Yogyakarta, Indonesia

Atma Jaya University, Yogyakarta

www.uajy.ac.id
Yogyakarta, Indonesia

Universitas Atma Jaya Yogyakarta is a university in Yogyakarta, Indonesia, which was affiliated with the Universitas Katolik Indonesia Atma Jaya in Jakarta. It was established on 27 September 1965 by the Yogyakarta branch of the Atma Jaya Catholic University Institute of Indonesia. The founders of the University were R.A. Soehardi, A.J. Liem Sioe Siet A., Sutijoso, Oey Liang Lee and Leo Sukoto. Originally an extension of the Universitas Atma Jaya in Jakarta, it became an independent University under the auspices of the Slamet Rijadi Foundation on 31 August 1973. The University originally borrowed classrooms from the IKIP Sanata Dharma, now the Universitas Sanata Dharma, until the University's own campus buildings, located at Mrican Baru Street, were finished in 1980.Growing student numbers led to the Faculty of Engineering and the Administration department being moved to a new building in Babarsari Road in 1990, in conjunction with the celebrations of the silver anniversary of the founding of the University. In 1995, the Economics Faculty and the Postgraduate Program moved into a new building beside the existing building in Babarsari Road. In 2005 a new building was built adjacent to the Faculty of Engineering and the Administration department to host the Faculty of Social and Political Science. The University also acquired the former BHS Bank building to host administrative department. A new integrated library 4 story building has been built next to the Faculty of Social and Political Science building. It will host library and Information Systems Center. The Library building is officially open in a mass led by Mgr. Ignatius Suharyo on October 2009.In late 2010, an additional project to build new building was started. It is planned as an additional to the existing Faculty of Social and Political Science Building. The new building is situated on the east of the current building.The motto of the University is "Servien in lumine veritatis" .The Rector for 2007-2011 period was Prof. Dr. Dibyo Prabowo, M.Sc with 3 vice rectors Dr. A. Koesmargono , Mr Luddy Indra Purnama , and Mr A. Siswanto as acting vice rector for Students, Alumni, and Cooperation. In early 2009, Mr. A. Siswanto was replaced by Mr Hestu Cipto Handoyo, the position vice rector for Students, Alumni, and Cooperation became permanent .On 19 August 2009 Prof. Dr. Dibyo Prabowo, M.Sc. died after a week in hospital due to a heart attack. Dr. A. Koesmargono was appointed as acting rector. Eventually, Dr. Koesmargono is elected as rector after defeating 2 other candidates in an election. Dr Koesmargono will serve as rector for the remainder of Prof. Dibyo Prabowo's term . Professor Yoyong Arfiadi is appointed vice rector to fill position left vacant by Dr. Koesmargono.In December 2010, Rector election is held. There are two candidates, Dr Koesmargono and Dr. R. Maryatmo, MA . The University's Senate will vote for 2011-2015 Rector on December 16, 2010.UAJY is one of the 50 most promising university and one of the best six universities in Indonesia in term of quality assurance according to Directorate of Higher Education, Department of National Education. Wikipedia.

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Hatmoko J.T.,Atma Jaya University, Yogyakarta | Suryadharma H.,Atma Jaya University, Yogyakarta
Procedia Engineering | Year: 2017

Expansive soil is widespread all over the world, also in Indonesia. Its existence results on damage of building structures due to its low strength and high expansion. As a result, improvement of this soil is extensively investigated and continually in progress. Calcium carbide residue (CCR) is a hazardous waste produced from burning acetylene. It contains high CaO, then it is considered to be an admixture to reduce the plasticity index, expansion potential as well as to increase shear and compressive strength of expansive soil. Whereas bagasse ash (BA) is a fine residue collected from the burning of bagasse in sugar factory. This research was undertaken to improve the physical and mechanical behavior of expansive soil stabilized with CCR and BA, and it was done in two steps. The first step was the improvement of the physical and mechanical behavior of expansive clay by adding calcium carbide residue (CCR) to the original soil. The result indicates that at 8% CCR, plasticity index and potential pressure of expansive clay was significantly reduced, and unconfined compressive strength of stabilized soil increased. Then, standard compaction, unconfined compression and direct shear tests were carried out on soil + 8% CCR + bagasse ash (BA). The variation in BA was 0, 3, 6, 9, and 12%, and each specimen was cured on 7, 14, 21, 28 and 36 days of curing time. The study indicates that at 9% of BA and on 28 day-curing time, the MDD and unconfined compressive strength were significantly increased. Moreover, addition of bagasse ash on CCR soil mixture improves soil ductility. © 2017 The Authors.


Arfiadi Y.,Atma Jaya University, Yogyakarta
Procedia Engineering | Year: 2017

This paper considers nonlinear control of buildings utilizing composite tuned mass dampers subject to earthquake. Basically composite tuned mass dampers are tuned mass dampers having two dampers connected in series, where auxiliary mass dampers as satellite damper is attached on the first dampers. The properties of composite tuned mass dampers are optimized before they are used in the structures. Active control systems are then applied to the composite tuned mass dampers. Because the magnitude of control force is not unlimited, the maximum energy to be supplied to the building should be bounded within the actuator's capacity. Several combinations of active control locations are investigated, i.e., two controllers at both dampers, one controller at first damper only, and one controller at the second damper only. Continuous bounded control algorithms utilizing continuous function are used as the control algorithms in this paper. From the numerical simulations, it is found that the best result is obtained when both control forces are applied to the mass dampers. In the case that only one actuator is used, better performance is achieved when the control force is applied at the first (bottom) damper. © 2017 The Authors.


Bhimasta R.A.,Atma Jaya University, Yogyakarta | Suprapto B.,Atma Jaya University, Yogyakarta
ACM International Conference Proceeding Series | Year: 2016

Faculty of Economics in Universitas Atma Jaya Yogyakarta (UAJY) has replaced printed textbooks with e-textbooks for its academic activities since 2015. These e-textbooks can be accessed via iPad which is given to each student. Hence, the objective of this study is to test the proposed research model based on integrated UTAUT2 and TTF. Questionnaires were distributed to 326 students in 10 classes. Only junior and sophomore students were eligible to fulfill the questionnaires. The result of the study shows that performance expectancy, effort expectancy, social influence, facilitating condition, and habit have a direct significant relationship on behavioral intention to use mobile e-textbook. The result also shows that both Task technology and technology characteristic positively affect task technology fit. There is also a direct significant relationship between Task technology fit and performance expectancy. We suggest that further studies include experimentation to investigate performance expectancy of mobile e-book. 2) More evaluation should be held in the future in more mature environment. The finding of this study can help policymakers in the Faculty of Economics UAJY to evaluate the policy and formulate better strategy. In addition, these findings can be used by others faculties and universities as mobile etextbook adoption case reference. © 2016 ACM.


Lisantono A.,Atma Jaya University, Yogyakarta
Computers and Concrete | Year: 2013

A nonlinear finite element analysis of R/C hybrid deep T-beam with web opening subjected to pure torsion is presented. Hexahedral 8-nodes and space truss element were used for modeling concrete and reinforcement. The reinforcement was assumed perfectly bonded to the corresponding nodes of the concrete element. The constitutive relations for concrete and reinforcement are based on the modified field theory and elastic perfectly plastic. The smear crack approach was adopted for modeling the crack. The torque-twist angle relationship curve based on the finite element analysis was compared to the experimental results. The comparison shows that the curve of torque-twist angle predicted by the nonlinear finite element analysis is linear before cracking and close to the experimental result. After cracking, the curve becomes nonlinear and stiffer compared to the experimental result. Copyright © 2013 Techno-Press, Ltd.


Frans R.,Atma Jaya University, Yogyakarta | Arfiadi Y.,Atma Jaya University, Yogyakarta
Procedia Engineering | Year: 2014

Structural optimizations have received great attention from structural engineers. Several optimization methods have been proposed including evolutionary strategies and genetic algorithms. This paper considers hybrid genetic algorithms for roof truss optimizations. Practically, roof truss optimizations are unique. In this case, the pitch angles are usually governed by roof covering types. In the optimization process, the pitch angle is set to constant, while the coordinates of the joints are determined by genetic algorithms. The optimization process utilizes hybrid genetic algorithms, i.e., a combination of binary and real coded genetic algorithms. Genetic algorithms are optimization methods that have been used successfully for various problems. For the sizing, shape and topology optimizations considered in this paper, the area of cross section and the number of members connected to every node are optimized using binary coded genetic algorithms, while the coordinates of the nodes are determined using real coded genetic algorithms. The optimization process for binary and real coded algorithms is done subsequently. The use of real coding for joint coordinates of structures gives the program the flexibility to obtain the final position of the joints. The arithmetic crossover is used to tackle this matter. In every generation, a portion of new individuals is inserted randomly replacing the old individuals. This can be considered to increase the variability of the population. In addition, the fittest individual is always transferred into the next generation. The penalty to the individuals that are violating the constraint is set to a minimum fitness in this paper. It can be shown that the proposed procedure is able to obtain the optimum design of roof truss structures. © 2014 The Authors. Published by Elsevier Ltd.


Binarti F.,Atma Jaya University, Yogyakarta | Satwiko P.,Atma Jaya University, Yogyakarta
Energy Procedia | Year: 2015

A poorly lit interior due to high external obstruction from the neighbourhood is a common problem in dense urban settlements. To improve the daylighting performance; meanwhile, to maintain its thermal performance of a living room in a tropical urban house, an anidolic daylighting system (ADS) was applied on the east facade. Long-term monitoring and simulations were conducted before and after the ADS installation to assess the room's daylighting and thermal performance. The living room's daylight levels and the daylighting glare probability (DGP) were analyzed using Radiance and Evalglare based lighting simulation softwares. Design Builder was employed to observe the thermal impact of the application. Whereas, the long-term monitoring of the ADS performance covered field measurements of the living room's daylight levels, DGP, air temperature, relative humidity and ADS collector's surface temperature before and after the ADS installation. Long-term monitoring and simulation results prove that ADS is a promising solution for daylighting problems in tropical regions. It convincingly improved the daylight levels within the imperceptible glare range without the increasing of the indoor air temperature. © 2015 The Authors.


Frans R.,Atma Jaya University, Yogyakarta | Arfiadi Y.,Atma Jaya University, Yogyakarta
Procedia Engineering | Year: 2015

Reducing vibration of buildings during earthquake is of the primary concern to most structural engineers. Several methods have been proposed including the use of damper systems. This paper considers the optimization procedures of multi tuned mass damper (MTMD) systems. A number of researches have considered designing MTMD systems to reduce structural response during earthquake. However, most of the research considered only the properties of the MTMD, while the locations of MTMD are decided beforehand. This paper considers the optimization both the properties and location of MTMD in structures. The hybrid coded genetic algorithms (HCGAs) are used to optimize the dampers. The HCGAs are the optimization method that utilize binary coded GAs (BCGAs) and real coded GAs (RCGAs). The RCGAs are used to optimize the properties of MTMD, while the BCGAs are utilized to optimize the location of the dampers. Numerical examples are then carried out to see the ability of the proposed method in optimizing the locations and the properties of the dampers. Numerical examples are carried out to a three, ten-, and forty-story buildings. For the three- and ten-story buildings, the location of the MTMD is obtained at the top of the buildings, whereas for forty-story building the location of the dampers is depending on the mass ratio of the dampers. For 1% mass ratio, the locations of the dampers, are at the 39th and 40th floors, respectively. For 2% mass ratio, the dampers locations are obtained at the 38th and 40th floor, respectively; while for 4% mass ratio, the dampers locations are at 37th and 40th floors, respectively. Numerical simulations show the effectiveness of MTMD systems in reducing response of structures due to earthquake. © 2015 The Authors. Published by Elsevier Ltd. Published by Elsevier Ltd.


Hatmoko J.T.,Atma Jaya University, Yogyakarta | Suryadharma H.,Atma Jaya University, Yogyakarta
Procedia Engineering | Year: 2015

The research was conducted to predict the potential liquefaction that may happen on some areas in Bantul regency the province of Special Region of Yogyakarta. To verify soil profile and N-SPT values, soil exploration was done on 4(four) selected locations in Bantul regency. The field exploration was then followed by some laboratory experiments in regard to physical and mechanical properties of soil. The results of soil exploration indicates that soil deposit is sand from the ground surface up to the depth of 30, 00 meter, low to medium N-SPT values ( 15 < N <30), and high elevation of ground water level ( -5.00 to -9.00). Laboratory tests show that the soil is uniform poorly graded sand with Cu < 3, and Cc < 2, and relatively low internal friction angle in between 24° and 31°. The soil data, then analysed by means of the method developed by National Centre of Earthquake Engineering Research (NCEER). Analysis of potential liquefaction for 4 selected locations, during low accelerated earthquake (amax/g = 0.05) there were no liquefaction zone. However, during Yogya earthquake 2006 (amax/g = 0.09) there were liquefaction zone in between 17.00 to 19.00 that was very short and in the depth far below ground level. And at amax/g = 0.15 there were long liquefaction zone from 4.00 to 30.00 meter below ground surface. © 2015 The Authors. Published by Elsevier Ltd.


Brata A.G.,Atma Jaya University, Yogyakarta
Theoretical and Empirical Researches in Urban Management | Year: 2010

This study has been focusing on the vulnerability of street vendors in Java since the time when Java was hit severely by the economic crisis in 1997/1998, which also had reversed the trend of economic formalization in Indonesia. For this aim, a survey was conducted during the month of February 2007 in Yogyakarta and Sleman districts in Yogyakarta Special Province. The survey covered 122 street vendors in several streets in both areas. These samples consist of three groups of street vendors: food seller, non-food seller, and services providers. Based on this survey, vulnerability index of street vendors is measured. The study found that most of street vendors in Yogyakarta experience vulnerability at the medium level. In general, vulnerability of food seller vendors is higher than other vendors. Vulnerability also varies across the locations of vending.


Binarti F.,Atma Jaya University, Yogyakarta | Satwiko P.,Atma Jaya University, Yogyakarta
Indoor and Built Environment | Year: 2016

Sustainable core daylighting is expected to provide comfortable and healthy daylight in dense urban areas. One system, an anidolic daylighting system is a promising solution, however, it is still not widespread because of several complications. This paper presents an application of an affordable anidolic daylighting system on a tropical urban house designed with a simple edge-ray approach. This approach has created a parabolic collector for east-facing (azimuth 85°) anidolic daylighting system to improve the daylighting level of a room with high external obstruction. Simulation results and short-term monitoring before and after the construction have indicated successful application of an anidolic daylighting system for improving daylighting performance, especially before 13:00, without increasing indoor air temperature. The results have shown a strong hourly illuminance profile. To improve the indoor illuminance after 13:00 and the hourly illuminance profile, an east-facing anidolic daylighting system collector can be combined with a west-facing collector. © 2016 The Author(s).

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