Stochasticity and coherent structures in ultra-long mode-locked lasers

Ultra-long mode-locked lasers are known to be strongly influenced by nonlinear interactions in long cavities that results in noise-like stochastic pulses. Here, by using an advanced technique of real-time measurements of both temporal and spatial (over round-trips) intensity evolution, we reveal an existence of wide range of generation regimes. Different kinds of coherent structures including dark and grey solitons and rogue-like bright coherent structures are observed as well as interaction between them are revealed.

Stochasticity, periodicity and localized light structures in partially mode-locked fibre lasers

Physical systems with co-existence and interplay of processes featuring distinct spatio-temporal scales are found in various research areas ranging from studies of brain activity to astrophysics. The complexity of such systems makes their theoretical and experimental analysis technically and conceptually challenging. Here, we discovered that while radiation of partially mode-locked fibre lasers is stochastic and intermittent on a short time scale, it exhibits non-trivial periodicity and long-scale correlations over slow evolution from one round-trip to another. A new technique for evolution mapping of intensity autocorrelation function has enabled us to reveal a variety of localized spatio-temporal structures and to experimentally study their symbiotic co-existence with stochastic radiation. Real-time characterization of dynamical spatio-temporal regimes of laser operation is set to bring new insights into rich underlying nonlinear physics of practical active- and passive-cavity photonic systems.

Femtosecond laser microfabrication of subwavelength structures in photonics

This paper describes experimental and numerical results of the plasma-assisted microfabrication of subwavelength structures by means of point-by point femtosecond laser inscription. It is shown that the spatio-temporal evolution of light and plasma patterns critically depend on input power. Subwavelength inscription corresponds to the supercritical propagation regimes when pulse power is several times self-focusing threshold. Experimental and numerical profiles show quantitative agreement.

Global trends in myopia management attitudes and strategies in clinical practice

PURPOSE: Myopia is a global public health issue; however, no information exists as to how potential myopia retardation strategies are being adopted globally. METHODS: A self-administrated, internet-based questionnaire was distributed in six languages, through professional bodies to eye care practitioners globally. The questions examined: awareness of increasing myopia prevalence, perceived efficacy and adoption of available strategies, and reasons for not adopting specific strategies. RESULTS: Of the 971 respondents, concern was higher (median 9/10) in Asia than in any other continent (7/10, p<0.001) and they considered themselves more active in implementing myopia control strategies (8/10) than Australasia and Europe (7/10), with North (4/10) and South America (5/10) being least proactive (p<0.001). Orthokeratology was perceived to be the most effective method of myopia control, followed by increased time outdoors and pharmaceutical approaches, with under-correction and single vision spectacles felt to be the least effective (p<0.05). Although significant intra-regional differences existed, overall most practitioners 67.5 (±37.8)% prescribed single vision spectacles or contact lenses as the primary mode of correction for myopic patients. The main justifications for their reluctance to prescribe alternatives to single vision refractive corrections were increased cost (35.6%), inadequate information (33.3%) and the unpredictability of outcomes (28.2%). CONCLUSIONS: Regardless of practitioners' awareness of the efficacy of myopia control techniques, the vast majority still prescribe single vision interventions to young myopes. In view of the increasing prevalence of myopia and existing evidence for interventions to slow myopia progression, clear guidelines for myopia management need to be established.

Discovering knowledge structures in mind maps of mental health risks

This thesis addressed the problem of risk analysis in mental healthcare, with respect to the GRiST project at Aston University. That project provides a risk-screening tool based on the knowledge of 46 experts, captured as mind maps that describe relationships between risks and patterns of behavioural cues. Mind mapping, though, fails to impose control over content, and is not considered to formally represent knowledge. In contrast, this thesis treated GRiSTs mind maps as a rich knowledge base in need of refinement; that process drew on existing techniques for designing databases and knowledge bases. Identifying well-defined mind map concepts, though, was hindered by spelling mistakes, and by ambiguity and lack of coverage in the tools used for researching words. A novel use of the Edit Distance overcame those problems, by assessing similarities between mind map texts, and between spelling mistakes and suggested corrections. That algorithm further identified stems, the shortest text string found in related word-forms. As opposed to existing approaches’ reliance on built-in linguistic knowledge, this thesis devised a novel, more flexible text-based technique. An additional tool, Correspondence Analysis, found patterns in word usage that allowed machines to determine likely intended meanings for ambiguous words. Correspondence Analysis further produced clusters of related concepts, which in turn drove the automatic generation of novel mind maps. Such maps underpinned adjuncts to the mind mapping software used by GRiST; one such new facility generated novel mind maps, to reflect the collected expert knowledge on any specified concept. Mind maps from GRiST are stored as XML, which suggested storing them in an XML database. In fact, the entire approach here is ”XML-centric”, in that all stages rely on XML as far as possible. A XML-based query language allows user to retrieve information from the mind map knowledge base. The approach, it was concluded, will prove valuable to mind mapping in general, and to detecting patterns in any type of digital information.

Teljesítménymérés és döntéstámogatás az üzleti szférában = Performance measurement and decision support in business practice

Tanulmányunkban a hazai vállalatok teljesítménymérési és teljesítménymenedzsment gyakorlatát vizsgáljuk a Versenyben a világgal kutatási program adatainak felhasználásával. Célunk a döntéstámogatás hátterének vizsgálata: a vállalatok teljesítménymérési gyakorlatának jellemzése, konzisztenciájának értékelése, vizsgálva a korábbi kutatásaink során megfigyelt tendenciák további alakulását is. A vállalatvezetők által fontosnak/hasznosnak tartott, illetve rendszeresen használt információforrásokat, teljesítménymutatókat, elemzési eszközöket a korábbi kutatásainkhoz kialakított elemzési keret (orientáció, egyensúly, konzisztencia, támogató szerep) felhasználásával értékeltük. Az információs rendszer különböző tevékenységeket támogató szerepének az értékelése során a különböző területekért felelős vezetők véleményét is összevetettük, s különböző vállalatcsoportok sajátosságait is vizsgáltuk. --------- The paper analyses the performance measurement and performance management practice of Hungarian companies, based on data of the Competitiveness research program. Our goal was to evaluate the practice from the point of view of decision support, based on our previous framework, evaluating the orientation, the balance, the consistency and the supporting role of the performance measurement practice.

Financial crisis and the change in the practice of applying common charge costs

The global financial crisis has not left the members of the EU untouched. Financial results have significantly dropped, businesses were folded in great numbers, the rate of employment decreased, social tension got fortified, and so did the national deficits in the budget in the majority of the countries. The decisive members of the community reacted fairly quickly to the challenges of the global economic crisis, and among the steps taken there were simultaneously ones to boost the economy and others to lower the expenses of the expenditure. The author examines what role was given to the steps in taxation policy as indirect regulating tools, and that how the decisions brought touch upon the previously issued harmonization strategy.

A gazdasági teljesítmények vállalkozási mérettől függő jellemzői Magyarországon = Changing ownership and business structures in the Hungarian economy

A mögöttünk hagyott két évtizedben – tetszik, vagy sem – a magyar gazdaság 1992. évi mélypontról történő kilábalásában, majd új növekedési pályára állásában meghatározó szerepe volt a hazai forrásokat kiegészítő külföldi befektetéseknek. Ennek természetesen ára volt: a tevékenységi struktúra (termékszerkezet) módosulása, a tulajdonosi összetétel radikális átalakulása, a külgazdasági kapcsolatok irányultságának változása, a lakosság önfoglalkoztatási célú vállalkozásainak szaporodása, a gazdaságfejlesztés irányának és ütemének cikk-cakkos mozgása, az állami szerepkör fokozatos leépülése. Írásunk célja annak áttekintése, hogy a nemzetközi tőkeáramlás tendenciáinak módosulását követően – a Magyarországra érkező külföldi tőkebefektetések jelentős csökkenéséből fakadóan – a kizárólagos és többségi hazai tulajdonú szereplők (kiemelten a hazai közép- és kisvállalkozások) milyen mértékben lehetnek alkalmasak a kieső teljesítmények pótlására, illetve a gazdasági válság lecsengését követően milyen ütemű növekedést képesek biztosítani a magyar gazdaság számára. A válaszok nagy valószínűséggel az Új Széchenyi Terv szempontjából sem közömbösek. Az írást a szerkesztőség vitairatnak szánja és szívesen ad teret a témával kapcsolatos vélemények kifejtésének. / === / The economic performance during the transition period was characterized by the alternations of fulfilled hopes and unrealized expectations. The economic restructuring and changes in market relations took place during the first decade, while new – mostly foreign – investment groups entered the new market. As a result the economy was stabilized and was put on a new growth path. But after the millennium the foreign investment based economy development strategy was no more adequate. The new engine for the growth should have been the domestic small and medium enterprise sector (SME), but despite the subsidies this sector was not strengthened enough to take this role.

A lean menedzsment és a leadership jellemzők kapcsolata a hazai vállalati gyakorlatban (Lean management and leadership attributes in the practice of Hungarian firms)

A nemzetközi szakirodalom a vezetőt a lean termelés bevezetésében és fenntartásában is kulcsszereplőként határozza meg. Ennek ellenére nagyon kevés empirikus elemzés vizsgálja a vezetőkkel kapcsolatos kérdéseket. A szerzők a kontingencialista leadership elmélet keretei között a lean termelési rendszer és a vezetési jellemzők kapcsolatát vizsgálják elméleti szempontból és empirikusan egyaránt. Bár a kérdés nem került korábbi munkák fókuszába, az elméleti és empirikus megfontolások alapján egyaránt megállapítható, hogy több vezetési jellemző is szorosan kapcsolható egy jól működő lean termelővállalat vezetőjéhez. Követendő vezetési jellemzőként jelenik meg többek között az együttműködő, a delegáló, a teljesítményorientált vagy fejlődésorientált. Azonosíthatók olyan jellemzők is, amelyek elméletileg nem egyeztethetők össze a lean termelési rendszer logikájával, pl. autokrata, diktatórikus vagy mikrovezető ______ The working paper focuses on two connected research questions: on one hand based on widely accepted literature it systematically maps the ideal leadership style and related leader attributes that help in transforming a company into a real and well-functioning lean organization. On the other hand the paper analyzes whether leaders of companies with more developed lean practice do or do not follow these leadership attributes recommended by literature. The study uses the fourth round of the Hungarian Competitiveness Research Survey from 2009. This study is limited to the analysis of questionnaires filled in by producers that have more than 50 employees (about 65 manufacturing firms). The authors analyze the leadership styles of two managers, namely the CEO and production manager. Results of the empirical analysis revealed astonishing and contradictory attitudes toward ideal leadership attributes of leaders operating in more developed lean companies.

Fenntarthatóság a hazai vállalati gyakorlatban – A „Versenyben a világgal” kutatási program 2009. évi kérdőíves felmérés eredményeinek vizsgálata (Sustainability in the practice of Hungarian firms)

A fenntarthatóság kérdésköre napjainkban egyre inkább a figyelem középpontjába kerül. Egyes szerzők egyenesen a következő, a minőségi és az információs forradalomhoz hasonló megatrendnek tartják a fenntarthatóságot (Lubin – Esty, 2010). A tanulmány célja megvizsgálni, mennyiben érvényesül ez a megatrend Magyarországon: mennyiben kezelik stratégiai, versenyképességi kérdésként a magyar vállalatok a környezetvédelmet és a fenntarthatóságot? A szerző tanulmányában bemutatja a fenntartható fejlődés vállalati vonatkozásait, majd megvizsgálja, mennyiben jelennek meg a hazai vállalatok stratégiájában és gyakorlatában a fenntarthatóság aspektusai. Az elemzéshez a Budapesti Corvinus Egyetem Versenyképesség Kutató Központjában 2009-ben lebonyolított kérdőíves felmérés adatait használta fel. _______ Sustainability has been receiving an ever increasing attention in recent years. Some authors even cite sustainability as the next megatrend after quality and IT revolutions (Lubin–Esty, 2010). This paper aims to examine to what extent this megatrend prevails in Hungary: do Hungarian companies treat environmental protection and sustainability as a strategic element of competitiveness? The paper studies the concept of corporate sustainability, then examines the presence of the three aspects of sustainability in the strategy and practice of Hungarian firms. The analysis is based on the results of a survey on competitiveness carried out by the Competitiveness Research Centre of Corvinus University of Budapest in 2009.

Changes in tax structures in European Union Member States

The European Union does not have a comprehensive common tax policy and substantial changes in this specialized policy area are not likely in the foreseeable future. Albeit common rules, requirements, minimum rates for certain tax types were implemented in the last few decades, they barely limit the Member States in using their tax policies as one of the worthiest elements of their arsenal in increasing competitiveness or quite the contrary, to undermining their own international competitiveness inadvertently through a misguided tax policy. In this article, we put the tax policies of the Visegrad Group and the Eurozone core countries (Germany, Austria and the Netherlands), as well as changes in these policies under the magnifying glass, in terms of the impact of tax structure changes on economic growth and employment in the last decade.