Nonparametric Phenotypic Stability Analysis in Advanced Barley (Hordeum vulgare L.) Genotypes

Moslem Abdipour,Behrouz Vaezi,Mehdi Younessi-Hamzekhanlu,Seyyed Hamid Reza Ramazani 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.4

The development of genotypes with adaptation to a wide range of environments is one of the most important goals of plant breeding programs. In order to compare nonparametric stability measures and to identify promising high-yield and stable barley (Hordeum vulgare L.), 20 barley genotypes selected from the Iran/ICARDA joint project and grown in nine environments during 2009-11 in Iran. Four nonparametric statistical tests of significance for genotype × environment (GE) interaction and 10 nonparametric measures of stability were used to identify stable genotypes in nine environments. Results of nonparametric tests of G×E interaction (Kubinger, Hildebrand, and Kroon/ Laan) and a combined ANOVA across environments, indicated the presence of both crossover and non-crossover interactions. Also, only TOP and rank-sum values were positively associated with high yield. Thus, in the simultaneous selection for high yield and stability, only the rank-sum and TOP methods were useful in terms of the principal component analysis results, and correlation analysis of nonparametric stability statistics and yield. According to these stability parameters (TOP and rank-sum), three genotypes (G13, G12, and G17) were the most stable for grain yield. The results also revealed that based on nonparametric test results, stability could be classified into three groups, according to agronomic and biological concepts of stability.

Two-Microphone Binary Mask Speech Enhancement in Diffuse and Directional Noise Fields

Roohollah Abdipour,Ahmad Akbari,Mohsen Rahmani 한국전자통신연구원 2014 ETRI Journal Vol.36 No.5

Two-microphone binary mask speech enhancement(2mBMSE) has been of particular interest in recentliterature and has shown promising results. Current2mBMSE systems rely on spatial cues of speech and noisesources. Although these cues are helpful for directionalnoise sources, they lose their efficiency in diffuse noisefields. We propose a new system that is effective in bothdirectional and diffuse noise conditions. The systemexploits two features. The first determines whether a giventime–frequency (T–F) unit of the input spectrum isdominated by a diffuse or directional source. A diffusesignal is certainly a noise signal, but a directional signalcould correspond to a noise or speech source. The secondfeature discriminates between T–F units dominated byspeech or directional noise signals. Speech enhancement isperformed using a binary mask, calculated based on theproposed features. In both directional and diffuse noisefields, the proposed system segregates speech T–F unitswith hit rates above 85%. It outperforms previoussolutions in terms of signal-to-noise ratio and perceptualevaluation of speech quality improvement, especially indiffuse noise conditions.

Design and Simulation of a Reflectarray Antenna using New Cell for Different Beam Angles

Iman Aryanian,Abdolali Abdipour,Gholamreza Moradi 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.6

In this paper a new cell is proposed for reflectarray antenna and is used to design the antenna to obtain to maximum gain and efficiency using phase synthesis in a frequency band of 11 GHz up to 11.7 GHz for different beam angles. The proposed cell is a double ring of hexagon which introduces multiple resonances which can provide more than 360 degrees phase variation by changing the loop size. Design method is based on phase-only algorithm where amplitude of the field on the reflectarray surface is forced by the feed. A 1.2 m reflectarray is designed for different beam directions. The results show maximum directivity of 42 dB and maximum efficiency of 73% for the required bandwidth. Focal length is 1.5 m which is set for maximum efficiency.

Characterization of Effective Capacity in Antenna Selection MIMO Systems

Lari, Mohammad,Mohammadi, Abbas,Abdipour, Abdolali,Lee, Inkyu The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.5

In this paper, the effective capacity of a multiple-input multiple-output (MIMO) system in two different cases with receive antenna selection (RAS) and transmit antenna selection (TAS) schemes is investigated. A closed-form solution for the maximum constant arrival rate of this network with statistical delay quality of service (QoS) constraint is extracted in the quasi-static fading channel. This study is conducted in two different cases.When channel state information (CSI) is not available at the MIMO transmitter, implementation of TAS is difficult. Therefore, RAS scheme is employed and one antenna with the maximum instantaneous signal to noise ratio is chosen at the receiver. On the other hand, when CSI is available at the transmitter, TAS scheme is executed. In this case, one antenna is selected at the transmitter. Moreover, an optimal power-control policy is applied to the selected antenna and the effective capacity of the MIMO system is derived. Finally, this optimal power adaptation and the effective capacity are investigated in two asymptotic cases with the loose and strict QoS requirements. In particular, we show that in the TAS scheme with the loose QoS restriction, the effective capacity converges to the ergodic capacity. Then, an exact closed-form solution is obtained for the ergodic capacity of the channel here.

Preparation of MWCNT/PDMS Conductive Micro-Patterned Nanocomposites

Saeid Aslnejad,Morteza Nasiri,Farhang Abbasi,Hamed Abdipour 한국고분자학회 2020 Macromolecular Research Vol.28 No.8

Conductive multi-walled carbon nanotube (MWCNT)/polydimethylsiloxane (PDMS) nanocomposites were prepared via solution method and their conductive micro-patterns were made using the doctor blade technique. The prepared patterns were characterized via scanning electron microscopy (SEM), cyclic voltammetry, and four-point probe conductivity meter. SEM images of the cross-sections of micro-patterns revealed that by increasing MWCNT concentration from 5 to 10%, while the dense and smooth bulk structure converted to a brittle one, their conductivities raised from 0.07 up to 0.33 S/cm. These micro-patterns preserved their conductivities under high bending cycles except for high MWCNT loading which loses almost half of its conductivity. The cyclic voltammetry analyses showed that MWCNT/ PDMS conductive micro-patterns had supercapacitor properties. The specific capacitance of the composite containing 10 wt% of MWCNT was 0.35 F/g. These nanocomposites can be used in cochlear implants due to their high conductivities. Their low working voltages ensure the safety of the neural tissues.

Characterization of Effective Capacity in Antenna Selection MIMO Systems

Mohammad Lari,Abbas Mohammadi,Abdolali Abdipour,이인규 한국통신학회 2013 Journal of communications and networks Vol.15 No.5

In this paper, the effective capacity of a multiple-inputmultiple-output (MIMO) system in two different cases with receiveantenna selection (RAS) and transmit antenna selection (TAS)schemes is investigated. A closed-form solution for the maximumconstant arrival rate of this network with statistical delay qualityof service (QoS) constraint is extracted in the quasi-static fadingchannel. This study is conducted in two different cases.When channelstate information (CSI) is not available at the MIMO transmitter,implementation of TAS is difficult. Therefore, RAS scheme isemployed and one antenna with the maximum instantaneous signalto noise ratio is chosen at the receiver. On the other hand, whenCSI is available at the transmitter, TAS scheme is executed. In thiscase, one antenna is selected at the transmitter. Moreover, an optimalpower-control policy is applied to the selected antenna and theeffective capacity of the MIMO system is derived. Finally, this optimalpower adaptation and the effective capacity are investigatedin two asymptotic cases with the loose and strict QoS requirements. In particular, we show that in the TAS scheme with the loose QoSrestriction, the effective capacity converges to the ergodic capacity. Then, an exact closed-form solution is obtained for the ergodiccapacity of the channel here.