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Characterization of the Origin of Pollutants in Groundwater from Biostatistical Tests:The Case of Catchment Ehania,South-Eastern Cote d’Ivoire

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Journal of Water Resource and Protection 2013年第12期5卷 1178-1185页

作者： Brou Dibi Arthur Brice Konan-Waidhet Felix Koffi Konan Charles Sagne Yao alex kouadio zile Issiaka Savane Dago Gnakri Universite Jean Lorougnon Guede Daloa DaloaCote d’Ivoire Universite Nangui Abrogoua AbidjanAbidjanCote d’Ivoire

The threat of agro-industrial exploitations on the quality of groundwater resources has become a major concern for the world’s population, mainly in agricultural areas. To solve this problem, several methods such as vulnerability to pollutants and statistics methods, have been adopted to protect these groundwaters. In this study, statistical tests were used to determine the likely source of pollutants in the groundwater resources. First, we made a comparative analysis and then analyzed pollutants parameters using Kohonen self-organizing map (SOM) which allows basic on the similarity to help out any correlation between the physic-chemical parameters. To validate these results, a land use map was developed to identify the sources of pollutants in production functions of different activities taking place on the catchment area. The results indicate very high levels of certain pollutants such as NO3-, Cl- and SO42- with generally higher than World Health Organization (WHO) standards values. These high levels observed could be attributed to the generally free nature of aquifers alteration and sedimentary formations in areas of high agro-industrial production. The analysis of the data from SOM method reveals a strong correlation between pollutants (NO3-, SO42-,Cl- ) and conductivity showing the likely origin of these surface pollutants,an origin that is linked to the existence of larges agro-industrials exploitations. These results are reinforced by those of the overlay map of the sampling sites on the land use map, which shows a strong coincidence between high values of pollutants and production areas of the pollutants that are agro-industrial exploitations. These areas of coincidence are observed in the north where found banana’s industrials plantations that are less visible and mostly in the southwest part where is one of the largest oil palm plantations in the world (36,000 hectares).

关键词： Characterization Origin of Pollutants Groundwater Biostatistical Tests Catchment Ehania

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Rain-Flow Modeling Using a Multi-Layer Artificial Neural Network on the Watershed of the Cavally River(Cote d’Ivoire)

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Journal of Water Resource and Protection 2017年第12期9卷 1403-1413页

作者： Brou Loukou alexis Kouassi Kouakou Lazare Konan Kouakou Seraphin kouadio zile alex Konan Koffi Felix Kamagate Bamory Universite Jean Lorougnon Guede DaloaCote d’Ivoire Universite Nangui-Abrogoua AbidjanCote d’Ivoire

Water resources management is nowadays a significant stake for the world. However, missing or bad quality of the hydro-climatic historical data available of the studied area makes sometimes hydrological studies difficult. Generally, conceptual rain-flow models are designed to bring an appropriate answer with the correction of gaps and prediction of the flows. Historical hydro-climatic data of the Ity station, located on Cavally River, contain gaps which must be bridged. This study aims to establish a rainfall-runoff model through artificial neural networks for filling the gaps into the flow data series of the hydrometric station of Ity on the watershed of Cavally River. A multi-layer perceptron of feed forwards with two entries (monthly average rain and evapotranspiration) and an exit (flows) was established with flow evapotranspiration data. Comparison of the criteria of performance of the various architectures of the neural network model showed that architecture 2-3-1 gives best results. This architecture provides Nash coefficients of 75.79% and correlation linear coefficient of 95.64% for the calibration and Nash coefficients of 73.32% and correlation linear coefficient of 98.33% for the validation. The correlations between simulated flows and observed flows are strong. The correlation coefficients are 83.89% and 83.08% respectively for the calibration and validation.

关键词： Rain-Flow Modeling Artificial Neural Network Cavally River Cote d’Ivoire

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1D-2D Hydraulic Modeling of a Diversion Channel on the Cavally River in Zouan-Hounien,Cote d’Ivoire

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Journal of Water Resource and Protection 2019年第8期11卷 1036-1048页

作者： Kouassi Kouakou Lazare Brou Loukou alexis Yao Affoue Berthe kouadio zile alex Konan Kouakou Seraphin Konan Koffi Felix Koffi Berenger Department of Geology University Jean Lorougnon GUEDEDaloaCote d’Ivoire

On the Cavally River, located on the border between C?te d’Ivoire and Liberia, several hydraulic structures such as bridges and diversion channels are planned to be made in recent years in the operating perimeter of the Ity mining company. A 1D-2D hydraulic model was developed to design a diversion channel to cut a meander of the Cavally River in order to ensure hydraulic operation similar to the initial conditions of the river (water levels, flow and velocities). This model was designed with a flow rate of 240 m3/s and a Manning coefficient of 0.052 m1/3·s-1 for the minor bed and 0.06 m1/3·s-1 for the major bed. The results from the hydraulic model show that the hydraulic conditions (water levels, velocities) in the channel before and after the diversion remain almost like those of the Cavally River.

关键词： Hydraulic Modeling Diversion Channel Cavally River Ity Cote d’Ivoire

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Webmapping of Floods in the West of the Ivorian Coast

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Journal of Geographic Information System 2022年第5期14卷 478-486页

作者： Jacques Tiemele alex Agoua Brice Mobio Eric Djagoua kouadio Affian University Center for Research and Application in Remote Sensing (CURAT) University Félix Houphou&euml t-Boigny of Cocody Abidjan C&ocirc te d’Ivoire

To provide answers to the problem of the management of its coastal zone, Côte d’Ivoire has initiated a pooling of data collected on the coast to feed its environmental information management system. To this end, it was a question of creating an interactive platform for decision support for the development of this coastal zone. To achieve this objective, high spatial resolution raster data from 15 to 90 m from the Shuttle Radar Topography Mission and land cover vector data from 2017 were collected for processing in Websig software (QGIS 3.4, PostGreSql 10.5, PostGIS), published and displayed in Geoserveur for programming HTML, CSS and JavaScript codes in Atom. The results first made it possible to visualize the main issues in the interface, in particular, the rivers, the classified forests, the degraded forests, the intact forests, the housing and the industrial plantations and then to assess the risks of floods in Sassandra and San-Pédro. For overflow hazards 100 m beyond the shore, it is the houses, part of the forests and some bare soil that are submerged. As for the risks of overflowing 200 to 500 m beyond the shore, it is a large part of the housing, soils and intact forests that will be flooded. This tool must be made available to the final beneficiaries (users) by putting it online and listing it in the main search engines.

关键词： Interactive Platform WebSIG Geoserveur Sassandra San-Pédro Côte d’Ivoire

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A PLS blockchain for IoT applications:protocols and architecture

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Cybersecurity 2018年第1期1卷 993-1009页

作者： alex Shafarenko Department of Computer Science University of HertfordshireHatfield AL109ABUK

This paper proposes an architecture and a protocol suite for a permissioned blockchain for a local IoT *** architecture is based on a sealed Sequencer and a Fog Server running(post-quantum)Guy Fawkes *** blocks of the blockchain are stored in networked Content Addressable Storage alongside any user data and validity *** maintain that a typical IoT device can,despite its resource limitations,use our blockchain protocols directly,without a trusted *** includes posting and monitoring transactions as well as off-chain(post-quantum)emergency communications without an explicit public key.

关键词： Blockchain Guy Fawkes protocol Post-quantum HORS-OTS LoRa Concurrent transmission

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Indexing structures for the PLS blockchain

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Cybersecurity 2021年第1期4卷 561-579页

作者： alex Shafarenko University of Hertfordshire AL109AB HertfordshireUK

This paper studies known indexing structures from a new point of view:minimisation of data exchange between an IoT device acting as a blockchain client and the blockchain server running a protocol suite that includes two Guy Fawkes protocols,PLS and *** PLS blockchain is not a cryptocurrency instrument;it is an immutable ledger offering guaranteed non-repudiation to low-power clients without use of public key *** novelty of the situation is in the fact that every PLS client has to obtain a proof of absence in all blocks of the chain to which its counterparty does not contribute,and we show that it is possible without traversing the block’s Merkle *** obtain weight statistics of a leaf path on a sparse Merkle tree theoretically,as our ground *** the theory we quantify the communication cost of a client interacting with the *** show that large savings can be achieved by providing a bitmap index of the tree compressed using Tunstall’s *** further show that even in the case of correlated access,as in two IoT devices posting messages for each other in consecutive blocks,it is possible to prevent compression degradation by re-randomising the IDs using a pseudorandom bijective *** propose a low-cost function of this kind and evaluate its quality by simulation,using the avalanche criterion.

关键词： PLS blockchain Guy Fawkes protocol Content-addressable storage Data-structure statistics Tunstall coding Pseudorandom bijections

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Conics on Barth-Bauer octics

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Science China Mathematics 2024年第7期67卷 1507-1524页

作者： alex Degtyarev Department of Mathematics Bilkent UniversityAnkara06800Turkey

We analyze the configurations of conics and lines on a special class of Kummer octic surfaces. In particular, we bound the number of conics by 176 and show that there is a unique surface with 176 conics, all irreducible: it admits a faithful action of one of the Mukai groups. Therefore, we also discuss conics and lines on Mukai surfaces: we discover a double plane(ramified at a smooth sextic curve) that contains 8,910 smooth conics.

关键词： K3-surface octic surface Kummer surface conic Mukai group

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Bridging academic science and clinical research in the search for novel targeted anti-cancer agents

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Cancer Biology & Medicine 2015年第4期12卷 316-327页

作者： alex Matter Experimental Therapeutics Center & D3 A*STAR

This review starts with a brief history of drug discovery & development, and the place of Asia in this worldwide effort discussed. The conditions and constraints of a successful translational R&D involving academic basic research and clinical research are discussed and the Singapore model for pursuit of open R&D described. The importance of well-characterized, validated drug targets for the search for novel targeted anti-cancer agents is emphasized, as well as a structured, high quality translational R&D. Furthermore, the characteristics of an attractive preclinical development drug candidate are discussed laying the foundation of a successful preclinical development. The most frequent sources of failures are described and risk management at every stage is highly recommended. Organizational factors are also considered to play an important role. The factors to consider before starting a new drug discovery & development project are described, and an example is given of a successful clinical project that has had its roots in local universities and was carried through preclinical development into phase I clinical trials.

关键词： Drug discovery drug development translational R&D targeted anti-cancer agents

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Data Warehouse Design for Big Data in Academia

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Computers, Materials & Continua 2022年第4期71卷 979-992页

作者： alex Rudniy Department of Computing Sciences University of ScrantonScranton18510PAUSA

This paper describes the process of design and construction of a data warehouse(“DW”)for an online learning platform using three prominent technologies,Microsoft SQL Server,MongoDB and Apache *** three systems are evaluated for corpus construction and descriptive *** case also demonstrates the value of evidence-centered design principles for data warehouse design that is sustainable enough to adapt to the demands of handling big data in a variety of ***,the paper addresses maintainability-performance tradeoff,storage considerations and accessibility of big data *** this NSF-sponsored work,the data were processed,transformed,and stored in the three versions of a data warehouse in search for a better performing and more suitable *** data warehouse engines-a relational database,a No-SQL database,and a big data technology for parallel computations-were subjected to principled ***,construction and evaluation of a data warehouse were scrutinized to find improved ways of storing,organizing and extracting *** work also examines building corpora,performing ad-hoc extractions,and ensuring *** was found that Apache Hive demonstrated the best processing time followed by SQL Server and *** the aspect of analytical queries,the SQL Server was a top performer followed by MongoDB and *** paper also discusses a novel process for render students anonymity complying with Family Educational Rights and Privacy Act *** phases for DW design are recommended:1)Establishing goals at the outset based on Evidence-Centered Design principles;2)Recognizing the unique demands of student data and use;3)Adopting a model that integrates cost with technical considerations;4)Designing a comparative database and 5)Planning for a DW design that is *** for future research include attempting DW design in contexts involving larger data sets,more refined operations,and ensu

关键词： Big data data warehouse MongoDB Apache hive SQL server

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A New Approach to Multivariate Network Traffic Analysis

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Journal of Computer Science & Technology 2019年第2期34卷 388-402页

作者： Jinoh Kim alex Sim Department of Computer Science Texas A&M University Commerce 75428 U.S.A. Computational Research Division Lawrence Berkeley National Laboratory Berkeley CA 94720 U.S.A.

Network traffic analysis is one of the core functions in network monitoring for effective network operations and *** online traffic analysis has been widely studied,it is still intensively challenging due to several *** of the primary challenges is the heavy volume of traffic to analyze within a finite amount of time due to the increasing network *** important challenge for effective traffic analysis is to support multivariate functions of traffic variables to help administrators identify unexpected network events *** this end,we propose a new approach with the multivariate analysis that offers a high-level summary of the online network *** this approach,the current state of the network will display patterns compiled from a set of traffic variables,and the detection problems in network monitoring(e.g.,change detection and anomaly detection)can be reduced to a pattern identification and classification *** this paper,we introduce our preliminary work with clustered patterns for online,multivariate network traffic analysis with the challenges and limitations we *** then present a grid-based model that is designed to overcome the limitations of the clustered pattern-based *** will discuss the potential of the new model with respect to the technical challenges including streaming-based computation and robustness to outliers.

关键词： network traffic analysis multivariate analysis time-series similarity network monitoring

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