Modified 802.11-Based Opportunistic Spectrum Access in Cognitive Radio Networks

Linbo Zhai,Xiaomin Zhang 한국전자통신연구원 2012 ETRI Journal Vol.34 No.2

In this letter, a modified 802.11-based opportunistic spectrum access is proposed for single-channel cognitive radio networks where primary users operate on a slot-by-slot basis. In our opportunistic spectrum access, control frames are used to reduce the slot-boundary impact and achieve channel reservation to improve throughput of secondary users. An absorbing Markov chain model is used to analyze the throughput of secondary users. Simulation results show that the analysis accurately predicts the saturation throughput.

Global Warming and Policy Suggestions to "Energy Saving and Emission Reduction" in Logistics Industry

Linbo Jing,Xuefeng Wang 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.9

This paper summarizes the severity of global warming, the collaboration and endeavor of governments in coping with this problem and the trend of international development for "energy-saving and emission reduction". Then it discusses the high pressure Chinese government endured under the circumstance of "global warming" and "energy-saving and emission reduction", as well as policies and targets made by Chinese government towards these. Based on this, we analyzed the possibility and feasibility of "energy-saving and emission reduction" in logistics industry, and proposed some corresponding advises.

Global warming, policy suggestion to logistics industry about 'Energy saving and emission reduction'

Linbo Jing,Xuefeng Wang 인하대학교 정석물류통상연구원 2009 JOURNAL OF INTERNATIONAL LOGISTICS AND TRADE Vol.7 No.2

This paper summarizes the severity of global warming, collaboration and endeavor within international government andthetrend of international developmentfor "energy-saving andemission reduction." The Chinese government is enduring high pressure under the environment of "global warming" and "energy-saving andemission reduction" and it hasmade a policy for "energy-saving andemission reduction. "Based onthis, weanalyzed thepossibility andfeasibility for ourlogistics to "energy-saving and emission reduction,"then propose some solutions for our logistics industry to development and"energy-saving andemission reduction."

Resilient Tracking Control for Unmanned Helicopter Under Variable Disturbance and Input Perturbation

Linbo Chen,Tao Li,Zehui Mao,Shumin Fei 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.1

In this work, by utilizing a disturbance observer-based control (DOBC) method, the resilient tracking control is studied for the unmanned aerial helicopter (UAH) with paramteter uncertainty, multiple disturbances, and input perturbation. Firstly, a state observer and two disturbance observers are respectively constructed to estimate the unmeasurable flapping motion states and outside disturbances, which are further utilized to design the feedforward controller. Secondly, by considering stochastic perturbation, a resilient feedback controller is proposed and an overall closed-loop error system is established. Thirdly, based on stochastic control theory and robust control method, a sufficient condition is obtained to guarantee the asymptotical stability and H∞ performance index for the closed-loop error system. Furthermore, the observer gains and controller one can be jointly checked by solving the derived linear matrix inequality (LMI). Finally, some simulations are presented to verify the effectiveness of the derived control method.

Conformity–interpersonal Value and Guanxi Building Behavior: the Mediating Role of Mental Accounting Non-fungibility Effect and the Moderating Role of Frustration

Linbo Yang 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.9

This study examined the effect of the individual conformity-interpersonal value on guanxi building behavior by focusing on the mediating role of mental accounting non-fungibility effect and the moderating role of frustration. The results of analyzing 291 cases from five provinces in the People’s Republic of China showed that conformity–interpersonal value was positively related to guanxi building behavior. In addition, non-fungibility of mental accounting mediated the main effect of conformity–interpersonal value on guanxi building behavior, while frustration moderated the negative relationship between conformity-interpersonal value and mental accounting non-fungibility effect such that the relationship was stronger among low frustration individuals than among high ones.

Observing the Characteristics of Multi-Activity Trip Chain and Its Influencing Mechanism

Linbo Li,Mengfei Cao,Jiajun Yin,Yanli Wang,Sabyasachee Mishra 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.11

Understanding mechanism of daily activity trip chain especially multi-activity trip chain is significant for travel demand management and urban redevelopment. This paper explores the multi-activity trip chain behavior from both individual attributes and spatial attributes. Multi- activity trip chain is identified from people’s full-day travel diaries, then categorized into multi-activity intermittent trip chain and continuous trip chain to distinguish the characteristics and influencing factors of different chains. Using resident travel survey data of Xiaoshan District of Hangzhou, China, multinomial logistic regression model, transition probability matrix and activity analysis methods are employed to make analyses. Findings include: 1) making multi-activity trip chain can achieve multiple purposes with less average travel time for each purpose, but public transit is less used. 2) The choices of single or multi-activity trip chain and multi-activity intermittent or continuous trip chain are mainly affected by different individual attributes such as occupation, education, household income, etc. Moreover, household registration, driver’s license, gender, and household car ownership are related to the choice of activity sequence. 3) For typical trip chain with purposes of work, shopping/dining, and home, activity sequence is also obviously influenced by spatial distance between origin and destination, especially for the chain of work-shopping/dining-home.

Global wanning, policy suggestion to logistics industry about 'Energy saving and emission reduction'

Jing, Linbo,Wang, Xuefeng Jungseok Research Institute of International Logis 2009 JOURNAL OF INTERNATIONAL LOGISTICS AND TRADE Vol.7 No.2

This paper summarizes the severity of global warming, collaboration and endeavor within international government andthetrend of international developmentfor "energy-saving andemission reduction." The Chinese government is enduring high pressure under the environment of "global warming" and "energy-saving andemission reduction" and it hasmade a policy for "energy-saving andemission reduction. "Based onthis, weanalyzed thepossibility andfeasibility for ourlogistics to "energy-saving and emission reduction,"then propose some solutions for our logistics industry to development and"energy-saving andemission reduction."

Logistics Outsourcing in China and Comparative Analysis

Jing, Linbo 인하대학교 정석물류통상연구원 2008 인하대학교 정석물류통상연구원 학술대회 Vol.2008 No.11

中国经济的新挑战: 从“六稳”到“六保”

荆林波 ( Jing Linbo ) 성균관대학교 성균중국연구소 2020 중국사회과학논총 Vol.2 No.2

中国经济告别了传统的高速增长阶段, 进入一个中高速的新常态。2019年9月, 国务院总理李克强部署精准施策加大力度做好“六稳”工作。稳就业、稳金融、稳外贸、稳外资、稳投资、稳预期, 涵盖了我国目前经济生活的主要方面。受全球疫情的冲击, 中国经济面临着新挑战, 2020年4月在疫情防控常态化前提下, 首次提出“六保”。本文紧紧围绕“六保”的内容, 进行了逐一分析。要解决好稳就业, 必须关注高校毕业生、农民工、贫困地区劳动力等重点群体。保基本民生, 要强化对城市贫困人群的基本生活保障, 扩大社会救助覆盖面并提高救助水平, 更好保障困难群体的基本生活。强化政策的落实力度, 让中小微企业真正享受到政策红利, 切实解决经营中的难题。保粮食能源安全、保产业链供应链稳定、保基层运转, 坚定实施扩大内需战略, 维护经济发展和社会稳定大局, 确保完成决战决胜脱贫攻坚目标任务, 全面建成小康社会。 China’s economy has moved away from the traditional period of high-speed growth and entered a new normal of medium and high speed. In September 2019, Premier Li Keqiang deployed precision to step up efforts to do a good job of “six stability”. Steady employment, stable finance, stable foreign trade, steady foreign investment, steady investment, stable expectations, covering the current economic life of China’s main aspects. Affected by the global epidemic, China’s economy is facing new challenges, in April 2020 under the premise of normalization of epidemic prevention and control, the first proposed “six guarantees” This article closely around the “six guarantees”, one by one analysis. In order to solve the steady employment, we must pay attention to the key groups such as college graduates, migrant workers and labor force in poor areas. To ensure basic people’s livelihood, we should strengthen the basic living security for the urban poor, expand the coverage of social assistance and improve the level of assistance, and better protect the basic livelihood of the needy groups. Strengthen the implementation of policies, so that small and medium-sized enterprises really enjoy the policy dividends, and effectively solve the difficulties in business. To ensure food and energy security, to ensure the stability of the supply chain of the industrial chain, to ensure the operation of the grass-roots level, firmly implement the strategy of expanding domestic demand, safeguard the overall situation of economic development and social stability, ensure the completion of the decisive battle to overcome poverty and achieve the goal of comprehensive construction of a well-off society.

A Fiber Spool’s Vibration Sensitivity Optimization Based on Orthogonal Experimental Design

Jing Gao,Linbo Zhang,Dongdong Jiao,Guanjun Xu,Xue Deng,Qi Zang,Honglei Yang,Ruifang Dong,Tao Liu,Shougang Zhang 한국광학회 2024 Current Optics and Photonics Vol.8 No.1

A fiber spool with ultra-low vibration sensitivity has been demonstrated for the ultra-narrowlinewidth fiber-stabilized laser by the multi-object orthogonal experimental design method, which can achieve the optimization object and analysis of influence levels without extensive computation. According to a test of 4 levels and 4 factors, an L 16 (4 4 ) orthogonal table is established to design orthogonal experiments. The vibration sensitivities along the axial and radial directions and the normalized sums of the vibration sensitivities are determined as single objects and comprehensive objects, respectively. We adopt the range analysis of object values to obtain the influence levels of the four design parameters on the single objects and the comprehensive object. The optimal parameter combinations are determined by both methods of comprehensive balance and evaluation. Based on the corresponding fractional frequency stability of ultra-narrow-linewidth fiber-stabilized lasers, we obtain the final optimal parameter combination A3B1C2D1, which can achieve the fiber spool with vibration sensitivities of 10 −12 /g magnitude. This work is the first time to use an orthogonal experimental design method to optimize the vibration sensitivities of fiber spools, providing an approach to design the fiber spool with ultra-low vibration sensitivity.