32 research outputs found
Detecting semantically related concepts in a SOA integration scenario
In this paper, we present an approach to detecting semantically related
concepts in a service oriented environment. This method is essential when
creating collaborative business processes. Standard enterprise application
systems such as enterprise resource planning (ERP), customer relationship
management (CRM), supply chain management (SCM) etc. offer a lot of
opportunities for application interoperability. System integrators assign a
set of services from various application systems to the integration
scenario. A well defined discovery process can detect these services.
Nevertheless, building an operable business process requires the mapping of
these services in the data schema used in the business process. This mapping
results in a global understanding of relevant business concepts in the
integration scenario. This paper focuses on the identification of
semantically relevant concepts in different schemas in the participating
services. A short overview of our integration platform and methodology is
also included
SOA based web service adaptation in enterprise application integration
Enterprise Application Integration (EAI) is a permanent need since various information systems are employed at companies. Numerous standard systems must be aligned to new business processes. There are participant systems older than 10 years, and others developed only 1-2 years ago. This implicates a wide technological variance making the integration problem a real challenging issue. The widespread of the Service Oriented Architecture (SOA) seems to be one of the most promising approaches in EAI. Although this is already supported by solid technology and tools, deploying executable processes, predicting and optimizing their non-functional performance is still an open issue. In this paper we propose a technological solution for the adaptation of standard enterprise services into SOA integration scenarios providing support for applying data transformation to bridge data incompatibilities. To evaluate our approach three other possible solutions are designed and implemented. An in detailed analytic and experimenta
l comparison of the approaches is also presented
Elektronikai gyártástechnológiákban alkalmazott stencilnyomtatás optimalizálási és modellezési aspektusai
Az elektronikai eszközök automatizált gyártásának legelterjedtebb technolĂłgia az Ăşn. ĂşjraömlesztĂ©ses forrasztás, melynek az egyik legkritikusabb lĂ©pĂ©se a stencilnyomtatás; a forrasztási hibák akár 60%-a erre a folyamatra vezethetĹ‘ vissza. Jelen cikk cĂ©lja, hogy bemutassa ezen folyamat optimalizálási Ă©s modellezĂ©si lehetĹ‘sĂ©geit irodalmi forrásokra alapozva. Az optimalizálási metĂłdusok közĂĽl a rĂ©gebbi források a DMAIC (Define, Measure, Analyze, Improve and Control) vagy Taguchi illetve RSM (response surface methodology – válaszfĂĽggvĂ©nyre illesztett felĂĽlet) mĂłdszereket alkalmazták a stencilnyomtatási folyamat tekintetĂ©ben, mely kutatások eredmĂ©nyeit a 2. fejezet mutatja be. A 3. 4. fejezet a stencilnyomtatás modellezĂ©si lehetĹ‘sĂ©geit ismerteti, valamint ahhoz kapcsolĂłdĂłan a forraszpaszták reolĂłgiai tulajdonságait leĂrĂł anyagmodelleket. VĂ©gezetĂĽl az 5. fejezet ismerteti a stencilnyomtatási folyamat legĂşjabb modellezĂ©si Ă©s optimalizálási lehetĹ‘sĂ©geit gĂ©pi tanulási mĂłdszerek alkalmazásával. Az Ăşn. „zero-defect”, nulla-hibás gyártás elĂ©rĂ©sĂ©hez elengedhetetlen a gyártási folyamatokhoz kapcsolĂłdĂł optimalizáciĂłs mĂłdszerek folyamatos vizsgálata, elemzĂ©se, ehhez kĂván a jelen cikk hozzájárulni
Gépi tanulási módszerek optimalizálása a stencilnyomtatási folyamat vizsgálatára
Jelen cikk cĂ©lja, hogy bemutassa az ĂşjraömlesztĂ©ses forrasztási technolĂłgia kritikus lĂ©pĂ©sĂ©nek, a stencilnyomtatási folyamatnak a gĂ©pi tanuláson alapulĂł modellezĂ©si lehetĹ‘sĂ©geit. IsmertetjĂĽk az egyes gĂ©pi tanulási mĂłdszerek alapjait, majd pedig a következĹ‘ gĂ©pi tanulási mĂłdszerek optimalizálását a stencilnyomtatás tekintetĂ©ben: mestersĂ©ges neurális hálĂłzat, neuro-fuzzy rendszer, szupport-vektor gĂ©pek, boost-olt döntĂ©si fák. A mĂłdszerek vizsgálatához Ă©s optimalizáláshoz kĂsĂ©rleti Ăşton nyertĂĽk a tanĂtĂł adathalmazt, melynek bementi paramĂ©terei a forraszpaszta szemcsemĂ©retĂ©nek tulajdonságai, a stencilapertĂşra mĂ©rete Ă©s a nyomtatási sebessĂ©g. A folyamat minĹ‘sĂ©gĂ©t jellemzĹ‘ kimeneti paramĂ©terek pedig a forraszpaszta-lenyomatok terĂĽlete, magassága, tĂ©rfogata. Az egyes, gĂ©pi tanulási mĂłdszerek becslĂ©si hibáját az átlagos abszolĂşt százalĂ©kos hiba (MAPE – mean absolute percentage error) Ă©rtĂ©kĂ©vel jellemeztĂĽk. A vizsgált gĂ©pi tanulási mĂłdszerek teljesĂtmĂ©nyĂ©t összessĂ©gĂ©ben megfelelĹ‘nek találtuk (az átlagos becslĂ©si hiba 5% alatti), kivĂ©ve a neuro-fuzzy rendszert, melynek alkalmazását nem javasoljuk a stencilnyomtatási folyamat modellezĂ©sĂ©re
Analyzing the overfitting of boosted decision trees for the modelling of stencil printing
Stencil printing is one of the key steps in reflow soldering technology, and by the spread of ultra-fine-pitch components, analysis of this process is essential. The process of stencil printing has been investigated by a machine learning technique utilizing the ensemble method of boosted decision trees. The phenomenon of overfitting, which can alter the prediction error of boosted decision trees has also been analyzed in detail. The training data set was acquired experimentally by performing stencil printing using different printing speeds (from 20 to 120 mm/s) and various types of solder pastes with different particle sizes (particle size range 25–45 μm, 20–38 μm, 15–25 μm) and different stencil aperture sizes, characterized by their area ratio (from 0.35 to 1.7). The overfitting phenomenon was addressed by training by using incomplete data sets, which means that a subset of data corresponding to a particular input parameter value was excluded from the training. Four cases were investigated with incomplete data sets, by excluding the corresponding data subsets for: area ratios of 0.75 and 1.3, and printing speeds of 70 mm/s and 85 mm/s. It was found that the prediction error at input parameter values that have been excluded from the training can be lowered by eliminating the overfitting; though, the decrease in the prediction error depends on the rate of change in the output parameter in the vicinity of the respective input parameter value
Predicting the Transfer Efficiency of Stencil Printing by Machine Learning Technique
Experiment was carried out for acquiring data regarding the transfer efficiency of stencil printing, and a machine learning-based technique (artificial neural network) was trained for predicting that parameter. The input parameters space in the experiment included the printing speed at five different levels (between 20 and120 mm/s) and the area ratio of stencil apertures from 0.34 to1.69. Three types of lead-free solder paste were also investigated as follows: Type-3 (particle size range is 20–45 μm), Type-4 (20–38 μm), Type-5 (10–25 μm). The output parameter space included the height and the area of the print deposits and the respective transfer efficiency, which is the ratio of the deposited paste volume to the aperture volume. Finally, an artificial neural network was trained with the empirical data using the Levenberg–Marquardt training algorithm. The optimal tuning factor for the fine-tuning of the network size was found to be approximately 9, resulting in a hidden neuron number of 160. The trained network was able to predict the output parameters with a mean average percentage error (MAPE) lower than 3%. Though, the prediction error depended on the values of the input parameters, which is elaborated in the paper in details. The research proved the applicability of machine learning techniques in the yield prediction of the process of stencil printing
Oktatás a felhőben: a mikroelektronikai felhőalapú szövetség (MECA)
A felsĹ‘oktatási intĂ©zmĂ©nyeknek általában fokozott kihĂvással kell szembenĂ©zniĂĽk, amikor a tudományágak terĂĽleteinek szĂ©les körű lefedĂ©sĂ©vel szeretnĂ©k a szĂĽksĂ©ges oktatási infrastruktĂşrát Ă©s szakĂ©rtĹ‘i hátteret kialakĂtani. EzĂ©rt is van szĂĽksĂ©g a szakterĂĽleteket átfogĂł virtuális oktatási anyagokra, amelyek kifejlesztĂ©se Ă©s alkalmazása az elmĂşlt Ă©vtizedek fontos oktatási irányzatainak tekinthetĹ‘ek. A BME egy eurĂłpai Erasmus+ program keretĂ©n belĂĽl csatlakozott a MECA (Microelectronics Cloud Alliance) konzorciumhoz, amelyben az egyetemek a projekt partnerek számára egy felhĹ‘alapĂş oktatási rendszer keretĂ©ben biztosĂtanak hozzáfĂ©rĂ©st távoli hálĂłzati megoldások keretein belĂĽl egymás mikroelektronikai felszerelĂ©seinek leĂrásaihoz, tananyagokhoz, laboratĂłriumi, kutatási, illetve szoftver rendszereihez