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Estimate of the Percent Reduction of the Workers Hearing Loss by Doing a Training Intervention Based on BASNEF Pattern

Rohollah Fallah Madvari Fereydoon Laal Milad Abbasi Mohammad Reza Monazzam Alireza Fallah Madvari

Archives of Acoustics | 2019 | vol. 44 | No 1 | 27-33 | DOI: 10.24425/aoa.2019.126349

Keywords hearing loss hearing protective devices ISO 1999 BASNEF

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Abstract

If we want to provide the efficient training intervention to increase the duration of using hearing protection devices (HPDs) by workers, we need a tool that can estimate the person’s hearing threshold taking into account noise exposure level, age, and work history, and compare them with audiometry to find out the percent reduction of workers hearing loss.

First, the workers noise exposure level was determined according to ISO 9612, then 4000 Hz audiometry was done to find age and work history. On basis of ISO 1999 the hearing threshold was estimated and if the hearing protection device was not used continuously and correctly, the hearing protection device’s actual performance was reduced adjusted with person’s audiometry. After training intervention, the estimate was done again and was compared with the adjusted audiometry.

According to ISO 1999 standard estimation results, the percent reduction of the workers hearing loss level was 6.48 dB in intervention group. This level remained unchanged in control group. The mean score of hearing threshold estimation (standard ISO 1999) was statistically more significant than mean score of hearing threshold (p-value ¡ 0.001). The results show not significant change in control group due to lack of changing of noise exposure level.

In regards to the results of hearing threshold estimation based on ISO 1999 and comparing with workers audiometry, it can be seen that BASNEF training intervention increases the duration of using the HPDs and it could be effective in reducing hearing threshold related to noise.

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Authors and Affiliations

Rohollah Fallah Madvari

Fereydoon Laal

Milad Abbasi

Mohammad Reza Monazzam

Alireza Fallah Madvari

High-Rate Permutation Coding with Unequal Error Protection

Kehinde Ogunyanda Theo G. Swart Opeyemi O. Ogunyanda

International Journal of Electronics and Telecommunications | 2022 | vol. 68 | No 1 | 27-33 | DOI: 10.24425/ijet.2022.139844

Keywords Channel coding High-rate codes Permutationcodes Power Line Communications Unequal error protection

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Abstract

Channel coding provides numerous advantages to digital communications. One of such advantages is error correcting capabilities. This, however, comes at the expense of coding rate, which is a function of the codebook’s cardinality |C| or number of coded information bits and the codeword length M. In order to achieve high coding rate, we hereby report a channel coding approach that is capable of error correction under power line communications (PLC) channel conditions, with permutation coding as the coding scheme of choice. The approach adopts the technique of unequal error correction for binary codes, but with the exception that non-binary permutation codes are employed here. As such, certain parts of the information bits are coded with permutation symbols, while transmitting other parts uncoded. Comparisons with other conventional permutation codes are presented, with the proposed scheme exhibiting a relatively competitive performance in terms of symbol error rate.

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Authors and Affiliations

Kehinde Ogunyanda

Theo G. Swart

Opeyemi O. Ogunyanda

Center for Telecommunications, Department of Electrical and Electronic Engineering Science, University of Johannesburg, Johannesburg, South Africa

Spatiotemporal mapping of inundation area at Lake Limboto in Gorontalo, Indonesia, using cloud computing technology

Rakhmat Jaya Lahay Syahrizal Koem

Journal of Water and Land Development | 2022 | No 52 | 27-33 | DOI: 10.24425/jwld.2021.139940

Keywords Google Earth Engine Lake Limboto lake shrinkage Landsat remote sensing water index

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Abstract

Monitoring activities on the dynamics of water shrinkage at Lake Limboto are essential to the lake’s ecosystem’s recovery. A remote sensing technology functions to monitor the dynamics of lake inundation area; this allows one to produce a comprehensive set of spatial and temporal data. Such complex satellite dataset demands extra time, greater storage resources, and greater computing capacity. The Google Earth Engine platform emerges as the alternative to tackle such problems. The present study aims to explore the capability of Google Earth Engine in formulating spatial and temporal maps of the inundation area at Lake Limboto. A total of 345 scenes of Landsat image on the study area (available during the period of 1989–2019) were involved in generating a quick inundation area map of the lake. The whole processes (pre-processing, processing, analysing, and evaluating) were automatized by using the Google Earth Engine interface. The evaluation of mapping result accuracy indicated that the average score of F1-score and Intersection over Union (IoU) was at 0.88 and 0.91, respectively. Moreover, the mapping results of the lake’s inundation area from 1989 to 2019 showed that the inundation area tended to decrease significantly in size over time. During the period, the lake’s area also shrank from 3023.8 ha in 1989 to 1275.0 ha in 2019. All in all, the spatiotemporal information about the changes in lake area may be treated as a reference for decision-making processes of lake management in the future.

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Authors and Affiliations

Rakhmat Jaya Lahay

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ORCID:

Syahrizal Koem

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ORCID:

Universitas Negeri Gorontalo, Department of Earth Science and Technology, B.J Habibie Street, Bone Bolango, 96183, Gorontalo, Indonesia

Suture-like pattern formation in the pterygospinous bridge of the human sphenoid bone

Janusz Skrzat Grzegorz Goncerz

Folia Medica Cracoviensia | 2023 | Vol. 63 | No 4 | 27-33 | DOI: 10.24425/fmc.2023.148755

Keywords pterygospinous bridge pterygospinous ligament pterygoid process sphenoid bone

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Abstract

The paper presents an anatomical study involving rare variations in the pterygospinous bridges found in Mongolian skulls. These structures extend between the lateral pterygoid plate and the sphenoid spine. Particularly interesting is the division of these bridges into two distinct parts of the similar length. The junctions within these structures resemble morphological patterns characteristic for the plain and zigzag sutures, which articulate the cranial bones.

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Authors and Affiliations

Janusz Skrzat

Grzegorz Goncerz

Department of Anatomy, Faculty of Medicine, Jagiellonian University Medical College, Kraków, Poland

Diatomological and geochemical evidence of littorina transgression in Pomeranian Bay, Southern Baltic Sea

Robert Kostecki Beata Janczak-Kostecka

Studia Quaternaria | 2010 | Vol. 27 | 27-33

Keywords diatoms geochemistry Littorina transgression Pomeranian Bay southern Baltic Sea

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This article presents results of the analysis of 3 sediment cores taken from the bottom of Pomeranian Bay, southern Baltic Sea. These results are part of a larger project that aims to determine the characteristics and rate of the Atlantic marine ingression in the Pomeranian Bay area. The main geochemical elements and diatom assemblages from the cores were identified, revealing lacustrine sediments deposited during the time of Ancylus Lake and marine sediments deposited during the Littorina transgression. Distinct changes in the geochemical composition and diatom assemblages suggest that the Littorina transgression had a very large impact on the environment of Pomeranian Bay.

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Robert Kostecki

Beata Janczak-Kostecka

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Estimate of the Percent Reduction of the Workers Hearing Loss by Doing a Training Intervention Based on BASNEF Pattern

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High-Rate Permutation Coding with Unequal Error Protection

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Authors and Affiliations

Spatiotemporal mapping of inundation area at Lake Limboto in Gorontalo, Indonesia, using cloud computing technology

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Authors and Affiliations

Suture-like pattern formation in the pterygospinous bridge of the human sphenoid bone

Abstract

Authors and Affiliations

Diatomological and geochemical evidence of littorina transgression in Pomeranian Bay, Southern Baltic Sea

Abstract

Authors and Affiliations