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Muhamad Luqman KHALIL(Muhamad Luqman KHALIL ),Norzalita Abd AZIZ(Norzalita Abd AZIZ ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.2
This study aims to address the literature gap by examining the direct relationship between big data analytics capability, marketing innovation, and organizational innovations. Additionally, this study would examine big data analytics capability as the antecedent for both innovation types and how these relationships influence firm performance. The research model is developed based on the integration of resource-based view and knowledge-based view theories. The quantitative method is used as the research methodology for this study. Based on a purposive sampling method, a total of 115 questionnaires were obtained from managers in star-rated hotels located in Malaysia. Partial least square structural equation modeling (PLS-SEM) is utilized for the data analysis. The result shows that big data analytics capability positively affects marketing and organizational innovations. The findings show that big data analytics capability and organizational innovation positively influence firm performance. Nonetheless, the result revealed that marketing innovation is not positively related to firm performance. The findings also indicate to hotel managers the importance of big data analytic capability and the resources required to build and develop this capability. The contributions from this study enrich the literature on big data and innovation, which is particularly limited in the hospitality and tourism context.
Three-Phase PWM-Switched Autotransformer Voltage-Sag Compensator Based on Phase AngleAnalysis
Muhamad Mansor,Nasrudin Abd. Rahim 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.6
Many voltage sag compensators have been introduced, including the traditional dynamic voltage restorer (DVR), which requires an energy storage device but is inadequate for compensating deep and long-duration voltage sags. The AC-AC sag compensators introduced next do not require a storage device and they are capable of compensating voltage sags. This type of compensator needs an AC-AC converter to regulate the output voltage. Presented in this paper is a three-phase PWM-switched autotransformer voltage sag compensator based on an AC-AC converter that uses a proposed detection technique and PWM voltage control as a controller. Its effectiveness and capability in instantly detecting and compensating voltage sags were verified via MATLAB/Simulink simulations and further investigated through a laboratory prototype developed with a TMS320F2812 DSP as the main controller.
Muhamad Maulana Azimatun Nur,Tutik Muji Setyoningrum,I Gusti Suinarcana Budiaman 대한환경공학회 2017 Environmental Engineering Research Vol.22 No.4
Indonesia is known as the largest oil palm producer in the world. However, along with the production, it generates wastes and pollution that caused the environmental problem in surrounding areas. Previous researchers reported that the high palm oil mill effluent (POME) concentration inhibited microalgae growth. However, the inhibition factor was not clearly explained by using kinetic model. This study presents kinetic models of Botryococcus braunii (B. braunii) cultivated on POME wastewater under different turbidity condition. Results showed that the growth model of Zwietering was closely suitable with experimental results. It was found that B. braunii was able to consume organic carbon from the POME wastewater on the logarithmic model. A modified kinetic model of Monod Haldane described the influence of turbidity and chemical oxygen demand on the cultivation. Turbidity of POME medium inhibited the growth rate at KI 3.578 and KII 179.472 NTU, respectively. The Lipid (39.9%), and carbohydrate (41.03%) were found in the biomass that could be utilized as biofuel source.
Muhamad YUNANTO,Henny MEDYAWATI 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6
The purpose of this study is to analyze the contribution of exchange rates, Bank Indonesia Certificate (SBI), and global stock price indexes toward the Composite Stock Price Index (IHSG), and the shocks caused by the global index to the IHSG. The research variables are HSGI, rupiah exchange rate, and global stock price index, which includes NASDAQ, the Hong Kong stock price index (Hang Seng), the Japanese stock price index (Nikkei 225), and the South Korean stock price index (Kospi). The data used is monthly time-series data from 2008 to 2019. The data used in this study are secondary data obtained from Bank Indonesia publications through www.bi.go.id, the Indonesia Stock Exchange, and Yahoo Finance (finance.yahoo.com). Following the type of data used, the research steps include the unit root test, cointegration test, and estimation using the Vector Error Correction Model (VECM). Based on the results of the impulse response and variance decomposition analysis, it can be seen that the overall global index, exchange rates, and SBI interest rates contributed to the IHSG movement. Based on the analysis of variance decomposition, the percentage value of the contribution of the Hang Seng index is the biggest compared to the NASDAQ, Nikkei 225, and Kospi.
Muhamad Ikhlasul Amal,이상현,김규호 한국물리학회 2014 Current Applied Physics Vol.14 No.7
The pentenary system, Cu2ZnSn(SxSe1x)4 (CZTSSe), is a promising alternative for thin film solar cells. In this study, CZTSSe thin films were prepared using a two-stage process involving the thermal diffusion of sulfur (S) and selenium (Se) vapors into sputtered metallic precursors at approximately 450 C. The effects of the sulfur content on the composition, structure, optical and electrical characteristics of the CZTSSe thin films were investigated. The films showed a kesterite structure with a predominant (112) orientation. X-ray diffraction and Raman spectroscopy confirmed the formation of a single phase CZTSSe compound. The band gap was dependent on the sulfur content and was calculated to be 1.25 eV, 1.33 eV and 1.40 eV for CZTSSe films with a S/(S þ Se) ratio of 0.3, 0.5 and 0.7, respectively. All films exhibited ptype semiconductor properties.
Muhamad I. Amal,김규호 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.11
Cu2ZnSnS4 (CZTS) films were prepared by using the sulfurization of sputtered metallic precursors. The compositional ratio of the CZTS films was slightly different compared to their initialmetallic precursors due to elemental loss during annealing. The Cu/(Zn+Sn) ratio for the CZTS-1, CZTS-2 and CZTS-3 films were 0.91, 1.06 and 1.21, respectively. In addition, all films had acompositional ratio of Zn/Sn >1. The grain sizes of the CZTS films increased with increasing Curatio. X-ray diffraction and Raman spectroscopy showed that the CZTS films with an excess ofcopper and zinc had secondary phases of Cu2SnS3 and ZnS. The optical band gap and absorptioncoefficient for all CZTS films in the range of the experimental compositions were calculated to be 1.5eV and >104 cm−1, respectively. The presence of secondary phases related to compositional ratioin the CZTS films influenced the electrical properties. The CZTS-1 film with a Cu-poor and Zn-richcomposition whose a carrier concentration, an electrical mobility, and a resistivity values were 2.29× 1018 cm−3, 10.29 cm2 V−1 s−1, 3.16cm, is the most suitable for solar-cell applications.