http://dspace.daffodilvarsity.edu.bd:8080/handle/123456789/206 2026-04-23T16:44:17Z http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/560 Waiting Line System in Health Sector of Bangladesh: The Case of Dental Care Services in Dhaka City Rahman, Mohammad Anisur; Parvez, Mahbub Waiting is inevitable in any service organization. Hence queues are formed. A long queue makes customer dissatisfied whereas increasing server to decrease the length of a queue requires costs. Waiting Line Theory provides a platform to that notion. The health sector of Bangladesh has been facing a bad experience for any citizen of Bangladesh. One of the reasons behind this is the queuing system prevailing in this sector. This paper presents an investigation into the prevailing queuing system in the private practices of Dhaka city. On the basis of investigation suggestions are put forward to improve the situation. 2006-07-01T00:00:00Z http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/559 The Serial Cartel: A Mathematical Model of Taxicab Services Market Alam, S.M. Ikhtiar In many developing countries and in some small cities in many developed countries, we find taxicabs without meters. These taxicab drivers sometimes form a cartel to avoid competition among themselves. They stand in a queue serially one by one. Only the first driver in the queue can pick up a passenger. The second driver will wait until the first driver leaves the queue. That is, these taxicab operators offer their services serially one by one. They are free to quote any price for a trip they want and can wait as long as they want to get an acceptable passenger. But if they wait, they incur a waiting cost. If a driver quotes a price and the passenger does not accept it and leaves the market or waits for the next cab, then the driver has to wait to get another passenger and as a result, his waiting cost increases. Such a cartel can be best described as a Serial Cartel. A serial cartel can be of two types on the basis of its continuity: (1) Discontinuous Serial Cartel, and (2) Continuous Serial Cartel. Discontinuous serial cartels are formed where demand is temporary. On the other hand, continuous serial cartels are formed where demand is permanent. These serial cartels have many features which are not present in other forms of cartels available in the existing literature. This paper presents two models of serial cartels of taxicab services market ⎯ one is a Discontinuous Serial Cartel Model, and the other one is a Continuous Serial Cartel Model. The two models are based on some plausible assumptions and two hypotheses about the willingness of passengers to pay for taxicab services. The models use differentiable negative exponential probability distribution functions to measure the willingness of the passengers. It is found that the equilibrium price, supply function, optimal size of a serial cartel, entry decision of a driver, and welfare effects of these serial cartels are totally different from the basic features of the centralized and market sharing cartels. 2006-07-01T00:00:00Z http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/558 Strengths and Limitations of Different Teaching Modes: A Comparative Study Saha, Mili; Talukdar, Md. Ali Rezwan Whether in language teaching or elsewhere, sustainable attainment of a pedagogical goal is closely related to a successful teaching mode. In a bid to have a gambit in a teaching procedure with a proper choice of a teaching mode, a teacher is expected to be well acquainted with the strengths and limitations of the prevailing teaching modes. Regarding this, over the years researchers have made efforts in exploring the immense ideological horizons, while in our country, still, lecture mode is the most commonly found one. Along with making thorough study of different aspects of various teaching modes, this current study scrutinizes some practical cases and examples in the academic context of Bangladesh. It attempts to recommend the optimum success level of lecture mode and to which extent lecture mode needs to be alternated or to be assimilated with others as well as how to minimize the weakness of it and ensure the maximum potentiality of the other teaching modes, basing on the established ideas in this field and the empirical studies done by these authors. 2006-07-01T00:00:00Z http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/557 Second Order Biases and Mean Squared Errors of Some Estimators Using Single Auxiliary Variable Hossain, M. I.; Rahman, Masud Ibn; Tareq, Muhammad The ratio, product, chain ratio, chain product, chain regression and ratio-cum product estimators have been considered by Chand (1975), Kiregyera (1980, 1984), Upadhyaya et. al. (1990, 1992), Srivastava et. al. (1990), Prasad et. al. (1992), Sahoo and Sahoo (1993), Singh (1993). Most of them discussed these estimators along with their first order bias and mean square error. In this paper, we have tried to find out the second order biases and mean square errors of these estimators based on simple random sampling. Finally, we have compared the performance of these estimators with some numerical illustration.s. 2006-07-01T00:00:00Z