The performance of stability test using Bantak aggregate and AC50/70 as polymer on Marshall characteristic

This study aims to determine Marshall's characteristics using asphalt binder modified polymer AC 50/70 (Starbit E-55) using local Bantak material. The test method used is a hot mix asphalt (Hot Mix) with the Marshall method. The asphalt content used was 5% successively; 5.5%; 6%; 6.5%; and 7% consisting of 3 specimens for each variant. The research was carried out at the Material Laboratory of the Department of Civil Engineering and Planning, Faculty of Engineering, Yogyakarta State University. The results of the Marshall characteristic performance test at the Optimum Asphalt Level (KAO) 6.5% are as follows: Marshall stability mean value is 1197.6 kg, Density mean value is 2.34 gr/cc, the mean value of melt (Flow) is 3, 1 mm, the mean value of VIM (Void in Mix) was 4.83%, the mean value of VMA (Void in Mineral Aggregate) was 13.40%, the mean value of VFB (Void Filled Bitumen) was 60.61%, and the mean value of MQ (Marshall Quotient) 391.08 kg/mm.

Hybrid method integrating SQL-IF and Naïve Bayes for SQL injection attack avoidance

Web applications are the objects most targeted by attackers. The technique most often used to attack web applications is SQL injection. This attack is categorized as dangerous because it can be used to illegally retrieve, modify, delete data, and even take over databases and web applications. To prevent SQL injection attacks from being executed by the database, a system that can identify attack patterns and can learn to detect new patterns from various attack patterns that have occurred is required. This study aims to build a system that acts as a proxy to prevent SQL injection attacks using the Hybrid Method which is a combination of SQL Injection Free Secure (SQL-IF) and Naïve Bayes methods. Tests were carried out to determine the level of accuracy, the effect of constants (K) on SQL-IF, and the number of datasets on Naïve Bayes on the accuracy and efficiency (average load time) of web pages. The test results showed that the Hybrid Method can improve the accuracy of SQL injection attack prevention. Smaller K values and larger dataset will produce better accuracy. The Hybrid Method produces a longer average web page load time than using only the SQL-IF or Naïve Bayes methods.

Lean distribution to minimize waste of time in the stripping process at PT. Pelabuhan Indonesia IV Ambon Branch

Stripping process at PT. Port Indonesia IV (Persero) Ambon Branch plays a very important role for expeditions to receive goods from outside its area to meet market needs. However, in the process of distributing containers to stripping blocks, there is a delay in delivery thus it does not reach the target as a result of waste. Based on the data, it is identified that the total lead time of the stripping process is 3,670 minutes which has a non-value-added activity of 3,090 minutes. It is still found delay that causes the waste so that it needs improvement by minimizing the waste. The purpose of this study is to calculate the efficiency of identified wastes and the total activity of the initial time and time after improvement. Data analysis tools used lean distribution conducted by field observations, interviews, questionnaires, and documentation with data processing techniques in the form of big picture mapping, waste identification, value stream analysis tools (VALSAT), process activity mapping, fishbone diagrams, 5W+1H methods, as well as calculating the efficiency of the improvement time. The result of this study showed that there are four wastes of seven wastes identified namely waste of transportation, waste on unnecessary inventory, waste of defects, and waste of waiting time. Waste of waiting time is a critical waste with a percentage of 29.8% based on the results of questionnaires with the causative factors namely careless parking, not paying attention to stock/targets, limited places, indiscipline, and negligence. After the improvement by minimizing waste, the lead time is 1,550 minutes with a total efficiency of activities of 42%.

Simulation of school business process

School is an institution where people learn reading, writing, and learning to have good character. The school has a social interaction system in an organizational relationship. Every institution must have a business process to achieve its vision and mission. The business process has activities carried out to provide services or products. This study analyzes business process systems in schools by designing school business process simulation scenarios and then implementing the design of AnyLogic Software and it can contribute to optimizing the management of business processes within schools, where processes are more structured and systematic. The method used in this study is the Business Process Improvement (BPI) Method to eliminate errors and provide competitive benefits by improving business processes. In applying the BPI method, the results obtained are recommendations for improving school business processes: (1) Adding Buses to schools, (2) Adding School Cooperative Staff to transport goods, and (3) Adding Cashiers in School Cooperatives.

Scheduling design of Jakarta-Cikampek II elevated toll road project (P.186 – P.187)

The key to achieving effective and efficient development goals is by increasing the quality of construction management by collecting up-to-date data about the project's resources, mainly about productivity. In this research space, productivity will be discussed, including human resources and their management. The case study is the project of Jakarta-Cikampek II Elevated Toll Road. This project was a developing project to improve the capacity of the existing Jakarta-Cikampek toll road. This elevated structure will be built right in the area (median and side edge) of the existing toll road, making it interesting to discuss how the construction is carried out. Scheduling analysis in this study was carried out at points P.186 to P.187 of the construction project. The analysis includes identifying the productivity index of labor resources and equipment that has a major role in shaping the scheduling concept. The concept will be performed by determining a network diagram that will use the Critical Path Method (CPM) rule. The data used in this analysis are construction drawing, s-curve plan, worker data, weekly job plan, work method, and some interviews with worker and field project manager. These results obtained the large productivity of workers and equipment, and the duration required to complete the construction starting prom point P.186 to P.187 is 248 working days

Simulation of automatic fan with LM35 temperature sensor using ATMEGA8535 microcontroller in Proteus application

The human body actually has a temperature and always releases energy at any time, especially body heat. Humans always react when heat occurs either due to temperature or other things. When heat is generated from the temperature of the air, then humans usually prefer a solution to use a fan as a cooler and conditioner to eliminate the feeling of heat that is felt. But the fan that is often used sometimes makes us bother to turn it on or off. So that an automatic fan is made by utilizing a microcontroller-based temperature sensor equipped with a temperature sensor LM35, ATmega8535 and other circuits that are put together then run. The fan can work automatically with the aim that humans are made easier in the process of activating the fan without having to bother and more efficient in energy use because the fan is only needed if the temperature sensor detects the temperature that has been set. From the results of tests conducted on the simulation the system can work very well according to what has been made. The role of sensors, series, is very important in the success of this project.

Effect of cooling distance on DC-LSND treatment on weld defects and weld fractures of A-36 steel

Control of weld defects and weld fractures in the welding construction should be done to provide the quality assurance of the welding products and to provide a positive assessment of construction to meet technical and economic requirements. The objective of this study is to investigate the effect of the cooling distance on DC-LSND (dynamic controlled low stress no distortion) treatment on weld defects and weld fractures to obtain the best characteristic of the treatment. In this research, DC-LSND treatment was performed by cooling the both sides near weld line applied in welding process. The cooling media used cryogenic liquid nitrogen sprayed by nozzle. The nozzle was placed at a various distance behind the weld torch. Weld defect was investigated by radiograph test. Tensile strength was tested by servo pulser machine and weld fracture was examined by macro structure and SEM. Results showed that the DC-LSND treatment with a cooling nozzle that is too close to the weld torch has the potential to cause weld imperfections. Porosity and initial welding defect lead to the decrease in the tensile strength of the weld metal and the brittle fracture based on the fracture shape. SEM fractography shows that DC-LSND treatment tends to increase the number of inclusions that have an effect on increasing hardness.

Designing of english challenge mobile game application as the media of english language learning

English became the first foreign language that came to Indonesia in 1967. The human needs of English can already be seen through lots of official scientific works in English and its intense competitions globally. However, still, many people finds it difficult to learn English, for example, the difficulty in understanding tenses, differences between writing, reading and pronouncing. By relying on the latest features on smartphone, which on the mean time, smartphone is one of many gadgets that is the most practical to use in anywhere and anytime, plus, with gaming contents as the best multimedia entertainer application, learning English will be more interactive and easier to use. In this research, Construct 2 is used as The Developer App and Game Development Life Cycle (GDLC) method of Rido Ramadan and Yani Widyani’s version is used as The Development Method. The game system tested by using black box and by giving out Questionnaire for User Interface Satisfaction to 24 respondents, to test the system’s usability. It resulted 80,83% for the whole of the system, meaning that the whole system is quiet interesting in the respondents’s view. Then, the screen display gained 80,41%, this means that the screen display is very interesting and did not confuse the respondents. Technology and information game gained 75,41%, this means that the information contained in the game is quiet good, however, further development is needed. The introduction of the game’s system gained 71,63%, means that some of the system’s ability did not run effectively and needed further repairment and development. The last, usability and user interface gained 76,25%, this means that the game is quiet interactive to the respondents.

Characteristics of ASTM A36 steel plate corrosion rate due to bending treatment with angle, corrosion media, and corrosion time variations

Bending can cause stress to the workpiece, where the stress can cause a fine crack in the metal which can lead to corrosion. Corrosion that occurs can result in a decline in the quality of metals, especially in mechanical properties. This study aims to determine the characteristics of the corrosion rate of each bending angle. This study uses low carbon steel with ASTM A36 type plates, this type of steel is often used in ship production. This research is an experimental study using descriptive statistical methods, and 3x3 factorial Anava for testing hypotheses. From this research, the results obtained in the form of corrosion rate values, where the characteristics of the corrosion rate of steel plates with the lowest corrosion resistance are at 60o bending treatment, seawater media, and 48 hours with a corrosion rate of 2.005 mmpy. Corrosion rate characteristics with the best resistance are in the bending treatment of 120o, PDAM water media, and 24 hour time with a corrosion rate of 0.695 mmpy. Hypothesis test results state that there is a significant effect of variations in bending angle, corrosion media, and corrosion time on the value of the corrosion rate.

The design and feasibility test of drive-thru market prototype based on Wemos as the learning media of internet of things (IoT) application

This research aims at (1) developing a learning media for the internet of things (IoT) applications in the form of Wemos-based drive-thru market module which is appropriate for Interface Engineering Courses at Electrical Engineering Education, Faculty of Engineering, Universitas Negeri Yogyakarta; and (2) determining the feasibility of the developed learning media. The subject of the research was the 2015 Mechatronics Engineering Education students. The object of the research was the drive-thru market prototype. The research instrument was the questionnaire to obtain data on media feasibility. The proper research results were in the form of (1) the hardware namely the drive-thru market prototype and it's Android application software, (2) the proper function of the prototype and Android applications with the design, (3) the feasibility from the media experts with the percentage of 78% and 83 % respectively that can be categorized as Appropriate, and from the user obtained the percentage of 86.15% with the category of Very Appropriate.