改进的L1范数故障诊断方法

本文提出一种线性模拟容差电路故障诊断方法——改进的L_1范数方法。此方法首先运用蒙特卡诺容差分析方法,建立线性模拟容差电路模型,然后通过求解L_1范数优化诊断方程,以诊断故障元件,并在优化求解过程中作了线性化处理。     

Improved adaptive group testing algorithms with applications to multiple access channels and dead sensor diagnosis

We study group-testing algorithms for resolving broadcast conflicts on a multiple access channel (MAC) and for identifying the dead sensors in a mobile ad hoc wireless network. In group-testing algorithms, we are asked to identify all the defective items in a set of items when we can test arbitrary subsets of items. In the standard group-testing problem, the result of a test is binary—the tested subset either contains defective items or not. In the more generalized versions we study in this paper, the result of each test is non-binary. For example, it may indicate whether the number of defective items contained in the tested subset is zero, one, or at least two. We give adaptive algorithms that are provably more efficient than previous group testing algorithms. We also show how our algorithms can be applied to solve conflict resolution on a MAC and dead sensor diagnosis. Dead sensor diagnosis poses an interesting challenge compared to MAC resolution, because dead sensors are not locally detectable, nor are they themselves active participants. A preliminary version of this paper was presented at SPAA 2006.     

A Knowledge Based System for Assisting in Differential Diagnosis of Chemically Dependent/Mentally Ill Patients

Summary

This paper discusses the use of Knowledge Base 2.1, a computer program that administers a response dependent, structured interview to evaluate the presence of psychiatric disorders within the chemical dependency treatment setting. The writer reviews the problems commonly encountered when conducting clinical interviews, psychometric examinations and differentially diagnosing psychiatric disorders within this special population. Knowledge Base 2.1 utilizes combined computer techniques of rule driven logic, pattern matching, and an original algorithm that accomplishes a “real time retandardization” of the complete database. With each administration, standardization is implemented in an effort to adequately consider the effects of chemical dependency on psychological test performance and normative information regarding symptoms. Knowledge Base 2.1 also functions as a research tool inasmuch as all patient responses to this structured interview are permanently stored in computer files for ongoing analysis.     

Three Squares a Day

In contrast to previous research on the Civilian Conservation Corps (1933-1942), which has focused on policy developments in Washington, the present study looks at young men in the CCC camps across the country. Incorporating a variety of data sources and applying social science methodology to historical data, the study finds that two camp variables, food and living conditions, were the variables most associated with enrollee satisfaction in the CCC. An "emergent" variable in the study, employment opportunities, also played an important role; enrollees tended to leave the CCC when other jobs were available. Taken together, the two camp variables and the employment variable combine into a theme of basic needs-food, shelter, and jobs. A common phrase during the 1930s, "three squares a day," perhaps best captures this group of variables. Two geographical variables, urban vs. rural background and distance from home, also influenced enrollee satisfaction. Urban enrollees and enrollees a great distance from home responded less positively. Two enrollee demographic variables, age and race, were not significantly associated with enrollee response. Possible implications of the CCC experience for modern youth employment programs seem to be: (I) address fundamental needs of young people which, in the 1980s, may be education and employment: (2) keep programs close to home, urban or rural; and (3) do not overemphasize individual characteristics; program design is probably more important.     

月经失调的检查与治疗

月经是女性生殖功能成熟的标志之一,也是妇女健康状况的重要标志之一。月经失调既可以是下丘脑──垂体──卵巢轴功能障碍的表现,也可以是全身功能状态异常的反映。诊断时应详细了解病史,结合B超、诊断性刮宫等检查方法。青春期功血以调整月经周期和促进排卵为主;更年期功血以调整月经周期和手术治疗为主。     

大学英语阅读障碍诊断及治疗之探讨

由于阅读过程内在的复杂性,阅读是较难掌握的一项语言技能。本文从阅读障碍的诊断和治疗两方面对中国大学英语阅读教学进行探讨,抛砖引玉,以期有更多的同仁加入这一话题的讨论。     

1992年以来我国缔约过失责任研究述评

自1992年以来,我国学术界围绕着缔约过失责任的内涵、法律性质、类型、赔偿范围和立法等问题进行了研究。研究取得了很大进展,但在深度和广度上都还有待拓展。     

个体行为因素的模糊层次分析

通过构建定性和定量相结合的个体行为因素模糊层次分析模型,探讨个体行为因素对个人绩效的影响主、次问题。先基于人的认知模式建立个体行为层次诊断模型,采用回溯性分析方法来确定个体行为的原因因素或原因组合,再结合模糊层次分析法探讨影响个体行为的主要关联因素并对其进行排序,量化各具体致因因素的权重及其重要性,该方法为改进个体在系统中的绩效提供理论依据,从而为以人为本的工作设计、管理提供有效的决策支持。     

A critique of arguments supporting disability avoidance

Many prominent bioethicists argue that positive consequences follow from avoiding disability in offspring by preconceptual, preimplantation or prenatal means. This paper critiques two variants of these positions: ‘Open future’ arguments that avoiding disability is in the interest of the persons who will be affected by it if born and ‘non‐person‐affecting’ claims that failures to avoid disability in offspring are wrong for reasons independent of their effect on affected offspring. Difficulties with both person‐affecting and non‐person‐affecting accounts are discussed in support of the charge that these arguments do not show that positive consequences follow from disability avoidance.     

转子不对中故障的振动特性和试验

本文从动力学角度研究具有凸缘联轴节的转子不对中故障的机理。列出轴振动的运动微分方程。得到的方程是参数激励和强迫激励联合作用。应用非线性振动的理论,用傅里叶展开求得其稳态响应,得到不同于以往中外有关文献的结果。本文在文[1]的基础上,作了充实和修改,做了转子不对中的人为故障试验。试验结果与理论分析基本相符。