This page has only limited features, please log in for full access.

Unclaimed
Khalidur Rahman
Department of Statistics, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 16 April 2021 in European Journal of Investigation in Health, Psychology and Education
Reads 0
Downloads 0

The overlay of the COVID-19 pandemic on the pandemic of physical inactivity has become a great concern. Both types of pandemics can decrease the health protection capacity and consequently increase complexity in human lives. This cross-sectional study intended to examine changes in physical activity and sedentary behaviors during the COVID-19 pandemic among university students in a second-tier city of Bangladesh. Two hundred and nine students responded to an online questionnaire administered via Google Survey. In addition to descriptive statistics, parametric and non-parametric tests for comparing means, medians and distributions were used to assess differences in activity traits before and during the COVID-19 pandemic. Results show that the occurrence of COVID-19 has significantly reduced the practice of walking and physical activities among the students. They are commonly motivated by introjected regulation. Father’s occupation and the type of family of a student have significant influences on the total physical activity in either situation. Bangladeshi university students have, particularly, been perceived as not generally used to vigorous physical activities. They are inactive compared to students from other countries. Thus, the public health policymakers and the corresponding authority should inspire the students to be more physically active by implementing different strategies such as increasing bicycling and walking facilities on the campus.

ACS Style

Khalidur Rahman; Matteo Vandoni; Boris Cheval; Asaduzzaman; Mohammad Hasan; Sabbir Rahman. Exploring Two Pandemics in Academic Arena: Physical Activity and Sedentary Behaviors Profile of University Students in Bangladesh. European Journal of Investigation in Health, Psychology and Education 2021, 11, 358 -371.

AMA Style

Khalidur Rahman, Matteo Vandoni, Boris Cheval, Asaduzzaman, Mohammad Hasan, Sabbir Rahman. Exploring Two Pandemics in Academic Arena: Physical Activity and Sedentary Behaviors Profile of University Students in Bangladesh. European Journal of Investigation in Health, Psychology and Education. 2021; 11 (2):358-371.

Chicago/Turabian Style

Khalidur Rahman; Matteo Vandoni; Boris Cheval; Asaduzzaman; Mohammad Hasan; Sabbir Rahman. 2021. "Exploring Two Pandemics in Academic Arena: Physical Activity and Sedentary Behaviors Profile of University Students in Bangladesh." European Journal of Investigation in Health, Psychology and Education 11, no. 2: 358-371.

Original article
Published: 19 September 2020 in Sustainable Water Resources Management
Reads 0
Downloads 0

Water, the most naturally abundant and the simplest molecule on the earth, is crucial for the existence of all flora and fauna on this planet. Groundwater chemical composition can change the suitability of the aquifer system. The aim of the study was to provide an evaluation of water quality with respect to different water quality parameters in the north-east part of Bangladesh using multivariate techniques. It also tried to identify the vital sources that control the groundwater resources in the aquifer. All samples were collected during the pre-monsoon season in March 2019 from 20 pumps of Sylhet City Corporation area. Correlation analysis has been used to assess the overall groundwater quality and the degree of the linear relationship between parameters. Multivariate statistical techniques have been used to interpret the water quality of the selected pumps and to provide some meaningful results that are not possible while investigating the data at a glance. The average concentrations of major ions in groundwater of Sylhet City Corporation area are in the following order: cations—Magnesium (28.43) > Sodium (11.45) > Calcium (8.47) > Potassium (1.36); while, anions—Bicarbonate (87.70) > Chloride (37.20) > Sulfate (1.80) > Nitrate (0.95). The correlation matrix shows that the basic ionic chemistry is influenced by pH, EC, TDS, K+, Na+, Mg2+, and SO42−. These characteristics of the water samples indicate that, in addition to fresh recharge water of CaHCO3 type, the groundwater are dominated by the dolomite (CaMg(CO3)2), calcite (CaCO3) and halite (NaCl) rock-forming minerals. PCA extracted three components, which are accountable for the data composition explaining 71% of the total variance of the data set and allowed to set the selected parameters according to regular features as well as to evaluate the frequency of each group on the overall variation in water quality of Sylhet City Corporation area. The factors have been identified as “freshwater and halite minerals interaction”, “anthropogenic influences”, and “anthropogenic-rocks interaction effect”. Hierarchical cluster analysis grouped the 20 sampling stations into five groups, the values of pH and HCO3− concentration increase gradually from cluster 1 to cluster 5, i.e., from the eastern part to the western part of the city. The western part is relatively on the downward side and thus, the recharge water of CaHCO3 type is comparatively affluent in this area.

ACS Style

Mohammad Nayeem Hasan; Khalidur Rahman; Tajmunnaher; Mohammad Romel Bhuia. Assessment of ground water quality in the vicinity of Sylhet City, Bangladesh: a multivariate analysis. Sustainable Water Resources Management 2020, 6, 1 -16.

AMA Style

Mohammad Nayeem Hasan, Khalidur Rahman, Tajmunnaher, Mohammad Romel Bhuia. Assessment of ground water quality in the vicinity of Sylhet City, Bangladesh: a multivariate analysis. Sustainable Water Resources Management. 2020; 6 (5):1-16.

Chicago/Turabian Style

Mohammad Nayeem Hasan; Khalidur Rahman; Tajmunnaher; Mohammad Romel Bhuia. 2020. "Assessment of ground water quality in the vicinity of Sylhet City, Bangladesh: a multivariate analysis." Sustainable Water Resources Management 6, no. 5: 1-16.

Research article
Published: 21 July 2015 in PLOS ONE
Reads 0
Downloads 0

Pedestrian overflow causes queuing delay and in turn, is controlled by the capacity of a facility. Flow control or blocking control takes action to avoid queues from building up to extreme values. Thus, in this paper, the problem of pedestrian flow control in open outdoor walking facilities in equilibrium condition is investigated using M/M/c/K queuing models. State dependent service rate based on speed and density relationship is utilized. The effective rate of the Poisson arrival process to the facility is determined so as there is no overflow of pedestrians. In addition, the use of the state dependent queuing models to the design of the facilities and the effect of pedestrian personal capacity on the design and the traffic congestion are discussed. The study does not validate the sustainability of adaptation of Western design codes for the pedestrian facilities in the countries like Bangladesh.

ACS Style

Khalidur Rahman; Noraida Abdul Ghani; Anton Abdulbasah Kamil; Adli Mustafa; Ahmed Kabir Chowdhury. An M/M/c/K State-Dependent Model for Pedestrian Flow Control and Design of Facilities. PLOS ONE 2015, 10, e0133229 .

AMA Style

Khalidur Rahman, Noraida Abdul Ghani, Anton Abdulbasah Kamil, Adli Mustafa, Ahmed Kabir Chowdhury. An M/M/c/K State-Dependent Model for Pedestrian Flow Control and Design of Facilities. PLOS ONE. 2015; 10 (7):e0133229.

Chicago/Turabian Style

Khalidur Rahman; Noraida Abdul Ghani; Anton Abdulbasah Kamil; Adli Mustafa; Ahmed Kabir Chowdhury. 2015. "An M/M/c/K State-Dependent Model for Pedestrian Flow Control and Design of Facilities." PLOS ONE 10, no. 7: e0133229.

Validation study
Published: 15 May 2013 in PLOS ONE
Reads 0
Downloads 0

Pedestrian movements are the consequence of several complex and stochastic facts. The modelling of pedestrian movements and the ability to predict the travel time are useful for evaluating the performance of a pedestrian facility. However, only a few studies can be found that incorporate the design of the facility, local pedestrian body dimensions, the delay experienced by the pedestrians, and level of service to the pedestrian movements. In this paper, a queuing based analytical model is developed as a function of relevant determinants and functional factors to predict the travel time on pedestrian facilities. The model can be used to assess the overall serving rate or performance of a facility layout and correlate it to the level of service that is possible to provide the pedestrians. It has also the ability to provide a clear suggestion on the designing and sizing of pedestrian facilities. The model is empirically validated and is found to be a robust tool to understand how well a particular walking facility makes possible comfort and convenient pedestrian movements. The sensitivity analysis is also performed to see the impact of some crucial parameters of the developed model on the performance of pedestrian facilities

ACS Style

Khalidur Rahman; Noraida Abdul Ghani; Anton Abdulbasah Kamil; Adli Mustafa; Ahmed Kabir Chowdhury. Modelling Pedestrian Travel Time and the Design of Facilities: A Queuing Approach. PLOS ONE 2013, 8, e63503 .

AMA Style

Khalidur Rahman, Noraida Abdul Ghani, Anton Abdulbasah Kamil, Adli Mustafa, Ahmed Kabir Chowdhury. Modelling Pedestrian Travel Time and the Design of Facilities: A Queuing Approach. PLOS ONE. 2013; 8 (5):e63503.

Chicago/Turabian Style

Khalidur Rahman; Noraida Abdul Ghani; Anton Abdulbasah Kamil; Adli Mustafa; Ahmed Kabir Chowdhury. 2013. "Modelling Pedestrian Travel Time and the Design of Facilities: A Queuing Approach." PLOS ONE 8, no. 5: e63503.

Journal article
Published: 03 March 2013 in Modern Applied Science
Reads 0
Downloads 0

The proper estimation of pedestrian speed-flow-density relationships is of vital importance, because such relationships play an important role in developing useful tools for analysing and improving pedestrian facilities in terms of efficiency and safety. One of the major problems with previous macroscopic studies of pedestrian flow characteristics is that the relationships were established based on a model with specification errors that had been estimated by ordinary least squares (OLS). Thus, the validity of the relationships and conclusions drawn from those studies is open to question and should be examined further. In this study, pedestrian speed-flow-density relationships in Dhaka, Bangladesh, are estimated using a weighted regression method. The flows and speeds generated by the derived flow-density and speed-flow relationships based on the weighted regression method and the OLS method, separately, are compared with empirical values. The root mean square error is used as an evaluation criterion. In addition, the pedestrian characteristics of Dhaka are compared with those of other studies. The results indicate the existence of a probable bias in previous studies and an improvement in predictive power with the use of the weighted regression method. Pedestrian flows on the sidewalks in Dhaka have some particular characteristics that are not similar to the uninterrupted pedestrian flows in other countries. Since the weighted regression estimation techniques can mitigate a part of the OLS bias, such techniques could be incorporated in simulation packages to predict pedestrian flows and speeds as well as to design and analyse the capacity of a pedestrian facility precisely. The study also recommends refraining from the direct adoption of foreign design and parameters for pedestrian facilities in Dhaka.

ACS Style

Khalidur Rahman; Noraida Abdul Ghani; Anton Abdulbasah Kamil; Adli Mustafa. Weighted Regression Method for the Study of Pedestrian Flow Characteristics in Dhaka, Bangladesh. Modern Applied Science 2013, 7, 1 .

AMA Style

Khalidur Rahman, Noraida Abdul Ghani, Anton Abdulbasah Kamil, Adli Mustafa. Weighted Regression Method for the Study of Pedestrian Flow Characteristics in Dhaka, Bangladesh. Modern Applied Science. 2013; 7 (4):1.

Chicago/Turabian Style

Khalidur Rahman; Noraida Abdul Ghani; Anton Abdulbasah Kamil; Adli Mustafa. 2013. "Weighted Regression Method for the Study of Pedestrian Flow Characteristics in Dhaka, Bangladesh." Modern Applied Science 7, no. 4: 1.