bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic Response of Rigid Pavement Plate due to Localized Blast Load
Authors: Budi Priono Anjas , Alisjahbana Sofia W. 
Published: December 2020

Abstract
In structural and transportation engineering applications, the dynamic response of orthotropic plates is an essential matter. Engineers did not consider the effects of dynamic loads such as those from machine vibrations or blast load. Dynamic analysis of rigid pavement plates due to local blast loads on concrete slabs in this research is modeled as concrete slabs with boundary condition that every edges of plates have a dowel-tie bar support and The rigid concrete pavement sitting on elastics Pasternak foundation is modeled by using the Kirchhoff theory of thin plates. Pasternak foundation have elastic vertical spring support and continuous shear layer. The main system responses that are observed are the transversal deflections at midspan and the internal stresses of the plate, particularly the maximum principle stress, minimum principle stress and maximum shear stress. Three loading phases are included in the analysis, namely: the positive phase, the negative phase, and the free vibration phase. Analyses are carried out utilizing a numeric approach termed the Modified Bolotin Method with two trancedental equation. The analysis is performed when the load is above the plate (0 ≤ t ≤ t0). Deflections resulting from various load positions on the set of slab models throughout all three phases are then compared side-by-side. Bending moment, shear forces, and stresses are calculated on all slab models with the Friedlander localized blast loading applied at midspan and the results are presented as stress contours that are then compared between each model.
Analysis of Welding Strength S45C Material in Spot Welding Process with Variations in Welding Press Time and Electrode Diameter
Authors: M.Lubis Sobron , Rosehan  , Erlely Styven 
Published: December 2020

Abstract
Spot welding is one system of connecting to steel materials or other materials that make up sheets. The welding time and electrode diameter are the factors that determine the formation of welding nuggets. This study was conducted to analyze the effect of welding time and electrode diameter on the joint strength of the S45C steel plate with a thickness of 1 mm. The welding process takes place with variations in welding time lasting 1 second, 1.5 seconds, 2 seconds, 2.5 seconds, 3 seconds, and variations in the electrode diameter of 6 mm, 8 mm, 10 mm. The results of welding are then carried out a tensile test to determine the strength of the formed nugget. From the data obtained, an analysis is performed. The highest output voltage analysis result of a 6 mm electrode diameter is 0.92 V with a welding time of 1.5 seconds, 8 mm electrode diameter is 0.9 Volt with 2 seconds welding time and a 10 mm electrode diameter is 0.98 Volt with welding time 1 second. The results of the highest electric power analysis of the 6 mm electrode diameter were 9655.12 Watt with 3 seconds welding time, 8 mm electrode diameter was 9227.66 Watt with 3 seconds welding time, and 10 mm electrode diameter was 9260.64 Watt with 3 seconds welding time. The highest tensile stress analysis results were 20.97 N/mm2 at 6 mm electrode diameter, 21.7825 N/mm2 at 8 mm electrode diameter and 29.555 N mm2 at 10 mm electrode diameter
Multiple Linear Regression Analysis On Effect Of Time Variations And Voltage Variations On Spot Welding Against Shear Strength Of Aa5083 Material Using Ibm Spss Application
Authors: Wiranto Gugun , Lubis Sobron Y , Rosehan  
Published: December 2020

AbstractSpot welding is one type of welding that is quite widely used in the vehicle industry, as well as ship manufacturing. This study used AA5083 aluminum plate which has a thickness of 1 mm, and overlapping joint. This study examine the effect of voltage and time variations on the value of the shear strength of the welded joint. The material is cut with a size of 200mm x 40mm, welded with voltage variations of 1.75V, 2.2Vand 2.28V. And time variations between 1s, 1.5s and 2s, 300Nconstant pressure and uses copper electrodes with a diameter of 8mm. Multiple linear regression analysis is carried out and the effect of variabel X1 (stress) + X2 (time) on Y (shear strength) is 50.4%, where X1 is 22.7% and X2 is 27.8%. It states that there is no influence between X1 and X2 on Y, because the more dominant data is the data at 1.75V and 2.2Vvoltages which have no significant difference. At 2.28V the material will receive more heat so as to allow the material to melt and have a greater HAZ area as well as the material thickness decreases so that it will affect the shear strength very significantly.
Model Expert System for Diagnosis of Covid-19 Using Naïve Bayes Classifier
Authors: Silahudin D , Henderi  , Holidin A 
Published: December 2020

Abstract
This paper offers an expert system model for COVID-19 diagnosis as an effort to overcome the spread of COVID-19 in Indonesia. The expert system model was built using the Naive Bayes Classifier method. Model development is carried out with preliminary research stages, data collection, analysis, model design, implementation, and testing. The data used to build and test the model comes from the health department and the acceleration of the Covid- 19 countermeasure group in Indonesia. The model was developed with a unified modeling language and a prototyping approach. Tests show that the developed COVID-19 diagnosis system expert model can diagnose COVID-19 based on the symptoms inputted by the user into the system. The application of the model produced in this study helps assist doctors in diagnosing COVID-19.
Interest and implementation of construction certification law in Indonesia
Authors: Ekasartika Trisna , Lim Jason , Santoso Iwan B. 
Published: December 2020

Abstract
This research aims to improve the development of Indonesia’s construction workforce by analyzing workers knowledge regarding certification law and their implementation in real work, as well as the interests towards certification. The sampling technique used a purposive sampling strategy with research subjects of 100 Indonesian construction workers. Primary data was collected with questionnaire which was further analyzed with Mann-Whitney U test method. From the research, it is obtained that the total percentage of workers knowledge regarding certification law is only 47%. Only 35% of respondents know there is sanction if they are not certified, and 33% are aware of sanctions if they employ uncertified construction workers. Only 34.44% of uncertified workers know of the certification law, while for the certified workers, 62.66% of them know of the law. The implementatian of certification law in real work is 52.68%. Although the number of certified workers are not many, there are high interest of the workers to have certificate which is 70.36%, and in extending certificate which is 77.27%. There is a significant difference between the average interest of uncertified workers and certified workers toward certification. People who have already got certificates are more interested in extending certificate ownership.
Learning the Basic Strcuture of Several Ransomwares Using Static Analysis Tecgnique
Authors: Amiruddin Amiruddin , Kurniawan Candra , Ramadhani Eka Hero , Rinaldi Julio 
Published: December 2020

Abstract
The ransomware can encrypt the files on the victim’s device and then offer a keyword to decrypt them with a ransom of money. Information about the basic structure of ransomware is needed so that an antivirus can detect its presence. To find out the structure of ransomware, static and/or dynamic analysis can be done. In this study, ransomware analysis was performed using static techniques. The choice of static techniques was based on the ease of doing the analysis and also it does not need to run the malware sample being analyzed. The result of the research shows that of the six ransomware samples analyzed, it is known that all of the samples used almost the same structure in the form of imphash, ssdeep, and library and there are even samples come from the same family of ransomware.
Study of selecting floor cover by using the value engineering method in the housing project
Authors: Labuan F L , Waty M 
Published: December 2020

Abstract
Value engineering is an attempt to get the lowest possible cost without eliminating the main functions in a product, process, or service. The way is to identify and overcome the factors that cause costs without contribution or effort. Housing projects have a lot of construction work. Floor work is one of the jobs that has high costs and has the possibility to do value engineering. This project is a housing project, located in the South Tangerang area with 118 units. The goal is to get the best material choices for flooring. Alternative flooring materials in this study are vinyl, carpet, laminate wood, and ceramics. Floor materials in the initial design of the project are granite and ceramics. In the process, this research uses value engineering analysis with a value engineering job plan approach that is assisted by an expert choice program. After analyzing the data using expert choice, the result of urutan ranking criteria is material availability by 30.9%, ease of installation by 22.0%, strength by 18.2%, price by 16.5%, and design by 12.5%. While the alternative weight of vinyl is 26.5%, laminate wood 19.4%, ceramics 32.1%, and carpets 22.0%. The construction cost owned by the initial floor work is IDR 3,105,164,536.61, thus saving the initial design cost of IDR 511,533,875.30. It can be stated that vinyl and ceramics are the best alternatives in this two-story housing project.
Real-Time Information System Basic Needs Price Change Predictions in The Traditional Market
Authors: Mukhlis Qurbany Reza , Trisnawarman Dedi , Sutrisno Tri 
Published: December 2020

Abstract
Currently, the traditional market is a place that is popular in society to buy various basic needs. But unfortunately, until this time information about prices in the traditional market still very minimal, and prediction of the price in later days not available yet, as of this necessary there is a system that can deliver information of basic needs price, and a feature that can be predicting price in later days. In this research method that is used to perform the price prediction is the weighted moving average (WMA), and determine the length of data retrieved is 7 days. As of the calculation accuracy result, the lowest MAPE value is 2,4768% and the maximum is 7,8829%, it can be concluded predictions were made already quite accurate and the price predictions can be informed to the public on every day.
Energy Efficiency Efforts at Dukuh Golf Kemayoran Apartment
Authors: Hasibuan Friska , Lianto Fermanto , Hendra Siwi Samsu , Martinus Bambang S. 
Published: December 2020

Abstract
The existence of apartments today has become a residential choice for people in big cities, including Jakarta. These vertical dwellings usually consist of various types of dwellings and buildings are designed with an area, space pattern, location of furniture, and supporting facilities that are similar in each type. Another thing to note is that most middle and upper-class apartments are equipped with high technology facilities such as private lifts on certain units, wifi, and smart home technology systems, one of which is in the apartment of the Mansion Dukuh Golf Kemayoran Jakarta. Apart from being designed with lighting and ventilation through the openings in each room, the residential units in this apartment also use technology applications in several types of residential units. This study aims to determine energy efficiency efforts at the Kemayoran Golf Hamlet Apartment. The study was prepared using a qualitative descriptive method. The expected benefits of this study are so that apartment dwellers know more and can use technology as much as possible for energy efficiency. From the results of the study note that the layout of the openings and the existence of technology in the Kemayoran Golf Hamlet Apartment is an efficient energy efficiency effort and can create the comfort of its inhabitants.
The Design of Coffee Grinder Machine Knockdown With 8 Levels of Coarseness
Authors: Jusuf Daywin Frans , Gozali Lina , Olyvia Doaly Carla , Salim Adnan , Ibrahim Abdurrafi , Fatima Maria , Inggrid Pingkan 
Published: December 2020

Abstract
The design of Portable and Knockdown Coffee Grinder products with 8 Levels of Coarseness that not only has one function, but also has additional functions applied to the product design. The design based on reverse engineering theory and VDI 2221. The Product design consist of Prototype Design, Grinder House Design, Grinder Design, Top Drawer Design, Small and Large Drawer Design.
Risk identification of Design And Build at school building construction project in central Jakarta
Authors: Suharyanto Andreas , A. Simanjuntak Manlian Ronald 
Published: December 2020

Abstract
Based on the school data from the basic data of primary and secondary education, the Ministry of Education and Culture semester 2019/2020, in the city of Central Jakarta there are 512 school buildings consisting of 245 state schools buildings and 267 private school buildings, which with details as many as 68 Elementary School Building, 24 Junior High School buildings, 11 Senior High School Buildings, 13 Vocational School Buildings and 7 Special School Buildings. Design and build is one of the procurement of construction services work. The concept of design and build has existed from many years ago. At this time it grew and increased its use. Government-owned school building projects now implement design and build systems in the process of implementing their work. This research have a purpose to identify design and build risks on the construction of school buildings in South Jakarta. This research is also aimed at knowing the potential risk or the most dominant of design and build on the construction project of building buildings in central Jakarta. The risk factors gained are used as data to make repairs or precautions in the implementation of construction activities. The method used in this research is a survey method through distributing questionnaires to respondents, namely contractors. Then the result data from the propagation of the questionnaire is processed by using SPSS software to analyze the primary data received. This research Instrument uses 49 risk variables.
Risk Identification in Procurement of Precast Facade on High Rise Buildings in Jakarta
Authors: Sulistianto Ardian , A. Simajuntak Manlian Ronald. 
Published: December 2020

Abstract
This research aims to identify risks in the procurement façade precast phase in buildings in Jakarta. In this research, there are three phases of procurement based on PMBOK that is planning,implementation and management. The problem in this research is to be able to know and identify the cause of the risk of procurement façade precast on high rise buildings in Jakarta and to know the façade precast wall characteristic in buildings. The research object is a building in Jakarta area. The test conducted in this study is validity with Expert Judgement, factor test, regression test and model test with the help of SPSS 23 program. Obtained 38 risk variables based on data collection through the study of the library. Furthermore, the correlation test and intercorrelation are only obtained 12 variables that worth to used. Based on the results of analysis conclusions, of the 3 factors and 38 risk variables that affect project completion performance. The most dominant or significant risk has been obtained: X9 = design planning, X31 = the existence of rework, X16 = location of difficult sites, X14 = transportation and delivery problems.
Bamboo Composite Compressive Strength With Three Layer Configuration
Authors: Djamil Sofyan , Suardana NPG , Irawan Agustinus P. , Sugita IKG , Lubis Sobron Y , T Dicky 
Published: December 2020

Abstract
The use of composite materials in the automotive industry aims to create new material that have advantage of good mechanical properties, environmentally friendly and cheaper. Composite is a combination of two or more materials that have good physical properties and good mechanical properties. Reinforcement materials commonly used in polymer composites are natural bamboo strips can be used as reinforcement materials and matrix used was epoxy resin polymer. The research phase began with the manual cutting of bamboo into bamboo strips using a knife with a thickness of 0.5-0.8 mm and width of 4.0-6.0 mm bamboo strips. Bamboo strips were given 5% alkaline treatment for 72 hours, after alkaline treatment is complete the bamboo strips are washed with clean water flow and dried at room temperature for 48 hours. Reinforcement that is used is plain weave type using bamboo strips. The composite manufacturing process uses the hand lay-up method. The configurations of orientation angle that is used are 0°/0°/0°; 0°/45°/0°; 0°/90°/0°. Compressive test with ASTM D3410/D3410M-16 and observe microstructure using SEM (Scanning Electron Microscope). Composite with configurations of orientation angle of 0°/0°/0° have the highest average impact value of 0.216 J/mm2 and an average compressive strenght of69.740 MPa with average modulus of elasticity of 41.660 GPa. The result of observe using SEM (Scanning Electron Microscope) are given initial signs of specimen damage, delaminate and buckling.
Digital Communication of Chinese Millennial Generation in Building the Creative Economy of Surakarta
Authors: Paramita Sinta , Irena Lydia 
Published: December 2020

Abstract
This study examines the dynamics of Chinese millennial generation in building a creative economy. Today, millennials who understand technology use are a major force in moving the wheels of a nation’s economy, but on the other side, millennials of Chinese ethnicity can be said to be indirectly impacted by the dark history of racial discrimination in the past, which has made them more alienated. Previous research found that Surakarta was one of the cities that experienced riot involving Chinese ethnic discrimination. Even so, the presence of Chinese ethnic in Surakarta has been improving the economy of this city, such as the existence of Pasar Gede that was developed by the Chinese. Seeing this phenomenon, researchers are going to analyze how this Chinese millennial generation who are both the minority and the driving force of the nation’s economy has been utilizing digital communication in ways to build the creative economy in Surakarta. This study is purposed to analyze the digital communication of Chinese millennial generation in building the creative economy in Surakarta. The theories that are applied in this research is the study of digital communication theory and the creative economy. This research uses a quantitative method. The results found that as much as 66.45% of Chinese millennial generation in Surakarta has been building the creative economy and the highest creative industry sector was found in the Video, Film and Photography, and Music industries.
Failure Analyses on Corrosion of Hot Water Tank Storage Made from Stainless Steel
Authors: Tirta Nindhia Tjokorda Gde , Widya Semara I Putu , Bandem Adnyana I Wayan , Surata I Wayan , Komang Dwijana I Gusti 
Published: December 2020

Abstract
Hot water storage tank that was made from stainless still was investigated in this case. The tank was found failure in service due to corrosion in welded section. Corrosion also was found at the bottom part of the storage tank. The tank was used for no longer than one year but unfortunately severe corrosion was found. The purpose of this research is to find the reason why the tank easily corroded especially at the bottom part and at the welding section. The research was carried out by conducting metallographic examination directly in situ by utilizing portable metallographic microscope. It is found from investigation that the corrosion was happen due to galvanic corrosion. Investigation by using X ray fluorescence also agree that the composition of the bottom part of the tank was different with the wall, and upper section. The welding filler also was found not correctly prepared that make pitting corrosion to occur. It is suggested to conduct advance research to investigate the correct composition for the filler during welding.
Development of automatic Landsat data download engine
Authors: Pradono K A , Safitri Y D , Adhitama B S , Hestrio Y F , Soleh M , Gunawan H , Widijatmiko N , Sunarmodo W 
Published: December 2020

Abstract
Remote sensing data usually collected by direct acquisition using ground station. But, limitations on acquisition often leads to missing data (especially the old data). United States Geological Survey (USGS), as one of scientific agency and Landsat remote sensing satellite operator, provides access for users to their old to recent remote sensing data. USGS also provides tools to help user to download their data in large or small quantities, but the tools have limitations. The most noticeable limitations are error when downloading and low download speed. At the same time, access and download data in large quantities without tools would takes a lot of time and effort. Hence, an engine to overcome those limitations needs to be developed. By using this engine, users are expected to be able download remote sensing data in large/small quantities automatically, with higher download speed, and less error or corrupt data.
Web-Based Inventory Information System in Antariksa Stores
Authors: Ariesta Devan , Rusdi Zyad , Sutrisno Tri 
Published: December 2020

Abstract
Antariksa Store is a shop that specializes in electronics and audio. As a seller, the Antariksa Shop must manage inventory items well. Inventory system that runs on the Antariksa Shop, such as recording incoming items, stock, and items out is still running manually, thus causing difficulties in recording items and errors in making reports. Because of these problems, the Antariksa Shop wants to use the information system in the Antariksa Shop to overcome the problems that exist in the Antariksa Shop. Based on these problems, a web-based inventory information system was created to manage existing inventory at the Antariksa Shop. Web- based inventory information system created using the SSAD method and with Waterfall modeling. Data storage uses a MySQL database and the programming languages used to create information systems are html, css, js, and php. Information systems are carried out using the Black Box and User Acceptance Test (UAT) methods. The Web-Based Inventory Information System at the Antariksa Store is expected to help manage incoming items, inventory and outgoing items at the Antariksa Store and make it easier to make reports, and reduce errors in the recording of items.
Forensic Analysis of Instagram on Android
Authors: Alisabeth Carolin , Restu Pramadi Yogha 
Published: December 2020

Abstract
The use of social media has become a new lifestyle trend in today’s society. Social media provides a variety of benefits, ranging from building connections, delivering news, and sharing daily activities. On the other hand, social media is often misused to commit crimes, such as cyberbullying, child grooming, buying and selling drugs, spreading hoaxes, etc. Information uploaded on social media can be made into consideration for investigations in finding evidence of crimes. Therefore, efforts in supporting the verification of crimes in social media need to be done using the right forensic techniques. Topic of this research is an analysis of artifacts produced by the Instagram application on Android. This research provides benefits for analysts and practitioners to help in finding digital evidence of Instagram on Android. The results of this study successfully identified artifacts of Instagram application on Android, such as user account information, message exchange documentation, and user-uploaded activity traces.