International Journal of Engineering Technologies and Management Research

TWO-HANDED DYNAMIC GESTURE RECOGNITION USING RGB-D SENSORS

Yu-Chi Pu, Wei-Chang Du, Kai-Wei Shih — Wed, 07 May 2025 00:00:00 +0000

Sign language is a form of visual-gestural communication that conveys semantic content through hand movements and postures. It comprises a structured set of gestures, each associated with specific meanings. For individuals with hearing impairments, sign language serves as a primary medium for expression, perception, and interaction with the external world. However, due to the general lack of sign language proficiency among the broader population, effective communication remains a significant challenge. This paper uses an RGB-D imaging device to capture both color and depth information of dynamic hand gestures, enabling more robust and discriminative feature extraction than traditional RGB-based approaches. The proposed system focuses on recognizing two-handed dynamic gestures by analyzing spatial configurations and temporal motion patterns. A gesture symbolization mechanism facilitates the recognition process, wherein complex gesture sequences are encoded into a set of primitive symbols representing key postures and transitions. These symbolic representations are then compared using a fuzzy matching algorithm, which accounts for variations in gesture execution and temporal alignment, thereby enhancing the system's tolerance. This methodology aims to provide a reliable and flexible framework for real-time gesture recognition in natural interaction scenarios.

THE CRISTAL WITH PARTICIPATE OF THE XENOMORPHIC SURFACE AND THE VARIANCE OF FACE SYSTEM

Admakin L. A. — Wed, 14 May 2025 00:00:00 +0000

Geometric crystallography studies the external form of a crystal, formed by a combination of geometric planes - reticular faces. This form of natural crystals can vary from simple forms, with the smallest number of faces, to polyhedral, with a certain number of faces. Such crystals are called idiomorphic, since they are geometric crystalline polyhedra. Faces that differ in reticular densities are called reticular, and faces multiplied by symmetry elements are called identical. The set of these faces is called a faceted form. By symmetry operations, the faceted form is transformed into a form consisting of only reticular faces. Such a form is called a faceted system. However, natural crystals are often subject to mechanical and (or) chemical dislocations and a xenomorphic surface appears in the faceted form. The faces can be partially or completely destroyed, and the crystalline polyhedron becomes unclosed, a greater or lesser part of the surface of its previously euhedral crystal becomes xenomorphic, and the face system consisting of the preserved reticular faces and the xenomorphic surface is combined; in it, the xenomorphic surface closes the crystalline polyhedron. Such crystals are hypidiomorphic. Xenomorphization, as a process of destruction of reticular faces, changes the thermodynamic state of the crystal. However, in geometric crystallography this surface is considered as a crystal defect, and the hypidiomorphic crystal is still studied as euhedral, its equilibrium is estimated, which is unjustified, since the xenomorphic surface is characterized by its own surface tension and, in essence, plays the role of an independent faceted surface. The role of the xenomorphic surface in the variability of such crystals was studied for the first time. Variance functions are obtained for different states of a face system involving a xenomorphic surface.

CLIMATE VARIABILITY AND COASTAL MARITIME AREAS: PERCEPTIONS OF ARTISANAL MARINE FISHERMEN IN THE MUNICIPALITY OF GRAND-POPO, BENIN

Emile Yedahoun, Arzu Morkoyunlu — Wed, 14 May 2025 00:00:00 +0000

Benin, a West African country bordered by the Gulf of Guinea, derives a significant portion of its Gross Domestic Product (GDP) from the agricultural sector, with fishing making a notable contribution. The fishing sector in Benin comprises inland fishing, artisanal marine fishing, and industrial marine fishing, which account for approximately 75%, 24%, and 1% of the national fish production, respectively. Grand-Popo stands out among the five major coastal municipalities in Benin due to its substantial contribution to national output from artisanal marine fishing. For several years, Grand-Popo has been facing significant climate variability, which increasingly affects the output from artisanal marine fishing. The study aims to assess the impact of climate variability on the coastal areas of Grand-Popo. To this end, local rainfall data, national artisanal fishing statistics, and a socioeconomic survey of fishermen in the municipality were analyzed. An analysis of rainfall data collected in Grand-Popo between 1970 and 2017 highlights a correlation between drought episodes (severe or moderate), notably in 2000, 2005, 2007, 2011, and 2017, and notable declines in national artisanal fishing production. The year 2000, marked by a severe drought, recorded the lowest production (5,320 tons) during the period from 1998 to 2018. Nearly all artisanal marine fishers (99.58%) perceive this climate variability and report that it manifests through irregular rainfall distribution, rising temperatures, and its impacts include ecosystem degradation, migration and disappearance of certain species, rising sea levels, and coastal erosion. In conclusion, climate variability hurts fishing statistics in Grand-Popo and at the national level.