Number of found documents: 2080
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Analysis, Modeling and Enhancement of Scientific Images
Švihlík, Jan
2020 - English
Available in digital repository of ČVUT.
Analysis, Modeling and Enhancement of Scientific Images

Švihlík, Jan
České vysoké učení technické v Praze, 2020

Study on pervious recycled aggregate fiber-reinforced concrete for airfield pavement
Novák J.; Chylík R.; Trtík T.; Kohoutková A.
2020 - English
For the last several years, the attention has been devoted to the development of ecofriendly construction materials with the aim to reduce the environmental impact of construction. The integral part of this development is to find applications for which the recycled materials could be used efficiently. The presented study deals with the development of recycled aggregate fibre reinforced concrete which is going to be used for an innovative precast concrete pavement system. The system is being developed recently at Czech Technical University in Prague with the aim to provide a system for airfield pavement with rapid construction and recycled material utilization. The investigated material is going to be used for construction of a sub-base course which is underneath a surface course of precast concrete elements. Within the scope of the work,standard laboratory tests were conducted with the aim to observe mechanical properties of recycled aggregate fibre reinforced concrete. The obtained findings showed that the material exhibits ductile behaviour likely due to very long polypropylene fibres used for strengthening concrete matrix. On the contrary, the tested material has low modulus of elasticity in comparison with conventional concrete. Subsequently, the pilot construction of the sub-base course was carried out in order to examine both concrete mixture preparation and concrete course installation in practice. The obtained findings showed that a compaction ratio of the material is about 20%. Moreover, a flat surface of the sub-base course was hard to achieve considering the used manufacturing technology. Keywords: pervious concret; fiber reinforced concrete; airfiled pavement; recycled aggregate; flexural strength Available in digital repository of ČVUT.
Study on pervious recycled aggregate fiber-reinforced concrete for airfield pavement

For the last several years, the attention has been devoted to the development of ecofriendly construction materials with the aim to reduce the environmental impact of construction. The integral part ...

Novák J.; Chylík R.; Trtík T.; Kohoutková A.
České vysoké učení technické v Praze, 2020

RISK MANAGEMENT AT TECHNICAL FACILITIES DESIGNING, BUILDING AND COMMISSIONING
Procházková D.; Procházka J.
2020 - English
The publication subject is to show the risk management of complex technical facilities at a stage involving the design, construction, outfit by technology equipment, testing and commissioning. The safety of this technical facility is related to the entire technical facility because, as a result of the interconnections among different parts, the set of the safe parts is generally not safe. The safety also considers the dynamic evolution of the world. Therefore, it is going on managing the risks caused by all possible causes in time and space. Based on the original database of failures and accidents of technical facilities, which also included weaknesses in the area of design, building, construction, testing and commissioning, they are determined the basic categories of risk causes. Through the procedures of advanced risk disciplines, there are developed the tools for working with risks in the monitored stage of the technical facility aimed at ensuring the technical facility safety throughout its life time, namely: decision support system; and risk management plan. Both tools are in two versions. The book shortly summarizes results of specific research performed in project “Řízení rizik a bezpečnost složitých technologických objektů (RIRIZIBE)“ CZ.02.2.69/0.0 /0.0/16_018/000”. The detail results are in original Czech monograph, which is cited. Keywords: technical facility; risk; safety; risk engineering; decision support system; risk management plan Available in digital repository of ČVUT.
RISK MANAGEMENT AT TECHNICAL FACILITIES DESIGNING, BUILDING AND COMMISSIONING

The publication subject is to show the risk management of complex technical facilities at a stage involving the design, construction, outfit by technology equipment, testing and commissioning. The ...

Procházková D.; Procházka J.
České vysoké učení technické v Praze, 2020

Standard Cell Tuning Enables Data-Independent Static Power Consumption
Bělohoubek J.; Fišer P.; Schmidt J.
2020 - English
Physical attacks, namely invasive, observation and combined, represent a great challenge for today’s digital design. Successful class of strategies adopted by industry, allowing hiding data dependency of the side channel emissions in CMOS is based on balancing. Although attacks on CMOS dynamic power represent a class of state-of-the-art attacks, vulnerabilities exploiting data dependency in CMOS static power and light- modulated static power were recently presented. In this paper, we describe structures and techniques developed to enhance and balance traditional static CMOS bulk structures. To enable data dependency hiding, we propose low-level techniques based on complementary-value induced balancing currents, constant current source behavioral approximation, and light-sensing capability of traditional CMOS structures. The proposed techniques may be used to build a dual-rail circuit balanced from both perspectives: static and dynamic power. The publicly available TSMC180nm node standard cell simulation is used for evaluation. Keywords: security; power attacks; laser illumination; CMOS Available in digital repository of ČVUT.
Standard Cell Tuning Enables Data-Independent Static Power Consumption

Physical attacks, namely invasive, observation and combined, represent a great challenge for today’s digital design. Successful class of strategies adopted by industry, allowing hiding data dependency ...

Bělohoubek J.; Fišer P.; Schmidt J.
České vysoké učení technické v Praze, 2020

RISK MANAGEMENT AT TECHNICAL FACILITIES TYPE AND SITE SELECTION
Procházková D.; Procházka J.
2020 - English
Technical facilities are created by human activities, and their goal is to provide products or services for the humans´ lives. The technical facilities architecture is the object or the network. Each type of technical facility has its own specifics. Management of technical facilities´ safety is not easy and requires the application of specific engineering tools for coping with the expected risks. Due to complex architecture of majority of present technical facilities, their behaviours are sometimes unforeseeable, and therefore, special engineering tools need to be used at their type selection and sitting. In the past, the attention was not overly given to type selection and location of technical facility. Therefore, some technical facilities projects have not been completed, or after completing their operation have not met the expectations, or even they began to make serious problems, which meant substantial economic losses. Therefore, the book “Risk management at technical facilities type and site selection” deals with the problem of specification of the type of technical facilities and their location in the territory. It summarizes results of specific research performed in project “Řízení rizik a bezpečnost složitých technologických objektů (RIRIZIBE)“ CZ.02.2.69/0.0/0.0/ 16 _018/000”. Since, the deciding body on the subject is the public administration, they are compiled decision support and the risk management plan. Keywords: risk; safety; coexistence; type selection; sitting; technical facility Available in digital repository of ČVUT.
RISK MANAGEMENT AT TECHNICAL FACILITIES TYPE AND SITE SELECTION

Technical facilities are created by human activities, and their goal is to provide products or services for the humans´ lives. The technical facilities architecture is the object or the network. Each ...

Procházková D.; Procházka J.
České vysoké učení technické v Praze, 2020

RISK MANAGEMENT AND SETTLEMENT AT TECHNICAL FACILITIES OPERATION
Procházková D.; Procházka J.
2020 - English
The monograph deals with a risk management at the technical facilities operation for the benefit of safety; the management aim is to ensure their co-existence with their vicinity throughout their life cycles. The accidents´ and failures´ studies show that important factor is correct perfor-mance of responsibilities on different management levels. Assessment of legislations and organizations of present States shows that for technical facilities safety, they are also responsible politics and public administration. The present knowledge shows that for prevention of accidents and failures, it is necessary to avoid to: large mistakes in risk prevention; and origination of small mistakes, the realization of which in short time interval is dangerous. For this purpose, it is developed tool “Decision Support System” for determination of risk level of tech-nical facility during the operation respecting the present knowledge on technical facili-ties´ risks and safety and the lessons learned from the past accidents and failures of technical facilities, the causes of which were connected with their operation. Due to dynamic world development, technical facilities parts ageing, wear and tear, and limited human knowledge, sources and capabilities, the technical facilities´ management and public administration need to be prepared for future risk realizations, which can be different from the present ones. For this purpose, it is developed tool “Risk Management Plan” respecting the present knowledge on technical facilities´ responses and the lessons learned from the past responses to accidents and fail-ures of technical facilities, the causes of which were connected with their operation. Keywords: technical facility; risk; safety; operation; risk management; decision support sytem; risk managenet plan Available in digital repository of ČVUT.
RISK MANAGEMENT AND SETTLEMENT AT TECHNICAL FACILITIES OPERATION

The monograph deals with a risk management at the technical facilities operation for the benefit of safety; the management aim is to ensure their co-existence with their vicinity throughout their ...

Procházková D.; Procházka J.
České vysoké učení technické v Praze, 2020

RISK MANAGEMENT AT TECHNICAL FACILITIES DE-COMMISSIONING AND SITE REVITALISATION
Procházková D.; Procházka J.
2020 - English
Book is dedicated to the risk management of the process that includes: putting out the technical facilities from the operation; carrying out the dismantlement of fittings, constructions and buildings; transport of usable fittings, materials and waste, and in need case after their decontamination in the site; cleaning up the released territory, and in need case to perform its decontamination; and passing the released territory in the next civil use. This process is very important to ensure the long-term security and development of humans. The way of problems solving is based on at the simultaneously preferred risk management concept, i.e., the risk management targeted to the terri-tory safety, and in particular operations, the safety is put above to the reliability. The present publication “Risk management at technical facilities decommission-ing and site revitalisation“ summarizes problems and shows methods and proce-dures for their solution based on system concept and present findings and experi-ences from practice obtained by special research. It summarizes results of specific research performed in project “Řízení rizik a bezpečnost složitých technolog-ických objektů (RIRIZIBE)“ CZ.02.2.69/0.0/0.0/16 _018/000”. Keywords: risk; safety; coexistence; technical facility; decommissioning; devontamination; revitalization Available in digital repository of ČVUT.
RISK MANAGEMENT AT TECHNICAL FACILITIES DE-COMMISSIONING AND SITE REVITALISATION

Book is dedicated to the risk management of the process that includes: putting out the technical facilities from the operation; carrying out the dismantlement of fittings, constructions and buildings; ...

Procházková D.; Procházka J.
České vysoké učení technické v Praze, 2020

Risk management at technical facilities type and site selection
Procházková, Dana; Procházka, Jan
2020 - English
Technical facilities are created by human activities, and their goal is to provide products or services for the humans´ lives. The technical facilities architecture is the object or the network. Each type of technical facility has its own specifics; e.g. significant differ-ences exist between the control of stable technical facilities and mobile technical facil-ities. Stable technical facilities affect their surroundings during the whole life cycle, and therefore, their types and locations need to fulfil requirements so they might not seri-ously damage territory and its inhabitants. The control of object and network technical facilities has also its specifics. Technical facilities belong to the administration of the various sectors and include phys-ical, cyber, organizational and social systems, i.e. individual devices, machines, com-ponents, systems, or the entire production or the service units, and also personnel and way of organization. Large technical facilities represent the systems of systems, i.e. a number of open and mutually interconnected open systems, and therefore, their be-haviour is dynamic and depends on a number of factors. The problem-solution way is based on the simultaneously preferred concept, in which the safety is preferred over the reliability. Management of technical facilities´ safety is not easy and requires the application of specific engineering tools for coping with the expected risks. Due to complex architec-ture of majority of present technical facilities, their behaviours are sometimes unfore-seeable, and therefore, special engineering tools need to be used at their type selec-tion and sitting. In the past, the attention was not overly given to type selection and location of technical facility. Therefore, some technical facilities projects have not been completed, or after completing their operation have not met the expectations, or even they began to make serious problems, which meant substantial economic losses. Therefore, the book “Risk management at technical facilities type and site selection” deals with the problem of specification of the type of technical facilities and their location in the terri-tory. It summarizes results of specific research performed in project “Řízení rizik a bezpečnost složitých technologických objektů (RIRIZIBE)“ CZ.02.2.69/0.0/0.0/ 16 _018/000”. Since, the deciding body on the subject is the public administration, there are in the book for it produced the tools that will help it to choose the appropriate type of technical facility, which ensures the expected service or products, and to place it in the territory so that, the coexistence of the technical facility with its surroundings may have been during the technical facility life cycle. It goes on the system for decision support and the risk management plan. Available in digital repository of ČVUT.
Risk management at technical facilities type and site selection

Technical facilities are created by human activities, and their goal is to provide products or services for the humans´ lives. The technical facilities architecture is the object or the network. Each ...

Procházková, Dana; Procházka, Jan
České vysoké učení technické v Praze, 2020

ANALYSIS, MANAGEMENT AND TRADE-OFF WITH RISKS OF TECHNICAL FACILITIES
Procházková D.; Procházka J.
2020 - English
Submitted work “Analysis, management and trade-off with risk of technical facilities“ deals with the all type of risks associated with the technical facilities, particularly with the complex ones, with aim to ensure their safety. It demonstrates the ways of work with risks at phase of identification, analysis, assessment, management and putting under control aimed to the safety of both, the technical facilities and their surround-ings (i.e. their mutual coincidence), and simultaneously respecting the current knowledge that the risks are locally and time-specific. The safety is understood as a property on the level of the whole technical facility, which is determined by the quality of the file of anthropogenic measures and activi-ties aimed at the safe technical facility, and even at its critical conditions. Therefore, at safety make up, the publication proposes to monitor both, the public assets and the technical facility´ assets, and together to consider the diversity of their physical natures, vulnerabilities, and the constituent changes over time; which means contin-uously to solve emerging conflicts. procedures for the control and management of critical sit-uations. The publication “Analysis, management and trade-off with risks of technical facilities“ summarizes problems and shows methods and procedures for their solution based on system concept and present findings and experiences from practice obtained by detail research. It summarizes the results of specific research performed in project “Řízení rizik a bezpečnost složitých technologických objektů (RIRIZIBE)“ CZ.02.2.69/0.0/ 0.0/16_018/000”; detail data and results are in the Czech publication and in the CVUT archives. Keywords: risk; safety; security; reliability; technical facility; management; risk management; satety management Available in digital repository of ČVUT.
ANALYSIS, MANAGEMENT AND TRADE-OFF WITH RISKS OF TECHNICAL FACILITIES

Submitted work “Analysis, management and trade-off with risk of technical facilities“ deals with the all type of risks associated with the technical facilities, particularly with the complex ones, ...

Procházková D.; Procházka J.
České vysoké učení technické v Praze, 2020

Development and Calibration of Elasto-Plasticity Models with Directional Distortional Hardening
Plešek Jiří; Parma Slavomír; Džugan Jan
2019 - English
This thesis deals with the phenomenological modeling of the directional distortional hardening and the metal plasticity in general. A particular plasticity model is analytically integrated for the proportional multiaxial loading case. The integrated model is used to model the stress-strain curves, the hysteresis loops, and the cyclic stress-strain curves. Based on these curves, two calibration algorithms are developed. In the end, a sensitivity analysis of both calibration algorithms is done. A general aim of this thesis is to develop the procedures that would support an industrial application of advanced models with directional distortional hardening.Práce se zabývá fenomenologickým modelováním směrového deformačního zpevnění a obecně plasticity kovů. Konkrétní model je analyticky integrován pro případ víceosého proporcionálního zatěžování. Výsledná křivka je použita k modelování tahového diagramu, a dále k modelování hysterezních smyček a cyklických deformačních křivek. Na základě těchto analytických modelů jsou navrženy dva zcela nové algoritmy pro kalibraci parametrů modelu. V závěru je provedena citlivostní analýza obou kalibračních algoritmů. Obecným cílem práce je vývoj procedur pro průmyslovou aplikaci pokročilých modelů plasticity se směrovým deformačním zpevněním. Keywords: plasticity,strain hardening,integration,calibration,finite element method; plasticita,deformační zpevnění,integrace,kalibrace,metoda konečných prvků Available in digital repository of ČVUT.
Development and Calibration of Elasto-Plasticity Models with Directional Distortional Hardening

This thesis deals with the phenomenological modeling of the directional distortional hardening and the metal plasticity in general. A particular plasticity model is analytically integrated for the ...

Plešek Jiří; Parma Slavomír; Džugan Jan
České vysoké učení technické v Praze, 2019

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