نتایج جستجو برای: stpa

تعداد نتایج: 216  

Journal: :International Journal of Safety and Security Engineering 2021

Systems composed of a fleet autonomous mobile robots are among the most complex control systems. This complexity is at high level especially when those navigate in hazardous and dynamic environments such as chemical analysis laboratories. These systems include different dangerous harmful products (toxic, flammable, explosive...) with quantity. In order to perform its mission on regular basis, t...

2015
Homa Alemzadeh Daniel Chen Andrew Lewis Zbigniew T. Kalbarczyk Jaishankar Raman Nancy Leveson Ravishankar K. Iyer

Robotic surgical systems are among the most complex medical cyberphysical systems on the market. Despite significant improvements in design of those systems through the years, there have been ongoing occurrences of safety incidents that negatively impact patients during procedures. This paper presents an approach for systems-theoretic safety assessment of robotic telesurgical systems using soft...

Journal: :Science 2011
Wenqin Wang Gene-Wei Li Chongyi Chen X Sunney Xie Xiaowei Zhuang

Bacterial chromosomes are confined in submicrometer-sized nucleoids. Chromosome organization is facilitated by nucleoid-associated proteins (NAPs), but the mechanisms of action remain elusive. In this work, we used super-resolution fluorescence microscopy, in combination with a chromosome-conformation capture assay, to study the distributions of major NAPs in live Escherichia coli cells. Four N...

2013
Ryosuke L. Ohniwa Hiroki Muchaku Shinji Saito Chieko Wada Kazuya Morikawa

Bacterial genomic DNA is packed within the nucleoid of the cell along with various proteins and RNAs. We previously showed that the nucleoid in log phase cells consist of fibrous structures with diameters ranging from 30 to 80 nm, and that these structures, upon RNase A treatment, are converted into homogeneous thinner fibers with diameter of 10 nm. In this study, we investigated the role of ma...

2003
Tatiana Pasternak James W. Bisley David Calkins

THE RETINA 139 The Retinal Image 139 Retinal design 140 Retinal Cell Types 141 What the Retina Responds To 147 Parallel Visual Pathways From The Retina 147 LATERAL GENICULATE NUCLEUS 148 Anatomy 148 Functional Properties 148 Effects Of Selective Lesions 149 CORTICAL PROCESSING Primary Visual Cortex (Striate Cortex, V1) 150 Area V2 155 Area V3 156 Parallel Functional Streams 157 VENTRAL VISUAL S...

Journal: :Nuclear Technology 2021

Digital instrumentation and control (I&C) upgrades are a vital research area for nuclear industry. Despite their performance benefits, deployment of digital I&C in power plants (NPPs) has been limited. systems exhibit complex failure modes including common cause failures (CCFs) which can be difficult to identify. This paper describes the development redundancy-guided application Systems-Theoret...

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