Relevant bibliographies by topics / Clock

Academic literature on the topic 'Clock'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 August 2024

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Journal articles on the topic "Clock"

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Son, Kyou Jung, and Tae Gyu Chang. "Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System." Sensors 20, no. 20 (October 13, 2020): 5784. http://dx.doi.org/10.3390/s20205784.

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This paper proposes a distributed nodes-based clock synchronization method to sustain sub-microsecond precision synchronization of slave clocks upon master clock failure in IEEE 1588 PTP (precision time protocol) system. The sustaining is achieved by synchronizing the slave clocks to the estimated reference clock which is obtained from the analysis of distributed slave clocks. The proposed method consists of two clock correction functions (i.e., a self-correction and a collaborative correction, respectively). Upon master failure, the self-correction estimates a clock correction value based on the clock model which is constructed during normal PTP operation. The collaborative correction is performed in the preselected management node. The management node estimates a reference clock by collecting and analyzing clock information gathered from the other slave clocks. The performance of the proposed method is simulated by computer to show its usefulness. It is confirmed that the fifty (50) clock model-based collaborative correction maintains 10−6 second PTP accuracy for 10 min prolonged period after the master failure when tested with clock offset variations less than 50 ppm.
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Boldbaatar, Enkhtuvshin, Donald Grant, Suelynn Choy, Safoora Zaminpardaz, and Lucas Holden. "Evaluating Optical Clock Performance for GNSS Positioning." Sensors 23, no. 13 (June 28, 2023): 5998. http://dx.doi.org/10.3390/s23135998.

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Atomic clocks are highly precise timing devices used in numerous Positioning, Navigation, and Timing (PNT) applications on the ground and in outer space. In recent years, however, more precise timing solutions based on optical technology have been introduced as current technology capabilities advance. State-of-the-art optical clocks—predicted to be the next level of their predecessor atomic clocks—have achieved ultimate uncertainty of 1 × 10−18 and beyond, which exceeds the best atomic clock’s performance by two orders of magnitude. Hence, the successful development of optical clocks has drawn significant attention in academia and industry to exploit many more opportunities. This paper first provides an overview of the emerging optical clock technology, its current development, and characteristics, followed by a clock stability analysis of some of the successfully developed optical clocks against current Global Navigation Satellite System (GNSS) satellite clocks to discuss the optical clock potentiality in GNSS positioning. The overlapping Allan Deviation (ADEV) method is applied to estimate the satellite clock stability from International GNSS Service (IGS) clock products, whereas the optical clock details are sourced from the existing literature. The findings are (a) the optical clocks are more stable than that of atomic clocks onboard GNSS satellites, though they may require further technological maturity to meet spacecraft payload requirements, and (b) in GNSS positioning, optical clocks could potentially offer less than a 1 mm range error (clock-related) in 30 s and at least 10 times better timing performance after 900 s in contrast to the Galileo satellite atomic clocks—which is determined in this study as the most stable GNSS atomic clock type used in satellite positioning.
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Reddy, M. Praveen Kumar, K. Ashwin Kumar, S. Rajesh Kumar, and RA K. Saravanaguru. "Improvement of Physical Clock Synchronization Algorithm by Two-Level Synchronization." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 11, no. 6 (November 5, 2013): 2648–52. http://dx.doi.org/10.24297/ijct.v11i6.3039.

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Synchronization of the clocks is one of the essential thing for many applications in distributed systems. Clock synchronization is very important because they improve the performance and reliability of distributed systems. The main purpose of clock synchronization algorithms is to provide the common time to essential parts of the distributed systems. In this paper the problem considered is synchronization of clock with bounded clock drift and proposing a two level synchronization algorithm which synchronizes the processors local clocks by combining both internal and external clock synchronization.
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Robu, Andrei D., Christoph Salge, Chrystopher L. Nehaniv, and Daniel Polani. "Measuring Time with Minimal Clocks." Artificial Life 25, no. 4 (November 2019): 383–409. http://dx.doi.org/10.1162/artl_a_00303.

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Being able to measure time, whether directly or indirectly, is a significant advantage for an organism. It allows for timely reaction to regular or predicted events, reducing the pressure for fast processing of sensory input. Thus, clocks are ubiquitous in biology. In the present article, we consider minimal abstract pure clocks in different configurations and investigate their characteristic dynamics. We are especially interested in optimally time-resolving clocks. Among these, we find fundamentally diametral clock characteristics, such as oscillatory behavior for purely local time measurement or decay-based clocks measuring time periods on a scale global to the problem. We include also sets of independent clocks ( clock bags), sequential cascades of clocks, and composite clocks with controlled dependence. Clock cascades show a condensation effect, and the composite clock shows various regimes of markedly different dynamics.
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Kumar, Arun, Mireia Vaca-Dempere, Thomas Mortimer, Oleg Deryagin, Jacob G. Smith, Paul Petrus, Kevin B. Koronowski, et al. "Brain-muscle communication prevents muscle aging by maintaining daily physiology." Science 384, no. 6695 (May 3, 2024): 563–72. http://dx.doi.org/10.1126/science.adj8533.

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A molecular clock network is crucial for daily physiology and maintaining organismal health. We examined the interactions and importance of intratissue clock networks in muscle tissue maintenance. In arrhythmic mice showing premature aging, we created a basic clock module involving a central and a peripheral (muscle) clock. Reconstituting the brain-muscle clock network is sufficient to preserve fundamental daily homeostatic functions and prevent premature muscle aging. However, achieving whole muscle physiology requires contributions from other peripheral clocks. Mechanistically, the muscle peripheral clock acts as a gatekeeper, selectively suppressing detrimental signals from the central clock while integrating important muscle homeostatic functions. Our research reveals the interplay between the central and peripheral clocks in daily muscle function and underscores the impact of eating patterns on these interactions.
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Liu, Mochi, Yu Chen, Qian Xu, Yuzhuo Wang, Yuan Gao, and Aimin Zhang. "Mirror Clock: A Strategy for Identifying Atomic Clock Frequency Jumps." Sensors 22, no. 22 (November 21, 2022): 8995. http://dx.doi.org/10.3390/s22228995.

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Atomic clock frequency jumps directly influence the accuracy and reliability of timekeeping systems. The necessary corrections are typically implemented by postprocessing mutual comparison data between multiple atomic clocks based on the overly strict assumption that these atomic clocks are independent of each other. This paper describes the concept of a mirror clock, which enables atomic clock frequency jumps to be identified in real time without any assumptions. By comparing whether the real measured data and a corresponding mirror clock prediction fall within a confidence interval determined by the uncertainty of past physical clock data, atomic clock frequency jumps can be effectively identified and corrected. The results of several experiments using three hydrogen masers verify that the precision and recall of simultaneous jump identification reach 96.41% and 73.49%, respectively.
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Shakhmantsir, Iryna, and Amita Sehgal. "Splicing the Clock to Maintain and Entrain Circadian Rhythms." Journal of Biological Rhythms 34, no. 6 (August 7, 2019): 584–95. http://dx.doi.org/10.1177/0748730419868136.

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Circadian clocks drive daily rhythms of physiology and behavior in multiple organisms and synchronize these rhythms to environmental cycles of light and temperature. The basic mechanism of the clock consists of a transcription-translation feedback loop, in which key clock proteins negatively regulate their own transcription. Although much of the focus with respect to clock mechanisms has been on the regulation of transcription and on the stability and activity of clock proteins, it is clear that other regulatory processes also have to be involved to explain aspects of clock function. Here, we review the role of alternative splicing in circadian clocks. Starting with a discussion of the Drosophila clock and then extending to other major circadian model systems, we describe how the control of alternative splicing enables organisms to maintain their circadian clocks as well as to respond to environmental inputs, in particular to temperature changes.
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Harper, Ross E. F., Maite Ogueta, Peter Dayan, Ralf Stanewsky, and Joerg T. Albert. "Light Dominates Peripheral Circadian Oscillations in Drosophila melanogaster During Sensory Conflict." Journal of Biological Rhythms 32, no. 5 (September 13, 2017): 423–32. http://dx.doi.org/10.1177/0748730417724250.

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In Drosophila, as in other animals, the circadian clock is a singular entity in name and concept only. In reality, clock functions emerge from multiple processes and anatomical substrates. One distinction has conventionally been made between a central clock (in the brain) and peripheral clocks (e.g., in the gut and the eyes). Both types of clock generate robust circadian oscillations, which do not require external input. Furthermore, the phases of these oscillations remain exquisitely sensitive to specific environmental cues, such as the daily changes of light and temperature. When these cues conflict with one another, the central clock displays complex forms of sensory integration; how peripheral clocks respond to conflicting input is unclear. We therefore explored the effects of light and temperature misalignments on peripheral clocks. We show that under conflict, peripheral clocks preferentially synchronize to the light stimulus. This photic dominance requires the presence of the circadian photoreceptor, Cryptochrome.
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Markworth, Kimberly A. "Cloud Clock." Teaching Children Mathematics 24, no. 2 (October 2017): 74–77. http://dx.doi.org/10.5951/teacchilmath.24.2.0074.

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The analog clock is a rich source of tasks associated with angles and angle measures. The Cloud Clock problem is an opportunity for students to deepen their understanding of analog clocks, angles, and time and angle measurement.
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Cheng, Peng, Wenbin Shen, Xiao Sun, Chenghui Cai, Kuangchao Wu, and Ziyu Shen. "Measuring Height Difference Using Two-Way Satellite Time and Frequency Transfer." Remote Sensing 14, no. 3 (January 18, 2022): 451. http://dx.doi.org/10.3390/rs14030451.

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According to general relativity theory (GRT), the clock at a position with lower geopotential ticks slower than an identical one at a position with higher geopotential. Here, we provide a geopotential comparison using a non-transportable hydrogen clock and a transportable hydrogen clock for altitude transmission based on the two-way satellite time and frequency transfer (TWSTFT) technique. First, we set one hydrogen clock on the fifth floor and another hydrogen clock on the ground floor, with their height difference of 22.8 m measured by tape, and compared the time difference between these two clocks by TWSTFT for 13 days. Then, we set both clocks on the ground floor and compared the time difference between the two clocks for seven days for zero-baseline calibration (synchronization). Based on the measured time difference between the two clocks at different floors, we obtained the height difference 28.0 ± 5.4 m, which coincides well with the tape-measured result. This experiment provides a method of height propagation using precise clocks based on the TWSTFT technique.
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Dissertations / Theses on the topic "Clock"

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Agrenius, Gustafsson Thomas. "Testing universal Compton clocks using clock interferometry." Thesis, KTH, Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279947.

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Andersson, Göran. "Synchronized Clock." Thesis, Karlstad University, Division for Information Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1105.

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For this project I was planning to construct a clock that could be synchronized with an external source. The clock should be able to keep the time between synchronizations as these may be sparse. It also needed to be able to store the current time in a memory and keep a register of stored times. The current time and the register must be viewable by the user and the clock must also have the ability to count down the last five seconds prior to a minute selected by the user. I have performed this work at home with my own equipments.

As an external source for the synchronization I have chosen the DCF-77 clock signal broadcasted from Germany. To receive this signal I used a cheap AM receiver built specifically for this purpose. For the actual clock I used a PIC microcontroller which I programmed in C. The chip had all I needed including an oscillator and a RAM memory. I also connected a 3x16 character LCD display to the clock as well as 4 1-pole buttons for the user interface.

The program is built upon an interrupt routine that with help of an internal timer is set to execute once every hundreds of a second. During this interrupt routine all other functions are executed. These functions include a DCF decoder, an internal clock to keep the time, an LCD driver and a user interface.

I have managed to read the clock signal from the receiver but due to interferences from the computer I used to program the PIC chip, I have not been able to get any good reception close to the computer. Apart from this setback the clock works as it should and it meets all other criteria.

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Kanso, Ali A. "Clock-controlled generators." Thesis, Royal Holloway, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325033.

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Flach, Guilherme Augusto. "Clock mesh optimization." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/34773.

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Malhas de relógio são arquiteturas de rede de relógio adequadas para distribuir confiavelmente o sinal de relógio na presença de variações de processo e ambientais. Tal propriedade se torna muito importante nas tecnologias submicrônicas onde variações têm um papel importante. A confiabilidade da malha de relógio é devido aos caminhos redundantes conectando o sinal de relógio até os receptores de forma que variações afetando um caminho possam ser compensadas pelos outros caminhos. A confiabilidade vem ao custo de mais consumo de potência e fiação. Desta forma fica claro o balanceamento necessário entre distribuir confiavelmente o sinal de relógio (mais redundância) e o consumo de potência e aumento de fiação. O clock skew é definido como a diferença entre os tempos de chegada do sinal de clock nos seus receptores. Quanto maior é o clock skew, mais lento o circuito precisa operar. Além de diminuir a velocidade do circuito, um valor alto de clock skew aumenta a probabilidade de o circuito não funcionar devido às variações. Neste trabalho, nos focamos no problema de clock skew. Inicialmente extraímos informações úteis de como o comprimento da fiação e a capacitância variam a medida que o tamanho da malha varia. São apresentadas fórmulas analíticas que encontram o tamanho ótimo para ambos objetivos e é apresentado um estudo de como o clock skew varia a medida que nos afastamos do tamanho ótimo da malha de relógio. Um método para a redução de clock skew através do deslocamento dos buffers também é apresentado. Tal melhoria no clock skew não afeta o consumo de potência já que o tamanho dos buffers e a malha não são alterados.
Clock meshes are a suitable clock network architecture for reliably distributing the clock signal under process and environmental variations. This property becomes very important in the deep sub-micron technology where variations play a main role. The clock mesh reliability is due to redundant paths connecting clock buffers to clock sinks, so that variations affecting one path can be compensated by other paths. This comes at cost of more power consumption and wiring resources. Therefore it is clear the tradeoff between reliably distributing the clock signal (more redundancy) and the power and resource consumption. The clock skew is defined as the difference in the arrival time of clock signal at clock sinks. The higher is the clock skew, the slower is the circuit. Besides slowing down the circuit operation, a high clock skew increases the probability of circuit malfunction due to variations. In this work we focus on the clock skew problem. We first extract some useful information on how the clock wirelength and capacitance change as the mesh size changes. We present analytical formulas to find the optimum mesh size for both goals and study how the clock skew varies as we move further away from the optimum mesh size. We also present a method for reducing the clock mesh skew by sliding buffers from the position where they are traditionally placed. This improvement comes at no increasing cost of power consumption since the buffer size and the mesh capacitance are not changed.
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Tyumenev, Rinat. "Mercury lattice clock : from the Lamb-Dicke spectroscopy to stable clock operation." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066276/document.

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Les deux premiers chapitres de la thèse présentent le principe d’un étalon de fréquence optique et les applications qui en découlent. Les principaux avantages métrologiques de l’horloge à réseau optique de mercure sont mis en avant, et quelques rappels théoriques d’interraction matière-rayonnement appliquée à la métrologie des fréquences sont effectués. Le montage expérimental est décrit de manière générale dans le chapitre 3, en insistant particulièrement sur les différentes sources laser utilisées. Les améliorations apportées au montage durant la thèse, font l’objet du chapitre 4. La première amélioration concerne le laser de refroidissement à 254nm. Mes travaux nous ont permis d’augmenter le temps d’interrogation des atomes, étape nécessaire pour une nouvelle mesure de stabilité de l’horloge et la caractérisation des effets systématiques. Afin d’augmenter ultérieurement la stabilité, une refonte de la cavité optique qui piège les atomes dans le réseau s’est révèlée indispensable. La nouvelle cavité permet de capturer 10 fois plus d’atomes grâce à une profondeur de piégage acrue d’un facteur 3, influant directement sur le rapport signal sur bruit. Enfin, les résultats expérimentaux obtenus sont décrits dans le 5ème et dernier chapitre. La spectroscopie sur fond noir d’un échantillon de mercure polarisé en spin avec une largeur de raie record de 3.3Hz nous a permis de mesurer une stabilité de 1.2x10 -15 à une seconde, soit presque un facteur 5 mieux par rapport à notre précédente mesure. Une caractérisation de plusieurs effets systématiques sur la transitions d’horloge (shift colisionnel, effet zeeman ou encore effet de la lumière de piégage) a été menée au niveau de 10-16
The first two chapters of thesis describe the basics of optical standards and its applications. Highlight advantages of mercury as a frequency reference in optical lattice clock and give theoretical background about atom-light interaction, origins of systematic shifts and their influence on stability of a clock. The third chapter describes the experimental setup. It includes the schemes and operation of the main laser systems and their characteristics, the vacuum chamber and magneto-optical trapping of atoms. The fourth chapter is about the setup improvements that I made during the thesis. It describes the new doubling stage at 254 nm for the cooling laser system that was designed and implemented during the thesis. The new doubling stage allowed us to perform spectroscopies with long integration times necessary for the measurement of stability of our clock and systematic shifts. The second major and important improvement was the change of the lattice trap cavity. The new lattice cavity allowed us to increase trap depth by a factor of 3, number of trapped atoms by 10, improved the signal to noise ratio and increased stability of the clock. The fifth chapter tells about the obtained results. Thanks to all the technical improvements spectroscopy of the clock transition with the record linewidth of 3.3 Hz was demonstrated. State selection and spectroscopy on dark background were implemented. Stability of the clock was improved by a factor of 5 and measured to be 1.2*10-15 at 1 s. No observable collision shift and second order Zeeman shift were measured at the uncertainty level of ~1*10-16. The shift of the clock frequency due to lattice light was measured to be below 6*10-17
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RAUF, BENJAMIN. "Absolute frequency measurement of an 171Yb lattice clock and optical clock comparisons." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2708557.

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The measurement of time and frequency is at the heart of many technological applications and scientific measurements alike. In fact, the SI-unit the second is by quite a margin the SI-unit with the best relative uncertainty (ca. 10^{-16}), given by the accuracies of Cs fountain clocks probing the F = 3 - F = 4 ground-state transition in 133Cs. Still, demands for even higher accuracy and especially stability (a Cs fountain needs up to two weeks for the statistics to reach its declared uncertainty) are uttered in support of technological advancements (e.g. geodesy and GNSS systems) as well as fundamental science (physics beyond the standard model, tests of relativity). Nowadays optical lattice clocks confining a large number of neutral atoms in Stark shift free optical traps (the Stark shift free condition is characterised by a so-called magic wavelength of the trap) propose good candidates for a future redefinition of the SI-second in terms of an optical transition. Their accuracy and stability already surpass the Cs-fountains by two and three orders of magnitude, respectively. With further improvements to be expected in the near future, the application of optical lattice clocks to relativistic gravimetry, quantum computing, quantum simulation and fundamental physics keeps evolving. This thesis describes the development and characterisation of an 171Yb lattice clock at INRIM as well as its first frequency measurement campaigns and technolo- gies towards improved optical frequency measurements. The lattice clock confines cold atoms in a 1D optical dipole trap at the magic wavelength, which also cancels any Doppler- and recoil-related effects on the ultra-narrow clock transition. The first chapter offers a general overview of the physics behind lattice clocks and opti- cal frequency measurements. In the second chapter the 171Yb lattice clock developed during this work is expounded, including the trapping, state-preparation and state-probing of ultracold atoms inside the optical lattice. An exhaustive uncertainty budget for the clock transition is given and discussed showing already a performance beyond state-of- the-art Cs fountain clocks. An absolute frequency measurement obtained during this work is laid out. The result represents the lowest uncertainty achieved in a measurement of this transition against a primary frequency standard so far and is in agreement with previous values obtained by other groups around the world. A proof-of-principle experiment demonstrating for the first time the feasibility of transportable optical lattice clocks for geodesy and metrology applications outside of laboratory environments is described in chapter three. This experiment was conducted in collaboration with PTB and NPL and included a geodetic measurement with a transportable optical lattice clock that agreed with conventional methods as well as an optical 171Yb-87Sr frequency ratio measurement, enlarging the database on this particular ratio and thereby contributing to a possible redefinition of the SI-unit the second in terms of an optical transition or frequency-ratio matrix in the future. The fourth chapter discusses improvements added to the Yb lattice clock after the aforementioned measurements, in particular the stabilisation of the cooling and trapping lasers on a single stable low-drift cavity using mirrors coated for three disparate wavelengths across the optical spectrum. The simultaneous offset sideband locking and a throughout characterisation of the cavity are discussed. The last chapter is about the characterisation and optimisation of the NPL universal oscillator, which was conducted during my secondment at the NPL research facilities in the UK. The universal oscillator consists out of a femtosecond frequency comb, an ultra stable master laser and six slave oscillators. The femtosecond comb is transferring the stability of the superior master oscillator cavity to all six slave oscillators, which includes five lasers ranging from the infrared to the visible region. The principle of operation is explained and the obtained high performance of the spectral purity transfer set forth and discussed. This experiment demonstrated an unprecedented spectral purity transfer performance in a multi-branch configuration, opening the way for the interrogation of whole clock ensembles by just one master oscillator.
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Barber, Zeb. "Ytterbium optical lattice clock." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284459.

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Simpkins, Travis L. (Travis Lee) 1977. "Active optical clock distribution." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87826.

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Carbajal, Postigo Rodrigo Moisés, Dávila Natalia Ximena Caro, Saldaña Erick Alonso Jaimes, and Ramirez Patricio Pacheco. "Venta de Relojes – CLOCK." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/652746.

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El presente proyecto consiste en la construcción de un plan de emprendimiento. Este plan es diseñado para varones y mujeres entre 20 a 45 años que radican en el Perú. Clock es nuestra marca desarrollada para brindar relojes importados de China. A través de nuestras validaciones, pudimos encontrar un segmento de clientes no satisfechos con respecto a la compra de relojes elegantes a un bajo precio. En ese momento nació la idea de nuestro proyecto, comercializar relojes a todo el Perú, llegando a todas las ciudades a través de nuestros socios claves.  Tras ocho semanas de duración de este curso, se ha comprobado la viabilidad de este proyecto. Llegamos a la conclusión que el modelo de negocio presentado es rentable para los inversionistas.
The present project consists in the construction of an entrepreneurship plan. This plan is designed for men and women between 20 and 45 years old living in Peru. CLOCK is our brand developed to provide watches imported from China. Through our validations, we were able to find a segment of unsatisfied customers regarding the purchase of good quality watches at a low price.  At that time the idea of our project was born, to market watches throughout Peru, reaching all cities through our key partners. After eight hard weeks of this course, the viability of this project has been proven. We conclude that the business model presented is profitable for investors. After 8 weeks of this course, the viability of this project has been verified. We conclude that the business model presented is profitable for investors.
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Desiraju, Santosh. "High Speed Clock Glitching." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1424139368.

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Books on the topic "Clock"

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1940-, Smith Eric, ed. Clocks and clock repairing. 2nd ed. Blue Ridge Summit, PA: Tab Books, 1989.

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Slobodkina, Esphyr. The clock. [United States]: E. Slobodkina, 1987.

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Honey, Luard, Leader Darian, and White Cube (Gallery), eds. The clock. London: White Cube, 2010.

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Enterprises, Walt Disney, ed. Clock cleaners. Franklin, Tenn: Dalmatian Press, in conjunction with Disney Enterprises, 2006.

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Spilsbury, Richard. The clock. Chicago: Heinemann, 2012.

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Smith, Eric. Clocks & Clock Repairing. 2nd ed. Lutterworth Press, 2001.

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Clocks and Clock Repairing. 2nd ed. Lutterworth Press, 2005.

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Clocks and clock repairing. Lutterworth, 1988.

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Clocks, Vintage. Clocks Coloring Book: 35 Beautiful Clocks about Pocket Clock, Cuckoo Clock, Hourglasses Clock for Adult Release Stress and Relaxation. Independently Published, 2021.

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Click, clack, cluck. Sundance Pub, 2000.

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Book chapters on the topic "Clock"

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Akshay, S., Paul Gastin, R. Govind, Aniruddha R. Joshi, and B. Srivathsan. "A Unified Model for Real-Time Systems: Symbolic Techniques and Implementation." In Computer Aided Verification, 266–88. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37706-8_14.

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AbstractIn this paper, we consider a model of generalized timed automata (GTA) with two kinds of clocks, history and future, that can express many timed features succinctly, including timed automata, event-clock automata with and without diagonal constraints, and automata with timers.Our main contribution is a new simulation-based zone algorithm for checking reachability in this unified model. While such algorithms are known to exist for timed automata, and have recently been shown for event-clock automata without diagonal constraints, this is the first result that can handle event-clock automata with diagonal constraints and automata with timers. We also provide a prototype implementation for our model and show experimental results on several benchmarks. To the best of our knowledge, this is the first effective implementation not just for our unified model, but even just for automata with timers or for event-clock automata (with predicting clocks) without going through a costly translation via timed automata. Last but not least, beyond being interesting in their own right, generalized timed automata can be used for model-checking event-clock specifications over timed automata models.
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Kourtev, Ivan S., and Eby G. Friedman. "Clock Scheduling and Clock Tree Synthesis." In Timing Optimization Through Clock Skew Scheduling, 69–95. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4411-1_5.

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Levesque, Roger J. R. "Circadian Clock." In Encyclopedia of Adolescence, 421. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-1695-2_460.

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Libon, David J., Edith Kaplan, Rod Swenson, and Dana L. Penney. "Clock Drawing." In Encyclopedia of Clinical Neuropsychology, 597–600. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-0-387-79948-3_1351.

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Cameron, Neil. "Internet clock." In Electronics Projects with the ESP8266 and ESP32, 85–111. Berkeley, CA: Apress, 2020. http://dx.doi.org/10.1007/978-1-4842-6336-5_4.

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Gay, Warren. "Clock Tree." In Beginning STM32, 273–91. Berkeley, CA: Apress, 2018. http://dx.doi.org/10.1007/978-1-4842-3624-6_15.

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Libon, David J., Edith Kaplan, Rod Swenson, and Dana L. Penney. "Clock Drawing." In Encyclopedia of Clinical Neuropsychology, 1–6. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56782-2_1351-2.

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Patt-Shamir, Boaz. "Clock Synchronization." In Encyclopedia of Algorithms, 317–21. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-2864-4_72.

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Libon, David J., Edith Kaplan, Rod Swenson, and Dana L. Penney. "Clock Drawing." In Encyclopedia of Clinical Neuropsychology, 816–22. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-57111-9_1351.

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Müller, Klaus-Dieter, and Dietmar Schmunkamp. "Clock Chip." In The Design of a Microprocessor, 112–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74916-2_9.

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Conference papers on the topic "Clock"

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J, Chaithanya D., Suhas, Prathiksha H. L, Shreya R, Ramya, and Jaswanth V. "Synthesis of a Programmable Clock Management Unit Using Clock Dividers and Clock Gating using 45nm technology." In 2024 IEEE International Conference on Information Technology, Electronics and Intelligent Communication Systems (ICITEICS), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/iciteics61368.2024.10624752.

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Cui, Ziyin, Tao Zhang, Yihui Cai, Peng Cao, Ting-Jung Lin, and Lei He. "An Efficient Statistical Clock Skew Analysis Method for Clock Trees." In 2024 2nd International Symposium of Electronics Design Automation (ISEDA), 416–20. IEEE, 2024. http://dx.doi.org/10.1109/iseda62518.2024.10617702.

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Ducoing, Sage, Stav Haldar, James E. Troupe, and Ivan Agullo. "A quantum-assisted master clock in the sky – sub-nanosecond quantum clock synchronization at global scales." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/quantum.2023.qw2a.4.

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We propose a quantum-assisted network of low-SWaP satellite-based clocks forming a master clock in the sky. Synchronization amongst satellites and between satellite-ground station pairs is done through a quantum clock synchronization protocol. This pro-vides continuous sub-nanosecond to picosecond precision over global scales (better than GPS).
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Gonzalez, F., Alice Cernigliaro, Patrizia Tavella, and Juan Pablo Boyero. "Clock strategy experimentation with GIOVE clocks." In EFTF-2010 24th European Frequency and Time Forum. IEEE, 2010. http://dx.doi.org/10.1109/eftf.2010.6533641.

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Sanchez-Rola, Iskander, Igor Santos, and Davide Balzarotti. "Clock Around the Clock." In CCS '18: 2018 ACM SIGSAC Conference on Computer and Communications Security. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3243734.3243796.

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Newman, Zachary, David Carlson, Andrew Ferdinand, and Scott B. Papp. "Engineered Multi-Output Supercontinuum Generation in Tantala Waveguides for Optical-Lattice-Clock Stabilization." In CLEO: Science and Innovations. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_si.2022.sm2f.5.

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We create a tantala nanophotonic waveguide circuit to generate supercontinuum spectrum that covers all the wavelength bands required for a strontium optical-lattice clock. The phase-locked supercontinuum is a versatile tool for compact and manufacturable optical clocks.
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Sun, X., and Frederic Davidson. "Free space optical pulse position modulation communication with laser diode transmitter and avalanche photodiode receiver." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.mk6.

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A direct detection optical communication system for use in an intersatellite link was constructed with an AIGaAs laser diode (Hitach-HL8314E, λ = 833.4 nm) as the transmitter and an avalanche photodiode (RCA C30902S) as the photodetector. The system used Q = 4 pulse position modulation (PPM) signaling and operated at 25 Mbits/s. The PPM slot clock at the receiver was recovered by using a transition detector followed by a phase lock loop (PLL). The PPM word clock was recovered by using a second PLL whose input consisted of back- to-back PPM pulse pairs contained in the received random PPM pulse sequences. A special PLL circuit was devised to phase lock further the word clock with the slot clock. The use of the recovered slot and word clocks at the receiver resulted in no penalty in receiver sensitivity compared to a receiver that used common transmitter/receiver clocks. The measurements of the received bit error probabilities vs detected photons per information bit agreed well with the theoretical computation results. The system achieved a bit error probability of 10−6 at <60 detected photons per information bit (−63.5 dBm). The receiver was capable of acquiring and maintaining slot and word synchronization for received signal levels of >15 photons per information bit.
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Rintanen, Jussi. "Temporal Planning with Clock-Based SMT Encodings." In Twenty-Sixth International Joint Conference on Artificial Intelligence. California: International Joint Conferences on Artificial Intelligence Organization, 2017. http://dx.doi.org/10.24963/ijcai.2017/103.

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We propose more scalable encodings of temporal planning in SMT. The first contribution is practical clock-based encodings of resources and effect delays. Existing encodings of effect delays (Shin and Davis, 2015) have a quadratic size, due to the necessity to determine the time differences between steps for a linear number of steps. Clocks improve this to linear. The second contribution is a new relaxed scheme for steps. Existing schemes require a step for every time point with discontinuous change. This is relaxed, improving scalability.
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Lim, Aaron. "Clock." In ACM SIGGRAPH 99 Electronic art and animation catalog. New York, New York, USA: ACM Press, 1999. http://dx.doi.org/10.1145/312379.312881.

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Ostrovsky, Rafail, and Boaz Patt-Shamir. "Optimal and efficient clock synchronization under drifting clocks." In the eighteenth annual ACM symposium. New York, New York, USA: ACM Press, 1999. http://dx.doi.org/10.1145/301308.301316.

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Reports on the topic "Clock"

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Dunigan, T. Hypercube clock synchronization. Office of Scientific and Technical Information (OSTI), March 1991. http://dx.doi.org/10.2172/6389058.

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Suess, Matthias, Demetrios Matsakis, and Charles A. Greeenhall. Simulating Future GPS Clock Scenarios with Two Composite Clock Algorithms. Fort Belvoir, VA: Defense Technical Information Center, November 2010. http://dx.doi.org/10.21236/ada547035.

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Baylis, Patrick, Severin Borenstein, and Edward Rubin. When we change the clock, does the clock change us? Cambridge, MA: National Bureau of Economic Research, March 2023. http://dx.doi.org/10.3386/w30999.

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Williams, A., K. Gross, R. van Brandenburg, and H. Stokking. RTP Clock Source Signalling. RFC Editor, June 2014. http://dx.doi.org/10.17487/rfc7273.

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Frueholz, Robert P., and James C. Camparo. A Rubidium Clock Model,. Fort Belvoir, VA: Defense Technical Information Center, June 1986. http://dx.doi.org/10.21236/ada171133.

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Johnson, Carl H. Cell-permeable Circadian Clock Proteins. Fort Belvoir, VA: Defense Technical Information Center, June 2002. http://dx.doi.org/10.21236/ada405529.

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Mills, D. L. Experiments in network clock synchronization. RFC Editor, September 1985. http://dx.doi.org/10.17487/rfc0957.

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Martwick, Andrew. Clock Jitter in Communication Systems. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6259.

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Haji, M., I. Hill, E. A. Curtis, and P. Gill. Holdover atomic clock landscape review. National Physical Laboratory, August 2024. http://dx.doi.org/10.47120/npl.tqe32.

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Culwick B. B. BACKUP OF THE BOOSTER GAUSS CLOCK. Office of Scientific and Technical Information (OSTI), July 1992. http://dx.doi.org/10.2172/1150588.

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