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双语推荐：LSA

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目的探讨胸主动脉覆膜支架并"烟囱"技术在近端锚定区不足时左锁骨下动脉(LSA)、左颈总动脉(LCCA)的处理方法及疗效。方法回顾分析近年收治的近端锚定区不足的21例胸主动脉病变患者(B型夹层11例,假性动脉瘤2例,动脉瘤1例,穿透性溃疡7例),18例病变位于LSA开口远侧,距LSA锚定区15 mm,3例病变破口位于LSA与LCCA之间。采用胸主动脉覆膜支架并LSA或LCCA"烟囱"技术治疗,观察脑及上肢缺血并发症发生情况。术后评价支架内漏、LSA或LCCA显影等。结果 21例患者均成功地在主动脉内植入覆膜支架,"烟囱"支架同时分别植入在LSA 18例,LCCA 3例。术后患者均未出现神经系统并发症及左上肢严重缺血症状。术后随访1~38个月,主动脉覆膜支架形态良好,未发现Ⅰ型内漏,"烟囱"支架内血流通畅。结论胸主动脉病变近端锚定区不足时,"烟囱"技术可延长锚定区并保持LSA或LCCA通畅,更为安全地拓展了胸主动脉病变腔内治疗的适应证,达到了微创、安全、有效的目的。
Objective To evaluate the feasibility of strent-graft with Chimney technique in thoracic endovascular aortic repair (TEVAR) of thoracic aortic dissection left subclavian artery (LSA) disease and left common carotid artery (LCCA) disease without good landing zone. Methods A total of 21 patients with thoracic aortic diseases complicated by in-sufficient proximal anchoring area,who were presented in our hospital in recent years,were selected in this study. The clini-cal data were retrospectively analyzed. The thoracic aortic diseases included aortic dissection ( n=11), aortic pseudoaneurysm (n=2), aortic aneurysm(n=1) and penetrating ulcer(n=7). Among all 21 patients,lesion was located in distal to LSA in 18 pa-tients with distance to LSA anchoring less than15 mm,and the lesion was located between the LSA and LCCA in the rest 3 patients.Thoracic aortic stent-graft placement was carried out.The ostium of LSA was intentionally and completely cov-ered by thoracic aortic stent-graft and left

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通过介绍语音增强的特点,详细分析了最小均方误差对数谱幅度估计(MMSE-LSA)算法,并提出了与MMSELSA算法相匹配的语音激活检测(VAD)算法。该方案计算简单、易于实现且语音增强效果好,能够动态地跟踪背景噪声的变化。最后通过仿真分析,比较了MMSE-LSA与其它几种语音增强算法的增强效果。
The minimum mean square error of log-spectral amplitude estimator (MMSE-LSA) algorithm is analyzed in detail by introducing the characteristics of speech enhancement, and voice activity detection (VAD) algorithm matching with MMSE-LSA algorithm is proposed. This scheme is simple and easy to implement and its speech enhancement effect is good. In addition, it can track the changes of background noise dynamically. Finally, the enhancement effect of MMSE-LSA is compared with that of other algorithms by the analysis of simulation.

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为了了解米酒乳杆菌在脂类环境中的生存状况,为改进发酵剂和发酵产品提供理论基础,用定量PCR方法对米酒乳杆菌La22在橄榄油和三丁酸甘油培养基中生长时生境适应相关基因表达进行分析。结果显示,与对照相比,无论是在添加橄榄油还是添加三丁酸甘油的MRS培养基中,米酒乳杆菌中与精氨酸脱亚氨酶途径(ADI)途径相关的6个arc操纵子基因的表达量下调十分明显,且在橄榄油中arc操纵子基因的表达量均低于其在含三丁酸甘油培养基中的表达量;压力相关基因usp5在三丁酸甘油培养基中的表达量明显下调,usp2、usp4、lsa0169和lsa0170在2种培养基中的表达量均明显下调,lsa01079的表达量在三丁酸甘油培养基中明显上调,lsa0674和lsa0697在2种培养基中的表达量均明显上调;应激基因lsa1152_b在橄榄油和三丁酸甘油培养基中的表达量明显上调,而lsa1111、lsa1112、lsa0552和lsa0619基因的表达量在三丁酸甘油培养基中明显下调。结果表明米酒乳杆菌能适应脂类丰富的培养环境,但需进一步研究来证实米酒乳杆菌对各种脂类环境的适应性。
Lactobacillus sakei is a ubiquitous heterofermentative 1actic acid bacterium that is frequent1y used as an industria1 cu1ture in vegetab1e, fish and meat fermentation. To investigate the adaptation of L. sakei in a fat/ester environ-ment and to provide fundamenta1 basis for improvement of starter cu1ture and fermented product, rea1-time quantitative PCR ( RT-qPCR) were emp1oyed to ana1yze the niche-specific genes expression re1ated to the growth of L. sakei strain La22 when grown in o1ive oi1 or tributyrin supp1emented MRS. Compared with CK, expression of six arc operon genes of L. sakei strain La22, which be1ong to the arginine deiminase (ADI) pathway, were down-regu1ated obvious1y and the expression of six arc operon genes in o1ive oi1 supp1emented MRS was 1ower than that in tributyrin supp1emented MRS. Expression of the stress response gene usp5 was down-regu1ated in MRS containing tributyrin, and genes usp2, usp4, lsa0169 and lsa0170 were under-expressed in o1ive oi1 or t

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针对文本数据高维度的特点和聚类的动态性要求,结合隐含语义分析(LSA)降维,提出一种改进的ART2神经网络文本聚类算法,通过LSA凸显文本和词条之间的语义关系,减少无用噪声,降低数据维度和计算复杂性;采用改进的折中学习方法,减少计算步骤,加快ART2神经网络计算速度,并利用最近邻动态重组方法提高ART2网络聚类的稳定性,减弱算法对样本输入顺序的依赖。实验表明,改进的文本聚类算法能有效地实现动态文本聚类。
In order to realize dynamic clustering for high-dimensional text data, an improved ART2 neural network text clus-tering algorithm based on Latent Semantic Analysis(LSA)is proposed, which emerges the semantic relations between texts and terms and reduces the noises, the dimensionality and the computation complexity by LSA. The new algorithm uses an improved intermediate learning method to simplify calculating procedures and accelerate the computation of the ART2 net-work, and uses the nearest neighbor reformation to improve the stability and weaken the dependence of samples order for the ART2 network clustering. Experiments demonstrate that this improved algorithm can realize dynamic text clustering effectively.

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随着信息技术的飞速发展，互联网中的网页急剧增长，在这海量、繁杂的网页中却呈现出一定比例的重复网页及近似网页。为了减少农业领域中近似及重复网页对农业垂直搜索引擎性能的影响，文中首先使用MD5算法去除网页集合中完全相同的网页，再利用向量空间模型(VSM)、基于知网的语义相似度模型及潜在语义分析(LSA)三种相似度判断方法对其余网页的相似度进行计算。实验结果显示，当相似度阈值r=60%、维数K=250时，潜在语义分析( LSA)的综合评价F1测度最高，且准确率达到了90.5%。
With the rapid development of information technology,the Internet Web pages are growing sharply. In this massive,complex pages,preach a certain percentage of duplicate pages and similar pages. In order to reduce the influence of agricultural field approximation and repeated Web pages on agricultural vertical search engine performance,first use the MD5 algorithm to remove the same Web pages in the Web page set,then through three kinds of methods which include the Vector Space Model ( VSM) ,semantic similarity model based on HowNet and Latent Semantic Analysis ( LSA) ,calculate the similarity of the rest Web pages. The experimental results show that when the similarity threshold is 60% (r=60%),the dimension is 250 (K=250),the F1 comprehensive evaluation measure of LSA is highest, and the accuracy rate has reached 90. 5%.

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OSPF广泛地被应用在各种网络环境中，稳定性高、维护方便，但对设备的系统开销较大。描述通过划分OSPF区域、路由汇总、更改网络类型和参考带宽等相关技术来减少LSA的泛洪，进一步优化路由表，从而构建一个更加稳定可靠的园区网络。
OSPF is widely used in various network environments, it has the characteristics of high stability, convenient maintenance, but the larger overhead for relative system. Describes about that dividing OSPF Area, route summarization, changing network type and reference band-width technology to reduce LSA flooding, further optimizes the routing table, so as to establish more stable and reliable campus network.

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以Last.fm音乐网站上的用户标签为特征进行歌曲相似性计算研究,提出了一种基于Web标签挖掘的歌曲相似计算方法。从音乐网站Last.fm上抽取了用户标签作为音乐语义特征,通过潜在语义分析（latent semantic a-nalysis,LSA）方法对歌曲语义向量进行降维,并利用改进的K-means算法,根据音乐歌曲间的相似度对歌曲分类,完成了歌曲相似性计算。实验结果表明本文提出的基于LSA音乐语义标签模型的相似计算能取得较好的效果。
A method was proposed for music classification using web tags on web mining,and the user tags made from Last.fm were used as features to study the music similarity.The web tags extracted from Last.fm were the music semantic feature.The Latent Semantic Analysis（LSA） was used for dimension reduction,and finally,according to the similarity between music,clustering results were obtained by the improved K-means.The experimental results show that the proposed method in this paper can get a better result in music classification.

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本文介绍了ASON网络的要求及GMPLS所扩展的OSPF的特点,设计实现ASON网络的路由模块（RC）。能够从LRM接收链路状态及本地拓扑信息,从而更新本地的路由数据库（RDB）,并通过LSA向网络中的其他节点发布信息,同步各节点的RDB。
This paper introduces the ASON network requirements and GMPLS have extended OSPF characteristics, design and implementation of ASON network routing module (RC). Can from LRM receiving link state and local topology information, so as to update the local routing database (RDB), and through the LSA to the rest of the network node release information, synchronization of each node RDB

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首先针对VOBC 仿真系统的需求特点设计系统，将整个系统分成不同Agent，并用MAS体系结构组织系统。然后，分别介绍每个Agent的设计要点，并以PCA为例，用形式化方法进行建模。之后，以VMA和LSA之间为例，简要介绍用KQML语言的通信方法。最后，使用高级语言C＃来实现系统设计。
First, this paper introduced the design of the system for the characteristics of simulation system of VOBC, which is divided into different agents and organized by MAS architecture .Then the key points of de-sign of different agents were introduced .As a case study of PCA , a formal method was used to modeling .After that, a communication method of KQML language in the case of communication between VMA and LSA was in-troduced.At last, the system was designed using C#.

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目的：探讨脊柱-骨盆曲线和谐角（curve harmony angle, CHA）在量化矢状面相邻弯曲间相关性的作用，并评估其用于评价脊柱畸形矢状面平衡的可行性。方法收集93名正常志愿者及95例脊柱畸形患者（包括退变性脊柱侧凸、特发性脊柱侧凸及强直性脊柱炎）的影像学资料，测量常见脊柱-骨盆矢状面局部参数和整体参数，并对其进行相关分析。测量脊柱-骨盆曲线和谐角，包括颈胸和谐角（cervical-thoracic angle，CTA）、胸腰和谐角（thoracic-lumbar angle，TLA）和腰骶和谐角（lumbar-sacral angle，LSA），比较正常人及不同畸形患者间CHA的特征性改变。根据Schwab-SRS成人脊柱畸形分型矢状面参数进行分组，比较不同矢状面平衡状态下CHA的改变，以检验CHA评价脊柱畸形矢状面平衡的可行性。结果正常志愿者与各类型脊柱畸形患者常用脊柱骨盆参数呈现典型改变。CHA在不同类型的脊柱畸形中呈特征性改变。与正常组比较，退变性脊柱侧凸组与强直性脊柱炎组均表现CTA与LSA减小、TLA增大，且强直性脊柱炎组变化程度更为显著；特发性侧凸组仅TLA减小，而CTA及LSA与正常组的差异无统计学意义。矢状面代偿平衡组较平衡组有较小的LSA，失衡组较平衡组有较小的CTA与LSA和较大的TLA，CHA能反映各代偿阶段的特征性改变。结论 CHA可用于量化描述矢状面相邻弯曲间的关系。正常人、各类型脊柱畸形、以及不同平衡状态下CHA表现出不同的特点，其用于临床矢状面平衡及畸形矫正效果的评估具有可行性。
Objective To introduce Curve Harmony Angle (CHA)to quantify the relationship between adjacent curves of the spine and pelvis and evaluate sagittal balance in spinal deformities. Methods Radiographic analysis of 93 asymptomatic vol-unteers and 95 patients including Degenerative Scoliosis(DS), Adolescent Idiopathic Scoliosis(AIS)and Ankylosing Spondylitis (AS)was performed by measuring sagittal parameters. Correlation study among parameters was further conducted. Curve Harmony Angles(CHAs)including the following three parameters were measured. Cervical-Thoracic Angle (CTA), Thoracic-Lumbar Angle (TLA) and Lumbar-Sacral Angle (LSA). Comparative study between normal population and different spinal disorders were per-formed in order to describe the characteristic changes of CHAs. Besides, according to Schwab SRS adult deformity classification, comparative study of CHAs in different balance status was performed to test the reliability of CHA on sagittal balance evaluation. Results All subjec

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