This paper designs an automatic web crawler system which crawls music resources on the Internet. Firstly, this paper gives the architecture of the system and the function of each module; then describes the detailed design of each module; Finally, the key technologies and algorithms used in the system are given in a detailed description, including the use of χ2 statistics to select feature words, TF-IDF algorithm to calculate the weights of feature words, the correlation of web page and music theme using vector space model.

After studying of post-earthquake environment, we develop a new kind of search and rescue robot, which can go into ruin interstices to implement rescue. Through the research of track and snake-like robot that used in searching and rescuing, we design a new kind of mechanism, which has advantages of both track and snake-like robots. This article also gives some details about the modular unit of track drive mechanism of the robot, the head turning mechanism actuated by tendon-sheath, and the control method of the robot system.

Introduction: Moyamoya disease is a progressive, chronic occlusive vascular disease of the circle of Willis arteries leading to the development of collateral circulation to compensate the occlusion. Purpose: This study aims to investigate the potential causes and clinical and imaging characteristics of Moyamoya Disease (MMD) in children. Methods: A retrospective analysis was performed on the clinical data of 14 MMD children, in which the potential causes were analysed, and the clinical and imaging characteristics were observed. Results: The average patient age was 6.15 y (range 21 months-13 y), and the female/male ratio was 1.3:1.0. There were 332 cases of ischemia and 196 hemorrhages. Eight cases had inducing factors including five cases of upper respiratory tract infection. Twelve cases exhibited limb weakness or hemiplegia. Among these patients, eight cases developed these manifestations as initial symptoms. Furthermore, seven cases presented language barriers, two cases had twitch, and two cases had headaches with unclear vision. All 14 patients underwent cranial Magnetic Resonance Imaging (MRI) and the results revealed that twelve cases had cerebral infarction, and two cases had cerebral hemorrhage. Five of 14 patients experienced stenosis or occlusion at the siphon part of the bilateral internal carotid arteries, seven patients had bilateral anterior cerebral artery stenosis or occlusion, 8 were bilateral middle cerebral artery stenosis or occlusion, and 2 were bilateral posterior cerebral artery stenosis or occlusion. All patients smoke-like vessels in the basal ganglia region. Conclusion: High-risk age of child MMD ranged between 4-10 y old, which mostly manifested as transient cerebral ischemic insults; and inducing factors were mostly upper respiratory tract infections.