Applied Mechanics and Materials Vol. 598

Abstract: This paper proposes a personalized knowledge map construction method to facilitate knowledge map construction in knowledge management systems. Knowledge map is an important tool in knowledge management systems. Considering the classification habits, the providing of the personalized knowledge map can make the knowledge searching more easily. The tagging reflects the user’s classification habits. Moreover, the words in the tags reflect the user’s word using habits. Therefore, we proposed an approach to the personalized knowledge map construction. Firstly, the documents are pre-processed including eliminating the stop words and stemming the word. Secondly, the KNN algorithm is modified, in which both the vector similarity and the tagging similarity are used to calculate the similarity between the documents. Finally, the topic identification methods of the clusters are proposed. Afterwards, we evaluate the personalized knowledge map construction methods. The results show that the personalized knowledge map gets a good satisfaction.

Abstract: This research performed dynamic tests on a 1/4 scale test model of a new-styled Korean traditional wooden house to study its dynamic characteristics. The dynamic tests were performed both by the impact hammer test and the shaking table test of an El-centro N-S seismic wave. Together with these dynamic tests, structural analysis was also performed and the results were compared. The natural frequency from the impact hammer test was slightly higher than that from the shaking table test. The natural frequency from the eigenvalue analysis was about 16~33% lower than that from both the impact hammer test and the shaking table test. It can be deduced that the rotational stiffness of joints of analysis model were somewhat underestimated than those of experiment model.

Abstract: Based on fractal theory, this paper analyzed spatial structure of land use and calculated fractal dimension and stability in Shaoguan. And then the paper revealed the various types of land use spatial differentiation. The results showed that the spatial mosaic structure of woodland patches was the smallest on complexity, but strongest stability. Spatial mosaic structure of urban town rural settlements was smaller on complexity, but stronger stability. Spatial mosaic structure of cultivated land and orchard and grassland and unused land were large on complexity, but poor stability. Spatial mosaic structure of industrial land and transportation and water were larger on complexity, but less stability. The complexity and stability of each land use type spatial mosaic structure was obvious differences. The biggest difference was transportation land, followed by cultivated land, water, grassland, unused land, woodland, urban town rural settlements and orchard, industrial land spatial differentiation minimum.

Abstract: In order to study “three zones” of goaf spontaneous combustion with U+L ventilation mode working face. Numerical simulation is used to simulate the distribution law of “three zones” of goaf spontaneous combustion in case of different distance between crossheading and working face, and different air quantity. Research suggests that the “three-zones” of spontaneous combustion has great influence with different distances and different supplied air volume.

Abstract: Entertainment centers are typically equipped with flammable materials. In addition, consumers (and employees) of these establishments are relatively unfamiliar with their internal environments, escape routes, and fire safety equipment. Therefore, fire hazards often result in severe casualties and property loss. In this study, Fire Dynamics Simulator was used to simulate a severe nightclub fire recently occurred in Taiwan. Data were collected from field observations and media reports to establish a numerical model for the actual fire. Important fire dynamic parameters such as temperature distribution, smoke diffusion and carbon monoxides concentration were computed using the model. The results of this analysis can be used to formulate/analyze the firefighting and rescue tactics for similar fires, which would decrease the risk of disaster occurrence and increase rescue efficiency, thereby reducing casualties and property loss.