Hallux valgus is a relatively common and multifaceted complex deformity of the front part of the foot. It is the result of multiple effects of innate (endogenous) and exogenous etiological factors with different degre...Hallux valgus is a relatively common and multifaceted complex deformity of the front part of the foot. It is the result of multiple effects of innate (endogenous) and exogenous etiological factors with different degrees of influence. The degree of hallux valgus deformity is usually assessed by radiological values of hallux valgus (HV) and intermetatarsal (IM) angles. The aim of the paper is to justify the definition of hallux valgus deformity as a function of one angle, (HVA or IMA), and then to determine the functional connection and the most suitable function equalizing the values of the angles IMA and HVA. As hallux valgus is a double angulation deformity, the analytically determined connection between the HVA and IMA angles reduces the study of the deformity to the study of function with one argument, and makes the analysis of deformity changes before and after operative treatment simpler. For the determined connections between the angles, the values of linear proportionality coefficients and regression coefficients of corresponding linear functions of analytical equalization of the value of the IM angle and the degree of deformity for a given value of the HV angle were experimentally determined. The obtained results were checked on a sample of 396 operatively treated hallux valgus deformities. The presented analytical approach and the obtained functional links of IMA and HVA enable quantitative observation of the change in the degree of deformity based on the radiologically determined value of these angles, and the established nonlinear function will be useful for evaluating the expected value of the IM angle and the degree of deformity based only on the measured value of the HV angle. .展开更多
This paper presents an efficient method of equivalient workstations for modeling and analysis of multistage transfer lines with unreliable machines and finites buffers. The deterministic processing times for discrete ...This paper presents an efficient method of equivalient workstations for modeling and analysis of multistage transfer lines with unreliable machines and finites buffers. The deterministic processing times for discrete parts and random failuse and repair times for machines are assumed. These buffers lead to blockage and starvation in operation due to limited storage capacities and make the problem of modelling and analysis very difficult to treat because they have large state spaces and cannot be decomposed exactly. A single buffer between two reliable workstations is analysed first. Then an equivalent workstation without starvation and blockage is constructed. Thereafter connecting all the equivalent workstations in series we get the equivalent transfer line. A set of preformance measures such as the production rates, efficiencies and average inventory levels are derived in explicit analytical expressions. Finally two numerical examples are given for comparing these calculated results with those of S. B. Gershwin (1987) and C. R. Glasseye & Y. Hong (1993) and illustrating the application of the method in engineering design directly.展开更多
目前,会话初始化协议(Session Initiation Protocol,SIP)被广泛应用于各种音视频业务系统中,由于SIP体制具有易集成、成本低廉、使用方法灵活等特点,再加上信息通信技术(Information Communication Technology,ICT)融合的趋势越来越明显...目前,会话初始化协议(Session Initiation Protocol,SIP)被广泛应用于各种音视频业务系统中,由于SIP体制具有易集成、成本低廉、使用方法灵活等特点,再加上信息通信技术(Information Communication Technology,ICT)融合的趋势越来越明显,已在移动、电信运营商的4G、5G移动通信中得到广泛应用,目前也正在向以战场通信网为代表的其他特殊领域进行应用。但是在战场通信网中,接入机制具有泛在性和随遇性,位置管理机制需要具有容灾性和抗毁性,这为SIP体制的应用带来了巨大的挑战,迫切需要对SIP业务控制方法专门进行适应性研究和设计,以满足战场通信网的应用需求。通过深入分析SIP体制的接入机制、位置管理机制以及呼叫寻址机制,提出两种SIP业务控制增强方法,并给出了各自适合的应用场景,最后进行了试验验证,证明了两种方案各自的优势,为SIP体制应用于战场通信网提供了理论支撑。展开更多
水下爆炸当量和深度估计是全面禁止核试验条约(CTBT)国际监测系统(IMS)水声监测的一项重要任务。为有效估计海域内爆炸事件的当量和深度,在使用气泡脉动周期半经验公式的基础上,综合利用水下爆炸气泡脉动第一次、第二次周期比值与气泡...水下爆炸当量和深度估计是全面禁止核试验条约(CTBT)国际监测系统(IMS)水声监测的一项重要任务。为有效估计海域内爆炸事件的当量和深度,在使用气泡脉动周期半经验公式的基础上,综合利用水下爆炸气泡脉动第一次、第二次周期比值与气泡半径、深度的关系信息,估计了近、远场的水下爆炸当量和深度,对不同当量、爆炸深度的近场水下爆炸分析结果为:100 g TNT、7 m爆炸深度条件下,估计当量均值约118 g、估计深度均值约7.96 m;100 g TNT、25 m爆炸深度条件下,估计当量均值约76 g,估计深度均值约21.4 m;1 kg TNT、50 m爆炸深度条件下,估计当量均值约1.23 kg、估计深度均值约44 m。上述分析结果表明:采用的联合估计方法对深度的估计要比对当量的估计更为准确。进一步分析可知:对于50 m爆炸深度、100 g TNT小当量的爆炸信号来说,该方法未能给出估计结果,这表明该方法估计水下爆炸当量是在爆炸深度上受限的。最后对IMS水声台站记录的远场水下爆炸事件进行了分析,其当量、深度估计结果与参考文献一致,这说明该方法同样适应于对远场爆炸信号的估计。展开更多
文摘Hallux valgus is a relatively common and multifaceted complex deformity of the front part of the foot. It is the result of multiple effects of innate (endogenous) and exogenous etiological factors with different degrees of influence. The degree of hallux valgus deformity is usually assessed by radiological values of hallux valgus (HV) and intermetatarsal (IM) angles. The aim of the paper is to justify the definition of hallux valgus deformity as a function of one angle, (HVA or IMA), and then to determine the functional connection and the most suitable function equalizing the values of the angles IMA and HVA. As hallux valgus is a double angulation deformity, the analytically determined connection between the HVA and IMA angles reduces the study of the deformity to the study of function with one argument, and makes the analysis of deformity changes before and after operative treatment simpler. For the determined connections between the angles, the values of linear proportionality coefficients and regression coefficients of corresponding linear functions of analytical equalization of the value of the IM angle and the degree of deformity for a given value of the HV angle were experimentally determined. The obtained results were checked on a sample of 396 operatively treated hallux valgus deformities. The presented analytical approach and the obtained functional links of IMA and HVA enable quantitative observation of the change in the degree of deformity based on the radiologically determined value of these angles, and the established nonlinear function will be useful for evaluating the expected value of the IM angle and the degree of deformity based only on the measured value of the HV angle. .
文摘This paper presents an efficient method of equivalient workstations for modeling and analysis of multistage transfer lines with unreliable machines and finites buffers. The deterministic processing times for discrete parts and random failuse and repair times for machines are assumed. These buffers lead to blockage and starvation in operation due to limited storage capacities and make the problem of modelling and analysis very difficult to treat because they have large state spaces and cannot be decomposed exactly. A single buffer between two reliable workstations is analysed first. Then an equivalent workstation without starvation and blockage is constructed. Thereafter connecting all the equivalent workstations in series we get the equivalent transfer line. A set of preformance measures such as the production rates, efficiencies and average inventory levels are derived in explicit analytical expressions. Finally two numerical examples are given for comparing these calculated results with those of S. B. Gershwin (1987) and C. R. Glasseye & Y. Hong (1993) and illustrating the application of the method in engineering design directly.
文摘目前,会话初始化协议(Session Initiation Protocol,SIP)被广泛应用于各种音视频业务系统中,由于SIP体制具有易集成、成本低廉、使用方法灵活等特点,再加上信息通信技术(Information Communication Technology,ICT)融合的趋势越来越明显,已在移动、电信运营商的4G、5G移动通信中得到广泛应用,目前也正在向以战场通信网为代表的其他特殊领域进行应用。但是在战场通信网中,接入机制具有泛在性和随遇性,位置管理机制需要具有容灾性和抗毁性,这为SIP体制的应用带来了巨大的挑战,迫切需要对SIP业务控制方法专门进行适应性研究和设计,以满足战场通信网的应用需求。通过深入分析SIP体制的接入机制、位置管理机制以及呼叫寻址机制,提出两种SIP业务控制增强方法,并给出了各自适合的应用场景,最后进行了试验验证,证明了两种方案各自的优势,为SIP体制应用于战场通信网提供了理论支撑。
文摘水下爆炸当量和深度估计是全面禁止核试验条约(CTBT)国际监测系统(IMS)水声监测的一项重要任务。为有效估计海域内爆炸事件的当量和深度,在使用气泡脉动周期半经验公式的基础上,综合利用水下爆炸气泡脉动第一次、第二次周期比值与气泡半径、深度的关系信息,估计了近、远场的水下爆炸当量和深度,对不同当量、爆炸深度的近场水下爆炸分析结果为:100 g TNT、7 m爆炸深度条件下,估计当量均值约118 g、估计深度均值约7.96 m;100 g TNT、25 m爆炸深度条件下,估计当量均值约76 g,估计深度均值约21.4 m;1 kg TNT、50 m爆炸深度条件下,估计当量均值约1.23 kg、估计深度均值约44 m。上述分析结果表明:采用的联合估计方法对深度的估计要比对当量的估计更为准确。进一步分析可知:对于50 m爆炸深度、100 g TNT小当量的爆炸信号来说,该方法未能给出估计结果,这表明该方法估计水下爆炸当量是在爆炸深度上受限的。最后对IMS水声台站记录的远场水下爆炸事件进行了分析,其当量、深度估计结果与参考文献一致,这说明该方法同样适应于对远场爆炸信号的估计。
