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All Journal Jurnal Teknik Mesin Mechanova Jurnal Titra Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri International Journal of Supply Chain Management International Journal of Industrial Research and Applied Engineering Jurnal Inovasi Teknologi dan Edukasi Teknik
Gan, Shu-San
Petra Christian University
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Studi Karakteristik Volume Tabung Udara dan Beban Katup Limbah Terhadap Efisiensi Pompa Hydraulic Ram Gan Shu San; Gunawan Santoso
Jurnal Teknik Mesin (Sinta 3) Vol. 4 No. 2 (2002): OCTOBER 2002
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

A community that live far away from electricity power source has a problem in moving water from low to a higher location. One option for solving this problem is using hydraulic ram whose energy is the pressure that resulted from water hammer of water that flows into the pump through pipes. In this paper, a study on the effects of air-tube volume and disposal valve weight to the pump efficiency will be conducted and further the optimal setting for those factors that will gain the best efficiency will be determined.. After the experiments and analysis of variance and also response surface regression, resulting that both factors, air-tube volume and disposal valve weight, influence the efficiency as well as interaction between them. The optimal setting for best efficiecy is at 1300 ml tube volume and 400 gram weight to get efficiency of 42.9209%. Abstract in Bahasa Indonesia : Pada masyarakat yang bertempat tinggal jauh dari jangkauan sumber energi listrik terdapat kendala untuk memindahkan air dari tempat rendah ke tempat yang lebih tinggi. Salah satu cara yang dapat digunakan adalah dengan pompa hydraulic ram yang energi atau tenaga penggeraknya berasal dari tekanan atau hantaman air yang masuk ke dalam pompa melalui pipa. Pada makalah ini ingin diketahui pengaruh faktor volume tabung udara dan beban katup limbah pompa hydram terhadap efisiensi serta menentukan pengaturan yang paling optimal untuk mendapatkan efisiensi terbaik. Dari hasil percobaan dan analisa varians serta regresi response surface diperoleh hasil bahwa faktor volume tabung udara dan beban katup limbah berpengaruh pada efisiensi pompa, begitu pula interaksi antara kedua faktor. Pengaturan optimal untuk mendapatkan efisiensi terbaik adalah saat volume tabung 1300 ml dan beban 400 gram untuk mendapatkan efisiensi 42,9209%. Kata kunci: Pompa hydraulic ram, efisiensi, metode response surface.
Desain Eksperimen untuk Mengoptimalkan Proses Pengecoran Saluran Keluar Teko Mashuri Santoso; Gan Shu San; Soejono Tjitro
Jurnal Teknik Mesin (Sinta 3) Vol. 5 No. 1 (2003): APRIL 2003
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

The most frequently found defect in the casting process of making teapots out flue is that the outlet is too narrow or even blocked at the end of the casting process. There are many factors influence that defect. This defect condition can be represented as the thickness of the casting product. In this paper, the significant factors that influence the thickness of the out flue resulted from the casting process will be analyzed and further got their optimum conditions. Design experiments methods will be implemented here, especially the factorial design method to determine the significant factors along with their optimum conditions. Also, the response surface method will be applied to obtain the approximation model for the thickness of the out flue as a function of the factors found earlier so that the most optimal result can be obtained under a design optimization method. It is concluded from the experiments results and analysis that the significant factors for the thickness of out flue are pouring temperature, sprue radius and holding time. The optimum conditions of those factors are 475°C, 29.6 mm and 8 seconds respectively with 2.54 mm thickness. Abstract in Bahasa Indonesia : Kondisi cacat yang paling banyak dijumpai pada proses pengecoran saluran keluar teko adalah lubang saluran keluar pada ujung teko yang terlalu sempit bahkan tertutup di akhir proses pengecoran. Banyak faktor yang mempengaruhi proses pengecoran ini sehingga menyebabkan cacat tersebut. Kondisi cacat ini dapat direpresentasikan dengan ketebalan dari produk cor saluran keluar teko. Pada makalah ini akan dianalisa faktor yang paling signifikan mempengaruhi ketebalan saluran teko hasil cor. Metode yang digunakan adalah metode desain eksperimen khususnya metode desain faktorial untuk menentukan faktor-faktor yang signifikan serta kondisi optimumnya dan metode response surface untuk mendapatkan model pendekatan untuk ketebalan saluran teko sebagai fungsi dari faktor-faktor tersebut sehingga dapat diperoleh kondisi keseluruhan yang paling optimal. Dari analisa hasil eksperimen ini ditemukan bahwa faktor yang signifikan terhadap ketebalan adalah temperature tuang, radius sprue dan holding time. Dapat pula disimpulkan bahwa kondisi optimum dari factor-faktor tersebut adalah temperatur tuang 475°C, radius sprue 29.6 mm dan holding time 8 detik yang menghasilkan ketebalan sebesar 2.54 mm. Kata kunci : pengecoran, desain eksperimen, desain faktorial, response surface, optimasi.
Remanufacturing: Strategi dan Desain dalam Rantai Pasok Lingkaran Tertutup Gan Shu San; Didik Wahjudi; Yopi Yusuf Tanoto
Jurnal Teknik Mesin (Sinta 3) Vol. 18 No. 2 (2021): OCTOBER 2021
Publisher : Institute of Research and Community Outreach, Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/jtm.18.2.51-59

Abstract

Remanufaktur adalah proses pemulihan barang bekas yang memberikan preservasi tertinggi terhadap nilai tambah produk originalnya, proses ini mentransformasikan barang bekas menjadi “seperti baru” dan seringkali dikembalikan ke pasar dengan garansi yang ekuivalen seperti produk baru. Praktik remanufaktur ini dapat memberikan dampak positif terhadap lingkungan karena dapat mengurangi limbah yang dibuang ke tempat pembuangan akhir. Namun remanufaktur juga memiliki banyak tantangan, tidak hanya dalam aspek teknikal dan operasional, tetapi juga pada aspek strategi dan desain. Makalah ini menyajikan pendekatan konseptual berdasarkan tinjauan literatur untuk menjawab tantangan remanufaktur dalam rantai pasok lingkaran tertutup, serta mengusulkan strategi dan desain implementasinya. Pendekatan yang digunakan adalah qualitative content analysis untuk mengidentifikasi berbagai konsep dan membagi dalam kategori yang sesuai. Hasil analisis menunjukkan bahwa implementasi remanufaktur dalam rantai pasok lingkaran tertutup dapat diterapkan dengan penentuan motif dan pendorong, dimensi keputusan remanufaktur, strategi implementasi remanufaktur, desain produk dan proses, serta desain jaringan.
OPTIMASI KUALITAS WARNA MINYAK GORENG DENGAN METODE RESPONSE SURFACE Didik Wahjudi; Lely Tjandranitia Dewi; Gan Shu San
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 1 No. 1 (1999): JUNE 1999
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (59.695 KB) | DOI: 10.9744/jti.1.1.18-29

Abstract

Quality optimization of cooking oil color is done by performing experiment using samples of 98 gram cooking oil and 2 gram of whitening agent, i.e. bleaching earth and carbon active. There are three variables that affects the cooking oil color, i.e. temperature (X1) in the range of 90 to 110° C, stirring time of 10 to 20 minutes, and active carbon concentration (X3) of 5 to 15% (of the 2 gram of whitening agent). Response Surface Method consists of two-experiment designs, the first order and the second order experiment designs. The first order experiment design is the factor screening stage, while the second order design is the optimization stage. The first order experiment shew that only stirring time and the concentration of active carbon affects the color. The second order experiment resulted in that the appropriate optimization model is Y = 1,7833 + 0,0538 X2 0,1098 X3 + 0,0477 X2 X3 + e, and that there are three choices of optimal factor condition with regards of the whitening agent cost. Abstract in Bahasa Indonesia : Optimasi kualitas wama minyak goreng dilakukan dengan mengadakan eksperimen menggunakan sampel minyak goreng dengan berat 98 gram dan zat pemutih 2 gram, yang terdiri dari bleaching earth dan carbon active. Variabel-variabel yang mempengaruhi warna minyak goreng ada tiga, yaitu temperatur (XI) antara 90°C sampai 110°C, waktu pengadukan (X2) antara 10 menit sampai 20 menit, dan kadar CA (X3) antara 5% sampai 15% (dari 2 gram zat pemutih). Metode Response Surface terdiri dari dua rancangan eksperimen, yaitu rancangan eksperimen orde I dan rancangan eksperimen orde II. Dimana rancangan eksperimen orde I merupakan tahap penyaringan faktor (screening test), sedangkan rancangan eksperimen orde II merupakan tahap optimasi. Dari hasil eksperimen orde I, diperoleh basil bahwa variabel yang berpengaruh adalah waktu pengadukan dan CA. Hasil eksperimen orde II menyatakan bahwa model optimasi yang sesuai adalah Y = 1,7833 + 0,0538 X2 0,1098 X3 + 0,0477 X2 X3 + e, dan kondisi optimum faktor dengan pertimbangan biaya zat pemutih ada tiga pilihan. Kata kunci: desain eksperimen, rekayasa mutu
Closed-loop Supply Chain as an Agent of Sustainable Development Shu-San Gan
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 17 No. 1 (2015): JUNE 2015
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.503 KB) | DOI: 10.9744/jti.17.1.7-16

Abstract

Sustainability has recently become an important issue which received growing attentions from government, society, industries as well as academia. There have been concerns on relatively rapid growth in population and increased quality of life despite limited natural resources and landfill capacity. Closed-loop Supply Chain (CLSC) is one of many approaches to mitigate the abovementioned disproportion. This article aims to study closed-loop supply chain by explaining the definition, description, pros and contras, relevance, case studies from literature, and potential research; such that its role as an agent of sustainable development can be recognized.
Pricing and Warranty Level Decisions for New and Remanufactured Short Life-Cycle Products Gan Shu San; I Nyoman Pujawan
Jurnal Teknik Industri Vol. 19 No. 1 (2017): JUNE 2017
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (550.579 KB) | DOI: 10.9744/jti.19.1.39-46

Abstract

Remanufacturing has become more prominent as a recovery process to mitigate the massive disposal of short life-cycle product at its end-of-use. However, remanufactured product is often perceived to be inferior to new product, and it has lower value in consumer’s willingness to pay. To increase the perceived quality of the remanufactured product, manufacturer offers a warranty, since one of the three roles possessed in warranty is being a signal to product reliability. This paper studies the pricing decisions and warranty level decision for new and remanufactured products in a closed-loop supply chain consists of a manufacturer and a retailer. The optimization modeling is performed under Stackelberg game with manufacturer as the leader. We found that higher expansion effectiveness coefficient would increase the supply chain profit. Also, there is an interval of demand’s speed of change, where the total profit would be at its highest. The optimum warranty level can be achieved regardless the initial warranty level set at the beginning of retailer’s optimization. Furthermore, the remanufactured product’s wholesale and retail prices are influenced by the expansion effectiveness coefficient.
Analyzing Remanufacturability of Mobile Phones using DEMATEL Approach Gan Shu San
Jurnal Teknik Industri Vol. 21 No. 1 (2019): June 2019
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (699.909 KB) | DOI: 10.9744/jti.21.1.33-42

Abstract

The use of mobile phone has increased at a surprisingly high rate over these two decades.  For many people, especially young generations, mobile phone has even become a primary need. As a consequence, the production of mobile phone has increased significantly and followed immediately by the disposal, as a result of its short life-cycle nature. Recently, there are substantial initiatives proposed in order to mitigate the effect of e-waste to the environment. Remanufacturing is one of recovery processes that could extend product’s useful life, and provide a circular life-cycle instead of linear. However, there are many factors that can affect the success of remanufacturing engagement, and specifically remanufacturability of a mobile phone. There are numerous considerations of remanufacturability with regards to the short life-cycle nature of mobile phone, and these factors can be qualitative or quantitative, with conflicting potentials, and some of them may be uncertain. In this study, we use Decision Making Trial and Evaluation Laboratory (DEMATEL) approach to identify the interrelationship among the factors, and analyze those results to identify the prominent factors. Furthermore, an influential-relation map is provided to support visualization for managerial implications.
Knowledge Sharing in Closed-Loop Supply Chain Management Shu-San Gan
International Journal of Industrial Research and Applied Engineering Vol 2, No 1 (2017)
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (284.809 KB) | DOI: 10.9744/JIRAE.2.1.1-7

Abstract

In the recent decades, closed-loop supply chain has been studied extensively due to the increased concern on sustainable development. It integrates forward and reverse flows where the collaborative supply chain takes place. Knowledge management is one important part of an organization that can improve the effectiveness of the processes within the organization. Knowledge sharing is significant in a collaborative supply chain since it affects the organizational performance and competitive advantage. The complexity in closed-loop supply chain can be managed better by encouraging knowledge sharing among the supply chain members. This paper presents a conceptual framework to implement knowledge sharing in a closed-loop supply chain management, for improving the CLSC members’ performance. The success factors have been identified, and a framework has been presented, it consists of knowledge flows, management aspect and socio-technical aspect.
Penerapan Analytical Hierarchy Process dalam Sistem Penunjang Keputusan untuk Pemilihan Telepon Cerdas Della Suci Anggraini; Siana Halim; Gan Shu San
Jurnal Titra Vol 9, No 1 (2021): Jurnal Titra 9(1) Januari 2021
Publisher : Jurnal Titra

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Abstract

The rapid development in technological advances has increased the competition among companies in the information and communication sector in making superior products that demanded by customers, one of which is smartphone. This research was conducted to identify trends in customer’s interest in selecting second-hand smartphones, low-end smartphones, and refurbished smartphones. Data is collected using online questionnaire (google form) with the target of student respondents and offline questionnaire with the target of worker respondents (security, cleaning service, industrial employees, etc.). The Analytical Hierarchy Process methodis used to determine the preferences of smartphones alternatives desired by respondents. Low-end smartphones are the main choice of student and worker respondents.
Smartphone Donation for Education: A Technopreneurship’s Approach in Indonesian Case Study Halim , Siana; A.Y. Aysia, Debora; Lestari, Jessi; Shu San, Gan
Jurnal Inovasi Teknologi dan Edukasi Teknik Vol. 3 No. 6 (2023)
Publisher : Universitas Ngeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um068v3i62023p229-235

Abstract

This paper proposed a smartphone donation to help Indonesian students in remote areas and students who needed help, such as students in orphanages in Indonesia, using the technopreneurship approach. The technopreneurship steps that we used in this study started with collecting data through a questionnaire to know the willingness of Indonesians to donate and their preferences in donating their used smartphones. We found that 78.7% of the respondents are eager to donate, and they trust the social, educational, and religious institutions as trusted, credible institutions as places for collecting used smartphones. However, online channels are more convenient for them to donate, followed by donations through religious institutions such as mosques, churches, viharas, and temples. As a result, a business model canvas and a business process are constructed to answer the eagerness of Indonesians to donate their used smartphones. Penelitian ini mengusulkan donasi smartphone untuk membantu pelajar Indonesia di daerah terpencil dan pelajar yang membutuhkan bantuan, seperti pelajar di panti asuhan di Indonesia, dengan menggunakan pendekatan technopreneurship. Langkah-langkah technopreneurship yang kami gunakan dalam penelitian ini dimulai dengan mengumpulkan data melalui kuesioner untuk mengetahui kesediaan masyarakat Indonesia untuk berdonasi dan preferensi mereka dalam mendonasikan smartphone bekas mereka. Kami menemukan bahwa 78,7% dari responden sangat ingin berdonasi, dan mereka mempercayai lembaga-lembaga sosial, pendidikan, dan keagamaan sebagai lembaga yang terpercaya dan kredibel sebagai tempat pengumpulan smartphone bekas. Namun, saluran online lebih nyaman bagi mereka untuk berdonasi, diikuti oleh donasi melalui lembaga keagamaan seperti masjid, gereja, vihara, dan kuil. Hasilnya, sebuah kanvas model bisnis dan proses bisnis dibangun untuk menjawab keinginan masyarakat Indonesia untuk mendonasikan smartphone bekas mereka.
Co-Authors A.Y. Aysia, Debora Della Suci Anggraini Didik Wahjudi Didik Wahjudi Gideon Indra purwanto Gunawan Santoso Halim , Siana Hansel Buddie Soepriyanto I Nyoman Pujawan Juliana Anggono Lely Tjandranitia Dewi Lely Tjandranitia Dewi Lestari, Jessi Luke Sugiharto Susilo Mashuri Santoso Mirah S. Masbudi Randy Randy Siana Halim Soejono Tjitro Sugiarto Sugiarto Susanto Widjojo Tanoto, Yopi Yusuf Yohan Pramono