757 research outputs found
High efficiency gaseous tracking detector for cosmic muon radiography
A tracking detector system has been constructed with an innovative approach
to the classical multi-wire proportional chamber concept, using contemporary
technologies. The detectors, covering an area of 0.58 square meters each, are
optimized for the application of muon radiography. The main features are high
(>99.5%) and uniform detection efficiency, 9 mm FWHM position resolution,
filling gas consumption below 2 liters per hour for the non toxic, non
flammable argon and carbon dioxide mixture. These parameters, along with the
simplicity of the construction and the tolerance for mechanical effects, make
the detectors to be a viable option for a large area muography observation
system.Comment: 15 pages, 15 figure
NövelhetĆ-e a csĆd-elĆrejelzĆ modellek elĆre jelzĆ kĂ©pessĂ©ge az Ășj klasszifikĂĄciĂłs mĂłdszerek nĂ©lkĂŒl?
A BĂĄzelâ2. tĆkeegyezmĂ©ny bevezetĂ©sĂ©t követĆen a bankok Ă©s hitelintĂ©zetek MagyarorszĂĄgon is megkezdtĂ©k sajĂĄt belsĆ minĆsĂtĆ rendszereik felĂ©pĂtĂ©sĂ©t, melyek karbantartĂĄsa Ă©s fejlesztĂ©se folyamatos feladat. A szerzĆ arra a kĂ©rdĂ©sre keres vĂĄlaszt, hogy lehetsĂ©ges-e a csĆd-elĆrejelzĆ modellek elĆre jelzĆ kĂ©pessĂ©gĂ©t növelnia hagyomĂĄnyos matematikai-statisztikai mĂłdszerek alkalmazĂĄsĂĄval oly mĂłdon, hogy a modellekbe a pĂ©nzĂŒgyi mutatĂłszĂĄmok idĆbeli vĂĄltozĂĄsĂĄnak mĂ©rtĂ©kĂ©t is beĂ©pĂtjĂŒk. Az empirikus kutatĂĄsi eredmĂ©nyek arra engednek következtetni, hogy a hazai vĂĄllalkozĂĄsok pĂ©nzĂŒgyi mutatĂłszĂĄmainak idĆbeli alakulĂĄsa fontos informĂĄciĂłt hordoz a vĂĄllalkozĂĄs jövĆbeli fizetĆkĂ©pessĂ©gĂ©rĆl, mivel azok felhasznĂĄlĂĄsa jelentĆsen
növeli a csĆdmodellek elĆre jelzĆ kĂ©pessĂ©gĂ©t. A szerzĆ azt is megvizsgĂĄlja, hogy javĂtja-e a megfigyelĂ©sek szĂ©lsĆsĂ©gesen magas vagy alacsony Ă©rtĂ©keinek modellezĂ©s
elĆtti korrekciĂłja a modellek klasszifikĂĄciĂłs teljesĂtmĂ©nyĂ©t.
Journal of Economic Literature (JEL) kĂłd: C52, C53, G33
Stock Ă©s flow tĂpusĂș szĂĄmviteli adatok alkalmazĂĄsa a csĆdelĆrejelzĆ modellekben
A vĂĄllalatok hitelkockĂĄzatĂĄnak megĂtĂ©lĂ©sĂ©t szolgĂĄlĂł scoring modellekben ĂĄltalĂĄnosan elterjedt a szĂĄmviteli adatok alapjĂĄn kalkulĂĄlt hĂĄnyados tĂpusĂș pĂ©nzĂŒgyi mutatĂłszĂĄmok alkalmazĂĄsa. E vĂĄltozĂłk körĂ©ben azonban vannak olyanok, amelyek mĂ©rlegtĂ©teleket (mint stock tĂpusĂș adatokat) Ă©s eredmĂ©nykimutatĂĄsbĂłl vett Ă©rtĂ©keket (mint flow tĂpusĂș adatokat) vetnek össze. Az ilyen mutatĂłk esetĂ©n a stock tĂpusĂș adatokat a nyitĂł Ă©s zĂĄrĂł Ă©rtĂ©k ĂĄtlagĂĄban szĂŒksĂ©ges figyelembe venni. Ennek ellenĂ©re a tudomĂĄnyos kutatĂĄsban Ă©s a gyakorlati modellezĂ©sben is gyakori, hogy az elemzĆk a stock tĂpusĂș adatok vonatkozĂĄsĂĄban elmulasztjĂĄk az ĂĄtlagolĂĄst. A tanulmĂĄny azt a kĂ©rdĂ©st vizsgĂĄlja, hogy e âmulasztĂĄsnakâ van-e statisztikailag mĂ©rhetĆ hatĂĄsa a modellek elĆrejelzĆ kĂ©pessĂ©gĂ©re. Az empirikus vizsgĂĄlat sorĂĄn a logisztikus regressziĂł mĂłdszerĂ©t alkalmaztam tĂzszeres keresztvalidĂĄciĂłval. A kutatĂĄs eredmĂ©nye arra utal, hogy az idĆszak vĂ©gi Ă©rtĂ©kek hasznĂĄlata az ĂĄtlagok helyett csak kis â a vizsgĂĄlt adathalmaz esetĂ©n egy szĂĄzalĂ©kpontnĂĄl kisebb â mĂ©rtĂ©kben csökkenti a modellek elĆrejelzĆ kĂ©pessĂ©gĂ©t a ROC-görbe alatti terĂŒletet hasznĂĄlva teljesĂtmĂ©nymutatĂłkĂ©nt
Instruments of Criminal Law and Forensics in Combating Organized Crime
A kutatĂĄs sorĂĄn megvizsgĂĄltam a bƱnszervezetre vonatkozĂł hatĂĄlyos bĂŒntetĆjogi szabĂĄlyozĂĄst, Ă©s javaslatot tettem, hogy a bƱnszervezet fogalmĂĄban szereplĆ elemeket a PC-S-CO ĂĄltal megfogalmazott esetleges kritĂ©riumokkal kellene kiegĂ©szĂteni. Javaslatot tettem a hatĂ©kony felderĂtĂ©s Ă©s a bizonyĂtĂĄs Ă©rdekĂ©ben egy âEgysĂ©ges NyomozĂĄsi AdatbĂĄzis FelĂŒletâ lĂ©trehozĂĄsĂĄra. A kutatĂĄsom sorĂĄn megĂĄllapĂtottam, hogy a taktikai blöff helyes alkalmazĂĄsa jelentĆs szerepet kĂ©pvisel a âdominĂłâ effektus alapjĂĄn a bƱnszervezetek elleni kĂŒzdelemben. TovĂĄbbĂĄ megĂĄllapĂtottam, hogy a befolyĂĄsolĂł kĂ©rdĂ©sek kĂĄros következmĂ©nyeit a szervezett bƱnözĂ©s elleni kĂŒzdelem sorĂĄn. A kutatĂĄs eredmĂ©nyekĂ©nt javaslatot tettem egy speciĂĄlis szervezet, a BƱnszervezetek Elleni Iroda (BELI) lĂ©trehozĂĄsĂĄra, amely mĂ©g hatĂ©konyabban lenne kĂ©pes eleget tenni a digitĂĄlis technikai fejlĆdĂ©s kihĂvĂĄsainak.
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In the research I examined the current regulations of criminal law on organized criminal groups, and made recommendations for supplementing the conceptual elements of organized crime with the possible criteria listed by the PC-S-CO. I made a proposal for establishing the âUnified Investigative Databaseâ for the sake of efficient detection and prosecution. I concluded that the appropriate application of tactical bluff plays a significant role in the fight against organized crime due to its domino effect. Furthermore, I stated that the detrimental consequences of influential questions in combating organized crime. As one of the conclusions of the research I proposed the establishment of a special organization, the Bureau of Combating Organized Crime (BELI), which could give state-of-the-art answers to the challenges posed by the development of digital technology.In the research I examined the current regulations of criminal law on organized criminal groups, and made recommendations for supplementing the conceptual elements of organized crime with the possible criteria listed by the PC-S-CO. I made a proposal for establishing the âUnified Investigative Databaseâ for the sake of efficient detection and prosecution. I concluded that the appropriate application of tactical bluff plays a significant role in the fight against organized crime due to its domino effect. Furthermore, I stated that the detrimental consequences of influential questions in combating organized crime. As one of the conclusions of the research I proposed the establishment of a special organization, the Bureau of Combating Organized Crime (BELI), which could give state-of-the-art answers to the challenges posed by the development of digital technology
NövelhetĆ-e a csĆd-elĆrejelzĆ modellek elĆre jelzĆ kĂ©pessĂ©ge az Ășj klasszifikĂĄciĂłs mĂłdszerek nĂ©lkĂŒl? (Can the predictive capacity of bankruptcy forecasting models be increased without new classification methods?)
A BĂĄzelâ2. tĆkeegyezmĂ©ny bevezetĂ©sĂ©t követĆen a bankok Ă©s hitelintĂ©zetek MagyarorszĂĄgon
is megkezdtĂ©k sajĂĄt belsĆ minĆsĂtĆ rendszereik felĂ©pĂtĂ©sĂ©t, melyek karbantartĂĄsa Ă©s fejlesztĂ©se folyamatos feladat. A szerzĆ arra a kĂ©rdĂ©sre keres vĂĄlaszt,
hogy lehetsĂ©ges-e a csĆd-elĆrejelzĆ modellek elĆre jelzĆ kĂ©pessĂ©gĂ©t növelni a hagyomĂĄnyos matematikai-statisztikai mĂłdszerek alkalmazĂĄsĂĄval oly mĂłdon,
hogy a modellekbe a pĂ©nzĂŒgyi mutatĂłszĂĄmok idĆbeli vĂĄltozĂĄsĂĄnak mĂ©rtĂ©kĂ©t is beĂ©pĂtjĂŒk. Az empirikus kutatĂĄsi eredmĂ©nyek arra engednek következtetni, hogy a hazai vĂĄllalkozĂĄsok pĂ©nzĂŒgyi mutatĂłszĂĄmainak idĆbeli alakulĂĄsa fontos informĂĄciĂłt hordoz a vĂĄllalkozĂĄs jövĆbeli fizetĆkĂ©pessĂ©gĂ©rĆl, mivel azok felhasznĂĄlĂĄsa jelentĆsen növeli a csĆdmodellek elĆre jelzĆ kĂ©pessĂ©gĂ©t. A szerzĆ azt is megvizsgĂĄlja, hogy javĂtja-e a megfigyelĂ©sek szĂ©lsĆsĂ©gesen magas vagy alacsony Ă©rtĂ©keinek modellezĂ©s
elĆtti korrekciĂłja a modellek klasszifikĂĄciĂłs teljesĂtmĂ©nyĂ©t. ______ Banks and lenders in Hungary also began, after the introduction of the Basel 2 capital agreement, to build up their internal rating systems, whose maintenance and development are a continuing task. The author explores whether it is possible to increase the predictive capacity of business-failure forecasting models by traditional mathematical-cum-statistical means in such a way that they incorporate the measure of change in the financial indicators over time. Empirical findings suggest that the temporal development of the financial indicators of firms in Hungary carries important information about future ability to pay, since the predictive capacity of bankruptcy forecasting models is greatly increased by using such indicators. The author also examines whether the classification performance of the models can be improved by correcting for extremely high or low values before modelling
MesĂ©k Ă©s fejlĆdĂ©ssegĂtĆ feladatok az 1. Ă©s a 2. osztĂĄlyos olvasĂłkönyvekben
A mesĂ©ben rejlĆ lehetĆsĂ©gek Ă©s a mesĂ©knek a 4â8 Ă©ves gyermekek Ă©letĂ©ben jĂĄtszott szerepe miatt kĂ©zenfekvĆnek tƱnik, hogy a mesĂ©k alkalmazĂĄsĂĄra Ă©pĂŒlĆ mĂłdszerekkel prĂłbĂĄljuk segĂteni a gyermekek fejlĆdĂ©sĂ©t. MĂłdszerĂŒnk kidolgozĂĄsĂĄt megalapozandĂł, szĂŒksĂ©gesnek lĂĄttuk annak megvizsgĂĄlĂĄsĂĄt is, hogy a 4â8 Ă©ves korosztĂĄly Ă©letĂ©ben, otthon, az ĂłvodĂĄban Ă©s az iskolĂĄban hogyan jelenik meg a mese. A kĂ©rdĂ©sben valĂł tĂĄjĂ©kozĂłdĂĄshoz az iskolĂĄsok esetĂ©ben az egyik legalkalmasabb lehetĆsĂ©g a tankönyvelemzĂ©s
Development and Micro Manufacturing of Coronary Stents in Hungary
Revascularisation by endovascular implant (stent) has great importance in the treatment
of coronary artery diseases. Stents are high-technology implants that are the creation of the
knowledge of health sciences, physics, chemistry, material science and engineering. Its
development can be carried out only by the involvement of these areas of knowledge. Hungary has
a stent production since 1995, which is the only one in the new EU member countries. The aim of
the project that has been started within the frameworks of the National Research and Development
Program, is the development of a new stent family based on the results of the material science
researches have started for 10 years and the clinical and production experiences of experts, which
could result an equivalent Hungarian product to the market leader products in case of several product
lines. The original wire-mesh cut for those replaced welded stents made of wire later from tubes
laser cutted ones. The stents are made of biocompatible materials: 316LVM stainless steel, Co-Cr
alloys and nitinol. Stents made from wires are produced by weaving, or reeling and resistance projection
welding. Nowadays, stents are produced mostly by high-precision laser cutting. These were
large steps forward in the development of production technology, following the appearance of
balloon catheters. Independently of what kind of manufacturing process is used, it has to be very
precise because a connecting goal of the development is to increase the biocompatibility of the
stents with surface treatment and to create a coating that is able to carry drug on the smooth surface.
The paper presents the antecedents, achievements and main future objectives in micro
manufacturing speciality of that special medical device, that is just before the surface treatment and
coating process of the stent
Development of coronary stents using advanced results of materials science and technology
Stents are high tech endovascular implants. K&M Inc. is the single Eastern European stent
producer company. The market needs more biocompatible devices as the trend of the stent
development all the producers have to react. The other members of a R&D consortium is
research institutions deals with diamond-like and drug-eluting coatings for decade. These
biocompatible coatings can avoid the metallic stent surface to directly contact to the living
tissues. This way a biologically active drug connected to the surface can be delivered directly
to the diseased vessel wall. The Cardiovascular Institution has the clinical facility to test the
new products. This group of applicants is obliged to develop, test and put on the market the
new generation biocompatible coated stents
Neuronal and astroglial correlates underlying spatiotemporal Intrinsic Optical Signal in the rat hippocampal slice
Widely used for mapping afferent activated brain areas in vivo, the label-free intrinsic optical signal (IOS) is mainly ascribed to blood volume changes subsequent to glial glutamate uptake. By contrast, IOS imaged in vitro is generally attributed to neuronal and glial cell swelling, however the relative contribution of different cell types and molecular players remained largely unknown.
We characterized IOS to Schaffer collateral stimulation in the rat hippocampal slice using a 464-element photodiode-array device that enables IOS monitoring at 0.6 ms time-resolution in combination with simultaneous field potential recordings. We used brief half-maximal stimuli by applying a medium intensity 50 Volt-stimulus train within 50 ms (20 Hz). IOS was primarily observed in the str. pyramidale and proximal region of the str. radiatum of the hippocampus. It was eliminated by tetrodotoxin blockade of voltage-gated Na+ channels and was significantly enhanced by suppressing inhibitory signaling with gamma-aminobutyric acid(A) receptor antagonist picrotoxin. We found that IOS was predominantly initiated by postsynaptic Glu receptor activation and progressed by the activation of astroglial Glu transporters and Mg2+-independent astroglial N-methyl-D-aspartate receptors. Under control conditions, role for neuronal K+/Cl- cotransporter KCC2, but not for glial Na+/K+/Cl- cotransporter NKCC1 was observed. Slight enhancement and inhibition of IOS through non-specific Cl- and volume-regulated anion channels, respectively, were also depicted.
High-frequency IOS imaging, evoked by brief afferent stimulation in brain slices provide a new paradigm for studying mechanisms underlying IOS genesis. Major players disclosed this way imply that spatiotemporal IOS reflects glutamatergic neuronal activation and astroglial response, as observed within the hippocampus. Our model may help to better interpret in vivo IOS and support diagnosis in the future
Dinamikus pĂ©nzĂŒgyi mutatĂłszĂĄmok alkalmazĂĄsa a csĆdelĆrejelzĂ©sben = Application of dynamic financial variables in bankruptcy prediction
A csĆdelĆrejelzĆ modellek a vĂĄllalkozĂĄsok jövĆbeli fizetĆkĂ©pessĂ©gĂ©t prĂłbĂĄljĂĄk elĆrejelezni objektĂv informĂĄciĂłk alapjĂĄn statisztikai (adatbĂĄnyĂĄszati) mĂłdszerek felhasznĂĄlĂĄsĂĄval. E modellek jellemzĆen a vĂĄllalatok pĂ©nzĂŒgyi kimutatĂĄsaibĂłl (mĂ©rleg, eredmĂ©nykimutatĂĄs) szĂĄmĂthatĂł hĂĄnyados tĂpusĂș pĂ©nzĂŒgyi mutatĂłszĂĄmokat hasznĂĄljĂĄk magyarĂĄzĂł vĂĄltozĂłkĂ©nt.
A tudomĂĄnyterĂŒlet kutatĂĄsa közel 50 Ă©ves mĂșltra tekint vissza. Ennek ellenĂ©re szĂĄmos nyitott kutatĂĄsi kĂ©rdĂ©s talĂĄlhatĂł a szakirodalomban, melynek köszönhetĆen folyamatos az Ă©rdeklĆdĂ©s a tĂ©makör irĂĄnt. E kĂ©rdĂ©sek közĂŒl az egyik legrĂ©gebben ismert problĂ©ma a csĆdelĆrejelzĆ modellek statikus jellegĂ©bĆl adĂłdik. Ennek lĂ©nyege, hogy a modellek magyarĂĄzĂł vĂĄltozĂłi közt csak legaktuĂĄlisabb adatokat hasznĂĄljĂĄk fel Ă©s figyelmen kĂvĂŒl hagyjĂĄk a pĂ©nzĂŒgyi mutatĂłszĂĄmok idĆbeli trendjĂ©bĆl kinyerhetĆ informĂĄciĂłkat. A problĂ©ma megoldĂĄsĂĄra fĆkĂ©nt bonyolultabb mĂłdszertani megoldĂĄsok szĂŒlettek, melyek â vĂ©lhetĆen komplexitĂĄsuk miatt â nem terjedtek el ĂĄltalĂĄnosan az ĂgĂ©retes eredmĂ©nyek ellenĂ©re sem.
ĂrtekezĂ©semben arra törekedtem, hogy a modellek dinamizĂĄlĂĄsĂĄt bonyolultabb mĂłdszertani megoldĂĄsok nĂ©lkĂŒl valĂłsĂtsam meg. Erre a cĂ©lra egy olyan mutatĂłszĂĄmot javasoltam, amely lehetĆvĂ© teszi a pĂ©nzĂŒgyi mutatĂłk idĆbeli tendenciĂĄjĂĄnak figyelembe vĂ©telĂ©t a szakirodalomban Ă©s a gyakorlati modellezĂ©sben ĂĄltalĂĄnosan elterjedt âhagyomĂĄnyosâ mĂłdszerek keretei közt. E mutatĂłszĂĄm azt tĂŒkrözi, hogyan viszonyul egy Ă©rintett vĂĄllalkozĂĄs legaktuĂĄlisabb pĂ©nzĂŒgyi mutatĂłja az adott vĂĄllalkozĂĄs azonos mutatĂłjĂĄnak korĂĄbbi Ă©vekben megfigyelt Ă©rtĂ©keihez
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