Bandung, Indonesia

Parahyangan Catholic University
Bandung, Indonesia

Universitas Katolik Parahyangan or Parahyangan Catholic University is a private university in Bandung, Indonesia. It is one of the oldest private universities in Indonesia. Wikipedia.

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Wong H.,University of Aarhus | Lesmono D.,Parahyangan Catholic University
International Journal of Production Economics | Year: 2013

This paper presents a formal approach to evaluate the value of enhancing product customization in a vertically differentiated market. Different from most existing studies that tend to associate the level of customization with the number of product variants, we take a rather different view to the level of customization which we define as the degree to which consumers are involved along the value chain. Consequently, a higher level of customization is achieved when consumers are involved further upstream in the chain. The novelty of our approach stems from the integration of both marketing- and production-related factors that enable us to: consider trade-offs between customization, lead times and manufacturing costs; and analyze how these trade-offs should be addressed in a market in which one group of consumers is highly concerned about product customization, whereas the other group is more concerned about lead time. Through numerical examples, we demonstrate how the interplay between marketing- and operation-related factors affects firm's decision on the most appropriate level of customization. © 2013 Elsevier B.V. All rights reserved.

Wibowo A.,Parahyangan Catholic University | Mohamed S.,Griffith University
International Journal of Project Management | Year: 2010

Public-private-partnership (PPP) infrastructure projects typically involve a plethora of risks. Given that many risks which are traditionally borne by the government get transferred to the private sector, careful risk allocation is considered to be the key to successful PPP projects. This paper focuses on the current risk allocation practice within Indonesia's water supply projects. The paper captures, presents and discusses the perceptions of both regulators and operators in the context of project risk criticality and allocation. Both parties consider non-availability of raw water is of paramount concern. However, survey findings highlight low-to-moderate levels of intra-group and inter-group agreement regarding the allocation of specific project risk factors. Thus, asserting that the issue of optimal risk allocation remains elusive. © 2009 Elsevier Ltd and IPMA.

Susanto S.,Parahyangan Catholic University | Bhattacharya A.,Dublin City University
Computers and Industrial Engineering | Year: 2011

This paper models a crisp Linear Programming (LP) as a Compromise Fuzzy Multi-Objective LP (CFMOLP). The application of CFMOLP has been focused on an industrial engineering problem that seeks profit maximisation by optimising product-mix. Imprecision of the large volume of industrial data and the conglomerated decision from all levels of management lead fuzzication of the identified constraints and the objective functions as well. The crisp model described is in the form of crisp-Multi-Objective Linear Programming (MOLP) with objective functions, functional constraints and non-negativity constraints. This model is formulated as a fuzzy-MOLP and subsequently converted into an equivalent compromise-MOLP model. The paper describes the development process for the CFMOLP model and its application along with appropriate interpretation. © 2011 Elsevier Ltd. All rights reserved.

Van Kreveld M.,University Utrecht | Wiratma L.,Parahyangan Catholic University
GIS: Proceedings of the ACM International Symposium on Advances in Geographic Information Systems | Year: 2011

For a set of "similar" trajectories, a median trajectory is a trajectory that is most like the trajectories in the set, but it need not be a trajectory from the set itself. A recent method composed a median from parts of the set of trajectories, using ideas from homotopy to decide which parts to use. That method has two drawbacks. Firstly, it requires a significant subset of the trajectories to be homotopic, and such a subset may not always exist. Secondly, it sometimes misses relevant parts of trajectories because homotopy does not characterize the shape of the trajectories in all situations. In this paper we present a new approach to overcome these two drawbacks, leading to majority medians. We give results from extensive experiments, which indicate that majority medians are indeed better than homotopic medians. © 2011 ACM.

Widjaja B.,Parahyangan Catholic University
Incorporating Sustainable Practice in Mechanics of Structures and Materials - Proceedings of the 21st Australian Conference on the Mechanics of Structures and Materials | Year: 2011

This paper is intended to describe the characteristic, rheology model and elucidation of notorious mass wasting type called mudflows. Its soil composition is mainly saturated fine material. Mudflows classifications are still under research. The important factors in those classifications are velocity and soil composition. Many researchers reported that the initiation may be soil saturation when natural water content is about or above its liquid limit. Mudflow behavior is always difficult to predict. Thus, to predict its initiation, transportation and deposition, a certain analysis is needed. The conventional slope stability analysis could not give a solution for mudflows. The important soil model and rheology of mudflows are Mohr-Coulomb's and Bingham's model, respectively.A finite difference program called Flo2d is used to back analyze mudflow deposition in Neihu area, Taiwan. The general result shows that viscosity and yield stress govern its transportation and its deposition. © 2011 Taylor & Francis Group, London.

Siahaan H.M.,Parahyangan Catholic University
International Journal of Modern Physics D | Year: 2015

In this paper, we show the instability of a charged massive scalar field in bound states around Kerr-Sen black holes. By matching the near and far region solutions of the radial part in the corresponding Klein-Gordon equation, one can show that the frequency of bound state scalar fields contains an imaginary component which gives rise to an amplification factor for the fields. Hence, the unstable modes for a charged and massive scalar perturbation in Kerr-Sen background can be shown. © World Scientific Publishing Company.

Siahaan H.M.,Parahyangan Catholic University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2016

By neglecting the self-force, self-energy, and radiative effects, it has been shown that an extremal or near-extremal Kerr-Newman black hole can turn into a naked singularity when it captures charged and spinning massive particles. A straightforward question then arises: do charged and rotating black holes in string theory possess the same property? In this paper we apply Wald's gedanken experiment, in his study on the possibility of destroying extremal Kerr-Newman black holes, to the case of (near-)extremal Kerr-Sen black holes. We find that feeding a test particle into a (near-)extremal Kerr-Sen black hole could lead to a violation of the extremal bound for the black hole. © 2016 American Physical Society.

Siahaan H.M.,Parahyangan Catholic University
European Physical Journal C | Year: 2016

The discussions of Hawking radiation via tunneling method have been performed extensively in the case of scalar particles. Moreover, there are also several works in discussing the tunneling method for Hawking radiation by using higher spins, e.g. neutrino, photon, and gravitino, in the background of static black holes. Interestingly, it is found that the Hawking temperature for static black holes using the higher spins particles has no difference compared to the one computed using scalars. In this paper, we study the Hawking radiation for a spherically symmetric and time dependent black holes using the tunneling of Dirac particles, photon, and gravitino. We find that the obtained Hawking temperature is similar to the one derived in the tunneling method by using scalars. © 2016, The Author(s).

Siahaan H.M.,Parahyangan Catholic University
Classical and Quantum Gravity | Year: 2016

We extend the conjectured Kerr/CFT correspondence to the case of extremal Kerr black holes immersed by a magnetic field, namely the extremal Melvin-Kerr black holes. We compute the central charge which appears in the associated Virasoro algebra generated by a class of diffeomorphisms that satisfies a set of boundary conditions in the near horizon of an extremal Melvin-Kerr black hole. Our results support the Kerr/CFT conjecture, where the macroscopic Bekenstein-Hawking entropy for an extremal Melvin-Kerr black hole matches the result obtained from a dual 2D CFT microscopic computation using Cardy formula. Interestingly, the dual CFT description could be non-unitary, due to the possibility of negative central charge. © 2016 IOP Publishing Ltd.

Rahardjo P.P.,Parahyangan Catholic University
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

Mud eruption occured in East Java, 3 days after the Jogyakarta Earthquake in May 26, 2006 where at the site, deep drilling was being conducted. The mechanism of the causes of the eruptions are still in debate, whether trigerred by the drilling or pressurised fluid reactivated by the quake. However the objectives of this paper is to discuss mainly on the geotechnical aspects of the mud eruption which spread in larger area until today. In the early days of eruption, as much as 150,000 cubic meters discharge per day was reported, although presently only less than 5000 cubic meters of the discharge is estimated. Due to unknown characteristics of the mud, dykes were constructed to contain the mud and the areas being much larger to reach 450 hectares in 2006 and becoming larger in 2007. The location of the disaster is just in the middle of the town of Porong in the district of Sidoardjo, where the Surabaya International airport is located and has block the major arterial roads from north to south of east Java. The soil condition of the site is deep soft clays which causes instability of the dykes. Some dyke failures occured which endangered the residential areas due to the flow of the mud. This paper desscribe the characterics of the soil conditions from a number of drillings and CPTu conducted by the author for design of the replacement of the arterial road, west of the site. The paper discuss the geotechnical problems of land subsidence in large areas and differential settlement that causes damages of the infrastructures, including the roads, gas pipes, railways, the bridges and the buildings. The mud has been discharged through the Porong river, and the sedimentation is being part of the problems.

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