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Journal of Engineering and Technological Sciences
Published by Institut Teknologi Bandung
ISSN : 23375779     EISSN : 23385502     DOI : -
Core Subject : Engineering,
Engineering
Journal of Engineering and Technological Sciences welcomes full research articles in the area of Engineering Sciences from the following subject areas: Aerospace Engineering, Biotechnology, Chemical Engineering, Civil Engineering, Electrical Engineering, Engineering Physics, Environmental Engineering, Industrial Engineering, Information Engineering, Mechanical Engineering, Material Science and Engineering, Manufacturing Processes, Microelectronics, Mining Engineering, Petroleum Engineering, and other application of physical, biological, chemical and mathematical sciences in engineering. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere. Starting from Vol. 35, No. 1, 2003, full articles published are available online at http://journal.itb.ac.id, and indexed by Scopus, Index Copernicus, Google Scholar, DOAJ, GetCITED, NewJour, Open J-Gate, The Elektronische Zeitschriftenbibliothek EZB by University Library of Regensburg, EBSCO Open Science Directory, Ei Compendex, Chemical Abstract Service (CAS) and Zurich Open Repository and Archive Journal Database. Publication History Formerly known as: ITB Journal of Engineering Science (2007 – 2012) Proceedings ITB on Engineering Science (2003 - 2007) Proceedings ITB (1961 - 2002)
Arjuna Subject : -
Articles 1,267 Documents
 61   62   63   64   65 
Determining Conjugate Points of An Aerial Photograph Stereopairs Using Separate Channel Mean Value Technique Andri Hernandi; D. Muhally Hakim; Irawan Seomarto; Agung Budiharto; Emalia Emalia
Journal of Engineering and Technological Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.2.4

Abstract

In  the  development  of  digital  photogrammetric  system,  automatic image matching process play an important role. The automatic image matching is  used  in  finding  the  conjugate  points  of  an  aerial  photograph  stereopair automatically.  This  matching  technique  gives  quite  significant  contribution especially  in  the  development  of  3D  photogrammetry  in  an  attempt  to  get  the exact and precise topographic information during the stereo restitution. There are two image matching methods that have been so far developed, i.e. the area based system  for  gray  level  environment  and  the  feature  based  system  for  natural feature  environment.  This  research  is  trying  to  implement  the  area  based matching  with  normalized  cross  correlation  technique  to  get  the  correlation coefficient between the spectral value of the left image and its pair on the right. Based  on  the  previous  researches,  the  use  of  color  image  could  increase  the quality  of  matching.  One  of  the  color  image  matching  technique  is  known  as Separate Channel Mean Value. In order to be able to see the performance of the technique, a number of sampling areas with various different characteristics have been  chosen,  i.e.  the  heterogeneous,  homogeneous,  texture,  shadow,   and contrast. The  result  shows  the  highest  similarity  measure  is  obtained  on  heterogeneous sample area at size of all reference and search image, i.e. (11 pixels x 11 pixels) and   (23  pixels  x  23  pixels).  In  these  area  the  correlation  coefficient  reached more than 0.7 and the highest percentage of similarity measure is obtained. The average of total similarity  measure of conjugate images in the sampling image area  only  reach  about  41.43  %  of  success.  Therefore,  this  technique  has  a weakness and some treatment to overcome the problems is still needed.
Estimation of Bank Erosion Due to Reservoir Operation in Cascade (Case Study: Citarum Cascade Reservoir) Sri Legowo; Iwan K. Hadihardaja; Azmeri Azmeri
Journal of Engineering and Technological Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.2.5

Abstract

Sedimentation  is  such  a  crucial  issue  to  be  noted  once  the accumulated  sediment  begins  to  fill  the  reservoir  dead  storage,  this  will  then influence the long-term reservoir operation. The sediment accumulated requires a serious attention for it may influence the storage capacity and other reservoir management  of  activities.  The  continuous  inflow  of  sediment  to  the  reservoir will decrease the capacity of reservoir storage, the reservoir value in use, and the useful  age  of  reservoir.  Because  of  that,  the  rate  of  the  sediment  needs  to  be delayed as possible. In this research, the delay of the sediment rate is considered based on the rate of flow of landslide of the reservoir slope. The rate of flow of the sliding slope can be minimized by way of each reservoir autonomous efforts. This  effort  can  be  performed  through;  the  regulation  of  fluctuating  rate  of reservoir surface current that does not cause suddenly  drawdown  and upraising as well. The research model is compiled using the searching technique of Non Linear Programming (NLP). The  rate  of  bank  erosion  for  the  reservoir  variates  from  0.0009  to  0.0048 MCM/year, which is no sigrificant value to threaten the life time of reservoir.Mean  while  the   rate  of  watershed  sediment  has  a  significant  value,  i.e:  3,02  MCM/year  for  Saguling  that  causes  to  fullfill  the  storage  capacity  in  40  next years (from years 2008). 
A Substractive Clustering Based Fuzzy Hybrid Reference Control Design for Transient Response Improvement of PID Controller Endra Joelianto; Parlindungan H. Sitanggang
Journal of Engineering and Technological Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.2.6

Abstract

The  well  known  PID  controller  has  inherent  limitations  in  fulfilling simultaneously the conflicting control design objectives.  Parameters of the tuned PID  controller  should  trade  off  the  requirement  of  tracking  set-point performances,  disturbance  rejection  and  stability  robustness.  Combination  of hybrid  reference  control  (HRC)  with  PID  controller  results  in  the  transient response  performances can be independently achieved without deteriorating the disturbance  rejection  properties  and  the  stability  robustness  requirement.  This paper proposes a fuzzy based HRC where the membership functions of the fuzzy logic  system  are  obtained  by  using  a  substractive  clustering  technique.  The proposed  method  guarantees  the  transient  response  performances  satisfaction while preserving the stability robustness of the closed loop system controlled by the  PID  controller  with  effective  and  systematic  procedures  in  designing  the fuzzy hybrid reference control system.
Improved Predictive Power Control Algorithms to Increase CDMA System Capacity A. Kurniawan; Iskandar Iskandar; Sayid Machdar
Journal of Engineering and Technological Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.2.7

Abstract

In  this  paper  capacity  of  CDMA  system  is  evaluated  using  an improved  algorithm  of  channel  prediction-based  power  control  in  Rayleigh fading  channel environments. One  of the most serious problems which degrades the performance of power control algorithm is the effect of feedback delay. To overcome the effect of feedback delay, power control algorithm relies on channel prediction techniques, which utilize the correlation property of the past  channel measurements.  In  CDMA  power  control,  however,  the  correlation  property  of channel  measurements  is destroyed  because the  transmit power  is continuously updated  for  each  power  control  interval.  In  order  to  restore  the  correlation property of the channel,  the past  channel measurements  are compensated  for by the  same  factors  that  were  given  by  power  updating  for   each  power  control interval. The prediction algorithm in this paper is proposed using the least mean square  (LMS) technique. The result shows that the capacity of CDMA systems increase  significantly  when  the  improved  predictive  algorithm  is  used. Numerical evaluation shows that CDMA capacity increases by more than 40 % for fixed step algorithm and more than 50 % for variable step algorithm when the proposed algorithm is employed. 
Model and Controller Order Reduction for Infinite Dimensional Systems Fatmawati Fatmawati; R. Saragih; B. Riyanto; Y. Soeharyadi
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2010.42.1.1

Abstract

This paper presents a reduced order model problem using reciprocal transformation and balanced truncation followed by low order controller design of infinite dimensional systems. The class of systems considered is that of an exponentially stable state linear systems (A, B, C), where operator A has a bounded inverse, and the operator B and C are of finite-rank and bounded. We can connect the system (A, B, C) with its reciprocal system via the solutions of the Lyapunov equations. The realization of the reciprocal system is reduced by balanced truncation. This result is further translated using reciprocal transformation as the reduced -order model for the systems (A, B, C). Then the low order controller is designed based on the reduced order model. The numerical examples are studied using simulations of Euler-Bernoulli beam to show the closed-loop performance.
Adaptive Control with Approximated Policy Search Approach Agus Naba
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2010.42.1.2

Abstract

Most of existing adaptive control  schemes are designed to minimize error  between  plant  state  and  goal  state  despite  the  fact  that  executing  actions that are predicted to result in smaller errors only can mislead  to non-goal states. We develop an adaptive control scheme that involves manipulating a controller of  a  general  type  to  improve  its  performance  as  measured  by  an  evaluation function. The developed method is closely related  to a theory of Reinforcement Learning (RL) but imposes a practical assumption made for faster learning. We assume  that  a  value  function  of  RL  can  be  approximated  by  a  function  of Euclidean distance from a goal state and an action executed at the state. And, we propose  to  use  it  for  the  gradient  search  as  an  evaluation  function.  Simulation results provided through application of the proposed scheme to a pole -balancing problem using a linear  state feedback controller and fuzzy controller verify the scheme's efficacy.
Fabrication of Microporous Water Filter Using Titanium Dioxide Particles, Silica Particles, and Polyethylene Glycol Aris Priatama; Mikrajuddin Abdullah; Khairurrijal Khairurrijal; Hernawan Mahfudz
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2010.42.1.3

Abstract

We report the fabrication of microporous filter for use in filtering both inorganic  and  organic  substances  from  liquid  materials.  Titania  (TiO 2)  anatase was  used  as  the  main  material  for  this  filter.  Polyethylene  glycol  (PEG)  with average  molecular  weight  of  20,000  was  also  used  as  additive  to  control  the formation  of  pores,  especially  pore  sizes.  The  mixture  of  titania  and  PEG  was pressed into cylindrical tablet shape at room temperature  and then simply heated inside a furnace up to temperature where the PEG decomposed into gas to leave only connected titania particles. The use of titania as base material for the filter allows  the  organic  substances  that  trapped  inside  the  filter  pores  to  be  easily removed by heating up the used filter at above decomposition temperature of the trapped  organics.  We  also  made  other  filter  by  adding  small  amount  of  silica (SiO2)  particles  to  reduce  the  size  of  the  pores  as  well  as  to  improve  the mechanical  strength.  We  observed  that  filters  containing  silica  particles,  with smaller  in  size  compared  to  titania,  resulted  in  better  mechanical  strength, smaller in pore sizes and better filtering results in term of turbidity and dissolved oxygen (DO) content. This  method is potential for development of larger scale and cheaper water filters for use in various applications.
Analysis and Minimization of Output Current Ripple of Multiphase Carrier-Based PWM Inverters Pekik Argo Dahono
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2010.42.1.4

Abstract

Analysis  and  minimization  of  output  current  ripple  of  multiphase carrier-based PWM  inverters are presented in this paper.  Analytical expression of rms value of output current ripple of multiphase PWM inverters as a function of the reference signal is first derived. Based on this expression, it is shown that a pure sinusoidal signal is the optimum reference signal that results in minimum output  current  ripple.  Different  to  three-phase  PWM  inverters,  injection  of harmonics  into  the  sinusoidal  reference  signal  is  neither  necessary  nor  useful. The  rms  values  of  output  current  ripple  of  5-,  7-,  and  9-phase  PWM  inverters under various reference signals are compared. Experimental results are included to show the validity of the analysis method.
Geochemical Tracer in Coral as a Sea Surface Temperature Proxy: Records from Jukung Coral S. Y. Cahyarini; J. Zinke
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2010.42.1.5

Abstract

Sr/Ca  has been analyzed from coral core from the Seribu Islands  reef complex  i.e  Jukung  Island.  SST  from  ERSST  dataset  and  air  temperature measured at Jakarta is used for Sr/Ca calibration. The results show that Jukung Island  coral  Sr/Ca  correlates  better  with  SST  than  with  air  temperature.  A comparison  between  the  Sr/Ca  records  with  the  Nino  3.4  index  shows  that Jukung  coral  sites  indicate  warming  sea  surface  temperatures  during  the beginning  of El Nino  events followed by cooling temperatures at the end of El Nino years.
Tolerance Stack Analysis in Francis Turbine Design Indra Djodikusumo; Koko Suherman; Paskalis Bowo A. Oken
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2010.42.1.6

Abstract

The  tolerance  stacking  problem  arises  in  the  context  of  assemblies from  interchangeable  parts  because  of  the  inability  to  produce  or  to  join  parts exactly  according  to  nominal  dimensions.  Either  the  relevant  part's  dimension varies around some nominal values  from part to part or the act of assembly that leads  to  variation.  For  example,  as  runner  of  Francis  turbine  is  joined  with turbine shaft via mechanical lock,  there is not only variation in the diameter of runner  and the concentricity between the runner  hole  and  turbine  shaft, but also the  variation in  concentricity  between  the  outer  parts  of  runner  to runner hole. Thus,  there  is  the  possibility  that  the  assembly  of  such  interacting  parts  won't function  or  won't  come  together  as  planned.   Research  in  this  area  has  been conducted and 2 mini hydro Francis turbines (800 kW and 910 kW) have been designed and manufactured for San Sarino and Sawi Dago 2 in Central Sulawesi. Experiences  in  analyzing  the  tolerance  stacks  have  been  documented.  In  this paper it will be demonstrated how the requirements of assembling performance are derived to be the  designed    tolerances  of each interacting component, such  a way that the assembling would be functioning and come together as planned.

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