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Syamsul Mujahidin
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Specta Journal of Technology
Published by Institut Teknologi Kalimantan
ISSN : 25492713     EISSN : 26229099     DOI : https://doi.org/10.0610/specta.v2i3
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Environmental Science
SPECTA journal is published by Lembaga Penelitian dan Pengabdian kepada Masyarakat, Institut Teknologi Kalimantan, Balikpapann Indonesia. SPECTA is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in the field of Physics, Mathematics, Mechanical Engineering, Electrical Engineering, Chemical Engineering, Materials and Metallurgy, Civil Engineering, Industrial Engineering, Naval Engineering, Urban Planning, Informatics, Information System, Environmental Engineering, and Ocean Engineering. SPECTA accepts submission from all over the world, especially from Indonesia.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 325 Documents
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Analisis Variasi Temperatur Artificial aging Terhadap Struktur Mikro dan Sifat Mekanik Pada Aluminium 6061 T6 Widyawati, Fauzi; Solahudin, Muhammad Miftah; Hidayat, Syamsul
SPECTA Journal of Technology Vol. 8 No. 1 (2024): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v8i1.1016

Abstract

Aluminum alloy 6061 series has been used extensively in the manufacturing industry. This aluminum material was chosen because it has many advantages. The level of superiority of aluminum can be seen in terms of good machining ability, perfect surface finish, good level of corrosion resistance, and high strength. In this research, the samples used 6061 series aluminum alloy, and an artificial aging process was carried out with temperature variations of 150ᴼC, 175ᴼC, 200ᴼC, and a holding time of 8 hours. Following this, measurements were performed for hardness, impact, and microstructural observations. The research shows that the mechanical properties of the alloy after the artificial aging process tend to decrease as temperature variations increase, for the hardness value obtained at 150ᴼC is 57.34 HRB, 175ᴼC is 55.42 HRB, 200ᴼC is 46.12 HRB. For the impact value, the optimal value was obtained at a temperature of 150ᴼC with a value of 41.4 J/mm2. When the microstructure was examined, it was discovered that each specimen's AlMg2Si compound was the consequence of the artificial aging process.
Penilaian Bisnis dan Prediksi Kebangkrutan Perusahaan: Studi pada Emiten Yang Listing pada Papan Akselerasi Bursa Efek Indonesia Agung Prabowo; Yansyah, Deli
SPECTA Journal of Technology Vol. 7 No. 3 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i3.1022

Abstract

Business valuation is one of the fundamental aspecs that must be done in making investment decisions and to evaluate company performance. The risk of bankruptcy is a risk that always exists in business, so it is important to mitigate. This research try to determine the value of the company using financial ratio analysis, which consists of liquidity, solvency, activity, and profitability ratios. Furthermore, bankruptcy prediction analysis is also carried out to determine the possibility of the company experiencing bankruptcy. we observed two companies in the transportation and logistics sector that are listed on the acceleration board, PT. Prima Globalindo Logistik, Tbk (Ticker Code: PPGL) and PT. Utama Radar Cahaya, Tbk (Ticker Code: RCCC). The results show that two companies have good financial ratios and a low risk of bankruptcy
Analisis Kualitas Website Rumah Sakit Umum Daerah Beriman Balikpapan Menggunakan Metode Webqual 4.0 dan Importance-Performance Analysis (IPA) Natasia, Sri Rahayu; Insanittaqwa, Vika Fitratunanny; Al Hafid, Adil
SPECTA Journal of Technology Vol. 7 No. 3 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i3.1025

Abstract

RSUD Beriman Balikpapan uses a website to introduce its facilities and services. However, there are several problems on the RSUD Beriman Balikpapan website, such as a lack of clarity in interactions and difficulty understanding the website, unclear directions, pages without content, less detailed information, and minimal interaction between users and the organization. Apart from that, an assessment of the quality of the website has never been carried out by the Beriman Balikpapan Regional Hospital. Based on these problems, it is necessary to analyze the quality of RSUD Beriman Balikpapan's website using the Webqual method and IPA (Importance-Performance Analysis) analysis. The assessment aims to increase the problem visibility to the stakeholders to improve the quality of the website. The instruments used in this research come from the Webqual 4.0 method, which includes three main dimensions: usability, information quality, and service interaction quality. The analysis technique applied is Importance-Performance Analysis (IPA), which will provide an overview of indicators that require improvement or need to be maintained based on the difference between perceived performance and user expectations. The results of the Webqual Index (WQI) calculation show an average value of 0.79, indicating that overall, the quality of the RSUD Beriman Balikpapan website is relatively good. Hypothesis testing shows significant differences between perceived performance and user expectations in all dimensions. The gap analysis produces an average gap value of -0.37. From the Importance-Performance Analysis, several indicators need to be considered for improvement. These indicators are related to the ease of navigation and use of the RSUD Beriman Balikpapan website, the provision of always up-to-date information, and services that align with the expectations promised on the RSUD Beriman Balikpapan website
Analisis Peramalan Inflasi Di Kota Balikpapan Menggunakan Metode ARIMA Lembang, Gebryani Rante; Silfiani, Mega; Fitria, Irma
SPECTA Journal of Technology Vol. 7 No. 3 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i3.1026

Abstract

Uncontrolled inflation is one of the problems in a country's economy. This is because inflation is used as a reference for monetary policy. However, controlling the inflation rate is relatively difficult to do. Therefore, an accurate inflation rate forecast is needed so that it can predict future inflation. This research aims to predict future inflation using the ARIMA method. The data used in this research is inflation in Balikpapan City from January 2016 to December 2022. From the analysis results, the best ARIMA method for predicting inflation in Balikpapan City is ARIMA([1,2,12],0,[6]) which has an RMSE value of 0.22886. Further research that can be carried out to improve the accuracy of Balikpapan City inflation forecasting is the use of combined methods or adding independent variables that are able to explain Balikpapan City inflation in the future.
Optimasi Algoritme Xtreme Gradient Boosting (XGBoost) pada Harga Saham PT. United Tractors Tbk. Astutiningsih, Tiyas; Saputro, Dewi Retno Sari; Sutanto
SPECTA Journal of Technology Vol. 7 No. 3 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i3.1031

Abstract

The issue of a recession in 2023 continues to increase, affecting the rise and fall of the stock price index. From 2015 to 2023 the share price of PT. United Tractors Tbk. experiencing fluctuations. The method used to determine fluctuations in PT. United Tractors Tbk. share data is an ensemble learning. One of the ensemble learning algorithms that is popular and often used for prediction or classification problems is Extreme Gradient Boosting (XGBoost). The aim of this research is to obtain the best model ofPT. United Tractors share prices using XGBoost. XGBoost is a development of Gradient Boosting which has the advantage of faster implementation. The data used is the share price of PT. United Tractors Tbk. from March 16 2021 to March 31, 2023. This research uses four technical indicators in analyzing share price movements, namely Exponential Moving Average (EMA), Simple Moving Average (SMA), Relative Strength Index (RSI) and Moving Average Convergence /Divergence (MACD). This experiment produced a MAPE value of 3.89%, which shows the optimization of the XGBoost algorithm on PT share prices. United Tractor Tbk. produces accurate models.
Kontrol Penggunaan Air Bersih Perumda Tirta Manuntung Balikpapan dengan Multivariat Exponentially Weighted Moving Avarage Pratama, Aditya Putra; Angelita, Meisy
SPECTA Journal of Technology Vol. 7 No. 3 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Perumda Tirta Manuntung Balikpapan merupakan perusahaan daerah yang didirikan untuk menjamin pemerataan dan keseimbangan pelayanan air minum untuk kebutuhan masyarakat dan usaha lainnya. Dalam proses distribusi Perumda Tirta Manuntung Balikpapan memerlukan kontrol pengendalian yang akan membantu proses pemerataan distribusi. Dengan mengambil studi kasus pelanggan air minum dikawasan MT. Haryono Balikpapan periode Januari – Desember 2022. Diagram kontrol yang paling optimal untuk data distribusi air minum Perumda Tirta Manuntung Balikpapan adalah multivariat exponentially weighted moving average (MEWMA) karena diagram kontrol ini sangat sensitif terhadap pegeseran kecil rata-rata proses dari suatu variabel yang berdistribusi normal multivariat, sehingga dari diagram kontrol tersebut didapatkan Batas kendali atas (UCL) sebesar 22.8 dan batas kendali bawah (LCL) sebesar 0. Selain itu, data distribusi penggunaan air yang memiliki jumlah out-of-control terendah terjadi pada bulan April dengan jumlah 4 pengamatan yang memiliki nilai Ti 2 out-of-control dan yang memiliki jumlah out-of-control tertinggi dikawasan tersebut terjadi pada bulan September dengan jumlah 94 pengamatan yang memiliki nilai Ti 2 out-of-control
Pola Spasial Kejahatan Pencurian Berdasarkan Aspek Temporal di Kecamatan Kadia: Spatial Pattern of Theft Crime Based on Temporal Aspects in Kadia District Ilham, Muhammad; Wibisono, Bambang Hari
SPECTA Journal of Technology Vol. 7 No. 3 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i3.1033

Abstract

Kecamatan Kadia saat ini masuk ke dalam kecamatan yang rawan terjadi kejahatan di Kota Kendari berdasarkan data dari Polres Kendari tahun 2023. Penelitian ini bertujuan untuk menjelaskan pola spasial kejahatan yang terjadi berdasarkan aspek temporal terjadinya kejahatan sehingga dapat mengetahui karakteristik kejahatan di setiap dimensi waktu di Kecamatan Kadia agar memudahkan pencegahan terhadap kriminalitas serta mengidentifikasi daerah yang rawan terjadi pencurian di Kecamatan Kadia, mengingat keterbatasan personil kepolisian yang tidak memungkinkan untuk melakukan pengawasan di seluruh kawasan di Kecamatan Kadia. Penelitian ini menggunakan pendekatan kuantitatif kualitatif dengan metode analisis berupa Nearest Neighborhod Analysis untuk melihat pola kejahatan pencurian yang terbentuk, selain itu metode Kernel Density juga digunakan untuk melihat kawasan yang rawan terjadi pencurian berdasarkan lokasi kejadian. Dari penelitian ini diketahui bahwa kejahatan di malam hari sampai dini hari memiliki pola kejahatan yang cenderung acak (random) dengan kawasan permukiman penduduk menjadi kawasan yang cenderung rawan terjadi kejahatan pencurian sedangkan kejahatan pencurian pada pagi hari sampai sore hari memiliki kecendrungan pola menyebar (dispersed) dengan kecendrungan terjadi di kawasan komersial dan permukiman penduduk. 
Analisis Preferensi dan Partisipasi Civitas Akademik Institut Teknologi Kalimantan Dalam Pemilahan Sampah Rahendaputri, Chandra Suryani; Endrawati, Budiani F.; Djafar, Alfian; Sutakin, Mariana Ulfah; Gunawan, Arie Indra; Hizbullah, Moh. Naufal; Armida, Gina; Savera, Arum; Dzulfiqa, Muhammad Rizky
SPECTA Journal of Technology Vol. 8 No. 2 (2024): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v8i2.1043

Abstract

Solid waste management problems have become a common problem in Indonesia. Based on data from the Central Bureau of Statistics' Environmental Care Behavior Indicator in 2017, it shows that 58.32% of Indonesians do not sort their waste. Kalimantan Institute of Technology (ITK) is a campus that carries the concept of eco-campus. Waste segregation has been programmed, but in reality in the field, waste segregation is not running. Therefore, this study was conducted with the aim of knowing the preferences and participation of ITK academic community in waste segregation at ITK. The survey results showed that out of 380 respondents, although 90% had seen posters about waste segregation at ITK, only 57.6% stated that they had done waste segregation at ITK, which was mostly based on the factor of facilitating management both by ITK and at the landfill. For the other 44.2% of respondents who do not or only sometimes do waste segregation, it was found that the biggest factor that made them do so was based on the desire to segregate at the beginning, but when opening the trash can, the waste inside was already mixed.
Identifikasi Potensi Radioaktivitas pada Pisang Ambon (Musa Paradisiaca) dan Kulit Pisang Kepok (Musa Acuminata Balbisiana) Untuk Aplikasi Baterai Nuklir rahastama, swastya; Hidayat, Jefri Pandu; Mahera, Adinda Kholif; Amelia, Rani Marizah; Salsabila, Syifa
SPECTA Journal of Technology Vol. 8 No. 2 (2024): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v8i2.1045

Abstract

Banana peel has a high potassium content, including the presence of the radioactive element K-40. As one of the beta emitters, K-40 has the potential to be a natural radioactive material for use as a betavoltaic nuclear battery source. In this study, the levels of K-40 content and radioactivity of kepok banana peel (Musa Acuminata Balbisiana) and ambon banana peel (Musa Paradisiaca), local varieties from the Balikpapan region, will be examined. Banana peel samples are first dried to reduce the water content and then processed into dry powder by heating for 20 hours. The mass and water content before and after the drying process are tested to observe shrinkage and its effects on the level of radioactivity. XRF testing is conducted to determine the potential potassium content of each sample. Radioactivity levels are measured using a Geiger Counter survey meter with sensitivity in the energy range of 50 KeV - 1.5 MeV. From the drying results, a greater decrease in mass is observed in kepok banana peel compared to ambon banana peel, accompanied by a significant reduction in water content. XRF test results indicate that the drying temperature has an effect on the emitted X-ray intensity. The activity content in kepok banana peel samples is found to be higher than in ambon banana peel. An estimated quantity of kepok and ambon banana peels needed to achieve the required 1 mCi activity for the nuclear battery is approximately 1.1 tons and 1.3 tons, respectively.
Prototype Game Education Number Box Toys sebagai Upaya Mengembangkan Keterampilan Kognitif dan Motorik Anak Prakoso, Indro; Ayu Anggraeni Sibarani; Sarah Nurmalawati; Valent Okky Nurcahya
SPECTA Journal of Technology Vol. 8 No. 1 (2024): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v8i1.1080

Abstract

Number Box Toys are children’s toys for children aged 1 to 4 years, designed to help children develop their cognitive and motor skills and learn about different number shapes and colors, including the number 0 to 9. The aim of developing this educational game prototype is to provide a visual image of the product and determine the production cost of the Number Box Toys product which is manufactured using 3D printing machine. Before making a prototype, Number Box Toys product design was created in 2D and 3D using Solidwork software, and then a Bill of Materials (BOM) and Operation Process Chart (OPC) were created. When producing the Number Box Toys prototype, simulation software was used using the Creality Slicer application to show the total time required to produce a Number Box Toys product, which was approximately 1803,78 minutes or 30,063 hours. The total time required to complete the entire operation process chart of Number Box Toys is 1822,78 minutes or about 30,38 hours, with details of 57 operation processes and 18 inspection processes. The results of calculating the production cost of the Number Box Toys educational game based on the total time required, material prices and labor costs resulted in a production cost value of Rp 404.690,89 and the selling price is Rp 465.383,03 with a profit of 15% of the cost price is Rp 60.702,13. There is a significant price difference compared to similar products sold on the market because Number Box Toys’ product prototype is made using 3D printing process, which requires a lot of time to make each part but has a size or shape that can be customized to suit the consumer.

Page 28 of 33 | Total Record : 325

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