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Biomodeling Normal Delivery Process and monitoring at Kala I and II at parturition Simulator Mulyati, Sri; Gondokaryono, Yudi Satria; Rohman, Arief Syaichu
Jurnal Riset Kesehatan Vol 2, No 3 (2013): September 2013
Publisher : UPPM Politeknik Kesehatan Kementrian Kesehatan Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4241.514 KB)

Abstract

Labor process is complex. Anatomically and physiologically must be monitored during labor process. Normal labor case is higher than labor with medical interventional. In Indonesia, labor process training still used conventional simulation media. The simulation can’t determined about labor process and monitoring during labor process. Thus, model that can simulate of labor process and monitoring during labor process in stage I and II must be provided This research expected to contribute in learning media to simulate normal labor process and monitored during labor process in stage I and II. Biomodeling expected to provide understanding about labor process, stage of labor, and monitoring during labor process. This research conducted with approach method scenario based model for simulate gameplay for normal labor process and monitoring in stage I and II. Based on literature about reproductive system organ and physiological, also must be monitored about physiological change during labor process with partograf  WHO standard and analyze parameter to determined labor process closely with the reality. Beside that, theory of labor process and pushing in contraction also be analyze  to find the basic formula from physic and mathematical concept. From the basic formula, modified basic formula for scenario gameplay simulation of normal labor process and monitoring in stage I and II.The result of this research was produce biomodeling to determine normal labor process, the stage of labor, and physiological monitoring for report that monitored appropriate with WHO partograf standard. This biomodeling expected become learning and training media for midwivery and doctor include student of medical and midwifery. Model that is produce from this research can be develop to abnormal labor process (medical interventional) include labor complication.
Perancangan Pengendali Proportional-Integral Anti-Windup (Pi-Aw) pada Simulator Mobil Listrik untuk Kendali Kecepatan dan Torsi Al Tahtawi, Adnan Rafi; Rohman, Arief Syaichu
ELECTRANS Vol 14, No 1 (2016): Volume 14, Nomor 1, Tahun 2016
Publisher : Universitas Pendidikan Indonesia

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Abstract

Proportional-Integral (PI) controller will be designed on electric car simulator for speed and torque control systems. The main components of this simulator are two direct current motors (DCMs) with a linked axis of rotation. Speed and torque control systems are designed for DCM 1 and DCM 2 which are represents the electric car and its load. PI controller is designed in three schemes: linear PI, PI with saturation and PI with anti-windup (PI-AW). The simulation result shows that the PI-AW scheme produces the best responses for speed and torque with control signals generated doesn’t exceed the saturation limit. 
Simple supercapacitor charging scheme of an electric vehicle on small-scale hardware simulator: a prototype development for education purpose Al Tahtawi, Adnan Rafi; Rohman, Arief Syaichu
Journal of Mechatronics, Electrical Power, and Vehicular Technology Vol 7, No 2 (2016)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (225.7 KB) | DOI: 10.14203/j.mev.2016.v7.77-86

Abstract

Supercapacitor is one of electrical energy sources that have faster charging-discharging times when compared to other power sources, such as battery and fuel cell. Therefore, it is often used as an additional power source in an electric vehicle. In this paper, a prototype of small-scale electric vehicle simulator (EVS) is built and a simple charging scheme of supercapacitor is used for education purpose. EVS is an electric vehicle prototype which can show the vehicle’s powertrain on small-scale configuration. Main components of this device are two direct current motors (DCMs) with a linked axis of rotation. Therefore one of them will be able to act as a generator. The supercapacitor charging scheme is employed by controlling the relays. The hardware experimental result shows that the averages of charging current are proportional to the maximum slope angle of the road profiles. This scheme is simple due to the EVS utility and it is useful for education purpose.
Designing optimal speed control with observer using integrated battery-electric vehicle (IBEV) model for energy efficiency Ristiana, Rina; Rohman, Arief Syaichu; Rijanto, Estiko; Purwadi, Agus; Hidayat, Egi; Machbub, Carmadi
Journal of Mechatronics, Electrical Power, and Vehicular Technology Vol 9, No 2 (2018)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3981.796 KB) | DOI: 10.14203/j.mev.2018.v9.89-100

Abstract

This paper develops an optimal speed control using a linear quadratic integral (LQI) control standard with/without an observer in the system based on an integrated battery-electric vehicle (IBEV) model. The IBEV model includes the dynamics of the electric motor, longitudinal vehicle, inverter, and battery. The IBEV model has one state variable of indirectly measured and unobservable, but the system is detectable. The objectives of this study were: (a) to create a speed control that gets the exact solution for a system with one indirect measurement and unobservable state variable; and (b) to create a speed control that has the potential to make a more efficient energy system. A full state feedback LQI controller without an observer is used as a benchmark. Two output feedback LQI controllers are designed; including one controller uses an order-4 observer and the other uses an order-5 observer. The order-4 observer does not include the battery state of charge as an observer state whereas the order-5 observer is designed by making all the state variable as the observer state and using the battery state of charge as an additional system output. An electric passenger minibus for public transport with 1500 kg weight was used as the vehicle model. Simulations were performed when the vehicle moves in a flat surface with the increased speed from stationary to 60 km/h and moves according to standard NEDC driving profile. The simulation results showed that both the output feedback LQI controllers provided similar speed performance as compared to the full state feedback LQI controller. However, the output feedback LQI controller with the order-5 observer consumed less energy than with the order-4 observer, which is about 10% for NEDC driving profile and 12% for a flat surface. It can be concluded that the LQI controller with order-5 observer gives better energy efficiency than the LQI controller with order-4 observer
Sistem Kendali Kendaraan untuk Keselamatan Aktif: Review Paper Ristiana, Rina; Rohman, Arief Syaichu; Prihatmanto, Ary Setijadi; Machbub, Carmadi
TELKA - Telekomunikasi, Elektronika, Komputasi dan Kontrol Vol 3, No 1 (2017): TELKA
Publisher : Jurusan Teknik Elektro UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (742.254 KB) | DOI: 10.15575/telka.v3n1.1-12

Abstract

Telah dilakukan telaah makalah mengenai sistem kendali untuk meningkatkan keselamatan berkendaraan. Sistem kendali ditentukan pada low level yang berfungsi untuk menjaga kestabilan kendaraan. Kendaraan dijelaskan dalam bentuk dinamika dan sistem pemindah daya. Permasalahan sistem kendali pada mobil listrik terletak pada ketersediaan energi baterai yang mempengaruhi kestabilan kendaraan, sehingga perlu optimisasi efisiensi energi.
Desain Kendali Optimal Konsumsi Energi Pada Sistem Mobil Listrik Untuk Model Sistem Linier Ristiana, Rina; Rohman, Arief Syaichu; Prihatmanto, Ary Setijadi; Machbub, Carmadi
TELKA - Telekomunikasi, Elektronika, Komputasi dan Kontrol Vol 4, No 1 (2018): TELKA
Publisher : Jurusan Teknik Elektro UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (525.227 KB) | DOI: 10.15575/telka.v4n1.1-10

Abstract

Telah dirancang metoda kendali optimal konsumsi energi pada sistem mobil listrik untuk model sistem linier dengan menggunakan metoda calculus of variations. Sebuah representasi konseptual sistem nyata dari mobil listrik digambarkan dalam bentuk model dan persamaan matematik. Model sistem mobil listrik terdiri dari dinamika kendaraan dan dinamika motor listrik. Berdasarkan model sistem tersebut dapat dirumuskan tiga alternative indeks kinerja dan metoda hokum kendali. Sebagai salah satu contoh kasus, dipilih persamaan indeks kinerja alternative 1 untuk mendapatkan alternative metode kendali optimal. Hasil akhir yang diinginkan didasarkan pada suatu solusi konsumsi energi minimum dengan memilih vector kendali yang masih memenuhi constraint dan masih menjamin kestabilan sistem.
Interpretasi Global Hadis Rukyat Hilal Rusmin, Pranoto Hidaya; Rohman, Arief Syaichu; Herdiwijaya, Dhani; Khaerani, Izzah Faizah Siti Rusydati; Pahlevi, Reza; Darmawan, Dadang
Mutawatir : Jurnal Keilmuan Tafsir Hadith Vol 7 No 1 (2017): JUNI
Publisher : Program Studi Perbandingan Agama, Fakultas Ushuluddin dan Filsafat, Universitas Islam Negeri (UIN) Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (619.584 KB) | DOI: 10.15642/mutawatir.2017.7.1.50-75

Abstract

Before Islamic Calendar begins, Muslims were used to wait for the earliest visible crescent (hilâl), which marks the beginning of Ramadan. The determination of the beginning of Ramadan is based on the rukyat al-hilâl hadith. Because the hilâl visibility on the earth surface is not the same, it results the differences on the beginning of Ramadan fasting. In addition, the sighting hilâl method can only determine the next 29 days, it cannot reach for the next month and even for the next year. These are the main reasons for re-interpretation of the rukyat al-hilâl hadith from global perspective. From this study, it is found that the context in the Qur’an, related to the Ramadan fasting, is fasting in one full month, 29 or 30 days, according to the duration of the lunar synodic cycle. However, the condition of the people and the science at that time has not developed yet, which is the cause of calculation (h}isâb) verses in the Qur’an cannot be used. When they have developed, the calculation verses in the Qur’an can be used to determine the number of days in a calendar month. This will produce a global calendar for mankind.
Desain dan Implementasi Inverter Satu Fasa 400 Watt dengan Metode Switching High Frequency Ismiyadinata, Jauhar; Yuliansyah, Harry; Aziz, Muhammad Reza Kahar; Rohman, Arief Syaichu
Journal of Science and Applicative Technology Vol 3 No 1 (2019): Journal of Science and Applicative Technology August Chapter
Publisher : Lembaga Penelitian, Pengabdian Masyarakat, dan Penjaminan Mutu (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v3i1.121

Abstract

This article proposes a design of 400 watt inverter with frequency of 50 Hz at voltage of 12 Vdc input and 220 Vac output. This inverter is designed to convert the Direct Current (DC) into Alternating Current (AC) voltage with the purpose to utilize DC electricity generated by renewable energy. Hence, the energy can be employed as the replacement of the commercial electricity. In this research, the inverter is designed with the use of Switching High Frequency (SHF) method as the amplifier system applied for step up input voltage. Besides, the proposed inverter also utilizes the Sinusoidal Pulse Width Modulation (SPWM) method as the driver resulting the output signal in the form of pure-sine-wave. Furthermore, the switching system for SHF method in this research employs Arduino nano as the control and EGS002 as the SPWM driver. To obtain the real data, the examination is performed with connecting the inverter directly to the load, e.g., bulb, fan, and solder. Finally, the examination and analysis of the implementation result confirm that the design works well and fulfills the expected specification. Hence, this inverter design can be expected to provide the scientific contribution and applied for renewable energy especially in Indonesia, and generally in the world. Keywords: Arduino, DC-AC Inverter, SHF, Solar Cell, SPWM