On The Implementation of ZFS (Zettabyte File System) Storage System

Digital data storage is very critical in computer systems. Storage devices used to store data may at any time suffer from damage caused by its lifetime, resource failure or factory defects. Such damage may lead to loss of important data. The risk of data loss in the event of device damage can be minimized by building a storage system that supports redundancy. The design of storage based on ZFS (Zettabyte File System) aims at building a storage system that supports redundancy and data integrity without requiring additional RAID controllers. When the system fails on one of its hard drive, the stored data remains secure and data integrity is kept assured. In addition to providing redundancy, the ZFS-based storage system also supports data compression for savings on storage space. The results show that the ZFS with LZ4 compression has the highest read and write speed. For real benchmark, there is no significant difference in reading speed for a variety of different variables, whereas a significant increase in speed occurs when writing compressible files on the ZFS system with compression configuration

On Implementing Wireless Smart Egg-Laying Hens Coop Control System

Egg-laying hens are a type of chicken that are articularly vulnerable to the risk of stress impacting on reducing the amount of egg production. Proper feeding schedule and coop temperature are two important factors in reducing such a risk. A chicken farm usually has many coops and scattered over several places requiring a lot of labors for maintenance. Advances in science and technology, especially in computer and embedded systems offer various solutions to address such an issue by automating the coops of egg-laying hens, so that labors can be greatly reduced. This paper proposed a remote automation system that employs Arduino Mega 2560 board as the central control system, equipped with a Wi-Fi module ESP8266 for remote accessibility, an electromechanical relay for controlling heating bulbs on and off, servo motor as the actuator for food container’s lid. The system uses DHT11 sensor to read room temperature and HC-SR04 sensor to read distance that relates to the food availability in coops. The result of this research is the system capable of automating the coops that can be remotely controlled through the Blynk application on an Android device. Error measured from this system is ±2C in temperature readings and 0 cm in reading distance. The actuator of food container’s lid test shows a considerably linear result between open time and the amount of food being released

Rancang Bangun Alat Penerjemah American Sign Language (ASL) dengan Sensor Flex dan MPU- 6050 Berbasis Mikrokontroler ATmega2560

Deaf or hard-of-hearing people have been using The American Sign Language (ASL) to communicate with others. Unfortunately, most of the people having normal hearing do not learn such a sign language; therefore, they do not understand persons with such disability. However, the rapid development of science and technology can facilitate people to translate body or part of the body formation more easily. This research is preceded with literature study surveying the need of sensors embedded in a glove. This research employs five flex sensors as well as accelerator and gyroscope to recognize ASL language having similar fingers formation. An Arduino Mega 2560 board as the central controller is employed to read the flex sensors' output and process the information. With 1Sheeld module, the output of the interpreter is presented on a smartphone both in text and voice. The result of this research is a flex glove system capable of translating the ASL from the hand formation that can be seen and be heard. Limitations were found when translating sign for letter N and M as the accuracy reached only 60%; therefore, the total performance of this system to recognize letter A to Z is 96.9%

Performance Comparisons of Web Server Load Balancing Algorithms on HAProxy and Heartbeat

Popular websites such as Google and Facebook are accessed by an extremely large clients and providing such clients only with a single web server is absolutely insufficient. To support service availability, two or more servers are required. This, however, needs a load balancing system. A load balancing server receives web traffic and distributes the requests to such multiple servers. Load balancing can be implemented with special hardware, software or a combination of both. The purpose of this research is to develop a load balancing system with HAProxy as a software-based load balancer and Heartbeat as failover software. The research also provides comparisons of the performance of several balancing algorithms on the system. The results show that without a load balancer, the load cannot equally be distributed. The system average failover time when an active server down is 10ms. The Leastconn algorithm, in general, outperformed the Round-Robin and Source algorithms in terms of connection rate, response time, throughput, and failed connection

Physicochemical and sensory characteristics of reduced sugar starfruit juice

The objective of this research was to study the physicochemical and sensory characteristics of reduced sugar starfruit juice. Cloudy starfruit juice produced by juicing of the edible part of starfruit, then the obtained filtrate was formulated with citric acid, Na-CMC and different ratio of cane sugar and sorbitol i.e. 10.0%:0.0%, 7.5%:2.5%, 5.0%:5.0%, 2.5%:5.0% and 0.0%:10.0% (% b/v). Physicochemical characteristics of the starfruit juice were total soluble solids in a range of 9.20 and 11.90%, the viscosity of 8.27 and 8.65 cP, pH of 3.56 and 3.63; and titratable acidity of 0.29 and 0.31%. Those cane sugar and sorbitol ratios affected significantly only on the total soluble solids. Based on the sensory evaluation, starfruit juice with cane sugar and sorbitol ratio of 7.50%:2.50% had the highest total preference scores of color, appearance, and taste. Colloidal stability of the starfruit juices during 10 days storage was in a range of 86.26% and 88.18%

Comparison of Bus Driving Control Based on Working Shift Hour and Impact on Bus Fuel Consumption

This study is aimed to investigate and compare how the work schedule of bus drivers in urban areas can have impact on bus drivers' control on speed and acceleration. This study also assesses the influence of bus driving behavior on fuel consumption. The work schedule assessed in this research is morning shift (6.00 am to 3.00 pm), afternoon shift (3.00 pm to midnight) and direct shift (6.00 am to midnight). The result from this study indicated that for all driving shifts, drivers spent more than 70% of their driving time for accelerating and braking. Drivers were also significantly driving faster and applying sharper acceleration when accelerating and braking during morning shift. The variation of bus driving behavior between different working shift hours were found to influence bus fuel consumption significantly

Comparison of Bus Driving Control Based on Working Shift Hour and Impact on Bus Fuel Consumption

This study is aimed to investigate and compare how the work schedule of bus drivers in urban areas can have impact on bus drivers' control on speed and acceleration. This study also assesses the influence of bus driving behavior on fuel consumption. The work schedule assessed in this research is morning shift (6.00 am to 3.00 pm), afternoon shift (3.00 pm to midnight) and direct shift (6.00 am to midnight). The result from this study indicated that for all driving shifts, drivers spent more than 70% of their driving time for accelerating and braking. Drivers were also significantly driving faster and applying sharper acceleration when accelerating and braking during morning shift. The variation of bus driving behavior between different working shift hours were found to influence bus fuel consumption significantly