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Performance analysis of the leaky bucket scheme with queue length dependent arrival rates
최두일,이상한 대한수학회 2006 대한수학회보 Vol.43 No.3
In this paper, we analyze a leaky bucket (LB) schemewith queue length dependent arrival rates. In other words, if thequeue length exceeds an appropriate threshold value on buer, thearrivals need to be controlled. In ATM networks, if the congestionoccurs, the input tracs must be controlled (reduced) for conges-tion resolution. By the bursty and correlated properties of tracs,the arrivals are assumed to follow a Markov-modulated Poisson pro-cess (MMPP). We derive the loss probability and the waiting timedistribution for arbitrary cell. The analysis is done by using theembedded Markov chain and supplementary variable method. Wealso present some numerical examples to show the eects of ourproposed LB scheme.
Analysis of queueing model with priority scheduling by supplementary variable method
최두일 한국전산응용수학회 2013 Journal of applied mathematics & informatics Vol.31 No.1
We analyze queueing model with priority scheduling by supplementaryvariable method. Customers are classified into two types (type-1 and type-2 ) according to their characteristics. Customers of eachtype arrive by independent Poisson processes, and all customers regardlessof type have same general service time. The service order of each typeis determined by the queue length of type-1 buffer. If the queue lengthof type-1 customer exceeds a threshold L, the service priority is given tothe type-1 customer. Otherwise, the service priority is given to type-2customer. Method of supplementary variable by remaining service timegives us information for queue length of two buffers. That is, we derive thedifferential difference equations for our queueing system. We obtain jointprobability generating function for two queue lengths and the remainingservice time. Also, the mean queue length of each buffer is derived.
최두일,윤태성 대한의용생체공학회 1987 의공학회지 Vol.8 No.2
In this study, basilar membrane motions and neural tuning responses are analysed with I-dimensional equations for cochlear fluid mechanics and an active cochlear model. The results are as follows. (1) The differences between basilar membrane motions in an active cochlear model and in an passive cochlear model are explained. (2) The basilar membrane motion curves and the neur'at tuning curves which are in accordance with physiological measurements ave obtained. (3) It is proved that the active mechanism makes cochlear highly frequency sensitive.
저비용항공사 객실승무원의 조직문화가 직무만족과 고객지향성에 미치는 영향: 진에어를 대상으로
최두리,양은영,권미현 한국호텔관광학회 2020 호텔관광연구 Vol.22 No.3
The purpose of this study is to broaden the main scope of airline organizational culture research from full service carriers to low cost carriers. To this end, it was first verified whether the organizational culture of low cost carrier significantly affects the job satisfaction of cabin crew. After verifying the effects of job satisfaction on customer orientation, this study finally verified whether the organizational culture directly affects the customer orientation of cabin crew. Through this analysis of the effects, the present study wanted to derive implications for organizational culture which can enhance the quality of service through customer orientation while improving job satisfaction of cabin crew working for low cost carrier. The sample data for analysis were collected through a survey of cabin crew working at Jin air, one of low cost carriers, and a total of 284 copies of the survey were used for the analysis. The collected data were analyzed by frequency analysis, confirmatory factor analysis, and structural equation modeling analysis. The results from the analysis are as follows. First, group culture and rational culture among the detailed factors of organizational culture are found to have a positive influences on job satisfaction of cabin crew. Second, job satisfaction of cabin crew in Jin air has a positive influences on customer orientation. Third, hierarchical culture is only confirmed to have a positive influences on customer orientation. These findings provide various implications for ways to strengthen the competitiveness of low cost carriers.