TURBO AIDED CYCLIC PREFIX RECONSTRUCTION FOR CODED SINGLE-CARRIER SYSTEMS WITH FREQUENCY-DOMAIN EQUALIZATION (SC-FDE)

In this paper, a Turbo aided Cyclic Prefix (CP) reconstruction scheme, termed Turbo- CPR, is proposed for Single-Carrier systems with Frequency-Domain Equalization (SC-FDE) that employ insufficient CP in the transmitter. In Turbo-CPR, the decoder output is incorporated in the process of equalization, i.e. Turbo equalizer is employed. It is shown in the simulation results that Turbo-CPR not only recovers the performance loss due to insufficiency of CP, but also provides extra gains over the lower bound of performance for conventional CP reconstruction schemes.

Analysis of the Integral Efficiency Indicator for Information Systems of the Cyclic Type Accounting for Weights

The article is dedicated to the task of developing efficient means to analyze functioning of an information system of the cyclic type based on determining the integral performance criterion. We consider the subject area related to the analysis of moments of peak loads in teaching (admissions, conducting tests and examinations, accreditation of a university, etc.). The criterion is developed based on the analysis of all the processes occurring in the information system (IS) of a university and based on the selection of main factors affecting the change in the effective functioning of the university departments. Certain qualitative and quantitative parameters affecting the integral index of efficiency are considered at various times, since functioning of the whole system is cyclical. A weight for each criterion is accounted for in the integral indicator of efficiency. The proposed approach will allow for simplification of the research of efficiency characteristics of the information systems of the cyclic type based on the analysis of the integral coefficient.

Stability Analysis for the Cellular Signaling Systems Composed of Two Phosphorylation-Dephosphorylation Cyclic Reactions

The regulatory mechanisms in cellular signaling systems have been studied intensively from the viewpoint that the malfunction of the regulation is thought to be one of the substantial causes of cancer formation. On the other hand, it is rather difficult to develop the theoretical framework for investigation of the regulatory mechanisms due to their complexity and nonlinearity. In this study, more general approach is proposed for elucidation of characteristics of the stability in cellular signaling systems by construction of mathematical models for a class of cellular signaling systems and stability analysis of the models over variation of the network architectures and the parameter values. The model system is formulated as regulatory network in which every node represents a phosphorylation-dephosphorylation cyclic reaction for respective constituent enzyme. The analysis is performed for all variations of the regulatory networks comprised of two nodes with multiple feedback regulation loops. It is revealed from the analysis that the regulatory networks become mono-stable, bi-stable, tri-stable, or oscillatory and that the negative mutual feedback or positive mutual feedback is favorable for multi-stability, which is augmented by a negatively regulated node with a positive auto-regulation. Furthermore, the multi-stability or the oscillation is more likely to emerge in the case of low value of the Michaelis constant than in the case of high value, implying that the condition of higher saturation levels induces stronger nonlinearity in the networks. The analysis for the parameter regions yielding the multi-stability and the oscillation clarified that the stronger regulation shifts the systems toward multi-stability.

Effects of Meglumine Cyclic Adenylate Pretreatment on Systemic inflammatory Response Syndrome Induced by Lipopolysaccharide in Rats

Studies showed that the use of cyclic adenosine monophosphate(cAMP) substitutes or intracellular c AMP activators increased intracellular cAMP level, causing anti-inflammatory effects. This study was to investigate the effects of pretreatment with meglumine cyclic adenylate(MCA), a compound of meglumine and cAMP, on systemic inflammation induced by lipopolysaccharide(LPS) in rats. Eighteen adult male Sprague-Dawley rats were randomly divided into 3 groups(n=6 each): control group(NS group), LPS group(LPS group) and LPS with MCA pretreatment group(MCA group). Systemic inflammation was induced with LPS 10 mg/kg injected via the femoral vein in LPS and MCA groups. In MCA group, MCA 2 mg/kg was injected via the femoral vein 20 min before LPS injection, and the equal volume of normal saline was given in NS and LPS groups at the same time. Three hours after LPS injection, the blood samples were taken from the abdominal aorta for determination of plasma concentrations of TNF-α, IL-1, IL-6, IL-10, cAMP by ELISA and NF-κBp65 expression by Western blotting. The experimental results showed that inflammatory and antiinflammatory indices were increased in LPS group compared to NS group; inflammatory indices were declined and anti-inflammatory indices were increased in MCA group relative to LPS group. Our study suggested that MCA pretreatment may attenuate LPS-induced systemic inflammation.

The Formation Control of Multi-agent Systems on a Circle

This paper investigates the formation control of a class of multi-agent systems moving on a circle, whose topology is a cyclic graph, and presents several new results for the following two cases: Case I, the agents with single-integrator kinematics,and Case II, the agents with double-integrator kinematics. Firstly,for Case I, two control protocols are proposed under which the multiagent systems keep a uniformly-spaced formation. Secondly,we study Case II, and a control protocol is designed for this case, then the stability of the formation is proved. Finally, three simulations are studied by using our presented results. The study of illustrative examples with simulations shows that our results as well as designed control protocols work very well in studying the formation control of this class of multi-agent systems.

Methods of reduction for Lagrange systems on time scales with nabla derivatives

The Routh and Whittaker methods of reduction for Lagrange system on time scales with nabla derivatives are studied.The equations of motion for Lagrange system on time scales are established, and their cyclic integrals and generalized energy integrals are given. The Routh functions and Whittaker functions of Lagrange system are constructed, and the order of differential equations of motion for the system are reduced by using the cyclic integrals or the generalized energy integrals with nabla derivatives. The results show that the reduced Routh equations and Whittaker equations hold the form of Lagrnage equations with nabla derivatives. Finally, two examples are given to illustrate the application of the results.

Routh method of reduction for Birkhoffian systems in the event space

For a Birkhoffian system in the event space, this paper presents the Routh method of reduction. The parametric equations of the Birkhoffian system in the event space are established, and the definition of cyclic coordinates for the system is given and the corresponding cyclic integral is obtained. Through the cyclic integral, the order of the system can be reduced. The Routh functions for the Birkhoffian system in the event space are constructed, and the Routh method of reduction is successfully generalized to the Birkhoffian system in the event space. The results show that if the system has a cyclic integral, then the parametric equations of the system can be reduced at least by two degrees and the form of the equations holds. An example is given to illustrate the application of the results.

ON OPTIMAL BACKWARD PERTURBATION ANALYSIS FOR THE LINEAR SYSTEM WITH BLOCK CYCLIC COEFFICIENT MATRIX

Based on the block style spectral decomposition,this paper deals with the optimal backward perturbation analysis for the linear system with block cyclic coefficient matrix.

Study on the Treatment of Dyes Wastewater by Cyclic Activated Sludge System

In this article, Cyclic Activated Sludge System (CASS) used to treat some kinds of dyes wastewater has been described thoroughly, and the effect of dyes wastewater after being treated has also been studied. The results show that the removal efficiencies of CODcr, BOD5, NH3 - N and chromaticity can respectively reach 87 % to 94 % , 94% to 98%, 91% to 94% and 91% to 93% depending on the control parameters of operation. All the water quality parameter of effluent meets the Government Drainage Standard.

CONTROLLABILITY OF A CLASS OF HYBRID DYNAMIC SYSTEMS (Ⅰ)—BASIC PROPERTIES AND PRELIMINARY RESULTS

The controllability for switched linear system with time_delay in controls was first investigated. The whole work contains three parts. This is the first part, including problem formulation and some preliminaries. Firstly, the mathematical model of switched linear systems with time_delay in control functions was presented. Secondly, the concept of column space, cyclic invariant subspace and generalized cyclic invariant subspace were introduced. And some basic properties, such as separation lemma, were presented. Finally, a basic lemma was given to reveal the relation between the solution set of a centain integral equations and the generalized cyclic invariant subspace. This lemma will play an important role in the determination of controllability. All these definitions and lemmas are necessary research tools for controllability analysis.

Efficient Early Termination Strategy for LDPC Codes in GPS Systems

By exploiting the structural features of L1C messages,a novel Early Termination( ET) strategy is proposed to speed up the decoding of low-density parity-check( LDPC) codes in the GPS system. The proposed strategy is based on the cyclic redundancy check( CRC) of the messages in the subframes 2 and 3. The simulation results show that average number of iterations of the proposed strategy is less than that of the standard ET strategy,with nearly no degradation in decoding performance. Besides,the proposed ET strategy can be efficiently implemented in a sequential or parallel manner. Thus,the proposed ET strategy is attractive for practical purposes.

CRC校验码软件生成技术原理分析

循环冗余校验(Cyclic Redundancy Check,CRC)具有检错能力强,运算简单,易于直接用硬件数字电路实现的特点。在完善CRC校验码生成原理模型的基础上,研究了信息系统传输带CRC校验码数据包的一般过程,提出了三种计算数据包CRC校验码的技术方法,在ADI公司DSP软件集成开发仿真测试环境中,设计了一组嵌入式程序,生成了符合ITU组织CRC16 ITU-T V.41标准的CRC校验码码表,分析并总结了CRC校验码码表元素的工程含义和应用方法,研究了两种计算数据包CRC校验码工程实现方法的技术特点,并验证了它们的正确性、一致性和有效性。

Distributed Relay Diversity Systems for OFDM-Based Networks

In this paper, distributed relay diversity systems are analyzed, modeled and evaluated in an Orthogonal Frequency Division Multiplexing (OFDM) based networks. The investigated distributed relay diversity schemes extend the ideas of a single hop transmit antenna schemes such as Cyclic Delay Diversity (CDD), Space Time Transmit Diversity (STTD), transmit Coherent Combining (CC) and Selection Diversity (SD) to distributed diversity systems. In contrast to the classical single hop system, the antennas in the distributed systems belongs to distributed relays instead of being co-located at the transmitter. The distributed relay diversity methods considered in this paper: Relay CDD (RCDD), Relay Alamouti (i.e.STTD), Relay CC (RCC) and Relay SD (RSD) are compared to the traditional 1-hop system. Analytical expressions for the received Signal to Interference Noise Ratio (SINR) are derived and used in a dynamic multi-cell multi-user simulator. Results show considerable SINR gains for both Round Robin and Max-SINR schedulers. The SINR gains translate into substantial cell throughput gains, up to 200%, compared to 1-hop systems. Despite its low complexity, the RCDD scheme has similar performance to that of other more sophisticated 2-hop schemes such as Relay Alamouti and Relay Coherent Combining. Marginally better results are observed for the Relay Selection Diversity scheme.

RESEARCH ON A REAL-TIME CONTROL SYSTEM OF LOW POWER DISSIPATION FOR CONTINUOUS CYCLIC PERITONEAL DIALYSIS(CCPD) CYCLER

A low power dissipation control system for continuous cyclic peritoneal dialysis (CCPD) cycler and its characteristics are reported. Combined withhemodialysis and renal transplantation, peritoneal dialysis is used mainly for thetreatment of renal failure. CCPD has been developed during 1980＇s. It provided automatic dialysis procedures during the night to avoid interruptions in patients＇dailyroutine. Furthermore,there is a remarkable decrease in peritonitis occurance usingCCPD. The control system is a critical part for CCPD cycler. The system is approvedto be reliable and flexible in practical experiments. When AC power failure,the system can still ensure the completion of dialysis.

Surfactin的结构、生物合成及其在生物防治中的作用

Surfactin是由多种芽孢杆菌产生的一种脂肽,其由一个环七肽头基通过内脂键与链长12-17个碳原子的β-羟基脂肪酸连接组成,是一种非常有效的生物表面活性剂,并具有重要的生物学功能。本文介绍了surfactin家族的结构和生物合成模式,surfactin是由非核糖体肽合成酶催化合成,这种机制赋予了surfactin家族成员的结构多样性;综述了surfactin在植物病害生防中的作用及机制。已有的研究表明surfactin在生物防治中的作用机制主要有以下4种方式:(1)损伤病原菌细胞膜,引起细胞膜裂解或渗透压失衡;(2)抑制病原体繁殖;(3)诱导植株系统抗性;(4)促进生防菌株的定殖或生物膜的形成。进一步总结了利用基因工程技术研究surfactin的最新进展,以指导surfactin的生物合成及其新衍生物开发。Surfactin的高度结构多样性,使其具有丰富的物理化学特性,这些特性可以与多种生物活性联系在一起,将在不同的领域有更广泛应用。随着对surfactin生物合成研究的日益深入,将会有更多高性能和广阔应用前景的新型脂肽被研发,这为surfactin的进一步研究和生防应用提供依据。

全身免疫炎症指数对类风湿关节炎的诊断价值

目的探讨全身免疫炎症指数(SII)对类风湿关节炎(RA)的诊断价值。方法选取2021年1月至2022年12月该院收治的50例RA患者作为观察组,另选取同期该院50例健康体检者作为对照组。采用免疫比浊法检测两组血清类风湿因子(RF)、抗环瓜氨酸肽(CCP)抗体水平。收集白细胞计数(WBC)、中性粒细胞计数(N)、血小板计数(PLT)、淋巴细胞计数(L)、平均血小板体积(MPV)水平,计算SII(PLT×N/L)、PLR(PLT/L)、NLR(N/L)、PNR(PLT/N)和PWR(PLT/WBC)。比较两组各项指标的差异。采用Pearson相关分析血细胞相关指标与RF、抗CCP抗体的相关性。采用受试者工作特征(ROC)曲线分析SII对RA的诊断价值。结果观察组血清RF、抗CCP抗体水平及PLR、SII、NLR均高于对照组,L低于对照组,差异均有统计学意义(P<0.05);两组WBC、N、PLT、MPV、PNR及PWR比较,差异均无统计学意义(P>0.05)。SII与血清RF、抗CCP抗体水平均呈正相关(r=0.441、0.384,P<0.05),但相关性均较弱。ROC曲线分析结果显示,SII诊断RA的最佳截断值为0.26,曲线下面积为0.622,灵敏度为64.0%,特异度为62.0%。结论RA患者SII高于健康者,并且与RF、抗CCP抗体水平均呈正相关,动态监测其变化可为RA临床治疗方案的制订提供参考依据。

完善生鲜农产品供应链的理论和政策研究

我国轻商的观念由来已久,但城乡居民日常需要的生鲜食品高度依赖从事生鲜农产品经营的商贩,他们是生鲜农产品供应链主体的组成部分,在促进生鲜农产品区域分工深化、贴近民生方面发挥着重要作用,对产业集群、供应链冷链、物流园区、旅游、住宿、餐饮就业都具有强烈多向性的带动作用,是各地经济发展的隐形间接影响力、软实力。必须改变长期存在的重场所建设、轻主体培育的顽疾;培育生鲜农产品供应链的链主企业,促进供应链分工的深化和专业化;加强对违法违规行为的监管,共促诚实守信公平竞争的营商环境;对生鲜农产品市场实施反周期调控;严格大棚与大田生鲜农产品的行为监管标准;将市场调控的重心从事后的被动跟进管理,转变为事前的主动引导服务;探索“有效市场+有为政府”的管理模式,创新逆周期监测调控的有效办法;把握生鲜农产品供应链高质量发展的舆论导向,为商人正名;警惕出现重生产、轻流通新的倾向和新的表现形式,防止损害现代流通体系、统一大市场建设。

LDACS系统基于循环谱和残差神经网络的频谱感知方法

针对L波段数字航空通信系统(L-band digital aeronautic communication system,LDACS)可用频谱资源有限且易受大功率测距仪(distance measuring equipment,DME)信号干扰的问题,提出一种基于降维循环谱和残差神经网络的频谱感知方法。首先理论推导分析了DME信号的循环谱特征;然后利用Fisher判别率(Fisher discriminant rate,FDR)提取循环频率能量最大的向量,通过主成分分析(principal component analysis,PCA)进行预处理特征增强;最后给出数据处理后的循环谱向量与卷积神经网络相结合的实现过程,实现了DME信号的有效检测。仿真结果表明,该方法对噪声不敏感,当信噪比不低于-15 dB时,平均检测概率大于90%。当信噪比不低于-14 dB,检测概率接近100%。

循环轮询系统任务阻塞应对策略研究

针对循环轮询系统任务中的延时阻塞和事件阻塞导致的系统死锁、实时性不能保证和用户体验差问题,根据任务周期性和阻塞类型对任务进行分类拆分。拆分后的任务周期性和执行条件与原任务及阻塞特性有关。

基于CP重构的高时间传输效率CP-UFMC接收方法

针对循环前缀(cyclic prefix,CP)不足的情况对循环前缀通用滤波多载波(cyclic prefix-universal filtered multi-carrier,CP-UFMC)系统的影响进行了数学推导,提出了一种基于CP重构的高时间传输效率CP-UFMC接收方法来改善系统性能,并进一步研究了选择性重构方法的性能。之后仿真研究了不同CP长度,不同载波频率偏移和不同正交振幅调制阶数时的系统误符号率(symbol error rate,SER)表现。仿真结果表明,基于CP重构的CP-UFMC接收方法可以改善CP不足导致的系统SER恶化问题,使其接近CP充足时的SER,并优于对比的其他通用滤波多载波系统接收方法。