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Surabaya, Indonesia

The State University of Surabaya was formerly named IKIP Surabaya is one of the state universities that was specially designed for graduating teachers, qualified for preschool, elementary, junior high, and senior high. In 1999, IKIP Surabaya changed its name to State University of Surabaya and has two main goals: graduate education and non-education students. It has seven faculties and one graduate school, 47 undergraduate programs, 12 diploma programs, and 15 postgraduate and doctorate programs. It has approximately 24,986 students and 834 lecturers . Wikipedia.


Madlazim,State University of Surabaya
Science of Tsunami Hazards | Year: 2011

Indonesia has an Indonesian Tsunami Early Warning System (Ina-TEWS) since 2008. The Ina-TEWS has used automatic processing on hypocenter; Mwp, Mw (mB) and Mj. If earthquake occurred in Ocean, depth < 70 km and magnitude > 7, then Ina-TEWS announce early warning that the earthquake can generate tsunami. However, the announcement of the Ina-TEWS is still not accuracy. Purpose of this study is to estimate earthquake rupture duration of large Indonesia earthquakes that occurred in Indian Ocean, Java, Timor Sea, Banda Sea, Arafura Sea and Pacific Ocean using a direct procedure and software developed Lomax and Michelini for rapid assessment of earthquake tsunami potential by deriving two simple measures from vertical component broadband P-wave velocity record. The first is the high-frequency apparent rupture duration, Tdur which may be related to can be related to the critical parameters rupture length (L), depth (z), and shear modulus (μ). The second is a confirmation of the earlier finding by Lomax and Michelini, namely that the rupture duration has a stronger influence to generate tsunami than Mw and Depth. We analyzed at least 510 vertical seismogram recorded by GEOFON-IA and IRIS-DMC networks. Our analysis shows that the seismic potency, LWD, which is more obviously related to capability to generate a tsunami than former. The larger Tdur the larger is the seismic potency LWD because Tdur is proportional to L/vr (with vr - rupture velocity). We also suggest that tsunami potential is not directly related to the faulting type of source and for events that have rupture duration greater than 50 s, the earthquakes generated tsunami. With available real-time seismogram data, rapid calculation, rupture duration discriminant can be completed within 3 to 8 min after the P-onset. Source


Koestiari T.,State University of Surabaya
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2014

The objective of this research was to determine the Bentonite-Signa (B-S) and pillaring Al bentonite (B-Al/400oC) characters that can be used to adsorb Mg2+ ions. Laboratory experimental study consist of two stages, characterization phase of B-S and B-Al using Spectrophotometer IR Buck Scientific - 500, X-Ray Diffraction X'PERT Phillips, Gas Sorption Analyzer Quantachrome NovaWin2, Scanning Electron Microscope, and Atomic Absorption Spectrometer (AAS) Perkin Elmer AA-100 to showed adsoption capacity for two adsorbens. The result of this research showed: 1). B-S and B-Al have different of interlayer as 12,4374 A (B-S) and 9,3047 A (B-Al); surface area 24,78 m2/g (B-S) and 217,021 m2/g; total pore volume of radii which smaller than 1001,9 A (B-S) and 1273,1 A (B-Al), respectively. 2) The difference in the number of active sites of two adsorbents, cause the adsorption capacity of B-S is greater than that of B - Al. 3). At the system of pH 5, 6, 7, and 9 the adsorption capacities of B-S is greater than B-Al for Mg2+, respectively. Source


Buditjahjanto I.G.P.A.,State University of Surabaya | Miyauchi H.,Kumamoto University
International Journal of Information Technology and Decision Making | Year: 2011

Learning decision making through playing a game is an interesting activity for the decision maker or player. In this paper, a multiobjective optimization problem for economic and emission dispatch in which the player can learn about the tradeoff between fuel cost (economic) and emission problems to achieve optimal decisions is considered. A nonplayer character (NPC) is an entity that is built to provide intelligent decision support for the player. The proposed approach is carried out in two stages for the NPC module: the first stage uses the nondominated sorting genetic algorithm II method to solve the multiobjective optimization problem; this stage produces some optimal solutions. The next stage uses subtractive clustering to cluster optimal solutions; furthermore, these clusters are used to build a fuzzy inference system based on the Mamdani type. In this stage, players can select the best decision offered by the NPC. © 2011 World Scientific Publishing Company. Source


Madlazim,State University of Surabaya
AIP Conference Proceedings | Year: 2011

Indonesia has Indonesian Tsunami Early Warning System (Ina-TEWS) since 2008. The Ina-TEWS has used automatic processing on hypocenter; Mwp, Mw (mB) and Mj. If earthquake occurred in Ocean, depth < 70 km and magnitude > 7, then Ina-TEWS announce early warning that the earthquake can generate tsunami. However, the announcement of the Ina-TEWS is still not accuracy. Purposes of this research are to estimate earthquake rupture duration of large Indonesia earthquakes that occurred in Indian Ocean, Java, Timor sea, Banda sea, Arafura sea and Pasific ocean. We analyzed at least 330 vertical seismogram recorded by IRIS-DMC network using a direct procedure for rapid assessment of earthquake tsunami potential using simple measures on P-wave vertical seismograms on the velocity records, and the likelihood that the high-frequency, apparent rupture duration, Tdur. Tdur can be related to the critical parameters rupture length (L), depth (z), and shear modulus (μ) while Tdur may be related to wide (W), slip (D), z or μ. Our analysis shows that the rupture duration has a stronger influence to generate tsunami than Mw and depth. The rupture duration gives more information on tsunami impact, Mo/μ, depth and size than Mw and other currently used discriminants. We show more information which known from the rupture durations. The longer rupture duration, the shallower source of the earthquake. For rupture duration greater than 50 s, the depth less than 50 km, Mw greater than 7, the longer rupture length, because Tdur is proportional L and greater Mo/μ. Because Mo/μ is proportional L. So, with rupture duration information can be known information of the four parameters. We also suggest that tsunami potential is not directly related to the faulting type of source and for events that have rupture duration greater than 50 s, the earthquakes generated tsunami. With available real-time seismogram data, rapid calculation, rupture duration discriminant can be completed within 4-5 min after an earthquake occurs and thus can aid in effective, accuracy and reliable tsunami early warning for Indonesia region. © 2012 American Institute of Physics. Source


Buditjahjanto I.G.P.A.,State University of Surabaya
Journal of Theoretical and Applied Information Technology | Year: 2011

Decision-making plays important role for people. Almost every day they must decide a decision to solve their problems. Mistaken in selection a decision makes happen to lose in the competition. When the problem is in multi-objective problem, decision-making becomes very complicated. In this paper, the objective is to build an intelligent agent to help the decision maker or the player with a decision support while playing a serious game in economic and emission dispatch problem. This intelligent agent is constructed by two stages; the initial stage is multi-objective optimization problem that uses NSGA2 method. In this stage, NSGA2 results some optimal solutions. The next stage is clustering to cluster optimal solutions from first stage to be a small number of solutions. In this stage, we evaluate two clustering methods such as FCM, and FLVQ to accomplish the best method for build an intelligent agent which can offer several optimal solutions to the decision maker or the player. © 2005-2011 JATIT & LLS All rights reserved. Source

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