The properties of maximal fan designs in relation to structural characters and maximal number of maximal fan designs are obtained 摘要研究了最大扇設(shè)計(jì)有關(guān)結(jié)構(gòu)特征和最大個(gè)數(shù)的性質(zhì)。
At the end of this paper we talk about the question of the maximal number of limit cycles in quadratic system and some applied uses in ecological circumstances 在本文的最后略為涉及hilbert第十六問(wèn)題中的極限環(huán)的個(gè)數(shù)問(wèn)題及其在生態(tài)環(huán)境上的應(yīng)用。
Though the temporal projection, the maximal number of the signals this method can deal with is much more than present algorithms with a small cost 該算法通過(guò)時(shí)域投影對(duì)信號(hào)進(jìn)行預(yù)處理,先從時(shí)域上對(duì)信號(hào)進(jìn)行粗分,從而以較小的代價(jià)換取大信號(hào)數(shù)情況下算法性能的改善。
In this way, we solve the open problem of hofbauer and so partially, and give an negative answer to their conjecture about the maximal number of the limit cycles in such systems . at the same time, we construct the examples of a non-competitive and a prey-predator three dimensional lotka-volterra system with two limit cycles 給出了hofbauer和so的一個(gè)公開(kāi)問(wèn)題的解答,否定了他們關(guān)于三維lotka-volterra競(jìng)爭(zhēng)系統(tǒng)極限環(huán)最大個(gè)數(shù)的猜想,同時(shí)給出了非競(jìng)爭(zhēng)三維系統(tǒng)以及捕食系統(tǒng)存在兩個(gè)極限環(huán)的例子
The paper consists of two parts . in the first part, the definitions of zq-equivariant vector fields and the method of detection functions are stated . in the second part, a concrete numerical example of z8-equivariant perturbed planar hamiltonian system of of degree 7 is constructed, and for the unperturbed vector field having maximal number of centers, its global phase portraits are analyzed 本文由兩部分組成,第一部分為綜述,介紹了z_q-等變向量場(chǎng)以及判定函數(shù)法;第二部分首先討論了一類7次z_8-等變的平面hamilton系統(tǒng),研究了具有最大中心數(shù)時(shí)的hamilton系統(tǒng)可能存在的部分全局象圖。
We analyze how bit error rate ( ber ), average delay, and throughput of the two structures vary with the maximal number of transmission attempts, and find that syndrome-ahead structure is suited for short codes with poor error-correction capacity, while syndrome-behind structure is suited for long codes with powerful error-correction capacity 分析了該harq的可靠性、時(shí)延和流量與最大重傳次數(shù)之間的關(guān)系,發(fā)現(xiàn)短碼長(zhǎng)、糾錯(cuò)能力低的碼宜采用前向校正子結(jié)構(gòu),而長(zhǎng)碼長(zhǎng)、糾錯(cuò)能力高的碼宜采用后向校正子結(jié)構(gòu),二者具有互補(bǔ)性。
In the first part, hilbert's 16th problem and the studies on it are introduced, and the results of zq-equivariant vector fields of degree 5 ( q = 2, 3, 5, 6 ) are given . in the second part, the definitions of zq-equivariant vector fields and the method of detection functions are stated, and all the forms of nontrivial zq-equivariant planar polynomial vector fields of degree 7 are obtained . in the third part, a concrete numerical example of zt-equivariant perturbed planar hamiltonian system of degree 7 is constructed, and for the unperturbed vector field having maximal number of centers, its global phase portraits are analyzed ( having at least 9 topologically different phase portraits ) . then, for a given parameter group, its phase portrait trend is studied 第一部分介紹了hilbert第16問(wèn)題以及它的研究與發(fā)展現(xiàn)狀,給出了近年來(lái)利用李繼彬提出的判定函數(shù)法得出的z_q-等變(g=2,3,5,6)的5次系統(tǒng)關(guān)于它的第二部分的研究結(jié)果;第二部分介紹了z_q-等變向量場(chǎng)以及判定函數(shù)法,給出了7次平面多項(xiàng)式系統(tǒng)的所有非平凡z_q-等變向量場(chǎng)具有的形式;第三部分給出了一個(gè)7次平面擾動(dòng)hamilton系統(tǒng),研究了它的具有最大中心數(shù)的未擾動(dòng)系統(tǒng)(z_7-等變)的全局象圖,得到了9種不同的拓?fù)鋱D形。