bluuebunny/crossref_metadata_2025 huggingface dataset:
An Analysis of Students’ Learning Difficulties in Image Projection Subject
Authors: Komala Jati Afri , Pardjono
Published: November 2019

This study aimed to investigate the factors causing learning difficulties experienced by students in Image Projection subject and describe the level of their learning difficulties viewed from the factors of students, teachers, environment, facilities, and subject matters. This was a descriptive study employing a quantitative approach. The data were collected from 50 students of Grade X, Machining Engineering study program, Muhammadiyah 3 Vocational High School, Yogyakarta, through questionnaires and interviews. The findings showedthat the students’ learning difficultieswere caused by various factors, including the studentsthemselves(34.01), the teacher (29.44), environment (25.30), facilities (34.39), and subject matters (24.98). To overcome those constraints, some students (19.76) chose to join a tutorial.
Implementing A Module On Aluminium Casting Practices At A State Vocational High School SMKN 2 Wonosari
Authors: Burhan Amali Zulfahmi , Arianto Leman S.
Published: November 2019

This research was aimed at investigating the improvement of students’ learning achievements by applying the module on aluminium casting practices. This was an experiment study with a Pre-test Post-test Control Group design. The population was the tenth grade students (96) of Machining Engineering at a state vocational high school SMKN 2 Wonosari and the sample consisted of students in X MA and X MC. The data were collected using observations and tests which were then analyzed descriptively. The result shows that 14 students in the control group met the minimum criteria for completeness (score 75) while in the experiment group, there were 23 students reaching the score. The mean score of the experiment group was better than that of the control group (75>69). The average of the students’ learning achievement in the experiment group increased 31%, while the gain of the control group was only 18%.
Improving Learning Outcomes of Vocational High School Students through Application of Circular Motion Learning Media Using Microcontrollers
Authors: Rachman N F , Hidayat F S , Handhika J , Jamaludin  , Tamtomo Adi Wahyu
Published: November 2019

The purpose of this study was to determine the effect of application circular motion practicum media using microcontrollers-based toward the learning outcomes of students. The object of this research is the students of State Vocational High School and Private Vocational High Schools in Madiun. The research design was Nonequivalent control group pretest-posttest. Data collection technique used 5 questions of cognitive essays tests. Data analyzed using qualitative descriptive techniques. The findings found out that the application of circular motion learning media using microcontroller has a significant influence on improving the students’ cognitive learning outcomes.
Developing Computer-Based Professional Competency Test Items For Automotive Engineering Teachers Professional Education
Authors: Martubi  , Chaerul Yuswono Lilik , Sukaswanto
Published: November 2019

The objective of the study is to develop Computer-Based Professional Competency Test Items. This type of test items is very important for the successful performance of Teachers Professional Education, recalling the fact that the quality of Teachers Professional Education is determined by the Computer-Based National Test which dominant materials are related to Professional Competency. Then, the study was conducted by referring to the research and development model by Borg & Gall with simplification on several stages. After the study has been conducted, there are several findings that might be elaborated. First, the development of Computer-Based Professional Competency Test Items for the participants of Automotive Engineering Teachers Professional Education is conducted through several stages as follows: (a) planning (content, form and number of test items); (b) test items drafting; (c) computer program developing; (d) testing; and (e) evaluating. Second, based on the rational analysis the quality of the research and development results might be categorized as follows: (a) from the aspects of material there are 2 test items that have been incompatible for the Multiple Choice mode; (b) from the aspects of construction there are 5 test items that have been different formulation for the answers; and (c) from the aspects of language there is 1 test item that has incompatible standard for the appropriate Bahasa Indonesia. Third, the value of Difficulty Level might be described as follows: (a) 23 test items belong to “Easy” category; (b) 32 test items belong to “Moderate” category; and (c) 5 test items belong to “Difficult” category. It means that the ratio among the “Easy,” “Moderate,” and “Difficult” will be 38.301 : 53.301 : 8.401. Fourth, the value of Discriminant Capacity might be described as follows: (a) 2 test items belong to “Very Good” category; (b) 17 test items belong to “Good” category; (c) 13 test items belong to “Moderate” category; (d) 21 test items belong to “Poor” category; and (e) 7 test items belong to “Very Poor” category. It means that 28 test items (46.701) have not meet the requirement of a good test item. Fifth, the value of Distractor Effectiveness Distribution might be described as follows: (a) 3 test items have 1 ineffective distractor; (b) 15 items have 2 ineffective distractors; (c) 28 test items have 3 ineffective distractors; and (d) 14 test items have 4 ineffective distractors.
Developing The Standard Competencies For Vocational Teacher Candidates Of Mechanical Engineering
Authors: Rofiq Zainur , Surono Surono , Bruri Triyono Mochamad , Setiyo Hari Purwoko Bambang
Published: November 2019

This study aimed to: (1) obtain an overview of the current competency profiles of vocational teacher candidates of mechanical engineering, (2) gain an overview of the obstacles faced by vocational teachers of mechanical engineering in their competency completion, and (3) obtain the ideal formulation of the standard competencies for vocational teacher candidates of mechanical engineering. This research is of research and development (R&D) type. The sample was 32 vocational high school teachers of machining major and six relevant industrial practitioners from Yogyakarta Special Region. Data collection technique used questionnaires. Data analysis used descriptive statistical analysis techniques. Results of this study were: (1) the current competence of vocational teacher candidates of mechanical engineering was in the good category with a mean of 3.94; (2) there were seven obstacles faced by vocational teachers of mechanical engineering on their competencies completion, namely professionalism, motivation, facilities, workload, government policy, adaptability, and self-development; and (3) the ideal formulation of the standard competencies for vocational teacher candidates of mechanical engineering can generally be classified into pedagogical competence, competence in the field of expertise, managerial competence, personal competence, and social competence.
Vocational education as the answer of challenges for global competition
Authors: Nurmalasari R , Oktaviastuti B , Sutadji E
Published: November 2019

ASEAN Economic Community (AEC) was one of the opportunities and challenges for Indonesia in facing globalization era. The important thing on AEC was the quality of human resources. Qualified human resources were expected to produce skilled workers who were ready to compete with workers from other ASEAN countries. Vocational and training education was an appropriate alternative to improve Indonesia’s human resources. Vocational education was required to improve the competence of Indonesia’s young generation who will enter the world of work in line with technological developments and changes in the labor market. Vocational education was expected to answer the challenges of global competition. This was because vocational education has advantages such as intensive skill, skilled labor, ability to face the era of globalization, and vocational education has benefits for many parties.
Developing instrument for assessing student collaboration in vocational high schools
Authors: Firdausa AR , Istiyono E
Published: November 2019

Assessment of the student collaboration of Vocational High School (VHS) in practical learning does not yet have special instruments. This study aims to develop instruments on the assessment of student collaboration VHS. This study used the Research and Development theoretical research method which has the 7 steps of development, (1) conducting a theoretical study on indicators of student collaboration; (2) arranging blue print; (3) validating by expert; (4) testing the instrument; (5) analysing the data; (6) revising the instrument; (7) compile the final instrument. Instrument review was carried out by 9 expert. Based on the results by the expert it was found that all items were valid and could be carried out for testing. The instrument test was conducted on 211 student respondents at level X, XI, and XII VHS from various skill programs in several cities in Indonesia. The distribution of questionnaires was carried out by online using the Google form application. The student’s collaboration instrument was experienced three analyses. The results showed that there are 29 good items where showed the KMO value is 0.859, the Cronbach Alpha reliability value is 0.870, the total variance explained is 65, 553%, and the instrument indicator becomes 7 new indicators.
Perception of vocational education students on the utilization of blended learning models
Authors: Puspitasari EDT , Soeharto
Published: November 2019

The development of technology and information has an impact on the learning process in the world of education, especially vocational education. In this era learning is not only held in class, but can be anywhere. The role of the internet has made it easy to access learning materials needed by students. An effective and efficient vocational education learning solution is to apply the blended learning model. The purpose of this study was to determine the perceptions of vocational education students from various majors or concentrations on the use of the blended learning model. This study includes a type of quantitative research with a descriptive approach. Data collection techniques using questionnaires and data analysis techniques carried out by steps 1) collecting respondents’ data; 2) analyze the data by describing or describing the collected data; 3) presents in graphical form (visual). The results of this study show attention or interest if on average they get a response of 81.33% with the category “high”, for the level of relevance to get a response of 85.50% with “high” activities, while for student response literacy towards the blended learning model learning gets a score of 80.38%. For confidence, the response was 69.07% with the category “enough”. High interest is the starting point for the application of blended learning. If the initial perception has shown positive, then learning will be more focused to achieve the goal.
Minimize the competence gap between ferrous foundry small firms and vocational high school in Indonesia readiness industry 4.0
Authors: Saifudin A , Wijanarka BS
Published: November 2019

the purpose of this paper is to identify the Competence that should be taught in Vocational High School which still takes care of the skills needed for the future. The research method used is descriptive qualitative. To get the required Competence of metal Ferro casting industry from Vocational High School students through two sides. The first side is observation and interviewing in the ferrous foundry to get the required Competence. The next side is by way of interviews and observations at Vocational High School to know the difference Competence is taught. Competences that should be taught are provide material on the foundations of metal casting, pattern-making techniques and power points or Prezi, engineering drawings and AutoCAD, manual and modern casting technique, Solidwork and the solid cast, mold making techniques and core, and Ferro metal casting techniques with industry.
Occupational competence needs analysis of welder on medium-scaled car body industries in Indonesia
Authors: Putra AYW , Wijanarka B S
Published: November 2019

The purposes of this research are 1) Identify the duties and 2) tasks of welders in medium-scale welding industries. This research uses a descriptive qualitative method. The research objects are 4 welders and 3 supervisors/chief productions from two medium-scale car body industries in Magelang, Indonesia. The data collection techniques used are documentation, observation, and interview. The data analysis techniques used are descriptive analysis and DACUM research chart which are validated by an expert’s judgment. This research manages to identify (1) six kinds of duties (plan the job, machinery and equipment preparation, material welding, inspect welding results, fix welding results, maintain machinery and equipment) and (2) seventeen kind of tasks that are executed by welders in medium-scale car body welding industries, twenty three knowledge and skills, nine working attitudes that should be owned by a welder, and at least nineteen kind of machines and supporting equipment in which the operation should be mastered by a welder in medium-scale welding industries.
The Role Of Vocational Education In The Era Of Industrial Automation
Authors: Sudira Putu
Published: November 2019

In Industry 4.0 there is a production process with a quick reaction to changes in market demand, inventory requirements, and excellent service with very small errors. This happened because of the implementation of Cyber-Physical Productions Systems (CPPS). CPPS works to integrate computers that work as devices for Artificial Intelligence (AI), Augmented Reality (AR), Virtual Reality (VR), Internet of Thinks (IoT), Internet of Service (IoS), intelligent robots, 3D printers in production systems. In order for the role of vocational education to be more effective in supporting the development needs of industrial automation 4.0, it requires a frog leap in curriculum development, learning, program management through a multi and transdisciplinary approach across study programs. Vocational education is truly link and match with super large changes in industry 4.0.
Optimizing performance of compact crucible furnace by optimizing position of crucible pot
Authors: Soemowidagdo AL , Arifin A
Published: November 2019

Innovations has been conducting recently in order to obtain suitable crucible furnace for casting practice at vocational high school. This research is aimed at optimizing performance of compact crucible furnace by optimizing the crucible pot position. The crucible pot have diameter of 170 mm and height of 250 mm. The height of pot supporting are vary of 20, 40, 60, 80, and 100 mm. The furnace performance is determined by the rate of temperature rise to melt 3 kg of aluminium. Temperature changes measured by infrared thermometer. The result indicate that pot support of 60 mm gives optimum performance to compact crucible furnace. It is resulting temperature achievements of 600 °C in 35 minutes.
Evaluation of implementation of health and safety in industry and vocational school in Yogyakarta Special Region
Authors: Wijanarka BS , Sukardi Th. , Rahdiyanta D. , Ngadiyono Y.
Published: November 2019

The objectives of this study were: (1) to describe the application of occupational safety and health in the machinery industry in the Yogyakarta area, (2) describe the application of OSH in vocational schools in Yogyakarta and (3) evaluate how the application of Occupational Safety and Health (OSH) in the machinery industry if applied in the implementation of OSH in vocational schools. The research method used is descriptive qualitative research. Research subjects are PT. Mega Andalan Kalasan, PT. Yogya Presisi Tehnikatama Industri, CV. Karya Hidup Sentosa, SMK Negeri 2 Depok Sleman, SMK Negeri 2 Yogyakarta, and SMK Muhammadyah 3 Yogyakarta. Data collection used observation and interviews. The results of the study: (1) The machinery and manufacturing industry in the Yogyakarta area has carried out OSH aspects including occupational safety, occupational health, and OSH management in accordance with the OSH application rules for industry, (2) SMKs in the Yogyakarta area have not implemented all aspects of OSH implementation in accordance with industry standards. The application of occupational safety aspects is still lacking, the application of occupational health is still lacking, and management aspects have not been implemented, and (3) SMKs should implement OSH management in accordance with industry standards, especially OSH management, namely: (a) OSH education and training, (b) socialization of OSH in schools, and (c) provision of personal protective equipment, and (d) health services in schools.
Exhaust Gas Emission from Automotive Workshop Facilities of Vocational School in Yogyakarta
Authors: Arifin Zainal
Published: November 2019

Management of learning facilities and infrastructure is not only a learning arrangement, and physical facilities, but prepares classroom conditions and school environment in order to create comfort and an effective learning atmosphere. Therefore, schools and classes need to be managed properly, and create a supportive learning climate. One of the problems in the management of practical facilities is exhaust gas emission produce from practice facilities. The purpose of this study is to identify the load of emissions produced by vocational school practice facilities.

The approach of this research is quantitative research, with descriptive methods, and research techniques using surveys. The research population is a practice facility in the Automotive Engineering Workshop in 9 (nine) Vocational Schools in Yogyakarta.

The results showed that the exhaust gast emission potential from the Automotive Engineering Program in the city of Yogyakarta, based on data collected through surveys, can be calculated estimated fuel consumption per year and the amount of emissions from several emission factors according to applicable standards. Amount of emission: NOx 0.08134 (Ton / year), SOx 0.00077 (Ton / year), NMVOC 0.06539 (Ton / year), PM10 0.00349 (Ton / year), CO 2.73184 (Ton / year), and CO2 48.32946 (Ton / year ) Although the source of exhaust emissions from the workshop practice facilities of the Automotive Engineering Expertise in the city of Yogyakarta has a small emission value when in a single situation / condition, it can provide significant potential when accumulating or area, causing a negative impact on the health of both students and teachers that is around it.
Design Improvement of Energy-Saving and Eco-Friendly Car as Transportation Facility
Authors: Arifin Zainal , Sofyan Herminarto , Solikin Moch. , Haryana Kir
Published: November 2019

The increase of transportation facility needs raises a problems, especially pollution caused by motor vehicle exhaust that directly affects the decline of air function. Consequently, it is needed an effort to build alternative technologies and eco-friendly vehicles as transportation, in order to reduce the negative impact of exhaust emissions from fossil-fueled vehicles. This research was conducted to design and improve energy-saving and eco-friendly product that can be utilized as transportation. Accordingly, to improve the design of energy-saving and environmentally friendly vehicles, this research is conducted using research and development, for 5 years, starting in 2017 until 2021. Based on a survey towards 327 people that spread across major cities in Indonesia, the result reveals that the design of energy-saving and environmentally friendly vehicles required is a multi-purpose vehicle (multi-purpose vehicle / MPV). By considering the aspect of energy consumption and its impact on the environment, then the concept to improve is city car vehicle concept with 2 seats capacity plus baggage which is able to carry load of 60 kg. The selected vehicle specifications includes 2200 mm long dimension, 1800 mm width, 1700 mm height, 160 mm clearance ground, 1000 cc engine capacity, and 2 x 3000 W motor capacity.
Identification Of Fault Components In Diesel Engine Sounds On Train Using Neural Network
Authors: Winjaya Fathurozi , Darmawan Arief , Diah Mariana , Setyo Dhina , Sunaryo
Published: November 2019

The diesel engine damage is a typically found-problem in a train. One of the examples from such damage is the damage on components or known as fault components. Fault components occur because the engine does not attain its maximum performance due to the various causes starting from injector damage to injection pump damage. These damages have different sound characteristics. Based on the differences in sound characteristics, expert engineers might identify and categorize the type of damage within the diesel engine by using condenser microphone installed within 1 meter from the source of the engine sound with HPF and FFT (Fast Fourier Transform). The three sources of sound have different frequency. The normal diesel engine has dominant frequency under 1 kHz while the diesel engine sound with injector damage has the dominant frequency under 2 kHz and the diesel engine sound with injection pump damage has dominant frequency above 2 kHz. The data are gathered and processed using Neural Network with RMSE (Root Mean Square Error) 0.001.
Analysis Of Soil Improvement Using Bamboo Net-System On Railway
Authors: Wahyu Erlangga Aditya , Jamaludin  , Handoko  , Priyanto Sapto , Cosmalinda Laynardo Devi
Published: November 2019

Soft soil conditions and shallow groundwater positions are found in the project process of the Railway Double Track, so it may reduce the carrying capacity of the soil and cause a decrease in soil if the soil is given a load. Based on the sondir test for soil with a value of qc> 10 kg / cm2 at a depth of below 20 m, bamboo net may use as soil improvement as a more environmentally friendly alternative. Bamboo net-systemhas a diameter of 10 cm and a length of 5 meters, and the distance between the poles is 60 cm = 6 x 10 (6D). The total of bamboo was 8 stems. Soil improvement using bamboo net of 10 cm in diameter and 5 meters length, with a distance between bamboo 60 cm, then it obtained analysis results of the carrying capacity of 738.8 kN / m2. The train voltage and landfill are 249, 295 kN / m2 <carrying capacity of the group pole is 738.8 kN / m2. Based on the results of the density test of Sand Cone obtained a degree of density of 96.5%.
The Effect Of Material Exposure Variations On Energy Absorption Capability And pattern Of Deformation Material Of Crash Box Of Three Segments
Authors: Artha Wirawan Willy , Zulkarnain Akbar , Boedi Wahjono Hari , Jamaludin  , Tyas Damayanti Ajeng
Published: November 2019

Abstrak

Crash box is part of the supportingcomponents on vehicle safety, especially cars. The crash boxis designed to reduce the occurrence of driver’s injuries due to collisions. This study aimed to determine the capability of energy absorption and deformation patterns in the crash box using a three-segment circle cross-section. The research method was quasi-experimental with a simulation using Finite Element Method software. The crash box simulation carried out with a 200 kg impactor on a speed of 7.67 m/s. The independent variable in this study is the material exposure variation in the crash box using steel-aluminum-steel and aluminum-steel-aluminum. The dependent variables were energy absorption, force reaction and deformation patterns occurring in the crash box. Based on the simulation results, the values ofenergy absorption was 82452 J and force reaction was 1127700 N in the crash box of steel-aluminum-steel material. Meanwhile, the crash box material of aluminum-steel-aluminum has an energy absorption value of 236210 N, force reaction of 12432 J and a better and more stable on deformation pattern.
Reliability and usability analysis of the implementation ERP in host to host payment system: A case study
Authors: Fitriani  , Witjaksono R Wahjoe , Saputra Muhardi
Published: November 2019

The telecommunication industry in Indonesia built a system of direct payment transactions to vendors. The level of quality that exists in the host to host the payment system is currently the goal of the research. Identifying the quality system is important in the quality assurance process to prove the system is fit to apply in industry. Quality system measurement can use the ISO 9126 model. This model has measurement standards that are valid and reliable in measuring quality system. The variables analyzed in this study are the reliability and usability of the system. The reliability system is often interpreted as the resilience of a system or component to function properly if operated in certain environmental conditions and supported by the usability of the system. The usefulness of the system is the ability of software to be understood, studied, used, and appealed to users. This variable can be a measure of quality system measurement. The results of this study are recommendations based on the lowest scores obtained from the measurement test. The lowest value in this study is system recovery which includes system reliability. The proposed recommendation is to replace the Oracle 12 database with SAP HANA because it has a faster response time so that it can support the development of the company going forward.
Implementation of security system on humanitarian organization: case study of dompet dhuafa foundation
Authors: Kaburuan Emil R. , Lindawati ASL
Published: November 2019

System security management can increase public confidence in the information produced and processed by a company and increase the quality assurance of information. To reduce the threat to the company’s business process information system, there must be an assessment of information system security management needed to support the company’s business processes, especially in the humanitarian foundation, in this case, is “Dompet Dhuafa Foundation.” In the use of information systems, security risks will arise, which will hurt the institution. In order to reduce the negative impact, it is necessary to handle the security risks of the system. ISO / IEC 27001 offers a set of specifications, a code of ethics, and best practice guidelines to ensure the management of IT (Information Technology) services. ISO 27001 is a standard that is often used to determine the need to implement information system security. With the application of ISO / IEC 27001, It can protect aspects of information security, namely confidentiality, integrity, and availability.
Decision support system using data warehouse for retail system
Authors: Girsang Abba Suganda , Arisandi Geri , Elysisa Calista , Michelle  , Saragih Melva Hermayanty
Published: November 2019

CMK company is a retail company that sell and distributes miniature vehicle items to small stores. CMK has several branches in various countries that use for operational and storage warehouse. This company faces the problem for analysing sales to decide the useful strategy since this company only uses Online Transaction Processing (OLTP) database. This study implements Online Analysis Processing (OLAP) database and data warehouse to provide useful information for this company by using the nine-step method designed by Kimball & Ross. The data will be performed into dashboard to make easier for CMK Company to analyze data. Furthermore, many useful information can be provided in short and efficient time.
Application for determining the modality preference of student learning
Authors: Kurniawan Yogiek Indra , Rahmawati Anggit , Chasanah Nur , Hanifa Aini
Published: November 2019

Learning modality is the sensory sensitivity of the individual when receiving, storing, and conveying information. Each individual has a personal character and varied sex that influences the type of learning modality. Learning modality consists of four types of visual, auditorial, read-write and kinesthetic (VARK). To measure students’ learning modalities preference was used VARK Questionnaire 7.1 which contained 16 standard questions through paper media. Paper media is less efficient and effective both in the dissemination and analysis of questionnaires results based on study program and sex, because it made the application of determinants of student-based learning modalities modality using Research and Development (R&D) method with PHP programming language and MySQL database, this application features a percentage analysis of students’ learning modalities preference based on study program and sex. This application aims to facilitate the students to know the analysis of modal preference results in accordance with the rules of the limit of the difference of points specified and can display the percentage of overall learning modalities based on sex in accordance with the study program. Based on the results of application acceptance test by students of Faculty of Communication and Informatics Muhammadiyah University of Surakarta known as many as 87% of respondents agreed that the application determinants of learning modalities preference can present information and determine the preferences of learning modalities, easy to use and looks interesting.
Influence of physical and network security on company efficiency using SEM
Authors: Bernanda D. Y. , Wang Gunawan , Kaburuan E. R. , Jayadi R.
Published: November 2019

A computer network is a system consisting of two or more computers that are interconnected and designed to share resources, communicate, and access information. Nowadays, IT security plays an important role in a company. The purpose of this study is to get an overview of the performance of IT security and network security to improve the efficiency of company. Implementing IT security and network security, however, poses major challenges to many organizations. To ensure IT and network security, the article applies SEM method to analyze its influence in performance efficiency. The research results show that physical security is more influential on enterprise efficiency than network security. The outcome of the article is expected to deliver reference for companies to apply appropriate physical and network security.
Implementation of direction control on self-driving car prototype
Authors: Fauziah N E , Wibawa I P D , Ekaputri C
Published: November 2019

A Self-driving car needs sturdy steering system. Therefore designing direction control must be precise to the track. This direction control will help the car know the current position and direct it to the right angle. Directional control results in a turning angle. Turning angle is obtained from the tangent value between two Region of Interest (ROI) in the frame of the camera captured. The turning angle obtained is conditioned to match the angle of the servo motor as the front actuator of the car prototype. The results of this research are the turning angles that are read in the Python program on a straight lane have an average of 90.4198 with an average error of 1,086, the right turning lane has an average turning angle of 99.5502, 112.96973 and 117.0711 with an average error 3.03727, 3.62493 and 3.0636296, the left turn lane 58.7540333, 71.218 and 80.1277667 with an average error of 1.61674, 1.88093 and 1.48696 so that they can direct the car prototype in accordance with the sharpness of the bend in the lane.
Comparison of discrete cosine transform and dual-tree complex wavelet transform based on arithmetic coding in medical image compression
Authors: Novamizanti Ledya , Prasasti Anggunmeka Luhur , Noor Kiranda Ilham Faezar
Published: November 2019

Medical image contains very important information in the medical world used to diagnose diseases by doctors. Storage for storing medical imagery requires large storage media. The difficulty of sending and storing files, hence the process of compression image that can shrink the size of medical image. This research uses the Discrete Cosine Transform and Dual-Tree Complex Wavelet Transform-based Arithmetic Coding. DCT is used in the process of compression of imagery files using the cosine value approach. In DCT, there is a quantization process that causes image quality to decline, as it eliminates some information on imagery. DTCWT uses 2 trees, where tree 1 is for real value and tree 2 for imaginary value. Arithmetic Coding is one of entropy encoding that uses the range and probability values in the calculation. The value of decoding results in Arithmetic Coding has the same value as the original image. DCT produce a higher compression ratio than DTCWT, while DTCWT get higher PSNR than DCT.
Discrete Wavelet Transform on static hand gesture recognition
Authors: Candrasari Erizka Banuwati , Novamizanti Ledya , Aulia Suci
Published: November 2019

The technology in present-day is very useful for human-physical recognition and the hand gesture recognition is one of them. Nevertheless, that technology still had various weakness, for example in the image brightness, contrast, recognition time, and accuracy rate. The objective of this paper was to construct hand gesture recognition system using RGB images. Pre-processing is wrought by resizing the image, separate the hand area, and pick the specific layer. This experiment used the YCbCr because its derived directly from RGB and had a higher contrast compared to other layers. The feature value was gathered from feature extraction on Discrete Wavelet Transform (DWT) using Low-Low sub-band and 2nd level decomposition. The current sub-band had smoothest contours in comparison with other sub-band. The final process was gesture classification using Hidden Markov Models (HMM) and K-Nearest Neighbor (KNN). The amount of training and testing data used were 150 and 100 images respectively, divided into five gestures with accuracy using HMM and KNN consecutively was 58% and 100%. The research novelty was that the classification impacted positively on accuracy level.
Tea leaf maturity levels based on ycbcr color space and clustering centroid
Authors: Wicaksono Bagaskara Aji , Novamizanti Ledya , Ibrahim Nur
Published: November 2019

Technology develops very rapidly in all areas. Smart Farming 4.0 is a farming management concept that uses modern technology to increase quantity and quality. The picking of tea leaves during this time the farmer is only based on the quotes from the planting block. If the block is already arriving, then the block is taken in a thorough plucking. However, the picking time can be erratic due to weather factors. The design of the tea leaf maturity level identification system based on the digital image processing of tea leaves. The leaf image of the tea is then processed on a system that begins with segmentation preprocessing, the image that has been uniform then carried out the extraction of images transformed into the color features of YCbCr. After obtaining the luma and chroma values, the classification using Centroid is based on statistical characteristics. Then the extraction and classifying data is a system database that will then be used during the testing process. The total data of Peko tea leaves (P + 2) is used as much as 90 training images and 90 test images. The maturity classification of tea leaves uses a Centroid Clustering method with centroid 10 based on YCbCr color space and a minimum statistical feature, maximum, and variances get an accuracy value of 80% and computation time of 2.80 seconds.
Development of non-destructive mango assessment using Handheld Spectroscopy and Machine Learning Regression
Authors: Abdullah Al-Sanabani Dheya Galal , Solihin Mahmud Iwan , Pui Liew Phing , Astuti Winda , Ang Chun Kit , Hong Lim Wei
Published: November 2019

Quality determines the shelf-life and selling prices of fresh mango, and therefore quality observation and control of fresh mango are of utmost significance in the processing and management of its supply chain. Mango fruit (mangifera indica) quality methods are mostly destructive in nature. Different mechanical, electromagnetic and non-destructive methods are increasingly important nowadays because of the ease of operation, speed, and reliability of the process. This project aims to develop a non-destructive assessment of mango quality using handheld micro NIR (near-infrared) spectroscopic device. NIR spectra data and Brix levels, which indicate the sugar content of the plant, i.e. indicating the sweetness of the mango, were collected from three different types of Mango (Chokanan, Rainbow, and Kai Te), resulting 80 samples (i.e. 60 samples for training and 20 samples for testing) in this project. NIR spectra can be converted mathematically to obtain quantitative information of chemical and physical nature by multivariate calibration. The spectra data is pre-processed using Gaussian smoothing and extended multiplicative signal correction (EMSC) for the elimination of uncontrollable path length or scattering effects. These samples were then used to develop a predictive model using both Support Vector Machine (SVM) regression and Partial Least Squares regression (PLS) methods. The coefficient of determination (R2) obtained from SVM for training/calibration and testing dataset are 0.96 and 0.95 respectively. Meanwhile, the coefficient of determination (R2) obtained from PLS for calibration/training and testing dataset are 0.89 and 0.86 respectively. The results obtained from this project indicate that the handheld NIR has potential use for non-destructive assessment of mango fruits quality.
The effect of axial distance on dual rotor wind turbine’s performance
Authors: Nugroho Setyo , Diana Lohdy , Ariyanti Devi Purnama
Published: November 2019

Dual-rotor wind turbine (DRWT) is the development of wind turbine design with the addition of rotors placed on the same shaft. The addition of rotors causes the turbine to improve its performance. Experimental research was conducted to determine the performance that can be achieved by the DRWT type using the wind tunnel module. The test was carried out on three variations of the axial distance ratio of 0.08; 0.12; and 0.16. Comparing with a singlerotor wind turbine (SRWT), the DRWT type gives better performance. The DRWT type can rotate at a lower tip speed ratio than SRWT type. The power generated by the DRWT type is increasing up to 100% at tip speed ratio of 0.08 in all axial distance ratio while SRWT type can not rotate at tip speed ratio of 0.8. The DRWT type with a ratio of 0.12 is able to reach the highest coefficient of power which is 0.35 at tip speed ratio of 1.2. There was an increment of 53.7% in mechanical power from the SRWT type under the same conditions. Furthermore, the numerical method was used to know the flow phenomenon in the two rotors. The wake flow behind the first rotor causes backflow that give a loss to DRWT’s performance but still has enough energy that can be extracted by the second rotor and converted to mechanical power. Greater energy conversion will reduce wasted wind energy.
Proposal and operation characteristics of novel consequentpole permanent magnet motor
Authors: Noguchi Toshihiko , Murakami Kazuhiro , Hattor Akihisa , Kaneko Yoichi
Published: November 2019

A novel consequent-pole permanent magnet (PM) motor is proposed in the paper, which has an image pole pair for every pole pair of N and S. The three-phase synchronous impedances of the motor are balanced owing to the rotor configuration. In addition, it is possible to carry out field weakening with less d-axis current, which leads to a highly efficient operation in a high-speed range. This paper describes a basic principle and its operation characteristics of the newly proposed consequent-pole PM motor.
Surface finish machining optimization for 3D print
Authors: Herianto  , Setyadarma Pulung Bayu , Mastrisiswadi Hasan
Published: November 2019

The machining process has been conducted to get better surface results of a 3D print product. However, until now, there has been no optimization of parameters for the procedure. This study aims to obtain the optimal level of surface roughness in the machining process. A total of 27 experiments with the full factorial method were conducted (3 levels for three parameters). In this study, parameters to obtain surface roughness on the x and y-axes are different. On the x-axis, optimal surface roughness is achieved with 40 m / minute cutting speed parameters, 400 mm / minute feed rate, and 0.4 mm depth of cut. Meanwhile, on the y-axis, optimal surface roughness is obtained with 80 m / minute cutting speed parameters, 250 mm / minute feed rate, and 0.4 mm depth of cut.
Slip surface identification based on engineering properties analysis of weathering breccia at landslide occured in mount pawinihan, central java, indonesia
Authors: Permanajati I , Zakaria Z , Hadian M S D , Anwar H Z , Iswahyudi Sachrul
Published: November 2019

Landslide mitigation may be performed in various methods, such as by identifying the weathering degree in order to determine the position of slip surface. Slip surface is imaginary plane beneath surface dividing the moving part of slope mass with the rest, In short, it may also be defined as the weakest zone where the landslide may occur. Therefore, slip surface is the main object of this research which result may be used as a reference for further mitigation step. This research is conducted in the landslide case of Mount Pawinihan, Banjarnegara. The research is conducted by identifying the weathering degree of heterogenic material based on the British Standard EN ISO 14689-1. Engineering properties sampling was conducted after identification of weathering zone and use systematic sampling base on zone of weathering. The research result shows that the landslide soil mass under study may be divided into four weathering zones exposing on surface, while the position of slip surface may be identified in the weathering zone 3 (moderately weathered). This zone is a boundary of rock and soil condition.
A new development of the clove harvest safety tool for farmers
Authors: Soewardi H , Sujono R
Published: November 2019

Clove harvest safety tool is a tool to assist the clove farmers to move at high altitudes while harvesting cloves. In addition to being a vital tool for user safety, it helps farmers ease the clove harvest activities. Currently, many users are complaining about the safety of the existing clove harvest tool available in the market. This indicates the shortcomings in the existing tool design. Some of these complaints include difficulty to use, less convenient shape, and the expensive price in the market. These shortcomings have made users reluctant to use the safety tool while moving at an altitude of clove trees. The purpose of this study is to develop a new design of safety tools for clove farmers using the User-Centered Design as a concept to determine the design parameters of safety tools. The survey was conducted to identify the criteria and the use of statistical analysis to test hypotheses developed. This research results in the design parameters of safety tools that can represent the user demand as well as the farmers’ safety and activity. These criteria include strong design, durability, flexibility, multifunctionality and comfort.
Supplier selection of recycled plastic materials using best worst and TOPSIS method
Authors: Sulistyoningarum Rahma , Rosyidi Cucuk Nur , Rochman Taufiq
Published: November 2019

Supplier selection problem is one of the most important business activities related to sustainable development because it has significant effect on product quality and quantity and sustainability issues. PT Wonorejo Makmur Abadi is a plastic manufacturing company that produces plastic mats in many various brands and sizes. The raw materials used are recycled Polypropylene (PP) type of plastic raw materials to reduce mat production costs. There are several criteria that must be considered in determining suppliers including price, delivery, capability, and flexibility. The company must be careful in making decisions in supplier selection because there are several criteria that must be considered simultaneously. Therefore, in this paper, a decision-making tool is provided to solve the sustainable supplier selection in multi-item and multi-supplier environment. At first, one of the efficient Multiple Criteria Decision Making (MCDM) approaches called Best Worst Method (BWM) is used to determine the weight of each criterion, where the weight will be used in the evaluation of each supplier to select the most appropriate supplier using the Technique For Reference Orders By Similarity To Ideal Solution (TOPSIS) method. The results of this research can help managers in this plastic industry to deal with the sustainable supplier selection problem. Furthermore, the presented approach in this research can assist managers of other industries to select and evaluate their suppliers.
Implementing PPM framework to customer’s switching behaviour in dual-channel service supply chain
Authors: Widodo E , Palullungan D , Syairudin B
Published: November 2019

Dual-Channel Supply Chain (in short DCSC) is a business structure that integrates offline channel and online channels in distributing their products. In DCSC, a consumer may switch easily from one channel to another which can make a conflict between both channels because they have the same potential consumer. This study aims to examine the factors that cause consumers to switch shopping channels in the DCSC structure. Push-Pull-Mooring (PPM) is applied to investigate consumer channel switching behaviour that is implemented in a service company. Push variable includes information searching behaviour, perceived service quality, satisfaction, and perceived price. The pull variable includes switching cost, attitude toward switching, subjective norm. Additionally, mooring variable comprises of alternative attractiveness and responsiveness. The findings indicate that all three variables have a significant effect on switching intention. However, neither of mooring factor on the relationship between push and switching intention nor between pull and switching intention show moderating effects. Partial Least Square-Structural Equation Modelling (PLS-SEM) is applied to analyse survey data from 250 respondents. The result of the interrelationship among variables could be potentially applied in determining operational and tactical strategies to anticipate the volatilities in consumer behaviours.
Analysis of the influence of 5S work implementation culture on employee performance
Authors: Azzam Abdullah’ , Indrawati Sri , Saleh Chairul , Murti Kariza dan Bella
Published: November 2019

Employee performance is a determining factor in achieving company goals. One of the factors that influence employee performance is the work culture in the company. This research focused on the application of 5S work culture (Seiri, Seiton, Seiso, Seiketsu Shitsuke) and its influence on employee performance. The purpose of this study is to determine the effect of the application of 5S work culture on employee performance. The method used is a survey with SmartPLS 3.0. The survey was conducted in the service industry, especially hospitals that have applied 5S work culture. The questionnaire was distributed to employees in the industry. The analysis carried out is (1) Test the validity of the questionnaire (2) Test the outer and inner models (3) Test the hypothesis. The results obtained from this study are from the five hypotheses there are three variables that have a significant effect on employee performance including seiso, seiketsu, and shitsuke.