Volume 29, No. 2 (2023)

EMG- BASED HAND GESTURE RECOGNITION USING DEEP LEARNING AND SIGNAL-TO-IMAGE CONVERSION TOOLS

SABRINA AKTER, BIMAL KUMAR PRAMANIK, MD EKRAMUL HAMID(*)

In this paper, deep learning-based hand gesture recognition using surface EMG signals is presented. We use Principal component analysis (PCA) to reduce the data set. Here a threshold-based approach is also proposed to select the principal components (PCs). Then the Continuous wavelet transform (CWT) is carried out to prepare the time-frequency representation of images which is used as the input of the classifier. A very deep convolutional neural network (CNN) is proposed as the gesture classifier. The classifier is trained on 10-fold cross-validation framework and we achieve average recognition accuracy of 99.44%, sensitivity of 97.78% and specificity of 99.68% respectively.

DEVELOPMENT OF A NIGERIAN CULTURAL ATTIRE RECOGNITION SYSTEM

OGUNBIYI DIMPLE(*1), JIMOH KUDIRAT(1), ADEBAYO OLAJIDE(1), OKELOLA LOVELYN(1)

This paper presents the development of a system to automatically recognize Nigerian traditional attire worn by major ethnic groups. Samples of clothing images depicting the cultural groups were obtained from publicly available online sources and an architecture to classify the images classes was designed using the Convolutional Neural Network (CNN) model. Performance evaluation results from experiment show that the model can classify images accordingly, achieving a validation accuracy score of 86 %. A web application interface was also implemented to validate the model’s accuracy which shows good potential when integrated in commercial clothing applications.

SELECTION, TECHNO-ECONOMIC AND ENVIRONMENTAL ANALYSIS OF OFF-GRID POWER SYSTEM FOR APPLICATION IN A NIGERIAN UNIVERSITY BUILDING

CHIDIEBERE DIYOKE(*1), THOMAS OKECHUKWU ONAH(1), OKWUCHUKWU INNOCENT ANI(1)

The electricity mix and access duration in Nigerian educational institutions is poor. This paper presents analysis of the off-grid optimal energy systems (OES) for serving a Nigerian university building load. The feasible system for serving the demand load of 250kWh/day for the building is a hybrid power system consisting of a 75kW rated solar PV, 40kW biogas engine and a 30 number 1kWh battery bank storage operating with a 33.6kW converter. The OES’s COE and NPC are 0.253$/kWh and $175219.7 respectively. Scenario analysis outcomes indicate that the building OES varies with load and resource potential.

REVIEW OF SOLAR AIR HEATERS EMBEDDED WITH PHASE-CHANGE MATERIALS (PCM) FOR BETTER PERFORMANCES

VISARION-CĂTĂLIN IFRIM(1*), TEODOR POP(1), CIPRIAN BEJENAR(1)

The technology of solar air heating systems is one of the branches that is of great importance in capturing and capitalizing on solar energy. This paper presents a summary of the literature on solar air heating systems embedded with materials that have the ability to retain thermal energy, during periods of maximum intensity of solar radiation and its release, when solar energy is reduced or missing for a period of time. It presents the designed and carried out systems by different researchers and the thermal performances obtained in the period of 2017-2021.

POZZOLANICITY OF KIMBUNGU BASALT AS A SUBSTITUTE FOR CLINKER TO PRODUCE AN ECOLOGICAL CEMENT IN KONGO CENTRAL

KISONGA MANUKU ERIC(1,2), BONGWELE ONANGA GUY(1,2), WETSHONDO OSOMBA DOMINIQUE(1,2), ONGENDANGENDA TIENDE ALBERT(1,2), MUKEBA CIKALA LOUIS(1,2), SEKE VANGU MAX(1,3), MASAKA NKUELO DORCAS(1,4), UUCHI UMIRAMBE PARICIAN(1), MBUINGA BONGO FRANÇOIS(1), MUYONGELE GABY(1), KIZITO AGAMA(1), HOLENU MANGENDA HOLY(1,2*)

On Earth, there are several natural disasters, many ask the question of what is happening. The Earth is suffering from the harms of global climate change. The DRC, in its Southwestern part, is vulnerable to this phenomenon. The main cause is the presence of cement plants that produce Portland cement, by heating the limestone to about 1450°C. At this process temperature, limestone releases CO₂ which is among the very harmful greenhouse gases. It is for this reason that a study of an ecological cement with 75% clinker and 25% basalt was conducted. The resistance of this composite cement is well.

RECENT TENDENCIES IN PV/T SYSTEM PERFORMANCE – A REVIEW

TEODOR POP (1*), RADU-DUMITRU PENTIUC (1), VISARION-CĂTĂLIN IFRIM (1), PAVEL ATĂNĂSOAE (1)

The capacity, performance and ease of photovoltaic/thermal systems in producing at the same time electricity and heat have made this technology one of the most significant in terms of energy, worldwide. In the past years, researchers have focused their work on obtaining new configurations of hybrid PV/T systems that are sustainable, solve problems related to the space on the roof of buildings, lead to reduced emissions of greenhouse gases (GHG) and protect our natural environment by using renewable resources. This paper presents the recent trends of hybrid PV/T systems and their performance. Also, the thermal and electrical efficiencies are indicated for each studied article.

DETERMINATION OF THE TOTAL SUSPENDED SOLIDS CONTENT AND THE AMOUNT OF WASTE RETAINED BY THE SCREENING INSTALLATIONS

BIANCA-STEFANIA ZABAVA(1*), GHEORGHE VOICU(1), MADALINA-ELENA STEFAN(1), SORIN CANANAU(1)

The calculations were done for a wastewater treatment plant that had mechanical, biological, and sludge processing stages and served a population of about 11,100 people. Domestic wastewater, storm water, and industrial water collected from businesses that release into the sewage system are all treated at the treatment plant. The STAS 6953-81 method was used in this research to determine the total suspended solids content. The purification plant's efficiency in removing these substances was assessed using measurements taken from both the influent and effluent. The quantities of coarse material (by weighing) retained from the sewage treatment plant using the two types of screens were also determined. It was observed that the efficiency of the treatment plant was over 98%.