bluuebunny/crossref_metadata_2025_split huggingface dataset:
Lean Manufacturing Production Management Model using the Johnson Method Approach to Reduce Delivery Delays for Printing Production Lines in the Digital Graphic Design Industry
Authors: Gomero-Campos A , Mejia-Huayhua R , Leon-Chavarri C , Raymundo-Ibañez C , Dominguez F 
Published: April 2020

Abstract
Several factors compel graphic design companies to improve efficiency and competitiveness in their production lines. However, these companies are not prepared to take on this challenge, as they report delays in 20% of their deliveries, caused by high setup times, low machine availability, and poor work scheduling. In this context, this study proposes a new production management model fed by the interaction of lean manufacturing tools and the Johnson scheduling method. This model has been validated by direct application at the SISSA. The results obtained were the reduction of the setup time to 15 minutes, increased machine availability up to 24%, and an efficient scheduling of its tasks. All of these reduced the percentage of delivery delays from 20% to 6%.
TPM Maintenance Management Model Focused on Reliability that Enables the Increase of the Availability of Heavy Equipment in the Construction Sector
Authors: Palomino-Valles A , Tokumori-Wong M , Castro-Rangel P , Raymundo-Ibañez C , Dominguez F 
Published: April 2020

Abstract
The purpose of this paper is to present a maintenance study focused on total productive maintenance (TPM) and reliability-centered maintenance (RCM). Its approach is based on the first pillars of TPM, preventive and autonomous maintenance, as well as the FMEA analysis of RCM for maintenance analysis, which was conducted in this study. The implementation of TPM was successful in that various preventive maintenance (PM) policies assigned to the assets were implemented and it was demonstrated that TPM application in the construction industry could reduce the excessive accumulation of maintenance with the same effective optimization, and with support from RCM analysis and its heavy equipment systems analysis. Excessive corrective maintenance accounts for high investment and delay rates in work times of the assigned project. Traditional methods of availability guarantee, such as reactive or routine maintenance, are insufficient to satisfy a heavy equipment maintenance plan; therefore, what is called for is the systematic application of RCM and TMP because they allow the selection and application of effective PM tasks. An approach that develops and thoroughly analyzes the strategies of continuous corrective and PM is used with an atmosphere of uncertainty and with operational data limited by criticism. Results show a 90% improvement in availability.
Theoretical Study of the Absorption Refrigeration Cycle Using Water-Lithium Bromide as Working Pair for Cold Storage Application
Authors: Sofyan Sarwo Edhy , Farhan Muhammad , Khairil  , Jalaluddin  , Akram  
Published: April 2020

Abstract
This study aims to investigate the performance of a cooling absorption of the water-lithium bromide cycle for a cold storage application which has a capacity of five tonnes of fish. The cooling absorption system utilizes the waste heat of a 6 MW steam power plant as the heat source for the generator. The thermodynamics analysis is carried out to determine both the heat rejection rate of the power plant and the performance of the refrigeration absorption cycle. The performance of the cooling system is investigated by varying the temperature of each component of the refrigeration absorption cycle (i.e generator, absorber, condenser, and evaporator). Also, the influence of temperature on the heat input (to the generator), heat output (from the absorber), and the pump power, is examined. The results show that the Coefficient of Performance (COP) of the refrigeration absorption system increases when the temperature of the absorber, condenser, and evaporator rises. On the contrary, increasing the temperature of the generator leads to the reduction of the COP of the system. It is also found that the pump power increases when the temperature of the absorber rises, while on the contrary decreases when the generator temperature increases. The results also reveal that the amount of heat input into the generator is directly proportional to the temperature of the generator. While the heat output of the absorber decreases when the temperature of the absorber increases.
Production Management Model Based on Lean Manufacturing and Change Management Aimed at Reducing Order Fulfillment Times in Micro and Small Wooden Furniture Companies in Peru
Authors: Castro-Chara R , Valenzuela-Leandro R , Chavez-Soriano P , Raymundo-Ibañez C , Dominguez F 
Published: April 2020

Abstract
This research study seeks to identify and prioritize the causes of order fulfillment delays in a small wooden furniture manufacturing company. The authors propose a 5-phase Lean Optimization model to address and reduce this problem. Post-implementation results yielded a 54.87% reduction in material search and transportation times, a 32.86% reduction in travel times between stations, and a 19.81% increase in line efficiency. In addition, order fulfillment percentages increased from 12.5% to 60%.
Lean production management model under the change management approach to reduce order fulfillment times for Peruvian textile SMEs
Authors: Durand-Sotelo L , Monzon-Moreno M , Chavez-Soriano P , Raymundo-Ibañez C , Dominguez F 
Published: April 2020

Abstract
Currently, small- and medium-sized enterprises face order fulfillment issues, thus generating reduced service levels. In addition, these companies are usually not aware of the importance of continuous improvement tools or of training staff as a mitigation strategy for this situation. Within this framework, the authors performed a literature review to compile production models through which downtimes could be reduced. The production model designed therefrom comprises Lean Manufacturing and work study tools within a Change Management approach. This design focuses on model implementation by small companies without requiring large investment, cutting-edge technology, or qualified personnel. Finally, an application case study was conducted in a small textile manufacturing company located at the Gamarra Fashion Center in Lima, Peru. The results that were reported revealed that late order fulfillment instances reduced by up to 18%, which had an impact on downtimes, unnecessary movements, and in-process inventory levels, thus increasing productivity by 85%.
Investigation into time evolution of chlorine emission in pulsed CO2 laser induced breakdown spectroscopy (LIBS)
Authors: Sari A M , Lahna K , Ramli M , Kurihara K , Idris N 
Published: April 2020

Abstract
Detection of chlorine (Cl) using LIBS technique is greatly influenced by experimental conditions including the delay time of the detecting device. Time evolution of Cl emission in plasma produced on polyvinyl chloride (PVC) sample using CO2 laser with variation of delay time has been carried out. The plasma was produced at atmospheric pressure under different environment of helium and air, respectively. It was found that when using the pulse energy of 750 mJ under helium surrounding, strong emission line of Cl at 479.45 nm can be observed until 4 μs of delay time, while when using laser energy 2500 mJ strong Cl emission line can be observed until 7 μs. The higher signal to background ratio was observed at delay time of 1 μs. However, Cl emission line cannot be detected under air environment.
Spatial analysis for calculating closest distance of operators’ location to Base Transceiver Station (BTS) in Banda Aceh city
Authors: Nizamuddin  , Afidh R P F , Ardiansyah  , Sofyan H , Anisah N 
Published: April 2020

Abstract
Base Transceiver Station (BTS) is used to generate auxiliary signal for cellular uses. BTS will support all the activities regarding data exchange such as messaging and web browsing. The spatial data plays important role to support BTS’s signal coverage area. The spatial data also can be used for designing of new cellular networks and construction new BTS. This research purpose is to help operator manager find the distance of BTS distribution that will be used to make group of BTS position for the operators. In this research Geographic Information Systems (GIS) has been utilized to analyse the nearest distance and to create group of BTS. Spatial network analyst uses network data path to find out the nearest distance from operators’ location to all of BTS in Banda Aceh by using tools closest facility, and to analyse the operators’ location grouping based on the mean value BTS distance by using buffer method. The result of this research has calculated the average distance from the operators’ location to all BTS is 6.2 Kilometres. Based on the average distance the first team will manage 7 BTS and the second team will manage 14 BTS.
A Genetic Algorithm to Determine Research Consultation Schedules in Campus Environment
Authors: Idroes R , Maulana A , Noviandy T R , Suhendra R , Sasmita N R , Lala A , Irvanizam  
Published: April 2020

Abstract
Scheduling algorithm is one of computation problem with high complexity. One of the problems is a difficulty to determine an optimal scheduling alternative that is adjusted with the constraints needed. This study aims to test whether the Genetic Algorithm (GA) program that was built was successful for maximizing the value of fitness. The data used in this study is data simulation from the GA Program. Based on the result of this study, we can concluded that the GA program can be used for scheduling because it has good accuracy. This can be seen from the fitness value of 1 and there is no clash between one schedule and another schedule and there are no restrictions that are violated.
Safety factors and stability analysis of escape hill critical high towards tsunami free-board and run-up level
Authors: Munirwansyah  , Irsyam M , Munirwan R P , Yunita H , Munirwan H 
Published: April 2020

Abstract
Earthquake threats that had caused tsunami hazards with a lack of optimal efforts in the construction of evacuation sites, it is necessary to conduct studies on evacuation sites as escape hill. One method of overcoming building construction on the effect of freeboard and run-up level of vertical walls in one of tsunami evacuation models that need to be analyzed for the maximum height that is suitable against the lateral force of tsunami wave. This study’s purpose is to calculate the stability of slope and embankment high on escape hill and calculate the safety factor of soil bearing capacity. The data obtained from the undisturbed sample are then taken to the laboratory for physical and mechanical properties analysis and slope failure of escape hill calculated using the finite element method. This study of maximum embankment height the escape hill for evacuation site, stability obtained at an altitude of 10.0 m and safety factors are 2.14 to 2.84 which is very safe. From the material set design that has been done, it is shown that the modeling of materials set with variations of soil cohesion value (c) and the value of the shear angle in the soil (φ) the safety factor of 2.412.
Modeling of groundwater level fluctuation in the tropical peatland area of Riau, Indonesia
Authors: Pratama H , Sutikno S , Yusa M 
Published: April 2020

Abstract
The groundwater level (GWL) is a key parameter for assessing the level of fire risk in the peatland so that if the predicted fluctuations of GWL in the next few days or weeks can be predicted; the risk of peat fire can also be estimated. The purpose of this study is to develop a hydrological model using regression analysis that can be used to predict GWL in the peatland. The data used for modeling were historically recorded of rainfall and GWL fluctuations from SESAME equipment in Dompas village, Riau, Indonesia. Regression analysis was carried out using four data length scenarios, such as one-month, two-months, three-months, and six-months to find out which time period could represent hydrological conditions in the field. The results showed that the regression analysis using three-months and six-months data represented the best results of the GWL prediction with a correlation coefficient of 0.95. However, the prediction using one-month and two-months data represented reasonable prediction results with a correlation coefficient of 0.86 and 0.89 respectively. Judging from observed and predicted GWL that was always in the lower position than 0.4 m depth, this area was always in the high risk of peat fire throughout the year.
Response structure analysis of prestressed box girder concrete bridge due to earthquake loads
Authors: Miranda M , Suryanita R , Yuniarto E 
Published: April 2020

Abstract
The damage of the bridge structure that occurs in Indonesia is almost close to the number of bridge construction. The damage condition is also related to the influence of Indonesia on active tectonics and volcanic pathways which cause damage to the bridge structures. The analysis of the structural response of the prestressed box girder concrete bridge aims to identify the value of the displacement structure on the bridge pier against the earthquake load. Meanwhile, the structure responses numerical analysis of the prestressed box girder concrete bridge using MIDAS CIVIL software. The analysis of structure response prestressed box girder concrete-bridge structure is carried out with three soil conditions, that is hard soil, medium soil, and soft soil. The results of the study, the displacement value on the pier bridge on X direction for hard soil conditions is 1.26 cm, medium soil is 1.53 cm, and soft soil is 2.02 cm. Thus, it can be concluded that the value of the bridge displacement due to the planned earthquake load on hard soil conditions is 21.4% smaller than that in the medium-soil condition and 60.32% smaller than the soft soil.
Fire risk analysis based on groundwater level in rewetting peatland, Sungaitohor village, kepulauan Meranti district, Riau province
Authors: Silviana SH , Saharjo BH , Sutikno S 
Published: April 2020

Abstract
The hydrological condition of peatlands is one of the important factors affecting peatland’s vulnerability to fire. The groundwater level (GWL) of peatlands or so-called groundwater depths is an indicator in determining the hydrological balance of peatlands. In normal conditions, peatlands are not prone to fire because they are able to hold and absorb water. Drainage on a large scale on peatlands causes the peat water level to drop so that the peat experiences water loss and is prone to fire. The disruption of the hydrological balance of peatlands can be seen in the wet month, when the water level is not much different from the conditions on a dry moon, which is still below the surface, causing peat to become flammable. The focus of this study was to determine the level of risk of fire vulnerability based on groundwater levels in peatlands, which was carried out restoration efforts, in the form of rewetting. This study, as a piece of early warning information on forest fires on GWL measurements of >40 cm, especially in the peatlands of Sungaitohor Village, Tebingtinggi Timur District, Kepulauan Meranti Regency, Riau Province. Groundwater level measurements were carried out directly in the field by installing 66 monitoring well points placed on different land uses (33 in unburned areas and 33 in burnt areas) during February - June 2019. The results showed that this region, in general, had a high level of risk of forest and land fires. The highest level of fire risk based on GWL >40 cm (danger category) was 99.63% in March. The high value of GWS >40 cm in this region made very susceptible to forest fires. In addition, extreme weather worsened the condition of peatlands into drought and was prone to fire.
Slope stability analysis due to extreme precipitation
Authors: Gunawan H , Al-Huda N , Sungkar M , Yulianur A , Setiawan B 
Published: April 2020

Abstract
Slope stability analysis due to extreme weather, i.e. precipitation is an interesting topic to investigate in the high rainfall region. This paper aims to investigate the effect of extreme rainfall on slope stability. A study case at a location inside the highly vulnerable formation in Aceh-Indonesia to failure, which is Tutut Formation, was carried out. Soil samples at the investigated site were collected and tested for further examination. The geometry of the landslide location was measured using Theodolite. Both the soil and surface geometry data were used to develop a computer model from which the slope failure was justified. A failure mechanism due to extreme precipitation is suggested. This finding is consistent with the field observations.
Spray drying of mangosteen (Garcinia mangostana L.) juice and analysis of antioxidant activity and total phenolic content
Authors: Setyawati DM , Mardliyati E , Rahman S , Wijaya AF 
Published: April 2020

Abstract
Mangosteen contains natural antioxidant compounds such as polyphenolic compounds. It is most fresh consumed and can not be stored for long especially after separated from its pericarp. One alternative to extend the shelf life is by drying the mangosteen fruit. Spray drying was investigated to this study to produce mangosteen juice powder which was examined for antioxidant activity and total phenolic content. Mangosteen juice powder was dried with the addition of maltodextrin in a ratio of mangosteen: maltodextrin of 10:90; 30:70 and 50:50, which mangosteen was based on total solid value. Spray drying was carried out in 2 inlet temperatures condition, 140°C and 160°C, to observe the effect of temperature on antioxidant activity and total phenolic content. These 2 inlet temperatures of spray dryer did not affect the physical appearance, colour, taste, and aroma of mangosteen powder. Increment of spray dryer temperature did not show significant differences in total phenolic content and IC50 of antioxidant activity, except IC50 in the ratio of 50:50. At the ratio 50:50, the increment of spray dryer temperature decreases the antioxidant activity. Therefore, spray drying is a prospective drying option for mangosteen juice at the appropriate addition of maltodextrin and temperature process. It should maintain the physical and chemical properties of mangosteen and finally support ease of storage and shipping.
Preparation and Characterization of Activated Carbon from Gayo Coffee Shell as an Adsorbent for Removal of Lead (Pb) in Liquid Waste
Authors: Juniar L , Mariana  , Mulyati S , Fathira D , Safitri R 
Published: April 2020

Abstract
Adsorption been a popular low-cost and environmentally friendly method that can be used to reduce heavy metals in wastewater especially with the use of biomass-sourced sorbents. In this study, the adsorbent was prepared from the coffee shell. The Performance of the prepared adsorbent was studied on the adsorption of Pb(II). The initial concentration of Pb(II) solution used was 300 mg/L and contact time was varied to 0, 30, 60, 90, 120 and 150 minutes. The characteristics of the sorbent were studied in terms of moisture content, ash content, and adsorption of I2. Further characterizations of the coffee shell sorbent were also carried out using Scanning Electron Microscopy (SEM), Fourier Transform Infra-Red Spectrophotometer (FTIR), X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF) and Surface Area Analyzer (SAA). The characterization results showed that the prepared sorbent meets the quality requirements according to SNI 06-3730-1995. The results from the adsorption process revealed that the maximum absorption capacity that can be performed by sorbent was 170.26 mg/g at the equilibrium time of 90 minutes. In conclusion, the coffee shell can be a potential biomass material to prepare adsorbent with high removal performance of heavy metal.
Pharmaceutical Emerging Pollutant Removal by Thin Activated Carbon Coating: Equilibrium, Kinetic, and Thermodynamic Studies
Authors: Shamsudin Muhamad Sharafee , Ismail Suzylawati 
Published: April 2020

Abstract
In Malaysia, issues of pharmaceutical pollutant have been highlighted recently. Acetaminophen (analgesic) also known as paracetamol that usually used to reduce moderate pain such as headaches, menstrual periods, cold/flu aches and fever. There are a large amount of acetaminophen has been detected in sewage treatment plants in Malaysia. Unfortunately, sewage treatment plants are not effective enough to overcome this kind of pollutant. Therefore, in this research study, a new approach applying adsorption concept is introduced. Thin activated carbon coating (TACC) for adsorption of acetaminophen (ACT) was investigated. The TACC is formulated using Epoxidized Neutral Rubber (ENR-50) and poly(vinyl) chloride (PVC) as binders with activated carbon as an adsorbent, then was coated on white cotton fabric via brushing technique. Characterization analysis using SEM-EDX and BET analysis were performed. The pore volume and surface area of the TACC are 0.07 cm3/g and 64.3 m2/g, respectively. The TACC was evaluated through varies parameters including different initial concentrations and temperatures. The amount of ACT as adsorbate, 50 mg/L, able to be adsorbed up to 33.3 mg/g into TACC within 5 h. The result of equilibrium and kinetic studies indicated that Freundlich isotherm model and pseudo-second-order, respectively, are best fitted the adsorption of ACT onto TACC. It was decisive that the adsorption process of ACT on TACC is spontenoous (Δ G° <0) and exothermic (Δ H° <0) through thermodynamic studies.
Transesterification of refined bleached deodorized palm oil (rbdpo) using novozym® 435 to produce biodiesel
Authors: Manurung R , Hasibuan R , Sari B I , Wulandari R , Siregar A G 
Published: April 2020

Abstract
As a renewable energy source, biodiesel is an alternative fuel that is environmentally friendly, and non-toxic. Conventionally, biodiesel is mostly produced by a transesterification reaction of triglycerides with short-chain alcohol in the presence of an acidic or basic catalyst, but it requires high energy, difficult in the purification of glycerol and there is the possibility of soap formation. Currently, the process production of biodiesel has been directed to the enzymatic process. The enzymatic process can produce high-purity products because it is easy in removing by-products such as glycerol. Novozym® 435 have been reported as a biocatalyst which indicates a high conversion and able to catalyze a variety of organic chemical reactions. It is biodegradable, no possibility of soap formation, and can be used repeatedly. Ethanol used as an acyl acceptor because it is more renewable than methanol. The reaction parameters that used in this research were the molar ratio of raw material to ethanol, temperature reaction, and reaction time. The best result obtained in 7 hours reaction time at 40 °C was 98,83 % of ester yield with a molar ratio of ethanol and RBDPO was 6:1 and the catalyst dosage was 30 % (w/w). Based on the results, it shows that Novozym® 435 is a good biocatalyst in enzymatic transesterification process for biodiesel synthesis.