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Articles by Zhang Bo
Total Records ( 3 ) for Zhang Bo
  Zhao Zhe , Xiang Yang , Zhang Bo , Zhang Qi and Pan Tao
  Microblog has been an important platform for expression of public opinion towards policy decisions. One key challenge for policymakers is to mine public opinions from microblog platforms as soon as possible. In order to deal with the challenge, this paper proposes a Topic Detection and Tracking (TDT) algorithm based on self-adjusting vector space model (VSM) and an opinion mining method based on comments. Furthermore, an innovative opinion mining system is developed, using mciroblog as the opinion mining platform and combining natural language processing techniques with similarity calculation and polarity calculation. A series of related experiments are employed to verify the efficiency and maneuverability of the algorithm.
  LI Chuan-yu , ZHANG Bo , LI Zhen-bang , HUANG Fu-lian , TIAN Shao-wen and HU Xin-tian
  ┬áIn the present experiment, Pavlovian fear conditioning was adopted to study the effects of different early rearing environments on fear conditioning in adult rats. Weaned rats were reared in three manipulable environments (enriched, social and isolated conditions). After 8 weeks, fear conditioning (characterized by percentage of freezing) was observed and analyzed, and rats’ weight, locomoter activity and foot-shock sensitivity were operated too. The results showed that: (1) Compared with control group, the level of conditioned fear was significantly increased in enriched group, but significantly decreased in isolated group; (2) Enriched and isolated conditions influenced rat’s weight significantly; (3) Different rearing conditions have no effect on locomoter activity and foot-shock sensitivity. These results indicated that early enriched condition could improve the tone-evoked fear conditioning response, while isolated condition impaired the response.
  LIU Bing-wan , QIAN Zhi-qiang , ZHANG Bo , LIU Song-tao and LI Ming
  In November, December 2007 and March 2008, we studied the diurnal activity budgets of the Mongolian Gazelle (Procapra gutturosa) using group-scan-sampling for the time before, during and after the rut around DaLai Lake, Inner Mongolia. The activities of Mongolian Gazelle were divided into 6 categories: feeding, standing, moving, lying, rutting and others. The results showed: 1) Before the rut, the major behavior of the female was feeding, the time budget of feeding occupied 44.9±3.8% of all diurnal time, the lying time was 32.3±4.8%; During the rut the females spent 43.5±4.0% on feeding and 29.2±2.9% on lying; After the rut the time budget of feeding occupied 46.2±3.1% of all diurnal time, the lying time was 28.0±4.8%. Activity budgets of the female on standing, rutting, others changed significantly among the three periods (P<0.05),but activity budgets on feeding, moving, and lying did not change significantly among the three periods (P>0.05). 2). Before the rut, the major behavior of the males was feeding, the time budget of feeding occupied 52.6±3.8% of all diurnal time, the lying time was 13.4±6.4%; During the rut the males spent significantly less time on feeding (17.5±2.8%) and more time on lying (24.2±4.1%) compared with before the rut. After the rut, the time budget of feeding occupied 29.8±4.8% of all diurnal time, while the lying time was 44.2±4.7%. Activity budgets of the male on feeding, standing, moving, lying, rutting, others changed significantly among the three periods (P<0.05). The time budget on feeding and lying reflects on energy balance strategies. We conclude from the results that; females do not change their strategy significantly among the three periods - they try to increase their energy intake; before the rut, the male is the same as the female, but during and after the rut, the males adopt an energy saving strategy to optimize their energy balance; males aim to save energy by spending more time lying.
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