755 research outputs found
Search Rank Fraud De-Anonymization in Online Systems
We introduce the fraud de-anonymization problem, that goes beyond fraud
detection, to unmask the human masterminds responsible for posting search rank
fraud in online systems. We collect and study search rank fraud data from
Upwork, and survey the capabilities and behaviors of 58 search rank fraudsters
recruited from 6 crowdsourcing sites. We propose Dolos, a fraud
de-anonymization system that leverages traits and behaviors extracted from
these studies, to attribute detected fraud to crowdsourcing site fraudsters,
thus to real identities and bank accounts. We introduce MCDense, a min-cut
dense component detection algorithm to uncover groups of user accounts
controlled by different fraudsters, and leverage stylometry and deep learning
to attribute them to crowdsourcing site profiles. Dolos correctly identified
the owners of 95% of fraudster-controlled communities, and uncovered fraudsters
who promoted as many as 97.5% of fraud apps we collected from Google Play. When
evaluated on 13,087 apps (820,760 reviews), which we monitored over more than 6
months, Dolos identified 1,056 apps with suspicious reviewer groups. We report
orthogonal evidence of their fraud, including fraud duplicates and fraud
re-posts.Comment: The 29Th ACM Conference on Hypertext and Social Media, July 201
Local Exhaust Ventilation and Application: A Review
The industries that are involved in the production
of dangerous chemicals requires Local Exhaust Ventilation
(LEV) for separating employees to hazards. LEV purpose is to
separate contaminants from the source it generated. The
objective of this paper is to look at a number of studies related to
the LEV and its applications. The discussions are divided to
several parts such as application in construction industries,
buildings, manufacturing industries, workshops and paint
manufacturers. Ongoing monitoring, maintenance and effective
personal protective equipment (PPE) are necessary to ensure the
spray booths can be managed properly and avoid employee
exposure to contaminants. Ventilation design in buildings,
equipment selection and use of Computational Fluid Dynamics
(CFD) is highly suggested in that application. There are no
exposures to hazardous materials to the building users in the
construction of hospitals and others. Use of push-pull ventilation
method is an efficient. The future phase of ventilation system in
airplanes and hawker centre will be the consumer's attention
Design of Local Exhaust Ventilation for Spray Booths: Proposed Study
Workers are exposed to contaminant at workplace. Employers in Malaysia shall comply with Factories and Machineries
Act 1967 and Occupational Safety and Health 1994 to minimize the exposure that hazardous to workers health.
Engineering control such as to provide Local Exhaust Ventilation (LEV) is to control contaminant to the employees. This
report is a research proposal to carry out for Local Exhaust Ventilation study at Automobile Assembly Plant in Malaysia
focusing in spray paint to look on current design and purpose new design and advanced material to the system. Data
collections are based on survey questionnaires, chemical monitoring, LEV inspection, testing and examination. Expected
results are comparison from experimental, analytical and finite-element used in automotive industries prediction of
advanced material will propose to the systems
Materials Science Research Rack Onboard the International Space Station
The Materials Science Research Rack (MSRR) is a research facility developed under a cooperative research agreement between NASA and ESA for materials science investigations on the International Space Station (ISS). MSRR was launched on STS-128 in August 2009 and currently resides in the U.S. Destiny Laboratory Module. Since that time, MSRR has logged more than 1000 hours of operating time. The MSRR accommodates advanced investigations in the microgravity environment on the ISS for basic materials science research in areas such as solidification of metals and alloys. The purpose is to advance the scientific understanding of materials processing as affected by microgravity and to gain insight into the physical behavior of materials processing. MSRR allows for the study of a variety of materials, including metals, ceramics, semiconductor crystals, and glasses. Materials science research benefits from the microgravity environment of space, where the researcher can better isolate chemical and thermal properties of materials from the effects of gravity. With this knowledge, reliable predictions can be made about the conditions required on Earth to achieve improved materials. MSRR is a highly automated facility with a modular design capable of supporting multiple types of investigations. The NASA-provided Rack Support Subsystem provides services (power, thermal control, vacuum access, and command and data handling) to the ESA-developed Materials Science Laboratory (MSL) that accommodates interchangeable Furnace Inserts (FI). Two ESA-developed FIs are presently available on the ISS: the Low Gradient Furnace (LGF) and the Solidification and Quenching Furnace (SQF). Sample Cartridge Assemblies (SCAs), each containing one or more material samples, are installed in the FI by the crew and can be processed at temperatures up to 1400C. ESA continues to develop samples with 14 planned for launch and processing in the near future. Additionally NASA has begun developing SCAs to support US PIs and their partners. The first of these Flight SCAs are being developed for investigations to support research in the areas of crystal growth and liquid phase sintering. Subsequent investigations are in various stages of development. US investigations will include a ground test program in order to distinguish the particular effects of the absence of gravity
A study on awareness of household waste separation in Parit Raja, Batu Pahat, Johor: rural areas
Malaysia is embarking on green initiatives which have been expressly stipulated in the Eleventh Malaysia Plan (2016-2020). In order to transform ideas into reality, the government has identified six strategic thrusts and six game changers that will help Malaysia to stay ahead of global challenges and opportunities in the next five years. In one of the strategic thrusts, the government has planned a greener trajectory for sustainability and resilience [1]. As a result, governmental agencies such as the Department of Environment (DOE) has been given the mandate to conserve and protect the environment and its natural resources for present and future generations. Among the ways applied by the government for solving environmental problems, especially waste generation, include waste minimization, compost and incineration. The Public Cleansing Management Act 2007 (SWPCM Act 2007) came into force on 1 September 2011. It was administered by the Ministry of Housing and Local Government. The main objective of the act is to regulate the management of controlled solid waste and to ensure high-quality services in solid waste management [2]. Apart from the government, the community should also play its role in minimizing waste generation at household level
Validation of Phonon Physics in the CDMS Detector Monte Carlo
The SuperCDMS collaboration is a dark matter search effort aimed at detecting
the scattering of WIMP dark matter from nuclei in cryogenic germanium targets.
The CDMS Detector Monte Carlo (CDMS-DMC) is a simulation tool aimed at
achieving a deeper understanding of the performance of the SuperCDMS detectors
and aiding the dark matter search analysis. We present results from validation
of the phonon physics described in the CDMS-DMC and outline work towards
utilizing it in future WIMP search analyses.Comment: 6 Pages, 5 Figures, Proceedings of Low Temperature Detectors 14
Conferenc
Characterization of flow rate and Heat Loss in Heating, Ventilation and Air Conditioning (HVAC) Duct System for Office Building
A building is an assemblage that is firmly attached to the ground and provides the performance of human
activities and need to be considered in the daily operation in that building. The improvements in building performance are
focused on improving the energy efficiency of buildings. This is approach by designing heating, ventilation and air
conditioning (HVAC) duct system due to one of the most utilized energy in maintaining building performance and
environment. The objectives of this research is to calculate the air (CFM) supply in office building, to characterize the
velocity and head loss in a round and rectangular HVAC ducting system at various duct thickness and to optimize the
thickness of the duct in HVAC system according to ASHRAE Standard. The increasing of velocity in duct system shows
the increasing of head loss. The round duct design gives the lowest velocity and head loss in HVAC system approximately
around 9.35% as compared to rectangular duct at 0.06 inches thickness. Hence, the trends of the head loss and duct thickness
has influenced in reducing noise in HVAC duct system in order to select the best design concepts which is round shape
design
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