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All Journal International Journal of Electrical and Computer Engineering Jurnal Energi Dan Manufaktur Nurse Media Journal of Nursing Makara Journal of Technology
RA. Koestoer
Department Of Mechanical Engineering, Faculty Of Engineering, University Of Indonesia, Depok 16424, Jawa Barat, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Nursing

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Effects of Acupoint Stimulation with Digital Massager of Oxytocin on the Breast Milk Production of Working Mothers Anggorowati, Anggorowati; Sutadi, Heriandi; Setyowati, Setyowati; Koestoer, Raldi Artono
Nurse Media Journal of Nursing Vol 6, No 2 (2016): (DECEMBER 2016)
Publisher : Department of Nursing, Faculty of Medicine, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (441.828 KB) | DOI: 10.14710/nmjn.v6i2.11726

Abstract

Background: Many breastfeeding mothers find that their milk production decreases or even stops when they return to work due to reduced breastfeeding hormones. Massage can stimulate the oxytocin hormone, and to replace the manual massage, a digital massager of oxytocin (DMO) is developed.Purpose: This study aimed to identify the effects of the DMO on the milk production of the breastfeeding working mothers.Methods: This study employed a quasi-experiment with pretest-posttest control group design. The samples were 93 breastfeeding working mothers in the community with a baby below 6 months. The samples were assigned into the intervention group (n=46) and the control group (n=47). An intervention of using the DMO was given to the mothers in the intervention group by applying the electrodes on the first intercostae of BL-17 and Bl-18 acupoints for 20 minutes in 3 consecutive days. Meanwhile, a standard treatment was given to the control group. Breast milk expression was carried out before and after the use of DMO. The data were analyzed using the Mann-Whitney and the Wilcoxon tests. Results: The results showed that there were differences in the volume of the expressed breast milk before and after the use of the DMO (p=0.00). The mothers in the intervention group increased their milk production on an average of 23 ml when other variables affecting the breastfeeding were controlled.Conclusion: The DMO stimulated and increased the milk production of working mothers. It can also be an alternative to the complementary therapy, especially for the nursing care management of breastfeeding mothers.
Denoising MAX6675 reading using Kalman filter and factorial design Reski Septiana; Ibnu Roihan; Raldi A. Koestoer
International Journal of Electrical and Computer Engineering (IJECE) Vol 11, No 5: October 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v11i5.pp3818-3827

Abstract

This paper aims to tune the Kalman filter (KF) input variables, namely measurement error and process noise, based on two-level factorial design. Kalman filter then was applied in inexpensive temperature-acquisition utilizing MAX6675 and K-type thermocouple with Arduino as its microprocessor. Two levels for each input variable, respectively, 0.1 and 0.9, were selected and applied to four K-type thermocouples mounted on MAX6675. Each sensor with a different combination of input variables was used to measure the temperature of ambient-water, boiling water, and sudden temperature drops in the system. The measurement results which consisted of the original and KF readings were evaluated to determine the optimum combination of input variables. It was found that the optimum combination of input variables was highly dependent on the system's dynamics. For systems with relatively constant dynamics, a large value of measurement error and small value of process noise results in higher precision readings. Nevertheless, for fast dynamic systems, the previous input variables' combination is less optimal because it produced a time-gap, which made the KF reading differ from the original measurement. The selection of the optimum input combination using two-level factorial design eased the KF tuning process, resulting in a more precise yet low-cost sensor.
Pengukuran Fluks Kalor Prosessor dengan Metode Simulasi Fluks Kalor Plat Datar Wayan Nata Septiadi; Nandy Putra; Engkos K; Raldi Artono Koestoer
Jurnal Energi Dan Manufaktur Vol 7 No 2 (2014): Oktober 2014
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.457 KB)

Abstract

Metode pengukuran dalam suatu penelitian di bidang perpindahan kalor khususnya pipakalor merupakan suatu hal yang sangat penting untuk bisa mendapatkan suatu data yangmemang akurat. Penelitian ini adalah untuk mendapatkan kondisi temperatur dan flukskalor pada permukaan plat pemanas yang mampu mewakili kondisi temperature dan flukskalor pada permukaan prosessor atau CPU. Penelitian ini meliputi tahap uji quasi steadystate, kalibrasi termokopel, pengukuran temperature permukaan CPU, karakterisasi platpemanan dan karakterisasi palt simulator. Dalam hal ini parameter yang dijadikan acuanpada plat simulator adalah temperature permukaan prosessor.Kata kunci: Pengukuran, Fluks kalor, ProsessorMeasurement methods in a research of the heat transfer especially the heat pipe is veryimportant to be able to get a really accurate data. This research is to obtain the conditions oftemperature and heat flux on the surface of the heating plate that capable of representingthe conditions of temperature and heat flux on the surface of the processor or CPU. Thisresearch includes the quasi steady state test phase, thermocouple calibration, CPU surfacetemperature measurement, characterization and characterization of heater plate andsimulator plate. In this case the parameters are used as reference in the simulator plate isthe surface temperature of processor..Keywords: Measurement, heat flux, processor
Potency of Thermoelectric Generator for Hybrid Vehicle Putra, Nandy; Koestoer, Raldi Artono; Adhitya, Mohammad; Roekettino, Ardian; Trianto, Bayu
Makara Journal of Technology Vol. 13, No. 2
Publisher : UI Scholars Hub

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Abstract

Potency of Thermoelectric Generator for Hybrid Vehicle. Thermoelectric Generator (TEG) has been known as electricity generation for many years. If the temperature difference occurred between two difference semi conductor materials, the current will flow in the material and produced difference voltage. This principle is known as Seebeck effect that is the opposite of Peltier effect Thermoelectric Cooling (TEC). This research was conducted to test the potential of electric source from twelve peltier modules. Then, these thermoelectric generators were applied in hybrid car by using waste heat from the combustion engine. The experiment has been conducted with variations of peltier module arrangements (series and parallels) and heater as heat source for the thermoelectric generator, with variations of heater voltage input (110V and 220V) applied. The experimental result showed that twelve of peltier modules arranged in series and heater voltage of 220V generated power output of 8.11 Watts with average temperature difference of 42.82°C. This result shows that TEG has a bright prospect as alternative electric source.
Co-Authors - Anggorowati Agus S. Pamitran, Agus S. Ardian Roekettino Ardian Roekettino, Ardian Bayu Trianto Bayu Trianto, Bayu Engkos A. Kosasih, Engkos A. Engkos K Heriandi Sutadi Ibnu Roihan Luh Putu Ratna Sundari Mohammad Adhitya, Mohammad Muhammad Idrus Alhamid, Muhammad Idrus Nandy Putra Nandy Putra Reski Septiana Sentot Novianto, Sentot Setyowati Setyowati Wayan Nata Septiadi