayam

The purpose of the study was to determine the growth response and yield of some varieties oflowland tomato (Lycopersicum esculentum L.) under application of chicken manure. The researchwas conducted at Pasar I Tanjung Sari, Medan, of 25 meters above sea level, from June until August2013. The research design is a randomized block design with two factors, tomato varieties; Rempai,Vida and Super King, and chicken manure\u27s dosages; 0, 250, 500 and 750 g/polybag. Parametersobserved were plant height (cm), the number of fruit per plant, the number of bunches, the numberof fruit per bunch, average fruit weight (g) and heritability. The results showed that tomato varietieshave significant different on plant height, average fruit weight, the number of bunches, the numberof fruit per plant and the number of fruit per bunch, dosage of chicken manure showed significantparameters plan height, the numberof bunches and the number of fruit per bunch. Interaction of bothtreatments gave significant different on plant height, the number of bunches, the number of fruit perplant and the number of fruit per bunch