Atma Jaya Catholic University of Indonesia
Jakarta, Indonesia

Atma Jaya Catholic University of Indonesia is an institute of higher learning in Jakarta, Indonesia, which was founded by Atma Jaya Foundation on June 1, 1960. The main campus is located at Semanggi area, South Jakarta and the other campus is located in Pluit, North Jakarta.According to a survey by GlobeAsia Magazine in 2008 Atma Jaya was ranked third among all private universities in Indonesia. While the survey of Tempo magazine from 2005 to 2007 put Atma Jaya in the top ten best universities in Indonesia. The General Directorate of Higher Education categorizes Atma Jaya in 50 Promising Indonesian Universities out of 2864 higher education institutions in Indonesia.Since 2008 Atma Jaya has been increasing the number of undergraduate and graduate programs, and is constructing a new campus in Bumi Serpong Damai, Tangerang. Wikipedia.

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Setyanto D.,Atma Jaya Catholic University of Indonesia
Procedia Engineering | Year: 2017

The height crest profile of metal roofing sheets is the common option for Japanese factory buildings in Indonesia. The metal roofing sheets are installed on the supporting bars/ purlins with mechanical locking system without any holes. Based on this system, the paper describes how to design a similar height crest profile of roofing sheets made of a GFRP composite material that is produced in a continuous laminating machine. It was found six types of height crest profiles that are met to the profile that is installed on the purlins by mechanical locking system. The six roofing sheets structures are simulated with uniform static forces on the two local areas of valley of roofing sheets by using finite element method. Based on both stress and deflection distribution of the six finite element models of roofing sheet structure, the selected type of crest profile is the trapezoidal. The roofing sheets of GFRP material consist of three trapezoidal type crests and two valleys. It was produced in a continuous laminating machine by using seven until twenty rows of mold. A row/ set of mold consist of three parts, one bottom part and two upper parts. © 2017 The Authors.

Sari L.,Atma Jaya Catholic University of Indonesia
Proceedings - IEEE COMNETSAT 2014: 2014 IEEE International Conference on Communication, Network and Satellite | Year: 2014

Rate Compatible Punctured Convolutional (RCPC) code is a sub-class of convolutional code which allows varied levels of data protection to suit different types of data. RCPC is becoming extensively used in telecommunication systems as it offers bandwidth efficiency and simpler hardware implementation compared to convolutional coding, with comparable performance. RCPC codes are attained by puncturing several of the redundancy bits of convolutional codes. As accurate analysis of the bit error probability for a punctured convolutional encoder using state diagram and transfer function is not a straightforward process, in this paper we use nonpunctured equivalent convolutional code to represent the punctured code. There are numerous puncturing patterns to yield RCPC codes from certain convolutional mother code. Our simulation results in AWGN and Rayleigh fading channels show that the same code rates yielded by different puncturing patterns will result in different code performance. Therefore, puncturing pattern is one of the key considerations in generating an RCPC code as it markedly affects the code performance. © 2014 IEEE.

Setyanto D.,Atma Jaya Catholic University of Indonesia
Procedia Engineering | Year: 2014

The characteristics of sheet molding compound (SMC) roof tiles are: lightness, high strength, high stiffness, and corrosion resistance. This paper describes a trial production of SMC roof tiles in a composite manufacturing industry in Tangerang, Indonesia. The SMC roof tiles samples were then characterized and evaluated to determine the mechanical properties of the material and the performance of the roof structure. Mechanical properties of the material, i.e. the tensile strength and the elastic modulus, were obtained from the tensile test. Evaluation of the SMC roof tiles as a roof structure was carried out by static loads testing of the roof structure model. The tensile test according to ASTM D638: 2003 shows that the tensile strength and the elastic modulus of the SMC material are 30 ± 3 MPa and 10 ± 1 GPa, respectively. Failure of the SMC roof tiles as a roof structure when loaded by static load of cylindrical steel loads due to crack occurred at 94 kgs load. © 2014 The Authors. Published by Elsevier Ltd.

Sari L.,Atma Jaya Catholic University of Indonesia
Telkomnika | Year: 2012

Punctured convolutional codes are known to have low complexity compared to their nonpunctured counterpart, while retaining a good performance. Analyzing the performance of punctured convolutional code can be simplified by using non-punctured equivalent code. In this paper new punctured convolutional codes with rates of 3/8, 3/7 and 3/6 are proposed, and their performances are studied by first constructing non-punctured equivalent codes. Simulations results show that different puncturing patterns will affect the code performances. Further investigations show that puncturing adjacent bits is to be avoided as it tends to degrade the code performance, as indicated by a decrease of the free distance by 9% and 33% below average for code rates 3/7 and 3/6 respectively. On the contrary, dispersed punctured bits will yield good code performance as indicated in the increase of the free distance by 27% and 32.45% above average for code rates 3/7 and 3/6 respectively.

Handajani Y.S.,Atma Jaya Catholic University of Indonesia
Acta medica Indonesiana | Year: 2012

to provide an overview of the quality of life (OQL) for people living with HIV/AIDS (PLWHA) in Jakarta, particularly in the Kramat 128 Hospital, based on CD4 and viral load (VL) levels and the length of antiretroviral (ARV) treatment. a cross-sectional study performed at Kramat 128 Hospital Jakarta Outpatient Clinic from November 2010 to January 2011. Quality of life was assessed with the WHOQOL-BREF instrument. The data were analyzed using Chi-Square test, independent T-test, and One-Way Analysis of Variance (ANOVA) test. the mean score in four domains of QOL in descending order were psychological (72.27), physical health (70.10), environment (65.59), and social relationships (64.44). There were a significant differences in overall QOL (p=0.000) and general health (p=0.001) between lower and higher CD4 levels. Patients who were interviewed look healthy physically and psychologically, have a good QOL based on statistical analysis. Patients with undetectable VL levels had better in general health (p=0.012), and those with longer ARV therapy (>1 year) had better overall QOL (p=0.024) and general health (p=0.003). Analysis with four domains of QOL showed a significant relationship of CD4 levels with the physical health (p=0.001) and psychological domain (p=0.043). VL levels showed significant relationships with the four domains of QOL (p<0.05). Duration of ARV therapy showed a significant association only with physical health domain (p=0.015). higher CD4 levels, undetectable VL, and longer ARV therapy will increase patient's QOL. Higher QOL will make the patient have ability to cope with illness. So, a better QOL can be taken as indicator of successful ARV treatment.

In periodontal disease, gingival fibroblasts activated by the Gram-negative anaerobic bacterium Porphyromonas gingivalis induce overexpression of matrix metalloproteinase-2 (MMP-2), which is involved in inflammatory progression. This process is followed by tissue destruction and bone loss. In the present study, we investigated the in vitro effect of the ethanolic Kaempferia pandurata Roxb. extract on expression of MMP-2 in P. gingivalis-treated human gingival fibroblast-1 (HGF-1) cells. In addition, we utilized gelatin zymography, Western blotting, and reverse transcription-PCR analysis to elucidate the molecular mechanisms underlying MMP-2 inhibition via the mitogen-activated protein kinase (MAPK) and cyclic AMP response element-binding protein (CREB) signaling pathways. Treatment with K. pandurata extract (1-10 μg/ml) dose-dependently suppressed the activity, secretion, and protein expression of MMP-2 in HGF-1 cells exposed to P. gingivalis. At the transcriptional level, inhibition of MMP-2 gene expression by K. pandurata was mediated by phosphorylation of c-Jun N-terminal kinase (JNK) and CREB signaling pathways in P. gingivalis-treated HGF-1 cells. These results suggest that K. pandurata extract suppresses MMP-2 expression at the protein and gene levels via downregulation of the principal JNK and CREB signaling pathways. Due to its efficacy in inhibiting MMP-mediated periodontal destruction, K. pandurata might represent a new, potent periodontal therapy.

Arbiyani F.,Atma Jaya Catholic University of Indonesia
ARPN Journal of Engineering and Applied Sciences | Year: 2016

The development of electronics industry in keeping the chip size to be smaller has challenged its thermal management to maintain the maximum chip temperature below 80 °C. The correlation as a method to estimate chip temperature, when only the chip's heat rate or power input and inlet coolant temperature are known, is obtained. The equations involving pressure drop, pool boiling and film condensation characteristics that explain the heat transfer process and flow phenomenon inside the thermosyphon flow are derived to obtain the correlation. A new design of a two-phase thermosyphon water-cooled condenser system as the electronic cooling system has been built to acquire the experimental data. This thermosyphon design uses R-113 as working fluid and water as external coolant condenser (flows through the cooling coil). The condensation occurs as film condensation at the outer of radial water coolant coil. The R-113 liquid condensate will then return back to the evaporator section through the downcomer section by gravity rather than by capillary forces. The thermosyphon system (excluding the water coolant coil section) is thus a passive system, and its evaporator section must be located below the condenser. In the present work, the heat supply component is simulated by a cartridge heater. This cartridge heater is in direct contact with the working fluid. The water coolant condenser is supplied by solution bath. Furthermore, the evaporator, riser, condenser, and downcomer are well insulated and all applied heat is assumed to be transferred through the thermosyphon. In the experiment, the varying mass flow rate and voltage at a constant inlet water temperature ( ) of 10°C, 15°C and 20°C were measured. The correlation obtained as function of heat flux and temperature difference between chip and coolant inlet temperature is valid as they are in good agreement with the experimental results. © 2006-2016 Asian Research Publishing Network (ARPN).

Gideon Manalu F.R.,Atma Jaya Catholic University of Indonesia
Proceedings - 2014 6th International Conference on Information Technology and Electrical Engineering: Leveraging Research and Technology Through University-Industry Collaboration, ICITEE 2014 | Year: 2015

This paper describes the development of Potential Field (PF) method which is implemented in multi cooperative autonomous vehicle with a case study in robotic soccer. This method, called Double Target Potential Field (DTPF), increase the effectiveness of the vehicle movement to achieve the goal of passing the ball and kicking the ball into the goal. This research was conducted by simulating robot movement using Borland Delphi 6.0. There are ten tests which were being done by placing robot and ball in different condition. The test results show this method can effectively direct the ball to the desired target with an accuracy of 85-95% although the time required to achieve a ball is 30-50% longer than usual PF method due to the many movements a vehicle has to take (in order to turn). With this method, planning the movement of each vehicle in a team can be more easily managed in the team strategy module © 2014 IEEE.

Pramudita A.A.,Atma Jaya Catholic University of Indonesia
Proceedings of the 2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2015 | Year: 2015

An Antenna with stable footprint is crucial for GPR system to perform. In regards to the problem of varying soil condition, the design of UWB reconfigurable antenna with footprint adjustment capability was studied as an antenna system for GPR. The antenna system consists of several U-shape micro strip UWB antennas with resistive loading. Reconfiguration of the propose antenna is performed by controlling the switching device which is used to connect each U-shape micro strip UWB antenna. The reconfiguration scheme gives possibility to adjust the antenna footprint by manipulated the effective aperture of the antenna. Larger footprint is generated by increasing the number of U-shape micro strip UWB that are connected to each other and vise versa for smaller footprint. The theoretical analysis has been done to investigate the reconfigurable antenna concept for footprint adjustment and the result shows that the reconfigurable antenna concept is capable to adjust the footprint size of the antenna. © 2015 IEEE.

Yanti,Atma Jaya Catholic University of Indonesia
American Journal of Biochemistry and Biotechnology | Year: 2011

Problem statement: Atherosclerosis is associated with chronic inflammation triggered by bacterial infection that activates the breakdown of extracellular matrix protein by matrix Metalloproteinases (MMPs). Zingiberaceae, a group of tropical food crops grown in Indonesia and other Southeast Asia regions, has been traditionally used for food coloring, seasoning, culinary and medicinal purposes. However, its efficacy as natural vascular protection has not been explored. Approach: The research was aimed to investigate the effects of 10 Indonesian Zingiberaceae rhizome extracts on inhibition of MMP-9 expression in human vascular endothelial cells treated with Lipopolysaccharide (LPS) in vitro by conducting gelatin zymogram, Western blotting and RT-PCR assays. Results: LPS (2 μg mL -1) significantly elevated the expression of MMP-9 secretion, protein and mRNA in the vascular endothelial cells. Selected Zingiberaceae exctracts (5 μg mL -1), i.e., Curcuma xanthorrhiza, C. aeruginosa, C. mangga, C. longa, Kaempferia galanga, Alpinia galangal and Zingiberaceae officinale, effectively attenuated the expression of MMP-9 secretion, protein and mRNA in LPS-induced vascular endothelial cells. Furthermore, MMP-9 expression was specifically blocked by MAPK inhibitors, i.e., PD98059 (ERK1/2 inhibitor), SB203580 (p38 inhibitor), SP600125 (JNK inhibitor) and PI3K inhibitor (LY294002), indicating that MAPK and PI3K signaling pathways are involved in regulation of MMP-9 gene expression in LPS-induced vascular endothelial cells. Conclusion: These results suggest that selected Indonesian Zingiberaceae rhizomes with potent MMP-9 inhibitory activity may scientifically offer the promising therapeutic target in vascular diseases, particularly atherosclerosis. © 2010 Science Publications.

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