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A Comparison of University Career Services in China and the United States
Chao Wei,Patrick Akos,Xia Jiang,Sue Harbour 한국상담학회 2016 Journal of Asia Pacific counseling Vol.6 No.1
University career services play an important role in helping students recognize their own characteristics and reach employment goals. The United States, and more recently China, have invested in career services to enable graduates to contribute and thrive. This paper utilizes the University of North Carolina at Chapel Hill and the Wuhan University of Technology as a case comparison sample to compare career services. This paper demonstrates substantial differences between the SCC and UCS, in terms of student enrollment, annual financing, staff number, annual number of career counseling sessions conducted in the career center, and area of dedicated space. Data suggested that similar career theories were utilized to guide career counseling; however, significant differences were observed in the resources and modalities employed. We speculate that these differences are primarily based on the history and culture of the two countries and we offer some implications for the future of university career services.
An Energy Harvesting Aware Routing Algorithm for Hierarchical Clustering Wireless Sensor Networks
( Chaowei Tang ),( Qian Tan ),( Yanni Han ),( Wei An ),( Haibo Li ),( Hui Tang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.2
Recently, energy harvesting technology has been integrated into wireless sensor networks to ameliorate the nodes` energy limitation problem. In theory, the wireless sensor node equipped with an energy harvesting module can work permanently until hardware failures happen. However, due to the change of power supply, the traditional hierarchical network routing protocol can not be effectively adopted in energy harvesting wireless sensor networks. In this paper, we improve the Low-Energy Adaptive Clustering Hierarchy (LEACH) protocol to make it suitable for the energy harvesting wireless sensor networks. Specifically, the cluster heads are selected according to the estimation of nodes` harvested energy and consumed energy. Preference is given to the nodes with high harvested energy while taking the energy consumption rate into account. The utilization of harvested energy is mathematically formulated as a max-min optimization problem which maximizes the minimum energy conservation of each node. We have proved that maximizing the minimum energy conservation is an NP-hard problem theoretically. Thus, a polynomial time algorithm has been proposed to derive the near-optimal performance. Extensive simulation results show that our proposed routing scheme outperforms previous works in terms of energy conservation and balanced distribution.
HOW DID A MAJOR CONFINED FLARE OCCUR IN SUPER SOLAR ACTIVE REGION 12192?
Jiang, Chaowei,Wu, S. T.,Yurchyshyn, Vasyl,Wang, Haiming,Feng, Xueshang,Hu, Qiang American Astronomical Society 2016 The Astrophysical journal Vol.828 No.1
<P>We study the physical mechanism of a major X-class solar flare that occurred in the super NOAA active region (AR) 12192 using data-driven numerical magnetohydrodynamic (MHD) modeling complemented with observations. With the evolving magnetic fields observed at the solar surface as bottom boundary input, we drive an MHD system to evolve self-consistently in correspondence with the realistic coronal evolution. During a two-day time interval, the modeled coronal field has been slowly stressed by the photospheric field evolution, which gradually created a large-scale coronal current sheet, i.e., a narrow layer with intense current, in the core of the AR. The current layer was successively enhanced until it became so thin that a tether-cutting reconnection between the sheared magnetic arcades was set in, which led to a flare. The modeled reconnecting field lines and their footpoints match well the observed hot flaring loops and the flare ribbons, respectively, suggesting that the model has successfully 'reproduced' the macroscopic magnetic process of the flare. In particular, with simulation, we explained why this event is a confined eruption-the consequence of the reconnection is a shared arcade instead of a newly formed flux rope. We also found a much weaker magnetic implosion effect compared to many other X-class flares.</P>
Outage Performance for DF Two-Way Relaying with Co-Channel Interference over Nakagami-m Fading
( Jinhong Fan ),( Chaowei Yuan ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.11
In this paper, we investigate the outage performance of a two-way decode-and-forward relaying network in an interference-limited Nakagami-m fading environment. More specifically, assuming the presence of Nakagami-m faded multiple co-channel interferers at the source/destination terminals, the closed-form approximate expression for the outage probability is derived by using moment-based estimators attaining the appropriate Nakagami-m fading parameter. Simulation results demonstrate that our analytical result is in excellent agreement with the Monte Carlo simulation.
Combined Service Subscription and Delivery Energy-Efficient Scheduling in Mobile Cloud Computing
( Xing Liu ),( Chaowei Yuan ),( Enda Peng ),( Zhen Yang ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.5
Mobile cloud computing (MCC) combines mobile Internet and cloud computing to improve the performance of applications. In MCC, the data processing and storage for mobile devices (MDs) is provided on the remote cloud. However, MCC faces the problem of energy efficiency caused by randomly varying channels. In this paper, by introducing the Lyapunov optimization method, we propose a combined service subscription and delivery (CSSD) algorithm that can guide the users to subscribe to services reasonably. This algorithm can also determine whether to deliver the data and to whom data is sent in the current time unit based on the queue backlog and the channel state. Numerical results validate the correctness and effectiveness of our proposed CSSD algorithm.
Transmission Scheme for Asymmetric MIMO Two-way Relay with Channel Estimation Error
Jinhong Fan,Chaowei Yuan,Ke Xiao 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7
In this paper, we consider the transmission scheme for asymmetric decode-and-forward (DF) multi-input multi-output (MIMO) two-way relay system with channel estimation error. In order to transmit with asymmetric data rates from the relay to the receivers according to their individual link qualities, we propose a novel transmission scheme for the broadcast phase by employing a priori bit information. The proposed scheme employs multi-antenna and network coding at the relay. The idea is the weaker link receiver exploits a priori bit information in each transmit symbol, so that it only needs to decode on a subset of the transmit symbol constellation. Subject to the same bit error rate constraint, the weaker link receiver can decode at lower signal-to-noise ratio compared to the stronger link. The different signal labeling used for mapping bits to symbols at the relay cause different minimum Euclidean distance, so it is shown to be crucial for the performance at the receivers. Subsequently, we investigate the effect of the channel estimation error on the system performance. Simulations show that the proposed transmission scheme can be applied to practical scenarios with asymmetric channel qualities.
Multi-path Routing Policy for Content Distribution in Content Network
( Lei Yang ),( Chaowei Tang ),( Heng Wang ),( Hui Tang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.5
Content distribution technology, which routes content to the cache servers, is considered as an effective method to reduce the response time of the user requests. However, due to the exponential increases of content traffic, traditional content routing methods suffer from high delay and consequent inefficient delivery. In this paper, a content selection policy is proposed, which combines the histories of cache hit and cache hit rate to collaboratively determine the content popularity. Specifically, the CGM policy promotes the probability of possible superior paths considering the storage cost and transmission cost of content network. Then, the content routing table is updated with the proportion of the distribution on the paths. Extensive simulation results show that our proposed scheme improves the content routing and outperforms existing routing schemes in terms of Internet traffic and access latency.
( Heng Wang ),( Chaowei Tang ),( Zhenzhen Zhao ),( Hui Tang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10
To efficiently reduce on-grid energy consumption, the admission control algorithm in the hybrid energy powered cellular network (HybE-Net) with base stations (BSs) powered by on-grid energy and solar energy is studied. In HybE-Net, the fluctuation of solar energy harvesting and energy consumption may result in the imbalance of solar energy utilization among BSs, i.e., some BSs may be surplus in solar energy, while others may maintain operation with on-grid energy supply. Obviously, it makes solar energy not completely useable, and on-grid energy cannot be reduced at capacity. Thus, how to control user admission to improve solar energy utilization and to reduce on-grid energy consumption is a great challenge. Motivated by this, we first model the energy flow behavior by using stochastic queue model, and dynamic energy characteristics are analyzed mathematically. Then, fuzzy logic based admission control algorithm is proposed, which comprehensively considers admission judgment parameters, e.g., transmission rate, bandwidth, energy state of BSs. Moreover, the index of solar energy utilization balancing is proposed to improve the balance of energy utilization among different BSs in the proposed algorithm. Finally, simulation results demonstrate that the proposed algorithm performs excellently in improving solar energy utilization and reducing on-grid energy consumption of the HybE-Net.
China's New Role in the Region of the Middle East: A Policy Debate
Chuchu Zhang,Chaowei Xiao 인하대학교 국제관계연구소 2019 Pacific Focus Vol.34 No.2
Along with China’s growing presence and interests in the Middle East, Bei-jingfinds it increasingly challenging to sit on the sidelines of regional con-flicts and tensions and has called for establishing China’s new role in theregion. By adopting content analysis to examine 53 articles written by Chi-nese elites, this study analyzes how the concept of China’s new role in theMiddle East is understood by this group. In particular, it addresses the fol-lowing questions: What is new about China’s new role? What are the pol-icy debates of Chinese elites? And, has China’s policy fundamentallychanged or not? This studyfinds that the concept of“China’s new role inthe Middle East”is still under heated debate. This concerns what extent,and in which aspects, China should abandon the non-interference and non-involvement policy in the Middle East; whether China should identify itselfas an order participant or order shaper; and which countries China shouldattach most importance to when conducting role adjustment in the region.The article alsofinds that China’s elites and decision makers oscillatebetween prioritizing China’s economic interests and geopolitical concernswith respect to this issue. This argument is tested by using the ordinaryleast squares model. The article concludes that the new role is too vagueto be institutionalized at this stage, which reflects China’s dilemmabetween expanding its influence and discursive power in the Middle East’srule-setting, and trying to maintain its current risk-aversion policy by notturning any Middle Eastern country or major international player in theregion, such as the United States, into a hostile force.
Lim, Eun-Kyung,Yurchyshyn, Vasyl,Kumar, Pankaj,Cho, Kyuhyoun,Jiang, Chaowei,Kim, Sujin,Yang, Heesu,Chae, Jongchul,Cho, Kyung-Suk,Lee, Jeongwoo American Astronomical Society 2017 The Astrophysical journal Vol.850 No.2
<P>Solar flare ribbons provide an important clue to the magnetic reconnection process and associated magnetic field topology in the solar corona. We detected a large-scale secondary flare ribbon of a circular shape that developed in association with two successive M-class flares and one coronal mass ejection. The ribbon revealed interesting properties such as (1) a quasi-circular shape and enclosing the central active region (AR); (2) the size as large as 500 '' by 650 ''; (3) successive brightenings in the clockwise direction at a speed of 160 km s(-1) starting from the nearest position to the flaring sunspots; (4) radial contraction and expansion in the northern and the southern part, respectively, at speeds of <= 10 km s(-1). Using multi-wavelength data from Solar Dynamics Observatory, RHESSI, XRT, and Nobeyama, along with magnetic field extrapolations, we found that: (1) the secondary ribbon location is consistent with those of the field line footpoints of a fan-shaped magnetic structure that connects the flaring region and the ambient decaying field; (2) the second M2.6 flare occurred when the expanding coronal loops driven by the first M2.0 flare encountered the background decayed field; (3) immediately after the second flare, the secondary ribbon developed along with dimming regions. Based on our findings, we suggest that interaction between the expanding sigmoid field and the overlying fan-shaped field triggered the secondary reconnection that resulted in the field opening and formation of the quasi-circular secondary ribbon. We thus conclude that interaction between the AR and the ambient large-scale fields should be taken into account to fully understand the entire eruption process.</P>