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The utilization of substrate integrated waveguide (SIW) structure has penetrated into numerous applications for radio frequency devices. This paper discusses the development of narrowband bandpass filter (BPF) made of SIW structure for 5 GHz band wireless communication application. The proposed filter is designed on a Duroid 5880 dielectric substrate with the thickness of 1.575 mm and the total dimension of 36.5 mm (length) by 19 mm (width). The characterization is conducted by simulation software to investigate and analyze the effect of different parameters of SIW BPF to the output response. Meanwhile, parametric studies as part of characterization process are applied upon the proposed filter to obtain the optimum design of filter architecture. The results of characterization show that the proposed narrowband SIW BPF with the input/output impedances of 50 Ω has the bandwidth characteristic of 84 MHz in the frequency range of 5.827 GHz to 5.911 GHz with a good frequency selectivity suitable for the desired application.

In this paper, design and realization of tunable multi-band microstrip antenna based on artificial magnetic conductor (AMC) is presented. The involvement of AMC structure on the design of microstrip antenna makes the dimension of antenna to be smaller, hence it is easy to use for portable communication devices. The tunable frequency response of proposed microstrip antenna can be achieved by incorporating external elements, namely varactor diode. Here, the varactor diodes of STMD3001 type are used with the reverse DC bias voltage of 0V, 3V, and 10V. The proposed multi-band microstrip antenna is design using two layers of 1.6mm thick FR4 epoxy dielectric substrate. There is a square patch on the top side of the first layer and 4 identical square patches arranged in a 2×2 array on the top side of the second layer. The results show that the proposed AMC-based microstrip antenna could produce the tunable frequency response in the frequency range of 1.575GHz to 2.75GHz along with the variation of reverse DC bias voltage.

Based on data from the Bandung City Fire and Disaster Management Office in 2019, there were 271 fire cases with 89 deaths, including 106 residential fires. This system integrated multi-sensor component such as MQ-2 for smoke detection, KY-06 for flame detection, DHT-11 for temperature and humidity detection, TGS-2610 for gas detection, and ESP 8266 as Wi-Fi communication module. Each of the sensor performed as a fast response system to the fire hazard and case of fire. Based on the simulation results, this system can provide room temperature and humidity information in real-time, automatically open the LPG gas regulator when there is a gas leak by rotating the motor servo at 180°, automatically turn on the exhaust fan when smoke is detected, notifying user on Blynk application when the oddity detected, monitoring the room situation through an IP camera to prevent a false alarm.

The organization of lectures in the classroom requires a good arrangement so that available resources can be used efficiently. This paper describes the internet of things application for controlling classroom access according to the schedule. The system integrating the ID management system, the system configuration of classroom equipment, the dashboard monitoring system for classroom equipment and Academic System Information for scheduling. The system designed to prolong the lifetime of electronic equipment in the classroom and make electricity consumption more efficient as well as efforts for maintenance. In this system, RFID which is currently used as an identity on electronic attendance can also be used to access the classroom equipment. Sensors are also used to count the number of students who enter the classroom to control the temperature. Furthermore, it can record the student attendance. Raspberry Pi is used as a central controller device for classroom equipment and communicates with a central classroom information system

The purpose of this prototype is to develop a stator winding mechanism with a helical method, to reduce the electromagnetic force and decrease stator winding temperature rise. The prototype is divided into mechanical systems using a slider-crank mechanism that controls the wire movement with a worm gear arrangement. The other side is a control system that rotates two-cylinder, the stator winder cylinder, and the wire shaft shifting so that the coil is stacked helically in each layer. This prototype design has been made and the stator winding temperature increase is tested with 2.5 Celsius degrees on the average, with the baseline of temperature increase less than 10 Celsius degrees form the ambient temperature.

Permasalahan yang sering terjadi di kubikel 20 kV adalah korona, yaitu suatu fenomena yang terjadi pada saat udara di sekitar konduktor atau penghantar terionisasi akibat penurunan suhu naiknya kelembaban karena heater tidak aktif / rusak. Dari proses tersebut terjadilah pelepasan muatan yang mengakibatkan kegagalan isolasi pada udara, sehingga berpotensi merusak peralatan di dalam kubikel dan menghasilkan rugi-rugi daya. Oleh karena itu sistem pemantauan suhu dan kelembaban dapat menjadi satu solusi untuk meminimalisir efek korona pada kubikel. Sistem ini dirancang menggunakan sensor DHT22 untuk memantau suhu dan kelembaban serta NodeMCU sebagai mikrokontroler . Hasil dari pembacaan sensor ditampilkan pada web untuk diamati oleh petugas, sehingga dapat dilakukan deteksi dini kemunculan korona pada kubikel. Dari hasil pengujian, sensor dapat membaca suhu dan kelembaban sesuai dengan pengaturan heater yang terpasang pada kubikel 20 kV dan hasil pengukuran sensor menunjuk k an galat 0,3% serta d apat dimunculkan pada web yang dirancang untuk antarmuka dengan pengguna dan potensi .

Academic community activities on campus certainly produce various types of waste, especially paper, plastic bottles, batteries, and various other types of waste. 18% of all criteria Green Campus Criteria according to UI Greenmetric is waste management. Based on the criteria, the campus needs to be focused on the waste management system such as waste segregation, pre-recycling, recycling, organic waste management, and policies on waste management at the university governance to reduce the use of paper and plastic packaging. Technology can be used to improve waste management systems, preparation for recycling waste by crushing it before recycling, collection and transfer of waste to landfill, or organic waste composers around the campus. Various sensors and alarm systems are integrated into waste collection equipment and can be connected through the Internet of Things (IoT) system to be monitored by the authorities. Through the design of a technology-based waste management system, it is hoped that it can reduce waste production for the environment and can increase Green Campus rank which certainly provides positive benefits for the environment, the academic community, and society

This study aims to determine the ability of mathematical creative thinking of students in one of the Vocational Schools in Cimahi City with indicators of students' mathematical creative thinking skills used are fluency, flexibility, originality and elaboration. The ability to think creatively mathematically is the ability to learn mathematics in finding new ideas or ideas that are different from the way, in their own language. This research was conducted on 29 students in one of the Vocational Schools in Cimahi City using qualitative descriptive methods. The instruments used were in the form of 4 items of description with mathematical creative thinking skills in space geometry. After getting the results or data, then the data is presented in the form of a percentage. And it can be concluded from this study that the ability of mathematical creative thinking of SMK students in Cimahi City is still very low because only one indicator whose percentage exceeds 50% is an indicator of fluency. The results of this study can increase knowledge about mathematical creative thinking of students in one of the Vocational Schools in Cimahi City and is useful to facilitate education practitioners in developing mathematical creative thinking skills

The ability to think critically is one of the highest levels of ability. Developing critical thinking skills in students is still considered important to be improved in schools so that students are able and accustomed to facing various problems around it. This study aims to analyze the critical thinking skills of junior high school students who are in excellent classes and regular classes. This research was conducted in Bandung Barat. In this study students are given a test in the form of questions with critical thinking skills, the problem is used to compare between the superior class and ordinary class. Assessment of the problem using several factors of critical ability include 1) students can not understand the problem correctly, 2) students rush in doing the problem, 3) the students cannot choose the problem-solving strategy correctly and 4) the students work on the problem systematically. Then the matter of critical thinking skills of mathematics is analyzed using quasi-experimental research method to analyze students' critical thinking ability that influence learning result. This study shows the differences in critical thinking ability of junior high school students who are in excellent class and ordinary class. This study shows that superior classes are better in mathematical critical thinking ability than a regular class. The results of this study can add knowledge about critical thinking mathematics junior high school students who are in the class and ordinary class and used to facilitate for educational practitioners in the development of critical mathematical thinking skills.

Desain interaksi adalah membangun suatu produk yang mudah untuk dipelajari, efektif digunakan, dan terasa nyaman bagi penggunanya. Perencana desain interaksi memerlukan pengetahuan tentang pengguna, teknologi dan interaksi antara keduanya. Dengan mengetahui aktivitas dapat diketahui tipe interaksi dan jenis alat interaksi yang digunakan. Ubiquitous health monitoring system adalah sebuah sistem pemantauan kesehatan yang digunakan oleh pengguna perseorangan untuk memantau kesehatannya terus menerus secara tidak sadar. Smart mouse merupakan salah satu perangkat yang digunakan pada ubiquitous health monitoring system. Pada mouse ini diterapkan teknologi tambahan untuk mengukur detak jantung dan suhu tubuh. makalah ini memberikan hasil desain berupa model konseptual, prototype, user experience, usability, user interface dari smart mouse. Kata kunci : desain interaksi, model konspetual, user experience, usability, user interface, smart mouse, ubiquitous health monitoring system