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Fitting RSM to FROC/ROC data and key findings
Published in Dev P. Chakraborty, Observer Performance Methods for Diagnostic Imaging, 2017
The RSM has three parameters μ, λ′, and ν′ (excluding thresholds). CBM has two parameters α and μCBM, detailed in Chapter 20. Both RSM and CBM fitting methods are implemented in . PROPROC has two-parameters c, da, detailed in Chapter 20. The PROPROC parameters were determined by running Windows software20 (Sept. 04, 2014, Build 4) with PROPROC selected as the curve fitting method. The relevant results are saved in files that end with contained in . This directory is part of the RJafroc installation. It, and its contents, becomes visible when the package is installed. The files can be opened by and the values c,da are in the last two columns, see screen-shot Figure 19.3. For example, for the dataset, for modality 2 and reader 1, c = −0.321 and da = 2.35.
Instruments for Data Acquisition
Published in Felix Alberto Farret, Marcelo Godoy Simões, Danilo Iglesias Brandão, Electronic Instrumentation for Distributed Generation and Power Processes, 2017
Felix Alberto Farret, Marcelo Godoy Simões, Danilo Iglesias Brandão
The Universal Serial Bus (USB) is the fastest connector for data transfer (see Figure 9.13), in which any computer has one or more USB gates (connectors). These USB ports allow connecting several external devices, ranging from mice to printers. The operating system also supports USB interface, so the device driver installation is quick and easy. Compared with other ways of device connection (including parallel ports, serial ports, and special cards installed inside the machine cabinet), USB devices are straightforward. USB 3.0 hit the market in 2009, commercially known as USB SuperSpeed (SS). It is characterized mainly by an increase in data transfer speed because it has more connections than in model 2.0, which were 4, while in model 3.0, they reach 9, being able to receive and send data at the same time. Generally, motherboards with USB 2.0 connections can use the benefits of USB 3.0. Table 9.8 is a table comparing the most popular USB cables.
Force-System Resultants and Equilibrium
Published in Richard C. Dorf, The Engineering Handbook, 2018
The final part of the I/O subsystem links the software application with the I/O adapter and interrupt handler. The computer’s operating system must recognize the I/O device; thus, an additional piece of software known as the device driver is installed into the operating system along with the installation of a new device. The driver provides a device name and memory location that the software can address. Instead of burdening a software programmer with knowing the specifics of an I/O device, the driver manages the I/O events and provides some degree of user programmability. The driver deals with resetting and arming interrupts, initializing the DMA controller, starting the I/O adapter, accessing status bits, handling errors, and so on.
Optimal bivariate spare ordering policy for a system with imperfect maintenance
Published in International Journal of Systems Science: Operations & Logistics, 2023
Chin-Chih Chang, Yen-Luan Chen
Wiggins (1967) considered an ordering policy in which a spare unit is ordered at a prespecified time after the installation of the operating system or at the failure of the operating system, whichever occurs first. Sheu and Liou (1993) further considered two ordering policies for a system with age-dependent minimal repair and two types of lead times. Chien (2009) presented a number-dependent spare ordering policy, where a spare unit for replacement is ordered regularly at the occurrence of the th repairable failure, or ordered in emergency at the first unrepairable failure, whichever happens first, and is placed whenever the spare unit becomes available. Chien and Chen (2010) proposed a time-dependent ordering policy for PR, in which a regular order is made at time , and an expedited order is executed at the time of system's failure. Cheng and Li (2012) proposed a two-dimensional ordering and replacement policy , in which the spare unit is ordered at the th repairable failure or at the first unrepairable failure, and the system is replaced by the spare if available at the th repairable failure or at the first unrepairable failure. More spare ordering policies have been proposed and optimised from a variety of perspectives (Sarada & Shenbagam, 2021; Sheu et al., 2013; Zhang et al., 2021).
Global-local plug-in for high-fidelity composite stress analysis in ABAQUS
Published in Mechanics of Advanced Materials and Structures, 2021
Erasmo Carrera, Alberto Garcia de Miguel, Matteo Filippi, Ibrahim Kaleel, Alfonso Pagani, Marco Petrolo, Enrico Zappino
The model is in the software package MUL2@GL via an ABAQUS plug-in, see Figure 3. The script is in Python as supported by the ABAQUS environment and leading to a straightforward passage of information between the FEM and MUL2@GL. The installation of MUL2@GL in ABAQUS is the same as for any other plug-in [16]. A GUI enables a user-friendly experience. From the MUL2@GL window, the critical elements are selected in the current output file on display. After the fast computations of the local 3 D fields, the tool presents the plots of the 3 D strain and stress solutions - all six components - and failure criteria on the screen. It also saves the data in DAT and CSV format for Excel. This process is repeatable as many times as wanted, based on the number of critical elements considered. The availability of such refined solutions may allow structural engineers to calculate the desired failure criteria consistently, using the right strain/stress inputs.
The revised Tennessee Eastman process simulator as testbed for SPC and DoE methods
Published in Quality Engineering, 2019
Francesca Capaci, Erik Vanhatalo, Murat Kulahci, Bjarne Bergquist
The files of the revised model are available as a Simulink/Matlab® code at the Tennessee Eastman Archive (Updated TE code by Bathelt et al. (2015b)). Figure 2 illustrates the workflow to initialize the simulator through a simulation test, using the BPMN standard (Chinosi and Trombetta 2012). The simulator requires three phases to be initialized: installation, test, and use. The installation mainly consists of downloading the files and setting them in the same computer directory. Then a simulation test can be launched to check if the installation has been successful. During the simulation test, four online plots display the reactor pressure, process operating cost, production flow, and product quality trend. When the simulation ends, the simulator provides datasets of XMVs and XMEAs as well as the related plots. The correct completion of the installation and test phases ensures that the simulator works properly and it is ready to be used. Initialization is then completed.