Ta Hwa University of Science and Technology

A noisy signal converts the signal to another signal containing fluctuation called signal fluctuation. This fluctuation in signal is a common factor in signal processing. In this article, we introduce a Local Meshless Collocation Method (LMCM) for the numerical solution of the Euler- Lagrange Partial Differential Equation (EL-PDE) associated with the Total Variation (TV)-based model for removing additive noise from the given data signals. This method uses the mul-ti-quadric Radial Basis Function (MQ-RBF) as the basis function. These features will eliminate the fluctuations from the given noisy signals well due to the meshless applications used in the suggested method. The experimental result demonstrates that the proposed LMCM will perform well in terms of Signal to Noise Ratio (SNR) compared to another traditional mesh-based scheme for different basis functions.

The objective of this study is to ascertain the causal correlation between government expenditure, household consumption, and labor force engagement on the economic advancement of districts/cities in East Java Province during the period from 2014 to 2020.The employed analytical technique is panel data regression utilizing a Fixed Effect methodology.The research reveals that the economic growth of East Java Province is influenced by three independent variables: government expenditure, household expenditure, and labor force participation rate of 98.7%.The high and low values of these variables correspond to the high and low economic growth of the province.Future research recommendations should aim to exert a direct or indirect impact on the economic growth of the city districts in East Java province.

PT. XYZ merupakan perusahaan yang bergerak dibidang produksi spare part dan aksesoris otomotif khusunya sepeda motor. Permasalahan yang dihadapi perusahaan yaitu sering terjadinya kerusakan pada mesin CNC Milling A dengan jumlah kerusakan 32 kali selama tahun 2017 hingga 2018. Perusahaan menerapkan kegiatan preventive maintenance dan corrective maintenance namun kegiatan maintenance ini tidak berjalan dengan optimal. Oleh karena itu, dilakukan pengembangan sistem pemeliharaan untuk meningkatkan keandalan mesin. Metode yang digunakan yaitu Reliability Centered Maintenance (RCM) dengan tujuan menentukan interval waktu pemeliharaan dan estimasi biaya pemeliharaan yang efisien. RCM dilakukan dengan menganalisis kegagalan dengan analisis FMECA. Hasil dari analisis ini berupa nilai RPN yang menunjukkan komponen bearing rel, bearing spindle dan selang sebagai komponen kritis pada sistem. Kemudian ditentukan kebijakan maintenance dengan hasil 2 scheduled on-condition task, 2 scheduled restoration dan 2 scheduled discard task dengan interval waktu maintenance sesuai dengan kategori task. Melalui metode RCM, PT.XYZ dapat menghemat biaya pemeliharaan sebesar Rp. 51.800.331

This paper presents a novel method to enhance the system stability of a digital controller for a switching power converter under one-comparator counter-based sampling based on higher sampling frequency. However, the sampling rate and the hardware are not changed. The measured results of the proposed strategy are presented to demonstrate this concept.

Indonesian Maternal Mortality Ratio (MMR) based on the Survei Demografi Kesehatan Indonesia (SDKI) in 2012 is 356/100.000 live birth whereas the target of Sustainable Development Goals (SDG’s 70/100,000 live birth by 2030. A decent labor assistance in both vaginal and sectio caesarean labor is necessary in reducing MMR. This study aimed to analyze the relationship between maternal age, parity and payment method with labor through caesarean section. This is an observational analytic study using cross sectional design. The data was obtained through secondary data from medical record. During 2017 there were 183 caesarean sections in RSUD Lembang as our research location. The data was analyzed univariately and bivariately by using Chi Square test (?=0.05). The results shows that factors associated with caesarean labor are maternal age (p=0.032; OR=4.617), parity (p=0.035; OR=4.442) and payment method (p=0.036; OR=4.417). It can be concluded that maternal age, parity and payment method affect caesarean labor.
 
 Keywords: caesarean labor, caesarean section, age, parity, payment method

In this paper, the compensator for the CCM voltage-mode boost converter is selected and designed. First, by using Mathcad, the type 1, type 2, and type 3 compensators are analyzed and developed from the basics. From the compensator analysis, one can know why the type 3 compensator is suitable for the CCM voltage-mode boost converter. Second, by selecting the type 3 compensator, which provides the required phase margin boost, the parameters of the type 3 compensator can be obtained. Finally, the effectiveness of the closed-loop load transient response of the boost converter is verified by Mathcad and PSIM.

Composite materials have gained increasing popularity over the past few decades due to their superior mechanical properties, such as high strength-to-weight ratio, fighting against high temperature and corrosion resistance. The assembly of enormous aeronautical components and structures require the machining of composite materials. Drilling is the most important hole-making process in the final assembly. When drilling composite materials, a number of defects are generating. Delamination caused by drilling thrust has been showed as one of the most problematic defects after drilling composite laminates. With a pressing need for decreased delamination, many studies are turning more and more toward tool geometry and machining parameters. Drilling of composite plates using a step core-ball drill, which is a special drill to improve the chip flow and reduces the thrust force at the exit of hole, is investigated in this study. The experimental results found that the step core-ball drill was efficient in drilling of carbon fiber reinforced plastic (CFRP) and did not produce loading on the drill exit at the proper drilling conditions. The results obtained from this study feeding back for fundamental research efforts could steer future studies on the drilling composite materials in the most promising direction.

This paper presents a system augmentation-based unbiased minimum-variance input and state estimation for systems with unknown inputs which can be reconstructed with a multi-step delay. An estimable input generating model (EIGM)-based system augmented approach is proposed to facilitate the filter design. It is shown that, via this new filtering approach the optimal unknown input and state estimation can be simultaneously achieved through the previously proposed robust two-stage Kalman filter (RTSKF). An illustrative example is given to show the effectiveness of the proposed results.