85,447 research outputs found
Distributed human computation framework for linked data co-reference resolution
No full textDistributed Human Computation (DHC) is a technique used to solve computational problems by incorporating the collaborative effort of a large number of humans. It is also a solution to AI-complete problems such as natural language processing. The Semantic Web with its root in AI is envisioned to be a decentralised world-wide information space for sharing machine-readable data with minimal integration costs. There are many research problems in the Semantic Web that are considered as AI-complete problems. An example is co-reference resolution, which involves determining whether different URIs refer to the same entity. This is considered to be a significant hurdle to overcome in the realisation of large-scale Semantic Web applications. In this paper, we propose a framework for building a DHC system on top of the Linked Data Cloud to solve various computational problems. To demonstrate the concept, we are focusing on handling the co-reference resolution in the Semantic Web when integrating distributed datasets. The traditional way to solve this problem is to design machine-learning algorithms. However, they are often computationally expensive, error-prone and do not scale. We designed a DHC system named iamResearcher, which solves the scientific publication author identity co-reference problem when integrating distributed bibliographic datasets. In our system, we aggregated 6 million bibliographic data from various publication repositories. Users can sign up to the system to audit and align their own publications, thus solving the co-reference problem in a distributed manner. The aggregated results are published to the Linked Data Cloud
Authoritarian Regimes of Rhee Syng-man and Park Chung-hee
No full textThis Bachelor's thesis entitled "Authoritarian Regimes of Rhee Syng-man and Park Chung-hee" aims to provide a comparative study of authoritarian regimes of the first two South Korean presidents, and their respective impact on the political system and society of South Korea. With the help of diachronic comparison methods, the author of this thesis focuses on the reasons behind the leaders' choice of regime, as well as on the overall changes in the form of government in South Korea which took place since the division of the Korean Peninsula until the end of the seventies
Synergy between Zeolite Framework and Encapsulated Sulfur for Enhanced Ion-Exchange Selectivity to Radioactive Cesium
No full textTo eliminate the radioisotope 137Cs+ from contaminated water, various inorganic ion-exchange materials have been developed. Many selective ion-exchange materials are relatively expensive and difficult to prepare, whereas conventional materials such as aluminosilicate zeolites lack ion-exchange selectivity in the presence of competing cations. Here, we report a simple but powerful strategy to significantly increase the Cs+ selectivity of conventional zeolites. We demonstrate that encapsulation of elemental sulfur in the micropores of zeolites (NaA, NaX, chabazite, and mordenite) via vacuum sublimation can remarkably increase the selectivity toward Cs+ in the presence of competing ions. It appears that the elemental sulfur does not provide additional adsorption sites for Cs+ ions but increases the ion-exchange selectivity toward Cs+ by providing additional interaction. Various analyses show that sulfur partially donates its electron to the ion-exchanged Cs+ cations in zeolites, indicating significant Lewis acid–base interaction. According to the hard soft acid base (HSAB) theory, the enhanced Cs+ ion-exchange selectivity can be explained by the fact that sulfur, a soft Lewis base, interacts more strongly with Cs+, which is a softer Lewis acid than other alkali and alkaline earth metal cations. Because of the high intrinsic Cs+ selectivity of bare zeolites and selectivity enhancement resulting from sulfur encapsulation, the sulfur-modified chabazite and mordenite showed highly promising Cs+ capture ability in the presence of various competing ions.
Integration of electrodeposited PdNi alloys with silicon and carbon nanotube electronics
No full textThis thesis investigates the electrodeposition of PdNi films with controllable composition and their suitability as electrical contacts in electronic and spintronic devices based on Silicon and Carbon nanotubes (CNTs). The electrodeposition process and characterisation of the electrical and magnetic properties of the deposited PdNi films are described. PdNi films with a wide composition range can be deposited from the same bath by changing the deposition potential. Electrical characterisation shows the formation of high quality PdNi-Si Schottky barriers while magnetic measurements prove the ferromagnetic nature of the PdNi films. Electrodeposited PdNi films are thus shown to be suitable contacts for electronic and spintronic devices.Hydrogen sensors comprising back to back electrodeposited PdNi-Si Schottky barriers are fabricated and characterised. The back to back architecture ensures low current operation at all biases. Palladium causes the Hydrogen molecules to dissociate and be absorbed by the film, while Nickel makes the sensor resistant to repeated cycling in the Hydrogen environment. The sensors exhibit extremely low idle currents, large percentage current increases on Hydrogen exposure and high selectivity for Hydrogen. These factors, in addition to the simplicity of fabrication and easy integration with conventional electronics show that electrodeposited PdNi-Si Schottky barriers are well suited for use as Hydrogen sensors.The workfunction change in PdNi films exposed to Hydrogen is used to characterise CNTs contacted by electrodeposited PdNi. The PdNi contacted CNTs exhibit ohmic characteristics, which change on exposure to Hydrogen. Examining this change allows differentiation between semiconducting and metallic CNTs. Raman spectroscopy is used to characterise the same CNTs and the results are compared with the electrical characterisation in Hydrogen. The electrical and Raman analysis experimentally verify the theoreticallyassigned CNT Raman features.The fabrication and electrical characterisation of CNT transistors incorporating electrodeposited PdNi contacts are presented. The CNTs are spin coated from a 1,2-dichlorobenzene dispersion and contacted with electrodeposited PdNi. The PdNi-Si Schottky barrier is used to suppress the current through the Silicon substrate during electrical characterisation. The operating restrictions imposed by the direct PdNi-Si contact and methods to overcome the same are discussed. The characteristics of the CNT transistor in a changing magnetic field at room temperature are presented
Particle motion in Stokes flow near a plane fluid-fluid interface. Part 1. Slender body in a quiescent fluid.
No full textConsiders translation and rotation, each in three mutually orthogonal directions, thus determining the components of the hydrodynamic resistance tensors which relate the total hydrodynamic force and torque on the particle to its translational and angular velocities for a completely arbitrary translational and angular motion. Calculates trajectories for a freely rotating particle under the action of an applied force either normal or parallel to a flat interface.-from Author
Shahnizan Imran rangkul Anugerah Kecemerlangan Ir. Kee Book Hee UMPSA
No full textGAMBANG, 26 Oktober 2024 - Berjalan mengikut keselesaan tetapi keluar dari kepompong menjadi prinsip dan kunci kejayaan Shahnizan Imran Mohd Nazri, 24 penerima Anugerah Kecemerlangan Ir. Kee Book Hee pada Majlis Konvokesyen Universiti Malaysia Pahang Al-Sultan Abdullah (UMPSA) Ke-19 yang berlangsung di Dewan Kompleks Sukan UMPSA Kampus Ganbang
Particle motion in Stokes flow near a plane fluid-fluid interface. Part 2. Linear shear and axisymmetric straining flows.
No full textConsiders the motion of a sphere or a slender body in the presence of a plane fluid-fluid interface with an arbitrary viscosity ratio, when the fluids undergo a linear undisturbed flow. Determines the motion of a neutrally buoyant particle freely suspended in the flow. The theory yields general trajectory equations for an arbitrary viscosity ratio. Among the most interesting results for motion of slender bodies is the generalization of the Jeffrey orbit equations for linear simple shear flow. -from Author
Migrain: Apa yang anda perlu tahu
No full textMigrain adalah salah satu jenis sakit kepala yang biasa berlaku, dengan purata sebanyak 2 hingga 15% daripada penduduk dunia pernah mengalaminya. Ianya berada pada tangga yang ke-20 penyebab ketidakupayaan seseorang, yang menyebabkan mereka tidak dapat hadir ke kelas, tidak dapat bekerja, seterusnya mengurangkan tahap kualiti hidup mereka. Ianya melibatkan 15% golongan perempuan dan 6% dari golongan lelaki. Migrain paling kerap berlaku di antara umur 25 hingga 55 tahun.
Ianya adalah jenis sakit kepala nombor 2 dalam hierarki setelah ‘tension type headache’.
Apakah gejalanya??
Sakit kepala yang berterusan, mungkin2 hingga 72 jam.
Sakit kepala yang teruk, biasanya terjadi pada sebelah kepala dan jarang dua-dua belah kepala, berdenyut-denyut dan menjadi lebih teruk apabila melakukan aktiviti fizikal.
Sakit kepala bertambah teruk apabila terdedah kepada cahaya.
Sakit kepala bertambah teruk apabila terdedah kepada bunyi bising.
Kelihatan muka yang pucat.
Loya dan muntah.
Aura berlaku dalam 20% pesakit migrain. Antara gejala aura adalah seperti ‘flashing of light’, ‘shimmering zig-zag lines’ dan mengalami kehilangan ‘visual field’
Motions of a sphere in a time-dependent stokes flow: A generalization of Faxen’s law
No full textA general solution of the unsteady Stokes equation in spherical coordinates is derived for flow in the exterior of a sphere, and then applied to study the arbitrary unsteady motion of a rigid sphere in an unbounded single fluid domain which is undergoing a time-dependent mean flow. Calculation of the hydrodynamic force and torque on the sphere leads to a generalization of the Faxens law to time-dependent flow fields which satisfy the unsteady Stokes equation. For illustrative purposes, we consider the relative motion of gas bubbles which undergo very rapid oscillations so that the generalized Faxens law derived for a solid sphere can be applied. We also demonstrate that our results reduce to those of Faxen for the steady flow limit. © 1987 Korean Institute of Chemical Engineering
Fabrication of ordered macroporous cylinders by colloidal templating in microcapillaries
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