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Articles by Sudradjat Supian
Total Records ( 9 ) for Sudradjat Supian
  Sudradjat Supian , Oscandar Fahmi and Nursamsi Intan
  A mathematical model is a description of a system that uses mathematical concepts and language. The process of developing a mathematical model called mathematical modeling. Mathematical models are used not only in the natural sciences and engineering disciplines but also in social sciences (such as economics, psychology, sociology and political science, medical and dentistry) used a mathematical model that is most widespread. A model may help to explain the system and to study the effects of different components and to make predictions about the behavior. Mathematical models can take many forms including but not limited to dynamical systems, statistical models, differential equations or game theory models. In general, the mathematical model can include logical models as far as logic is taken as a part of mathematics. This research design a mathematical model of the palatine rugae subras deuteromelayu with a mathematical model approach fingerprints. Rugae palatine is an organ that has the unique properties of each individual person, palatine rugae can be analyzed through the number, length, direction and shape. The uniqueness of every shape and pattern of the palatine rugae can be used as the basis for the identification of individuals.
  Chay Asdak and Sudradjat Supian
  The assessment of important factors affecting runoff and erosion was carried out by collecting runoff and soil loss from runoff/erosion plots. The runoff/erosion plots were set up in sloping areas of about 40% slope in two different places of the upper parts of Citarum and Cimanuk Watersheds, West Java, Indonesia. The plots (6×10 m) at the upper Citarum were established in the following four sets of conditions: bamboo garden, mixed garden, small shrub and agricultural crops with different species and stand structures. After 20 rainfall events, a treatment in the form of removing undergrowth and litter were applied to bamboo and mixed garden plots. The results of this before and after treatment are the following: runoff from bamboo garden was increased from 0.40-1.02 L/m2 and erosion was increased from 1.47-11.65 g/m2. While the runoff and erosion in mixed garden were increased from 0.36-1.65 L/m2 and from 1.36-10.88 65 g/m2, respectively. When this compared to the runoff and soil loss in the agricultural plot, the soil erosion is much higher, 50.5 65 g/m2 (about 50 times higher). These results will then be compared to the similar field-plot based measured in the upper Cimanuk watershed for a comparative study purpose. For both cases, stand/canopy structure appeared to be the important factors that determine the magnitude of soil erosion. While the role of these factors were less significant compared to rainfall in determining the magnitude of runoff.
  Pramono Sidi , Mustafa Mamat , Sukono and Sudradjat Supian
  The impact of the financial economics of damage to buildings caused by natural disasters flooding from year to year has been increasing. Thus, the role of insurance companies is one of the important things and periodically they evaluate the large proportion of the premiums charged to insurance participants. In this study, the model calculation and evaluation of insurance premiums as the main component in flood risk management was analyzed. The analysis begins with determining the annual average of the compensation index, calculate the premium per unit of insurance on the basis of parameters of disparate and then determine the proportion of premiums, reserves as well as reinsurance in order to meet payment of the amount of the claims when losses houses damaged by the floods occurred. The case study was carried out on the flood disaster in the Citarum watershed in Southern Bandung, Indonesia. The analysis showed that the greater the initial backup along with an increase in quotas on reinsurance during the period before the disaster and the increase in the value of premiums, all of these strategies can form a scheme whereby the insurance company to cover the financial losses caused by floods.
  Sudradjat Supian , R. Sudrajat , Eman Lesmana and Amalia Farida
  A problem to allocate n number of employees in a directorate/division into a given set of organizational shifts is the Employee Timetabling Problem (ETP). The main purpose of employee timetabling in this research is the allocation of n employees who should be assigned each day so that no idle workers. To solve the ETP and the main purpose of this research in create mathematical modeling represented 0-1 Integer Linear Programming (ILP) Model. The ETP is solved by considering two criteria as the constraints, there are the organizational rules and employee’s requirement with the objective function that is to minimize the number of employees to minimize labor costs. About 0-1 ILP Model obtained from process organization data input and employee data input. Employee data input can be done manually or automatically from database with the help of Software Excel. The 0-1 ILP Model solved by framework SCIP optimization suite which then implemented into application of ETP simulation that are developed by Software Microsoft Visual Studio.
  Yuyun Hidayat , Subiyanto , Mohammad Fadhli Ahmad , Mustafa Mamat , Aceng Sambas and Sudradjat Supian
  In this study, the formula of longshore sediment transport rate is applied to identify shoreline evolution around of runway platform of Sultan Mahmud Airport, Kuala Terengganu, Malaysia. This formula was developed based on phenomena of fluid movement through the sediment particle. The sediment with high permeability become more loose, this causes sediment easily to move. Based on the simulation result by using this formula, shoreline profile around this airport occur an erosion and accretion. The accretion occurs on the north side of this airport. The average accretion in this area during the 1 year is 4.75 and 23.56 m during 3 years. The erosion occurs on the south side of this airport. The average erosion in this area during 1 year is 5.43 m while the erosion becomes worst when the simulation is done for 3 years that is equal to 20.21 m. It is required an effective coastal management and coastal protection in order to minimize this erosion in the future.
  Sukono , Pramono Sidi , Dwi Susanti and Sudradjat Supian
  This study will discuss the problems of quadratic investment portfolio without a risk-free asset based on value-at-risk. It is assumed that the risk of an investment portfolio measured by value-at-risk. The resolution of problems that do include: first, formulate models the trade-off problem. Secondly, formulate expectation maximization model of the problem. Third, formulate model minimization of value-at-risk problem. Based on the results of the discussions can be concluded that the trade-off between risk and expected return does not only depend on the type of investor but also on the size of the investment. In a realistic investment situation, it is likely that more constraints, e.g., restriction on short-selling, need to be considered.
  Mochamad Suyudi , Mustafa Mamat , Sukono and Sudradjat Supian
  The cutwidth minimization problem consists of finding a linear layout of a graph so that, the maximum linear cut of edges (i.e., the number of edges that cut a line between consecutive vertices) is minimized. This study, starts by reviewing previous exact approaches for special classes of graphs as well as a linear integer formulation for the general problem. We propose a branch and bound algorithm based on different lower bounds on the cutwidth of partial solutions.
  Julita Nahar , Sri Purwani , Sudradjat Supian and Fatimah Khonsa Syahidah
  Development of a developing country is essentially aimed at improving the welfare and prosperity of its people. National or regional development puts more emphasis on development in the economic field. In the implementation of their economic development factors that influence it should be considered. One measure of the success can be seen from the economic growth. In modeling the economic growth we are often constrained by models that do not meet the assumptions, one of which is multicollinearity. This occurs because the data obtained is taken from uncontrollable circumstances. The existence of these cases can cause difficulty in separating the influence of each independent variable on the response variable, so, we need a method to solve it. One method that can be used is Principal Component Regression (PCR). PCR is one method that has been developed to overcome the problem of multicollinearity. PCR is a regression analysis of the variables in response to the principal components that are not correlated with each other, where each principal component is a linear combination of all predictor variables.
  Herlina Napitupulu , Ismail Bin Mohd , Sukono , Sudradjat Supian and Nurfadhlina Abdul Halim
  Global optimization problem still become an interest because of the challenge on finding global minimizer(s) of nonlinear objective function with multiple local minima. In this study, the parameter free filled function method is proposed. The algorithm method is combination of parameter free filled function Newton’s method and steepest descent method. Algorithm method is implemented to two and three-dimensional benchmark test functions. The numerical performance shows that the method succeeds on solving unconstrained global optimization problem.
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