Dissertation Information for Hong Xia NAME: - Hong Xia
DEGREE:
- Ph.D.
DISCIPLINE:
- Library and Information Science
SCHOOL:
- University of North Texas (USA) (1996)
ADVISORS: - Donald B. Cleveland
COMMITTEE MEMBERS: - Ana D. Cleveland - Kathleen Swigger - Raymond F. von Dran - Howard Clayton
MPACT Status: Fully Complete
Title: Library CD-ROM LAN system performance and patron use: A computer simulation model
Abstract: In this study, a computer simulation model for library CD-ROM LAN systems was created. Using this model, the system optimization problems were examined. The simulation model imitated the process of the actual decision variables changing their values and generated the corresponding results. Under a certain system environment, if the values of decision variables are changing, the system performances are getting changed also. This study investigated these relationships with the created model.
The system users' interarrival time, service time, and other relevant data were collected on randomly selected days in a university library. For data collection, both of the observation and the system automatic metering software were used. According to the collected data, a discrete events simulation model was created with GPSS/H.
The simulation model was proven valid and accurate by a pilot test and by the calculation with queuing theory. Statistical tests were used for data comparison and analysis. In addition, animation technique was used to show the simulation process by using Proof Animation. By this technique, the simulation process was monitored on the screen.
According to the simulation model output, three relationship formulas were derived: (1) The utilization of CD-ROM workstations and the number of the workstations: $U = -0.052S + 1.132$ where U is the utilization, S is the number of the workstations (S $>$ 3). (2) The CD-ROM users' waiting rate and the number of workstations: $W\sb{r} = 0.0014\* e\sp{61.85/S}$ where W$\sb{r}$% is the waiting rate, S is the number of workstations (S $>$ 3). (3) If a user entered the waiting line, the waiting time in the queue and the number of workstations. $W\sb{t} = 0.021\* e\sp{36.44/S}$ where W$\sb{t}$ is users' waiting time, S is the number of workstations (S $>$ 3).
Based on the collected data, descriptive statistics were provided. The affection of workstations increasing to the utilization of librarians was also estimated.
Further studies could separate the whole day into several segments of time in order to get more accurate interarrival time distributions for model refining.
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MPACT Scores for Hong Xia A = 0
C = 0
A+C = 0
T = 0
G = 0
W = 0
TD = 0
TA = 0
calculated 2008-01-31 06:21:08
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