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Ditemukan 41601 dokumen yang sesuai dengan query
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Apichat Janpila
"To
develop seismic design criteria for buildings, seismic hazard analysis is required to estimate the ground motion
intensity with criteria such as peak ground
acceleration (PGA). The seismic hazard can be analyzed by using two approaches: deterministic seismic hazard analysis (DSHA) and
probabilistic seismic hazard analysis (PSHA). In these two approaches, the
seismic hazard is evaluated from past earthquake events and active faults data. In Thailand, seismic hazard is classified in the low lying regions; however, in recently years,
earthquakes have occurred frequently in the North of Thailand. To
prevent and reduce damage due to earthquakes in the future, determination
of seismic hazard is needed. This
research proposes a deterministic seismic hazard
map evaluated from nineteen
active faults affecting
Thailand. Two types of active faults are considered: first, an active fault in a subduction zone and second, a crustal fault. The seismic hazard is evaluated by using a ground
motion prediction equation (GMPEs). Four GMPEs are weighted equally for
seismic crustal fault, and two GMPEs are weighted equally for
a seismic subduction zone. The hypocentral distance is
used to evaluate the seismic hazard for all ground motion prediction equations.
The Northern part and the Western part of Thailand are high seismic hazard
regions, because there are active faults with the large possibility of earthquakes of a maximum magnitude. The seismic
hazards in the North, West and Northeast of Thailand are about 0.60 g.
The seismic hazard in Bangkok is about 0.25 g due to the Three Pagoda fault and Sri Sawat fault. The seismic hazard in the South of Thailand is about 0.40 g."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Apichat Janpila
"To develop seismic design criteria for buildings, seismic hazard analysis is required to estimate the ground motion intensity with criteria such as peak ground acceleration (PGA). The seismic hazard can be analyzed by using two approaches: deterministic seismic hazard analysis (DSHA) and probabilistic seismic hazard analysis (PSHA). In these two approaches, the seismic hazard is evaluated from past earthquake events and active faults data. In Thailand, seismic hazard is classified in the low lying regions; however, in recently years, earthquakes have occurred frequently in the North of Thailand. To prevent and reduce damage due to earthquakes in the future, determination of seismic hazard is needed. This research proposes a deterministic seismic hazard map evaluated from nineteen active faults affecting Thailand. Two types of active faults are considered: first, an active fault in a subduction zone and second, a crustal fault. The seismic hazard is evaluated by using a ground motion prediction equation (GMPEs). Four GMPEs are weighted equally for seismic crustal fault, and two GMPEs are weighted equally for a seismic subduction zone. The hypocentral distance is used to evaluate the seismic hazard for all ground motion prediction equations. The Northern part and the Western part of Thailand are high seismic hazard regions, because there are active faults with the large possibility of earthquakes of a maximum magnitude. The seismic hazards in the North, West and Northeast of Thailand are about 0.60 g. The seismic hazard in Bangkok is about 0.25 g due to the Three Pagoda fault and Sri Sawat fault. The seismic hazard in the South of Thailand is about 0.40 g."
Depok: Faculty of Engineering, Universitas Indonesia, 2016
UI-IJTECH 7:7 (2016)
Artikel Jurnal  Universitas Indonesia Library
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Vergin Raja Sarobin M
"The low-cost Wireless
Sensor Network
(WSN) consists of small battery powered devices called sensors, with limited
energy capacity. Once deployed, accessibility to any sensor node for maintenance and battery replacement is not feasible
due to the spatial scattering of the nodes. This will lead to an unreliable,
limited lifetime and a poor connectivity network. In this paper a novel bio-inspired cluster-based
deployment algorithm is proposed for energy optimization of the WSN
and ultimately to improve the network lifetime. In the cluster initialization
phase, a single
cluster is formed with a single cluster head at the center of the sensing terrain. The
second phase is for optimum cluster formation surrounding
the inner cluster, based on swarming bees and a piping technique. Each cluster member distributes
its data to its corresponding cluster head and the cluster head communicates
with the base station, which reduces the communication distance of each node. The simulation
results show that, when
compared with other clustering algorithms, the proposed algorithm can significantly reduce
the number of clusters by 38% and improve the network lifetime by a factor of
1/4."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Nji Raden Poespawati
"An active Radio-Frequency Identification (RFID) tag is a low-power device, which is often used as a tracking device, where operation of this tag will be in remote areas from an electrical power source. Therefore, this device requires an independent power source. To meet these needs, solar power may be used, which can be accessed anywhere there is sunlight. Supercapacitors (SC) are used as an energy source to support a solar power system. The advantage of supercapacitors, as an energy storage device, is their long life cycle that means more charging and discharging processes compared to a conventional battery. The design and fabrication of a solar power system for an active RFID tag with supercapacitors as the energy storage will be covered in this paper."
[place of publication not identified]: [publisher not identified], 2016
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Artikel Jurnal  Universitas Indonesia Library
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R. Maheswari
"In any heterogeneous system, porting reconfigurable computing is often a high
performance platform for a broad range of computationally challenging issues.
However, efficiently utilizing the maximum potential of these reconfigurable
systems is a difficult job without understanding their performance
characteristics. This work proposes an analytic performance model using Petri
Nets (PN) for a Reconfigurable OR1200 (ROR1200) soft-core processor with model
validation and verifications. By modeling the ROR1200 system using Petri Nets,
both behavioral and structural properties existing in parallel systems were
analyzed. The Bound Level Analysis with respect to the dependency level of data
is also performed on Soft Core Processors (SCP) like the ROR1200, the OR1200
and the MicroBlaze."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Benyamin Kusumoputro
"Cylindrical uranium dioxide pellets, which are the main components for nuclear fuel elements in light water reactors, should have a high density profile, a uniform shape, and a minimum standard quality for their safe use as a reactor fuel component. The quality of green pellets is conventionally monitored by laboratory measurement of the physical pellet characteristics; however, this conventional classification method shows some drawbacks, such as difficult usage, low accuracy, and high time consumption. In addition, the method does not address the non-linearity and complexity of the relationship between pellet quality variables and pellet quality. This paper presents the development and application of a modified Radial Basis Function neural network (RBF NN) as an automatic classification system for green pellet quality. The weight initialization of the neural networks in this modified RBF NN is calculated through an orthogonal least squared method, and in conjunction with the use of a sigmoid activation function on its output neurons. Experimental data confirm that the developed modified RBF NN shows higher recognition capability when compared with that of the conventional RBF NNs. Further experimental results show that optimizing the quality classification problem space through eigen decomposition method provides a higher recognition rate with up to 98% accuracy."
2016
AJ-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Mohamed El-Sakhawy
"The antimicrobial properties of bagasse paper sheets coated with
natural polymers (chitosan, different ratios of (gelatin/glycerol) + chitosan,
hemicellulose, hemicellulose + glycerol, hemicellulose+chitosan) or
synthetic organophosphorus dimer compounds were evaluated in this work.
Hemicelluloses showed moderate activity against Bacillus subtilis and Candida albicans, while chitosan showed weak
activity against B. subtilis. The condition that offered the highest inhibitory
activity of bagasse paper was the one
coated with 1,3-diaryl-2,2,2,4,4,4-hexachlorocyclodiphosph(V)azane
(where aryl is p-chloroaniline or p-anisidine). The developed bagasse papers
were evaluated against Gram-positive bacteria, Gram-negative bacteria, yeasts, and fungi. The highest inhibitory activity was obtained at a concentration of 200
mg/mL for p-chloroaniline with an inhibition zone that varied for different
microbes from 6.9 mm to 26 mm. The highest inhibitory activity was obtained at
300?250 mg/mL for p-anisidine against most of the pathogenic microorganisms
with an inhibition zone that varied for different microbes from 8 mm to 14.75
mm. The observed antimicrobial and antifungal activity properties for bagasse paper coated with 1,3-diaryl
2,2,2,4,4,4-hexachlorocyclodiphosph(V)azane could be attributed to the presence of Cl, P atoms, and the lone pair of
electrons on N atoms in the structure of the dimers."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Alvin Prayuda Juniarta Dwiyantoro
"The routine daily
activities that tend to be sedentary and repetitive may cause severe health
problems. This issue has encouraged researchers to design a system to detect
and record people activities in real time and thus encourage them to do more
physical exercise. By utilizing sensors embedded in a smartphone, many research
studies have been conducted to try to recognize user activity. The most common
sensors used for this purpose are accelerometers and gyroscopes; however, we
found out that a gravity sensor has significant potential to be utilized as
well. In this paper, we propose a novel method to recognize activities using
the combination of an accelerometer and gravity sensor. We design a simple
hierarchical system with the purpose of developing a more energy efficient
application to be implemented in smartphones. We achieved an average of 95% for
the activity recognition accuracy, and we also succeed at proving that our work
is more energy efficient compared to other works."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Abdul Azis Abdillah
"Diabetes is one of the
most serious health challenges in both developed and developing countries. Early detection and accurate diagnosis of
diabetes can reduce the risk of complications. In recent years, the use of machine learning in predicting disease has
gradually increased. A promising classification technique in machine
learning is the use of support vector machines in combination with radial basis
function kernels (SVM-RBF). In this study, we used SVM-RBF to predict diabetes.
The study used a Pima Indian diabetes dataset from the University of
California, Irvine (UCI) Machine Learning Repository. The subjects were female and
≥ 21 years
of age at the time of the index examination. Our experiment design used 10-fold
cross-validation. Confusion matrix and ROC were used to calculate performance
evaluation. Based on the experimental results, the study demonstrated that SVM-RBF
shows promise in aiding diagnosis of Pima Indian diabetes disease in the early
stage."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Warjito
"Batik waste can increase water characteristics, such as turbidity, color
and total suspended solids (TSS). Thus, an efficient technique for separating
Batik from the liquid to decrease these characteristics is needed. The aim of
the current study was to understand the results of flotation using electrolysis
and to investigate the bubble characteristics that influence the results of the
flotation of Batik waste. Flotation studies have been conducted using
electrolysis to produce bubbles to separate batik synthetic dye from the
liquid. Research conducted with 316L stainless steel electrodes, inside a 100
cm tall acrylic pipe with an inner diameter of 8.4 cm and a voltage variation
of 10, 15 and 20 V. Batik waste was mixed with distilled water. Commercial alum
powder [aluminum sulfate, Al2(SO4)3.14H2O,
that is 17% Al2O3] as the reagent was added to coagulate
Batik waste in a ratio of 1 gram per 10 ml of Batik waste. The results showed
that flotation of Batik waste can be used to separate Batik waste with the
addition of alum. Alum was shown to be capable of acting as a collector in this
type of waste separation. The results showed that flotation using electrolysis
could be an effective method for reducing turbidity, color and TSS."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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