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Ditemukan 16514 dokumen yang sesuai dengan query
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Adeyemi Hezekiah Oluwole
"In
this study, a fuzzy-based expert system called the Pain Intensity Prediction
Expert System (PIPES) was developed to predict pain severity risk (PSR) in
shoveling-related tasks. The primary objective was to develop a non-changing rating risk assessment ergonomics
tool that both efficient
and comparable with those obtained from human ergonomics experts in the field
of application. PIPES used fuzzy set
theory (FST) to make decisions about the level of pain associated with a
selected worker base on the measured task variables, namely scooping rate, scooping time, shovel load, and
throw distance as input and PSR as the result. Values obtained from variable measurements from a sand shoveling task
were run with PIPES, and the results were compared with the workers?
self-reported pain (WSRP) intensity using a numeric rating scale (NRS) tool. The result of validation showed that there was a
strong positive relationship between WSRP NRS and PIPES NRS, with a correlation
coefficient of 0.70. The independent sample t-test for mean difference showed that WSRP had a statistically significantly lower level of NRS (4.35 ± 2.1)
compared to PIPES (4.75 ± 2.2), t (38) = - 0.591, p = 0.558. With a
significance level of 0.001 at 95% confidence, the groups? means were not
significantly different. The study developed an expert system, PIPES, which can be used as a computerized
representation of ergonomics experts, who are scarce. PIPES can be applied to construction industries, sand mine locations,
and any workplace where materials are manually moved using a shovel."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Adeyemi Hezekiah Oluwole
"In this study, a fuzzy-based expert system called the Pain Intensity Prediction Expert System (PIPES) was developed to predict pain severity risk (PSR) in shoveling-related tasks. The primary objective was to develop a non-changing rating risk assessment ergonomics tool that both efficient and comparable with those obtained from human ergonomics experts in the field of application. PIPES used fuzzy set theory (FST) to make decisions about the level of pain associated with a selected worker base on the measured task variables, namely scooping rate, scooping time, shovel load, and throw distance as input and PSR as the result. Values obtained from variable measurements from a sand shoveling task were run with PIPES, and the results were compared with the workers’ self-reported pain (WSRP) intensity using a numeric rating scale (NRS) tool. The result of validation showed that there was a strong positive relationship between WSRP NRS and PIPES NRS, with a correlation coefficient of 0.70. The independent sample t-test for mean difference showed that WSRP had a statistically significantly lower level of NRS (4.35 ± 2.1) compared to PIPES (4.75 ± 2.2), t (38) = - 0.591, p = 0.558. With a significance level of 0.001 at 95% confidence, the groups’ means were not significantly different. The study developed an expert system, PIPES, which can be used as a computerized representation of ergonomics experts, who are scarce. PIPES can be applied to construction industries, sand mine locations, and any workplace where materials are manually moved using a shovel."
Depok: Faculty of Engineering, Universitas Indonesia, 2016
UI-IJTECH 7:4 (2016)
Artikel Jurnal  Universitas Indonesia Library
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Ruslawati Abdul Wahab
"Bus arrival time is very
important to passengers, not only at the origin terminal but also at every
stop. If there is no predicted arrival time at a stop, the headway designed
should match the bus frequency at the stop. The uncertainty in bus arrival time
can hinder the headway from matching the bus frequency at the stops. Moreover,
lack of information on the service route and actual arrival times at stops
leads to difficulty for passengers in planning their trips. Observation surveys
were conducted to collect data on the problems of bus arrival frequency and
uncertain arrival times at a selected stop with multiple routes during off-peak
hours in Putrajaya Malaysia. This paper proposes a method to estimate arrival
times at bus stops using the adaptive neuro fuzzy inference system (ANFIS) and
several models are proposed to predict arrival times using MATLAB Curve Fitting
Tool. All the proposed models exhibited RMSE close to 0 and R2 close
to 1."
2017
PR-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Azizollah Khormali
"As a result of
waterflooding, inorganic salt precipitation occurs in the different parts of an
oil production system, thereby leading to damage of production equipment.
Different parameters affect the kinetics of salt precipitation. Scale
inhibitors are widely used to prevent inorganic salt formation. In this study,
the effect of reservoir pressure, temperature, and mixing ratio of injection to
formation water on calcium sulfate and barium sulfate precipitation was
investigated. For this purpose, two different formation waters and one
injection water were used. In addition, the effect of temperature and mixing
ratio on inhibition performance was studied. Four different existing industrial
scale inhibitors and one new scale inhibitor were used. The performance of the
scale inhibitors was determined under static and dynamic conditions. Results of
the study showed that calcium sulfate precipitation increased with an increase
in temperature and a decrease in pressure. Barium sulfate precipitation was
found to increase with a decrease in the temperature. The effect of pressure on
barium sulfate formation was negligible. The developed scale inhibitor showed
the highest performance for the prevention of calcium sulfate and barium
sulfate formation. A change in temperature from 60°C to 120°C reduced the
inhibitor performance by 3%. In the cases of calcium sulfate and barium
sulfate, the minimum performance of the scale inhibitor was observed when the
mixing ratios of injection to formation waters were 60:40 and 50:50,
respectively."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Sanjay S. Chopade
"FinFET (Fin Field-Effect
Transistor) technology has recently seen a major increase in adoption
for use in integrated circuits because of its high immunity to short channel
effects and its further ability to scale
down. Previously, a major research contribution was made to reduce the leakage current in the
conventional bulk devices. So many different alternatives like bulk isolation and oxide isolation are all having some pros and
cons. Here in this paper, we present a novel pile gate FinFET structure to
reduce the leakage current, as compared with Bulk FinFET without using any pstop implant or
isolation oxide as in the
Silicon-on-Insulator (SOI). The major advantage of this type of
structure is that there is no need of high substrate doping, a 100% reduction in the
random dopant fluctuation (RDF) and an increase in the ION/IOFF
value. It can be very useful to improve the drain-induced barrier lowering (DIBL) at smaller
technological nodes. All the work is supported by 3D TCAD simulations, using Cogenda TCAD."
2017
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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"pada pertengahan tahun 2000 terjadi kecelakaan pesawat helikopter, dimana proses terjadinya kecelakaan tersebut yaitu pada saat melakukan take off kemudian terjadi lost power sehingga pesawat berputar ke kiri berbalik arah dan mendarat dengan impact cukup keras. berangkat dari kasus tersebut dilaksanakan penelitian dengan maksud untuk menganalisis sebab-sebab terjadinya kerusakan material tersebut."
050 JDST 2:1 (2011)
Artikel Jurnal  Universitas Indonesia Library
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"struktur dan beban guna. Pertimbangan untuk propelan meliputi masalah ekonomi dan penyimpanan, energetik dan ha-hal yang berkaitan dengan cara kerja motor roket. Pertimbangan untuk struktur meliputi ketahanan material, kondisi lingkungan, pengerjaan, densitas dan faktor ekonomi. Faktor ekonomi yaitu mengenai harga dan ketersediaannya di pasaran. Dalam penyimpanan sangat penting dipertimbangkan sifat-sifat korosifitas, bahaya ledakan dan kebakaran, sifat racun, sifat fisika dan sifat kimia. Pertimbangan faktor energetik, berhubungan dengan jumlah gaya dorong, kemungkinan dapat dimatikan-dihidupkan, waktu penggunaan, jumlah propelan dan antisipasi mengatasi kegagalan. Di samping itu juga pertimbangan dengan cara kerja motor roket, untuk propelan cair. Ketahanan struktur terhadap ruptur, batas elastisitas, modulus Young, kelelahan, keuletan statik dan sifat dapat ditempa. Material harus tahan terhadap lingkungan meliputi keadaan panas, dingin, cairan korosif, sinar matahari, dan hantaman partikel-partikel ionik. Pertimbangan densitas berpengaruh pada berat struktur dan berpengaruh pada indeks konstruksi. Material juga harus mudah didapatkan dan harganya terjangkau
"
620 DIR 4:2 (2009)
Artikel Jurnal  Universitas Indonesia Library
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"Telecommunication technology is very fast developing.One of them is mobile phone technology.The question is how to detect mobile phone position when it is used,especially in emergency....."
COJUTEK
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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Hassn Ahmed H. Hassn
"An effective and real-time traffic information network is highly important and could contribute to decreasing traffic volume and costs by reducing fuel consumption and saving time for drivers in reaching their destinations. This study provides an extensive analysis regarding the drivers? acceptance levels of the current implementation of the Intelligent Transport System (ITS) in Kuala Lumpur. A proposed model from the literature review based on the known Technology Acceptance Model (TAM) is introduced. The ITS system characteristics, information quality, system quality, and service quality were investigated as external variables. The resulting analysis showed that information quality is the highest influential factor followed by system quality. The results also revealed that service quality had no effect on acceptance levels."
International Journal of Technology, 2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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