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All Journal Indonesian Journal of Electrical Engineering and Computer Science eProceedings of Engineering
Soo Young Shin
Kumoh National Institute of Technology
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

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Modified Pixels Based Fast Median Filter in Impulse Noise Environments Man Hee Lee; Soo Young Shin
Indonesian Journal of Electrical Engineering and Computer Science Vol 9, No 3: March 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v9.i3.pp731-741

Abstract

This paper proposes a modified pixel-based fast median filter (MP-FMF) for impulse noise environments. The key idea behind MP-FMF is the reduction in the processing time by using modified pixels. It consists of three steps, namely, error detection, threshold decision, and noise mitigation. The presence of noise is detected by using modified pixels that include a cyclic redundancy check (CRC) function. Subsequently, the threshold values are decided by estimating the noise density. For noise mitigation, corrupted pixels are corrected with the neighboring pixels based on the principle of the median filter. The MP-FMF has a fast processing time and provides image quality correction and introduces features when the noise density is high. In addition, we introduce a new evaluation metric and investigate the performance of the proposed algorithm in terms of the quality, features, and computation time.
A novel index modulation scheme with impedance matching Hye Yeong LEE; Soo Young Shin
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 3: June 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v14.i3.pp1203-1209

Abstract

Index modulation conveys more data given to indices of status of communication transmission item such as antenna and subcarrier. In this proposed system, we gave the index to the conditions of impedance matching or not. In the transmitter, antenna chooses one impedance according to the mapping table as active impedance. The receiver detects impedance index comparing of impedance between received signal and receivers. The proposed system improves not only transmitted information data by using impedance index but also spectral efficiency. In the simulation, Spectral Efficiency (SE) and Bit Error Rate (BER) were analyzed and compared to conventional modulation scheme.
Exploiting non-orthogonal multiple access in device-to-device communication Sang Hoon Lee; Soo Young Shin
Indonesian Journal of Electrical Engineering and Computer Science Vol 22, No 2: May 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v22.i2.pp919-926

Abstract

This paper proposes an uplink non-orthogonal multiple access (NOMA) system with device-to-device (D2D) communication, enabling NOMA users to communicate with other users/devices using D2D communication to improve the system capacity. In the NOMA-D2D system, two cellular users communicated with the BS using uplink NOMA, and two cellular users simultaneously communicated with the D2D users using downlink NOMA. Closed-form solutions for the ergodic sum capacity of the proposed system are derived analytically. The analytical results are validated via simulations and they are compared with the results obtained from conventional schemes. The comparison shows that, in scenarios where efficient interference cancellation can be achieved, the proposed NOMA system with the D2D model can achieve higher capacity gains than conventional benchmark schemes. When  dB, NOMA-D2D achieves capacity gains of 192.2% and 157.5% over the conventional OMA and the time-sharing-based NOMA, respectively.
Air Quality Measurement Device Using Programmable Quadcopter Drone Towards Swarm-iot (internet Of Things) Deriel Laska Lubna; Nyoman Bogi Aditya; Soo Young Shin
eProceedings of Engineering Vol 8, No 2 (2021): April 2021
Publisher : eProceedings of Engineering

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Abstract

Abstract Air pollution is a condition in which air quality is damaged and contaminated either by harmful or harmless substances to living things. The main problem with the air quality measurement system in the field is the inaccuracy. This is due to the system installation is installed in an area where there is a lot of traffic pollution. This thesis created an alternative method to measure air quality using overground measurements. This thesis invented an Air Quality Measurement Device Using Programmable Quadcopter Drone Towards Swarm-IoT (Internet of Things). With this alternative,Swarm-IoT drone can measure air quality above ground level. This thesis measured air quality using the MQ-135 sensor with a value range of 10 - 10000 ppm. Measurement of temperature and humidity using the DHT22 sensor. The range temperature is -40°C + 80°C, and the humidity range is from 0-100%. The temperature has an accuracy of 0.5° C, and the humidity, 2%. NodeMCU as a microcontroller. Data obtained from the sensor processed in NodeMCU and the database’s data over a Wi-Fi network displayed on Android. With these components, drones can measure air quality at an altitude of 0 m, 3 m and 5 m. The results denoted that the quadcopter can automatically detect air quality. Measurements of the data were viewed directly via a smartphone in real-time. Air quality testing was carried out in two places, namely GSG and Ciganitri field. The tests were done to determine the value of good air quality. The findings showed that good air quality was below the range of 720, and the worst was above 780. The average air quality results at the GSG at an altitude of 0m was 396, at an altitude of 3m was 389, and at an altitude of 5m was 387. While in the Ciganitri field, the average of air quality at an altitude of 0m was 695, at an altitude of 3m was 696, and at an altitude of 5m was 694. The deviation value of temperature measurement using a thermometer as a reference to obtain a value of 1.8 indicated that the measurement results using a sensor test device were close to accurate results. Keywords: IoT, Sensors, Drone, Air Quality.
Vision-based Autonomous Landing For Quadcopter Drone Using Openmv Rizqy Ilmi Naufal; Nyoman Karna; Soo Young Shin
eProceedings of Engineering Vol 9, No 4 (2022): Agustus 2022
Publisher : eProceedings of Engineering

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Abstract

Abstract—Nowadays, drones have a wider variety of applications. The drones are now used for daily activities that the demand for drones is increase and the shift to a lower price. Then, drones manufactured with poor build quality. Consequently, the drone is now more vulnerable to crashes. The crash on landing is one of the most common errors made by novice users. This research utilizes a vision-based precision landing method for quadcopter drones equipped with low-cost cameras capable of tracking AprilTag. The system deploy the Pixhawk as the flight controller, Mission Planner as the Ground Control Station (GCS) software, the OpenMV H7 camera, telemetry, and a computer. The test results obtained are the outdoor accuracy for 2 m altitude is outdoors 8.94 cm, semi-outdoor 9.1 cm, and indoor 11.7 cm. The average accuracy for 3 m altitude outdoors is 9.35 cm, semi-outdoor 9.45 cm, and indoor 10.8 cm, which indicates the system can perform vision-based autonomous landing for quadcopter. Index Terms—drone, computer vision, openMV, precision landing
Co-Authors Deriel Laska Lubna Hye Yeong LEE Man Hee Lee Nyoman Bogi Aditya Nyoman Karna Rizqy Ilmi Naufal Sang Hoon Lee