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Jurnal Optimasi Sistem Industri

JOSI
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Published by Universitas Andalas

ISSN : 20884842 EISSN : 24428795 DOI : -

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

Jurnal Optimasi Sistem Industri (JOSI) is a peer-reviewed journal that is published periodically (April and October) by the Department of Industrial Engineering, Faculty of Engineering, Universitas Andalas, Padang.

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Articles 9 Documents

Search results for , issue "Vol. 18 No. 1 (2019): Published April 2019" : 9 Documents clear

Model Optimasi Perancangan Jaringan Rantai Pasok Biomassa dari Tandan Kosong Kelapa Sawit di Sumatera Barat Imansuri, Febriza; Hadiguna, Rika Ampuh; Afrinaldi, Feri
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
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.v18.n1.p1-13.2019

West Sumatra has great potential in developing biomass based on palm oil waste. This is because the largest plantation production in West Sumatra comes from the oil palm commodity of 1,082,820 tons in 2014. Therefore, it is necessary to design a model of supply chain biomass network for the distribution of Empty Fruit Bunches (EFB) from CPO factory suppliers located in West Sumatra and distributed to Depot Pertamina Teluk Kabung. Stages performed in the implementation of this study began with a preliminary study to determine the potential of biomass in West Sumatra. Furthermore, the design of chain supply chain optimization model by identifying supply chain activity, knowing the characteristics of supply chain system and make the formulation of mathematical model. The design of supply chain biomass from Empty Fruit Bunches (EFB) in West Sumatera, starting from raw material Tandan Kosong Kelapa Sawit (TKKS) sourced from Crude Palm Oil (CPO) factory in West Pasaman Regency and surrounding. This is because Pasaman Barat Regency is the central agroindustry of oil palm plantation which has 17 most palm oil factories in West Sumatra. The potential of bioethanol derived from CPO waste can be done by establishing bioethanol plant located with the same CPO factory so that it is adjacent to the source of the raw material. The result of the mathematical model mixed integer linear programming is placement of bioethanol plant location at PT Pasaman Marama Sejahtera with medium scale and total cost of IDR 251,563,700,000.00.

Aplikasi Terapi Wicara bagi Remaja Penyandang Disabilitas Intelektual Ringan Thedy Yogasara; Cecilia Stefiany
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

There are more than three million people in Indonesia who have speech disorders. Speech disorders are also experienced by people with intellectual disabilities, who need speech therapy to practice their expressive speech skills. However, the current types of speech therapy, in general, are not easily accessible and require considerable cost. The purpose of this study, therefore, is to provide a speech therapy tool that can be accessed easily and requires low cost. This research designs a mobile application as a speech therapy tool for teenagers with mild intellectual disability. The design process began with the identification of user needs, followed by the design of application concepts using a design workshop. The best concept was developed into a prototype, which was then evaluated through a usability testing, using effectiveness, efficiency, learnability, memorability, and accessibility as the evaluation criteria. Based on the evaluation, the effectiveness of the application is 82.2% and its efficiency is 78.9%. Meanwhile, the learnability and memorability of the application consecutively score 80% and 94.4%. These results show that the application has a good level of accessibility. Evaluation was also conducted using the System Usability Scale (SUS) questionnaire, which resulted in a total score of 74 (acceptable). In addition, interviews were conducted to identify remaining flaws that were subsequently used as a basis for design improvement of the application.

Model Kebijakan Perkebunan Nilam di Pasaman Barat dengan Pendekatan Sistem Dinamis Dina Rahmayanti; Rika Ampuh Hadiguna Hadiguna; Santosa Santosa; Novizar Nazir
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

This study aims to design a model by providing several policy alternatives that are useful to assist the government in determining appropriate policies in increasing patchouli oil production from the supply aspect. The supply to be studied is patchouli plantations. The plantation is one of the important aspects affecting patchouli oil production. The choice of alternatives is based on testing alternative policies on a computerized model. Patchouli plantation models are made in line with real systems using system dynamics. From the results of the study, there are several policy alternatives that can be taken by the government, policies related to land expansion and conversion, policies related to increasing agricultural production, policies related to human resource improvement, policies related to agricultural equipment assistance and policies related to the use of superior seeds in plantations.

Usulan Penerapan Total Productive Maintenance pada Mesin Turbin Gas Irnanda Pratiwi
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Overall Equipment Effectiveness (OEE) is one of the tools to enhance the effectiveness of the utilization rate of machinery and equipment in Total Productive Maintenance (TPM). TPM is a principle of management to improve productivity and efficiency of the production company to use the machine effectively. This study measures the value of OEE on gas turbine engine Centaur 50 C3344 which held on operation and maintenance section in PT Perta Samtan Gas Kilang Ekstraksi NGL Prabumulih in the period, followed by analyzing the value of using Pareto analysis of the results obtained by the root causes of the OEE. The conclusion that the value of the analysis results obtained on average exceeded the standard value of OEE 85.63% from 85%, even though in one period the value of OEE less than standard (22.63%). Factors that may experience rapid drop predicted loss is breakdown losses 382 hours (46.53%) and idling minor stoppages 373 hours (45.43), reduce speed 48 hours or 5.85%, rework losses 13 hours or 1.58%, and set up and adjustment losses 5 hours or 0.61%. As a result of which may not have an impact in a short time, but will immediately attack the machine if there is no treatment of maintenance as continuously and directly.

Model Hubungan Antar Pemangku Kepentingan dalam Koordinasi Penanganan Bencana di Kota Padang Dicky Fatrias; Ringga Sri Rahayu Agustia
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Padang, capital of West Sumatera, is one of a disaster-prone area in Indonesia which was impacted the most by 2009 earthquake disaster. After seven years passed, The Regional disaster management agency of West Sumatra stated that the coordination between relevant government agencies in disaster management was still lacking. Associated with such issue, this research proposes to model an appropriate stakeholder’s coordination scheme based on the concept of 3PR (public, private, and people relationship). After all candidates of stakeholder are considered, a successful indicators of disaster response are identified. Using fuzzy AHP, the indicators were weighted based on their relative importance, and the traffic light system was applied to screen the weighted indicators. Finally, the role of each stakeholder was then identified and charted using the interpretive structural model (ISM). The proposed relationship model in disaster management coordination in Padang City consists of two levels. The first level consists of five stakeholders, namely Semen Padang, Insurance, Muhammadiyah, LPP TVRI, and Andalas University. The second level consists of three stakeholders, namely BPBD Kota Padang, Padang City Social Service and Padang City Health Office. Based on the above mapping, public sectors hold the biggest responsibility in the coordination of disaster management while the private sector and people as a supporter in the success of disaster management activities in the city of Padang

Model Matematika Dampak Industri 4.0 terhadap Ketenagakerjaan Menggunakan Pendekatan Sistem Rio Aurachman
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
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.v18.n1.p14-24.2019

The objective of this research was to provide a mathematical model that can explain the relationship between the unemployment rate, openness to technology, and people development initiatives to overcome technology development. These research discussions were carried out in the context of predicted technological developments related to Industry 4.0 which caused the loss of several jobs and formed new business models that will provide new jobs. The method used is to using system approach so that mathematical modeling can be obtained from Influence Diagrams which have been designed in previous research. Mathematical models illustrate that openness to technology is directly proportional to the number of unemployed. And the unemployment rate is inversely proportional to the level of human resource development. Development of human resources that are too large without being carried out with openness and technological progress, can also cause unemployment. This mathematical model can be used as a decision maker to understand and establish appropriate policies in the face of this Industry 4.0 change.

Model Pengoptimuman Portofolio Mean-Variance dan Perkembangan Praktisnya Ezra Putranda Setiawan; Dedi Rosadi
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
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.v18.n1.p8-16.2019

Many research about portfolio optimization in Indonesia still uses the ‘original’ mean-variance model as proposed by Markowitz more than 60 years ago. This article reviews the development and modification of the Markowitz’s mean-variance model, especially that dealing with real stock-market features, which could help the investor to create their own portfolio. There were several real-stock market features that implemented in the modification of mean-variance portfolios optimization models, such as the minimum transaction lots, the transaction cost, the cardinality constraint, the weight constraint, and the sectoral constraint. To implement these features, several heuristic methods were used to obtain the optimal portfolio weight, such as genetic algorithm, Tabu search, bee colony algorithm, particle swarm algorithm, and simulated annealing. These methods become alternative to the mathematical programming method.

Basic Emotion Recogniton using Automatic Facial Expression Analysis Software Vivi Triyanti; Yassierli Yassierli
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
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.v18.n1.p55-64.2019

Facial expression was proven to show a person's emotions, including 6 basic human emotions, namely happy, sad, surprise, disgusted, angry, and fear. Currently, the recognition of basic emotions is applied using the automatic facial expression analysis software. In fact, not all emotions are performed with the same expressions. This study aims to analyze whether the six basic human emotions can be recognized by software. Ten subjects were asked to spontaneously show the expressions of the six basic emotions sequentially. Subjects are not given instructions on how the standard expressions of each of the basic emotions are. The results show that only happy expressions can be consistently identified clearly by the software, while sad expressions are almost unrecognizable. On the other hand surprise expressions tend to be recognized as mixed emotions of surprise and happy. There are two emotions that are difficult to express by the subject, namely fear and anger. The subject interpretation of these two emotions varies widely and tends to be unrecognizable by software. The conclusion of this study is the way a person shows his emotions varies. Although there are some similarities in expression, it cannot be proven that all expressions of basic human emotions can be generalized. Further implication of this research needs further discussion.

Sistem Pengukuran Kinerja Supply Chain Management Pada Proyek Konstruksi Demi Ramadian; Elita Amrina
Jurnal Optimasi Sistem Industri Vol. 18 No. 1 (2019): Published April 2019
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.v18.n1.p75-85.2019

Construction project implementation process is often found inefficiency and problems at every stage of the construction process. Inefficiencies are caused because construction projects have high levels of fragmentation. The high level of fragmentation cannot be separated from the complexity and many work items on construction projects. To reduce the problem of inefficiencies in the implementation of construction projects required good supply chain management or better known as supply chain management (SCM) on construction projects. Therefore it is necessary to study the management of SCM in the construction project to reduce the inefficiency that occurred. SCM management of construction projects is done by designing SCM performance measurement systems in construction projects. This performance measurement system produces indicators that are combined with the Supply Chain Operation Reference (SCOR) method. So it helps in performing SCM performance measurement on construction projects. From the design results, obtained 14 SCM performance indicators on construction projects. The performance indicators are then used to perform SCM performance measurement of cement plant construction projects. From the measurement results obtained SCM performance value of 41 from a scale of 100. This shows the performance of SCM on construction projects for the construction of the cement plant is at a marginal level.

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Contact Name
Rika Ampuh Hadiguna

Contact Email
hadiguna@ft.unand.ac.id

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Journal Mail Official
hadiguna@ft.unand.ac.id

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Location
Kota padang,

Sumatera barat

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Rika Ampuh Hadiguna

Contact Email hadiguna@ft.unand.ac.id

Phone -

Journal Mail Official hadiguna@ft.unand.ac.id

Editorial Address -

Location Kota padang, Sumatera barat INDONESIA

Abstract

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Contact Name
Rika Ampuh Hadiguna

Contact Email
hadiguna@ft.unand.ac.id

Phone
-

Journal Mail Official
hadiguna@ft.unand.ac.id

Editorial Address
-

Location
Kota padang,

Sumatera barat

INDONESIA