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Smoking and Associated Factors Among the Population Aged 40-64 in Shahroud, Iran
Hamrah, Mohammad Shoaib,Harun-Or-Rashid, Md.,Hirosawa, Tomoya,Sakamoto, Junichi,Hashemi, Hassan,Emamian, Mohammad Hassan,Shariati, Mohammad,Fotouhi, Akbar Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3
Background: Smoking is known as a major risk factor for different types of cancer, as well as cardiovascular disease. Its prevalence is increasing in developing countries. The aims of this study were to determine the prevalence of smoking and its associated factors among the population aged 40-64 years in the city of Shahroud which is a representative urban population in Iran. Materials and Methods: A cross-sectional population-based study with stratified random cluster sampling was conducted in 2009 as the first phase of Shahroud Eye Cohort Study. Of 6,311 people, 5,190 participated (82.2%). Information about smoking habit was obtained by face-to-face interview. Results: The overall prevalence of current tobacco smoking was 11.3% (95%CI: 10.5-12.3). It was significantly higher among males than females (25.7% and 0.71%, P<0.001). The prevalence of current cigarette smoking was 10.8% and 1.75% were past smokers. The smoking rate of water-pipe was 0.67%. Unemployed people smoked more than employed (OR=2.66, 95%CI: 1.38-5.14). Conclusions: The prevalence of smoking is low in Shahroud compared with other parts of Iran and other countries. Age, sex, job and marital status were associated with smoking. The low smoking rate among women may be attributed to cultural and social reasons.
Theoretical Studies on MXO4 (M=Li, Na, K and X=F, Cl, Br, I) Salt Ion Pairs
Mohammad Harun Or Rashid,Manik Kumer Ghosh,최철호 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
The series of alkali metal perhalogenates, MXO4 (M=Li, Na, K and X=F, Cl, Br, I) were theoretically studied with the help of MP2 methods. Bidentate as well as tridentate structures were found to be stable minima. The bidentate structures are becoming preferred as the size of halogen increases and as the size of metal decreases. Geometrically,the M-O and M-X distances of both bidentate and tridentate structures, increase with the size of metal. Generally, the M-O1 distances of tridentate forms are longer than the corresponding distances of bidentate forms, while the M-X distances of tridentate forms show the opposite trend. Similarly, the X-O bonds increase with the size of halogens except MFO4 pairs, where the X-O bonds are unusually long due to the enhanced oxygen-oxygen repulsions. In short,the relative energetics as well as the geometrical parameters are found to be strongly dependent on halogen and metal elements.
Mohammad Harun-or-Rashid,SK Phulia,Mir Md. Iqbal Hasan,Mohammad Musharraf Uddin Bhuiyan,Nasrin Sultana Juyena,Rakesh Kumar Sharma 한국동물생명공학회(구 한국동물번식학회) 2020 Journal of Animal Reproduction and Biotechnology Vol.35 No.1
The objective of this research work was to know ovarian dynamics and pregnancy rate of cyclic Murrah buffalo cows with induced estrus by administration of prostaglandin F2α (PGF2α) and timed artificial insemination (TAI) with frozen thawed semen. A total of 31 female buffaloes were selected for the study. The buffalos having matured CL observed by ultrasonography were given one intra muscular injection of cloprostenol 500 μg and TAI was performed using frozen thawed semen of Indian Murrah buffalo bull. Results showed that 90.32% (significantly, at p < 0.05) cows explore the sign of heat after injection of PG and 67.85% (significantly, at p < 0.05) cows were become pregnant out of 28 inseminated (TAI) cows. In the 28 inseminated (TAI) cows, average number of smaller and larger size of follicles were non-significantly (p > 0.05) higher at day 3 post PG injection, but the medium size of follicles was non-significantly (p > 0.05) higher at PG injection. At day 3 post PG injection the diameter of follicles was significantly (p < 0.05) higher, but the diameter of CL was significantly (p < 0.01) lower compared at PG injection. At PG injection the diameter of largest follicle was non-significantly differences (p > 0.05) in between pregnant and non-pregnant cows. But at day 3 post PG injection it was significantly (p < 0.01) higher in pregnant cows compared to non-pregnant cows. The number of small, medium, and large follicles at PG injection and at day 3 post PG injection were non-significantly (p > 0.05) difference in between pregnant and non-pregnant buffalo cows. Finally, it is concluded that the CL was effectively regresses and induced the sign of heat in buffalo cows and after AI the cows were become pregnant with significant rate. The study will help to the veterinarian and researcher to know the efficacy of PG injection and AI for reproductive efficiency in buffalo cows.
Unmanned coaxial rotor helicopter dynamics and system parameter estimation
Mohammad Harun-Or-Rashid,송준범,채상현,변영섭,강범수 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
A numerical model that estimates the parameters of a small, unmanned coaxial rotor helicopter with a takeoff mass of 11.9 kg was developed. The modeled coaxial rotor helicopter did not have any additional damping to its dynamics such as a stabilizer bar or externalgyro, which are common in commercial hobby helicopter models. Therefore, any sinusoidal actuator input from manual flight led to alarge deviation of attitude rates, resulting in uncontrollable situations. A feedback attitude controller was included during test flights andparameter estimation to address this problem. Time domain experimental data were used to help estimate and validate the parameters ofthe helicopter. Attitude responses predicted by the model show extremely small discrepancies with experimental data. Therefore, thedeveloped numerical model can be used for coaxial rotor helicopter controller design and other simulation purposes.
Mohammad Harun-Or-Rashid,Jun-Beom Song,Young-Seop Byun,Beom-Soo Kang 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.4
When the speed of a coaxial rotor helicopter in forward flight increases, the wake skew angle of the rotor increases and consequently the position of the vena contracta of the upper rotor with respect to the lower rotor changes. Considering ambient air and the effect of the upper rotor, this study proposes a nonuniform inflow model for the lower rotor of a coaxial rotor helicopter in forward flight. The total required power of the coaxial rotor system was compared against Dingeldein’s experimental data, and the results of the proposed model were well matched. A plant model was also developed from first principles for flight simulation, unknown parameter estimation and control analysis. The coaxial rotor helicopter used for this study was manufactured for surveillance and reconnaissance and does not have any stabilizer bar. Therefore, a feedback controller was included during flight test and parameter estimation to overcome unstable situations. Predicted responses of parameter estimation and validation show good agreement with experimental data. Therefore, the methodology described in this paper can be used to develop numerical plant model, study non-uniform inflow model, conduct performance analysis and parameter estimation of coaxial rotor as well as other rotorcrafts in forward flight.
Harun-Or-Rashid, Mohammad,Song, Jun-Beom,Byun, Young-Seop,Kang, Beom-Soo The Korean Society for Aeronautical and Space Scie 2015 International Journal of Aeronautical and Space Sc Vol.16 No.4
When the speed of a coaxial rotor helicopter in forward flight increases, the wake skew angle of the rotor increases and consequently the position of the vena contracta of the upper rotor with respect to the lower rotor changes. Considering ambient air and the effect of the upper rotor, this study proposes a nonuniform inflow model for the lower rotor of a coaxial rotor helicopter in forward flight. The total required power of the coaxial rotor system was compared against Dingeldein's experimental data, and the results of the proposed model were well matched. A plant model was also developed from first principles for flight simulation, unknown parameter estimation and control analysis. The coaxial rotor helicopter used for this study was manufactured for surveillance and reconnaissance and does not have any stabilizer bar. Therefore, a feedback controller was included during flight test and parameter estimation to overcome unstable situations. Predicted responses of parameter estimation and validation show good agreement with experimental data. Therefore, the methodology described in this paper can be used to develop numerical plant model, study non-uniform inflow model, conduct performance analysis and parameter estimation of coaxial rotor as well as other rotorcrafts in forward flight.
Theoretical Study of Cycloaddition Reactions of C<sub>60</sub> on the Si(100)-2×1 Surface
Rashid, Mohammad Harun Or,Lim, Chul-Tack,Choi, Cheol-Ho Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.6
Density functional theory was adopted to study the various surface products and their reaction channels focusing on the on-dimer configuration which has not been suggested before. Energetic results show that the most stable on-dimer configuration is the 6,6-[2+2] structure which resembles the typical [2+2] cycloaddition product. The 6,6-[2+2] product is also more stable than any other possible surface structures of inter-dimer configuration further suggesting its existence. Potential energy surface scan along various possible initial surface reactions show that some of the possible on-dimer surface products require virtually no reaction barrier indicating that initial population of on-dimer surface products is thermodynamically determined. Various surface isomerization reaction channels exist further facilitating thermal redistribution of the initial surface products.
System Identification and Parameter Estimation of a Multi-rotor Flying Machine
Mohammad Harun-Or-Rashid,Jun-Beom Song,Young-Seop Byun,Beom-Soo Kang 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
In this paper, system identification and parameter estimation of an unmanned quad-rotor helicopter are presented. Flight test of quad-rotor UAV was conducted and acquired time domain flight data was used for system identification in transfer function form. Estimated responses from the TF models show very small discrepancy against experimental data. For confirmation of the transfer function’s consistency validation task was also performed. A non-linear plant model was developed and different unknown parameters were estimated. The plant model can be used for dynamic behavior prediction of the quad-rotor aerial vehicle.
Theoretical Studies on MXO<sub>4</sub> (M=Li, Na, K and X=F, Cl, Br, I) Salt Ion Pairs
Rashid, Mohammad Harun Or,Ghosh, Manik Kumer,Choi, Cheol-Ho Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
The series of alkali metal perhalogenates, $MXO_4$ (M=Li, Na, K and X=F, Cl, Br, I) were theoretically studied with the help of MP2 methods. Bidentate as well as tridentate structures were found to be stable minima. The bidentate structures are becoming preferred as the size of halogen increases and as the size of metal decreases. Geometrically, the M-O and M-X distances of both bidentate and tridentate structures, increase with the size of metal. Generally, the M-$O_1$ distances of tridentate forms are longer than the corresponding distances of bidentate forms, while the M-X distances of tridentate forms show the opposite trend. Similarly, the X-O bonds increase with the size of halogens except $MXO_4$ pairs, where the X-O bonds are unusually long due to the enhanced oxygen-oxygen repulsions. In short, the relative energetics as well as the geometrical parameters are found to be strongly dependent on halogen and metal elements.