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Arman Harahap
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International Journal Of Science, Technology & Management (IJSTM)
Published by CV. Inara
ISSN : -     EISSN : 27224015     DOI : doi.org/10.46729
Core Subject : Science, Education, Agriculture, Engineering,
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
International Journal of Science, Technology & Management (IJSTM) is an international scholarly refereed research journal which aims to promote the theory and practice of science, technology, innovation, engineering and management.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 1,077 Documents
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Analysis of Relation Between Risk-Based Work Breakdown Structure (WBS) on Integrated Design and Construction Works of Design and Build Contract on Mechanical and Electrical Works of High Rise Building for Improving Safety Performance Feronica Damanik, Mariana; Latief, Yusuf; Nugroho, Danang Budi
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.860

Abstract

The construction industry has had the highest accident rate worldwide for decades. Identifying risks as early as feasible during the pre-construction or design phase is essential to preventing construction accidents. To generate a structured list of risks, a Work Breakdown Structure (WBS) is used to identify risks. Although numerous studies have proposed using Work Breakdown Structure (WBS) to identify risks, no one has analyzed the relationship between Work Breakdown Structure (WBS) and risk to reduce construction accidents. Consequently, this study aimed to investigate the impact of Work Breakdown Structure (WBS) risk during the design and construction phases on construction safety performance. The analysis of relationships will be conducted using statistical methodologies. The study's findings will demonstrate that Work Breakdown Structure (WBS) risk affects construction safety performance.
How Digital Payment And Social Media Marketing Affect Purchase Decisions Of Subang Culinary SME Customer, Indonesia Apriandi, Devy; Najmudin, Najmudin; Karnowati, Nandang Bekti; Prakoso, Fajar Adi
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.861

Abstract

This research is an empirical study to see the relationship between the application of digital payment media and digital marketing for small and medium enterprises, especially in the culinary sector in the city of Subang. Why is this research being carried out in Subang, because there are not many small and medium entrepreneurs in the culinary sector in the city of Subang who have implemented digital payments and digital marketing in their businesses. The data in this research uses primary data obtained from 121 questionnaires to culinary business customers who make digital payments and search for information digitally before making a purchase. From the results of data processing, it is known that digital payments have a significant effect on purchasing decisions in small and medium businesses in the culinary sector with a T-count score of 6,357, and marketing using social media also has a significant effect with a T-count value of 6,609, and together digital payments and marketing social media has a significant effect with an F count of 114,804
Analysis Of Solar Power Plant Utilization For Public Street Lighting In Probolinggo, Jawa Timur, Indonesia Saputri, Fahmy Rinanda; Richard Stanlee, Adrix; Hadi Prasetya, Indra; Delana Wijaya, Sarah
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.862

Abstract

Fossil fuels namely coal, petroleum, and natural gas have long been chosen as the main energy sources in meeting global energy needs. However, fossil fuels have the main problem in that their amount is limited and causes global warming. To overcome these problems, renewable energy such as solar energy can be used. Solar energy can be converted into electrical energy by using solar panels. The installation of a solar power plant certainly requires a large budget, to check its feasibility and can be simulated using PVSyst and RETScreen. In particular, PVSyst is used to search for the amount of material needed, the power capacity produced, and energy losses (there is energy lost). Then, RETScreen is used to calculate photovoltaic installation costs, operational and maintenance costs after photovoltaic installation, and emissions. Probolinggo has enormous potential to use solar power plants with Photovoltaic modules. This study simulates the installation of photovoltaic modules in Probolinggo which still has shortcomings in terms of public street lighting. From the simulations carried out, it can be concluded that Probolinggo is feasible for the installation of the solar power plant. With PVSyst, the total number of photovoltaic modules installed is 15,112 pieces. The total power generated is 10,145 MWh. Then, by using RETScreen, a photovoltaic installation fee of Rp142,978,410,000 was obtained. and annual maintenance costs of Rp1,281,870,000.
Development Of Risk-Based Audit Method Standard For Stadium Project Using Design And Build Contract To Minimize Dispute From Construction Management Point Of View Alvian Sutekat, Ega; Putro, Anggoro; Latief, Yusuf
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.863

Abstract

The Design and Build method have been widely used in government projects in recent years. The construction of a sports stadium is one type of project that uses an integrated contract. Design and build, which is considered to have high complexity and is urgent, so the use of the Design and Build method is expected to provide a solution in the implementation of the project. However, in implementing the integrated design and construction contract, there are still many disputes from stakeholders involved such as Inspection of Work Results. This study aims to identify the factors that cause dispute in the Design and Build project and develop a Standard for Inspection of Work Results from the perspective of Construction Management. The results of the study indicate the factors causing the dominant risk-based dispute as well as corrective action in the form of standard inspection of work results on construction projects.
Application Of The Sol-Gel Hydroxhapatite Synthesis Method From Green Clam Shell Edahwati, Luluk; Sutiyono, Sutiyono; Ikaputri, Aninda; Nur Fuadzi, Moh
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.864

Abstract

Hydroxyapatite is the main mineral that makes up bones and teeth so that it has a level of similarity with the mineral parts of bones and can be used as an alternative bone substitute material. As an alternative material for bone substitution, hydroxyapatite has a fairly high economic value and is still dominated by imports from foreign countries. In an effort to reduce the level of imports of hydroxyapatite, research was carried out on green mussel shells as a source of calcium for the synthesis of hydroxyapatite. The synthesis of hydroxyapatite was carried out using the sol-gel method with raw materials for calcium precursors obtained from green mussel shells and varied concentrations of phosphoric acid (0.1 M, 0.5 M, 1 M; 1.5 M; and 2 M). Based on the analysis of the hydroxyapatite product produced using Atomic Absorption Spectrophotometry analysis, it was found that the ratio of Calcium-Phosphate (Ca/P) for H3PO4 concentrations was 0.1 M, 0.5 M, 1 M; 1.5M; and 2 M respectively by 1.73; 1.70; 1.67; 1.63; and 1.61. In addition, based on the results of the Fourier Transform Infra Red analysis, a random sample also found a Ca-O group; PO43; and OH- which is the main group of Hydroxyapatite and from SEM analysis the crystal morphology is known to be spherical, uneven and agglomerated so that in this study the synthesis of Hydroxyapatite using the sol-gel method was successfully carried out..
Islamic Social Reporting (ISR), Sharia Supervisory Board (SSB), and Financial Performance: Empirical Evidence on Islamic Banks in the GCC Region Iskandar, Rizkiana; Marlina, Lilis; Urna Fasihat, Dian
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.865

Abstract

This study aims to determine the relationship between the disclosure of Islamic social reporting (ISR), the Sharia Supervisory Board (SSB), and the financial performance of Islamic banks in the Gulf Cooperation Council (GCC) region. The Islamic banks that were the sample of the study totaled 25 banks spread across Bahrain, Kuwait, Qatar, Saudi Arabia and the United Arab Emirates with a sample period starting from 2013 to 2017. This research uses multiple regression testing and is complemented by content analysis. The results of content analysis show that the average level of ISR disclosure in Islamic banks in the GCC area is 56.53%. That is, the issues of social responsibility have not become a major concern for most Islamic banks. Furthermore, based on the test results, the ISR disclosure level proved to have a positive effect on financial performance. In addition, the existence of SSB in Islamic banks is also proven to have a positive association with financial performance which is proxied by return on average assets. These findings indicate that there are special things in Islamic banking such as disclosure of ISR and SSB that can have a good impact on the financial performance of Islamic banks.
Phytochemical Screening And Antidiabetic Test Of Ethanol Extract Of Turmeric Leaves (Curcuma domestica Val.) On Decreasing Blood Glucose Of Diabetic Rats Br Turnip, Nur Ulina M; Harahap, Urip; Hasibuan, Poppy Anjelisa Z.
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.866

Abstract

The turmeric plant (Curcuma domestica Val.) is a tropical plant that grows a lot on the Asian continent with is use as a food coloring and fragrance. The use of turmeric leaves by residents is only a cooking ingredient not used in large quantities. Even most of these turmeric leaves are considered waste and have minimal utilization. Turmeric leaf methanol extract can be used to lower blood glucose. Turmeric leaf extract has the potential as a valuable food source of its antioxidant components, such as total phenolic compounds and flavonoids which increase radical scavenging activity. In particular, the water extract of turmeric leaves contains high total phenolic compounds (2.741?±?0.099?mg GAE/g) and flavonoids (4.776?±?0.010?mg QCE/g). Diabetes mellitus is a metabolic disorder associated with several chronic complications, such as nephropathy, neuropathy, retinopathy and cardiomyopathy. Part of the turmeric plant leaves is reported to have the ability as an antioxidant. Antioxidant compounds can control blood glucose levels and prevent diabetes complications. This study was conducted to test the ability of turmeric leaf ethanol extract (EEDK) to reduce blood glucose levels in diabetic rats induced by nicotinamide and streptozotocin and to perform phytochemical screening to determine the compounds contained in turmeric leaves so that it becomes an alternative as a diabetes treatment and can prevent damage. or diabetic complications. The results showed that turmeric leaves contained secondary metabolites, namely flavonoids, glycosides, tannins, and triterpenoids/steroids, but there were no alkaloids or saponins. The characterization results show that the sample meets the requirements. Turmeric leaf ethanol extract doses of 400 mg/kg, 200 mg/kg, and 100 mg/kg could reduce the Blood Glucose Level of NA and STZ-induced rats from the fourth day of treatment.
Phytochemical Screening And Test For Reducing Uric Acid Levels In Male Rats After Administration Of Ethanol Extract Of The Herb Binara (Artemisia vulgaris L.) Situmorang, Novidawati Boru; Harahap, Urip; Hasibuan, Poppy Anjelisa Z.
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.868

Abstract

Hyperuricemia is a metabolic disease generally characterized by high uric acid levels in the blood. The general treatment strategy for hyperuricemia is to decrease uric acid production using xanthine oxidation reductase inhibitors such as allopurinol and uricosuric agents. However, the drugs showed side effects, including skin rashes, diarrhoea and liver damage. To overcome the side effects of synthetic drugs, alternatives are used, namely by researching to find plants that have activity in reducing uric acid levels. The activity of reducing uric acid levels in plants is likely due to the presence of flavonoid compounds as antioxidants. Flavonoids active in reducing uric acid levels are kaempferol through xanthine oxidase inhibitors. Quercetin also has the potential to reduce uric acid levels through inhibition of the xanthine oxidase enzyme. Binara plant (Artemisia vulgaris L.) has flavonoids, tannins, alkaloids, glycosides and saponins which have potential as antioxidants and analgesics, anti-inflammatory, immunomodulating, and hepatoprotective, through secondary metabolites of flavonoids, terpenes, and phenolic acids. The Karo people have traditionally used Binara leaves to treat wounds, diarrhoea and heartburn by chewing some of the leaves and then placing them on the wounds outside the body, such as cuts and for diarrhoea and stomach ulcers and placing them around the sick stomach. This study was conducted to know the anti-hyperuricemia effect of the Ethanol Extract of Herba Binara (Artemisia vulgaris L.) on gout rats; phytochemical screening was carried out first to determine the content of Herba Binara (Artemisia vulgaris L.) compounds. The results showed that Herb Binara fulfilled the simplicia characterization requirements and contained secondary metabolites such as alkaloids, flavonoids, tannins, glycosides, saponins and steroids. Herb Binara Ethanol Extract has been shown to reduce uric acid levels in hyperuricemia rats, with the best concentrations being 400 and 800 mg/kg body weight. This was based on significantly different results p>0.05 compared to the positive control group.
Phytochemical Screening And Antidiabetic Test Of Ethanol Extract Of Sapodilla Kecik Leaves (Manilkara kauki (L) Dubard) On Decreasing Blood Glucose Of Diabetic Rats Purba, Novandi; Harahap, Urip; Hasibuan, Poppy Anjelisa Z.
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.869

Abstract

The development of traditional medicine needs to be carried out so that Indonesia's natural wealth can be utilized as effectively as possible to improve people's welfare. As with diabetes, some reputable traditional herbal medicines contain antidiabetic properties. Natural antidiabetic drugs derived from compounds isolated from plants can be used as an alternative to traditional medicine for diabetes because they have potential side effects. Diabetes can be treated alternatively by using various substances, especially those containing polyphenols, such as flavonoids. Sapodilla kecik (Manilkara kauki (L.) Dubard) from the Sapotaceae family is a type of plant used in traditional medicine; leaves, roots and bark can be used to treat diarrhoea in children, seeds can be used as a febrifuge, anthelmintic, and as an antileprotic. Secondary metabolites in sapodilla kecik leaves are flavonoids, alkaloids, tannins, triterpenoids and glycosides. This research was carried out by characterizing and screening phytochemicals to determine the content of compounds in Sapodilla kecik (Manilkara kauki (L.) Dubard) and carrying out antidiabetic tests on streptozotocin-nicotinamide-induced diabetic rats. The results showed that sapodilla kecik leaves fulfilled the simplicia characterization requirements. Sapodilla leaves contain secondary metabolites such as alkaloids, flavonoids, tannins, glycosides, saponins and steroids. The ethanol extract of sapodilla kecik leaves at a dose of 500 mg/Kg BW starting from the 4th day of treatment, a dose of 250 mg/Kg BW starting on the 8th day of treatment, and a dose of 125 mg/Kg BW starting on the 12th day was able to reduce the KGD of induced diabetic rats with nicotinamide and streptozotocin.
Optimization of Trigona Honey and Coating Material Formulations for Antioxidants and Physical Properties of Microencapsulation of Coriander Seed Extract Using the D-Optimal Mixture Method Muttaqin, Irfan; Taufik, Yusman; Ikrawani, Yusep
International Journal of Science, Technology & Management Vol. 4 No. 4 (2023): July 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i4.870

Abstract

The purpose of this study was to produce an optimal formulation of coriander seed extract microencapsulation products using the Mixture D-Optimal Design Expert program.The study consists of two stages. The first stage was the analysis of the coriander seed extract powder using the spray drying method without the use of coating materials and honey. The second stage was to determine the optimal formula using the D-Optimal Mixture method of Design Expert program through measurement of chemical responses (antioxidant activity, and water content), physical response. (particle size). The optimum formula obtained based on the Design Expert program with the D-Optimal Mixture method has a desirability value of 1 with the prediction value of each response being 395.124 ppm antioxidant activity, 2.329 % water content, and 2.967 µm particle size.

Page 59 of 108 | Total Record : 1077

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