Yogyakarta, Indonesia

Atma Jaya University, Yogyakarta

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.

Adiningrum C.,Atma Jaya University, Yogyakarta | Hadihardaja I.K.,Bandung Institute of Technology
IOP Conference Series: Earth and Environmental Science | Year: 2017

Some rivers located on a flat slope topography such as Cilemahabang river and Ciherang river in Cilemahabang watershed, Bekasi regency, West Java are susceptible to flooding. The inundation mostly happens near a barrage in the middle and downstream of the Cilemahabang watershed, namely the Cilemahabang and Caringin barrages. Barrages or gated weirs are difficult to exploit since the gate must be kept and operated properly under any circumstances. Therefore, a reliability analysis of the gates operation is necessary to determine the performance of the barrage with respect to the number of gates opened and the gates opening heights. The First Order Second Moment (FOSM) method was used to determine the performance by the reliability index (β) and the probability of failure (risk). It was found that for Cilemahabang Barrage, the number of gates opened with load (L) represents the peak discharge derived from various rainfall (P) respectively one gate with opening height (h=1m) for Preal, two gates (h=1m and h=1,5m) for P50, and three gates (each gate with h=2,5m) for P100. For Caringin Barrage, the results are minimum three gates opened (each gate with h=2,5 m) for Preal, five gates opened (each gate with h=2,5m) for P50, and six gates opened (each gate with h=2,5m) for P100. It can be concluded that a greater load (L) needs greater resistance (R) to counterbalance. Resistance can be added by increasing the number of gates opened and the gate opening height. A higher number of gates opened will lead to the decrease of water level in the upstream of barrage and less risk of overflow. © Published under licence by IOP Publishing Ltd.

Ai T.J.,Atma Jaya University, Yogyakarta | Wigati S.S.,Atma Jaya University, Yogyakarta
IOP Conference Series: Materials Science and Engineering | Year: 2017

As one of the most active volcano in the earth, Mount Merapi is periodically erupted and it is considered as a natural disaster for the surrounding area. Kabupaten Sleman as one of the nearest location to this mount has to be always prepared to this disaster. The local government already set three different groups of region, in which potentially affected by Mount Merapi eruption, called KRB I, KRB II, and KRB III. Region KRB III is the closest area to the mount crater and most often affected by the eruption disaster. Whenever KRB III is affected, people live in that area usually being transfer to the next region set that is KRB II. The case presented in this paper is located at the KRB II region, which is the second closest region to the mount crater. A humanitarian distribution system has to be set in this region, since usually this region is became the location of shelters for KRB III population whenever a 'big' eruption is happened. A mathematical model is proposed in this paper, for determining the location of distribution center, vehicle route, and the amount of goods delivered to each customer. Some numerical illustration are presented in order to know the behavior of the proposed model. © Published under licence by IOP Publishing Ltd.

Depari C.D.A.,Atma Jaya University, Yogyakarta
IOP Conference Series: Earth and Environmental Science | Year: 2017

In its concern for human safety, the Government's policy to relocate those living in disaster prone areas is twofold: it is perceptibly profound yet socially cataclysmic. This anomaly, created by the contradiction between the need for sustainability and the fact of vulnerability, could be found in the case of Mount Merapi. Communities living in the hazardous zone of Merapi, particularly those in Glagaharjo Village, are acknowledged for their persistent rejection of relocation programs despite their high exposure to the catastrophic impacts of eruptions. To mitigate the impacts, a safe and conducive dwelling place which considers the characteristics of these affected communities must be encouraged. This research adopts a consensus method towards responses obtained through a Likert scale-questionnaire and measured with a statistical program. Prior this process, theoretical reviews toward the concept of place attachment, place dependence and place identity was established in order to determine the research variables for the questionnaire. © Published under licence by IOP Publishing Ltd.

Wibowo A.P.,Atma Jaya University, Yogyakarta
ARPN Journal of Engineering and Applied Sciences | Year: 2017

Styrofoam concrete in this paper is a concrete that made from aggregates that derived from waste pieces of styrofoam as a substitute for coarse aggregate in order to reduce the weight of the concrete. Volume composition ratio of sand and bits of styrofoam as the fine aggregate is 60:40. Styrofoam concrete has a weight only 1510.86 kg / m3 and can be used as a building wall material. Styrofoam concrete also possesses a waterproof ability, because the water absorption capacity is only 11.97%. © 2006-2017 Asian Research Publishing Network (ARPN).

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.

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.

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