bluuebunny/crossref_metadata_2025_split huggingface dataset:
Predicting consumer behaviour in tourism industry: Comparing Structural Equation Modelling (SEM) and multiple regression
Authors: Suhartanto D , Kusdibyo L , Chen B , Dean D , Setiawati L 
Published: May 2020

AbstractThe Indonesian creative tourism industry is currently flouring and competitive. In this competitive industry, the industry players’ capability to predict their tourist behaviour is imperative. However, research to examine method of predicting tourist behaviour in this industry is limited. This study is designed to assess the applicability of SEM compared to Multiple Regression to predict tourist behaviour. This study uses a survey of 403 tourists from tourism attractions in Bandung. The model of tourist loyalty behaviour was assessed and compared using software AMOS (SEM) and SPSS (Multiple Regression). The results show that the model of tourist behaviour tested by using SEM has a sound Goodness of Fit Index. Further, the coefficient of determination of tourist behaviour in the SEM model is higher compared to that of multiple regression model. In addition, this study confirms the effect of experience quality on tourist behaviour. This study reveals that applying SEM has offered a better prediction on tourist behaviour compared to Multiple Regression. This finding improves the theoretical and managerial understanding on the application of SEM in tourism industry.
Scheduling evaluation in construction projects using the critical chain project management method
Authors: Sembiring N , Putra A 
Published: May 2020

Abstract
PT. A is a company engaged in construction, EPC (Engineering, Procurement and Construction), infrastructure investment, property and real estate. The case study that was raised in this study was the construction project of the retaining wall and the ABC dock that was carried out by PT. A. The problem in the project is that the project scheduling is not good, causing delays in project completion. The purpose of this research is to evaluate the scheduling of the project so that the optimum schedule can be obtained in project implementation. The method used in this study is Critical Chain Project Management (CCPM). CCPM is a project scheduling method that can optimize the schedule due to the absence of multitasking. The CCPM begins by estimating the time without safeguarding the existing time on each job by using the Cut & Paste Method. The critical path serves to find out the critical or non-critical work or activity. Critical activities on wall construction projects anchoring land and ABC dock namely work keep directors. Based on buffer consumption monitoring indicators due to the potential for the emergence of waste will end in use of project buffer duration consumed during the 19-35 period day and immediately take action if the buffer is consumed in the period of 36-53 days. Based on evaluation with critical application Project chain management obtained one feeding 4-day buffer and duration of the buffer project 53 days with the existing scheduling period 432 days to 379 days without buffer consumption.
Performance analysis of cogeneration energy conversion system design for RDE
Authors: Irianto I D , Dibyo S , Sriyono S , Salimy D H , Kusumastuti R , Pancoko M 
Published: May 2020

Abstract
An Experimental Power Reactor called RDE is a non-commercial power reactor with the thermal power of 10 MW. RDE is being designed based on the high-temperature gas-cooled reactor (HTGR). The purpose of the RDE designed is to supply thermal energy for experimental purposes and to generate electricity for supplying the electricity in Serpong research area. The energy conversion system of RDE is designed in cogeneration configuration with a Rankine cycle. The outlet reactor coolant temperature of RDE is 700 °C, and the steam temperature at the outlet of the steam generator is 530 °C. The performance analysis of the RDE energy conversion system is concentrated on two parameters are the thermal efficiency and the energy utilization factor (EUF). This research aims to calculate and analyse the optimal of the two parameters in the RDE energy conversion system. Calculation and analysis of the performance of the RDE energy conversion system are performed by simulation using computer code ChemCad. The simulation results show that the energy utilization factor of the cogeneration for the RDE energy conversion system can increase by more than 60%. It can be concluded that the energy conversion system in a cogeneration configuration can increase the EUF.
Collaboration of sustainability and digital supply chain management of achieving a successful company
Authors: Sembiring N , Tambunan M M , Ginting E 
Published: May 2020

Abstract
The high demand from consumer for environmental welfare issues is a driving factor for increased research in management of sustainable supply chain (SSC). The researches in SSC field show that SSC are needed by companies and organization in making the decisions that important to produce products and services related to sustainability. Performance measurement of a SSC, not only measured economically, but also related to social and environmental performance. All stages in the form of planning and managing all activities involved in Supply Chain Management (SCM) such as procurement, conversion, logistics, communication, and collaboration with partners, must be carried out with high quality. The entire management process, especially those relating to supply and demand in and throughout the company must be carried out integrative. This paper indicated that SSCM strategies effects of these collaborative impact considering sustainability in supply chain management to achieve the successful company.
Measurement of operator reliability level using the Human Error Assessment and Reduction Technique (HEART) method
Authors: Rejeki Y S , Achiraeniwati E , Wanda A 
Published: May 2020

Abstract
Workers can cause harm to the company caused by human error. Human error has a close relationship with the level of reliability of a worker. One result of the low level of reliability of workers is product defects. PT. X is a company that manufactures engine and molding spare parts and dies, using automatic machinery. There are defective products on production, with an average number of defects of 1.2% per month above the disability tolerance set by the company of 0.2%. The types of defects in the product are corrugated surfaces, rough surfaces, mismatched pieces, inaccurate sizes, and the presence of foreign matter attached to the product. This product defect occurs in the milling machine. This study aims to determine the level of operator reliability at the milling work station that affects production results. This research is a descriptive qualitative research using the Human Error Assessment and Reduction Technique (HEART) method to determine the level of operator reliability. The biggest HEP measurement results experienced by each operator is when the activity is set up and operating the machine by the program, which ranges from 0.7936 to 0.9104. The level of reliability (Rm) for operators 1, 2, 3 has a value of Rm in succession of 0.4350; 0.3627; 2005. Rm value <0.5 indicates the level of reliability which is categorized as low. This low level of reliability is caused by the absence of work procedure standards, lack of supervision of operator performance, low work morale, lack of operator experience, and no effective communication between the operator and programmer when inputting coding on the machine.
Minimization of WIP inventory cost at CNC-machining centers through assignment of m serial machines and transfer batch size reduction
Authors: Muhammad C R , Nu’man A H , Shofia N 
Published: May 2020

AbstractIn the batch production, the use of a single machine for several stages of the processes will result in waiting time of production batch to be long. It will cause an increase in work in process (WIP) inventory cost. CNC-machining centre is a type of CNC machine that can carries out several stages of processes singly. In some cases, this machine is often single used to make a product through several stages of processes, from raw material to end product. One of the reasons to use a single machine is to avoid transfer from one stage (machine) to next machine. However, single use causes inventory to accumulate due to long waiting times. The objective of this research is to reduce the WIP inventory cost at the CNC-machining centre. Scheduling to minimize WIP inventory cost is done through two steps. First step, divide number of stages of processes to be assigned tomserial CNC-machining centers. Second step, determine transfer batch size is smaller than the production batch size to be transferred to the next stages. The results of this research indicate that there is a reduction in WIP inventory cost by 53.47 percent. Scheduling multi-stage batch production onmmachines with small transfer batch size will reduce WIP inventory cost.
Sustainable supply chain model by using digital partial least square method
Authors: Sembiring N , Dewi I S 
Published: May 2020

Abstract
The high level of demand for crumb rubber had caused a shortage of raw materials used for production. It also causes the greater the quantity of waste produced. This will have an impact on the environment. In addition, the social impact of the waste generated from production will cause restlessness to the surrounding community. Handling this will have an impact on the economic aspects. This study aims to model a sustainable supply chain at PT. X is based on environmental, social and economic performance using the Partial Least Square method. Data analysis was performed by testing validity, reliability testing, and analysis. The results of the study show that the sustainable supply chain model produces a positive relationship with environmental, social, and economic performance.
Multiple item batch scheduling model on a batch processor to minimize total actual flowtime parts through the shop
Authors: Hidayat N P A , Oktaviani T D A , Halim A H 
Published: May 2020

Abstract
This research is to address a problem of scheduling batches consisting of multiple item parts processed on a batch processor where each item requires a certain processing time which may differ from others. A number of parts are defined as a batch and processed simultaneously with sharing a set up time. A batch can be formed of the parts with different type of item and the processing time of batch equals the longest processing time of parts in the batch. It is assumed that an excessive duration of processing the parts will not lead to any defect, but increase the operating cost. The completed part must simultaneously be delivered at common due date, d. The objective is to minimise total actual flowtime of parts through the shop. A solution procedure to solve the problem is proposed and numerical examples are shown.
Modification of Poly Lactid Acid (PLA)/Chitosan with cinnamon essential oil for antibacterial applications
Authors: Suryani S , Rihayat T , Nurhanifa N , Riskina S 
Published: May 2020

Abstract
The active packaging material used for the manufacture of food packaging that has antimicrobial properties. The purpose of this research is to inhibit the growth of microorganisms on food surfaces, to improve nutritional quality and to extend the shelf life of food and reduce the environmental impact of packaging. The preparation is done Cinnamon essential oil (CEO) is a natural antimicrobial being investigated for food packaging as a substitute for synthetic chemicals due to consumer concerns over food safety. In this study, lactic acid poly (PLA) and chitosan were successfully modified with essential oil (CEO) at concentrations (1.5%, 2%, 2.5%, and 3% v/v) that formed composite fibres with using a simple electrospinning method. The morphology of the composite fibres can be seen from PLA / CS-CEO-2.5 showing good stability of the CEO so that the antimicrobial activity is increased compared to other blends. PLA / CS-CEO fibre shows a high level of long-term inactivation against Escherichia coli and Staphylococcus aureus due to the CEO’s ongoing release, indicating that advanced PLA / CS-CEO fibres have great potential for active food packaging applications.
Combination of poly lactid acid zinc oxide nanocomposite for antimicrobial packaging application
Authors: Ridwan R , Rihayat T , Suryani S , Ismi A S , Nurhanifa N , Riskina S 
Published: May 2020

Abstract
Many food packages (plastic wrappers) today cannot be broken down by the environment. therefore, it is necessary to add natural substances that can make the food package decompose and be resistant to contamination with bacteria. Poly lactic acid (PLA) is one of the natural polymers produced by several bacteria that grow in crops rich in carbohydrates (such as sugar beets, corn and others). This research aims to insert ZnO nanoparticles and chitosan into a plastic layer of PLA (poly lactic acid) which can improve the antibacterial properties of the resulting packaging. The method used in making PLA-ZnO-chitosan Nano composite is the precipitation method and the heating method. PLA-ZnO Nano composites were obtained by varying ZnO nanoparticles 0.5% by weight, 2% by weight, and 3.5% by weight. The results obtained in SEM images show that nanoparticles are homogeneously distributed on the plastic surface. Antimicrobial tests show nanocomposites work effectively in deactivating E. coli and S. aureus. where it was found that E. coli was more susceptible to this type of nanocomposite, where there was a reduction of 3.4 logs to 3.5% ZnO loading in the PLA layer.
Voltage generation characteristics of an Axial Flux Permanent Magnet (AFPM) generator
Authors: Rusmana R , Melkias A A , Nurrohman N , Kastawan I M W 
Published: May 2020

Abstract
A specially designed low-speed generator was enveloped based on low-speed turbines. The axial flux permanent magnet (AFPM) generator type is chosen to meet these needs. The generator consists of a stator and a rotor. The distance between the stator and rotor was studied to determine the characteristics of the AFPM generator. Besides, the impact of rotational speed on the output voltage also considers - the stator armatures made of copper wire with a diameter of 0.2 mm. The number of turns of a winding was 200 turns, which produced a resistance of 100 ohms. The shape of the armatures adjusted to the shape of the magnet. The rotor discs occupied by 18 magnets arranged symmetrically. The size of the magnet was 50 mm long, 30 mm wide and 13 mm thick. The laboratory test conducted by placing the rotor ranging from 23 mm to 15 mm, with changes in the distance of 2 mm each, from the stator. From the measurement, the linear equation of output voltage versus the rpm curve obtained as well as the output voltage versus the stator-rotor distance equation. The results show that the increase of rpm and the closer the rotor-stator distance, the higher the output voltage.
Implementation of the use of AutoCAD applications in increasing basic competence in describing techniques in vocational education
Authors: Saputro B E , Supratno S 
Published: May 2020

Abstract
Technology helps a drafter speed up work completion, including CAD (Computer Aided Design) applications. Auto CAD which is an application (CAD software) is used to draw, design drawings, even analyse a design to realize a commercially viable product. This program has advantages and convenience to make images visually, accurately and precisely. The lecture strategy with the help of a computer is a lecture method via computer where, the user (User) can more easily & quickly understand & apply what information is learned through an attractive image display. The product design of a gear with a cycloide (Cycloide) gear profile is used as an instrument to realize student competencies in machine element courses. An evaluation of the previous material provided an initiative in the development of the module. The module development referred to uses the term 4-D or better known as (Four-D). The 4-D development model has 4 stages: defining, designing, developing, and disseminating. The final results of the development of CAD learning modules with the 4-D method received a very good response from students and lecturers of PTM Study Program STKIP Eleven April Sumedang.
Stress analysis in pedicle screw and bone interface by various contact models in scoliotic spine fixation
Authors: Rusli M , Dahlan H , Sahputra R E , Bur M 
Published: May 2020

Abstract
Scoliosis is a musculoskeletal condition that has an abnormal lateral spinal curvature as its main feature. By a level curvature condition, the scoliotic spine has to treat by surgery process to install an instrument or implant consists of pedicle screws, rods, and connectors in fixation of the spinal curvature. However, it is observed in many cases that several types of failure occur in the instrument and the bone - pedicle screw interface. One of the problems was related to screw loosening and pulled out from the spine. This paper observes and discusses the stress distribution numerically in the screws and bone interface in scoliotic spine fixation using finite element analysis. The contact interface is modeled variously by bonded contact and friction contact. It is found that in bonded connection between screws and bone generates lower maximum stress than friction contacts. The maximum stress is working in the screw and the stress distribution is more uniform along the contact surface. Therefore, the risk of pulling out the screws will be minimized. On the other hand, friction contact with low friction coefficients makes the stress distribution is concentrated in a specific region and increase the maximum stress in bone.
Chatter detection in turning process using sound signal and simple microphone
Authors: Huda F , Darman D , Rusli M 
Published: May 2020

Abstract
Chatter is a problem that frequently found in the area of a machining process, which brings down machining productivity and surface quality. Therefore, reliable and intense chatter detection methods are needed to maintain machining quality. In this study, turning chatter detection approach by using sound signals and a simple microphone is proposed to get an accurate, simple, and low-cost detection method. For that purpose, an experimental set-up which consists of an operating turning machine, simple microphone, and Personal Computer (PC) with sound card was arranged. The chatter in the turning process was stimulated by applying artificial wear to the cutting tool. The sound signal data from normal and with chatter turning process were then grabbed by a simple microphone and PC with a sound card. The sound signals were then evaluated by Fast Fourier Transform (FFT) and Wavelet Transform (WT) for normal and chatter conditions. Both conditions data were then compared to get the characteristic of the sound signal in chatter. It is found that signals in the frequency domain, time-frequency and spectrogram have a significant magnitude spike in chatter condition. The results demonstrated that the proposed method could conscientiously identify the chatter.
Cutting tool wear analysis using sound signal and simple microphone
Authors: Huda F , Karjuni K , Rusli M 
Published: May 2020

Abstract
Cutting tool is an important part of machining processes which in the operation frequently runs into wear. The wear cutting tool produces an imprecise product with low quality surface, may endanger machine tools by stimulating chatter. In this study, low cost and fast analysis of the wear of cutting tools in turning and drilling processes are proposed. For that purpose, the experimental set-up which consists of operating turning and drilling machine, simple microphone and Personal Computer (PC) with a sound card are set out. The wear of cutting tools are made by applying artificial wear. The sound data from normal and wear cutting tools of operating turning and drilling machines are recorded by using simple microphone and PC with a sound card. The obtained sound signals are then analyzed in the form of time and frequency domain, spectrogram by Wavelet Transform (WT). It is found that sound signals in time and frequency domain have a significant rise of amplitudes in wear conditions. The spectrograms exhibit the special contours which sign the existence of wear. The results demonstrate that the proposed method can analyze the cutting tool wear very well.
Performance of a residential air conditioning unit under constant outdoor air temperature and varied relative humidity
Authors: Setyawan A , Badarudin A 
Published: May 2020

Abstract
An experiment on the effect of the relative humidity variations of outdoor air on the performance of an air conditioning system under constant dry-bulb temperature has been performed. In this experiment, the outdoor air temperature was maintained at 35°C while the relative humidity was varied from 40% to 70%. As a result, the operating conditions were slightly changed. In general, the suction temperature decreases with the increase of relative humidity. On the other hand, the condensing temperature slightly increases with the increase of relative humidity. Other findings for the experiment are almost constant of cooling capacity, with a variation of only 1.2%. An important evidence is that the condenser capacity increases by 15.2% for the relative humidity variation from 40% to 70%.
Enhancing performance of wall mounted split air conditioner using capillary tube in a tube heat exchanger
Authors: Berman E T , Komaro M , Miftakhudin M , Mutaufiq M , Suherman A 
Published: May 2020

Abstract
The high cost of electricity rates has affected the demands of the public for the availability of energy-efficient air conditioning systems. This study aims to obtain data on improving performance of air conditioner using capillary tube in tube heat exchangers. Tests were carried out on a wall mounted split AC capacity of 9000 Btu/h which was modified using a heat exchanger with capillary tube in tube heat exchanger. The results showed that the installation of a capillary tube in tube heat exchanger on a wall mounted split AC resulted in an increase RE and COP of 13.2% and 14.9%, respectively. In addition, the room cooling time in the TiTHX capillary mode testing is shorter. So it has implications for lighter compression work and saves the power consumption required by AC.
Optimization of B-series propeller geometry dimension to improve traditional fishing ship performance
Authors: Mulyana D , Koeshardono F , Sudradjat A , Widiatmoko R Y 
Published: May 2020

Abstract
The fishing ship propulsion system will affect the performance of the ship and impact the fishermen’s income. A crucial factor is the level of efficiency produced by propellers mounted on fishing vessels. In B-series propellers, propeller efficiency can be optimized by varying the size of the geometric dimensions. This propeller optimization process can be done after the ship resistance value is known. In Cirebon waters, as in other regions in Indonesia, the selection of propellers by fishermen is still unclear. Most are only based on the availability of goods on the market, without looking at how big the actual ship resistance occurs. In this research, one of the fishing boats that will be built will be chosen to estimate the ships’ resistance. After that, by considering the engine used as its driving source, the geometry dimensions that can produce the highest efficiency are sought. Estimation of ship resistance is sought by the Holtrop method, and propeller optimization is carried out with the help of software. From the results of this study, the value of ship resistance commonly used by Cirebon waters fishermen is 2.608 kN at an operational speed of 7 knots. Optimized propeller design provides a 6 percent increase in efficiency compared to previously used propellers.