bluuebunny/crossref_metadata_2025 huggingface dataset:
Face Anti-Spoofing Method with Blinking Eye and HSV Texture Analysis
Authors: Hadiprakoso Raden Budiarto
Published: December 2020

A face recognition system should recognize faces and detect spoofing attempts with printed face or digital displays. A straightforward method of spoofing prevention is to analyze life signs such as eye blinking. However, this method is vulnerable when dealing with video-based replay attacks. For this reason, this paper proposes a combined method of blink detection with HSV (Hue, Saturation, Value) texture analysis. The anti-spoofing method is designed with two modules, the blinking eye module that evaluates eye openness points and the HSV texture module, which evaluates the texture of the color space from the input media. The test data is taken from the NUAA Photograph Imposter database. The results show that the designed model successfully recognizes 100% spoof-attack without exception.
Flow investigation of cross-flow turbine using CFD method
Authors: Aditya Sardjono Joshua , Darmawan Steven , Tanujaya Harto
Published: December 2020

Cross-flow turbine is one of prime mover type that is simple, capable to extract water power and easy to be manufactured. The runner is working at 2 stages. The need of high momentum has lead researchers to design water nozzle, blades, as well as the set-up between nozzle and runner. High momentum water nozzle and cross-flow runner has been designed individually with the same design criteria. Unfortunately, experimental testing may not gain specific flow pattern inside the nozzle and the runner. The purpose of this study is to investigate the flow pattern inside the nozzle, runner using CFD method, Ansys 2019 R3 academic version. The CFD simulation done 3-dimensionally with 5 nozzle inlet velocity variations: 2 m/s, 3 m/s, 4 m/s, 5 m/s and 6,487 m/s. The fluid is assumed to be 1 phase, using mesh with 17.750 nodes, inlet fluid pressure 1,05 Pa, and temperature 24,85°C. The results showed that the lowest velocity and pressure for variation 1 at 1st stage (v1) = 6,65 m/s and (p1) = -11931,5 Pa, and the highest velocity and pressure at 1st stage (v5) = 21,72 m/s and (p5) = -127521 Pa. At 2nd stage, variation 1 and 5 resulting velocity (v1) = 1,78 m/s and (p1) 593,264 Pa, (v5) = 5,83 m/s and (p5) = 6360,32 Pa respectively. The main different of the flow pattern between 5 inlet velocity variations is the final flow thickness inside the runner get thicker at higher velocity, which is assumed to gain more rotational velocity.
Exploration of the Security of Free Data Encryption Applications for Cloud Storage
Authors: Hero Ramadhani Eka , Kabetta Herman , Amiruddin Amiruddin
Published: December 2020

Cloud storage has become an urgent need in the digital age, especially for companies with high level of work collaboration and mobile workers. To prevent data in cloud storage from being accessed illegally, the data must first be encrypted before being uploaded. However, encrypting data separately with cloud data storage media is considered to be less efficient and less secure. To that end, several data encryption applications designed specifically for cloud storage appeared in the market. However, which application is suitable for your requirement, needs to be further investigated. For this premise, in this research, an exploratory study of the security of several free applications of data encryption called Boxcryptor, Cryptomator, and nCrypted Cloud was conducted based on security parameters defined in ISO/IEC 25010. The results showed that two of five security parameters, integrity, and authenticity, are not satisfied by all the applications being reviewed, but Cryptomator outperformed the other two applications.
Critical buckling load analysis on spherical shells under various geometric imperfections
Authors: Darmawan Liliek , Tedianto Leo S
Published: December 2020

The strength of shell structures is mainly determined by their ability to resist buckling. However, the presence of geometric imperfections – a condition which the geometry is no longer the same as the original condition – significantly deteriorates the critical load and often leads to catastrophic failure. Ratio between the actual critical buckling load to the theoretical prediction is called knockdown factor. The study aims to analyse the critical buckling load on spherical dome elastic shells under various geometric imperfections. This study was conducted into several thicknesses (10, 16, 20, 37, 50 mm) and fixed base radius of 4000 mm. Analyses of linear buckling and nonlinear static are performed and aided with finite element program using MIDAS FEA. The result of this study reveals that the critical buckling load decreases sharply in the beginning of imperfection, then reach for quite slow progression until a constant value of Kd = 0.1. In addition, the higher minimum knockdown factor is obtained as the shell thickness increases.
Optimalization Injection Moulding Parameter Process Using General Factorial Design in Small Medium Enterprise Industries
Authors: Laricha Salomon Lithrone , Kosasih Wilson , Ricko
Published: December 2020

Small and medium scale industries that are newly developed have many obstacles due to their ability and experience compared to other large industries. Plastic bowls for collecting rubber latex is one of the products that made from the injection moulding process. The company wants to improve its competitiveness by reducing raw materials used along with considering the quality of the products produced, but due to lack of information, this process is carried out trial & error. This study aims to determine the combination of parameters that can minimize the net weight of the product but still meet the product strength standards, the method used in this study is general factorial design because this method can investigate the effect of each factor and its interactions as additional information. In the analysis of variance (Anova), the temperature barrel in this study is a factor that has a contribution of 88.41% and 90.66% for the net weight and tensile strength of the product. The optimum conditions for this product are A3B1C1D1 by using the regression equation, the net weight of product is 17.3gr with product tensile strength 938,285N.
Automation systems in automatic assembling gear shaft output as car gearbox part at PT. Matahari Megah
Authors: Raynaldo Kevin , Darmawan Steven , Halim Agus , Nugroho Asih
Published: December 2020

This study is an observation and analysis about automatic assembling gear shaft output as car gearbox part that made at PT. Matahari Megah as a result of research. That automation product can reduce the assembly time from about 5 minutes to less than 45 seconds. Then the objectives in this case study are to describe assembly processes, how to choose censoring systems properly, and give recommendation in calculating compressive force for servo press mechanism. Automatic assembling gear shaft output has four main assembly stations consists of station OP 10, OP 20, OP 30, and OP 40. One of the most important element at that product is censoring system mounted at station check for checking the workpiece properly. The recommendations given are about the acrylic plate mounted at station check to reduce the amount of photoelectric sensor and equation for calculating compressive force for pressing gear and bearing to the output shaft appropriately.
Quality Control on Bucket Production Process Using Quality Tools Method (Case Study: A Medium Sized Company)
Authors: Handriany Avriana , Kosasih Wilson
Published: December 2020

This study aims to identify and solve the root causes of the defective products in the injection production line in a company that produces bucket and pipe-related products made from plastic ores. In order to maintain the quality of their products, this company has to figure out what to do in order to pay attention more in their actions to minimize the defects occurred from the production process. Good quality products are also very important to maintain the good relation with their customers. The samples for this research are taken directly from the field and analyzed using the quality tools method which are control chart and pareto diagram, also an addition method of the five-whys analysis to figure out the root causes. Based on the research results, the defective products that occurred in the production process are still in control but still needs to be improved right away. Another result also shows that the root causes are categorized to four groups varies from man, machine, method, and material. Therefore, there are two ways to overcome this problem: preventive and repressive action. The results of this study can be used as a reference in the future for a quality control applied in various companies.
Deep Excavation in Very Soft Soil Using Cross Wall as Lateral Support
Authors: Widjaja Oktaffian , Anwar Makarim Chaidir
Published: December 2020

Deep excavation in areas with very soft clay deposits need a good soil retaining system. Using diapraghm wall as soil retaining system for deep excavation is a good choice. Diapraghm wall is expected to limit the movement that occurs in the walls and avoid leaks that may occur in retaining system, this is needed to minimize damage to adjacent buildings. The top down excavation method by utilizing the basement floor as lateral resistance can be carried out to reduce the movement that occurs on the ground. In very soft soil areas with excavation distances to neighbors very close, the movement on the ground must be limited to minimize damage to adjacent buildings. Cross walls can be used to reduce the movement that occurs on the ground. Analysis finite element using the 2D Plaxis program was carried out to investigate the performance of the retaining wall. From the results of the analysis conducted shows that using a cross wall at a location below the raft pile can reduce the movement that occurs in the retaining wall and the excavation stage can be reduced. The results of this study can be used as a reference in the development of solution lateral support of soil retaining system in deep exaction especially needed in very soft soil condition.
Classification of Fertilizer Using OpenCV Based on Color Characteristic
Authors: Shannich Charlie Jovahn , Wulandari Meirista , Nurwijayanti
Published: December 2020

The agricultural industry is one of the most important sectors for a country because its supports food production. One of the agricultural industries that can increase food productivity is the fertilizer industry. Fertilizers have many varieties. The variant of a fertilizer can be identified by its color. There are 3 types of fertilizers such as NPK fertilizer, Calcium fertilizer and Potassium fertilizer. These fertilizers have different colors. NPK fertilizer has blue color, Calcium fertilizer has yellow color and Potassium fertilizer has red color. Red, Green, Blue (RGB) color spaces and Hue, Saturation, Value (HSV) color spaces are used as extraction of color features on fertilizers which used as fertilizer color features. The color characteristic of the fertilizer is used to classify fertilizer. This paper aims to classify fertilizer based on its color. Fertilizers that have been successfully classified are displayed on the monitor screen. There are 75 fertilizer samples which consists of 3 types of fertilizers and 25 samples for each type of fertilizer used in this paper. Test results show that fertilizer can successfully identified 3 types of fertilizer based on its color. The value accuracy is obtained 100% in the RGB color with the range of RGB color are (40,60,70) to (120,160,170) for NPK fertilizer, (140,120,20) to (210,210,100) for Calcium fertilizer and (20,50,0) to (150,180.20) for Potassium fertilizer.
Effects of opening dimension in shear wall on the behavior of high-rise building structure due to earthquake load
Authors: Rohman Fathur , Leman Sunarjo
Published: December 2020

The aim of this study is to analyze the effects of opening dimension in shear wall on the behavior of high-rise building structure due to earthquake load. The 20-story building prototype with shear wall placement as core wall with various sizes of opening are analyzed with the help of software MIDAS GEN, using equivalent lateral force and response spectrum method in X and Y direction. The shape of opening is square with width vary from 0.8 m – 1.3 m and height set at 2.2 m. This analysis will discuss structure’s natural time period, core wall distribution between shear wall and frame, lateral deflection, and story drift. The results show that the greater the opening will increase the natural time period by 1.72% and 1.67%, increase lateral deflection by 21.7932% and 23.5964%, and increase story drift by 24.6910% and 29.077% in each direction.
Dynamic Response of Rigid Pavement Plate due to Localized Blast Load
Authors: Budi Priono Anjas , Alisjahbana Sofia W.
Published: December 2020

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

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

Spot 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Proposed Improvement Product of Cake Pan Using The Six Sigma Method Approach (Case Study of PT. X)
Authors: Wayan Sukania I , Jusuf Daywin Frans , Wijaya Alvindo
Published: December 2020

PT. X is a manufacturing company that produces several cookware including Cake Pan. The total number of defects in Cake Pan for 3 months increased by a percentage of 0.384% of the total production of Cake Pan. The purpose of this study using the Six Sigma method is to identify and analyze proposals that can be given to control product quality in order to reduce defective products through the Six Sigma approach. This study found that the capability and sigma value of company performance in improving product quality amounted to 930.68 DPMO with a sigma value of 4.6. Based on the cause and effect diagram FMEA known causes of product defects are color defects, spiral defects, dent defects and hollow defects. Based on the results of the calculation of the RPN to determine the most critical and urgent focus priorities to be addressed, namely the quality of raw materials is not good to be the highest RPN value of 288 with a high severity level of 8. The proposals that can be given are in the form of worker SOPs and checking tables in the form of a system 5s. This research is expected to be useful for companies in providing input as well as an overview in the form of information to PT. X in giving more attention to product quality with several supporting factors that affect the quality of the product.
Web based food combination system for diabetes mellitus type 2 with genetic algorithm
Authors: Kuwito Kevin , Arisandi Desi , Jaya Perdana Novario
Published: December 2020

As the age of a person makes it easily infected with a disease such as diabetes. In this case, the food of people suffering from the disease must eat foods that are in accordance with the nutrients needed to reduce the patient’s blood sugar levels. Based on this problem, this study aims to develop a food combination system to help diabetics manage food according to patient criteria. This system requires criteria for producing food combinations and using genetic algorithm methods to produce the best alternative food combinations for diabetics. The combination of food resulted is taken based on the efficiency of chromosomes from genetic algorithms. The genetic algorithm accuracy calculation method reaches 100% by comparison with manual calculations from 5 test cases that have been made. From these results it can be concluded that the application of genetic algorithm methods is sufficient to assist diabetics in making food combinations that fit the patient’s criteria.
Effectiveness of adding organic waste on expansive soil using handheld penetrometer and free swell test
Authors: Sofian A C , Prihatiningsih A
Published: December 2020

Soil is the most important component in construction field, because soil supports construction buildings. The problem is, almost 65% soil in Indonesia is expansive soil that has large swelling and shrinking potential. This problem made worse by the tropical climate. Expansive soils easily shrink in dry season and swell in rainy season. Not only those problems, waste is also major problem in Indonesia. In order to prevent these two problems, a research was conducted by using organic waste as expansive soil stabilization material. Organic wastes that use in this research includes sugarcane bagasse, used tea leaves, rice husk ash, eggshell, and palm fiber. These five organic wastes will be combined with South Jakarta, Cikupa, Bekasi 1, Cikarang, and Bekasi 2 soil sample. All of these samples will be tested with penetrometer and free swell test. Based on the results, organic waste that most affected the increase of qu up to 69.56% and decrease of FSI up to 80.00% of South Jakarta, Bekasi 1, and Bekasi 2 samples is rice husk ash. Whereas organic waste that most affected the increase of qu up to 98.67% and decrease of FSI up to 53.41% of Cikupa and Cikarang samples is Sugarcane bagasse.
Android arcade game “City Protector” with Touch Gesture Recognizer
Authors: Danawan Andrean , Pragantha Jeanny , Andana Haris Darius
Published: December 2020

City Protector is an Arcade Tower Defense Game with endless element. This game implements touch gesture recognizer feature. This game is developed with Unity game engine and playable in Android-based smartphone. To kill zombies, players must draw the symbols contained in the explosives that brought by zombies. Testing is done by blackbox testing, alpha testing, and beta testing through a survey of 32 respondents. The results indicate that City Protector has interesting features and gameplay concepts. It is provides new experiences because the Touch Gesture Recognizer feature is rarely found in general.
Android Musical Puzzle Game “Music Puzzle”
Authors: Filbert Ewaldo , Pragantha Jeanny , Andana Haris Darius
Published: December 2020

“Music Puzzle” is a musical puzzle game for Android. Player will try to arrange the puzzle piece by listening to the music in each puzzle and correct the order of the music. This game use classical music as the theme of the game. This game is developed by Unity game engine with C# as the programming language. Testing has been done with Black Box Testing, Alpha Testing by lecturer and Beta Testing by survey to 30 respondents. The results show that the “Music Puzzle” is an interesting game to play and encourage respondents to interest in classical music.
Android Arcade-Style Racing Game “CarsTime” With Antigravitation Theme
Authors: Michael  , Pragantha Jeanny , Andana Haris Darius
Published: December 2020

CarsTime is an arcade-style racing game with antigravitation theme. This game is made using Unity3D game engine with C# programming language. This game is an Android game. In this game, player will race against bots on track that is not bound by gravity so each car can move even on upside down track. There are three cars that can be used by players, namely C.car, Sonic and Magnum. There are three stages that player can choose to play, namely Map Aspal which doesn’t have any additional difficulties, Map Pasir which makes player’s car move slower and Map Salju which makes player’s car slippery. There are three items that player can collect or interact while racing, namely coin which player can collect for buying car, boost can which player can collect to fill boost meter which can be used when full to increase player’s speed for a certain time, and boost pad which will increase player’s and bots speed for certain time when touched. This game is tested by using three methods which are blackbox testing, alpha testing and beta testing. Based on the testing result, it can be concluded that “CarsTime” has an interesting racing gameplay with hard difficutly on Map Salju and easy difficulty on Map Aspal and Map Pasir.
Website Based Application of Doctor Selection Classification Derive From Patient Complaints Using the C4.5 Method and K-Nearest Neighbor
Authors: Hendri  , Christanti Mawardi Viny , Dali Santun N
Published: December 2020

This paper is about web based application of doctor selection classification, derive from patient complaints by utilizing the C4.5 method and K-Nearest Neighbor. Classification is the process of grouping things based on classes with the characteristics of similarities and differences. This objects or entities are labeled as user complaints. User complaints are classified and produce a category of doctor that matches the user’s complaints. This application will be using sample data from ascertain the opinions and experience of Doctor Yohannes Cahyadi who practices at the Griya Kasih Indah Clinic and from the website alodokter, hellosehat, docdoc.com, cicendoeyehospital, and the eye clinic Nusantara. The purpose of making a doctor selection classification application based on patient complaints is so that the user can find out the doctor’s category recommendations in accordance with user complaints input on this application. The test results obtained said that the best classification accuracy is to use the K-Nearest Neighbor method with an accuracy value of 100%, this shows that the use of the C4.5 method and K-Nearest Neighbor can provide recommendations for the right doctor with user complaints.
The Simple Boxplot Method for an Effective Prediction
Authors: Reonaldo  , Dolok Lauro Manatap , Erny Herwindiati Dyah
Published: December 2020

This study aims to do a prediction of demand goods at a factory for 1 day ahead using double moving average method and comparing the forecasting results. Data source come from two different types of data which are complete data and clean data. Clean data was an optimal data that has been cleaned from outlier using boxplot method. The data source used in the calculation is simulation data for 945 days. Based on the test results, Shows the results of forecasting using complete data that is equal to 4692 with MAPE 6.88 while the results of forecasting use clean data that is equal to 4876 with MAPE 3.84. From these results, it can be concluded that forecasting using clean data is more accurate than forecasting using complete data because the smaller the error rate (MAPE) produced, the better the accuracy.
Experimental study on luminous intensity of white LEDs of different configurations
Authors: Abdul Alim Md , Abdullah M. Z. , Abdul Aziz M.S. , Kamarudin R. , Purna Irawan Agustinus , Siahaan E.
Published: December 2020

The relationship with input voltage to the light intensity at constant current supply of four (04) separate white LEDs containing different number (5,9,13 and 27 pcs) of SMD chips are investigated in this research. Voltage between 10 and 16 volts is applied to LED lights at constant current supply. The light intensity produced by the LEDs was measured. Light intensity was found linear related to the voltage. The phosphor coating over the chips are also observed by microscope and found that the light intensity has an important impact on phosphor coating. The light intensity found lower than the expected due to the non-uniformity of phosphor coating.
Business to Business E-Commerce Sales System Using Web-Based Quotation: a case study on Company X
Authors: Leovin Andreas , Tji Beng Jap , Dewayani Ery
Published: December 2020

The use of information systems in the era of industry 4.0 has now developed so rapidly that the production process runs with internet technology as the main support. At present, information technology has been widely used in various circles because it can simplify and shorten time required for daily tasks. Because of this the sales program is designed to support current business processes so as not to lag behind other business competitors.
CV.X Website-based Application to Improve Fish Marketing: Case Study on X LP
Authors: Valentino Febri , Tji Beng Jap , Wasino
Published: December 2020

Website application is used to improve fish marketing at X LP located in Muara Angke, North Jakarta. An innovation in fish marketing is needed in order to increase fish sales. Muara Angke is located on the north coast of Jakarta. Fish caught by fishermen are sold and distributed to the community through the Muara Angke area. Through this website application, X LP wishes to provide convenience to people who want to get fresh fish at prices that are more competitive than the general market or supermarket.