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C-motivic modular forms [article]

Bogdan Gheorghe, Daniel C. Isaksen, Achim Krause, Nicolas Ricka
2018 arXiv   pre-print
We construct a topological model for cellular, 2-complete, stable C-motivic homotopy theory that uses no algebro-geometric foundations. We compute the Steenrod algebra in this context, and we construct a "motivic modular forms" spectrum over C.
arXiv:1810.11050v1 fatcat:izuii2ezjbex3d4eae44gja4ee


2018 Scientific Journal of Cahul "Bogdan Petriceicu Hasdeu" State University: Economic & Engineering Studies  
This paper reflects the development results of the irrigation processes automating platform for the plantations, which can be very user-friendly to optimize these processes and minimize irrigation costs and therefore serves as a means to become more competitive on the market. It have been carried out the automation of plantation's irrigation process: three irrigation scheduling and control modalities have been proposed and software testing has been carried out to ensure the high reliability of
more » ... igh reliability of the information and command system and its efficiency with a series of applications for the irrigation monitoring system, which allows the final user to make the necessary totals and decisions.
doaj:76bdaf968eaf4fd79af98c9b53c2f0f5 fatcat:tp4g7tgk4nhdtkypazoz3ebydm

Anomalous delta-type electric and magnetic two-nucleon interactions [article]

Nicolae Bogdan Mandache
2009 arXiv   pre-print
Anomalous delta-type interactions, of both electric and magnetic nature, are introduced between the overlapping peripheral structures of the nucleons, which may explain the spin-triplet deuteron state and the absence of other nucleon-nucleon bound states.
arXiv:0904.1080v1 fatcat:ux5f2r4nuveg3aiqtpevb4x6iq

The Picard group of motivic A(1) [article]

Bogdan Gheorghe, Daniel C. Isaksen, Nicolas Ricka
2016 arXiv   pre-print
We show that the Picard group Pic(A(1)) of the stable category of modules over C-motivic A(1) is isomorphic to Z^4. By comparison, the Picard group of classical A(1) is Z^2 ⊕Z/2. One extra copy of Z arises from the motivic bigrading. The joker is a well-known exotic element of order 2 in the Picard group of classical A(1). The C-motivic joker has infinite order.
arXiv:1606.05191v1 fatcat:dhyb7m24d5cf3jzctvmebgt7cy

Towards Aggregated Asynchronous Checkpointing [article]

Mikaila J. Gossman, Bogdan Nicolae, Jon C. Calhoun, Franck Cappello, Melissa C. Smith
2021 arXiv   pre-print
Gossman Bogdan Nicolae Jon C.  ...  Nicolae, Adam Moody, Gregory Kosinovsky, Kathryn Mohror, and Franck [1] Dulcardo Arteaga and Ming Zhao. 2011.  ... 
arXiv:2112.02289v1 fatcat:z6cdz46x6rf3vhg3ru5xruwtsi

Highlighted Steps of the Management Algorithm in Acute Lower Gastrointestinal Bleeding - Case Reports and Literature Review

Gabriel Nicolae Andrei, Bogdan Popa, Laurentiu Gulie, Bogdan Ionut Diaconescu, Bogdan Valeriu Martian, Mircea Bejenaru, Mircea Beuran, -
2016 Chirurgia  
Acute lower gastrointestinal bleeding is a major problem worldwide, being a rare and life threatening condition, with a mortality rate situated between 2 and 4%. Acute lower gastrointestinal bleeding is solvent for 1 - 2% of the entire hospital emergencies, 15% presenting as massive bleeding and up to 5% requiring surgery. Lower gastrointestinal bleeding can be classified depending on their location in the small or large intestine. The small bowel is the rarest site of lower gastrointestinal
more » ... gastrointestinal bleeding, at the same time being the commonest cause of obscure bleeding. 5% of total lower GI bleeding appears in the small bowel. When endoscopic therapy associated with medical treatment are insufficient, endovascular intervention can be lifesaving. Unfortunately in some rare cases of acute lower gastrointestinal bleeding with hemo-dynamic instability and the angiography performed being unable to locate the source of bleeding, the last therapeutic resource remains surgery. In the following we exemplify two cases of acute lower gastrointestinal bleeding which were resolved in different ways, followed by a thorough description of the different types of available treatment and finally, in the conclusions, we systematize the most important stages of the management algorithm in acute lower gastrointestinal bleeding.
pmid:26988545 fatcat:vsdd7yx4azbphlbd546jk3kgoq

Feedback Control for Online Training of Neural Networks [article]

Zilong Zhao, Sophie Cerf, Bogdan Robu, Nicolas Marchand
2019 arXiv   pre-print
Convolutional neural networks (CNNs) are commonly used for image classification tasks, raising the challenge of their application on data flows. During their training, adaptation is often performed by tuning the learning rate. Usual learning rate strategies are time-based i.e. monotonously decreasing. In this paper, we advocate switching to a performance-based adaptation, in order to improve the learning efficiency. We present E (Exponential)/PD (Proportional Derivative)-Control, a conditional
more » ... rol, a conditional learning rate strategy that combines a feedback PD controller based on the CNN loss function, with an exponential control signal to smartly boost the learning and adapt the PD parameters. Stability proof is provided as well as an experimental evaluation using two state of the art image datasets (CIFAR-10 and Fashion-MNIST). Results show better performances than the related works (faster network accuracy growth reaching higher levels) and robustness of the E/PD-Control regarding its parametrization.
arXiv:1911.07710v1 fatcat:owwebgniuzcnhjtmkb767h3naq


George Octavian NICOLAE, Sebastian Bogdan GAVRILĂ
2017 Challenges of the Knowledge Society  Judge at First Instance Court Bucharest. 1 Nicolae Volonciu, Andreea Simona Uzlau, Noul Cod de procedura penala, Bucuresti, Editura Hamangiu, 2014, p. 765.  ...  The new Procedural Code thus establishes the obligation of the prosecution to be initiated only  PhD Candidate, Faculty of Law, "Nicolae Titulescu" University of Bucharest; Judge (e-mail: nicolae.georgeoctavian  ... 
doaj:b286b011fd064fcebdc036b98e6dd438 fatcat:7ghgamtusfdphhucwthbfv574i

Adverse Selection and Re-Trade

Nicolae Bogdan Garleanu, Lasse Heje Pedersen
2002 Social Science Research Network  
An important feature of financial markets is that securities are traded repeatedly by asymmetrically informed investors. We study how current and future adverse selection affect the required return. We find that the bid-ask spread generated by adverse selection is not a cost, on average, for agents who trade, and hence the bid-ask spread does not directly influence the required return. Adverse selection contributes to trading-decision distortions, however, implying allocation costs, which
more » ... costs, which affect the required return. We explicitly derive the effect of adverse selection on required returns, and show how our result differs from models that consider the bid-ask spread to be an exogenous cost. * We thank
doi:10.2139/ssrn.302025 fatcat:zdutd23nibesniy23eqp3mc2he


George-Bogdan TOFAN, Adrian NIŢĂ, Bogdan-Nicolae PĂCURAR
2016 Analele Universităţii din Oradea: Seria Geografie  
The study at hand aims to present the gender and age structure of the population of Harghita County, recorded at the 2011 Census. For better emphasis, following geographical logic, we shall commence by bringing forward the essential characteristics of gender structure, more exactly both genders (BG), followed by the male population (M) and the female population (F), as well as age groups, encompassing the 0-19 group (young people), 20-59 group (adult) and the over 60 group (elderly). The data
more » ... lderly). The data is first presented at the larger territorial level, then the analysis shifts focus towards the evolution of each administrativeterritorial unit's population, as well as the urban-rural situation.
doaj:9d0bb87f58d9479bb3cf1c2d5a63b0ab fatcat:42favpfni5bkljmi4txhxw5wzq

Demand-Based Option Pricing

Nicolae Bogdan Garleanu, Lasse Heje Pedersen, Allen M. Poteshman
2005 Social Science Research Network  
We model demand-pressure effects on option prices. The model shows that demand pressure in one option contract increases its price by an amount proportional to the variance of the unhedgeable part of the option. Similarly, the demand pressure increases the price of any other option by an amount proportional to the covariance of the unhedgeable parts of the two options. Empirically, we identify aggregate positions of dealers and end-users using a unique dataset, and show that demand-pressure
more » ... demand-pressure effects make a contribution to wellknown option-pricing puzzles. Indeed, time-series tests show that demand helps explain the overall expensiveness and skew patterns of index options, and cross-sectional tests show that demand impacts the expensiveness of single-stock options as well.
doi:10.2139/ssrn.676501 fatcat:mkwckfz77vfi7l6oa3valaiyq4

Technological Growth and Asset Pricing

Nicolae Bogdan Garleanu, Stavros Panageas, Jianfeng Yu
2009 Social Science Research Network  
In this paper we study the implications of general-purpose technological growth for asset prices. The model features two types of shocks: "small", frequent, and disembodied shocks to productivity and "large" technological innovations, which are embodied into new vintages of the capital stock. While the former affect the economy on impact, the latter affect the economy with lags, since firms need to first adopt the new technologies through investment. The process of adoption leads to cycles in
more » ... eads to cycles in asset valuations and risk premia as firms convert the growth options associated with the new technologies into assets in place. This process can help provide a unified, investment-based view of some well documented phenomena such as the asset-valuation patterns around major technological innovations, the countercyclical behavior of returns, the lead-lag relationship between the stock market and output, and the increasing patterns of consumption-return correlations over longer horizons.
doi:10.2139/ssrn.949857 fatcat:zr6vdtk4j5go7mkhegixaocly4

Rewriting XPath Queries using View Intersections: Tractability versus Completeness [article]

Bogdan Cautis, Alin Deutsch, Ioana Ileana, Nicola Onose
2013 arXiv   pre-print
The standard approach for optimization of XPath queries by rewriting using views techniques consists in navigating inside a view's output, thus allowing the usage of only one view in the rewritten query. Algorithms for richer classes of XPath rewritings, using intersection or joins on node identifiers, have been proposed, but they either lack completeness guarantees, or require additional information about the data. We identify the tightest restrictions under which an XPath can be rewritten in
more » ... an be rewritten in polynomial time using an intersection of views and propose an algorithm that works for any documents or type of identifiers. As a side-effect, we analyze the complexity of the related problem of deciding if an XPath with intersection can be equivalently rewritten as one without intersection or union. We extend our formal study of the view-based rewriting problem for XPath by describing also (i) algorithms for more complex rewrite plans, with no limitations on the number of intersection and navigation steps inside view outputs they employ, and (ii) adaptations of our techniques to deal with XML documents without persistent node Ids, in the presence of XML keys. Complementing our computational complexity study, we describe a proof-of-concept implementation of our techniques and possible choices that may speed up execution in practice, regarding how rewrite plans are built, tested and executed. We also give a thorough experimental evaluation of these techniques, focusing on scalability and the running time improvements achieved by the execution of view-based plans.
arXiv:1308.5585v1 fatcat:oee3njgjzzhwnbuw6a6tce6cqq

Distributed Management of Massive Data: an Efficient Fine-Grain Data Access Scheme [article]

Bogdan Nicolae
2008 arXiv   pre-print
This paper addresses the problem of efficiently storing and accessing massive data blocks in a large-scale distributed environment, while providing efficient fine-grain access to data subsets. This issue is crucial in the context of applications in the field of databases, data mining and multimedia. We propose a data sharing service based on distributed, RAM-based storage of data, while leveraging a DHT-based, natively parallel metadata management scheme. As opposed to the most commonly used
more » ... st commonly used grid storage infrastructures that provide mechanisms for explicit data localization and transfer, we provide a transparent access model, where data are accessed through global identifiers. Our proposal has been validated through a prototype implementation whose preliminary evaluation provides promising results.
arXiv:0810.2227v1 fatcat:3eeiy3b3yfbc3hd4h7wgv7rstu

Design and Renegotiation of Debt Covenants

Nicolae Bogdan Garleanu, Jeffrey H. Zwiebel
2004 Social Science Research Network  
We analyze the design and renegotiation of covenants in debt contracts as a particular example of the contractual assignment of property rights under asymmetric information. In particular, we consider a setting where future firm investments are efficient in some states, but also involve a transfer from the lender(s) to shareholders. While there is symmetric information regarding investment efficiency, managers are better informed about any potential transfer than the lender. The lender can
more » ... The lender can learn this information, but at a cost. In this setting, we show that the simple adverse selection problem leads to the allocation of greater ex-ante decision rights to the uninformed party than would follow under symmetric (in particular, full) information. Consequently, ex-post renegotiation is in turn biased towards the uninformed party giving up these excessive rights. In many settings, this result yields the opposite implication from standard Property Rights results regarding contracting under incomplete contracts and ex-ante investments, whereby rights should be allocated to minimize inefficiencies due to distortions in ex-ante investments. Indeed, for debt contracts as well as other settings, the uninformed party, who receives strong decision rights in our setting, is likely to have few significant ex-ante investments to undertake relative to the informed party.
doi:10.2139/ssrn.470780 fatcat:gd4k4jf7bfhthefrpekizi7gbq
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