Overrun Methods and Resource Holding Times for Hierarchical Scheduling of Semi-Independent Real-Time Systems

Behnam, M.,Nolte, T.,Sjodin, M.,Insik Shin IEEE 2010 IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS - Vol.6 No.1

<P>The hierarchical scheduling framework (HSF) has been introduced as a design-time framework to enable compositional schedulability analysis of embedded software systems with real-time properties. In this paper, a software system consists of a number of semi-independent components called subsystems. Subsystems are developed independently and later integrated to form a system. To support this design process, in the paper, the proposed methods allow non-intrusive configuration and tuning of subsystem timing-behavior via subsystem interfaces for selecting scheduling parameters. This paper considers three methods to handle overruns due to resource sharing between subsystems in the HSF. For each one of these three overrun methods corresponding scheduling algorithms and associated schedulability analysis are presented together with analysis that shows under what circumstances one or the other is preferred. The analysis is generalized to allow for both fixed priority scheduling (FPS) and earliest deadline first (EDF) scheduling. Also, a further contribution of the paper is the technique of calculating resource-holding times within the framework under different scheduling algorithms; the resource holding times being an important parameter in the global schedulability analysis.</P>

A High Current Efficiency CMOS LDO Regulator with Low Power Consumption and Small Output Voltage Variation

Behnam Samadpoor Rikan,Hamed Abbasizadeh,강지훈,이강윤 한국전기전자학회 2014 전기전자학회논문지 Vol.18 No.1

In this paper we present an LDO based on an error amplifier. The designed error amplifier has a gain of 89.93dB at low frequencies. This amplifier’s Bandwidth is 50.8MHz and its phase margin is 59.2˚. Also we proposed a BGR. This BGR has a low output variation with temperature and its PSRR at 1 KHz is -71.5dB. For a temperature variation from -40˚C to 125˚C we have just 9.4mV variation in 3.3V LDO output. Also it is stable for a wide range of output load currents [0-200mA] and a 1µF output capacitor and its line regulation and especially load regulation is very small comparing other papers. The PSRR of proposed LDO is -61.16dB at 1 KHz. Also we designed it for several output voltages by using a ladder of resistors, transmission gates and a decoder. Low power consumption is the other superiority of this LDO which is just 1.55mW in full load. The circuit was designed in 0.35µm CMOS process.

Low Power Class AB-B Buffer Amplifier for Reference Voltage Generator in SAR ADCs

Behnam Samadpoor Rikan,Hamed Abbasizadeh,Sung-Jin Kim,Dong-Soo Lee,Kang-Yoon Lee 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6

Effect of fiber reinforcing on instantaneous deflection of self-compacting concrete one-way slabs under early-age loading

Behnam Vakhshouri,Shami Nejadi 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.2

The Early-age construction loading and changing properties of concrete, especially in the multi-story structures can affect the slab deflection, significantly. Based on previously conducted experiment on eight simply-supported one-way slabs this paper investigates the effect of concrete type, fiber type and content, loading value, cracking moment, ultimate moment and applied moment on the instantaneous deflection of Self-Compacting Concrete (SCC) slabs. Two distinct loading levels equal to 30% and 40% of the ultimate capacity of the slab section were applied on the slabs at the age of 14 days. A wide range of the existing models of the effective moment of inertia which are mainly developed for conventional concrete elements, were investigated. Comparison of the experimental deflection values with predictions of the existing models shows considerable differences between the recorded and estimated instantaneous deflection of SCC slabs. Calculated elastic deflection of slabs at the ages of 14 and 28 days were also compared with the experimental deflection of slabs. Based on sensitivity analysis of the effective parameters, a new model is proposed and verified to predict the effective moment of inertia in SCC slabs with and without fiber reinforcing under two different loading levels at the age of 14 days.

Free vibration analysis of tapered FRP transmission poles with flexible joint by finite element method

Behnam Saboori,Seyed Mohammad Reza Khalili 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.3

Since relatively low elasticity modulus of the FRP materials results in lower natural frequencies, it is necessary to study the free vibration of FRP transmission poles. In this paper, the free vibration of tapered FRP transmission poles with thin-walled circular cross-section is investigated by a tapered beam element. To model the flexible joints of the modular poles, a rotational spring model is used. Modal analysis is performed for typical FRP poles with/without joint and they are also modeled by ANSYS commercial finite element software. There is a good correlation between the results of the tapered beam finite element model and those obtained from ANSYS as well as the existing experimental results. The effects of different geometries, material lay-ups, concentrated masses at the pole tip, and joint flexibilities are evaluated. Moreover, it is concluded that using tougher fibres at the inner and outer layers of the cross-section, results in higher natural frequencies, significantly.

A novel missense mutation in the GNE gene in an Iranian patient with hereditary inclusion body myopathy

Behnam, Mahdiyeh,Jin-Hong, Shin,Kim, Dae-Seong,Basiri, Keivan,Nilipour, Yalda,Sedghi, Maryam Medknow PublicationsMedia Pvt Ltd 2014 Journal of research in medical sciences Vol.19 No.8

<P>Hereditary inclusion body myopathy (hIBM) is an adult-onset hereditary myopathy, usually with distal onset and quadriceps sparing. This myopathy is autosomal recessive and associated to UPD-N-acetylglucosamine-2-epimerase/N-acetylmannosamine kinase (GNE) gene mutations. In this study, we report a novel GNE homozygous point mutation c.1834T>G that results in amino acid substitution of cysteine 612 to glutamine in an Iranian patient. This mutation is located in exon 10 within the kinase domain of the protein.</P>

Vibration analysis of piezoelectric nanowires with surface and small scale effects

Behnam Gheshlaghi,Seyyed M. Hasheminejad 한국물리학회 2012 Current Applied Physics Vol.12 No.4

An analytical model for predicting surface effects on the free transverse vibrations of piezoelectric nanowires (NWs) is developed based on the non-local Euler-Bernoulli beam theory. The governing equation of motion for the piezoelectric NW with consideration of both surface and non-local effects is initially obtained, and the exact expressions for the natural frequencies and the fundamental buckling voltage are derived for simple support conditions. In addition, an explicit relationship between the residual surface tension and the small scale parameter of the piezoelectric NW, in terms of the critical electric potential at which the axial buckling occurs, is offered. Accordingly, a design chart is presented which may assist in experimental characterization of the mechanical properties of piezoelectric NWbased devices.

Statistical Analysis of Lightning Electric Field Measured under Malaysian Condition

Behnam Salimi,Kamyar Mehranzamir,Zulkurnain Abdul-Malek 한국기상학회 2014 Asia-Pacific Journal of Atmospheric Sciences Vol.50 No.2

Lightning is an electrical discharge during thunderstormsthat can be either within clouds (Inter-Cloud), or between clouds andground (Cloud-Ground). The Lightning characteristics and their statisticalinformation are the foundation for the design of lightningprotection system as well as for the calculation of lightning radiatedfields. Nowadays, there are various techniques to detect lightningsignals and to determine various parameters produced by a lightningflash. Each technique provides its own claimed performances. In thispaper, the characteristics of captured broadband electric fields generatedby cloud-to-ground lightning discharges in South of Malaysiaare analyzed. A total of 130 cloud-to-ground lightning flashes from 3separate thunderstorm events (each event lasts for about 4-5 hours)were examined. Statistical analyses of the following signal parameterswere presented: preliminary breakdown pulse train time duration, timeinterval between preliminary breakdowns and return stroke, multiplicityof stroke, and percentages of single stroke only. The BIL modelis also introduced to characterize the lightning signature patterns. Observations on the statistical analyses show that about 79% of lightningsignals fit well with the BIL model. The maximum and minimumof preliminary breakdown time duration of the observed lightningsignals are 84 ms and 560 us, respectively. The findings of the statisticalresults show that 7.6% of the flashes were single stroke flashes,and the maximum number of strokes recorded was 14 multiple strokesper flash. A preliminary breakdown signature in more than 95% of theflashes can be identified.

Oil Spill Four-Class Classification Using UAVSAR Polarimetric Data

Behnam Hassani,Mahmod Reza Sahebi,Reza Mohammadi Asiyabi 한국해양과학기술원 2020 Ocean science journal Vol.55 No.3

Oil pollution of oceans from various sources is a devastating environmental problem and immediate detection of oil spills is crucial. Remote sensing techniques have provided an unprecedented opportunity for early oil spill detection and classification with an easy, quick, and cheap approach. Moreover, Fully Polarimetric Synthetic Aperture Radar (PolSAR) data with unique capabilities and informative features is an immense data source for oil spill detection on large scales. The objective of the present study is to utilize PolSAR data not only for oil spill detection, but also to classify the detected oil spill in the ocean into four classes: thick oil, thin oil, oil/water mixture, and clear water. In this study, numerous polarimetric decomposition parameters and texture features are extracted from the PolSAR image. A two-phase feature selection method, manually selection based on oil and water surface backscattering behavior and an optimization algorithm, has been employed on the extracted features to select the optimum feature set. The selected feature set has been used to classify the PolSAR image into oil and water classes. Moreover, the high sensitivity and discriminative power of the validation PolSAR dataset, UAVSAR L-band quad-pol data, is exploited by classifying the image into four classes. Remarkable acquired classification accuracies of 90.21% and 85.41% and Kappa coefficient of 0.8052 and 0.7905 for two-class and four-class classifications, respectively, demonstrate the robustness and high potential of the proposed methodology for oil spill detection and classification.

Resource Management of IaaS Providers in Cloud Federation

Behnam Bagheri Ghavam Abadi,Mostafa Ghobaei Arani 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.5

With the increasing use of cloud services, for both providers and users, saving energy and using needed resources regardless of time and place have got outmost importance. Resource provisioning in the cloud providers has come along availability of workloads in a given time. Most cloud providers conduct inquiries with a limited amount of resources that may be cause to reject the request of customers at the peak of workloads. Cloud federation is an approach to share resources, enhance the scalability and availability. High energy consumption is one of the current challenges for cloud providers; also it should be discussed and researched about providers’ profit as an important issue. We have presented an approach in this paper to reduce power consumption for IaaS Providers, by choosing the most appropriate host and allocating the best virtual machine which leads to satisfy users requests, save energy and reduce the cost of resources. Simulation results show that the proposed approach, compared to the other similar approaches, causes to increase utilization and turns off idle servers to decrease consumed power which followed by an increase in providers’ profit.