싱룽호 서점

MUDA-아키텍츠(MUDA-Architects) 현대건축사 2018 월간 CONCEPT Vol.- No.234

Optimum LWA content in concrete based on k-value and physical-mechanical properties

Muda, Zakaria Che,Shafigh, Payam,Yousuf, Sumra,Mahyuddin, Norhayati Binti,Asadi, Iman Techno-Press 2022 Advances in concrete construction Vol.14 No.3

Thermal comfort and energy conservation are critical issues in the building sector. Energy consumption in the building sector should be reduced whilst enhancing the thermal comfort of occupants. Concrete is the most widely used construction material in buildings. Its thermal conductivity (k-value) has a direct effect on thermal comfort perception. This study aims to find the optimum value of replacing the normal aggregate with lightweight expanded clay aggregate (LECA) under high strengths and low thermal conductivity, density and water absorption. The k-value of the LECA concrete and its physical and mechanical properties have varying correlations. Results indicate that the oven-dry density, compressive strength, splitting tensile strength and k-value of concrete decrease when normal coarse aggregates are replaced with LECA. However, water absorption (initial and final) increases. Thermal conductivity and the physical and mechanical properties have a strong correlation. The statistical optimisation of the experimental data shows that the 39% replacement of normal coarse aggregate by LECA is the optimum value for maximising the compressive and splitting tensile strengths whilst maintaining the k-value, density and water absorption at a minimum.

Hub Location-allocation in Computer-based Networks under Disruption Using Whale Optimization Algorithm

Iskandar MUDA,R. Sivaraman,Sulieman Ibraheem Shelash Al-Hawary,Untung Rahardja,Rusul S. Bader,Deni Kadarsyah,Karrar Shareef Mohsen,Abdullah Hasan Jabbar,Purnima Chaudhary 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.3

In this research, the location of hubs in computer networks is investigated using the whale optimization algorithm. The problem of locating hubs in computer networks is an optimization problem and requires the definition of a suitable fit function. Therefore, the total data transfer time and the cost of creating hubs is used as a fit function. Capacitive hubs increase network availability because hubs have more response capacity than the number of node requests connected to the hubs. In hub location issues, the study seeks to connect the nodes to the nearest hub and create a computer network with the least cost of connecting the nodes to the hubs. The present study attempts to reduce disruptions in computer networks as a research innovation. Therefore, by using the whale optimization algorithm and solving the model with its help, the effective factors that affect computer network disruptions and examining the effect of each are identified. Given the results, the model’s reaction in terms of time and cost led to an increase in temporal and cost parameters.

Characteristics and Genesis of Two Profiles Developed From Amphibolite Complex Rocks in Southwestern Nigeria

Sikiru Muda,Temitope Okusami,Oladipo Omotoso 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

엠50 아트 호텔

무다 아키텍츠(MUDA-Architects) 현대건축사 2019 월간 CONCEPT Vol.- No.244

The Effect of Corporate Taxpayer’s Compliance with Tax Audit: A Case Study in Indonesia

Mukiyidin MUKIYIDIN,Iskandar MUDA,Azizul KHOLIS 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5

The study answers the awareness of taxpayers, tax authority services, tax socialization, tax collection, and account representative’s controlling (monitoring) for compliance of the corporate Taxpayer. The study also examines the moderating effect of the tax audit to control the corporate Taxpayer’s compliance. In this study, the method of non-probability sampling was used. The research data was gathered by handing out questionnaires at the Medan Kota Tax Office in Indonesia. The SEM method was used for data analysis through Lisrel 8.8 program. The findings of the study concluded that tax collection has a significant positive effect on corporate taxpayer’s compliance and Tax audit moderates the relation between tax authority services and the account representative’s controlling (monitoring) with corporate taxpayers’ compliance. Also, tax socialization and account representative’s controlling (monitoring) have a positive effect on the corporate taxpayer’s compliance. In contrast, variables of taxpayer’s awareness and tax authority services have a negative impact. Furthermore, tax audit does not moderate the relation between taxpayer awareness, tax socialization, and tax collection with the corporate taxpayer’s compliance at Medan Kota Tax Office Indonesia. The findings suggest the Indonesian policymakers and tax authorities must create corporate legislation to handle compliance by leveraging the loopholes in tax legislation law and the tax audit system.

Determining the Required Vitamin D Level for Bone Health Based on Bone Turnover Markers

Ismail, Tuan Salwani Tuan,Muda, Bayani Che,Rosdi, Roznie Aida Mohd,Zainuddin, Azalina,Isa, Salbiah,Mustapaha, Zulkarnain Korean Society for Clinical Laboratory Science 2017 대한임상검사과학회지(KJCLS) Vol.49 No.4

To date, no clear threshold that has been established for defining an adequate store of vitamin D for bone health. Therefore, this study aims to determine the required level of vitamin D to maintain a healthy skeleton based on bone remodelling process among healthy adult population. This was a cross sectional study, involving a healthy adult population in Kota Bharu, Malaysia, aged 18~50 years. We measured serum 25(OH)D (vitamin D), serum parathyroid hormone (PTH), serum C-terminal telopeptide of type 1 collagen (CTX), and Procollagen 1 Intact N-Terminal (P1NP) in 120 healthy adults selected via multi stage sampling (64 males, 56 females) from 6 subdistricts in Kota Bharu. The mean level of 25(OH)D was 23.50 (${\pm}8.74$) nmol/L. There was a significant difference of the vitamin D level between genders ($26.81{\pm}8.3nmol/L$ vs $19.72{\pm}7.68nmol/L$ in males and females respectively) (p value<0.001). More than 50% of female subjects had 25(OH)D less than 20 nmol/L, while only 20.3% of male subjects had 25(OH)D below 20 nmol/L. Based on the LOESS plot, the bone turnover markers showed a plateauing result, at the 25(OH)D level of 35 nmol/L for CTX and 20 nmol/L for P1NP. Contrastingly, PTH showed a step rise in the 25(OH)D level of 20 nmol/L. Based on the LOESS plot for CTX, P1NP and PTH versus 25(OH)D, level of vitamin D between 20 to 35 nmol/L is recommended to maintain healthy skeleton.

Factors Affecting the Distribution of Working Capital Credit

Robby Satya ANDHIKA,Iskandar MUDA,Keulana ERWIN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6

Working Capital is an indicator of the short-term financial position of an organization and is also a measure of its overall efficiency. The growth of working capital credit for BPR in North Sumatra is not only influenced by the better performance of ROA, ROE, BOPO, and NPL, but is also influenced by the condition of the debtor’s business, existing economic conditions, and management’s assessment of the health and risk of BPR. The study aims to determine how much influence the CAR, NPL, BOPO, management assessment, ROA, ROE have on the amount of credit to be distributed by BPRs in North Sumatra, Indonesia. The study employed the time series data of published financial statements of 54 rural banks in North Sumatra from 2016 to 2019 and also employed the Chow and Hausman tests, as well as the general effect and fixed effect model specification tests. The results showed that partially the NPL, BOPO, management assessment, and ROE had a significant effect on the amount of credit to be disbursed by BPR in North Sumatra, while the variables CAR, OEOI, and ROA had a negative effect on the amount of credit to be distributed by BPR in North Sumatra. The findings also suggested that banks with a high ratio of NPL, management assessment, and ROE are more aggressive to control the working capital.

Mass transfer kinetics of chemical oxygen demand removed from palm oil mill effluent in stirred cylinder batch reactor

Mustafa Wajdi,Khalida Muda,Mohamad Ali Fulazzaky 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-

Understanding the mechanisms and mass transfer kinetics of chemical oxygen demand (COD) removedfrom palm oil mill effluent (POME) could be one of the most important steps to achieve an effectivedesign process of engineering acetogenic bacteria. The aim of this study was to evaluate the mass transferkinetics of COD removed from POME in stirred cylinder batch reactor (SCBR) under an anaerobic environmentusing the modified mass transfer factor models. The performance of SCBR for the removal of CODincreased with an electromagnetic field (EMF) exposure reaches 77.6% of its maximum efficiency whenthe operation of SCBR was set at the hydraulic retention time of 9 days. The variation of [kLa]d valuehas a trend of almost similar to that of [kLa]g value and is far higher than that of [kLa]f value to concludethat the resistance of mass transfer for the removal of COD from POME by the SCBR process depends onexternal mass transfer. The analysis of COD removal efficiency pursuant to the [kLa]d value provides anew insight on the performance of SCBR increased with an EMF exposure contributing to advanced treatmentof COD from POME for achieving an effective process of engineering acetogenic bacteria.

Studies of Atmospheric PM2.5 and its Inorganic Water Soluble Ions and Trace Elements around Southeast Asia: a Review

Nadhira Dahari,Khalida Muda,Mohd Talib Latif,Norelyza Hussein 한국기상학회 2021 Asia-Pacific Journal of Atmospheric Sciences Vol.57 No.2

Air pollution is a worldwide issue that is mainly caused from excessive inhalation of hazardous PM2.5 pollutant that is emitted into the air. The objective of this study is to assess the fundamental knowledge revolving PM2.5 (particles aerodynamic diameter of lower than or equal to 2.5 μm) and its inorganic composition in ambient air of urban areas, mainly in Malaysia in comparison to other Southeast Asia countries. This research also investigates the theory of particle number concentration (PNC) with PM2.5, also the health effects and origins of the emissions. The factors affecting the PM2.5 mass include the local emission, El Nino phenomenon, land, meteorological effects, monsoons, rainfall events, sea breeze, transboundary pollution and seasonal changes. 24 h mean PM2.5 mass concentration for metropolitan regions in the SEA is in the range of 11 μgm−3 and 72.3 μgm−3, while between 5.30 μgm−3 and 55.89 μgm−3 for semi-urban zones. For rural area, the 24 h mean PM2.5 value is about 30 μgm−3. The findings indicate that metals inPM2.5 emission are frequently Pb, Se, Zn, Cd, As, Bi, Ba, Cu, Rb, V, Ni, Fe, Ca, Mn, Cr, Al, Si and K, where Zn has the uppermost range of 133.50 to 419.30 ngm−3 while the major water-soluble ions exist are NH4 +, K+, Ca2+, Na+, inwhichNa+, NH4 + and Cl- are present in aged sea salt and mixed industrial, Ca2+ and Mg2+ present in mineral dust, NH4 +, K+ and SO4 2− present in mixture of SIA and biomass burning. There is a high correlation between the particle mass concentration and PNC level, especially the ones in accumulation mode (PNC0.1–1.0) which are mostly originated from the emission of heavy traffic streets.