bluuebunny/crossref_metadata_2025_split huggingface dataset:
Propose Improvement Maintenance Activities Of Screw Press To Reduce Waste Using Lean Maintenance Concept
Authors: Sidabutar NA , Matondang AR , Hidayati J 
Published: July 2019

Abstract
Maintenance is an important factor to achieve the goal of becoming the best manufacturing company. To achieve the company that has the best performance, the treatment strategy should be linked to strategies such as the concept of lean manufacturing. Lean maintenance is a process to achieve continuous improvement. This system focuses on adding value and reducing waste in the care process so that maintenance lead time can be reduced, as well as identifying the waste that occurs in the activity of a treatment using Value Stream Maintenance mapping (VSMM), identify the factors that cause waste most dominant use of Root Cause Analysis (RCA ), identifies the critical part of the screw press machine using Reliability Centered Spares (RCS) and provide recommendations for improvements screw press machine maintenance activity. Problems often occur is the waste to the type of waiting where the facts occurred in the field is a process of waiting for components, equipment and transport documentation wait staff, thereby extending the time to repair any damage. This study aims to reduce waste waiting in the screw press machine maintenance activity. The most high maintenance time is the first press of 10 132 minutes. The dominant type of waste is waste waiting that contribute to waste by 35%. a critical component of body cage, cage feed, feed worms, and main shafts. Improvement maintenance systems that do reduce the lead time on the first maintenance ress be 5,100 minutes.
Chiller faults diagnosis: a case study
Authors: Firdaus Nofirman , Prasetyo Bambang Teguh , Luciana Thomas 
Published: July 2019

AbstractFailure detection and diagnosis (FDD) is one of the condition-based maintenance methods. Implementing chiller FDD one could identify the failure and locate where the failure occurs. With the ability to detect and locate the failure, proper maintenance action could be taken to remedy the situation. In most cases, it could restore the performance and extend the useful life of an asset. One of the well-known FDD methods is a Simple Thermodynamic Model (STM). In this paper, a chiller in a commercial building in Jakarta is subjected to the implementation of STM model. The chiller was monitored before and after maintenance. The necessary operating parameters were recorded and processed then they were used to identify two parameters of the STM model by regressing the STM equation. Based on the result, the faults could be detected and located during four different measurements time; on the second month, the eight-month, the eleventh month, and twelfth month. The results show that the STM model is able to detect the faults and locate where the faults have occurred.
Utilization of magnetic devices to improve the performance and reduce gas emissions of Otto engine
Authors: Hazwi M , Sitorus T B , Arjuna J , Sinaga P 
Published: July 2019

Abstract
Utilization of magnetic instrument is one effort to improve the performance and reduce exhaust emission produced by Otto engine. The experiments are done by varying the engine speed and variation of magnetic instrument mounting distance to the inlet valve when entering the combustion chamber. A magnetic instrument is installed in the intake manifold, before heading into the combustion chamber. The experimental results show that it is found that there is an increase in thermal efficiency and decreasing of fuel consumption when the engine uses 2500 gauss magnetic instrument ranging from 5.99 to 22.02%. The emissions of exhaust gas produced also reduced for CO and HC levels about 6-20%.
Reducing waste in production process with lean six sigma approach and weighted product method
Authors: Siregar Khawarita , Ishak Aulia , Purba Trie Dinda M 
Published: July 2019

Abstract
PT XYZ is a company engaged in the production of pesticides. There are some problems in production process that cause inability to full fill the production quantity target without doing overtime. the problem is the existence of activities that are not value-added and products defect. There are 48,73 % non value added activity and in 2017 the average of products defect reaches 3.89% of total production. This can affect the quality of the products produced to compete with similar companies. This problem is solved by Lean Six Sigma approach. Based on research conducted Lean current condition is PCE (Process Cycle Efficiency) equal to 51,27%, process velocity equal to 0,082 process / hour. The research shows that quality performance at the first phase inspection was 3.77 sigma, on phase II was 3.85σ. The most common product defect is a leaky bottle, an oblique stamp, a torn/wrinkled label and a missing / blurry label. The proposed improvements are the application of the 5S and weighted product method. Based on estimation result, the process cycle efficiency and process velocity was increased to 55.07% and 0.071 process/hour respectively, Quality performance in the inspection phase I is 4.20 σ and on phase II is 4.40 σ.
The experimental study of the coolant flow rate of an ethylene glycol-mixed water to the heat transfer rate on the radiator
Authors: Manik T U H S G , Sudrajat G , Sitorus T B 
Published: July 2019

Abstract
This study was conducted to determine the rate of the heat transfer in the radiator. There are two types of hot fluid, namely water and an ethylene glycol-mixed water of 50%. The water entry into the radiator at the temperature of 80°C. The inlet water varied by 0.00000067 m3/s, 0.00013 m3/s, 0.0002 m3/s, and 0.00027 m3/s, and the air release is 1.489 m3/s. The results indicate that the higher the flow of water flowing on the radiator pipe causes a radiator heat transfer rate increase. The best water releases for the radiator test is 0.0002 m3/s. The enhancement of qh increases of 655.26 W or up to 13.06%, qc increases of 402.04 W or 7.57%, Uh increases of 41.3 W/m2K or 11%, Uc increases of 4 W/m2K or 5.67%, and effectivity increases 2.35%.
Determining design parameter for fuel magnetizer using factorial design method
Authors: Purwandari A T , Suzianti A , Komarudin  
Published: July 2019

Abstract
Fuel magnetizer is a magnetic device that can improve the combustion efficiency on vehicles or other combustion systems. Many studies have been studied about the effect of fuel magnetizer on fuel viscosity or combustion efficiency, fuel savings, and emissions reductions. This study aims to identify the main factors that can influence on the performance of fuel magnetizer and optimal fuel magnetizer parameters in gasoline generator set and LPG gas stove using Factorial Design method. This study used three factors with each factor consist of two levels. The result shows that the optimal parameters of fuel magnetizer in generator set are fuel magnetizer with Ferrite C8 magnet type, polarity repel each other with the liquid flows parallel to the lines of force in the magnetic field (mono-polar) with one magnet pair installed on the fuel pipe. It can increase 10.05% duration of fuel consumption. While optimal parameters of fuel magnetizer in LPG gas stove are used fuel Ferrite C8 magnet type, mono-polar polarity, and use two of magnet pairs installed on fuel pipe. It decrease 7.69% of water heating time.
Application Of Six Sigma Methodology To Improve the Product Quality Of Moldings Plastic (Case Study: PT Mega Technology Batam)
Authors: Setyabudhi Albertus Laurensius , Sanusi  , Sipahutar Ilhamyah 
Published: July 2019

Abstract
Competition in the business and industry increase significantly encourages companies to develop thoughts to obtain effective and efficient ways and save costs in achieving the determined goals and objectives, Six Sigma method is one of an excellent method to increase productivity and pressing the number of defects to target 3.4 failure of opportunity for each transaction of goods and services products. Six sigma approach was implemented in this research. The objective of this research is to improve the product quality and to analyze failures or defect of Cover Coffe Maker Product. This research implemented six sigma approach starting from define, measure, analysis and improve stage. Data processing by using Check Sheet, cause diagram, histogram, pareto chart, run chart, and control chart, and scattered diagram to solve the problem of work faced. The result of the research shown that PT Mega Technology Batam currently has the total average disability is 197464 pcs with percentage of 5.99% and total DPMO 59929,39 equal to Sigma Level 3.1. The causes of Cover Coffe Maker’s disability are the Operator or the machine interpreter does not have a good attitude, the absence of training on every new employee, the employee repeat the same mistake, not using original material and standard from a predetermined company, Not having enough experience during machining operation, At the time of the molding process does not adjust the temperature or humidity following the Parameters on the machine and the Mold standard, does not follow the quality without tolerance. In conclusion, The Six Sigma implementation resulted in a significant increase of product quality.
Classification of Design Attributes for FMCG (Fast Moving Consumer Goods) Products Official Store in E-commerce Website to Increase Usability and User Satisfaction
Authors: Ramadhan B A , Lestari R A , Muslim E 
Published: July 2019

Abstract
The purchase of FMCG products through e-commerce websites is currently growing rapidly and will continue to improve in the following years. E-commerce companies collaborating with the FMCG company to create an official store on e-commerce websites. Official store for food and personal care products is a strategy where e-commerce and FMCG company like create an official store where the FMCG company can directly sell their products officially with an online system on e-commerce websites. Official store on each e-commerce website has a different interface design that aims to increase user satisfaction and usability. This study aims to classify design parameters according to user expectations and satisfaction and give strategies to increase the usability of the official store in e-commerce websites for FMCG products. Result in this study indicated that attributes design provide maximum contribution to the overall usability and satisfaction of the websites.
Ultrasound device selection by using F-ANP and COPRAS
Authors: Napitupulu Humala L 
Published: July 2019

Abstract
Each company at a given moment must choose and decide on a required device from among the alternatives available in the market, which have distinct advantages and disadvantages to each other, such as the selection of Ultrasound as a medical device by a medical service unit. Selection can be done by using the “Fuzzy Analytic Network Process” and the “Complex Proportional Assessment” (COPRAS) method. Fuzzy ANP is used to determine the selection criteria with the highest weight, and then COPRAS is used to determine the best ultrasound sequence based on selection criteria obtained by Fuzzy ANP. The use of fuzzy ANP can give five criteria with the highest weight, and COPRAS shows the best among the five ultrasound alternatives. Each company at a given moment must choose and decide on a required device from among the alternatives available in the market, which have distinct advantages and disadvantages to each other, such as the selection of Ultrasound as a medical device by a medical service unit. Selection can be done by using the “Fuzzy Analytic Network Process” and the “Complex Proportional Assessment” (COPRAS) method. Fuzzy ANP is used to determine the selection criteria with the highest weight, and then COPRAS is used to determine the best ultrasound sequence based on selection criteria obtained by Fuzzy ANP. The use of fuzzy ANP can give five criteria with the highest weight, and COPRAS shows the best among the five ultrasound alternatives. Each company at a given moment must choose and decide on a required device from among the alternatives available in the market, which have distinct advantages and disadvantages to each other, such as the selection of Ultrasound as a medical device by a medical service unit. Selection can be done by using the “Fuzzy Analytic Network Process” and the “Complex Proportional Assessment” (COPRAS) method. Fuzzy ANP is used to determine the selection criteria with the highest weight, and then COPRAS is used to determine the best ultrasound sequence based on selection criteria obtained by Fuzzy ANP. The use of fuzzy ANP can give five criteria with the highest weight, and COPRAS shows the best among the five ultrasound alternatives. Each company at a given moment must choose and decide on a required device from among the alternatives available in the market, which have distinct advantages and disadvantages to each other, such as the selection of Ultrasound as a medical device by a medical service unit. Selection can be done by using the “Fuzzy Analytic Network Process” and the “Complex Proportional Assessment” (COPRAS) method. Fuzzy ANP is used to determine the selection criteria with the highest weight, and then COPRAS is used to determine the best ultrasound sequence based on selection criteria obtained by Fuzzy ANP. The use of fuzzy ANP can give five criteria with the highest weight, and COPRAS shows the best among the five ultrasound alternatives.
Design of a heat exchanger of three concentric tube layer on contrary flow
Authors: Lubis Z , Manik T U H S G , Rinkanto M , Sitorus T B 
Published: July 2019

Abstract
Heat exchangers is a device that produces heat transfer from one fluid to another fluid. This study was conducted to design and build triple concentric tube heat exchangers with counterflow which is used to reduce the temperature of the hot fluid. The hot fluid flows in the annulus section on the second copper tube, then the cold fluid each flows through the first copper tube and annulus portion to the third copper tube. The hot fluid which is water with temperature 60ºC, to heat fluid used water heater with power 1000 watt while cold fluid which is air with temperature 25ºC. These four concentric tube heat exchangers with a total length of the first 2.57 m copper tube with 1½ inch diameter. The second copper tube is 2.22 m in diameter of 1 inch. The copper tube is 1.74 m long with a diameter of 1 ¾ inch. The fluid in and out fluid temperature gauges on the heat exchanger can be measured thermocouple which are then processed by software instacall and Tracerdag from a computer through the data acquisition module.
Effectiveness Analysis of Social Media Ads as A Promotional Media (Case Study: Instagram Taya.Id)
Authors: Tripiawan W , Amani Husni , Wijaya A T 
Published: July 2019

Abstract
Technological development at the moment affected the trend in the global marketing. This development makes the marketers to change marketing strategy them into the internet marketing one of which is taya.id who want to focus on online shop course in the hope of products marketed can penetrate the global market. The sample techniques used to research is purposive sampling on ever buy taya.id products and get information about the product taya.id through account social official media taya.id. In total, 100 respondents were collected as the sample of this research. This research using the EPIC model as a method calculation effectiveness consisting of four namely empathy dimension, persuasion, impact, and communication. The result of this research and examining evidence and proving that the call social media taya.id is considered effective with a value of up 2,752 as to dimensions empathy, the value of 2,742 as to dimensions persuasion, the value of 2,722 as to dimensions impact, and value of 2,895 as to dimensions communication. In overall, this finding concludes that the advertising of Taya.id through Instagram is effective.
Identify the performance of government agencies for city fire prevention and firefight by the balanced scorecard method (journal review )
Authors: Hidayati Juliza , Nisak Khairun 
Published: July 2019

Abstract
Fire prevention and firefighting service is a matter of general concern at this time. The symptoms that occur in each event vary of both natural factors (natural disasters) and non natural factors difficult to predict. Natural factors in the form of lightning strikes, volcanic eruptions, drought and so forth. Non-natural factors of human error disasters that used as gas, combustible fuel, short electrical connections, cigarette butts, gas fuel gas, sabotage, lack of fire protection against buildings and others. The required facilities include various functions and fire extinguishers in carrying out their duties including firefighting, air supply and good technological systems both equipment technology and information technology[3]. One of the methods used in the Balanced Scorecard approach. This new approach to strategic management for the first time in detail was introduced in a series of articles and books by Kaplan and Norton (2004)[1] with four perspectives: Finance, customer, internal business processes and Learning and growth. The financial perspective is intertwined with a management perspective with the aim that the vision and mission can be achieved by summarizing all internal and external problems by forming a function group discussion in determining objective strategies and Key Performance Indicators.
Analysis of Value Chain Model on Small and Medium Enterprises (SMEs): A Case Study of Coffee Shops in Bandung
Authors: Anggadwita G , Profityo W B , Permatasari A , Alamanda D T , Hasfie M 
Published: July 2019

Abstract
Indonesia is one of countries as the best quality coffee producers in the world. Indonesia’s geographical location is ideal for coffee growth and production, resulting in the diversity of coffee products with distinctive tastes. This led to the development of coffee shop business in Indonesia, especially in Bandung. Coffee business thrives in Indonesia and develops into a business with a scale of SMEs. This study aims to analyze the value chain model in coffee shop business in Bandung by mapping the input-output relationship, and identifying strength factors along the value chain. The research method used qualitative method with case study approach. The informant was determined by purposive sampling technique. Triangulation analysis is conducted to get more accurate and deep of data analysis. The results showed that the main activities and supporters in the coffee shop value chain in Bandung involve four main actors, namely local coffee farmers, coffee traders, processing industries, and coffee shops. This study contributes a similar trend to be observed in other coffee shop business value chains.
Usability Evaluation for User Interface Redesign of Financial Technology Application
Authors: Nugraha A P , Rolando  , Puspasari M A , Syaifullah D H 
Published: July 2019

Abstract
KoinWorks is one of financial technology in Indonesia that running its businesses with online peer to peer lending model based on mobile application. The number of KoinWorks mobile application users is increasing however there are still some obstacles along the way. Canceled order rates of KoinWorks are still quite high. In 2017, there are only 7,5% of the total users who actually did the transaction. In addition, the result of a preliminary study conducted on 114 respondents shows that nearly 75% of the users find it difficult to use the application. This study aims to evaluate the usability of KoinWorks mobile application, to analyze the existing usability problem, and to achieve a better usability interface design. Usability is measured using both quantitative and qualitative measurements. The quantitative measurement comprises user performance metrics such as task success, time on task and error that measure effectiveness and efficiency of the mobile application as well as saccade on eye tracking. The qualitative measurements include the System Usability Scale questionnaire (SUS), Questionnaire for User Interface Satisfaction (QUIS) and Retrospective Think Aloud (RTA). This study shows that KoinWorks mobile application has a poor performance and usability. Interface redesign was proposed and resulted in a better performance and usability.
Utilization of overcured natural rubber latex compound in modified concrete manufacturing
Authors: Harahap H , Nasution H , Haryanto D , Wijaya J 
Published: July 2019

Abstract
Overcured natural rubber latex compound has always become a waste and should be discarded, which is a problem to the environment. Thus, the latex compound waste is used as an alternative material in modifying concrete product. Latex waste is mixed with other materials, such as cement, fine aggregate, hard aggregate, and water. Series of modified concrete is made with variation of the composition of latex waste by 0%, 2%, 4%, 6%, 8%, and 10% of the weight of the cement used. The concrete mixture is then poured into a cylindrical mold with dimensions of 15x30 cm (in accordance with ASTM C39 standards) and cured for period of 28 days. The products of modified concrete have been tested with according standards and the results show that the addition of overcured natural rubber latex compound can reduce the concrete density, reduce its absorption ability and increase the mechanical strength of concrete.
The concrete frame strength test is filled with brick against horizontal loads with several types of column beam joints and several types of brick wall connection frames
Authors: Tarigan J , Sitorus T , Hani S 
Published: July 2019

Abstract
Damages occurred in brick walls in a simple structure because of an earthquake show that walls also withstand the load. The damages may occur due to a lack of quality in the materials and the joint between each element of the wall. Therefore, this research aimed to examine the connections between the wall elements in order to investigate the strength of the walls with ductile and non-ductile connections and its crack behavior. The connection investigated in this study was the connection between the brick wall and beam, the brick wall and column, also the beam and column. The ductile wall connections were built according to the SNI brick walls, and anchors were put on the wall-to-beam and wall-to-column connection. The brick walls were then given load in a horizontal direction. Based on the results, the ductile walls with anchor had the greatest strength with 2.204 kg whereas the ductile walls without anchor had lower strength with 1.929 kg. On the other hand, the strength of the non-ductile walls was 1.653 kg. In conclusion, the absence of anchors that bind the wall-to-column and wall-to-beam reduced the strength by 12.5% whereas the use of non-ductile connections reduced the strength by up to 25%.