Reference For Performance Evaluation Research Articles

Teaching According to the Competency-based at Technical Pedagogical Universities

Background: Six basic characteristics of competency-based teaching are: (1) teaching is conducted based on performance and individual needs; (2) the process can provide immediate learner feedback; (3) performance competencies are determined based on work analysis; (4) the program contains measurable goals and (6) uses performance standards as a reference for performance evaluation. Objective: This study is conducted to investigate the training quality of Technical Pedagogical University according to competency-based teaching. Methods: This study uses a quantitative approach, a survey of 54 school administrators and 186 lecturers from Technical Pedagogical University and 43 school administrators from Vocational Schools in Vietnam. Results: The main findings of the current study are (i) the training quality at Technical Pedagogical University that school administrators and lecturers from Technical Pedagogical University reported was relatively high; (ii) the levels of satisfaction with task requirements at Technical Pedagogical University reported by school administrators at vocational schools were relatively high. Conclusion: Although the evaluation from school administrators and lecturers from the two institutes is quite high, educators should focus on diversified and effective methods to enhance the quality of teaching in educational settings, especially competency-based teaching in universities.

Optimization of random forest through the use of MVO, GWO and MFO in evaluating the stability of underground entry-type excavations

The stability evaluation of underground entry-type excavations is a prerequisite of the entry-type mining method, which directly affects whether workers can be provided with a safe and reliable working environment and whether subsequent mining operations can be carried out normally. The design and stability assessment of entry-type excavations in current mining engineering largely relies on an empirical design method called the critical span graph, which has been widely applied in the initial span design of various cut and fill stopes. In recent years, with the wide application of various intelligent algorithms in the field of mine engineering, models based on intelligent algorithms provide new research methods and ideas for the assessment of rock stability in entry-type excavations. This study aims to introduce several hybrid models based on the random forest (RF) algorithm into the stability evaluation work to find new data-driven methods with higher accuracy to update the critical span graph. To pursue better classification performance, this paper selects three optimization strategies, namely multi-verse optimizer (MVO), grey wolf optimizer (GWO) and moth-flame optimization (MFO) algorithm, to optimize two core parameters of RF, and establishes three corresponding hybrid models, abbreviated as MVO-RF, GWO-RF and MFO-RF, based on the database containing 399 samples from seven Canada mines. There are two input parameters in the database, i.e., opening span and rock mass condition (expressed as RMR), and the output parameter is rock mass stability, which is specifically divided into three categories: stable, potentially unstable and unstable. In addition, five commonly used measurement indexes applicable to multiclassification problems were adopted to verify the classification ability of the models, i.e., the accuracy (ACC), precision calculated using macro-average (PREM), recall calculated using macro-average (RECM), F1 score calculated using macro-average (F1M) and Kappa index (Kappa). The results indicate that the three hybrid models performed well based on the test set accounting for 25 % of the original database, in which the accuracy of the MFO-RF model was the highest: ACC = 0.9300; PREM = 0.9288; RECM = 0.8983; F1M = 0.9116; Kappa = 0.8666. To evaluate whether the three optimization strategies can effectively improve the performance of RF and judge the degree of improvement, the performance of an unoptimized RF model was discussed in this study. In addition, two support vector machine (SVM) models with different kernel functions were selected as references for performance evaluation. The results indicated that compared with the RF and two SVM models, the classification accuracy of the three hybrid models was obviously more satisfactory. The classification accuracy of the three hybrid models reached 0.91, which was sufficient to explain the excellent classification ability of these models. After tuning the RF hyperparameters of each hybrid model, the critical span graph was further updated according to the optimized classification models, which was the focus of this research. By comparing the critical span graphs obtained by the three hybrid models with the single RF model and two kinds of SVM models, it is certain that the three hybrid models proposed in this paper, MVO-RF, GWO-RF and MFO-RF, are promising in the study of evaluating the stability of entry-type excavations and may be deemed auxiliary decision tools to define the stability region of the critical span graph.

Study on ageing characteristics and evaluation methods of RTV silicone rubber in high humidity area.

Due to high humidity, the ageing of room temperature vulcanized silicone rubber (RTV) has been a serious problem in Southwestern China. In order to solve the problem of RTV life prediction, the aging classification method was established by analyzing the microtopography of RTV samples in this paper. Besides, the comprehensive analysis of RTV element content, partial element content ratio, and major chemical groups of RTV samples in each aging level were conducted. It is found that as the ageing level increases, the element contents of C, Si, O, Al change accordingly and the ratio of C:Si drops from 2.39 to 1.54, and absorption peaks of the chemical groups of Si-(CH3)2, Si-O-Si, Si-CH3 and C-H in CH3 decrease. This work can enrich the investigation of RTV, and may provide useful reference for performance evaluation and replacement of RTV in substations.

Energy Consumption Analysis for Concrete Residences—A Baseline Study in Taiwan

Estimating building energy consumption is difficult because it deals with complex interactions among uncertain weather conditions, occupant behaviors, and building characteristics. To facilitate estimation, this study employs a benchmarking methodology to obtain energy baseline for sample buildings. Utilizing a scientific simulation tool, this study attempts to develop energy consumption baselines of two typical concrete residences in Taiwan, and subsequently allows a simplified energy consumption prediction process at an early design stage of building development. Using weather data of three metropolitan cities as testbeds, annual energy consumption of two types of modern residences are determined through a series of simulation sessions with different building settings. The impacts of key building characteristics, including building insulation, air tightness, orientation, location, and residence type, are carefully investigated. Sample utility bills are then collected to validate the simulated results, resulting in three adjustment parameters for normalization, including ‘number of residents’, ‘total floor area’, and ‘air conditioning comfort level’, for justification of occupant behaviors in different living conditions. Study results not only provide valuable benchmarking data serving as references for performance evaluation of different energy-saving strategies, but also show how effective extended building insulation, enhanced air tightness, and prudent selection of residence location and orientation can be for successful implementation of building sustainability in tropical and subtropical regions.

Analysis on Aging Characteristics of Composite Insulators

Composite insulator was widely used in the power grid because its excellent performance. Aging issue of composite insulators was appeared with the long-term operating. The internal structure of silicone rubber may be changed with the broken of macromolecular chains of silicone rubber, because long-term operating in the environments of surface discharge, ultraviolet, pollution and other harsh conditions. In order to study the aging characteristics of composite insulator at the different operating life, the components and thermal stability were analyzed using fourier transform infrared spectroscopy (FTIR) and thermal gravimetric analysis (TGA) respectively. The results of FTIR showed that silicon rubber composition in composite insulator changed slightly with different operating life, especially in the internal surface. However, the absorption peaks of Si-CH3 and Si-O-Si on external surface of the insulator were decreased obviously with operating life longer. The thermal gravimetric analysis results showed that the thermostability of composite insulator was almost not changed with different operating life. The temperature of 5% weightlessness was between 320°C to 335°C. It illustrated that the composite insulator had a good thermostability at room temperature and qualitative change wouldn't occur for a long time laying aside. The study of the aging characteristics of composite insulators will provided the reference for performance evaluation of running composite insulators.

Effect of profiles on ac contamination flashover performance of large-tonnage suspension disc insulators

From field experience and laboratory experiments, it was indicated that the flashover performance of contaminated insulators was significantly influenced by the insulator geometry. In the paper, insulators with three different profiles including seven types of deep under-ribs disc insulator, three types of two-shed disc insulator and three types of three-shed disc insulator were tested in an artificial climate chamber to investigate the influences of insulator profile parameters on the flashover performance of large tonnage disc insulators. The artificial contamination test results indicated that 50% flashover voltage stress (E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">50%</sub> ) decreased with the increasing insulator diameter and creepage distance. The influence of salt deposit density (SDD) was also investigated, and it was found that E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">50%</sub> of alternating-shed insulator decreased more rapidly than that of deep under-ribs insulator with the increase of SDD. An empirical expression was proposed, by employing the least-square method, to describe the relationships between E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">50%</sub> and insulator configuration parameters as well as SDD. Through analyzing the generalized fitting coefficients (r) of the equation and the standard error of estimate (s), it can be concluded that the calculated results are in good agreement with the experimental data. Moreover, special attentions were also paid to the influence of the under-ribs and the ratio of shed overhang distance to the shed spacing on flashover performance respectively. This work can enrich the investigation of insulators parameters and may provide useful reference for performance evaluation and selection of insulators in EHV and UHV transmission lines.

Performance Comparison of Typical Built-In UHF Sensors Used for GIS PD Detection

The UHF method is one of the most important partial discharge (PD) detection means for GIS, while sensor technique is the key factor of the UHF method. In comparison with external sensors, built-in sensors can achieve higher sensitivity. In this paper, two parameters were quoted to evaluate the performance of the sensor, which are He and S11. He refers to the PD detection sensitivity of sensor; S11 refers to the impedance matching property of the sensor. The paper firstly designed a simulation model of sensor performance evaluation, and then studied the performance differences of four typically used or researched built-in UHF sensors (i.e., disc-type, dipole-type, spiral-type and logarithmic-type) by simulation tools of CST. The conclusions of the paper can provide a reference for performance evaluation and type selection of UHF built-in sensor. Keywords: Gas Insulated Switchgear (GIS), Partial Discharge (PD), UHF, Sensor, Sensitivity

The Research of Shear Property of SBS Modified Asphalt and Aggregated Rock

In view of the limitation that happens when the adhesion between SBS modified asphalt and aggregated rock is evaluated by water-boiling method, on the basis of adhesion mechanism analysis of asphalt and aggregated rock, we design the evaluation method of the adhesion between asphalt and aggregated rock based on shear test, advance the quantitative index to evaluate the adhesion——shear strength, and validate the feasibility of shear strength index, analyze how the type and dosage of SBS modifier and the temperature of test influence the adhesive effect of SBS modified asphalt and aggregated rock. Result shows that The incorporation of SBS significantly improve the adhesion of asphalt and stone , especially the effect of star-modified asphalt and with the increase of dosage of SBS ,the adhension of asphalt and stone significantly increased, the shear strength of SBS modified asphalt and stone is increased about 100% than matrix asphalt when the dosage is 4%. It also describes that the shear strength index can quantitatively evaluate the effect of asphalt binder and aggregates to provide a reference for performance evaluation and quality control of modified asphalt .

Robust Controllers Using Generalizations of the LQG/LTR Method

This paper deals with the design of robust fixed parameter controllers, using the target feedback loop/loop transfer recovery (TFL/LTR) technique with two controller structures that will be evaluated with sets of specifications for robust stability and performance of a laboratory helicopter. This helicopter is an underactuated nonlinear system, having three degrees of freedom and two actuators. The first structure considered in the evaluation is the LQG/LTR compensator; it is used as reference for performance evaluation. The second structure results from a variation of the LQG/LTR method. It does not have a specific name and in this paper is called structure #2. For both techniques, designed compensators shall solve the problem of tracking of reference trajectories, ensuring performance and stability, despite parametric disturbances.

USING A DECISION-MAKING PROCESS TO EVALUATE EFFICIENCY AND OPERATING PERFORMANCE FOR LISTED SEMICONDUCTOR COMPANIES

Today’s high-tech industries face increasing competition and challenges. Thus, for hightech companies, making effective use of resources to enhance business performance and maintain the competitive advantage in the market has become increasingly important. Therefore, this study aimed to design a decision-making model for evaluating the efficiency and operating performance of Taiwan’s listed semiconductor companies in 2010 to provide a basis for improving business performance. In view of this, this study combines data envelopment analysis (DEA) and improved grey relational analysis (IGRA) as efficiency tools to measure relative efficiencies; the semiconductor companies are divided into two groups, efficient and inefficient. We then integrate the multiple criteria decision making (MCDM) method (e.g. VlseKriterijumska Optimizacija I Kompromisno Resenje, VIKOR), IGRA and the entropy weight method to evaluate the operating performance of the efficient and inefficient groups, respectively. Establishing a reasonable, objective and valid evaluation model to measure semiconductor companies’ operating efficiency can provide company managers, investors and policy makers with a reference for performance evaluation.

Study on Numerical Simulation Analysis of Creep Model for Tianjin Tower

Tianjin tower is the landmark building of Tianjin, and is of out-of-codes super high-rise concrete filled steel tube (CFST)-steel reinforced concrete (SRC) hybrid structure. As to this type of architecture, the impact of creep on the concrete work construction cannot be ignored. Considering the complexity of creep calculation of the integral structure, the simplified creep calculation model will be adopted for the construction simulation in this paper. The comparison with the results of on-site construction monitor shows that the simplified model is reasonable and practical. Additionally the analysis on the impact of creep on CFST structure is made, providing theoretical and practical references for performance evaluation of the structure of Tianjin Tower and the selection and optimization of construction methods of Tianjin Tower.

Performance optimization of a thermoelectric generator element with linear, spatial material profiles in a one-dimensional setup

Abstract

Discussion on the Method of Pushover with Cyclic Loading

The cyclic loading pushover method which can simulate the real ground motion are suggested, and the target displacements of cyclic loading are discussed to overcome the drawbacks of traditional Pushover method which cannot consider the important seismic response of plane frames under earthquake, such as cyclic loading history, duration of strong motion, and the cumulative damage of structures. Through the comparison analysis of the story drift and hysteretic energy of plane framed structures gotten by adopting cyclic loading pushover method, traditional pushover method, and dynamic elastic-plastic time-history analysis method respectively, the conclusion that cyclic loading pushover method can better reflect the loading process with ground motion and the cumulative disruptive effect caused by hysteretic energy of structure can be obtained ,which provides some references for performance evaluation of elastic-plastic analysis of seismic structures.

天基可见光相机探测距离仿真分析

The range of detection is one important specification for expressing the ability of detection and recognition of space-based optical camera.According to the principles of photometry and radiometry,through analysis of the target luminosity characteristics,the sky background characteristics and the CCD SNR characteristics,SNR model was established.According to the connection between the pixel numbers and the detection result,the relationship among SNR,detection distance and detection result was obtained.At last,taking the SBV sensor developed by American,the simulation and calculation were made through Matlab.All of this can provide reference for performance evaluation of the space-based optical detection and the sensor design.

An analytical framework for managing container terminals

This study aims to empirically develop a reference for terminal operators to evaluate their operational performance. This paper starts with a discussion on container terminal operations and the development of global container terminal operators. In this study, we applied data envelopment analysis (DEA) as a quantitative analytical tool to measure and evaluate the efficiency of global container terminal operators. In addition, we used regression modelling as a tool to formulate two regression equations as a reference for performance evaluation by container terminal operators. Our findings indicate that efficient global terminal operators are global stevedores. Accordingly, we propose a 'PROFIT' framework, which consists of the dimensions of productivity, regional coverage, operating efficiency, focus of business, internationalisation and terminal network, which is useful for a container terminal to manage their terminal operations and development.

Analyzing a web-based system's performance measures at multiple time scales

Web and e-commerce workloads are known to vary significantly from hour to hour, day to day, and week to week. The causes of these fluctuations are changes in the number of users visiting a site and the mix of services they require. Since the workloads are known to vary over time, one should not simply choose an arbitrary time interval and consider it as a reference for performance evaluation. We conclude that times scales are of great importance for operational analysis, particularly for systems with bursty loads. Service level agreements must certainly take into account measurement time scales. Similarly input parameters for predictive models are sensitive to time scale. Ultimately, a time scale should be chosen for service level requirements that best expresses the needs of end-users and the price the owner of a site is willing to pay for QoS.