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Articles by Lei Feng
Total Records ( 4 ) for Lei Feng
  Fei Liu , Babangida Lawal Yusuf , Jianli Zhong , Lei Feng , Yong He and Li Wang
  Visible and near infrared spectroscopy was investigated to identify the varieties of rice vinegars based on back propagation neural network and least squares-support vector machine. Five varieties of rice vinegars were prepared. Partial least squares discriminant analysis was implemented for calibration and extraction of partial least squares factors. The factors were used as inputs of back propagation neural network and least squares-support vector machine. Finally, back propagation neural network and least squares-support vector machine models were achieved. The threshold value of prediction was set as ±0.1. An excellent precision and recognition ratio of 100% was achieved by both methods. Simultaneously, certain effective wavelengths were proposed by x-loading weights and regression coefficients. The performance of effective wavelengths was validated and an acceptable result was achieved. The results indicated that visible and near infrared spectroscopy could be used as a rapid and high precision method for the identification of different varieties of rice vinegars.
  Lifang Qiao and Lei Feng
  The satisfaction of residents, as the users of the community greenland environment, is the measure of the service quality of the community greenland environment. Post Occupancy Evaluation (POE) of the community greenland provides an effective method. The research on the difference between the service quality perceived by the public and the service quality of their expectation is helpful to the discover the problem existing in the construction of community greenland environment. It also provides the basis to the renovation of the community greenland. In this article, SERVQUAL (Service Quality) model was improved to adapt to the POE of the service quality of the community greenland environment. The weight calculation for the evaluation hierarchical structure was carried out by AHP method and SD software. Cronbach's Reliability Alpha shows the high consistency of the survey questionnaire as well as the reasonable structural validity of the questionnaire with KMO value of the factor analysis larger than 0.5 and the value of factor loading larger than 0.7. The result shows that there is a great difference in the service quality of different community greenland environments. SERVQUAL model can be used as the basis for the service quality evaluation and comparison of the community greenland environment. The results will be important for the renovation and the construction of the community greenland environment.
  Yichuan Zhang and Lei Feng
  Good educational environment and recreational site are essential to children's healthy growth. Taking scientific approaches to evaluate and optimize will promote the construction of children’s recreational center. This study constructed an AHP (Analytic Hierarchy Process)-TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) optimization model which consisted of the following seven influential factors: site safety (x1), amenities (x2), physical space (x3), activity representation (x4), ecological environment (x5), quality of night scene (x6) and consideration given to supervisor (x7). The AHP method was used to determine the weights of each factor and then the values were assigned to the sample cases in accordance with the evaluation criteria. After that, the TOPSIS was employed to sequence and optimize 28 design proposals of children's recreational center. The result showed that the decreasing order of the weight of each influential factor of the quality of children’s recreational center was x1>x4>x2>x3>x6>x7>x5. Moreover, the sequencing of 28 design proposals had a high differentiating ability. The excellent design proposals that had been screened out were featured by a good balance between the core functions of the recreational center and other auxiliary functions. The AHP-TOPSIS combination model can provide scientific basis for optimizing the design proposal of children’s recreational center and for standardizing the construction of children’s recreational center.
  Lifang Qiao and Lei Feng
  The optimization of design proposal of community environmental landscape plays an important role in the reasonable construction of community environment. In this article, the indexes influencing the optimization of community environmental landscape were selected and an index system containing three layers was established. Among the three layers, criterion layer concerned eco-environment, aesthetics environment, place environment, cultural environment and facilities environment, etc. and index layer involved 15 indexes. ANP (Analytic Network Process) model was established in accordance with the impact relationship between the design proposal and evaluation index of community environmental landscape. Supper Decisions (SD) software was used to calculate data as an assistant approach. According to this model, the hybrid weight of 15 impact factors and the comprehensive advantage measure of 3 proposals were calculated and the optimal proposal was determined. ANP model was suitable for the optimization decision of design proposal of community environmental landscape and SD software provided a computerized approach of ANP model calculation, which made possible a simplified process and calculation of optimization.
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