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All Journal Jurnal Rekayasa Sistem Industri Journal of the Indonesian Mathematical Society Jurnal Optimasi Sistem Industri

Sugih Sudharma Tjandra, Sugih Sudharma

Universitas Katolik Parahyangan

Author-ID : 2376705

Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mathematics Mechanical Engineering

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Articles

SIMULATION OF ANALYTICAL TRANSIENT WAVE DUE TO DOWNWARD BOTTOM THRUST Tjandra, Sugih Sudharma; Pudjaprasetya, Sri Redjeki; Wiryanto, Leo Hari
Journal of the Indonesian Mathematical Society Volume 21 Number 2 (October 2015)
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.21.2.189.93-104

Generation process is an important part of understanding waves, especially tsunami. Large earthquake under the sea is one major cause of tsunamis. The sea surface deforms as a response from the sea bottom motion caused by the earthquake. Analytical description of surface wave generated by bottom motion can be obtained from the linearized dispersive model. For a bottom motion in the form of a downward motion, the result is expressed in terms of improper integral. Here, we focus on analyzing the convergence of this integral, and then the improper integral is approximated into a finite integral so that the integral can be evaluated numerically. Further, we simulate free surface elevation for three different type of bottom motions, classified as impulsive, intermediate, and slowÂ movements. We demonstrate that the wave propagating to the right, with a depression as the leading wave, followed with subsequent wave crests. This phenomena is often observed in most tsunami events.DOI :Â http://dx.doi.org/10.22342/jims.21.2.189.93-104

Penerapan Metoda Six Sigma DMAIC untuk Mengurangi Cacat Pakaian 514 (Studi Kasus di CV Jaya Reksa Manggala) Fransiscus, Hanky; Tjandra, Sugih Sudharma; Utama, Nixon Setia
Jurnal Rekayasa Sistem Industri Vol 7, No 1 (2018): Jurnal Rekayasa Sistem Industri
Publisher : Universitas Katolik Parahyangan

CV Jaya Reksa Manggala (JRM) is one of clothing company. With increasing competition in this clothing company, the companies are required to keep improving the quality of clothing products. One of the important things in quality is reduction of product defects. One of the proven methods ofÂ quality improvement is the Six Sigma DMAIC method, which is a continous improvement method that aims to achieve the best quality. One of the products of CV JRM which is still have a lot of defects is 514 products. From the initial data obtained, DPMO value for process I and II for 514 products is 10,768.52 and 27,341.42 with sigma level 3.79 and 3.43. The steps undertaken in this Six Sigma DMAIC method include define, measure, analyze, implementation and control. Several proposed improvements were then made to reduce the problem of these defects and from the data at the control stage, the DPMO values of processes I and II became 2,941.76 and 1,812.69 with sigma levels of 4.25 and 4.41. From this result it can be said that with Six Sigma DMAIC method, there is improvement of quality for product 514 at CV JRM.Â

Penerapan Metoda Six Sigma DMAIC untuk Mengurangi Cacat Pakaian 514 (Studi Kasus di CV Jaya Reksa Manggala) Sugih Sudharma Tjandra; Nixon Setia Utama; Hanky Fransiscus
Jurnal Rekayasa Sistem Industri Vol. 7 No. 1 (2018): Jurnal Rekayasa Sistem Industri
Publisher : Universitas Katolik Parahyangan

CV Jaya Reksa Manggala (JRM) is one of clothing company. With increasing competition in this clothing company, the companies are required to keep improving the quality of clothing products. One of the important things in quality is reduction of product defects. One of the proven methods of quality improvement is the Six Sigma DMAIC method, which is a continous improvement method that aims to achieve the best quality. One of the products of CV JRM which is still have a lot of defects is 514 products. From the initial data obtained, DPMO value for process I and II for 514 products is 10,768.52 and 27,341.42 with sigma level 3.79 and 3.43. The steps undertaken in this Six Sigma DMAIC method include define, measure, analyze, implementation and control. Several proposed improvements were then made to reduce the problem of these defects and from the data at the control stage, the DPMO values of processes I and II became 2,941.76 and 1,812.69 with sigma levels of 4.25 and 4.41. From this result it can be said that with Six Sigma DMAIC method, there is improvement of quality for product 514 at CV JRM.

Perancangan Alat Bantu Pemegang Glidecam Untuk Meminimasi Beban Pada Lengan Pengguna Sugih Sudharma Tjandra; Hanky Fransiscus; Farrelius Anthony Junior
Jurnal Rekayasa Sistem Industri Vol. 9 No. 1 (2020): Jurnal Rekayasa Sistem Industri
Publisher : Universitas Katolik Parahyangan

One of the tools used by cameramen to help stabilize while recording is Glidecam. Glidecam works based on the use of additional weights to compensate the load from the camera. However, there are still weaknesses in the use of Glidecam, including the fatigue and aches felt by the cameraman after Glidecam's use. In addition, it may cause disruption to joint, ligament, muscle, nerve and tendon function, and spine, for continuous Glidecam use. One alternative tool to overcome this problem is the use of Arm Brace. Arm Brace in the form of a passive exoskeleton that will compensate for part of the load from Glidecam. The product design process includes creating mission statements, identifying customer needs, determining product specifications, developing concepts, selecting concepts, making prototypes and evaluating prototypes. In this study two prototypes were made and evaluation with statistical tests showed that there was a significant increase in the endurance time of using Glidecam on the use of the two prototypes compared to that without the tools. The selection of the final prototype is done with a qualitative evaluation from the user. Qualitative evaluation is carried out with six assessment criteria: ease of use and installation, product mobility, product mass, product robustness, product support and product mechanism.Keywords: Glidecam, Arm Brace, Eksoskeleton

SIMULATION OF ANALYTICAL TRANSIENT WAVE DUE TO DOWNWARD BOTTOM THRUST Sugih Sudharma Tjandra; Sri Redjeki Pudjaprasetya; Leo Hari Wiryanto
Journal of the Indonesian Mathematical Society Volume 21 Number 2 (October 2015)
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.21.2.189.93-104

Generation process is an important part of understanding waves, especially tsunami. Large earthquake under the sea is one major cause of tsunamis. The sea surface deforms as a response from the sea bottom motion caused by the earthquake. Analytical description of surface wave generated by bottom motion can be obtained from the linearized dispersive model. For a bottom motion in the form of a downward motion, the result is expressed in terms of improper integral. Here, we focus on analyzing the convergence of this integral, and then the improper integral is approximated into a finite integral so that the integral can be evaluated numerically. Further, we simulate free surface elevation for three different type of bottom motions, classified as impulsive, intermediate, and slow movements. We demonstrate that the wave propagating to the right, with a depression as the leading wave, followed with subsequent wave crests. This phenomena is often observed in most tsunami events.DOI : http://dx.doi.org/10.22342/jims.21.2.189.93-104

Perancangan Eksperimen Proses Ekstrusi Dengan Bahan Plastik Bekas Pakai Hanky Fransiscus, S.T., M.T.; Sugih Sudharma Tjandra; Monika Pangestu; Lusi Handranto
Jurnal Rekayasa Sistem Industri Vol. 11 No. 2 (2022): Jurnal Rekayasa Sistem Industri
Publisher : Universitas Katolik Parahyangan

Today, plastic waste is a serious problem and needs to be resolved immediately. Indonesia is the second largest contributor of plastic waste to the sea after China. This condition needs to be resolved immediately by looking for alternative solutions for plastic waste in all areas of life, including plastic waste in educational institutions. Observations at the Parahyangan Catholic University (Unpar) show that 41% of the total inorganic waste come from plastic packaging bottles. One alternative solution to the plastic waste problem is to recycle plastic waste and process it into other products that can be used. One alternative that is being explored for the process of recycling plastic waste in the Unpar environment is to use an extrusion machine in the Production Process Laboratory of the Faculty of Industrial Technology (FTI) Unpar. However, this machine has never been used for recycling plastic waste to be made into other products and the process parameters that can produce a good product are not yet known. Therefore, in this study, experimental design was carried out to determine process parameters to produce a good product with the existing extrusion machine. The plastic waste used in this test is plastic waste from Polypropylene (PP) plastic and Polyethylene Terephthalate (PET) plastic. The research consist of determining factors, factor levels, and randomization of treatment using completely randomized design method. The response of this experimental test is the result of product quality assessment involving 3 experts. The results show that the extrusion process on PET plastic waste materials with existing machines has not produced good recycled products. Other processes and machine improvements are still needed to produce a good product. As for PP plastic waste material, the recycling results obtained are quite good. The ANOVA test results show that the barrel temperature will affect the value of the quality of the product produced from PP plastic waste.

Application of Genetic Algorithms to Solve MTSP Problems with Priority (Case Study at the Jakarta Street Lighting Service) Sugih Sudharma Tjandra; Fran Setiawan; Hanoum Salsabila
Jurnal Optimasi Sistem Industri Vol. 21 No. 2 (2022): Published in November 2022
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/josi.v21.n2.p75-86.2022

Transportation is one thing that is very important and is the highest cost in the supply chain. One way to reduce these costs is to optimize vehicle routes. The Multiple Traveling Salesman Problem (MTSP) and Capacitated Vehicle Routing Problem (CVRP) are models that have been extensively researched to optimize vehicle routes. In its development based on actual events in the real world, some priorities must be visited first in optimizing vehicle routes. Several studies on MTSP and CVRP models have been conducted with exact solutions and algorithms. In a real case in the Jakarta City Street Lighting Section, the problem of determining the route in three shifts is a crucial problem that must be resolved to increase worker productivity to improve services. Services in MCB (Miniature Circuit Breaker) installation and maintenance activities for general street lights and priority is given to light points that require replacement. Because, in this case, the delivery capacity is not taken into account, the priority of the lights visited is random, and the number of street light points is enormous, in this study, we use the MTSP method with priority and solve by a genetic algorithm assisted by the nearest neighbor algorithm. From the resolution of this problem, it was found that the travel time reduction was 32 % for shift 1, 24 % for shift 2, and 23 % for shift 3. Of course, this time reduction will impact worker productivity so that MCB installation can be done faster for all lights and replace a dead lamp.

Co-Authors Farrelius Anthony Junior Hanky Fransiscus Hanky Fransiscus, S.T., M.T. Hanoum Salsabila Leo Hari Wiryanto Leo Hari Wiryanto, Leo Hari Lusi Handranto Monika Pangestu Nixon Setia Utama Setiawan, Fran Sri Redjeki Pudjaprasetya Sri Redjeki Pudjaprasetya, Sri Redjeki Utama, Nixon Setia

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