Papers by Author: Wei Liu

Abstract: The aim of this paper is to study cognitive load in the virtual maintenance training. This paper first introduces the concept of virtual maintenance training, looks back the study history of actuality and sketches the current development in the virtual maintenance training. And then, it studies cognitive load in the virtual maintenance training. In this part, this paper talks about the impact of cognitive load on the virtual maintenance training and analyzes the sources of cognitive load and the strategy to reduce cognitive load. At the same time, it points out the measurement methods for the cognitive load in the virtual maintenance training. In the last part, the research foreground for cognitive load in the virtual maintenance training is proposed.

Abstract: Objective to establish a system to evaluate the mental workload on visual display interface in airplane cockpit after synthesizing three kinds of mental workload assessment techniques, i.e. main task measure method, physiology measure method and subjective evaluate method. Methods The evaluation indices of every kind of assessment techniques was defined, and the amount of each index through experiment and subjective inquiry was gained, weighted average was calculated and a quantification evaluation value of each kind of evaluation methods was got. At last, with weighted calculation of above three evaluation values, the evaluation value of mental workload on visual display interface in airplane cockpit was obtained Results in M kinds of different designs of visual display interface in airplane cockpit, the synthetic evaluation value of one design was the smallest and the mental workload of this design was the smallest. The design of the smallest mental workload was chosen prior as the final scheme of visual display interface in airplane cockpit .Conclusion The evaluation system is combined with present main evaluation methods of mental workload and utilizes their advantages. The evaluating results can be quantified more directly and clearly. With this evaluation system, the mental workload can be evaluated during the design of visual display interface of airplane cockpit and the best scheme can be confirmed.

Abstract: Objective To study expert and novice eye movement pattern during simulated landing flight for providing references to evaluate flight performance and training of pilots. Methods The subjects were divided in to two group s of expert and novice according to their flight simulation experience. Eye movement data were recorded when they were performing landing task. Comparison of expert and novice flight performance data and eye movement data was made. Results It was found that the differences between expert and novice lay not only in flight performance but also in eye movement pattern. Performance of expert was better than novice. Expert had shorter fixation time, more fixation points, faster scan velocity, greater scan frequency and wider scan area than novice. It was also found that eye movement pattern of expert bring lower mental workload than novice. Conclusion Flight performance is related to eye movement pattern. Effective eye movement pattern is related to good flight performance. The analysis of eye movement indices can evaluate pilots’ flight performance and provide reference for flight training.

Abstract: The method of computer-aided conceptual design is present for the palletizing robot. Intelligent design and modeling are integrated in this system. Index of design requirement is quantified hierarchically and various kinds of attributes of function carriers are digitized. The analytic hierarchy process is used for reference to check the consistency of quantitative value of attributes and the rationality is ensured. Design requirement can be configured flexibly in man-computer interaction module and the optimal scheme is generated automatically according as the computation of evaluation function. Model file of virtual prototype for ADAMS can also be generated automatically by auto-modeling module. Software system of computer-aided conceptual design for palletizing robot is developed based the method mentioned above.

Abstract: Due to its portability, mobile terminals (mobile phones and similar devices) have become an transfer of information, between people as well as an important tool for network access. Based on user behavior analysis, using the information of data warehouse will be a reasonable quantification of qualitative indicators, draw the user a variety of potential semantic behavior, and user clustering and dimension reduction, the establishment of a recommendation based on user behavior analysis model . This paper based on user behavior analysis, first extract the user factors into the model are data on these factors reduce the dimensions of the conclusion that the targeted user recommendation system, and such user back into the model test to verify the target User's accuracy.

Abstract: With the development of aviation equipment automation, the research on situation awareness (SA) of pilots has become an active direction in the field of aviation ergonomics. Based on the research of the development of SA history, the concept, the impacting factors and the analysis of qualitative model, and combined with previous research results, the paper has established a new definition of SA and the corresponding multi-level trigger qualitative analysis model, which has laid a foundation for further design of virtual experiments and the establishment of quantitative simulation model.

Abstract: Memory depth of processing theory suggests that the factors affecting memory has nothing to do with the time but the processing level. Network label is the emerging Web 2.0 in the navigation mode. In this paper, memory processing of in-depth perspective of a comparative test was designed to explore the network of label design, and give the theoretical proof to the direction of its development.

Abstract: Objective: The aim of this paper is to study the system problem to help pilots get the information which is useful among large amounts of data; Method: A new experiment on the limit of data strobe signal was built; Result: On the basis of theoretical consideration and analysis of experimental results, the effect on pilots' cognition and the design of display/control system was initially explained; Conclusion: The results showed that the increase of limit of data strobe signal can be accepted by objects; limit of data strobe signal will increase quickly by using digital or simple characters instead of words, but this will slightly increase performance errors; interruption of information doesn’t affect too much on limit of data strobe signal.

Abstract: User-centered design plays a significant part in product design. GOMS user behavior model analyze the interface from the aspects of both users and objects, which helps the designers to create a user-friendly interface in an efficient way. In this paper, GOMS model was used to predict the efficiency of the two versions of input interface on a touch-screen mobile phone. In addition, the experiment was conducted to collect the data under the real scenarios, and paired-sample T test was employed to analyze the data. The results indicate the GOMS prediction model can be used to evaluate the efficiency of the mobile phone interface.

Abstract: The method of computer-aided design oriented to requirement configuration is present for the palletizing robot. Index of design requirement is quantified hierarchically. The whole function of palletizing robot is decomposed according to the working plane. The various kinds of attributes of function carriers are digitized and the consistency is kept with the index of design requirement. Optimal design scheme can be gotten by the computation of evaluation function constructed in this paper. The software of computer-aided conceptual design for palletizing robot is developed.