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All Journal Jurnal Manajemen dan Organisasi ASEAN Journal of Systems Engineering Majalah Forum Teknik UGM Jurnal Teknoin IPTEK Journal of Proceedings Series Dentika Dental Journal SPEKTRUM INDUSTRI Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Teknosains OPSI Journal of Engineering and Management in Industrial System Sinergi Media Mesin: Majalah Teknik Mesin Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Sistem dan Manajemen Industri Tekinfo | Scientific Journal of Industrial and Information Engineering Journal of Energy, Mechanical, Material and Manufacturing Engineering Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Indonesian Journal of Chemistry Conference SENATIK STT Adisutjipto Yogyakarta Jurnal Desain Idea: Jurnal Desain Produk Industri Institut Teknologi Sepuluh Nopember Surabaya RADIAL: JuRnal PerADaban SaIns RekAyasan dan TeknoLogi Jurnal Riset Teknologi Industri Dinamika Kerajinan dan Batik : MAJALAH ILMIAH IGKOJEI: Jurnal Pengabdian Masyarakat Jurnal Litbang Kota Pekalongan Destinesia : Jurnal Hospitaliti dan Pariwisata Makara Journal of Technology JURNAL TEKNIK INDUSTRI Innovative: Journal Of Social Science Research Applied Science and Technology Research Journal RADIAL: Jurnal Peradaban Sains, Rekayasa dan Teknologi Dinamika Kerajinan dan Batik: Majalah Ilmiah Proceedings International Conference on Economic Business and Social Science
Alva Edy Tontowi
Department Of Mechanical And Industrial Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Veterinary Other

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KAJIAN AWAL ANALISIS ATRIBUT YANG BERPOTENSI MEMPENGARUHI TINGKAT PENDANAAN PADA PROYEK 3D PRINTER DI PLATFORM CROWDFUNDING KICKSTARTER Nugraha Muharafandy; Alva Edy Tontowi
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2019): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 10 2019
Publisher : Prosiding SNST Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (177.035 KB)

Abstract

Salah satu alternatif mendapatkan modal bisa diperoleh dari penggalangan dana (crowdfunding). Dari keseluruhan proyek 3D Printer yang sukses pada platform Kickstarter, tidak semua proyek berada pada level pendanaan yang sama, oleh karena itu perlu untuk mengetahui hal-hal yang menyebabkan terjadinya perbedaan level pendanaan tersebut. Penentuan atribut yang berpotensi memiliki pengaruh terhadap level pendanaan dalam penelitian ini adalah dengan menggunakan pendekatan klasifikasi algoritma Random Forest dan AttributeWeight. Penelitian ini menghasilkan 3 atribut yang paling berpotensi terhadap level pendanaan, serta beberapa rule keputusan yang dapat menjadi acuan bagi creator untuk meningkatkan potensi dan peluang mendapatkan perolehan donasi pada platform crowdfunding.Kata kunci: 3D Printer, Crowdfunding, Data Mining, Funding level, Kickstarter, Random Forest.
EFEK APLIKASI SERICIN PADA HIDROKSIAPATIT TERHADAP PERLEKATAN SEL OSTEOBLAS Siti Sunarintyas; Yeni Yustisia; Alva Edy Tontowi
Jurnal Teknosains Vol 1, No 1 (2011): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.3989

Abstract

Hydroxyapatite (HA) is often used as a human bone graft. Modification of HA surface is developed to increase osseointegration process which is influenced by cells attachment surrounded the tissue. Sericin has polar side groups which accelerate cells attachment. The aim of this research was to determine the effect of sericin application over HA surface on the attachment of osteoblast cells. The research used HA synthesized from gypsum (Kulon Progo, Yogyakarta). Sericin was extracted from silkworm cocoons of Bombyx mori. Sericin of 0.01, 0.05, 0.1% were applied over HA discs surface (10 mm in diameter, 3 mm thick). The discs were inserted into osteoblast cells culture of MC3T3E1 for attachment test. The data were analyzed by ANOVA and LSD. The result showed that the amount of osteoblast cells attached to HA (7.60±0.42) was significantly difference (p<0.05) with HA + sericin 0.01% (10.30±0.52), HA + sericin 0.5% (10.63±0.70), HA + sericin 0.1% (10.67±0.87). Variation of sericin concentrations applied over HA did not influence any significant difference on the amount of cells attachment (p>0.05). In conclusion, sericin application over HA surface increased the amount of osteoblast cells attachment. Concentrations of sericin application over HA (0.01, 0.05, 0.1%) did not influence osteoblast cells attachment.
SCAFFOLD DARI BOVINE HYDROXYAPATITE DENGAN POLY VYNIALCHOHOL COATING Alva Edy Tontowi, Punto Dewo, Endang Tri Wahyuni, dan Joko Triyono
Jurnal Teknosains Vol 1, No 2 (2012): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.5978

Abstract

In Indonesia, it is about 40% patients with hard tissue defect due to ostheoporosis, cancer or accidents and therest are defect since they have born.For many years, efforts for recovering have been done by transplantation orimplantation methods.Transplantation is more appropriate butit is not sustain because of limited donor, whileimplantation using synthetic materials such as bioceramics scaffoldis expensive due to import and the scaffold iseasier to break which does not match to the medical requirements.The research therefore has been addressed to thisissue. Local bovine hydroxyapatite (bHA)scaffold has been used as thebase material and poly vynilalchohol (PVA)as a coating material.The bHA scaffold was prepared by cutting a fresh bovine bone in the size of 5mmx5mmx5mmand boil it in a distilled water to remove its organic material. It was then heated up at 900 oC for 2 hours infurnace to obtain bovine hydroxyapatite scaffold (bHA). Coating process has been carried out by dip coating of thebHAscaffold in PVA solution.
SCAFFOLD BHA/GELATIN DENGAN PELAPIS PVA UNTUK APLIKASI IMPLAN Alva Edy Tontowi, MK Herliansyah, dan Punto Dewo
Jurnal Teknosains Vol 3, No 1 (2013): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6123

Abstract

Hard tissue defect, particularly at the bone structure, is a common problem in Indonesia causing improper function. About 60% of it is caused by defects that occur since birth, and the rest is caused by other factors, such as accidents. To treat these problems, medical doctor usually carry out transplantation or implantation. Implantation is done by filling the bone cavity with biomaterial made from Ca/P-based material, such as hydroxyapatite (HA). In the form of powder, pure HA is difficult to be formed into a certain shape and geometry since this material is brittle and has a high melting point (1400 oc), which is impossible to reach in a surgery environment. Additionally, in the form of macro-porous blocks, they are very weak and easy to break, far from the requirements. In order to form pure HA at room temperature and still fulfill the required strength, other biocompatible materials are needed. In this work, HA, gelatin and PVA were used to form samples. The HA was derived from bovine bone, bioactivity and oteoconductivity. Gelatin was used as a matrix of the composite, whilst Polyvynil Alchohol (PVA) acted as a coating. The HA was derived by calcination of bovine chips at 900 oC for 2 hours, while the gelatin (G) and PVA were supplied by commercial purchase. The ratio of [G/bHA] to distilled water (H2O) was 30%, 40% dan 50% w/v. PVA 0.2% w/w coating was done by dipping the block in liquid nitrogen (N2). Tests were performed by DTS and microstructure analysis was carried out by SEM. The results show that sample with [G/bHA] of 50% w/v gave DTS of 6.219 MPa. This tensile strength matched the strength of human bone from a 62 year old person.  ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
MODEL INTEGRASI DESIGN DAN PROSES MANUFAKTUR PADA PERAKITAN PRODUK MULTI-PEMASOK Budi Susanto, MK Herliansyah, dan Alva Edy Tontowi
Jurnal Teknosains Vol 3, No 1 (2013): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6125

Abstract

In Product design process, aspects related to the manufacturing process and supply chain should be considered. The design is produced not only satisfy for consumers needs but it fulfilled the constraints related to manufacturingand supply chain aspects. This research aims to make a model to determine the cheapest product design from both of manufacturing process and supply chain. This research uses binary programming as an approach. The cost aspects used in this research are component’s manufacturing cost, supplier fixed contact cost, assembly operation cost and quality improvement cost. The result of research, a physical product design with the lowest total cost by combining components from several designs and adding the value constraint on the quality specification.
UJI BIOKOMPATIBILITAS KOMPOSIT POLIVINIL ALKOHOLHIDROKSIAPATIT DENGAN PENGUAT CATGUT SEBAGAI BAHAN PENYAMBUNG PATAH TULANG M. Taha Ma’ruf, Widowati Siswomihardjo, Marsetyawan HNE Alva Edy Tontowi
Jurnal Teknosains Vol 3, No 1 (2013): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6128

Abstract

Bone fracture fixation devices have been using rigid metallic materials such as titanium, titanium-alloy or cobalt chrome. Besides having some advantages, the titanium fixation devices also have disadvantages, such as too high strength and stiffness. This continuously stimulates the bone, causing bone atrophy under the plate, further disrupting the growth of bones, especially in children. Other deficiencies of this metal material is its sensitivity to temperature changes and the spread of metal ions in several organs. Some of these shortcomings led to the need for a secondary operation. Bone fracture fixation devices, such as the poly-l-lactic acid (PLLA), can be absorbed by the body and show some other advantages. However, it also has some drawbacks due to the high crystalline products during the degradation process. Lactic acid monomer released after degradation causes cellular response at the implant site, which facilitates the release of chemical mediators, such as prostaglandine by fibroblasts and macrophages as a cause of bone resorption. Therefore, this study aimed to develop the use of other polymeric materials that have good biocompatibility,appropriate mechanical strength, and can be absorbed by the body, such as Polyvinyl Alcohol (PVA). Previous research suggests that the PVA-HA composite with catgut reinforcement has sufficient and stable mechanical strength to be used as bone fracture fixation material. The purpose of this study is to know whether the PVA-HA composite with catgut reinforcement has good biocompatibility without toxicity and hypersensitivity effects in experimental animals. Biocompatibility testing includes local cytotoxicity and type IV contact hypersensitivity test. This type of research is experimental in vivo laboratory using wistar rats (Rattus norvegicus). Testing is done through two phases, in which induction or sensitization phase is done by rubbing PVA-HA composite with catgut reinforced ointment powder on the ears that lasts up to 10 days. After being rested for 3 days, this is followed by a second phase contact (elicitation) on day 14 and observed in the period of 24, 48, and 72 hours. Observations were made macroscopically and ear thickness was measured with a micrometer. Local toxicity testing is done by implantation of PVA-HA composite with catgut reinforcement on the back catgut of wistar rats. After a certain time period, the implant material is opened,examined, and observed histologically under a light microscope. The results showed no discoloration or induration on the animal ears in all treatment and control groups, both for the sensitization and the elicitation phase. One way ANOVA statistical test showed that there were no significant differences in the results of measurements of the thickness of the wistar rats ears from all treatment groups before and after treatment on measures 24, 48 and 72 hours (ρ >0.05). Microscopic examination showed no infiltration of acute inflammatory cells such as neutrophils, basophils or eusinofil, and chronic inflammatory cell infiltration such as macrophages, lymphocytes and plasma cells. It can be concluded that the PVA-HA composite with catgut reinforcement is a material that does not cause toxicity and hypersensitivity in experimental animals, thus potentially can be used as bone fractures fixation material. 
EVALUASI KOMPLIKASI PLATE EXPOSURE PASCA RESEKSI AMELOBL ASTOMA MANDIBULA DENGAN REKONSTRUKSI PELAT TITANIUM DI RSUP DR. SARDJITO YOGYAKARTA Maria Goreti Widiastuti; Marsetyawan HNE Soesatyo; Rahardyan Magetsari; Alva Edy Tontowi
Jurnal Teknosains Vol 5, No 2 (2016): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.24222

Abstract

Resection of the jaw is a primary option of treatment in mandibular ameloblastoma with bone damage. Mandibular resection will cause mandibular stability disturbance due toloss of some part of the bone. Instability of the mandible can cause aesthetic, physiological, and psychological malfunctioning. To restore its stability, installment of mandibular reconstruction plate on the remaining mandibular by using screws. However, it is not uncommon that plate exposure occurs following mandibular reconstruction, caused by inaccurate adaptation of the plates to the mandibular bone. A  3D stereolithography modelcan help provide the best assesment on the bone defect, plan the making of the more easily pre-operative curved plates and provide more accurate faster surgery time. Objective: To evaluate plate exposure after mandibular resection with titanium reconstruction plates in Dr. SardjitoHospital. Case report: A case was reported on mandibular reconstruction after resection of ameloblastoma with titanium plate performed in Dr. Sardjito Hospital that experienced intra-oral plate exposure and oro-cutaneous fistula on the left mandible. The clinical evaluation showed the curved titanium plate did not adapt well with the remaining mandibular bone; therefore, the titanium plate was removed without replacing it with a new plate. Inappropriate adaptationof curved titanium plate is one of the main causes of plate exposure. The use of a 3D stereolithography model is very helpful for the success of mandibular reconstruction.
PROSES SINTESIS DAN KARAKTERISASI FTIR HIDROKSIAPATIT DARI GIPSUM ALAM KULON PROGO Joko Sedyono; Alva Edy Tontowi
Media Mesin: Majalah Teknik Mesin Vol 9, No 1 (2008)
Publisher : Program Studi Teknik Mesin, Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v9i1.3125

Abstract

Improvement of Andong Horseshoe Quality in Yogyakarta City to Support City Tourism Alva Edy Tontowi; Mochammad Noer Ilman; Dawi Karomati Baroroh
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 7, No 1 (2021): March
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1477.586 KB) | DOI: 10.22146/jpkm.44045

Abstract

The Zero Kilometer Point is an important route for andong horses in Yogyakarta City. The renovation and replacement of road material with andesite can cause horses to slip because the horseshoes have not been adjusted to the new road material. If neglected, it can harm the horses and its owners, reducing the tourism industry in Yogyakarta. On the other hand, horseshoes demand is still met by small and medium enterprises (SME) without a well-standardized system. After doing technical testing to the existing horseshoe design, several alternative solutions were obtained for horseshoe redesign (1) by adding rubber pads and (2) serrated without rubber pads. Based on analysis and testing, it was found that horseshoe with the addition of rubber by 40% was able to increase the friction value to 0.54 or 10% from the initial condition. Besides improving the productivity and quality of SME horseshoe products, several solutions should be considered, including (1) change the layout design of SME by implementing 5S lean six sigma principles and (2) apply new methods/technology to maintain the standardization of horseshoe product. Implementation of both solutions will guarantee not only the quality product but also SME production. It is hoped that all the improvements that have been made will increase the quantity and quality of horseshoe products. Then it will also be able to improve the image of Yogyakarta City as a tourist city.
THE EFFECT OF 3D PRINTING MACHINE PARAMETERS IN EXTRUSION PROCESS OF BIOCOMPOSITE MATERIALS (PMMA AND HA) ON DIMENSIONAL ACCURACY Raeshifa Diani Almy; Alva Edy Tontowi
SINERGI Vol 22, No 2 (2018)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (530.128 KB) | DOI: 10.22441/sinergi.2018.2.003

Abstract

Bone implants are medical procedures involving replacement or reconstruction of missing or damaged bones with the patient's ones, natural substitutes or artificial substitutes. The widely used bone cement is a polymethylmethacrylate (PMMA) based composite material. To improve bioactivity, PMMA is combined with hydroxyapatite (HA). The manual formation can make bone implants during surgery. However, the method requires a longer operation time and raises the possibility of a higher error. Therefore, 3D printing technology is used to improve the quality of bone implants. One of the machines that can be used is the 3D printing machine, the property of the Product Design and Development Laboratory of Universitas Gadjah Mada. This machine needs to be tested to determine the accuracy of the prints, which is one indicator of product quality. Several machine parameters can be set in this machine setting. This study aims to determine the effect of three parameters, those are perimeter speed or edge print speed (20-40 mm / s), infill speed or inner print speed (50 - 70 mm / s), and fill angle or inner slope of inner printing (45 - 90 ° C). Before printing complex shapes, the machine was tested in advance with a more straightforward specimen design, which is a specimen design of flexural strength test. Response surface experiment design is used to determine the effect of three parameters on the dimensional accuracy which is measured through dimensional error. The results show that these three factors have no significant impact on the dimensional error, but the resulting error is still high. Therefore, it is necessary to adjust the design size before printing.
Co-Authors Agus Windharto Almy, Raeshifa Diani Amanda Nur Cahyawati Ambar Pertiwiningrum Andi Sudiarso, Andi Andy Nurul Yunita Pettalolo Angger Bagus Prasetiyo Anggita Gigih Wahyu Iriawan, Anggita Gigih Wahyu Anna Maria Sri Asih Aoyama, Hideki Arie Kurniawan Arie Kurniawan Arif Kusumawanto Arif Kusumawanto Arman Hakim Nasution Avin Fadilla Helmi Banu Santoso Bhawika, Gita Widi Budhi Sholeh Wibowo Budi Hartono Budi Hartono Budi Rochardjo, Heru Santosa Catur Sugiyanto Dawal, Siti Zawiah Md Dawi Karomati Baroroh Deendarlianto Dhananjaya Yama Hudha Kumarajati Dian Pribadi Perkasa Djoko Kuswanto Djoko Kuswanto Erizal Erizal Erni Suparti, Erni Ghazali, Ihwan Handiwibowo, Gogor Arif Hari Agung Yuniarto Herianto Heru Santoso Budi Rochardjo, Heru Santoso Budi Hideki Aoyama Ibnu Abdul Rosid IDAA Warmadewanthi Ihwan Ghazali Indarto Indarto Indrajati, Heppy Riani Jamasri . Joko Sedyono, Joko Joni Setiawan Joni Setiawan Kusmono Lilik Soetiarso Lina Dianati Fathimahhayati, Lina Dianati Mahardhika, Syaqila Erie Margaretha Arnita Wuri Marlyana, Novi Marsetyawan Heparis Nur Ekanda Soesatyo Marsetyawan HNE Soesatyo Mochammad Andy Rizqy Mochammad Noer Ilman Mochammad Taha Ma’ruf Mohamad Khoiru Rusydi Muhammad Kusumawan Herliansyah Muhammad Ridlwan Muhammad Shodiq Abdul Khannan Musyarofah, Siti Afiani Novi Marlyana Nugraha Muharafandy Nur Aini Masruroh Perttalolo, Andy Nurul Yunita Prabowo, Teguh Ari Putra, Gaustama Putra, Ikbal Rizki Raeshifa Diani Almy Rahardyan Magetsari Rahmanto, Nurdin Rama Atyasa Y Rashid, Salwa Hanim Abdul Rudy Firman Prakosa Salwa Hanim Abdul Rashid Sella Antesty Siti Afiani Musyarofah Siti Sunarintyas Siti Zawiah Md Dawal Slamet Widyanto, Slamet Soedarmanto Indarjulianto Soedarmanto Indarjulianto Soetiarso, Lilik Supriyatno Supriyatno Susilo Adi Widyanto Syawaluddin Adha Pohan Taufik Hidayat Taufik Hidayat Teguh Ari Prabowo Titis Wijayanto Tri Purwanti Wangi Pandan Sari Widiastuti, Maria Goreti Widowati Siswomihardjo Widyanto, Slamet A. Widyastuti Widyastuti Windharto, Agus Wiratni Wiratni, Wiratni Yanti Pasmawati Yeni Yustisia