bluuebunny/crossref_metadata_2025 huggingface dataset:
Pengembangan Ekowisata Batu Katak Melalui Metode Swot Analisis
Authors: Yuliana Yayuk , Indarjo Slamet
Published: January 2019

Pengembangan ekowisata merupakan salah satu upaya untuk menjaga kelestarian hutan sebagai sumberdaya alam hayati dan mensejahterakan masyarakat di sekitarnya.  Dusun Batu Katak merupakan salah satu dusun yang berada di daerah penyangga  Taman Nasional Gunung Leuser.  Sejak tahun 2013 masyarakat Dusun Batu Katak telah membuka Ekowisata Batu Katak.  Wisatawan  yang berkunjung ke Ekowisata Batu Katak terus mengalami peningkatan. Penelitian yang dilakukan bertujuan untuk mengetahui faktor-faktor dalam pengembangan Ekowisata Batu Katak.  Metode pengumpulan data dengan melakukan studi literatur, observasi lapangan, wawancara dengan masyarakat dan stakeholder.  Analisis data dengan menggunakan analisis SWOT untuk merumuskan alternatif-alternatif strategi.  Hasil penyusunan alternatif-alternatif strategi diketahui terdapat 11 alternatif strategi.  Perencanaan  Ekowisata masih tetap mempertahankan kondisi alami dengan penataan ruang,  sirkulasi ekowisata yang tetap menjamin kenyamanan pengunjung dan penduduk.

Ecotourism development is one of the efforts to preserve the forest as a natural resource and prosper the surrounding community. Batu Katak Village is one of the buffer zone of Gunung Leuser National Park. Since 2013 the Batu Katak community has opened the Batu Katak Ecotourism. Tourists visiting the Batu Katak Ecotourism continue to increase recently. The research was aimed to determine the factors in the development of Ecotourism in Batu Katak. Data was done by collecting the literature studies, field observations, interviews with the community and stakeholders. Data was analyzed using SWOT to formulate alternative strategies. The results of the preparation of alternative strategies had 11 alternative strategies. Ecotourism planning still maintained the natural conditions with spatial planning, ecotourism circulation which still guarantees the comfort of visitors and residents.
Tahanan Penetrasi Tanah Terhadap Penekanan Plat Dengan Sudut Penekanan dan Ukuran Plat yang Berbeda di Sawah
Authors: Rizaldi Taufik , Sumono Sumono
Published: January 2019

Penelitian dilakukan di Desa Lubuk Bayas Kecapamatan Perbaungan Kabupaten Serdang Bedagai pada lahan sawah bertekstur lempung berpasir dengan kadar air 49.17% dan dry bulk density 1.26 g/cm3. Tahanan penetrasi tanah ditentukan melalui pengukuran tahanan penetrasi plat dengan menggunakan penetrometer secara langsung di sawah. Pengukuran dilakukan dengan ukuran plat 5x5 cm2, 5x10 cm2, 5x15 cm2 dan 5x20 cm2. Sudut penekanan 90o, 75o, 60o, 45o, 30o dan kedalaman penekanan 4 cm, 8 cm, 12 cm, 16 cm dan 20 cm. Dari hasil pengukuran diperoleh bahwa semakin besar ukuran plat maka gaya penekanan semakin besar namun tahanan penetrasi tanah semakin kecil. Sedangkan semakin dalam plat masuk ke tanah maka tahanan penetrasi tanah semakin besar. Semakin besar sudut penekanan tahanan penetrasi tanah semakin besar. Untuk ukuran plat, sudut tekan dan kedalaman penekanan plat yang sama pada kedalaman lumpur yang berbeda akan menghasilkan gaya penekanan dan tahanan penetrasi tanah yang berbeda.

The study was conducted in Lubuk Bayas Village, Perbaungan Subdistrict, Serdang Bedagai District, in paddy fields with sandy clay texture with a water content of 49.17% and dry bulk density of 1.26 g / cm3. Soil penetration resistance iwas determined by measuring plate penetration resistance using a penetrometer directly in the rice field. Measurements were made with a plate size of 5x5 cm2, 5x10 cm2, 5x15 cm2 and 5x20 cm2. The angle of emphasis was 90o, 75o, 60o, 45o, 30o and the depth of emphasis was 4 cm, 8 cm, 12 cm, 16 cm and 20 cm. Results showed that the larger the plate size found, the greater the compressive force, but the penetration resistance of the soil got smaller. Whereas the deeper the plate entered the ground, the greater the penetration resistance of the soil occurred. The greater the angle of suppression the greater the penetration penetration of the soil. For the plate size, the pressure angle and depth of the same plate compression at different mud depths will result in a different force of suppression and soil penetration resistance.
Optimasi Pengering Pakaian Sistem Pompa Kalor dengan Penambahan Alat Penukar Kalor
Authors: Nasution Dian Morfi , Ambarita Himsar , Napitupulu Farel H.
Published: January 2019

Tingginya kesibukan masyarakat saat ini memacu banyaknya usaha laundry yang menawarkan jasa pencucian dan pengeringan pakaian dengan waktu yang singkat. Dalam hal ini sangat dibutuhkan sistem pengeringan pakaian yang efisien dari segi waktu dan energi serta tidak bergantung kepada cuaca. Penelitian ini bertujuan melakukan optimasi pengering pakaian sistem pompa kalor dengan menambahkan sebuah alat penukar kalor tipe plat datar untuk mendapatkan karakteristik pengeringan pakaian dan kinerja mesin pengering. Alat penukar kalor plat datar ditempatkan di antara ruang pengering dan evaporator. Pengeringan dilakukan terhadap 4 jenis bahan pakaian yang berbeda pada setiap variasi kecepatan udara. Diperoleh temperatur udara pada ruang pengering 48,24⁰C dengan kelembaban 24,6%. Laju pengeringan tertinggi diperoleh pada pengeringan 4 bahan pakaian secara bersamaan yaitu 0,3529 kg/jam yang menghasilkan nilai SMER sebesar 1,4537 kg/kWh dan SEC sebesar 0,6879 kWh/kg. Total prestasi pengering diperoleh 6,40 dengan efektivitas penukar kalor 62,24%. Semakin tinggi jumlah kadar air dengan waktu pengeringan yang singkat akan meningkatkan laju pengeringan. Laju pengeringan yang tinggi dengan konsumsi energi yang rendah akan menghasilkan nilai SMER yang tinggi dan menghasilkan nilai SEC yang rendah.

 

The high level of public activity is currently spurring the many laundry businesses that offer laundry and drying services in a short time. In this case, it needs efficient drying system in time and energy and not depending on weather. This study aims to optimize the heat pump system in drying clothes by adding a flat plate type heat exchanger to obtain the drying characteristic of clothes and the performance of the drying machine. Flat plate heat exchanger was placed between the drying chamber and the evaporator. The drying process was carried out in 4 different types of clothing material in each variation of air velocity. Air temperature was obtained in drying chamber of 48.24 ⁰C with a humidity of 24.6%. The highest drying rate was obtained from drying 4 clothing materials simultaneously, namely 0.3529 kg/hour which resulted in an SMER value of 1.4537 kg/kWh and SEC of 0.6879 kWh/kg. The total dryer performance was obtained at 6.40 with the effectiveness of heat exchanger 62.24%. The higher the amount of water in short drying time would increase the drying rate. A high drying rate with low energy consumption would result in a high SMER value and produce a low SEC value.
Analisa Titik Operasi Optimum Pompa Slurry pada Bucket Wheel Dredger dengan Variasi Sudut Gali 30°, 35° dan 40°
Authors: Christian Robby , Sitepu Tekad
Published: January 2019

PT.Timah (Persero) Tbk. merupakan perusahaan tambang timah dengan cadangan terbesar di dunia yang menggunakan kapal isap tipe Bucket Wheel Dredger sebagai salah satu metode penambangan lepas pantai. Untuk mendistribuskan material tambang dari dasar laut menuju unit penyaringan, digunakan air sebagai media pembawa dibantu dengan pompa melalui jaringan pemipaan. Pada proses pengerukan, ternyata didapat masih ada material logam timah yang tertinggal di dasar lautan. Hal ini menyebabkan pengerukan menjadi kurang maksimal. Oleh karena itu, diperlukan analisa untuk mencari kondisi operasi optimum untuk setiap kedalaman penggalian. Dalam penelitian ini, dilakukan perhitungan head secara teoritis dimana prosedur dimulai dengan pengumpulan data pendukung, kemudian melakukan perhitungan untuk mendapatkan hasil. Dalam kondisi lapangan, didapat perubahan luas penampang pipa dikarenakan erosi. Untuk menghitung head, digunakan persamaan Bernoulli, untuk kerugian head major dan head minor digunakan persamaan Darcy-Weisbach dimana kapasitas aliran adalah tetap 7747.2 m3/h dengan variasi sudut gali 30°,35°, dan 40° pada luas penampang dengan pemakaian baru, 1 bulan, 2 bulan, dan 3 bulan. Didapat titik operasi optimum pompa slurry untuk setiap sudut secara berurutan adalah pada 517.08 rpm, 517.44 rpm, 520.96 rpm untuk pemakaian baru; 517.44 rpm, 517.44 rpm, 521.664 rpm untuk pemakaian satu bulan ; 517.44 rpm, 517.792 rpm, 520.96 rpm untuk pemakaian dua bulan; 511.808 rpm, 512.16 rpm, 513.92 rpm untuk tiga bulan.

 

PT. Timah (Persero) Tbk. is the largest tin mining company in the world which uses suction ships of Bucket Wheel Dredger as one of the offshore mining methods. Water is used as a carrier medium to distribute mining materials from seafloor to the filtration unit by pumps through piping networks. During the dredging process, it is found there is still tin metal material left on the ocean floor. This causes dredging process is less optimal. Based on the condition, it needed an analysis to find optimum operating process for each excavation depth. In this research, theoretical head calculations were carried out where the procedure began with supporting data collection, then calculated it to get results. In field conditions, changes in pipe cross section were obtained due to erosion. The Bernoulli equation was used to calculate head, Darcy-Weisbach equation was used for the loss of major and minor head where the flow capacity was fixed at 7747.2 m3/h with digging angle variations of 30 °, 35 °, and 40 ° in the cross-sectional area for new, 1 month, 2 months and 3 months usage. The optimum operating point of the slurry pump for each angles were obtained at 517.08 rpm, 517.44 rpm, 520.96 rpm for new usage; 517.44 rpm, 517.44 rpm, 521,664 rpm for one month usage; 517.44 rpm, 517,792 rpm, 520.96 rpm for two months usage; and 511,808 rpm, 512.16 rpm, 513.92 rpm for three months usage.
Simulasi dan Eksperimental Perbedaan Kebisingan pada Transmisi Sebelum dan Setelah Perbaikan pada Tahap Transmisi 3 dan 4
Authors: Huywen Nordick , Willy Willy , Sabri M.
Published: January 2019

Gearbox merupakan mesin yang berfungsi untuk mentransmisikan tenaga dari motor yang berputar, kemudian disesuaikan dengan roda gigi dilanjutkan menjadi kecepatan gerak putaran bervariasi untuk dapat mengatur maju atau mundurnya mesin. Kajian ini akan menjelaskan perbedaan kebisingan transmisi tahap 3, 4 sebelum dan sesudah perbaikan. Peneliti terdahulu mendapati bahwa perbedaan ragam frekuensi dan ukuran elemen berbeda pada gearbox akan sangat mempengaruhi kebisingan. Pada kajian ini analisa dilakukan terhadap gearbox pada transmisi tahap 3 dan 4 dengan jarak tertentu yang dilingkupi nilai batas 1 lingkaran (-x , x, dan z). Analisis akustik dilakukan pada putaran yang sama untuk melihat perbedaan kebisingan pada gearbox tersebut sedangkan pengukuran dengan sound level meter dilakukan dengan 3 arah yaitu –x, x, dan z. Didapati bahwa kebisingan tertinggi terjadi terhadap transmisi tahap 4 sebelum perbaikan yaitu sebesar 53,19 dB pada simulasi dan 66,1 dB pada eksperimen. Perbedaan hasil kebisingan terjadi dikarenakan pada simulasi adalah single noise dan total noise pada eksperimen.

 

Gearbox is a machine functioned to transmit power from a rotating motor, then adjusting it to gears to become a variable rotational speed to be able to arrange forward or reverse engine. This study explained the noise differences transmission in stage 3, 4 before and after repairing. Previous researchers found that differences in frequency and size of different elements in gearbox would affect noise. In this study, the analysis was conducted on the gearboxes in transmission stages 3 and 4 with a certain distance covered by a boundary value of 1 circle (-x, x, and z). Acoustic analysis was carried out in the same rotation to see the noise difference in gearbox while the sound level meter measurement was done in 3 directions, namely -x, x, and z. It was found that the highest noise occurred in the transmission stage 4 before repairing, i.e. 53.19 dB in the simulation and 66.1 dB in the experiment. The difference of noise occured because the simulation used single noise and the experiment used total noise.
Pengaruh Faktor Pengembangan Wilayah Terhadap Perubahan Guna Lahan di Deli Serdang
Authors: Lindarto H Dwi , Sirojuzilam Sirojuzilam , Badaruddin Badaruddin , Aulia Dwira Nirfalini
Published: January 2019

Dinamika pengembangan wilayah kota menimbulkan permintaan supply lahan bermukim seiring meluasnya wilayah pembangunan kota ke arah pinggiran kota.Salah satu wilayah bertetangga hinterland kota Medan dengan Kabupaten Deli Serdang adalah kawasan Tembung di Kecamatan Percut Sei Tuan yang menunjukkan gejala peri-urbanisasi menjadi kawasan cepat tumbuh desa-kota.Secara spatial arsitektural perubahan struktur kependudukan kawasan Tembung menunjukkan meluasnya pertumbuhan lahan terbangun permukiman yang menimbulkan masalah terbentuknya pola guna lahan (land use) terbangun secara acak (sprawl).Kajian ini mengungkapkan faktor-faktor daya tarik kawasan yang berpengaruh serentak terhadap terbentuknya pola guna lahan terbangun di kawasan Tembungmeliputi aspek topografi, aksesibilitas, infrastruktur, sosial-ekonomi, potensi imaji lokal.Dengan metode kuantitatif deskriptif dilakukan analisis atas data persepsi para pemukim di wilayah terbangun cepat tumbuh. Analisis deskriptif dan regresiSEM menunjukkan keseluruhan faktorberpengaruh terhadap perubahan guna lahandengan rincian hanya pada faktor aksesibilitas (P=0,039), infrastruktur (P=0,005), sosio ekonomi (P=0,038), potensi imaji lokal (P=0,007) yang signifikan berperan menjadi daya tarik kuat bagi perubahan guna lahan terbangun. Implikasi temuan perlunya pengawasan dan pengendalian pemanfaatan ruang terbangun di wilayah berdaya tarik kuat guna mengarahkan kecenderungan dampak negatif urban sprawl development.

 

The dynamics of urban development lead to the demand for land supply along with the expansion of urban development areas towards the suburb of the cities. One neighboring area of ​​Medan City, the hinterland in Deli Serdang Regency is Tembung, located in Percut Sei Tuan Subdistrict.It shows symptoms of peri-urbanization which becomes village-city fast growth area. In architectural spatial, the changes in population structure of Tembung shows the widespread growth of settlement land built that caused problems in the formation of land use (sprawl). This study revealed regional attraction factors which had simultaneous effect on the formation of land use built patterns in Tembung area including topographic aspects, accessibility, infrastructure, socio-economic, local image potential. An analysis was condected by using quantitative descriptive method on the data of resident perceptions in rapidly growing built up area. Descriptive analysis and SEM regression showed all factors affected the change in land use with details only on accessibility factors (P = 0.039), infrastructure (P = 0.005), socio-economic (P = 0.038), local image potency (P = 0.007) which significantly attracted the changes in land use built. This study showed implications of the need for monitoring and controling land use built in regions of strong attraction area to control negative impacts of urban sprawl development.
Rancangan Penghitung Benih Ikan Portable Berbasis Arduino
Authors: Yutanto Jefry , Sinulingga Emerson P. , Fahmi F.
Published: January 2019

Pembenihan ikan merupakan usaha yang dapat dilakukan untuk membantu membudidayakan ikan, pembenihan dan penjualan benih ikan juga merupakan sektor ekonomi yang menjanjikan, namun proses penghitungan ikan masih dilakukan secara manual sehingga penghitungan membutuhkan waktu yang lama dan kurang efisien. Tulisan ini membahas mengenai prototipe alat penghitung benih ikan berbasis arduino yang dapat melakukan penghitungan lebih cepat.Alat penghitung benih ikandibuat dengan menggunakan inframerah, dioda foto, arduino UNO dan LCD 2x16. Inframerah dan dioda foto dipasang berhadapan satu sama lain pada selang. Proses penghitungan terjadi saat ada bahan yang melewati selang dan hasilnya akan ditampilkan pada layar LCD. Pengujian dilakukan dengan mimis, agar – agar, dan ikan gobi dengan menggunakan dua corong berbeda. Hasil perhitungan yang di perolehuntuk mimis dan agar – agar mencapai 100%, dan untuk ikan gobi mencapai 96%.

 

Fish hatchery is an effort that can be done to help cultivate fish hatchery and sale of fish seeds is also a promising economic sector, but the process of counting fish is still done manually so the calculation takes a long time and is less efficient. This paper discusses the prototype of an Arduino-based fish seed counter that can do calculations faster. The seed counting tool is made using infrared, photo diodes, 2x UNO arduino and LCD. Infrared and photo diodes are installed facing each other on the hose. The calculation process occurs when there is material passing through the hose and the results will be displayed on the LCD screen. Tests are done with pellet, jelly, and gobi fish using two different funnels. The calculation results obtained for nosebleeds and agar-agar reached 100%, and for gobi fish reached 96%.
Penerapan Metode Fuzzy Analytical Hierarchy Process dan SLP dalam Rangka Perancangan Ulang Tataletak Fasilitas Produksi Bata Ringan di Pt. PQR
Authors: Tarigan Ukurta , Sitorus Erwin , Veronica Veronica
Published: January 2019

PT. PQR merupakan perusahaan yang bergerak dalam produksi bata ringan. Bata ringan diproduksi menggunakan sistem Autoclaved Aerated Concrete (AAC). Dari hasil pengamatan di perusahaan, produk bata ringan sering mengalami kerusakaan karena jatuh dari pallet saat dipindahkan menggunakan hand lift. Hal ini disebabkan oleh jauhnya jarak perpindahan antara lantai produksi dan gudang produk, sehingga operator kesulitan dalam proses pemindahan. Tujuan dari penelitian ini adalah untuk merancang ulang tata letak fasilitas dengan menggunakan pendekatan metode Fuzzy Analytical Hierarchy Process (Fuzzy AHP) disertai dengan metode Systematic Layout Planning (SLP) untuk mendapatkan rancangan yang efisien. Hasil pembobotan matriks berpasangan menunjukkan tenaga kerja adalah variabel yang memiliki bobot kriteria tertinggi sebesar 0,2735. Setelah dilakukan analisis didapatkan bahwa kedekatan antar departemen sangat dipengaruhi oleh perpindahan tenaga kerja (operator) antar departemen. Dari hasil analisis, dirancang activity relationship chart (ARC) untuk mendapatkan kedekatan antar departemen, kemudian dirancang layout baru berdasarkan pertimbangan luas masing-masing departemen. Hasil rancangan ini dibandingkan dengan rancangan awal, sehingga diperoleh pengurangan jarak sebesar 165,01 m.

PT. PQR is a company engaged in the production of lightweight bricks. Lightweight bricks are produced by using the Autoclaved Aerated Concrete (AAC) system. From the observations in the company obtained results thatight brick products often experience damage due to falling from the pallet when moved using a hand lift. This is due to the distance between the production floor and the product warehouse, so operators have difficulty in the process of moving. The purpose of this study was to redesign the layout of the facility using the Fuzzy Analytical Hierarchy Process (Fuzzy AHP) with the Systematic Layout Planning (SLP) method to obtain an efficient design. The paired matrix weighting results showed that labor is a variable that has the highest weight of 0.2735. After an analysis was conducted, it was found that the closeness between departments was strongly influenced by the movement of labor (operator) between departments. The results of analysis, a relationship chart (ARC) activity was designed to get closeness between departments, then a new layout was designed based on the broad consideration of each department. Furthermore, the results of this design were compared with the initial design, such that obtained a distance reduction of 165.01m .
Kajian Numerik Penguapan Pada Evaporator Desalinasi Air Laut Sistem Vakum Alami
Authors: Ambarita Himsar
Published: January 2019

Fokus penelitian ini adalah alat desalinasi air laut energi surya dengan sistem vakum alami. Salah satu bagian terpenting yang menentukan performansi alat ini adalah proses penguapan pada kondisi vakum di dalam evaporator. Para peneliti umumnya menggunakan cara analitik dengan persamaan-persamaan empirik untuk menentukan laju penguapan pada evaporator.Padapenelitian ini diusulkan menggunakan metode numerik dengan menggunakan perangkat lunak CFD untuk menjelaskan proses penguapan pada evaporator. Hasil numerik dan analitik akan dibandingkan dengan hasil eksperimen. Peralatan eksperimen sederhana telah dirancang bangun untuk mendapatkan hasil eksperimen dan melakukan validasi. Hasil simulasi menunjukkan metode numerik dengan menggunakan perangkat lunak CFD dapat menggambarkan proses penguapan pada evaporator dengan baik. Perbandingan hasil analitik dan numerik menunjukkan laju penguapan di evaporator dengan metode numerik lebih dekat dengan hasil eksperimen. Metode numerik sebaiknya digunakan untuk melakukan inovasi agar dihasilkan peningkatan performansi desalinasi surya sistem vakum alami.

 

The focus of this research is solar energy seawater desalination with a natural vacuum system. One of the most important parts that determine the performance of this tool is the evaporation process under vacuum inside the evaporator. Researchers generally use analytical methods with empirical equations to determine the evaporation rate of the evaporator. This research proposed by using  a numerical method with CFD software to explain the evaporation process on evaporator. Numerical and analytical results will be compared with the experimental results. A simple experimental tool has been designed to get experimental results and validate. The simulation results show that the numerical method using CFD software can properly describe the evaporation process in the evaporator. Comparison of analytic and numerical results shows the evaporation rate in the evaporator with numerical methods closer to the experimental results. Numerical methods must be used to innovate so that the performance of solar desalination results increases by using a natural vacuum system.
Analisa Struktur Speed Bump Paduan Bahan Concrete Foam dan Polymeric Foam Dengan Variasi Rongga Menggunakan Sofware Ansys 14.5
Authors: Hastrino Dino , Muttaqin Maraghi , Syam Bustami , WS Basuki , Sabri M. , Abda S.
Published: January 2019

Speed bump adalah bagian jalan yang ditinggikan menggunakan tambahan aspal, karet, atau semen yang dipasang melintang di jalan untuk memperlambat laju/kecepatan kendaraan. Dalam riset ini, pertama sekali dijelaskan tentang desain serta pembuatan speed bump dengan geometri struktur padat dari bahan concrete foam yang diperkuat dengan serattan dan kosong kelapa sawit (TKKS). Speed bump dirancang dengan ukuran panjang 400 mm, lebar 200 mm dan tinggi 150 mm, memenuhi KM Menhub nomor 3 tahun 1994. Ada dua model speed bump, yaitu bentuk padat dan berongga. Selanjutnya kedua model dianalisis kekuatan strukturnya menggunakan program Ansys APDL 14.5. Pada model padat, jika gaya yang diberikan sebesar 80.000 N tegangan maximum yang terjadi pada bagian kritis struktur sebesar 8.01MPa. Dari hasil uji tekan diperoleh bahwa kekuatan tekan material confoam (type A5) adalah 2,1MPa; sedangkan kekuatan tarik menggunakan Brazilian test sebesar 0,18 MPa. Bila dibandingkan dengan kekuatan tarik maksimum material confoam dapat disimpulkan bahwa struktur tidak aman untuk digunakan untuk beban maksimum (kenderaan truk), sesuai kelas jalan golongan IIIC.Untuk, itu perlu dilakukan redesign struktur speed bump. Struktur yang aman akan digunakan sebagai penggerak free-energy generator.

Speed ​​bumps are elevated parts of the road using additional asphalt, rubber, or cement that are installed across the road to slow down the vehicle's speed. Firstly the research explained about the design and manufacture of speed bumps with the solid structure geometry of concrete foam materials strengthened with the fiber of oil palm empty bunches. Speed ​​bump was designed with a length of 400 mm, a width of 200 mm and a height of 150 mm, in accordance with KM Minister of Transportation number 3 of 1994. There are two speed bump models, namely solid and hollow. Then, the two models are analyzed for structural strength using the Ansys APDL 14.5 program. If the force applied is 80,000 N on solid model, the maximum voltage that occurs in the critical part of the structure is 8.01MPa. Pressure test showed that the strength pressure of the confoam material (type A5) was 2.1 MPa; while the tensile strength using the Brazilian test is 0.18 MPa. If it is compared with the maximum tensile strength of confoam material, it can be concluded that the unsafe structure is used for maximum loads (truck vehicles), according to the IIIC road class. Therefore, it is necessary to redesign the speed bump structure. A safe structure will be used to drive a free-energy generator.
Rancang Bangun Sistim Mekanik Speedbump untuk Menghasilkan Dayalistrik sebagai Tenaga Pembuka Gerbang Pintu Tol Kota Medan
Authors: Taher Tarmizi , Sebayang Alexander , Syam Bustami
Published: January 2019

Speed bump adalah mekanisme yang dipasang pada jalan untuk mengurangi laju kendaraan dengan tujuan keamanan. Pada penelitian ini dikembangkan sebuah speed bump yang memiliki fungsi ganda, yaitu mengurangi laju kendaraan dan sebagai pembangkit daya. Sistem pembangkit daya terdiri dari pasangan roda gigi, poros, roda gila, pegas, rantai dan kumparan generator. Prototipe kemudian diuji pada tingkat kecepatan yang bervariasi. Besar voltase dan arus yang dibangkitkan diukur. Hasil pengujian menunjukkan untuk massa pengendara 400 kg dan variasi kecepatan kendaraan 5 km/jam, 10 km/jam, dan 15 km/jam, dihasilkan tegangan 18 Voltase dan menghasilkan arus sebesar 0.27 ampere. Hasil yang dicapai ini masih kecil, sehingga mendorong peneliti memperbaiki desain stasiun listrik speed bump generasi ke-2.

Speed bump is a mechanism that is installed on the road to reduce the speed of the vehicle with safety objectives. In this study a speed bump that has a dual function was developed, namely reducing the speed of the vehicle and as a power plant. The power generation system consists of pairs of gears, shafts, flywheels, springs, chains and generator coils. The prototype is then tested at varying speed levels. The voltage and current generated are measured. The test results show for the mass of the driver 400 kg and variations in vehicle speed 5 km / h, 10 km / h, and 15 km / h, voltage 18 voltage is generated and produces a current of 0.27 amperes. The results achieved are still small, prompting researchers to improve the design of the 2nd generation speed bump electric station.
Konsentrasi Co2 Pada Ruang Kelas Dengan Sistem Ventilasi Alami, Tipe Jendela Gantung Atas
Authors: Talarosha Basaria , Rosardy Valencia
Published: January 2019

Proses pernafasan menghasilkan udara yang mengandung 4,4% volume CO2 sehingga konsentrasi CO2 di dalam ruang kelas dapat menjadi lebih tinggi dari ruang luar jika ventilasi tidak mencukupi. Konsentrasi CO2 > 1000 ppm akan mengganggu kesehatan dan konsentrasi belajar yang berdampak pada penurunan performa belajar siswa. Penelitian sebelumnya menunjukkan adanya hubungan antara konsentrasi CO2 di dalam ruang kelas dengan ukuran, jumlah, posisi dan tipe jendela pada ruang kelas yang menggunakan sistem ventilasi alami. Tipe jendela gantung atas disebutkan memiliki performa yang paling buruk dalam menetralkan konsentrasi CO2 di dalam ruang. Studi bermaksud mengukur kadar konsentrasi CO2 di dalam sebuah ruang kelas pada salah satu sekolah dasar negeri di kota Medan yang menggunakan tipe jendela gantung atas. Pengukuran konsentrasi CO2 dilakukan pada kondisi sudut bukaan jendela sisi koridor ruang kelas 10 dan 30 masing -masing selama tiga (3) hari. Hasil studi menunjukkan konsentrasi CO2 maksimum pada kondisi sudut bukaan jendela 10 lebih rendah dari pada kondisi sudut bukaan jendela 30LI, namun konsentrasi CO2 rata-rata pada kedua posisi jendela masih di bawah ambang batas konsentrasi CO2 yang diijinkan untuk kesehatan (<1000 ppm).

 

The breathing process produces air containing 4.4% of the volume of CO2 so that the concentration of CO2 in the classroom can be higher than the outside space if there is insufficient ventilation. CO2 concentration> 1000 ppm will interfere with the health and concentration of learning which has an impact on decreasing student learning performance. Previous research has shown a correlation between CO2 concentrations in classrooms with the size, number, position and type of windows in classrooms that use natural ventilation systems. The upper hanging window type is said to have the worst performance in neutralizing CO2 concentrations in space. The study intends to measure the level of CO2 concentration in a classroom in one of the public elementary schools in the city of Medan that uses a type of upper hanging window. Measurements of CO2 concentrations were carried out at the corridor opening angle of the class 10 and 30 for three (3) days, respectively. The results showed that the maximum CO2 concentration at the window opening angle 10 was lower than the 30LI window opening, but the average CO2 concentration in both window positions was still below the threshold of the permissible CO2 concentration for health (<1000 ppm).
Effect of Temperature on the Combustion of Kepok Banana (Musa Paradisiaca Linn cv. 'Saba') Peel as Potassium Source
Authors: Trisakti Bambang , Haryuwibawa Dasa , Pratama Joko Mulya , Irvan Irvan
Published: January 2019

The aims of this study is to determine the optimum combustion temperature of kepok banana (Musa Paradisiaca Linn cv. 'Saba') peel as a potassium source. Experiment was started by combustion kepok banana peel to ashes. Combustion was carried out by inserting 15 g of kepok banana peel into a muffle furnace at temperatures of 450, 500, 550 and 600oC for 3 and 5 hours. The content of potassium in the ash was extracted with pure water which ash-water ratio was 1:100 and the soaking time was 24 hours. Furthermore, analysis of the extract was carried based on various parameter such as normality, pH, electrical conductivity, and potassium content (as K2O). The best of potassium content obtained from ashes produced by combustion of kepok banana peel was 61.80% at temperatures of 550oC for 5 hours of combustion time.
The Use Of Seismic Energy And Damage Index For Assesment Seismic Performance Of Building Under Seismic Excitation
Authors: Teruna Daniel Rumbi
Published: January 2019

Seismic input energy is transmitted into building consists of the kinetic energy, elastic strain energy, damping energy, and hysteretic energy. The amount of the input energy induced by earthquake transmitted into a building depends on earthquake characteristics and building dynamic properties. In this context, the hysteretic energy directly associated with damage to structural members through a parameter which known as the damage index were introduced. For this purposes, influence of earthquake characteristic on energy spectra for SDOF system were described and presented. In addition, influence of structural dynamic properties are also described and discussed. Next, to assess the damage potential to a building under seismic excitation, four story steel moment resisting frame were investigated under three selected ground motion records matching to the response spectra design the new Indonesian code. Furthermore, nonlinear dynamic time history analysis were performed using ABAQUS to obtain responses parameters in term of base shear, drift, input and hysteretic energy. Finally, the seismic performance of the building based on Park and Ang damage index model is presented and summarized.
Pengembangan Kawasan Industri Madura
Authors: Hidayat Rachmad
Published: January 2019

Rencana kawasan industri dikarenakan faktor keberadaan Jembatan Suramadu. Percepatan pertumbuhan daerah dilandasi oleh aspek permintaan pasar dan kawasan industri tersebut serta faktor ketersediaan lahan (tersedianya cukup lahan kosong yang sesuai dengan persyaratan tehnik, persyaratan lingkungan dan persyaratan ekonomis). Pemerintah dan pengembang segera melengkapi lokasi tersebut dengan infrastruktur dan suprastruktur pendukung kawasan industri. Melakukan upaya-upaya promosi yang intensif untuk menarik para calon investor agar mau berinvestasi/menanamkan modalnya di kawasan industri. Mempersiapkan sebuah system dan sarana pelayanan kepada calon investor secara professional, mudah, dan sederhana dalam system pelayanan satu atap, proses pelayanan pajak yang cepat. Kegiatan sejumlah industri yang beroperasi masih belum banyak sehingga pengaruh terhadap transformasi lahan masih rendah. Demikian juga aktivitas industri masih sedikit mempengaruhi transformasi tenaga kerja, karena tenaga kerja yang beralih dari pertanian tidak hanya disebabkan oleh kegiatan industri.

 

Industrial estates are designed due to the existence of the Suramadu Bridge. Acceleration of regional growth is based on aspects of market demand and industrial estates as well as land availability factors (the availability of sufficient vacant land is in accordance with technical requirements, environmental requirements and economic requirements). The government and developers immediately complement this location with infrastructure and superstructure supporting industrial zones. Conduct intensive promotional efforts to attract potential investors to invest / invest in industrial estates. Prepare a system and means of service to prospective investors in a professional, easy and simple way in a one-stop service system, a fast tax service process. There are still not many activities in a number of industries that operate, so the influence on land transformation is still low. Likewise, industrial activity still has little influence on the transformation of the workforce, because labor migrants from agriculture are not only caused by industrial activities.
Perancangan Jadwal Perawatan Mesin Menggunakan Pendekatan Reliability Centered Maintenance (RCM) pada PT. XYZ
Authors: Sembiring Nurhayati , Elvira Gita Ade
Published: January 2019

PT. XYZ adalah suatu perusahaan yang bergerak dalam bidang usaha perkebunan dan pengolahan hasil perkebunan.Produk utamanya adalah Minyak Sawit (CPO) dan Inti Sawit (Kernel). Apabila terjadi kerusakan mesin pada saat jam kerja mesin, maka proses produksi tidak berjalan. Untuk itu diperlukan sistem perawatan yang terjadwal. Tujuan dari penelitian ini adalah mengidentifikasi sumber utama kerusakan mesin, menganalisis kerusakan komponen kritis mesin dengan metode Reliability Centered Maintenance dan membuat jadwal perawatan mesin yang terencana. Komponen kritis pada mesin Screw Press yang dianalisaadalah Gearbox, Hydraulic Double Cone dan Van Belt. Hasil penelitian menunjukan selang waktu penggantian komponen Gearbox adalah 94 hari, komponen Hydraulic Double Cone adalah 105 hari dan komponen Van Belt adalah 116 hari.

 

PT. XYZ is a company engaged in the business of plantation and processing of plantation products. Its main products are crude palm oil (CPO) and palm kernel (kernel). If an engine failure occured during engine working hours, the production process does not work. For this reason, a scheduled maintenance system is needed. The purpose of this study is to identify the main source of engine failure, analyze the failure of critical engine components by using the Reliability Centered Maintenance method and making an engine maintenance schedule. The critical components on Screw Press engine which was analyzed were Gearbox, Hydraulic Double Cone and Van Belt. The results showed the replacement interval for Gearbox component was 94 days, Hydraulic Double Cone component was 105 days, and Van Belt component was 116 days.
Analisa Kegagalan pada Sistem Rem Daihatsu Taft Hiline dengan Menggunakan Metode FMEA (Failure Mode and Effect Analysis)
Authors: Sabri Muhammad , Putra Muhammad Ramadhansyah
Published: January 2019

Sistem rem merupakan komponen penting dalam setiap kendaraan otomotif yang merupakan sebuah sistem keamanan dalam berkendara bertujuan untuk mengurangi dan menghentikan laju kendaraan dengan cara mengatur laju kendaraan sehingga kendaraan dapat dikemudikan dengan aman. Kegagalan dalam sistem rem memiliki dampak yang sangat fatal bagi pengendara maupun pengguna jalan lain. Oleh Metode yang digunakan menggunakan proses FMEA (Failure Mode and Effect Analysis) untuk menentukan penyebab kegagalan yang terjadi. Tujuan dari penelitian ini untuk menganalisa dan mengidentifikasi kegagalan pada sistem rem.Hasil analisa menggunakan metode FMEA didapat penyebab kegagalan terhadap kegagalan pada komponen sistem rem. Dengan diketahuinya penyebab kegagalan maka dapat dilakukan analisa penilaian terhadap komponen pada sistem rem. Kesimpulan dari penelitian ini adalah kegagalan utama yang terjadi pada sistem rem dapat diakibatkan oleh kondisi fluida rem yang buruk sehingga mempengaruhi kinerja dari tiap – tiap komponen rem.

The brake system is an important component in every automotive vehicles. It is a safety driving system aimed to reduce and stop the vehicle by controlling the speed so that the vehicle could be driven safely. Failure in the brake system has a very fatal impact to motorists and other road users. FMEA (Failure Mode and Effect Analysis) Method was using to determine the causes of the failure. The purpose of this study is to analyze and identify failures in braking system. The analysis which was using the FMEA method found the causes of failure of the brake system components. By identifying the causes of failure, the components of the brake system can be analyzed. The conclusion of this study is that the main failure occured in brake system could be caused by poor brake fluid that affects the performance of each brake component.
Payment System Liquidity Index
Authors: Himsar Himsar
Published: January 2019

ISSP is an index that demonstrates payment system’s stability figuring its liquidity (ISLSP) and its operational capability (IOSP). It was formed using two methods, which are statistical normalization and conversion using empirical normalization Min-Max. Basically, this paper intends to evaluate towards variables used in forming ISLSP and basically as a tool to ensure data sensitivity to important events stated. To get ISLSP that is sensitive to RTGS liquidity condition, we use coefficient from each weighted variable through simultaneous regression. We get parameters simbolized , and that are used as weight for each variable. Based on observation to these weighted variables, liquidity variables contribute 60%, PUAB contribute 30%, and interconnectedness contribute 10% in forming ISLSP.
Efficiency of Local Government Units in North Western Philippines as to the Attainment of the Millennium Development Goals
Authors: Baldemor Milagros
Published: January 2019

This study entitled “Efficiency of Local Government Units in Northwestern Philippines as to the Attainment of the Millennium Development Goals” determined the performance of the four provinces and eight cities in Region I, Philippines, vis-à-vis their efficiency along the eight goals and 21 targets of the Millennium Development Goals (MDGs) for 2012-2015. Furthermore, it determined the peer groups and weights of the DMUs (Decision Making Units – the different provinces and cities), the virtual inputs/outputs or potential improvements of the DMUs to be in the efficient frontier, the input and output slacks (input excesses and output shortfalls) needed in the different indicators and the best practices to be considered by the inefficient and weak efficient DMUs. The “best practice” in the frontier is the basis to calculate the adjustments necessary for the DMUs. Different indicators showed varied performance levels in the different years but there are best practices from the “efficient” DMUs which could be adapted by the “weak efficient” and “inefficient” ones.
On Factoring The RSA Modulus Using Tabu Search
Authors: Candra Ade , Budiman Mohammad Andri , Rachmawati Dian
Published: January 2019

It is intuitively clear that the security of RSA cryptosystem depends on the hardness of factoring a very large integer into its two prime factors. Numerous studies about integer factorization in the field of number theory have been carried out, and as a result, lots of exact factorization algorithms, such as Fermat’s factorization algorithm, quadratic sieve method, and Pollard’s rho algorithm have been found. The factorization problem is in the class of NP (non-deterministic polynomial time). Tabu search is a metaheuristic in the field of artificial intelligence which is often used to solve NP and NP-hard problems; the result of this method is expected to be close-to-optimal (suboptimal). This study aims to factorize the RSA modulus into its two prime factors using tabu search by conducting experiments in Python programming language and to compare its time performance with an exact factorization algorithm, i.e. Pollard’s algorithm. The primality test is done with Lehmann’s algorithm.
Implementation and comparison of Berry-Ravindran and Zhu- Takaoka exact string matching algorithms in Indonesian-Batak Toba dictionary
Authors: Budiman Mohammad Andri , Timanta Jos , Siburian Efelin
Published: January 2019

Indonesia has a variety of local languages, which is the Batak Toba language. This time, there are still some Batak Toba people who do not know speak Batak Toba language fluently. Nowadays, desktop based dictionary is one of reference that very efficiently used to learn a language and also to increase vocabulary. In making the dictionary application, string matching can be implemented for word-searching process. String matching have some algorithm, which is Berry – Ravindran algorithm and Zhu-Takaoka algorithm and will be implemented on the dictionary application. Zhu-Takaoka algorithm and Berry – Ravindran algorithm have two phases, which are the preprocessing phase and the searching phase. Preprocessing phase is a process to make the shifting values according to in pattern that input by user. To know the shifting value with Zhu-Takaoka algorithm, it’s need Zhu-Takaoka Bad Character (Ztbc) and Boyer-Moore Good Suffix (Bmgs). Then, Ztbc will be compared to Bmgs to get the maximum value of them that will be set as shifting value. While Berry-Ravindran algorithm, to know the shifting value is needed Berry-Ravindran Bad Character, which the two characters right of the text at the position m + 1 and m+ 2, is needed to determine the shifting value, where m is length of the pattern.
Improving Data Collection on Article Clustering by Using Distributed Focused Crawler
Authors: Gunawan Dani , Amalia Amalia , Najwan Atras
Published: January 2019

Collecting or harvesting data from the Internet is often done by using web crawler. General web crawler is developed to be more focus on certain topic. The type of this web crawler called focused crawler. To improve the datacollection performance, creating focused crawler is not enough as the focused crawler makes efficient usage of network bandwidth and storage capacity. This research proposes a distributed focused crawler in order to improve the web crawler performance which also efficient in network bandwidth and storage capacity. This distributed focused crawler implements crawling scheduling, site ordering to determine URL queue, and focused crawler by using Naïve Bayes. This research also tests the web crawling performance by conducting multithreaded, then observe the CPU and memory utilization. The conclusion is the web crawling performance will be decrease when too many threads are used. As the consequences, the CPU and memory utilization will be very high, meanwhile performance of the distributed focused crawler will be low.
A Framework to Ensure Data Integrity and Safety
Authors: Paulus Erick , Fauzan Mochamad Azmi
Published: January 2019

The technology development allows people to more easily communicate and convey information. The current communication media can facilitate its users to send and receive digital data, such as text, sound or digital image. But in terms of security, communications media not always ensure the confidentiality and authentication of data traffic. Most people rely solely on the security provided by the communications media providers in securing their data, which is essentially still inadequate. This paper presents the development of a data security framework by applying the principles of cryptography and digital signatures, such as authenticity, integrity, and data confidentiality. The application is designed using the SHA-256 algorithm as digital signature, AES algorithm as file encryption, and RSA algorithm as asymmetric key in digital file distribution and signature. Then, several simulation testing was performed to ensure the robustness of the framework. Furthermore, we also evaluated the speed of framework based on CPU and memory capacity. Based on the experiment, our proposed framework can be a reliable solution for securing data in data transaction
Using random search and brute force algorithm in factoring the RSA modulus
Authors: Budiman Mohammad Andri , Rachmawati Dian
Published: January 2019

Abstract. The security of the RSA cryptosystem is directly proportional to the size of its modulus, n. The modulus n is a multiplication of two very large prime numbers, notated as p and q. Since modulus n is public, a cryptanalyst can use factorization algorithms such as Euler’s and Pollard’s algorithms to derive the private keys, p and q. Brute force is an algorithm that searches a solution to a problem by generating all the possible candidate solutions and testing those candidates one by one in order to get the most relevant solution. Random search is a numerical optimization algorithm that starts its search by generating one candidate solution randomly and iteratively compares it with other random candidate solution in order to get the most suitable solution. This work aims to compare the performance of brute force algorithm and random search in factoring the RSA modulus into its two prime factors by experimental means in Python programming language. The primality test is done by Fermat algorithm and the sieve of Eratosthenes.
Time Series And Data Envelopment Analysis On The Performance Efficiency Of Dmmmsu-South La Union Campus
Authors: Baldemor Milagros
Published: January 2019

This study entitled “Time Series and Data Envelopment Analysis (DEA) on the Performance Efficiency of DMMMSU-South La Union Campus” determined the performance of the Don Mariano Marcos Memorial State University -South La Union Campus, La Union, Philippines, a Level Four state university in the country, vis-à-vis its efficiency along the following performance indicators: Program Requirements, Research, Extension and Production for five (5) academic years 2009-2014. Furthermore, it determined the peer groups and weights of the DMUs (Decision Making Units – the different Colleges and Institutes), the virtual inputs/outputs or potential improvements of the colleges/institutes to be in the efficient frontier, the input and output slacks (input excesses and output shortfalls)needed in the different indicators and the best practices to be considered by the inefficient and weak efficient DMUs.The “best practice” in the frontier is the basis to calculate the adjustments necessary for the DMUs. Different indicators showed varied performance levels in the different academic years but there are best practices from the “efficient” DMUs which could be adapted by the “weak efficient” and “inefficient” ones.
Data Analysis as a Method to gather Data to study the Relation between Fundamental Rights and Rule of Law
Authors: MUNTJEWERFF ANTOINETTE , VAN LOO KIRSTEN
Published: January 2019

The research described here involves the relation between fundamental rights and the rule of law. In the end we want to find out what meaning is attributed to ‘rule of law’ by the European Court of Human Rights. In this article we describe our method to gather the data we need to be able to perform an analysis of the reasoning process by the Court.