Comparison Electricity Consumption Factors in Developing Country and Developed Country – A Case Example between Indonesia and South Korea

Sasmito Hendy Ginanjar(사스미트 헨디 기난자르),Park Soo-jin(박수진),Yoon Yong-beum(윤용범) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.7

Molecular dynamics simulations of oxide surfaces in water

S. C. Hendy 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4

We conducted constant volume molecular dynamics simulations of water conned by stainless steel slabs. We used polarizableshell model for both the oxide slabs and the water molecules, with non-Coulombic intermolecular forces modelled by Buckinghampotentials. Time-averaged trajectories clearly showed the presence of layering in the density of the water molecules perpendicular tothe slabs. There was also a corresponding ordering in orientation of the water molecules perpendicular to the slabs.

FRACTIONAL CHEBYSHEV FINITE DIFFERENCE METHOD FOR SOLVING THE FRACTIONAL BVPS

Khader, M.M.,Hendy, A.S. The Korean Society for Computational and Applied M 2013 Journal of applied mathematics & informatics Vol.31 No.1

In this paper, we introduce a new numerical technique which we call fractional Chebyshev finite difference method (FChFD). The algorithm is based on a combination of the useful properties of Chebyshev polynomials approximation and finite difference method. We tested this technique to solve numerically fractional BVPs. The proposed technique is based on using matrix operator expressions which applies to the differential terms. The operational matrix method is derived in our approach in order to approximate the fractional derivatives. This operational matrix method can be regarded as a non-uniform finite difference scheme. The error bound for the fractional derivatives is introduced. The fractional derivatives are presented in terms of Caputo sense. The application of the method to fractional BVPs leads to algebraic systems which can be solved by an appropriate method. Several numerical examples are provided to confirm the accuracy and the effectiveness of the proposed method.

Memory response in elasto-thermoelectric spherical cavity

El-Attar, Sayed I.,Hendy, Mohamed H.,Ezzat, Magdy A. Techno-Press 2020 Coupled systems mechanics Vol.9 No.4

A mathematical model of electro-thermoelasticity subjected to memory-dependent derivative (MDD) heat conduction law is applied to a one-dimensional problem of a thermoelectric spherical cavity exposed to a warm stun that is an element of time in the presence of a uniform magnetic field. Utilizing Laplace transform as an instrument, the issue has been fathomed logically within the changed space. Numerical inversion of the Laplace transform is carried for the considered distributions and represented graphically. Some comparisons are shown in the figures to estimate the effects of MDD parameters and thermoelectric properties on the behavior of all considered fields.

Fractional Chebyshev finite difference method for solving the fractional BVPs

M. M. Khader,A. S. Hendy 한국전산응용수학회 2013 Journal of applied mathematics & informatics Vol.31 No.1

In this paper, we introduce a new numerical technique which we call fractional Chebyshev finite difference method (FChFD). The algorithm is based on a combination of the useful properties of Chebyshev polynomials approximation and finite difference method. We tested this technique to solve numerically fractional BVPs. The proposed technique is based on using matrix operator expressions which applies to the differential terms. The operational matrix method is derived in our approach in order to approximate the fractional derivatives. This operational matrix method can be regarded as a non-uniform finite difference scheme. The error bound for the fractional derivatives is introduced. The fractional derivatives are presented in terms of Caputo sense. The application of the method to fractional BVPs leads to algebraic systems which can be solved by an appropriate method. Several numerical examples are provided to confirm the accuracy and the effectiveness of the proposed method.

Diffuse flow characteristics and their relation to hydrochemistry conditions in the Petoyan Spring, Gunungsewu Karst, Java, Indonesia

Tjahyo Nugroho Adji,Eko Haryono,Hendy Fatchurohman,Roza Oktama 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.3

This study was conducted on the Petoyan Spring, one of the most important springs in the western part of Gunung Sewu Karst, Java, Indonesia. The main purpose of the study is to define the diffuse flow characteristics of the spring. It also focuses on identifying the relationship between the diffuse flow proportion and several hydrochemical parameters to provide a better aquifer characterization. Water-level monitoring and discharge measurements were conducted over an eight months period in order to define the discharge hydrograph. The calculation of recession constants, including the diffuse flow (Kb), fissure flow (Ki), and conduit flow (Kc), was done by selecting several flood hydrograph events. Furthermore, the base flow-separation analysis was conducted to determine the diffuse flow proportion throughout the research period. Water sampling for hydrogeochemical analysis was taken every week and every hour for two selected flood events. A bivariate plot analysis between the diffuse flow proportion and certain hydrochemical parameters was made in order to describe the hydrogeochemical processes. The results showed that the diffuse- flow significantly dominates the spring discharge during non-flooding and flooding recession periods. Conversely, during the rising limb period, the diffuse proportion decreased drastically due to the conduit flow supply. This fact was also supported by the high Kb and short Tp (time to peak) and Tb (time to base flow) values. Hydrogeochemically the correlation between the diffuse flow proportion and major dissolved elements during the flood recession periods was strong because the conduit flow domination was replaced by the diffuse flow, causing the domination of water-rock interaction. According to the diffuse flow and its relation to its hydrochemistry, it is apparent that small fractures in the Petoyan Spring aquifer still provide good storage for the diffuse flow, even though the conduit fracture has already been developed.

Information and Communication Technology Adoption in Small- and Medium-Sized Enterprises: Demographic Characteristics

KUSUMA, Hadri,MUAFI, Muafi,AJI, Hendy Mustiko,PAMUNGKAS, Sigit Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10

This study examines the acceptance factors, barriers, benefits, and strategies for resolving Information and Communication Technology (ICT) adoption and usage problems based on the different demographic characteristics of SMEs. The demographic characteristics investigated are gender, educational qualifications, age, managerial status, and years of business experience. To the best of our knowledge, this paper is the first to examine a more comprehensive demographic characteristics in the context of ICT adoption. A survey using self-administered questionnaires was conducted to retrieve information from SME owners/managers in Pekalongan, the local city of Indonesia. The items in the questionnaire were discussed with various experts in the field and a pilot study was conducted prior to the distribution of the research instrument. The study made some interesting findings. No significant differences were found in the SMEs' adoption factors between the demographics of gender groups and educational qualifications. However, significant disparities were found to exist among the age compositions, managerial status, and years in business. Additionally, younger managers/owners of SMEs find it easier to understand the background factors of ICT adoption. Lastly, older managers/owners are more likely to stick to the organizational status quo, be less able to learn new technology, and more likely to avoid risky decisions.

PHOTOMETRIC STUDY OF IC 2156

A. L. Tadross,Y. H. M. Hendy 한국천문학회 2016 Journal of The Korean Astronomical Society Vol.49 No.2

We present an optical {\it UBVRI} photometric analysis of the poorly studied open star cluster IC 2156 using Sloan Digital Sky Survey data in order to estimate its astrophysical properties. We compare these with results from our previous studies that relied on the 2MASS JHK near-infrared photometry. The stellar density distributions and color-magnitude diagrams of the cluster are used to determine its geometrical structure, real radius, core and tidal radii, and its distance from the Sun, the Galactic plane, and the Galactic center. We also estimate, the age, color excesses, reddening-free distance modulus, membership, total mass, luminosity function, mass function, and relaxation time of the cluster.

Antibiotic Spacers in Shoulder Arthroplasty: Comparison of Stemmed and Stemless Implants

Eric M Padegimas,Alexia Narzikul,Cassandra Lawrence,Benjamin A Hendy,Joseph A Abboud,Matthew L Ramsey,Gerald R Williams,Surena Namdari 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.4

Background: Antibiotic spacers in shoulder periprosthetic joint infection deliver antibiotics locally and provide temporary stability. The purpose of this study was to evaluate differences between stemmed and stemless spacers. Methods: All spacers placed from 2011 to 2013 were identified. Stemless spacers were made by creating a spherical ball of cement placed in the joint space. Stemmed spacers had some portion in the humeral canal. Operative time, complications, reimplantation, reinfection, and range of motion were analyzed. Results: There were 37 spacers placed: 22 were stemless and 15 were stemmed. The stemless spacer population was older (70.9 ± 7.8 years vs. 62.8 ± 8.4 years, p = 0.006). The groups had a similar percentage of each gender (stemless group, 45% male vs. stemmed group, 40% male; p = 0.742), body mass index (stemless group, 29.1 ± 6.4 kg/m2 vs. stemmed group, 31.5 ± 8.3 kg/m2; p = 0.354) and Charlson Comorbidity Index (stemless group, 4.2 ± 1.2 vs. stemmed group, 4.2 ± 1.7; p = 0.958). Operative time was similar (stemless group, 127.5 ± 37.1 minutes vs. stemmed group, 130.5 ± 39.4 minutes). Two stemless group patients had self-resolving radial nerve palsies. Within the stemless group, 15 of 22 (68.2%) underwent reimplantation with 14 of 15 having forward elevation of 109º ± 23º. Within the stemmed group, 12 of 15 (80.0%, p = 0.427) underwent reimplantation with 8 of 12 having forward elevation of 94º ± 43º (range, 30º to 150º; p = 0.300). Two stemmed group patients had axillary nerve palsies, one of which self-resolved but the other did not. One patient sustained dislocation of reverse shoulder arthroplasty after reimplantation. One stemless group patient required an open reduction and glenosphere exchange of dislocated reverse shoulder arthroplasty at 6 weeks after reimplantation. Conclusions: Stemmed and stemless spacers had similar clinical outcomes. When analyzing all antibiotic spacers, over 70% were converted to revision arthroplasties. The results of this study do not suggest superiority of either stemmed or stemless antibiotic spacers.

Specific ion binding influences on surface potential of chromium oxide

A. N. Parbhu,J. Soltis,L. Q. Chen,J. Atkin,S. Hendy 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4

Colloidal force measurements as a function of pH can yield the isoelectric point (IEP) of a surface immersed in an electrolyte. Thecondition of surface charge-potential regulation imposed by the potential-dependent binding of Hþ and counter-ions at the interfacemakes a detailed analysis of the electrostatic force non-trivial. In the current study, the specic ion binding of phosphate ions on tochromium oxide has been investigated. An atomic force microscope (AFM) has been used to measure the force of interactionbetween a SiO2 sphere (. 5 m diameter) and a chromium oxide surface in aqueous media of sodium phosphate buer or sodiumchloride over the pH range 311. From the force separation proles the force at.Jump To’ is plotted over the pH range studied foreach ionic strength. As the IEP of SiO2 is around pH 2 the probe interaction with the surface measures its electrostatic properties,and hence can be used to determine the IEP. The comparison of force titration plots shows the IEP of the chrome surface decreaseswith increasing phosphate ion concentration, from around pH 8 with no phosphate ions present, down to around pH 6 at 0.01 Mionic strength phosphate buer. This indicates that there is specic ion binding of the phosphate to the chrome oxide surface. Wehave used approach of DLVO theory, together with a simple model of specic adsorption of ions at the oxidewater interface, tomodel the long range electrostatic repulsion force measured by the force separation plots at each pH and ionic strength. Bycomparing this model to the isoelectric points at several ionic strengths, we can estimate surface dissociation constants for theadsorption of protons and phosphate from the electrolyte.