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Search Results: 1 - 10 of 21895 matches for " zhi "
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Coping style and mental health on high school students  [PDF]
Zhi Wang
Health (Health) , 2013, DOI: 10.4236/health.2013.52023

Objective: To explore the coping style of high school students and its relationship to mental health. Methods: Make a survey upon 320 students through coping style questionnaire and MSMH. Results: High school students often resort to problem solving and appeal to coping factors. No distinct gender difference is found in coping style. There are different degrees of correlation between coping style and mental health. Remarkable grade difference is shown in the factor of appealing in coping style and the three factors of compulsion, anxiety and mental imbalance in mental health. Conclusion: Relatively mature coping style has come into existence among high school students, but more guidance and assistance are in need in cultivating the coping style and improving the mental health.

Realization of Rough Set Approximation Toplogical Operations Based on Formal Concept Analysis  [PDF]
Huilai Zhi
International Journal of Intelligence Science (IJIS) , 2014, DOI: 10.4236/ijis.2014.43008

There is an intimate correlation between rough set theory and formal concept analysis theory, so rough set approximations can be realized by means of formal concept analysis. For any given multiple valued information system, the realization of rough set approximation operation has two major steps, firstly convert the information system from multiple valued one to single valued formal context, secondly realize rough set approximation operations aided by concept lattice, which is equivalent to a query operation under some necessary conditions.

An Exploration on the Relationship between Self-Concept and Parenting Style on Teenager  [PDF]
Zhi Wang
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.64048
Abstract: To explore the relationship between self-concept and parenting style, and to provide bases for improving self-concept on teenager, a total of 1000 teenager were tested with self-concept scale and parenting style scale. Total self-concept, self-concept of social orientation and self-concept of personal orientation were associated with factors of parenting style, which could predict total self-concept, self-concept of social orientation and self-concept of personal orientation. Factors of parenting style had the effects on the extents of total self-concept, self-concept of social orientation and self-concept of personal orientation of teenager.
An Algorithm for Traffic Equilibrium Flow with Capacity Constraints of Arcs  [PDF]
Zhi Lin
Journal of Transportation Technologies (JTTs) , 2015, DOI: 10.4236/jtts.2015.54022
Abstract: In the traffic equilibrium problem, we introduce capacity constraints of arcs, extend Beckmann’s formula to include these constraints, and give an algorithm for traffic equilibrium flows with capacity constraints on arcs. Using an example, we illustrate the application of the algorithm and show that Beckmann’s formula is a sufficient condition only, not a necessary condition, for traffic equilibrium with capacity constraints of arcs.
Empirical Research on Repo Rates Based on Exponenti- al Smooth Transition Autoregressive Model  [PDF]
Qi-zhi He
Journal of Service Science and Management (JSSM) , 2008, DOI: 10.4236/jssm.2008.11007
Abstract: In the process of China's marketization of interest rates, researching the characteristics of interest rates has very important theoretical and practical significance. Based on Chinese interbank repo interest rates, the characteristics of daily interest rates and monthly interest rates and their spreads have been researched, and unit root tests are paid to the level, the first difference and the spread of daily interest rates and monthly interest rates based on the traditional method and the exponential smooth transition autoregressive method (ESTAR) respectively. The results show: Firstly, as for different term of repo interest rates, the characteristics are different. Secondly, both lists of daily rates and monthly rates are integrated of order 1. Thirdly, the spread of daily interest rates and monthly interest rates is not stationary by use of ADF, but stationary by use of ESTAR. Finally, the long-run equilibrium relationship between daily repo interest rates and monthly repo interest rates is stable with nonlinear adjustment.
An Optimal Algorithm for Over-the-Air Reprogramming Protocol in WSNs  [PDF]
Ting WEN, Zhi LI
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.12017
Abstract: The over-the-air reprogramming has played an important role in Wireless Sensor Networks (WSNs), and has been widely researched. But the problems of low efficiency and high energy consumption have brought new challenges to the research. This paper presents an optimal algorithm, it is targeted to address the problem of relatively low efficiency and high energy consumption in over-the-air reprogramming in WSNs. Simulation results demonstrate that the optimal algorithm can improve the efficiency of over-the-air reprogramming in WSNs, and make the energy consumption in network not only lower but more balanced.
An Energy-Efficient Access Control Algorithm with Cross-Layer Optimization in Wireless Sensor Networks  [PDF]
Zhi Chen, Shaoqian Li
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.22022
Abstract: This paper presents a wireless sensor network (WSN) access control algorithm designed to minimize WSN node energy consumption. Based on slotted ALOHA protocol, this algorithm incorporates the power control of physical layer, the transmitting probability of medium access control (MAC) layer, and the automatic repeat request (ARQ) of link layer. In this algorithm, a cross-layer optimization is preformed to minimizing the energy consuming per bit. Through theory deducing, the transmitting probability and transmitting power level is determined, and the relationship between energy consuming per bit and throughput per node is provided. Analytical results show that the cross-layer algorithm results in a significant energy savings relative to layered design subject to the same throughput per node, and the energy saving is extraordinary in the low throughput region.
Emergency Tasks Planning Based on Formal Modeling of Emergency Plan and HTN Planning System SHOP2  [PDF]
Jun Tian, Zhi Li
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.46040
Abstract: A theoretical approach of ordered emergency tasks generation is proposed for dealing with a specific emergency event rapidly, exactly and effectively. According to the general principles of an emergency plan developed to response to an emergency management, a workflow model is employed to complete the formal modeling of concrete emergency plan firstly. Then the HTN planning system SHOP2 is introduced, the transformation method of domain knowledge from emergency domain to SHOP2 domain is studied. At last, the general procedure to solve the emergency decision prob-lems and to generate executive emergency tasks is set up drawing support from SHOP2 planning system, which will combine the principles (or knowledge) of emergency plan and the real emergency situations.
3D DSMC Simulation of Rarefied Gas Flows around a Space Crew Capsule Using OpenFOAM  [PDF]
Zhi Shang, Shuo Chen
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31005

An open source Direct Simulation Monte Carlo (DSMC) code, called as dsmcFoam in OpenFOAM, is used to study a blunt body with the shape of a space crew capsule return vehicle. The rarefied gas has the Knudsen number with 0.03. The flow with a Mach number 4.35 over the capsule was simulated by DSMC. The distributions of velocity field and temperature around the capsule were calculated. This study may provide some useful information for the reentry of the return vehicle.

Towards Quantitative Characterisation of the Small Force Transducer Used in Nanoindentation Instruments  [PDF]
Zhi Li, Uwe Brand
Modern Instrumentation (MI) , 2013, DOI: 10.4236/mi.2013.24009

Quantitative characterization of the mechanical properties of materials in micro-/nano-scale using depth-sensing indentation technique demands high performance of nanoindentation instruments in use. In this paper, the efforts to calibrate the capacitive force transducer of a commercial nanoindentation instrument are presented, where the quasi-static characteristic of the force transducer has been calibrated by a precise compensation balance with a resolution of ~1 nN. To investigate the dynamic response of the transducer, an electrostatic MEMS (Micro-Electro-Mechanical System) based on nano-force transfer standard with nano-Newton (10-9 Newton) resolution and a bandwidth up to 6 kHz have been employed. Preliminary experimental results indicate that 1) the force transducer under calibration has a probing force uncertainty less than 300 nN (1σ) in the calibration range of 1 mN; 2) the transient duration at contact points amounts to 10 seconds; 3) the overshoot of engagement is pre-load dependent.

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