过程评估系统在口腔医学实验教学及考核中的应用与探讨

目的探讨实践操作过程评估系统在口腔医学实验教学及考核中的应用与发展。方法考察实践操作过程评估系统在口腔医学实验教学及考核中的应用,并通过调查问卷了解师生使用系统后的心得和感想,以探讨其对教学质量的影响。结果实践操作过程评估系统可以真实模拟临床操作,即时指导操作过程,客观评价操作结果,提高学生临床前期的实践操作技能,并可用于实验考核中,客观考核学生实践能力,达到良好教学效果。结论实践操作过程评估系统能够提高口腔医学实验教学质量,值得在口腔医学教学中推广应用。

基于校园网的教学过程评估系统的设计与实现

本文系统地分析了国内教学评估系统现状,结合西北工业大学数字化教学环境建设,把嵌入式监控技术与传统的动态网页技术和文本数据采集技术结合,构建了基于校园网的教学过程评估系统。通过对教学过程信息实时采集模块、设备控制模块、数据库服务器模块和评估客户端模块的设计,解决了监控系统嵌入的关键技术,实现了评估工作的实时在线管理,提高了教学和管理的信息化水平。

信息系统规划过程的动态评估

信息系统规划评估是检验系统规划过程和结果的有效性和可实施性,是信息系统实施的前提条件.通过分析国内外对信息系统规划评估的研究,提出了信息系统规划过程评估,并根据由于环境和需求的变化评价与控制是动态的过程.结合各种评价方法和指标,提出了检验信息系统规划过程有效性的动态评估体系和框架.

基于改进收敛交叉映射的厂级振荡源诊断

由于噪声、周期性、非线性和非平稳性的干扰,现有的大多数因果分析方法在工业过程控制系统的应用中往往是不可靠和不准确的。为提高厂级振荡源定位的性能,提出了一种基于改进收敛交叉映射的因果关系检测方法。首先,指出噪声和周期性对因果关系检测的不利影响。其次,将经验模态分解和去趋势波动分析相结合,实现了振荡信号去噪。然后,通过奇异谱分析有效地去除信号的周期性。利用收敛交叉映射可以对去噪去周期后的信号进行分析,进而准确地定位厂级振荡的源头。仿真结果表明,所提方法能提高过程控制系统中厂级振荡源定位的准确性。

Risk Assessment Based on Fault Tree Analysis for Damaged Pipe Repair During Operation in Petrochemical Plant

In petrochemical plant, the in-operation repairing is usually a repairing strategy with pressured inoperation repairing for avoiding huge economic losses caused by unplanned shutdown when some slight local leakage happens in pipes. This paper studies the effects of repairing strategies on the failure probability of the pipe systems in process industries based on the time-average fault tree approach, especially the in-operation repairing strategies including pressured in-operation repairing activities. The fault tree model can predict the effect of different repairing plans on the pipe failure probability, which is significant to the optimization of the repairing plans. At first pipes are distinguished into four states in this model, i.e., successive state, flaw state, leakage state and failure state. Then the fault tree approach, which is usually applied in the studies of dynamic equipment, is adopted to model the pipe failure. Moreover, the effect of pressured in-operation repairing is also considered in the model. In addition, this paper proposes a series of time-average parameters of the fault tree model, all of which are used to calculate node parameters of the fault tree model. At last, a practical case is calculated based on the fault tree model in a repairing activity of pipe thinning.

Effects of Permafrost Degradation on Soil Hydrological Processes in Alpine Steppe on the Qinghai-Tibet Plateau

Permafrost degradation is prevalent on the Qinghai-Tibet Plateau.This may lead to changes in water and heat transition in soils and thus affect the structure and function of ecosystems.In this paper,using the measured data of alpine steppe in Wudaoliang assessed the model performance in simulating soil freezing and thawing processes.Comparison of the simulated results by simultaneous heat and water(SHAW) model to the measured data showed that SHAW model performed satisfactorily.Based on analyzing the simulated and predicted results,two points were obtained:(1) freezing and thawing of the active layer proceeded both from the soil surface downward.Compared with the freezing process,the thawing process was slower.The freezing period persisted in the surface layer(4 cm depth) for about 5 months;(2) in the next 50 years,frozen period would be shorten about 20 days in the top 100 cm depth while the thawing would start earlier 40 days than present.Soil water storage in the 0-60 cm would decrease by 22% averagely,especially from June to August when the vegetation is at the dominating water consumed stage.Therefore,this kind of permafrost degradation as active layer freezing and thawing processes changes will reduce soil water content and thus influence those ecosystems above it.

Advantages and Disadvantages of Quantitative and Qualitative Information Risk Approaches

Due to rapidly development of information systems, risk and security issues have increased and became a phenomenon that concerns every organization, without considering the size of it. To achieve desired results, managers have to implement methods of evaluating and mitigating risk as part of a process well elaborated. Security risk management helps managers to better control the business practices and improve the business process. An effective risk management process is based on a successful IT security program. This doesn＇t mean that the main goal of an organization＇s risk management process is to protect its IT assets, but to protect the organization and its ability to perform their missions. During this process, managers have to take into consideration risks that can affect the organization and apply the most suitable measures to minimize their impact. The most important task is choosing the best suited method for analyzing the existing risk properly. Several methods have been developed, being classified in quantitative and qualitative approaches of evaluating risk. The purpose of this paper is to present the advantages and disadvantages of each approach taking current needs and opportunities into consideration.

Research and Design of the Adaptive Evaluation System Based on the IRT Theory

This paper, on the basis of the author realizing the skill evaluation system based on real environment, discusses several commonly used parameter estimation methods based on item response theory （ IRT ） and analyzes the advantages and disadvantages of each estimation method and their respective application fields. Also, it expounds the research theory and design process of skill adaptive evaluation system based on real environment and the innovation of the system.

Expert System Land Evaluation for Oil Palm Cultivation （ESLEOP）

Land evaluation assesses the suitability of land for specified land uses. The FAO Framework for Land Evaluation provides guidance for land suitability assessment. An Expert System Land Evaluation for Oil Palm Cultivation （ESLEOP） software was developed using climate, land qualities and land characteristics as diagnostic criteria in order to speed up the process of land assessment for oil palm cultivation in tropical regions. The results showed that ESLEOP evaluated land suitability for oil palm cultivation faster than the conventional method.

Evaluation of Signaling Loads in NO Stack 5G Mobile Network

Present mobile communication system suffers from the exponentially increased mobile traffic and research on the fifth generation(5G) mobile network architectures is ongoing to solve this problem. We investigate the feasibility of the proposals used for the network architecture evolution from 4G to 5G and first propose a compatible network architecture, which decouples the management plane, the control plane and the user plane based on NO Stack framework proposed in our previous study. We mainly design detail procedures including UE attachment, service request and dedicated bearer activation/deactivation for our proposal network architecture. Finally, we establish a clear analytical mode of the application and system states to evaluate the signaling loads of new architecture. Simulation results show that our proposal network architecture with elaborated signaling procedures has much impact on the total signaling loads of system and could obviously decrease the signaling overhead compared with LTE.