Research and development of on board control systems and elements for aerospace vehicles

Onboard control systems and elements for aerospace vehicles - signal noise in fluid amplifier, hydraulic and pneumatic stepping motors, fluid transmission line dynamics, analog computer circuits, electric servomotor, and closed cycle

Video enhancement of X-ray and neutron radiographs

System was devised for displaying radiographs on television screen and enhancing fine detail in picture. System uses analog-computer circuits to process television signal from low-noise television camera. Enhanced images are displayed in black and white and can be controlled to vary degree of enhancement and magnification of details in either radiographic transparencies or opaque photographs

Beyond Moore's technologies: operation principles of a superconductor alternative

The predictions of Moore's law are considered by experts to be valid until 2020 giving rise to "post-Moore's" technologies afterwards. Energy efficiency is one of the major challenges in high-performance computing that should be answered. Superconductor digital technology is a promising post-Moore's alternative for the development of supercomputers. In this paper, we consider operation principles of an energy-efficient superconductor logic and memory circuits with a short retrospective review of their evolution. We analyze their shortcomings in respect to computer circuits design. Possible ways of further research are outlined.Comment: OPEN ACCES

Computer Circuits

U radu su opisane vrste računalne logike: kombinacijska i sekvencijalna. Kombinacijska logika odnosi se na logičke strujne krugove kojima izlazne vrijednosti ovise isključivo o trenutnim ulaznim vrijednostima. Ovakvi strujni krugovi mogu se poistovjetiti s Booleovim izrazima. Sekvencijalna logika je poopćenje kombinacijske: uz sve elemente kombinacijske logike još dodatno ima i element za pohranu podataka. Može se reći i da je to logika kod koje izlazne vrijednosti strujnih krugova ovise i o prijašnjim ulaznim vrijednostima. Sekvencijalna logika može se podijeliti na asinkronu i sinkronu. Kod asinkrone logike, elementi za spremanje podataka odmah reagiraju na svaku promjenu ulaznih podataka. To u određenim situacijama može dovesti do krivih rezultata što je ujedno i glavni nedostatak ove logike. Sinkrona logika je odgovor na ovaj problem, ali je dosta sporija od asinkrone.In this work I explain two dierent types of computer logic: combinational and sequential. Combinational logic refers to logic circuits whose outputs depend only on current input values. Such logic circuits can be identied with Boolean expression. Sequential logic is generalization of combinational logic: it contains all the elements of combinational logic and has a special memory element. We can also say that sequential logic is logic whose outputs depend also on previous input values. Sequential logic can be divided into asynchronous and synchronous. Memory elements in asynchronous logic immediatelly react to any input change which in certain cases can give us wrong results. is is the main disadvantage of asynchronous logic. is problem is xed in synchronous logic but, because of that, this logic is much slower than asynchronous logic

Electronic equipment, systems, and techniques: A compilation

Electronic circuits with specialized computer applications and control circuits are presented. Patent information is included

Implementation of interconnect simulation tools in spice

Accurate computer simulation of high speed digital computer circuits and communication circuits requires a multimode approach to simulate both the devices and the interconnects between devices. Classical circuit analysis algorithms (lumped parameter) are needed for circuit devices and the network formed by the interconnected devices. The interconnects, however, have to be modeled as transmission lines which incorporate electromagnetic field analysis. An approach to writing a multimode simulator is to take an existing software package which performs either lumped parameter analysis or field analysis and add the missing type of analysis routines to the package. In this work a traditionally lumped parameter simulator, SPICE, is modified so that it will perform lossy transmission line analysis using a different model approach. Modifying SPICE3E2 or any other large software package is not a trivial task. An understanding of the programming conventions used, simulation software, and simulation algorithms is required. This thesis was written to clarify the procedure for installing a device into SPICE3E2. The installation of three devices is documented and the installations of the first two provide a foundation for installation of the lossy line which is the third device. The details of discussions are specific to SPICE, but the concepts will be helpful when performing installations into other circuit analysis packages