Exploiting multimedia content : a machine learning based approach

Advisors: Prof. M Gopal, Prof. Santanu Chaudhury. Date and location of PhD thesis defense: 10 September 2013, Indian Institute of Technology DelhiThis thesis explores use of machine learning for multimedia content management involving single/multiple features, modalities and concepts. We introduce shape based feature for binary patterns and apply it for recognition and retrieval application in single and multiple feature based architecture. The multiple feature based recognition and retrieval frameworks are based on the theory of multiple kernel learning (MKL). A binary pattern recognition framework is presented by combining the binary MKL classifiers using a decision directed acyclic graph. The evaluation is shown for Indian script character recognition, and MPEG7 shape symbol recognition. A word image based document indexing framework is presented using the distance based hashing (DBH) defined on learned pivot centres. We use a new multi-kernel learning scheme using a Genetic Algorithm for developing a kernel DBH based document image retrieval system. The experimental evaluation is presented on document collections of Devanagari, Bengali and English scripts. Next, methods for document retrieval using multi-modal information fusion are presented. Text/Graphics segmentation framework is presented for documents having a complex layout. We present a novel multi-modal document retrieval framework using the segmented regions. The approach is evaluated on English magazine pages. A document script identification framework is presented using decision level aggregation of page, paragraph and word level prediction. Latent Dirichlet Allocation based topic modelling with modified edit distance is introduced for the retrieval of documents having recognition inaccuracies. A multi-modal indexing framework for such documents is presented by a learning based combination of text and image based properties. Experimental results are shown on Devanagari script documents. Finally, we have investigated concept based approaches for multimedia analysis. A multi-modal document retrieval framework is presented by combining the generative and discriminative modelling for exploiting the cross-modal correlation between modalities. The combination is also explored for semantic concept recognition using multi-modal components of the same document, and different documents over a collection. An experimental evaluation of the framework is shown for semantic event detection in sport videos, and semantic labelling of components of multi-modal document images

The Impact of Transmission Range Over Node Density in Vehicular Ad Hoc Network (Vanet) With Obstruction of Road Infrastructure

Vehicular ad hoc networks have the characteristic to of experiencing rapid change of network topology and mobility. Importantly, vehicular networks are required to deal with different network densities in order to provide efficient routing and data dissemination. These are some of the main characteristic that can affect the performance of the network immensely. The main issue that became the driving factor in implementing this project is the need to fill these gaps of understanding the behavioral of vehicular network performance when they are restrained by certain network condition which in this case, dealing with an obstruction of road infrastructure with varying transmission range and node density. In order to understand this problem, we identify the objectives of this project to integrate SUMO/MOVE (a vehicular traffic generator) into NS-2 to simulate a realistic vehicular ad hoc network environment and to study the performance of the network when the being conditioned into varying settings of transmission range and node density. In this project, we evaluate the network performance of VANETs in a highway environment using SUMO traffic simulator and network simulator, NS-2 which specifically focusing at the toll booths by studying the effect of varying transmission range over node density. From the simulation results, we found out that the smaller transmission range will produce less throughput, higher end to end delay and also higher normalized routing load. Particularly in vehicular ad hoc network, a constant or a fixed transmission range is not efficient enough in maintaining the connectivity in the network. This is due to the unpredictable of traffic conditions in the network. In addition to this, by dynamically changing the transmission range according to its need, will offer the advantage of power saving and increase capacity

Influence of Different Levels of Salinity Stress on Germination and Growth Attributes of Sorghum Cultivars

Salinity stress is a major environmental constrain now a day that is considerably reducing the agricultural production. This study was planned to determine the impact of different levels of salinity stress on the germination and growth attributes of different sorghum cultivars. The experiment comprised of four different levels of salinity stress i.e., T1= 0 mM NaCl, T2= 40 mM NaCl, T3= 80 mM NaCl and T4=120 mM NaCl and five sorghum cultivars i.e., C1=JS-263 C2=Hagari, C3= JS-2002, C4=Jawar-2011 and C5=YS-2016. The results revealed that salinity levels significantly reduced the germination and growth attributes, while the tested cultivars also had the differential response towards the salinity tolerance. As regard the salinity stress minimum T50, maximum germination percentage, root and shoot growth were recorded without salinity stress, whereas the maximum T50, lowest germination percentage and substantial reduction in root and shoot growth were recorded with 120 mM NaCl solution. Similarly, cultivar JS-263 performed superiorly in terms of germination, root and shoot growth, followed by Jawar-2016, whereas cultivar JS-2002 performed poorly among the tested cultivars. These results suggested that salinity stress considerably reduced the germination and root and shoot growth of seedlings, in addition, cultivar JS-263 was characterized as more salt tolerant as compared to the other tested cultivars

The effectiveness of non-regulated HSE cases in the drilling industry

Background and PurposeThe safety case regime, as a control measure to major accident hazard, was introduced to the oil and gas industry, three decades ago, following the Piper Alpha disaster. It appeared that safety cases had not passed the cost-benefit analysis, and its effectiveness had not been ascertained. This study investigated the effectiveness of non-regulated safety cases, within one of the oil and gas drilling companies, by determining its level of utilisation and examining its impact on the risks of major accidents and other rig incidents.MethodThe study design was cross sectional, retrospective and experimental. A questionnaire was administered electronically, after it had been tested and its validity and reliability had been assured, to five rig supervisors of 10 rigs that owned safety cases. Incidents were extracted from the company incident logs. The risk of major accidents and other rig incidents were compared and analysed before and after the introduction of safety cases, and against a control group.ResultsOut of 50 rig supervisors, 42 (84%) completed the questionnaire. The majority of the respondents indicated that they did not perceive a rig safety case as the most effective tool in reducing major accident risks; however, they agreed that safety cases were still required. Moreover, the introduction of safety cases to six rigs did not reduce the risk of major accidents or other rig incidents.Discussion and ConclusionsThe level of utilisation of non-regulated safety cases was evaluated to be below average. Furthermore, the evidence showed that safety cases did not reduce the risk of incidents. Conversely, the majority of the respondents indicated that safety cases were still needed in the drilling industry. The aim and objectives of the study were achieved; four hypotheses were tested, and recommendations were put forward for the company management and future researchers

Efektivitas Komunikasi Dalam Organisasi

The need of communication in today’s business competition is continually changing. The advancement of information technology and the changing in managing organization has altered the way that many organizations communicate. The information technology is a tool to communicate with many different groups. The communication process should be managed effectively since not all managers and individu in an organization have good communication skills abd there is an obvious need for training to ensure that they are able to choose the most appropriate communication method to get the message across clearly understood by the receiver and on the other hand, the receiver should be able to supply some feedback

Brand loyalty among Norwegian car owners

Author's accepted version (postprint).Available from 28/04/2019

Progression of group-III sesquioxides: epitaxy, solubility and desorption

In recent years, ultra-wide bandgap semiconductors have increasingly moved into scientific focus due to their outstanding material properties, making them promising candidates for future applications within high-power electronics or solar-blind photo detectors. The group-III-sesquioxides can appear in various polymorphs, which influences, for instance, the energy of the optical bandgap. In gallium oxide, the optical bandgap ranges between 4.6 and 5.3 eV depending on the polymorph. For each polymorph it can be increased or decreased by alloying with aluminum oxide (8.8 eV) or indium oxide (2.7–3.75 eV), respectively, enabling bandgap engineering and thus leading to an extended application field. For this purpose, an overview of miscibility limits, the variation of bandgap and lattice constants as a function of the alloy composition are reviewed for the rhombohedral, monoclinic, orthorhombic and cubic polymorph. Further, the effect of formation and desorption of volatile suboxides on growth rates is described with respect to chemical trends of the discussed ternary materials

Tomographic shadowgraphy of swirled non-reactive spray injection in a generic aero engine burner under realistic operating conditions

This contribution describes the application of tomographic shadowgraphy to measure instantaneous velocities of droplets undergoing airblast-atomization in the non-reactive flow of a generic aero engine burner model at Weber numbers of Weaero = 36

Wymagania logistyczne opakowań transportowych

Udostępnienie publikacji Wydawnictwa Uniwersytetu Łódzkiego finansowane w ramach projektu „Doskonałość naukowa kluczem do doskonałości kształcenia”. Projekt realizowany jest ze środków Europejskiego Funduszu Społecznego w ramach Programu Operacyjnego Wiedza Edukacja Rozwój; nr umowy: POWER.03.05.00-00-Z092/17-00

Molecular mechanism of poly(ADP-ribosyl)ation by PARP1 and identification of lysine residues as ADP-ribose acceptor sites

Poly(ADP-ribose) polymerase 1 (PARP1) synthesizes poly(ADP-ribose) (PAR) using nicotinamide adenine dinucleotide (NAD) as a substrate. Despite intensive research on the cellular functions of PARP1, the molecular mechanism of PAR formation has not been comprehensively understood. In this study, we elucidate the molecular mechanisms of poly(ADP-ribosyl)ation and identify PAR acceptor sites. Generation of different chimera proteins revealed that the amino-terminal domains of PARP1, PARP2 and PARP3 cooperate tightly with their corresponding catalytic domains. The DNA-dependent interaction between the amino-terminal DNA-binding domain and the catalytic domain of PARP1 increased Vmax and decreased the Km for NAD. Furthermore, we show that glutamic acid residues in the auto-modification domain of PARP1 are not required for PAR formation. Instead, we identify individual lysine residues as acceptor sites for ADP-ribosylation. Together, our findings provide novel mechanistic insights into PAR synthesis with significant relevance for the different biological functions of PARP family members