|
|
On the increase of cutting performance of thread cutting taps with PVD coatings
Grygárek, David ; Fiala, Zdeněk (referee) ; Píška, Miroslav (advisor)
This diploma thesis deals with HSS cutting taps performance in combination with very hard and tribological PVD coating application and their contribution to increasing of cutting properties. Then is described the mechanisms and forms of cutting tool wear. The goal of the experimental part of the thesis was determine, compare and subsequently evaluate cutting properties of threading tools using taps with different types of PVD coatings. During realization of the experiment, constant cutting conditions have been ensured and the only variable were the different types of coating layers. The result of the experiment was measurement of cutting torques depending on time and rate of wear of cutting tools. Measured value are statistically processed and drawn conclusion.
|
|
|
Security of VoIP protocols
Novotný, František ; Číka, Petr (referee) ; Krajsa, Ondřej (advisor)
This bachelor dissertation deals with the VoIP (Voice over Internet Protocol) safety. The most used transport and signal protocols employing this technology are presented first. Two extended protocols, SIP (Session Initiation Protocol) and IAX (Inter-Asterisk eXchange Protocol), as well as open source Asterisk, which is closely connected with these protocols, are shown in detail. After that, methods, attacks and threats able to assure secure transfer in the use of VoIP among users are described. Afterwards the practical part of this essay, divided into two parts, is presented. In the first part, a passive attack in the form of tapping is demonstrated, and in the second, active attacks are described which take the form of forced cancellations and forwarded calls between two communicating users. With both attacks, safety measures that could effectively prevent against their potential attacking are proposed. In the closing part, the VoIP safety is evaluated for securing a quality connection between users communicating through it.
|
|
|
Technology project and layout for holder
Skrýval, Tomáš ; Novotný, Karel (referee) ; Rumíšek, Pavel (advisor)
The project conceived within engineer‘s studies of branch 2303T002 is showing holder produce technology using by the company UniTools Press CZ Valašské Meziříčí. This holder is a part of car seat-adjusting system dedicated for Peugeot 308. According to the literary research, next part of this project is submitting two diferent solutions of produce technology and then it chooses the best one. The best one is chosen with the help of weight values table. The holder is produced in associated tool on press Arisa 400 with nominal force 4000 kN. The holder is manufactured from the roll of sheet steel S355MC (thickness 3mm). In the last part this project is suggesting the modification of produce technology in order to increase tapping tool working life and to increase the production productivity. Keywords: The steel S355MC, tapping, associated tool. y
|
|
|
Interpretace tradičních strukturálních principů v konstrukcích dočasného charakteru
Joja, Marie
The paper focuses on traditional structural principles of historical buildings of the era 18 to 19 century in the Znojmo region, which are also included in the project „Identification and interpretation of origins, forms and transformations of Baroque cultural landscape of the South Moravian Borderland“. The aim of this work is to describe traditional roof frames of selected historical buildings of the area. The goal of the work is to find a suitable construction detail applied in the traditional roof frames, which would be used for a structure of temporary character. Temporary structures are associated with transient functional use, which can be one of the possible phases in the planned restoration of abandoned sites. The existence of many examples at the international level demonstrates successful redesign of dilapidated buildings by the use of temporary programme. The analysis of traditional structures proposed a suitable structural joint for a design of a modular element for the construction of temporary architecture. Its characteristic is the low-cost production and simple construction, which can be relocated to other places and adapted for further use. The significance of the work lies in the design of elementary structures of objects of a transitory nature, which are based on the traditional building principles of historical monuments and try to preserve structural uniqueness of the architecture.
|
|
|
On the increase of cutting performance of thread cutting taps with PVD coatings
Grygárek, David ; Fiala, Zdeněk (referee) ; Píška, Miroslav (advisor)
This diploma thesis deals with HSS cutting taps performance in combination with very hard and tribological PVD coating application and their contribution to increasing of cutting properties. Then is described the mechanisms and forms of cutting tool wear. The goal of the experimental part of the thesis was determine, compare and subsequently evaluate cutting properties of threading tools using taps with different types of PVD coatings. During realization of the experiment, constant cutting conditions have been ensured and the only variable were the different types of coating layers. The result of the experiment was measurement of cutting torques depending on time and rate of wear of cutting tools. Measured value are statistically processed and drawn conclusion.
|
|
|
Security of VoIP protocols
Novotný, František ; Číka, Petr (referee) ; Krajsa, Ondřej (advisor)
This bachelor dissertation deals with the VoIP (Voice over Internet Protocol) safety. The most used transport and signal protocols employing this technology are presented first. Two extended protocols, SIP (Session Initiation Protocol) and IAX (Inter-Asterisk eXchange Protocol), as well as open source Asterisk, which is closely connected with these protocols, are shown in detail. After that, methods, attacks and threats able to assure secure transfer in the use of VoIP among users are described. Afterwards the practical part of this essay, divided into two parts, is presented. In the first part, a passive attack in the form of tapping is demonstrated, and in the second, active attacks are described which take the form of forced cancellations and forwarded calls between two communicating users. With both attacks, safety measures that could effectively prevent against their potential attacking are proposed. In the closing part, the VoIP safety is evaluated for securing a quality connection between users communicating through it.
|
|
|
Technology project and layout for holder
Skrýval, Tomáš ; Novotný, Karel (referee) ; Rumíšek, Pavel (advisor)
The project conceived within engineer‘s studies of branch 2303T002 is showing holder produce technology using by the company UniTools Press CZ Valašské Meziříčí. This holder is a part of car seat-adjusting system dedicated for Peugeot 308. According to the literary research, next part of this project is submitting two diferent solutions of produce technology and then it chooses the best one. The best one is chosen with the help of weight values table. The holder is produced in associated tool on press Arisa 400 with nominal force 4000 kN. The holder is manufactured from the roll of sheet steel S355MC (thickness 3mm). In the last part this project is suggesting the modification of produce technology in order to increase tapping tool working life and to increase the production productivity. Keywords: The steel S355MC, tapping, associated tool. y
|
guest ::
