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Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) is the most used wireless transmission scheme in the world. However, its security is the interesting problem to discuss if we want to use this scheme to transmit a sensitive data, such as in the military and commercial communication systems. In this paper, we propose a new method to increase the security of MIMO-OFDM system using the change of location of fake subcarrier. The fake subcarriers’ location is generated per packet of data using Pseudo Random sequence generator. The simulation results show that the proposed scheme does not decrease the performance of conventional MIMO-OFDM. The attacker or eavesdropper gets worse Bit Error Rate (BER) than the legal receiver compared to the conventional MIMO-OFDM system.

COVID-19 menyerang manusia pada akhir tahun 2019. Penyebaran COVID-19 terjadi melalui droplet/cairan yang keluar dari mulut/hidung manusia. Antisipasi penyebaran COVID-19 dilakukan dengan menerapkan pola hidup bersih dan sehat. Salah satu caranya adalah dengan mencuci tangan menggunakan hand sanitizer. Penggunaan hand sanitizer di tempat umum memungkinkan terjadinya kontak fisik antar pengguna sehingga diperlukan cara untuk mengurangi kontak fisik tersebut. Cara yang bisa diterapkan adalah dengan menggunakan hand sanitizer otomatis. Prinsip dari hand sanitizer otomatis ini adalah ketika tangan didekatkan dengan botol hand sanitizer maka secara otomatis cairan akan keluar dengan sendirinya ke telapak tangan. Berdasarkan hasil penelitian yang telah dilakukan, hand sanitizer telah berhasil dibuat dan dapat digunakan di Politeknik Negeri Batam.

The heart is a very important part of the body. The main job of the heart is to pump blood to all parts of the body. The heart has a rhythmic beat when it is pumping blood. This rhythm varies according to the health condition of a person. Therefore, it is necessary to have a system to monitor this rhythm change. The most well-known way to detect the rhythm or speed of the heartbeat is by using sensors. This paper implements a sensing device using a heart rate sensor and an IoT device. The heart rate sensor used is the MAX30100 sensor. As the main processing is an ESP-WROOM-32 which is famous for its WIFI and Bluetooth features. All these devices are combined in a sensor box that is embedded in the faceshield. The result is a faceshield capable of monitoring heart rate and sending the data to various connected devices. The experimental results show the instrument's accuracy value of 9.68% compared to the professional Pulse Oximeter used in hospitals.

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