An M/G/1 clearing queueing system with setup time and multiple vacations for an unreliable server

This paper studies an M/G/1 clearing queueing system with setup time and multiple vacations, in which all present customers in the system are served simultaneously and breakdowns may occur in busy or setup period. We investigate the stationary distribution of system size and the Laplace–Stieltjes transform of sojourn time. In addition, various performance measures are discussed, such as the mean system size at arbitrary time and the mean length of a vacation circle. Moreover, a cost analysis is carried out for this queueing system. Numerical results are presented to study the sensitivity of the system parameters on the expected cost function and system performances.     

Lesbians and Gay Men’s Vacation Motivations,Perceptions, and Constraints: A Study of Cruise Vacation Choice

ABSTRACT

This study explores the push-pull vacation motivations of gay male and lesbian consumers and examines how these underpin their perceptions and purchase constraints of a mainstream and LGBT¹ cruise. Findings highlight a complex vacation market. Although lesbians and gay men share many of the same travel motivations as their heterosexual counterparts, the study reveals sexuality is a significant variable in their perception of cruise vacations, which further influences purchase constraints and destination choice. Gay men have more favorable perceptions than lesbians of both mainstream and LGBT cruises. The article recommends further inquiry into the multifaceted nature of motivations, perception, and constraints within the LGBT market in relation to cruise vacations.     

A multiple warm standby δ-shock system with a repairman having multiple vacations

In this article, a warm standby n-unit system is studied. The system is operational as long as there is one unit normal. The unit online, which has a lifetime distribution governed by a phase-type distribution, is also attacked by a shock from some external causes. Assume that shocks arrive according to a Poisson process. Whenever an interarrival time of shock is less than a threshold, the unit online fails. The lifetimes of the units in warm standby is exponentially distributed. A repairman who can take multiple vacations repairs the failed units based on the “first-in-first-out” rule. The repair times and the vacation times of repairman are governed by different phase-type distributions. For this system, the Markov process governing the system is constructed. The system is studied in a transient and stationary regime; the availability, the reliability, the rates of occurrence of the different types of failures, and the working probability of the repairman are calculated. A numerical application is performed to illustrate the calculations.     

具单一休假的M/M/1排队模型的指数稳定性

研究具单一休假的M/M/1排队模型,使用泛函分析方法,特别是Banach空间上线性算子理论,证明了相应的动力算子的严格占优本征值的存在性,以及系统解的线性稳定性和指数稳定性.     

A cold standby repairable system with the repairman having multiple vacations and operational,repair, and vacation times following phase-type distributions

ABSTRACT

This paper studies a cold standby repairable system with two identical components and one repairman having multiple vacations applying matrix-analytic methods. The lifetime of the component follows a phase-type distribution. The repair times and the vacation times of the repairman are governed by different phase-type distributions, respectively. For this system, the Markov process governing the system is constructed. The system is studied in a transient and stationary regime, the availability, the reliability, the rates of occurrence of the different types of failures, and the working probability of the repairman are calculated, respectively. A numerical application is performed to illustrate the calculations.     

具单一休假的M/M/1排队模型的指数稳定性(英文)

研究具单一休假的M/M/1排队模型,使用泛函分析方法,特别是Banach空间上线性算子理论,证明了相应的动力算子的严格占优本征值的存在性,以及系统解的线性稳定性和指数稳定性.     

Analysis of a batch arrival queue with vacation policy and exceptional service

ABSTRACT

We consider the distributions of operating characteristics of an M^[x]/G/1 queue under vacation policies, where the first customer of each busy period receives an exceptional service. When all the customers are served in the system exhaustively, the server deactivates and operates one of two vacation policies: (1) multiple vacation policy and (2) single vacation policy. We develop the performance measures for both systems. Finally, some numerical illustrations are also given. These two vacation models have potential applications in day-to-day life, such as post offices, banks, hospitals, etc.     

试论旅游产品的休闲化、娱乐化设计

从国民休闲发展与旅游创新角度,提出旅游产品休闲化、娱乐化设计的基本要求.在现代旅游发展进程中,需要进一步丰富国民旅游休闲的内涵,重视旅游产品休闲化、娱乐化设计,是旅游产品转型升级为休闲产品、娱乐产品的主要方向.侧重从观光旅游、会展旅游、度假旅游三大主导产品提出旅游产品休闲化、娱乐化设计的主要思路.研究结果表明:强化旅游产品的休闲和娱乐功能,可以大大提高旅游的体验性、参与性、感悟性     

河北省大学生假期打工调查分析

通过问卷、与个别打工者交谈、亲自实践等形式,对河北省各高校在校大学生假期打工情况进行系统的调查,深入了解河北省大学生假期打工现状,分析其特点,发现其中存在的问题,并结合实际情况提出相关建议和对策,从而帮助河北省大学生提高假期打工水平,加强自我保护和维权意识,为其就业奠定良好基础。