Self-correcting inspection procedure under inspection errors

In this paper we present a novel treatment of the inspection-system design problem when inspection is unreliable and subject to classification errors. Our approach, based on the theory of Error-Correcting Codes (ECC), leads to the development of a Self-Correcting Inspection (SCI) decision rule that does not require complete knowledge of inspection error probabilities. We show that the proposed rule assures correct classification, if the number of inspection errors is less than a certain number. We analyze the performance of the SCI decision rule under different inspection situations, including some situations that are uncommon in the field of error-correcting codes. Then, we show how the underlying mathematical structure can be applied to determine the number of inspections and the level of inspection reliability in order to minimize the sum of inspection-related costs. The practical contribution of this work lies in that it expands the ability of the designer of inspection systems to deal with cases where there is very little or no information regarding the reliability of the inspection operations.     

波形钢腹板曲线箱梁桥合理跨径研究

等截面、无预应力筋的波形钢腹板曲线连续箱梁桥由于建造较少,其合理的边中跨比例关系尚未研究。本文通过力法对三跨等截面连续波形钢腹板曲线箱梁桥在恒载和活载作用下,不同边中跨比值对中跨与边跨最大弯矩的影响进行参数分析,得到等截面、无预应力筋的波形钢腹板连续箱梁桥的合理边中跨比值,并针对不同梁高的波形钢腹板曲线箱梁给出合理跨径,为今后此类桥型的设计提供参考。     

治所城市与卫所城市的空间特征比较研究* ——基于定海古城的纵向剖析

定海古城经历了从治所城市到卫所城 市、再到治所城市的二度更迭,其特殊性和典型 性对于中国古代治所与卫所城市的对比研究具 有重要价值。复原不同时期的城市空间形态,分 析定海古城作为卫所城市和治所城市在构成要 素和空间特征上的差异,发现治所城市侧重行政 和教化职能,规划布局注重秩序性;卫所城市侧 重军事防御职能,规划布局注重安全性。     

Blood and serum chemistry values of gnotobiotic beagles

Several blood and serum chemistry values were serially determined over a 2-yr period on 17 purebred beagle dogs from the same closed, inbred colony. Seven of these dogs were germfree, and 10 had a conventional bacterial flora. Seven of those with a conventional flora were confined in germfree-type isolators; 3 were housed in a routine manner in a conventional animal facility. The germfree dogs were found to have significantly lower red blood cell, white blood cell, neutrophil, and band cell counts lower levels of alpha-2 and gamma globulins, and higher amounts of cholesterol and alkaline phosphatase than the 2 sets of conventional dogs. In most other respects, the blood and serum chemistry values of the germfree dogs were similar to those of the conventional dogs and to previously reported values for normal beagles.     

Recovery requirements of branch prediction storage structures in the presence of mispredicted-path execution

Execution along mispredicted paths may or may not affect the accuracy of subsequent branch predictions if recovery mechanisms are not provided to undo the erroneous information that is acquired by the branch prediction storage structures. In this paper, we study four elements of the Two-Level Branch Predictor: the Branch Target Buffer (BTB), the Branch History Register (BHR), the Pattern History Tables (PHTs), and the Return Address Stack (RAS). For each we determine whether a recovery mechanism is needed, and, if so, show how to design a cost-effective one. Using five benchmarks from the SPECint92 suite, we show that there is no need to provide recovery mechanisms for the BTB and the PHTs, but that performance is degraded by an average of 30% if recovery mechanisms are not provided for the BHR and RAS.     

The multilocation transshipment problem

We consider a supply chain, which consists of several retailers and one supplier. The retailers, who possibly differ in their cost and demand parameters, may be coordinated through replenishment strategies and transshipments, that is, movement of a product among the locations at the same echelon level. We prove that in order to minimize the expected long-run average cost for this system, an optimal replenishment policy is for each retailer to follow an order-up-to S policy. Furthermore, we demonstrate how the values of the order-up-to quantities can be calculated using a sample-path-based optimization procedure. Given an order-up-to S policy, we show how to determine an optimal transshipment policy, using a linear programming/network flow framework. Such a combined numerical approach allows us to study complex and large systems.     

Online monitoring of steel casting processes using multivariate statistical technologies: From continuous to transitional operations

This paper describes a state-of-the-art online monitoring system using multivariate statistical technologies for continuous steel casting process, which was commissioned at Dofasco’s No. 2 caster to provide consistent indication of process health for caster’s start-up, continuous production and transitional operations. The paper particularly focuses on development of a novel scheme to synchronize process trajectories for monitoring specific transitional operations such as equipment or steel product grade changes. The proposed scheme is demonstrated by several industrial examples with the results showing good detectability of various process abnormalities. With the aid of this fully integrated, innovative monitoring system, Dofasco has generated significant value through improved productivity and reduced maintenance costs.     

古邢台对刘秉忠设置元大都中心台的影响初探

元大都设置“中心台”于都城四方之 中,中心台规划一直以来是城市规划史上的一个 谜题。通过文献解读和空间复原发现,金末元 初邢州城中心有古邢台,处于山川测望线交汇点 上,邢州城的台—城—山空间关系与元大都相 似;元大都规划主持者刘秉忠对邢州有深厚的 故乡情结,对邢州的台、城、山及其空间关系有 充分的认知。推测元大都中心台设置很可能参 考了邢州城的古邢台,实现了古代山川定位技术 方法的传承与发展,相关历史遗存是重要的规 划遗产。