Hunan Radio and Television University

Computer-Aided Design and Applications is an international journal on the applications of CAD and CAM. It publishes papers in the general domain of CAD plus in emerging fields like bio-CAD, nano-CAD, soft-CAD, garment-CAD, PLM, PDM, CAD data mining, CAD and the internet, CAD education, genetic algorithms and CAD engines. The journal is aimed at all developers and users of CAD technology to ptovide CAD solutions for various stages of design and manufacturing. The journal publishes all about Computer-Aided Design and Computer-Aided technologies.

ABSTRACT Understanding of orchard nutrition status can facilitate the proper management of orchards for higher fruit yield and quality. From 2011 to 2019, the nutrition status of orchards in Hunan Province, a major citrus-producing area in china, were assessed. A total of 361 soil samples, 378 leaf samples and 285 fruit samples of sweet oranges including navel orange (citrus sinensis l. Osbeck ‘newhall’) and common sweet orange (citrus sinensis l. Osbeck ‘bingtangcheng’), and mandarins including satsuma mandarin (citrus unshiu marc. ‘miyagawa’) and ponkan (citrus reticulata blanco ‘xinnu’) were collected. These samples were from112 sweet orange orchards and 140 mandarin orchards. Parameters of soil, leaf and fruit nutrition and fruit quality were analyzed based on these samples. The results revealed that soil acidification occurred in 79.0% of sweet orange orchards (ph 3.56 to 8.12) and 74.7% of mandarin orchards (ph 2.75 to 8.15). Soil organic matter (om) was abundant in both sweet orange orchards (21.3 g/kg on average) and mandarin orchards (19.77 g/kg on average). Nutrient analysis demonstrated deficiencies of nitrogen (n), potassium (k) and boron (b) in soils and leaves of sweet orange and mandarin orchards. Zinc (zn) was abundant in soils but deficient in leaves, suggesting a low zn utilization efficiency in these orchards. Besides, excessive iron (fe), magnesium (mn) and copper (cu) were found in sweet orange and mandarin leaves, which may be associated with low soil ph and fungicides application in this area. The average contents of n, phosphorus (p) and k in the fruit were about 0.80%, 0.11% and 0.51%, respectively, with a ratio close to 1:0.14:0.6. Multiple linear regression (mlr) analysis revealed that leaf npk and molybdenum (mo) significantly affect fruit fresh fruit weight (ffw) and total soluble solids (tss), and leaf p is closely correlated with fruit titratable acid (ta).

ABSTRACT A vertical layered cooling process is developed to get more uniform cooling and higher heat transfer efficiency when compared with the circular-type and vertical integrated sinter cooling processes in this work, which has been demonstrated by the example. Based on the vertical layered cooling process, the maximum temperature of the cooled sinter and the minimum waste heat recovery is treated as two objective parameters for the multi-objective optimization design. The operating parameters influencing the sinter temperature and waste heat recovery are determined at first. Then, an accurate metamodel is established based on the Latin hypercube sampling technique and radial basis function neural network (RBFNN) approach. Finally, the non-dominated sorting genetic algorithm II (NSGA-II) is employed to iterate the accurate metamodel and acquire the Pareto frontier for acquiring the optimal combinations of the objective parameters. Analysis results are demonstrated to be of great significance for practical engineering applications.

In order to overcome the problem that the accuracy and efficiency of Mandarin emotion recognition is low based on singal-modal, a tri-modal Mandarin emotion recognition method based on the feature-level fusion of three important modal of speech, facial expression and body gesture is proposed. Firstly, different emotional features are extracted from speech, facial expressions and body gestures, and then the three modal emotion features are fused by IAGA method. Finally, SVM classifier is used to construct prediction model and emotion recognition is completed on it. The CHEAVD Chinease multi-modal emotion dataset is utilized to evaluate our proposed methods. Compared with the traditional mono-modal and dual-modal emotion recognition, the experimental results show that the dual-modal fusion has higher emotion recognition rate than the mono-modal, and the tri-modal fusion has higher emotion recognition rate than the dual-modal, which verifies the effectiveness of the tri-modal Mandarin emotion recognition

The “Internet+” has become an inevitable trend of social development. The collision and integration of internet and education industry are also deeper, which sets off the upsurge of establishing open universities. As a new, convenient and interactive mode of education, open university is gradually recognized and accepted by the public. The key to construct open universities well is to construct the teaching faculty in open universities. This paper mainly discusses the construction of teaching faculty in open university based on the mobile internet environment, then discusses the necessity to construct the teaching faculty in open universities from the state to the education and to the teachers, finally discusses the construction strategy of the construction of teaching faculty in open universities based on internet from the aspects of university and teacher.

Along with the constant advance of agricultural modernization and new-type urbanization construction, the financing demand increases continuously, and a huge financing gap appears. This paper firstly introduces the development history of China’s agricultural modernization and urbanization, forecasts the development tendency adopting the logic growth curve model, and then calculates the financing gap of agricultural modernization and new-type urbanization construction based on ARIMA model.

To alleviate the pressure of data size, data transmission and data processing in the huge data dimension of the Internet of things., data classification is realized based on back propagation (BP) neural network algorithm. The working principle is deduced in detail. For the shortcomings of slow convergence and easy to fall into the local minimum, the combination of variable learning and momentum factors is used to improve the traditional back propagation algorithm. The results show that the optimized algorithm improves the convergence speed of the network to a certain extent. Therefore, it is concluded that the back propagation neural network has higher classification success rate when classifying multidimensional data in Internet of things.

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Online education, as a new form of educational innovation, is spreading rapidly around the world. Based on the research of Public English online tutoring design and practice by the teaching team, the paper discusses the implementation and evaluation of the online tutoring of Public English. It showed the building of the learning resources, interaction construction, and learning evaluation to explore a new "learner centered" learning support service mode for distance learning so as to stimulate students' interest in learning, reinforcement learning initiative of students, improve the self -learning ability. It hopes to give a contribution to the building of the lifelong education system in China.

Distance learning system has become a significant teaching means; this technology is becoming mature and penetrating in teaching practice of each subject. This study researches design and application of tablet computer control system in distance education platform for new professional peasants. The system designed in this paper consists of computer client, tablet computer, projector and wireless access point. Computer client is the center. Tablet computer is connected with the computer client via wireless access point. The project is connected with computer client. Operation on tablet computer sends to computer client in the form of message. Analysis execution is conducted at computer client to operate courseware contents at computer client via tablet computer. This reaches the objective of synchronously displaying courseware contents. Transmission of courseware contents through screenshot has a wide range of applications and strong universality.