Arts, Sciences and Technology University in Lebanon

www.aul.edu.lb/
Mount Lebanon, Lebanon

Arts, science and Technology University in Lebanon , is an independent and nondenominational Lebanese higher education institution with undergraduate and graduate degree programs.The main campus of the University is in Cola, Beirut. AUL has a branch in Jadra, south of Beirut and four study centers in Sin el Fil, Qalamoun - North Lebanon, Kaslik, and Chtoura. Wikipedia.

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Harmouch A.,Lebanese University | Hassoun I.,Al-Manar University of Tripoli | El Sayed Ahmad A.,Arts, Sciences and Technology University in Lebanon
2016 IEEE Middle East Conference on Antennas and Propagation, MECAP 2016 | Year: 2016

This paper describes the design and analysis of a multi-resonant compact patch antenna with fractal slots on the basis of Smith Chart geometry for indoor communication systems. A 60mm × 60mm × 1mm single patch antenna with periodic fractals in the form of combined r and x circles is capable of resonating at some desired sub-bands starting from LTE to WI-MAX with good enough directional characteristics greater than 3 dB in average within the whole frequency band. The dielectric material used for the proposed Microstrip patch antenna is Rogers TMM4 with dielectric constant of 4.5 and the patch is made up of perfect electric conductor (PEC). The proposed fractal geometry possesses multiband behavior at 0.7 GHz, 1.15 GHz, 1.8 GHz, 2.4 GHz, 3.7 GHz, 5.2 GHz and 5.8 GHz. In comparison with the already existing antenna systems in the wireless market for similar purposes, the proposed antenna has considerably shown better performance and supplementary compactness which makes it competitive among other antenna models. © 2016 IEEE.


Taki H.,Lebanese University | Taki H.,CNRS Communication and Information Sciences Laboratories | Azou S.,CNRS Communication and Information Sciences Laboratories | Hamie A.,Lebanese University | And 4 more authors.
Optics Communications | Year: 2017

In this paper, we investigate the usage of SOA for reach extension of an impulse radio over fiber system. Operating in the saturated regime translates into strong nonlinearities and spectral distortions, which drops the power efficiency of the propagated pulses. After studying the SOA response versus operating conditions, we have enhanced the system performance by applying simple analog pre-distortion schemes for various derivatives of the Gaussian pulse and their combination. A novel pulse shape has also been designed by linearly combining three basic Gaussian pulses, offering a very good spectral efficiency (<55%) for a high power (0 dBm) at the amplifier input. Furthermore, the potential of our technique has been examined considering a 1.5 Gbps-OOK and 0.75 Gbps-PPM modulation schemes. Pre-distortion proved an advantage for a large extension of optical link (150 km), with an inline amplification via SOA at 40 km. © 2016 Elsevier B.V.


Taki H.,Lebanese University | Taki H.,CNRS Communication and Information Sciences Laboratories | Azou S.,CNRS Communication and Information Sciences Laboratories | Hamie A.,Lebanese University | And 4 more authors.
Optical Fiber Technology | Year: 2017

In this study, we adopt a phaser-based processing to enhance the performance of impulse radio over fiber system utilizing SOA. The amplifier has been placed at a distance in the optical link, so as to extend the coverage area of proposed transceiver. Operating in the linear or saturation region for SOA, adds ASE noise or strong nonlinearities acting on the propagated pulses, respectively. Both lead to a degradation in the power efficiency and bit error rate performance. By applying up and down analog chirping technique, we have reduced the ASE power and nonlinearity simultaneously. Based on the 5th Gaussian pulse and Abraha's combination of doublets, a significant improvement has been achieved at extremely low and high input powers entering the amplifier (<−15 dBm and 0 dBm), recording a very good bit error rate performance and power efficiency. Better signal quality was observed after photo-detector, due to the fact that waveforms with lower frequency components are less affected by SOA nonlinearity. Our scheme has proved to be effective for 1 Gbps OOK and 0.5 Gbps PPM transmissions, while reaching a distance of 160 km in the optical fiber. © 2017 Elsevier Inc.


Termos H.,Brest National School of Engineering | Rampone T.,Brest National School of Engineering | Sharaiha A.,Brest National School of Engineering | Hamie A.,Arts, Sciences and Technology University in Lebanon | Alaeddine A.,Lebanese University
Journal of Lightwave Technology | Year: 2016

An all-optical sampling mixer based on a Semiconductor Optical Amplifier Mach-Zehnder Interferometer is performed. The frequency properties of a sampled signal are exploited to obtain both frequency up-conversion and frequency down-conversion of QPSK data. An optical pulse source, generating 10-ps width pulses at the repetition rate of 7.8 GHz used as a sampling signal, allows operation in the 0.5-39.5 GHz range. The conversion gain of the all-optical sampling mixer is measured over all the frequency range. It varies over this range from 20.4 to 0 dB for frequency down-conversion and from 15.5 to -13.4 dB for frequency up-conversion. QPSK data at symbol rates between 8 MSymb/s to 128 MSymb/s are frequency converted. The Error Vector Magnitude is used to evaluate the quality of the frequency conversion. Exploitable EVMs in the range from 14 to 27.4% are reached for frequency up-conversion to the higher target frequency for all the symbol rates. For down-conversion, the EVM varies from 6.7 to 29.2% at the symbol rate of 64 MSymb/s for all the frequency range. By using a differential configuration, the conversion gain is improved by 8.6 and 9 dB respectively for up-conversion and down-conversion operations. The benefit provided by the differential configuration leads to a better EVM. Its value is almost shifted by 11% for frequency up-conversion and frequency down-conversion of data at a symbol rate of 64 MSymb/s. © 1983-2012 IEEE.


Harmouch A.,Lebanese University | Harmouch W.,Lebanese University | El Sayed Ahmad A.,Arts, Sciences and Technology University in Lebanon | Kenaan M.,Al Kafaat University | Floc'h J.-M.,CNRS Institute of Electronics and Telecommunications, Rennes
Radioelectronics and Communications Systems | Year: 2017

This paper describes the design and analysis of a compact and efficient ultrawideband unidirectional printed antenna array for indoor applications.A12.2×6.3×1 cm antenna array is capable of covering an ultra-wide frequency band starting from LTE up to Wi-MAX with an average gain approaching 5 dBi over the entire bandwidth. In comparison with the already existing antenna systems in the wireless market for similar purposes, the proposed antenna has considerably better performance and supplementary compactness, which makes it competitive among other antenna models. Simulation results have also shown low cross polarization levels, where the sidelobe level was also minimized by introducing a special reflecting element in the designed model. Adopting the proposed antenna in indoor communication systems would surely enhance the quality of signal within the covered area as well as minimize the number of access points needed for a given network. © 2017, Allerton Press, Inc.


PubMed | Yuzuncu Yil University, Onikisubat Community Health Center, Arts, Sciences and Technology University in Lebanon and Kahramanmaras Sutcu Imam University
Type: Evaluation Studies | Journal: Nordic journal of psychiatry | Year: 2015

The aim of this study was to evaluate adult attention deficit and hyperactivity disorder (ADHD) in smokers, Maras powder users and non-users of tobacco products by using the Adult Attention Deficit and Hyperactivity Disorder Self-report Scale (ASRS).The study was performed on 446 males presenting to family health centers in Kahramanmara, Turkey. Of 446 participants, 104 were Maras powder users, 133 were smokers and 209 were volunteers not using any tobacco products. Data were collected with a questionnaire composed of questions about socio-demographic features and features of smoking and Maras powder use, and the Fagerstrm Nicotine Dependence Scale and the ASRS. P < 0.05 was considered significant.The mean age of the participants was 33.94 10.68 years (min = 18, max = 64). There was no significant difference in age between the study groups (P = 0.089). Thirty-one participants (7.0%) received scores higher than the cut-off value ( 14 points) for the short form of the ASRS. Twenty-one participants (4.7%) achieverd scores higher than the cut-off value ( 44 points) for the ASRS. The smokers received the highest scores of 8.42 3.79 for all the subscales of the short version of the ASRS, 26.87 10.46 for the ASRS, 12.57 6.47 for the attention deficit subscale and 14.30 5.35 for the hyperactivity and impulsivity subscale.Higher rates of the smokers and the Maras powder users had symptoms of ADHD. Considering nicotine may decrease symptoms of ADHD, it can be assumed that the rates of the smokers and Maras powder users with ADHD are higher.


Giacoumidis E.,Triangle Engineering | Jarajreh M.A.,Northumbria University | Sygletos S.,Triangle Engineering | Le S.T.,Triangle Engineering | And 7 more authors.
Optics Express | Year: 2014

A number of critical issues for dual-polarization single- and multi-band optical orthogonal-frequency division multiplexing (DPSB/ MB-OFDM) signals are analyzed in dispersion compensation fiber (DCF)-free long-haul links. For the first time, different DP crosstalk removal techniques are compared, the maximum transmission-reach is investigated, and the impact of subcarrier number and high-level modulation formats are explored thoroughly. It is shown, for a bit-error-rate (BER) of 10-3, 2000 km of quaternary phase-shift keying (QPSK) DP-MBOFDM transmission is feasible. At high launched optical powers (LOP), maximum-likelihood decoding can extend the LOP of 40 Gb/s QPSK DPSB- OFDM at 2000 km by 1.5 dB compared to zero-forcing. For a 100 Gb/s DP-MB-OFDM system, a high number of subcarriers contribute to improved BER but at the cost of digital signal processing computational complexity, whilst by adapting the cyclic prefix length the BER can be improved for a low number of subcarriers. In addition, when 16-quadrature amplitude modulation (16QAM) is employed the digital-toanalogue/ analogue-to-digital converter (DAC/ADC) bandwidth is relaxed with a degraded BER; while the 'circular' 8QAM is slightly superior to its 'rectangular' form. Finally, the transmission of wavelength-division multiplexing DP-MB-OFDM and single-carrier DP-QPSK is experimentally compared for up to 500 Gb/s showing great potential and similar performance at 1000 km DCF-free G.652 line. © 2014 Optical Society of America.


Hanna G.F.,ISL Business Consulting | Saleh Hammoud M.,Arts, Sciences and Technology University in Lebanon | Russo-Converso J.A.,Northcentral University
International Journal of Energy Economics and Policy | Year: 2014

Foreign direct investment is new phenomenon to Iraq, a post conflict country with abundance of natural resources. With dominant state-controlled public sector, attracting foreign investment is an added challenge to an economy devastated by years of wars. A qualitative case study was conducted to assess determinants of foreign direct investment in Iraq's energy sector. Data was collected from interviews with business and government subject matter experts, and a review of publically available documents. Lack of security, political instability, corruption, and inadequate government policies towards foreign direct investment as symptoms found and typically shared by other post-conflict countries. The persistence of violence was not seen as a deterrent; however, foreign direct investment activity in the energy sector was virtually limited to the semi-autonomous region of Kurdistan. Investments were either wholly-owned or joint-venture enterprises. Implications to other post conflict countries, using Kuwait and Nigeria as illustrative examples, are presented and recommendations made.


Hamie A.,Arts, Sciences and Technology University in Lebanon | Hamze M.,Arts, Sciences and Technology University in Lebanon | Hamze M.,Brest National School of Engineering | Wei J.L.,University of Cambridge | And 2 more authors.
Optics Express | Year: 2011

Extensive explorations are undertaken, for the first time, of the feasibility of utilizing quantum-dot semiconductor optical amplifier intensity modulators (QD-SOA-IMs) in cost-sensitive intensity-modulation and direct-detection (IMDD) passive optical network (PON) systems based on adaptively modulated optical orthogonal frequency division multiplexing (AMOOFDM). A theoretical QD-SOA-IM model is developed, based on which optimum QD-SOA-IM operating conditions are identified together with major physical mechanism considerably affecting the system performance. It is shown that, in comparison with previously reported SOA-IMs in similar transmission systems, QD-SOA-IMs cannot only considerably improve the AMOOFDM transmission performance but also broaden the dynamic range of optimum operating conditions. In particular, for achieving signal bit rates of >30Gb/s over >60km single mode fiber (SMF), QD-SOA-IMs offer a 10dB reduction in CW optical input powers injected into the modulators. In addition, QD-SOA-IMs can also be employed to compensate the chromatic dispersion effect. © 2011 Optical Society of America.


Madi A.,Arts, Sciences and Technology University in Lebanon | Zein O.K.,Arts, Sciences and Technology University in Lebanon | Kadry S.,Arts, Sciences and Technology University in Lebanon
International Journal of Software Engineering and its Applications | Year: 2013

Complexity is always considered as an undesired property in software since it is a fundamental reason of decreasing software quality. Measuring the complexity using some metrics is one of the important factors that were made by many research activities in order to avoid complex software. In this paper, we analyze the effectiveness of complexity in security, maintainability and errors prediction; we introduce the role of design phase in the software life cycle and the importance of the measurement in this level. We present a study of different software metrics that can be used to measure the complexity of a system during the design phase, and highlight the cyclomatic complexity metric introduced by McCabe which was studied extensively by most researchers. We also propose an improvement of cyclomatic complexity metric which aims to measure both the intra-modular and the inter-modular complexity of a system.

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