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| 1 | The Structure of Departure Process and Optimal Control Strategy N^* for Geo/G/1 Discrete-Time Queue with Multiple Server Vacations and Min(N, V)-Policy显示文摘This paper considers the departure process and the optimal control strategy for a discretetime Geo/G/1 queueing model in which the system operates under the control of multiple server vacations and Min(N, V)-policy. Using the law of total probability decomposition, the renewal theory and the probability generating function technique, the transient and the steady-state probabilities that the server is busy at any epoch n^+ are derived. The authors also obtain the explicit expression of the probability generating function for the expected number of departures occurring in the time interval (0^+, n^+] from any initial state. Meanwhile, the relationship among departure process, server's state process and service renewal process in server busy period is found, which shows the special structure of departure process. Especially, some corresponding results of departure process for special discrete-time queues are directly gained by our results. Furthermore, the approximate expansion for calculating the expected number of departures is presented. In addition, some other important performance measures,including the expected length of server busy period, server's actual vacation period and busy cycle period etc., are analyzed. Finally, some numerical results are provided to determine the optimum value N*for minimizing the system cost under a given cost structure. | LAN Shaojun TANG Yinghui | 2017 | Journal of Systems Science & Complexity2017，30，6： | 6 |
| 2 | Performance Analysis of a Discrete-Time Queue with Working Breakdowns and Searching for the Optimum Service Rate in Working Breakdown Period显示文摘This paper deals with a discrete-time Geo/Geo/1 queueing system with working breakdowns in which customers arrive at the system in variable input rates according to the states of the server. The server may be subject to breakdowns at random when it is in operation. As soon as the server fails, a repair process immediately begins. During the repair period, the defective server still provides service for the waiting customers at a lower service rate rather than completely stopping service.We analyze the stability condition for the considered system. Using the probability generating function technique, we obtain the probability generating function of the steady-state queue size distribution.Also, various important performance measures are derived explicitly. Furthermore, some numerical results are provided to carry out the sensitivity analysis so as to illustrate the effect of different parameters on the system performance measures. Finally, an operating cost function is formulated to model a computer system and the parabolic method is employed to numerically find the optimum service rate in working breakdown period. | Shaojun LAN Yinghui TANG | 2017 | Journal of Systems Science and Information2017，8，2： | 1 |
| 3 | Peak Power Minimizing Algorithm by Voltage Scheduling显示文摘 | SU Yajuan WEI Shaojun YE Tianchun CHEN Lan LUO Jiajun | 2008 | Chinese Journal of Electronics2008，17，1： | 0 |
| 4 | CDM Project Activities in China's Iron and Steel Industry:Current Status,Barriers and Development Strategies显示文摘China is now facing huge pressure from both the domestic concern of energy security and the global community's call for emission reduction commitment.As one of the major energy consumers and greenhouse gas emitters,China's iron and steel industry has a huge clean development mechanism(CDM) potential.This article both quantitatively and qualitatively analyzes the current status of CDM project activities in the iron and steel industry in China,including characteristics of approved project types,applicable methodologies,and potential technology fields.From the perspective of project implementation,the article summarizes development barriers such as high investment risk,difficulty in project identification,strict requirements on PPDs,long registration waiting time,and etc.Policy suggestions are also put forwarded to help better promote the development of CDM projects in the iron and steel industry. | Rong Fang Zeng Shaojun Yu Huijin Lan Yuxin | 2010 | Chinese Journal of Population,Resources and Environment2010，8，1： | 0 |
| 5 | An ultra low-input method for global RNA structure probing uncovers Regnase-1-mediated regulation in macrophages显示文摘To enable diverse functions and precise regulation,an RNA sequence often folds into complex yet distinct structures in different cellular states.Probing RNA in its native environment is essential to uncovering RNA structures of biological contexts.However,current methods generally require large amounts of input RNA and are challenging for physiologically relevant use.Here,we report smartSHAPE,a new RNA structure probing method that requires very low amounts of RNA input due to the largely reduced artefact of probing signals and increased efficiency of library construction.Using smartSHAPE,we showcased the profiling of the RNA structure landscape of mouse intestinal macrophages upon inflammation,and provided evidence that RNA conformational changes regulate immune responses.These results demonstrate that smartSHAPE can greatly expand the scope of RNA structure-based investigations in practical biological systems,and also provide a research paradigm for the study of post-transcriptional regulation. | Meiling Piao Pan Li Xiaomin Zeng Xi-Wen Wang Lan Kang Jinsong Zhang Yifan Wei Shaojun Zhangas Lei Tang Jianghui Zhu Chun Kit Kwok Xiaoyu Hu Qiangfeng Cliff Zhang | 2022 | Fundamental Research2022，2，1： | 0 |
| 6 | The Analysis of NGOs' Organizational Ecosystem in Participating in Climate Change Issues in the United States显示文摘How many NGOs were there in the climate change field in the United States? Who were they? And what was the relationship between them? In the United States,climate change was only a branch of environmental issues at the beginning; therefore there were no specific quantitative statistics and network analysis of NGOs in climate change. Diversity was an important feature of NGOs in American climate change fields,and it showed a complex organizational ecology through varieties of networks and interaction among organizations. In order to make a difference in climate field,Chinese NGOs firstly needed to improve and enhance their own abilities. | Yang Li Lan Yuxin Zeng Shaojun Yu Huijin | 2014 | Meteorological and Environmental Research2014，5，9： | 0 |
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