Middleware’s message : the financial technics of codata

In this paper, I will argue for the relevance of certain distinctive features of messaging systems, namely those in which data (a) can be sent and received asynchronously, (b) can be sent to multiple simultaneous recipients and (c) is received as a “potentially infinite” flow of unpredictable events. I will describe the social technology of the stock ticker, a telegraphic device introduced at the New York Stock Exchange in the 1860s, with reference to early twentieth century philosophers of synchronous experience (Bergson), simultaneous sign interpretations (Mead and Peirce), and flows of discrete events (Bachelard). Then, I will show how the ticker’s data flows developed into the 1990s-era technologies of message queues and message brokers, which distinguished themselves through their asynchronous implementation of ticker-like message feeds sent between otherwise incompatible computers and terminals. These latter systems’ characteristic “publish/subscribe” communication pattern was one in which conceptually centralized (if logically distributed) flows of messages would be “published,” and for which “subscribers” would be spontaneously notified when events of interest occurred. This paradigm—common to the so-called “message-oriented middleware” systems of the late 1990s—would re-emerge in different asynchronous distributed system contexts over the following decades, from “push media” to Twitter to the Internet of Things

Mission Information and Test Systems Summary of Accomplishments, 2011

This annual report covers the activities of the NASA DRFC Mission Information and Test Systems, which includes the Western Aeronautical Test Range, the Simulation Engineering Branch, the Information Services and the Dryden Technical Laboratory (Flight Loads Lab). This report contains highlights, current projects and various awards achieved during in 201

CaSPiS: A Calculus of Sessions, Pipelines and Services

Service-oriented computing is calling for novel computational models and languages with well disciplined primitives for client-server interaction, structured orchestration and unexpected events handling. We present CaSPiS, a process calculus where the conceptual abstractions of sessioning and pipelining play a central role for modelling service-oriented systems. CaSPiS sessions are two-sided, uniquely named and can be nested. CaSPiS pipelines permit orchestrating the flow of data produced by different sessions. The calculus is also equipped with operators for handling (unexpected) termination of the partner’s side of a session. Several examples are presented to provide evidence of the flexibility of the chosen set of primitives. One key contribution is a fully abstract encoding of Misra et al.’s orchestration language Orc. Another main result shows that in CaSPiS it is possible to program a “graceful termination” of nested sessions, which guarantees that no session is forced to hang forever after the loss of its partner

Can bank interaction during rating measurement of micro and very small enterprises ipso facto Determine the collapse of PD status?

This paper begins with an analysis of trends - over the period 2012-2018 - for total bank loans, non-performing loans, and the number of active, working enterprises. A review survey was done on national data from Italy with a comparison developed on a local subset from the Sardinia Region. Empirical evidence appears to support the hypothesis of the paper: can the rating class assigned by banks - using current IRB and A-IRB systems - to micro and very small enterprises, whose ability to replace financial resources using endogenous means is structurally impaired, ipso facto orient the results of performance in the same terms of PD assigned by the algorithm, thereby upending the principle of cause and effect? The thesis is developed through mathematical modeling that demonstrates the interaction of the measurement tool (the rating algorithm applied by banks) on the collapse of the loan status (default, performing, or some intermediate point) of the assessed micro-entity. Emphasis is given, in conclusion, to the phenomenon using evidence of the intrinsically mutualistic link of the two populations of banks and (micro) enterprises provided by a system of differential equation

Taylor Place- Fire Life Safety Report

This document is a Fire and Life Safety Report on the Taylor Place Dormitory located in Phoenix, Arizona as part of the Arizona State University (ASU) downtown campus. The building was evaluated on a prescriptive basis based on the current City of Phoenix building codes and further evaluated on using performance based methods from the Society of Fire Protection Engineers (SFPE) Handbook and National Fire Protection Association (NFPA) 101 Life Safety Code®. These building features and systems were evaluated using prescriptive methods: General construction, fire resistive construction and fire resistive separations Occupancy, Life safety features and building egress Smoke management systems and features Fire protection systems, fire sprinkler, suppression systems, fire alarm Emergency and standby power, elevators, communication systems, and lighting A performance-based analysis of the South Tower and Ground Floor Cafeteria and Assembly space using NFPA 101 Life Safety Code® Chapter 5 as a guide. The analysis of the South Tower was based on NFPA 5.5.3.1 and a typical fire for the occupancy accounting for occupants, number and location, room sizes, contents, fuel properties, ventilations, and identifying the location of the item ignited. The analysis of the Ground Floor Cafeteria and Assembly Area was based on NFPA 5.5.3.2 and an ultra-fast fire in the primary means of egress reducing the overall means of egress by two double door exits. These scenarios are analyzed using tenability criteria to determine if with the given the design fire, all occupants can exit safely. Taylor Place generally meets or exceeds the prescriptive requirements for the system described above provided in the building code. Two specific areas were identified requiring further analysis: the corridor and two-story vertical opening separation is not provided in the South Tower per PBC Section 712, and the reduction in the door size of the south egress corridor on the ground floor. Both of these issues were addressed in conjunction with the performance based analysis and found to be acceptable with the current set of performance based recommendations. The performance-based analysis was largely successful. The analysis of the ground floor egress given an ultrafast fire located near the southwest corner of the assembly space found occupants Required Safe Egress Time (RSET) was greater than the Available Safe Egress Time (ASET) meaning all occupants egressed safely. The visibility was lost in the cafeteria which caused the failure of the tenability criteria and the determination of the ASET. The second analysis of the two-story vertical common area in the south tower failed the tenability criteria for visibility during the first two evaluations. It was determined that the two furniture standards as part of the ASU design guidelines varied greatly in fire behavior and smoke production. As a result, the furniture in the common areas meet the recommended requirements, the corridors will not require separation from the common area. As part of the evaluation process, there are additional recommendations in the report including the addition low level egress signage in the corridors to aid egress, a smoke barrier in the entrance lobby, and the reasons are discussed in more detail in the report. Comments and recommendations can be found at the end of each section providing additional detail in specific areas. The end of the report focuses on Commissioning of fire protection and building systems. A team is needed to effectively test all of the fire protection systems in accordance with their performance requirements. Functional tests performed on each system to ensure each systems were installed correctly. For example, stair pressurization systems can rely on several fans to pressurize each stairwell. A functional test will typically quickly reveal problem areas and you may even find a motor running backwards. Valuable information is provided from this stage in the project to identify maintenance requirements and finalize documentation. Fire fighter operation overviews need to be assembled, operation and maintenance manuals need to be created for building staff, and fire safety plans need to be implemented. It is very much a documentation and punch list phase of the project

Информационные технологии и математическое моделирование (ИТММ-2019) : материалы XVIII Международной конференции им. А. Ф. Терпугова, 26−30 июня 2019 г. Ч. 2

Сборник содержит избранные материалы XVIII Международной конференции имени А.Ф. Терпугова по следующим направлениям: теория массового обслуживания и телетрафика, графы и их применение в задачах анализа дискретных автоматов, прикладной вероятностный анализ. Для специалистов в области информационных технологий и математического моделирования.Текст на рус. и англ. яз