A wheelchair is a tool that can be used to mobilize patients who experience paralysis, especially paralysis in the legs, so they can move from one place to another independently. An electric wheelchair is a type of wheelchair that can be controlled by a patient without having to be controlled by another person. The design of this tool utilizes an ADXL335 accelerometer sensor mounted on the patient's head as a determinant of the direction of wheelchair movement, BTS7960 as a DC motor driver, a motor wiper as the main drive for a wheelchair, and the Atmega328P microcontroller as an input and output processor. Gestures of the patient's head (looking down, looking up, head tilted to the right, tilting left) will produce a different voltage output which will be processed by Atmega328P as a determinant of the direction of motion which will be sent to the BTS790 driver to drive the wipper motor as the main driver of the wheelchair. The method of testing and measurement carried out is by testing the response of the ADXL335 accelerometer sensor with the test results of the ADXL335 accelerometer sensor having an accuracy of determining the direction of motion of 100%. The results of testing the average wheelchair speed of 2.3 km / hour with a patient weight of 40-60 kg, and the test results of battery endurance in a wheelchair of 5.07 hours with a patient weight of 40-70 kg with a 12V18Ah battery.

Penelitian ini bertujuan untuk mendeskripsikan pengetahuan kontekstual, konseptual, dan prosedural matematis siswa SMK dalam memecahkan tugas matematis yang disajikan dalam konteks "jangkauan". Penelitian ini menggunakan pendekatan kualitatif dengan menitik beratkan teknik pengumpulan data melalui wawancara dan observasi. Partisipan yang terlibat dalam penelitian ini adalah 20 siswa SMK Kompetensi Teknik dan Bisnis Sepeda Motor Kelas X di Ciamis, Indonesia. Siswa memecahlan tugas pada topik persamaan dan pertidaksamaan nilai mutlak yang disajikan dalam konteks jangkauan. Analisis dilakukan terhadap pengetahuan kontekstual, konseptual, dan prosedural yang dimiliki oleh siswa. Hasilnya menunjukkan bahwa siswa yang mampu mengoneksikan pengetahuan kontekstual terhadap pengetahuan konseptualnya sukses memecahkan tugas matematis. Hal tersebut menunjukkan bahwa pengetahuan kontekstual memiliki peran pertama dalam menentukan konsep matematis yang diperlukan dalam memecahkan tugas, yang didukung pengetahuan prosedural yang akan mengantarkan siswa memperoleh solusi yang tepat.

The planned construction of the Kulonprogo district’s strategic zone, which began in 2013, this Regency will certainly experience a large development, so for that, it needs to be accompanied by adequate electricity preparation. Based on the real conditions, the speed of construction is experiencing some obstacles, so there is only phase 1 of NYIA airport has been completed by 2020, while for the Steel Industry Center construction, Iron Sand Processing, Adikarto Port, there are also have many obstacles. This also affected the domestic and non-domestic residents’ activities, especially in terms of economic progress in the district. This study intended to evaluate the preparation of electricity power so its preparation is expected to be more efficient. From the results of this study at the end of 2032, at least 626 MVA of electricity power needs to be prepared to support an estimated peak load of 438 MVA. This research was conducted quantitatively and aimed for giving some references to be used by PT PLN (Persero) in reviewing Electricity Supply Business Plan (RUPTL).

AbstrakKebakaran pada gedung perkantoran sering kali disebabkan oleh kecelakaan listrik, terutama gedung tinggi yang rata-rata berusia lebih dari 20 tahun. Hal tersebut merupakan akibat dari perubahan fungsi ruang yang tidak diimbangi dengan penyesuaian instalasi listrik yang memadai. Di samping itu, minimnya pemeliharaan turut serta memperburuk keamanan dan kualitas daya guna listrik. Untuk mengatasi hal tersebut, salah satu upaya  yang dapat dilakukan adalah dengan cara retrofitting. Penelitian dilakukan melalui survey pengukuran dan observasi visual pada gedung perkantoran di Jakarta. Setelah dilakukan retrofitting dari hasil analisis data, dapat ditunjukan bahwa konsumsi energi pada beban puncak dapat dihemat sampai dengan 27%. Sedangkan resiko kecelakaan listrik dapat ditekan serendah-rendahnya dengan memperbaiki sistem instalasinyaKata kunci : Retrofitting, Kecelakaan Listrik, Efisiensi  AbstractFire case in office buildings mostly occurs by some electrical accidents; especially it happens in most multi-storey building with twenty years old or more. It caused by some altering room function without any proper electrical installation adjustment. Moreover, less-maintenance issue made its installation quality, electrical safety and efficiency getting worse. Those issues can generates some electrical hazard risks, and also turns out of abundant energy consumption. These problems can be resolved by retrofitting. The research was conducted in Jakarta by measuring survey and visual identification. According to the data analysis, retrofitting can reduce about 27% building power consumption at peak load and it can avoid any electrical hazards.Key words : retrofitting, electrical hazard, efficiency