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Dynamics of dominant tree species in a forest ecotone on the northern slop of Changbai Mountain 被引量:4
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作者 YU Da-pao ZHAI Lian-jiang +1 位作者 WANG Qing-li DAI Li-min 《Journal of Forestry Research》 SCIE CAS CSCD 2006年第3期216-220,共5页
The competition and dynamics of dominant trees species in the forest ecotone between the broad-leaved/Korean pine (Pinus koraiensis) mixed forest and the spruce-fir forest (also known as dark conifer forest) in Ch... The competition and dynamics of dominant trees species in the forest ecotone between the broad-leaved/Korean pine (Pinus koraiensis) mixed forest and the spruce-fir forest (also known as dark conifer forest) in Changbai Mountain, Jilin Province in Northeast China were studied by using Lotka-Volterra model, based on the data from twenty-eight sample plots with area of 20 mx90 m for each one. Results showed that under natural condition, differentiation of communities followed two directions: one would be Spruce (Picea jezoensis and few P. koraiensis) and fir (Abies nephrolepis) co-dominant conifer forest, and at the equilibrium fir was absolutely preponderant (77.1% of relative dominance (RD)); the other would be the conifer and broad-leaved mixed forest, and at equilibrium, the broad-leaved tree species was 50% of RD in the broad-leaved/Korean pine mixed forest and 66% of RD in the broad-leaved and spruce-fir mixed forest. The study demonstrated that both broad-leaved/Korean pine mixed forest and dark conifer forest were climax community, the ecotone had transitional characteristics, and the diversification of the forest communities suggested that the direction of succession was affected by local habitat. 展开更多
关键词 competition and dynamics Lotka-Volterra model Forest ecotone Changbai Mountain
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Research of Dynamic Competitive Learning in Neural Networks
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作者 PANHao CENLi ZHONGLuo 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第2期368-370,共3页
Introduce a method of generation of new units within a cluster and aalgorithm of generating new clusters. The model automatically builds up its dynamically growinginternal representation structure during the learning ... Introduce a method of generation of new units within a cluster and aalgorithm of generating new clusters. The model automatically builds up its dynamically growinginternal representation structure during the learning process. Comparing model with other typicalclassification algorithm such as the Kohonen's self-organizing map, the model realizes a multilevelclassification of the input pattern with an optional accuracy and gives a strong support possibilityfor the parallel computational main processor. The idea is suitable for the high-level storage ofcomplex datas structures for object recognition. 展开更多
关键词 dynamic competitive learning knowledge representation neural network
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Dynamic aggregation evolution of competitive societies of cooperative and noncooperative agents
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作者 林振权 叶高翔 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第5期572-586,共15页
We propose an evolution model of cooperative agent and noncooperative agent aggregates to investigate the dynamic evolution behaviors of the system and the effects of the competing microscopic reactions on the dynamic... We propose an evolution model of cooperative agent and noncooperative agent aggregates to investigate the dynamic evolution behaviors of the system and the effects of the competing microscopic reactions on the dynamic evolution. In this model, each cooperative agent and noncooperative agent are endowed with integer values of cooperative spirits and nonco- operative spirits, respectively. The cooperative spirits of a cooperative agent aggregate and the noncooperative spirits of a noncooperative agent aggregate change via four competing microscopic reaction schemes: the win-win reaction between two cooperative agents, the lose-lose reaction between two noncooperative agents, the win-lose reaction between a coop- erative agent and a noncooperative agent (equivalent to the migration of spirits from cooperative agents to noncooperative agents), and the cooperative agent catalyzed decline of noncooperative spirits. Based on the generalized Smoluchowski's rate equation approach, we investigate the dynamic evolution behaviors such as the total cooperative spirits of all coop- erative agents and the total noncooperative spirits of all noncooperative agents. The effects of the three main groups of competition on the dynamic evolution are revealed. These include: (i) the competition between the lose-lose reaction and the win-lose reaction, which gives rise to respectively the decrease and increase in the noncooperative agent spirits; (ii) the competition between the win-win reaction and the win-lose reaction, which gives rise to respectively the increase and decrease in the cooperative agent spirits; (iii) the competition between the win-lose reaction and the catalyzed-decline reaction, which gives rise to respectively the increase and decrease in the noncooperative agent spirits. 展开更多
关键词 dynamic evolution in competitive societies cooperative and noncooperative agents win-win andlose-lose reaction win-lose reaction
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STUDIES ON THE DYNAMIC COMPETITIVE ADSORPTION OF ORGANIC VAPORS ON THE ACTIVATED CARBON FIBERS ACTIVATED WITH PHOSPHORIC ACID
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作者 FU Ruowen LIU Ling +1 位作者 GUO Xindong ZENG Hanm in 《Chinese Journal of Reactive Polymers》 2000年第2期97-104,共8页
The dynamic competitive adsorption behaviors of different binary organic vapor mixtures on ACF-Ps under different operation conditions were investigated by gas chromatography in this paper. The studied mixtures includ... The dynamic competitive adsorption behaviors of different binary organic vapor mixtures on ACF-Ps under different operation conditions were investigated by gas chromatography in this paper. The studied mixtures included benzene/toluene, toluene/xylene, benzene/isopropylbenzene, ethyl acetate/toluene and benzene/ethyl acetate. Experimental results show that various ACF-Ps, as with ACF-W, can remove both vapors in binary vapor mixtures with over 99% of removal efficiency before the breakthrough point of the more weakly adsorbed vapor. In dynamic competitive adsorption, the more weakly adsorbed vapor not only penetrates early, but also will be displaced and desorbed consequently by stronger adsorbate and therefore produces a rolling up in the breakthrough curve. The ACF-Ps prepared at different temperatures have somewhat different adsorption selectivity. The feed concentration ratio of vapors, the length/diameter ratio and the thick of bed have effect on competitive adsorption. The competitive adsorption ability of a vapor is mainly related to its boiling point. Usually, the higher the boiling point, the stronger the vapor adsorbed on ACF-P. 展开更多
关键词 activated carbon fiber phosphoric acid activation dynamic competitive adsorption binary organic vapor mixture
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The influences of Organizational Routines on Establishing Dynamic Competitive Advantages
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作者 Yurong Gao Liuying Yin 《Chinese Business Review》 2004年第7期31-36,共6页
As an important part in unique resources and capability of enterprises, organizational routines, on one hand, promote the success of enterprises, on the other hand, influence the future development of enterprises. Esp... As an important part in unique resources and capability of enterprises, organizational routines, on one hand, promote the success of enterprises, on the other hand, influence the future development of enterprises. Especially, organizational routines have the influences on the two factors of building up dynamic competitive advantages-strategic change and strategic flexibility and further influence the establishment of dynamic competitive advantages. This paper involves detailed analysis on the influences of organizational routines and on the approaches of establishing dynamic competitive advantages and puts forward the relevant countermeasures. 展开更多
关键词 organizational routines strategic change strategic flexibility dynamic competitive advantages
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A novel chaotic stream cipher and its application to palmprint template protection 被引量:3
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作者 李恒建 张家树 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第4期102-111,共10页
Based on a coupled nonlinear dynamic filter (NDF), a novel chaotic stream cipher is presented in this paper and employed to protect palmprint templates. The chaotic pseudorandom bit generator (PRBG) based on a cou... Based on a coupled nonlinear dynamic filter (NDF), a novel chaotic stream cipher is presented in this paper and employed to protect palmprint templates. The chaotic pseudorandom bit generator (PRBG) based on a coupled NDF, which is constructed in an inverse flow, can generate multiple bits at one iteration and satisfy the security requirement of cipher design. Then, the stream cipher is employed to generate cancelable competitive code palmprint biometrics for template protection. The proposed cancelable palmprint authentication system depends on two factors: the palmprint biometric and the password/token. Therefore, the system provides high-confidence and also protects the user's privacy. The experimental results of verification on the Hong Kong PolyU Palmprint Database show that the proposed approach has a large template re-issuance ability and the equal error rate can achieve 0.02%. The performance of the palmprint template protection scheme proves the good practicability and security of the proposed stream cipher. 展开更多
关键词 chaotic stream cipher coupled nonlinear dynamic filter biometric protection cancelable competitive code
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Flexible Tropism of the Enterprises' Organization in Uncertain Competitive Environment
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作者 Shoufeng Zhang Ronggui Luo 《Chinese Business Review》 2005年第3期6-10,62,共6页
With the rapid development of the computer network, communication technology and the economic globalization, the competition environment faced by the enterprises has been more and more complicated. While the interacti... With the rapid development of the computer network, communication technology and the economic globalization, the competition environment faced by the enterprises has been more and more complicated. While the interactive competition becomes more and more fierce, it has been more and more difficult for enterprises to keep sustainable advantages in competition. In this paper the author mainly discusses the severe challenge of the new competition conditions to the traditional hierarchical structure and the reason why flexible organization will be the inevitable strategy selection of the enterprises. 展开更多
关键词 flexible organization dynamic competitive environment uncertainty dynamic alliance
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A Study on IPO of CITIC Securities Company
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作者 Chao Chen Wuyang Zhao 《Frontiers of Business Research in China》 2012年第3期435-446,共12页
On January 6, 2003, CITIC Securities Co., Ltd. (CITICS hereafter) issued A-shares in the Shanghai Stock Exchange to become the first public listed securities company through IPO in China. CITICS's net capital rose ... On January 6, 2003, CITIC Securities Co., Ltd. (CITICS hereafter) issued A-shares in the Shanghai Stock Exchange to become the first public listed securities company through IPO in China. CITICS's net capital rose to about 5 billion yuan, much higher than any other competitor. This teaching case aims to demonstrate how a company gains first-mover advantage as being the first company to go public in an industry, how its competitors respond by changing their strategies after the IPO, and consequently, how a series of relevant events influence the competition. This case offers important implications for understanding the competitive dynamics of a securities company in China. 展开更多
关键词 CITICS IPO first-mover advantage ownership structure competitive dynamics
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