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All Journal Jurnal ULTIMA Computing Journal Social Science And Technology For Community Service
Samuel Hutagalung
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Engineering Environmental Science Languange, Linguistic, Communication & Media

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Journal : Jurnal ULTIMA Computing

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Studi Pendahuluan Perancangan Desain Tangan Mekatronika Untuk Bedah Umum Jarak Jauh Julando Omar; Jason Kho; Samuel Hutagalung
Ultima Computing : Jurnal Sistem Komputer Vol 12 No 2 (2020): Ultima Computing : Jurnal Sistem Komputer
Publisher : Faculty of Engineering and Informatics, Universitas Multimedia Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31937/sk.v12i2.1777

Abstract

During the current situation, the availability of surgeons in remote areas is limited. There is a need to be still able to perform general operations without the doctor being physically present in the operating room. This research is a preliminary study of designing a remotely controlled mechatronic hand to perform general surgery. With this design, it is hoped that in the future, the physical presence of doctors will no longer be an obstacle in achieving general surgery in locations that are difficult to reach.
Water Flow & Temperature Control to Increase Extraction Yield of Light-roasted Coffee Beans Samuel Hutagalung
Ultima Computing : Jurnal Sistem Komputer Vol 14 No 2 (2022): Ultima Computing : Jurnal Sistem Komputer
Publisher : Faculty of Engineering and Informatics, Universitas Multimedia Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31937/sk.v14i2.2810

Abstract

Using light-roasted coffee beans for brewing espresso poses a general problem for pump-based espresso machines. Soluble in light-roasted coffee beans is more challenging to extract and requires a higher EY percentage because it has a relatively higher acidity level than dark-roasted coffee beans. The extraction range of 18% - 22% in light-roasted coffee beans for espresso brewing with an 8% - 12% TDS is qualitatively considered insufficient to produce espresso with a balanced taste. To improve the extraction ability of the espresso machine on coffee soluble. We design two features that hypothetically can solve the problem: Temperature Control Module to increase water temperature stability as a replacement for the thermostat, and Flow Control Module to regulate the speed of the vibration pump by adjusting the voltage resistance to reduce the water pressure/ flow rate used during the initial extraction at the preinfusion phase. Based on the results of trials using an espresso machine that has added temperature and flow control modules, there is an increase in the average percentage of extraction compared to the results of trials using stock machines; the average extraction percentage increased by 4.83 points. Qualitatively, this increase of %EY also significantly impacts the espresso taste, which tasted very sour and unbalanced, became relatively more balanced and comfortable to enjoy.
Co-Authors Agung Deni Wahyudi Anton Mahendra Damayanti Damayanti Jason Kho Julando Omar M Ghufroni An'ars M. Ghufron An’Ars Musa Paradisiaca Nirwana Hendrastuty Selamet Samsugi