Can Uras - Academia.edu (original) (raw)

Papers by Can Uras

In this tutorial we review the physical implementation of quantum computing using a system of col... more In this tutorial we review the physical implementation of quantum computing using a system of cold trapped ions. We discuss systematically all the aspects for making the implementation possible. Firstly, we go through the loading and con®ning of atomic ions in the linear Paul trap, then we describe the collective vibrational motion of trapped ions. Further, we discuss interactions of the ions with a laser beam. We treat the interactions in the travellingwave and standing-wave con®guration for dipole and quadrupole transitions. We review di erent types of laser cooling techniques associated with trapped ions. We address Doppler cooling, sideband cooling in and beyond the Lamb± Dicke limit, sympathetic cooling and laser cooling using electromagnetically induced transparency. After that we discuss the problem of state detection using the electron shelving method. Then quantum gates are described. We introduce single-qubit rotations, two-qubit controlled-NOT and multi-qubit controlled-NOT gates. We also comment on more advanced multiple-qubit logic gates. We describe how quantum logic networks may be used for the synthesis of arbitrary pure quantum states. Finally, we discuss the speed of quantum gates and we also give some numerical estimations for them. A discussion of dynamics on o -resonance transitions associated with a qualitative estimation of the weak-coupling regime is included in Appendix A and of the Lamb±Dicke regime in Appendix B.

Sperm whales are known to dive to a depth of over two thousand meters and it is also known that t... more Sperm whales are known to dive to a depth of over two thousand meters and it is also known that they emit loud impulsive broadband sounds called "clicks" during their diving. However, little is known about sperm whales' behavior because of a shortage of methods to observe them during their dives. Our attempt is to use the autonomous underwater vehicle (AUV) as an observation platform for sperm whales. The tasks of AUV are to recognize sperm whales individually and track them in real time by listening to sperm whale's clicks with 4-hydrophone array and detecting its direction. As the initial stage for these objectives, we set up an experiment for our observation system using a boat instead of AUV and a support boat. In the middle of August 2003, we carried out an experiment to test our observation system off Ogasawara Islands. Two boats, each with a hydrophone array were deployed mainly in the west or southeast of Chichijima Island in an ocean depth of about 1000 meters. During the experiments over five days we encountered at least fourteen sperm whales. The result of this experiment indicates that our observation system is suitable for tracking sperm whales in sub-real time. We also acquired sufficient sound data of sperm whale's vocalization for off-line verification. The analysis of the results is presently underway. This experiment can be considered as the preliminary step to apply this kind of technique to develop innovative observation for underwater ecosystem system using AUVs.

The authors have been developing an acoustic observation system that can record the high frequenc... more The authors have been developing an acoustic observation system that can record the high frequency bio-sonar clicks of the Ganges river dolphins and can estimate their 3-D location in real-time. In order to expand the coverage of the acoustic measurement, a new integrated observation system, which consists of one main array system and the newly developed multiple small array system, is proposed. For the first step, we deployed one main array and one small 4-hydrophone cross array system in the Ganges River. Combining the measurement results of the two array systems, we successfully obtained improved estimates of acoustic positions of the sound source than that of a single stand-alone measurement.

Theory of Computing Systems / Mathematical Systems Theory, 1973

Introduction. The purpose of this paper is twofold. The first is to re-investigate parallelizabil... more Introduction. The purpose of this paper is twofold. The first is to re-investigate parallelizability of local dynamical systems from the categorical point of view, and the second is to classify parallel flows on homeomorphic phase spaces by isomorphism.

The introduction of multidrug therapy by the World Health Organization has dramatically reduced t... more The introduction of multidrug therapy by the World Health Organization has dramatically reduced the world prevalence of leprosy but the disease is still a public health problem in many countries, with a world prevalence of almost 600,000 cases in 2001. Damage to peripheral nerves is a key component of leprosy and the sensory and motor loss that follows is the basis for many of the classical features of this disease, such as skin wounds, cracks, plantar ulcers, clawed hands, drop foot, and incomplete closure of the eyelids. One of the most remarkable aspects of leprosy to lay persons and health care workers alike is that patients are reputed to feel no pain. However, neuropathic pain is arising as a major problem among leprosy patients. It can be nociceptive due to tissue inflammation, which mostly occurs during episodes of immune activation or neuropathic due to damage or dysfunction of the nervous system. This study, conducted among 358 leprosy patients, reveals a considerable prevalence of neuropathic pain and presents evidence that this common problem should be a high priority of those in charge of leprosy control programs.

This note describes two different methods for motion segmentation from optical flow. In the first... more This note describes two different methods for motion segmentation from optical flow. In the first method, the Jacobian matrix of the first spatial derivatives of the components of optical flow is used to compute the amount of uniform expansion, pure rotation, and shear at every flow point. In the second description, local properties of optical flow which are invariant for non-singular linear transformation are computed from the trace and the determinant of the matrix itself. Both the methods allow to distinguish between different kinds of motion, like translation, rotation, and relative motion in sequences of time-varying images. Preliminary results show that they can also be useful to identify the different moving objects in the viewed scene.

Clinical and Applied Thrombosis-hemostasis, 2011

The aim of this study is to investigate the effects of exogenous L-arginine and HDL on LDL and ox... more The aim of this study is to investigate the effects of exogenous L-arginine and HDL on LDL and oxidized LDL (ox-LDL)-mediated platelet activation. Adenosine diphosphate (ADP)-activated platelets have been incubated with lipoproteins with or without L-arginine. P-selectin receptor numbers per platelet have been measured by flow cytometry. After incubation with only L-arginine (without lipoproteins), platelet nitric oxide (NO) levels and P-selectin receptor numbers significantly increased compared to the controls (P < .05). After incubation with LDL or ox-LDL, receptor numbers of P-selectin significantly increased (P < .001). However, P-selectin receptor numbers in platelets treated with L-arginine + LDL or L-arginine + ox-LDL decreased compared to the levels in platelets treated with only LDL or ox-LDL (P < .01, P < .001, respectively). Addition of HDL to L-arginine + ox-LDL caused significant reduction in P-selectin receptor numbers as in the control values (P < .001).We have concluded that L-arginine causes enhanced platelet NO levels and blocks the effects of LDL or ox-LDL on platelet P-selectin receptor numbers and HDL also strengthens this effect of L-arginine.

Thescientificworldjournal, 2001

Prion diseases are a group of fatal neurodegenerative disorders, and thought to be caused by the ... more Prion diseases are a group of fatal neurodegenerative disorders, and thought to be caused by the accumulation of an infectious protease-resistant isoform of prion protein (PrPSc). Mysteriously, the cattle exposed to infectious feed do not necessarily catch bovine spongiform encephalopathy (BSE). For one reason, we assumed that some constituents in forage grasses inhibit the infection of BSE. We therefore investigated whether some forage grasses show inhibitory effects on the formation of PrPSc.

This paper proposes a hybrid research environment consists of a virtual underwater-world simulato... more This paper proposes a hybrid research environment consists of a virtual underwater-world simulator called MVS (multi-vehicle simulator) and a pair of actual test-bed underwater robots called Twin-Burger I and II. The MVS is able to produce virtual world information in real-time which can be customized for the robots' workspace. In this environment, the robots can interact with the MVS via high speed serial communication link and behave as if they were swimming in the underwater-world even in the case they are deployed in a simple shaped testing-pool. This world which is virtually created using the sensory information of both the real and a virtual world is called “synthetic world”. By testing in the synthetic world, the efficiency of underwater systems' development is improved because the software can be developed directly on the embedded computer system and the hardware/software cross-checking can be easily conducted. This paper shows the detailed descriptions and unique characteristics of the proposed research environment and the practical example of the software development for underwater robots

Döküm, metal veya alaşımların ergitilerek önceden hazırlanmış bir kalıp boşluğuna doldurulması il... more Döküm, metal veya alaşımların ergitilerek önceden hazırlanmış bir kalıp boşluğuna doldurulması ile parça imalatını kapsamaktadır. Bir adımda basit veya karmaşık şekilli parçalar ergitilebilen herhangi bir malzemeden üretilebilir. Nihai ürün dizayn mühendisinin istediği şekillerin tamamına sahiptir. Bunlara ilaveten kalıntı gerilmeler minimum düzeyde tutularak, özel uygulama alanları için yöne bağlı özellikler yönlendirilmiş katılaşma ile geliştirilebilir veya kalıp dizaynı, döküm parametrelerinin optimizasyonu ve çekirdekleyici ilavesiyle katılaşma kontrol altında tutularak eş eksenli tane yapısına sahip ve özellikleri her yönde aynı izotropik bir malzeme elde edilebilir.

In this tutorial we review the physical implementation of quantum computing using a system of col... more In this tutorial we review the physical implementation of quantum computing using a system of cold trapped ions. We discuss systematically all the aspects for making the implementation possible. Firstly, we go through the loading and con®ning of atomic ions in the linear Paul trap, then we describe the collective vibrational motion of trapped ions. Further, we discuss interactions of the ions with a laser beam. We treat the interactions in the travellingwave and standing-wave con®guration for dipole and quadrupole transitions. We review di erent types of laser cooling techniques associated with trapped ions. We address Doppler cooling, sideband cooling in and beyond the Lamb± Dicke limit, sympathetic cooling and laser cooling using electromagnetically induced transparency. After that we discuss the problem of state detection using the electron shelving method. Then quantum gates are described. We introduce single-qubit rotations, two-qubit controlled-NOT and multi-qubit controlled-NOT gates. We also comment on more advanced multiple-qubit logic gates. We describe how quantum logic networks may be used for the synthesis of arbitrary pure quantum states. Finally, we discuss the speed of quantum gates and we also give some numerical estimations for them. A discussion of dynamics on o -resonance transitions associated with a qualitative estimation of the weak-coupling regime is included in Appendix A and of the Lamb±Dicke regime in Appendix B.

Sperm whales are known to dive to a depth of over two thousand meters and it is also known that t... more Sperm whales are known to dive to a depth of over two thousand meters and it is also known that they emit loud impulsive broadband sounds called "clicks" during their diving. However, little is known about sperm whales' behavior because of a shortage of methods to observe them during their dives. Our attempt is to use the autonomous underwater vehicle (AUV) as an observation platform for sperm whales. The tasks of AUV are to recognize sperm whales individually and track them in real time by listening to sperm whale's clicks with 4-hydrophone array and detecting its direction. As the initial stage for these objectives, we set up an experiment for our observation system using a boat instead of AUV and a support boat. In the middle of August 2003, we carried out an experiment to test our observation system off Ogasawara Islands. Two boats, each with a hydrophone array were deployed mainly in the west or southeast of Chichijima Island in an ocean depth of about 1000 meters. During the experiments over five days we encountered at least fourteen sperm whales. The result of this experiment indicates that our observation system is suitable for tracking sperm whales in sub-real time. We also acquired sufficient sound data of sperm whale's vocalization for off-line verification. The analysis of the results is presently underway. This experiment can be considered as the preliminary step to apply this kind of technique to develop innovative observation for underwater ecosystem system using AUVs.

The authors have been developing an acoustic observation system that can record the high frequenc... more The authors have been developing an acoustic observation system that can record the high frequency bio-sonar clicks of the Ganges river dolphins and can estimate their 3-D location in real-time. In order to expand the coverage of the acoustic measurement, a new integrated observation system, which consists of one main array system and the newly developed multiple small array system, is proposed. For the first step, we deployed one main array and one small 4-hydrophone cross array system in the Ganges River. Combining the measurement results of the two array systems, we successfully obtained improved estimates of acoustic positions of the sound source than that of a single stand-alone measurement.

Theory of Computing Systems / Mathematical Systems Theory, 1973

Introduction. The purpose of this paper is twofold. The first is to re-investigate parallelizabil... more Introduction. The purpose of this paper is twofold. The first is to re-investigate parallelizability of local dynamical systems from the categorical point of view, and the second is to classify parallel flows on homeomorphic phase spaces by isomorphism.

The introduction of multidrug therapy by the World Health Organization has dramatically reduced t... more The introduction of multidrug therapy by the World Health Organization has dramatically reduced the world prevalence of leprosy but the disease is still a public health problem in many countries, with a world prevalence of almost 600,000 cases in 2001. Damage to peripheral nerves is a key component of leprosy and the sensory and motor loss that follows is the basis for many of the classical features of this disease, such as skin wounds, cracks, plantar ulcers, clawed hands, drop foot, and incomplete closure of the eyelids. One of the most remarkable aspects of leprosy to lay persons and health care workers alike is that patients are reputed to feel no pain. However, neuropathic pain is arising as a major problem among leprosy patients. It can be nociceptive due to tissue inflammation, which mostly occurs during episodes of immune activation or neuropathic due to damage or dysfunction of the nervous system. This study, conducted among 358 leprosy patients, reveals a considerable prevalence of neuropathic pain and presents evidence that this common problem should be a high priority of those in charge of leprosy control programs.

This note describes two different methods for motion segmentation from optical flow. In the first... more This note describes two different methods for motion segmentation from optical flow. In the first method, the Jacobian matrix of the first spatial derivatives of the components of optical flow is used to compute the amount of uniform expansion, pure rotation, and shear at every flow point. In the second description, local properties of optical flow which are invariant for non-singular linear transformation are computed from the trace and the determinant of the matrix itself. Both the methods allow to distinguish between different kinds of motion, like translation, rotation, and relative motion in sequences of time-varying images. Preliminary results show that they can also be useful to identify the different moving objects in the viewed scene.

Clinical and Applied Thrombosis-hemostasis, 2011

The aim of this study is to investigate the effects of exogenous L-arginine and HDL on LDL and ox... more The aim of this study is to investigate the effects of exogenous L-arginine and HDL on LDL and oxidized LDL (ox-LDL)-mediated platelet activation. Adenosine diphosphate (ADP)-activated platelets have been incubated with lipoproteins with or without L-arginine. P-selectin receptor numbers per platelet have been measured by flow cytometry. After incubation with only L-arginine (without lipoproteins), platelet nitric oxide (NO) levels and P-selectin receptor numbers significantly increased compared to the controls (P < .05). After incubation with LDL or ox-LDL, receptor numbers of P-selectin significantly increased (P < .001). However, P-selectin receptor numbers in platelets treated with L-arginine + LDL or L-arginine + ox-LDL decreased compared to the levels in platelets treated with only LDL or ox-LDL (P < .01, P < .001, respectively). Addition of HDL to L-arginine + ox-LDL caused significant reduction in P-selectin receptor numbers as in the control values (P < .001).We have concluded that L-arginine causes enhanced platelet NO levels and blocks the effects of LDL or ox-LDL on platelet P-selectin receptor numbers and HDL also strengthens this effect of L-arginine.

Thescientificworldjournal, 2001

Prion diseases are a group of fatal neurodegenerative disorders, and thought to be caused by the ... more Prion diseases are a group of fatal neurodegenerative disorders, and thought to be caused by the accumulation of an infectious protease-resistant isoform of prion protein (PrPSc). Mysteriously, the cattle exposed to infectious feed do not necessarily catch bovine spongiform encephalopathy (BSE). For one reason, we assumed that some constituents in forage grasses inhibit the infection of BSE. We therefore investigated whether some forage grasses show inhibitory effects on the formation of PrPSc.

This paper proposes a hybrid research environment consists of a virtual underwater-world simulato... more This paper proposes a hybrid research environment consists of a virtual underwater-world simulator called MVS (multi-vehicle simulator) and a pair of actual test-bed underwater robots called Twin-Burger I and II. The MVS is able to produce virtual world information in real-time which can be customized for the robots' workspace. In this environment, the robots can interact with the MVS via high speed serial communication link and behave as if they were swimming in the underwater-world even in the case they are deployed in a simple shaped testing-pool. This world which is virtually created using the sensory information of both the real and a virtual world is called “synthetic world”. By testing in the synthetic world, the efficiency of underwater systems' development is improved because the software can be developed directly on the embedded computer system and the hardware/software cross-checking can be easily conducted. This paper shows the detailed descriptions and unique characteristics of the proposed research environment and the practical example of the software development for underwater robots

Döküm, metal veya alaşımların ergitilerek önceden hazırlanmış bir kalıp boşluğuna doldurulması il... more Döküm, metal veya alaşımların ergitilerek önceden hazırlanmış bir kalıp boşluğuna doldurulması ile parça imalatını kapsamaktadır. Bir adımda basit veya karmaşık şekilli parçalar ergitilebilen herhangi bir malzemeden üretilebilir. Nihai ürün dizayn mühendisinin istediği şekillerin tamamına sahiptir. Bunlara ilaveten kalıntı gerilmeler minimum düzeyde tutularak, özel uygulama alanları için yöne bağlı özellikler yönlendirilmiş katılaşma ile geliştirilebilir veya kalıp dizaynı, döküm parametrelerinin optimizasyonu ve çekirdekleyici ilavesiyle katılaşma kontrol altında tutularak eş eksenli tane yapısına sahip ve özellikleri her yönde aynı izotropik bir malzeme elde edilebilir.