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Classification of skin cancer images by applying simple evolving connectionist system Al-Khowarizmi Al-Khowarizmi; Suherman Suherman
IAES International Journal of Artificial Intelligence (IJ-AI) Vol 10, No 2: June 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijai.v10.i2.pp421-429

Simple evolving connectionist system (SECoS) is one of data mining classification techniques that recognizing data based on the tested and the training data binding. Data recognition is achieved by aligning testing data to trained data pattern. SECoS uses a feedforward neural network but its hidden layer evolves so that each input layer does not perform epoch. SECoS distance has been modified with the normalized Euclidean distance formula to reduce error in training. This paper recognizes skin cancer by classifying benign malignant skin moles images using SECoS based on parameter combinations. The skin cancer classification has learning rate 1 of 0.3, learning rate 2 of 0.3, sensitivity threshold of 0.5, error threshold of 0.1 and MAPE is 0.5184845 with developing hidden node of 23. Skin cancer recognition by applying modified SECoS algorithm is proven more acceptable. Compared to other methods, SECoS is more robust to error variations.

Design and simulation hybrid filter for 17 level multilevel inverter Marshal Andrea Hutabarat; Syafruddin Hasan; Ali Hanafiah Rambe; Suherman Suherman
Bulletin of Electrical Engineering and Informatics Vol 9, No 3: June 2020
Publisher : Institute of Advanced Engineering and Science

The increasing of renewable energy applications such as solar cells, wind power, ocean thermal and HVDC (high voltage direct current) cause increment in the use of the inverter circuit. Harmonics that are generated by the inverter have negative impacts on the electrical equipment; harmonics cause excessive heat and may shorten the life of electrical equipment. A multilevel inverter is an arranged of cascaded inverters which aims to reduce total harmonic distortion (THD). This paper proposes the design of 17 levels of a single-phase cascaded multilevel inverter with a hybrid filter insertion. By using PSIM simulator, the hybrid filter is proven reducing THD better than single pulse width modulation (SPWM) inverter. Installation of the hybrid filter is able to fix a maximum of 0.23% THDv and a maximum of 1.05% THDi. Hybrid filter installation reduces the value of THD to comply with IEEE 519-2014 standard.

WiFi-Friendly Building to Enable WiFi Signal Indoor Suherman Suherman
Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v7i2.871

The 802.11 networks (wireless fidelity (WiFi) networks) have been the main wireless internet access infrastructure within houses and buildings. Besides access point placement, building architectures contribute to the WiFi signal spreading. Even dough WiFi installation in buildings becomes prevalent; the building architectures still do not take WiFi-friendliness into considerations. Current research on building and WiFi are on access point location, location based service and home automation. In fact, the more friendly the building to WiFi signal, the more efficient the 802.11 based wireless infrastructure. This paper introduces the term of WiFi-friendly building by considering signal propagations, the obstacle impact, as well as proposing an ornament-attaced reflector and a hole-in-the-wall structure to improve WiFi signal distribution. Experiment results show that obstacle materials made of concrete reducing WiFi signal the most, followed by metal and wood. Reflecting materials are able to improve the received signal level, for instance, the implemented ornament-attached reflector is able improving the received signal up to 6.56 dBm. Further, the hole-in-the-wall structure is successfully increasing WiFi signal up to 2.3 dBm.

WiFi-Friendly Building to Enable WiFi Signal Indoor Suherman Suherman
Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

The 802.11 networks (wireless fidelity (WiFi) networks) have been the main wireless internet access infrastructure within houses and buildings. Besides access point placement, building architectures contribute to the WiFi signal spreading. Even dough WiFi installation in buildings becomes prevalent; the building architectures still do not take WiFi-friendliness into considerations. Current research on building and WiFi are on access point location, location based service and home automation. In fact, the more friendly the building to WiFi signal, the more efficient the 802.11 based wireless infrastructure. This paper introduces the term of WiFi-friendly building by considering signal propagations, the obstacle impact, as well as proposing an ornament-attaced reflector and a hole-in-the-wall structure to improve WiFi signal distribution. Experiment results show that obstacle materials made of concrete reducing WiFi signal the most, followed by metal and wood. Reflecting materials are able to improve the received signal level, for instance, the implemented ornament-attached reflector is able improving the received signal up to 6.56 dBm. Further, the hole-in-the-wall structure is successfully increasing WiFi signal up to 2.3 dBm.

ANALISIS KUALITAS TRANSMISI VIDEO DENGAN DECODABLE FRAME RATE Muhammad Mulia Maulana; Suherman Suherman
Singuda ENSIKOM Vol 14, No 39 (2016)
Publisher : Singuda ENSIKOM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.156 KB)

Meningkatnya kebutuhan masyarakat akan informasi video, dibutuhkan sistem transmisi video yang baik. Kinerja transmisi video dapat dievaluasi melalui model matematis. Tulisan ini membandingkan hasil percobaan transmisi video pada jaringan 802.11 dan hasil analisis model Decodable Frame Rate. Decodable Frame Rate menganalisis kinerja transmisi video yang menggunakan nilai probabilitas terdekodekannya data video yang diterima. Hasil percobaan dengan jumlah 6 user diperoleh jumlah frame yang decodable adalah 34% dari jumlah frame yang dikirimkan. Sedangkan dari hasil analisis model Decodable Frame Rate diperoleh jumlah frame yang decodable adalah 3% dari jumlah frame yang dikirimkan. Jumlah frame yang decodable dipengaruhi oleh nilai packet loss ketika video ditransmisikan. Semakin besar jumlah user maka nilai packet loss juga akan semakin meningkat dan frame yang decodable akan semakin kecil sehingga kualitas video yang diterima juga semakin menurun.

WiFi-Friendly Building to Enable WiFi Signal Indoor Suherman Suherman
Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

The 802.11 networks (wireless fidelity (WiFi) networks) have been the main wireless internet access infrastructure within houses and buildings. Besides access point placement, building architectures contribute to the WiFi signal spreading. Even dough WiFi installation in buildings becomes prevalent; the building architectures still do not take WiFi-friendliness into considerations. Current research on building and WiFi are on access point location, location based service and home automation. In fact, the more friendly the building to WiFi signal, the more efficient the 802.11 based wireless infrastructure. This paper introduces the term of WiFi-friendly building by considering signal propagations, the obstacle impact, as well as proposing an ornament-attaced reflector and a hole-in-the-wall structure to improve WiFi signal distribution. Experiment results show that obstacle materials made of concrete reducing WiFi signal the most, followed by metal and wood. Reflecting materials are able to improve the received signal level, for instance, the implemented ornament-attached reflector is able improving the received signal up to 6.56 dBm. Further, the hole-in-the-wall structure is successfully increasing WiFi signal up to 2.3 dBm.

Realisasi Sistem Switch Lampu Penerangan Ruangan Otomatis Untuk Meningkatkan Efisiensi Energi Listrik Bakhtiar Bakhtiar; Suherman Suherman
Jurnal Arus Elektro Indonesia Vol 1 No 2 (2015)
Publisher : Fakultas Teknik, Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Penghematan energi listrik sangat bergantung pada perilaku dan kesadaran manusia. Sekitar 80% keberhasilan kegiatan konservasi energi ditentukan oleh faktor manusia, sedangkan 20% lagi bergantung teknologi dan peralatan. Salah satu solusi alternatif dalam permasalahan ini adalah menerapkan sistem otomasi sehingga secara otomatis menghidupkan dan mematikan lampu ruangan dengan mendeteksi keberadaan manusia di dalam ruangan. Dalam penulisan ini melakukan realisasi rancangan agar dapat dimanfaatkan oleh masyarakat sebagai fitting ekstensi otomatis dalam upaya penghematan daya listrik. Penelitian ini juga membandingkan disipasi daya yang timbul saat lampu tidak menyala dengan lampu sensor gerak yang ada di pasaran. Realisasi rancangan terdiri dari dua sistem yaitu, menggunakan sensor PIR terintegrasi pewaktu NE555 dan sensor PIR terintegrasi mikrokontroler Atmega 8 SMD. Hasil yang dicapai adalah, disipasi daya lampu sensor gerak type LED di pasaran adalah 6,2 Watt, lampu penerangan ruangan otomatis terintegrasi pewaktu IC555 lebih efisien 79,26% dibandingkan lampu sensor gerak di pasaran, lampu penerangan ruangan otomatis terintegrasi mikrokontroler atmega 8 lebih efisien 60,39% dibandingkan lampu sensor gerak di pasaran. Kata Kunci: Efisiensi, Lampu Otomatis, Light Fitting, Mikrokontroler, Sensor gerak, Timer

3D Modeling Parallel Coupled-Line Bandpass Filter Based on Coplanar Waveguide MMIC Multilayer Technology Rizqi Eka Putri; Emerson Pascawira Sinulingga; Suherman Suherman
TELKA - Jurnal Telekomunikasi, Elektronika, Komputasi dan Kontrol Vol 5, No 1 (2019): TELKA
Publisher : Jurusan Teknik Elektro UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/telka.v5n1.24-30

Electromagnetic modeling technique on monolithic microwave integrated circuit (MMIC) coplanar waveguide (CPW) multilayer have been developed to accurately model the Parallel Coupled-Line Bandpass Filter. The 3D modeling technique shows the simulation results that are optimum. Several simulation steps have been demonstrated and compared on the design of Parallel Coupled-Line Bandpass Filters. Based on the 3D modeling, S11-Return Loss and S21-Insertion Loss of -22.6 dB and and 2.94 dB are obtained respectively. In addition, it is shown the best frequency response from the design of the Parallel Coupled-Line Bandpass Filter.

Increasing transmission control protocol speed by reducing the acknowledgement collision probability Suherman Suherman; Ali Hanafiah Rambe; Norshakila Haris; Anhar Anhar
Indonesian Journal of Electrical Engineering and Computer Science Vol 22, No 1: April 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v22.i1.pp121-128

Transmission control protocol (TCP) employs acknowledgement (TCP-ACK) for every transmitted packets to ensure reliable transmission. As a result, it sends the next window packets after receiving the TCP-ACK packet of previous window. This means that the earlier the TCP-ACK packet arrives, the faster the TCP next window transmission and the better the TCP performances. To do so, there should be a special treatment to the transmitted TCP-ACK to fasten next window transmission. This paper proposes a collision probability reduction for the transmitted TCP-ACK packets so that the overall TCP delay reduces. Collision probability reduction can be implemented in many ways. Initially, mathematical analysis is provided to prove that method can work as expected. The mathematic analysis shows that when TCP-ACK collision probability is reduced, the overall TCP delay is also reduced. The proposed method is then implemented in 802.11, 802.16 and complex networks. The NS-2 simulations evaluations for the aforementioned networks and the proposed method proved that collision reductions on TCP-ACK exert average TCP delay reductions about 11.86%, 28.04% and 9.46% subsequently.The proposed method is also applicable for other TCP types.

Design and characteristics assessment of wireless vibration sensor for buildings and houses Suherman Suherman; Fahmi Fahmi; Ulfa Hasnita; Zul Herri
Indonesian Journal of Electrical Engineering and Computer Science Vol 21, No 3: March 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v21.i3.pp1381-1388

This paper reports the wireless vibration detector design and characterization for practical applications. System is built by using the ATmega microcontrollers, working on a free license 433 MHz frequency. Hardware characteristics are defined through experimental assessments. Assessment mainly on sensor output and sensor installation characteristics. As results, hardware is working as expected, where vibration level achieves at most 13% detection for 12 g vibration source. The vertical axis of the MPU6050 vibration detector results 87.5 times higher detection than in horizontal axis. Detected vibration increases from 1.03 g to 2.61 g when source-sensor distance is shortened from 10 cm to 2 cm. The aluminium sheet as sensor pad causes detection of 8.69 times higher than on ceramic pad. The lower the detection period the better the detection amplitude. However, the lower the period, the higher the consumed power. Microcontroller sleep mode is not suitable for short period detection. The node-based data validation to avoid transmitting false detection is not influencial for short period detection.

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