bluuebunny/crossref_metadata_2025 huggingface dataset:
The influence of thermo-hygrometric conditions on metamaterials' acoustic performance: an investigation on a 3D printed coiled-up resonator
Authors: Cingolani Matteo , Fusaro Gioia , Garai Massimo
Published: March 2023

In the last decades, coiled-up resonators have become popular within the metamaterial research community for narrow band, low frequency resonances combined to subwavelength thickness. Such structures are particularly suited to one of the most widespread manufacturing processes, i.e.
PET-based 3D printing. Acoustic performance of coiled-up resonators depends on the geometrical parameters' variation, which is influenced by thermo-hygrometric conditions; however, the deformation itself needs to be further investigated. For this reason, the present paper evaluates the correlation
between temperature, relative humidity, and the geometrical parameters' (spiral length and hole diameter) deformations and, consequently, the acoustic performance of a 3D printed coiled-up resonator. A combined approach through analytical, numerical, and experimental measurements quantified
the frequency shift of the resonance peaks (within 300 Hz - 5000 Hz) in terms of sound absorption coefficient increasing the temperature (T=10-50° C), and the relative humidity (RH=20-80 %) of the samples. Relative humidity variations turned neglectable discrepancies on sound absorption's
peaks. On the other hand, the increase in temperature caused a frequency peaks' shift following an exponential trend: this behavior is straight related to the exponential relationship between the temperature and specific volume function of polyethylene resins.
How Classroom Acoustic Conditions May Impact Autistic Students: A Review
Authors: Caldas Fernanda , Masiero Bruno , Wang Lily
Published: March 2023

Data about the prevalence of autism worldwide diverge across different censuses. However, with the growing availability of diagnostic assessments, the number of diagnosed autistic persons has been increasing over the years and, with that, also the need for accommodations. One differentiating
characteristic of autistic persons compared to those who are not is a hypo- or hypersensitive response to any sensory input, usually referred to as sensory processing disorder. Here we focus on auditory hypersensitivity. In room acoustics, and more specifically in the field of classroom acoustics,
it is known that the design of indoor spaces affects speech intelligibility and comprehension for people regardless of their neurological condition, which is essential in learning environments. For autistic persons, high levels of reverberation and background noise may lead to a sensory overload.
This situation could be ameliorated with the use of assistive technology or adequate acoustic design. In this paper we present a literature review regarding the impacts of room acoustics on autistic people, how it can be used as an accessibility tool, and propose ideas for work to be done
to better identify and resolve acoustic issues for autistic persons in classrooms.
Overview of the acoustic quality of dwellings in Ukraine and CIS countries
Authors: Fridlib Eugen
Published: March 2023

At least 10 million square meters of dwellings have been built in Ukraine per year. Most of them are residential complexes in cities. What is the level of acoustic comfort in these buildings? What are the main complaints of residents? We will answer these questions in this report. The
most popular partitions and floors types, their main problems and methods how to improve sound insulation will also be shown. We will analyze the requirements of national standards and assess how modern houses meet these requirements. This article shows the acoustics characteristics of many
structures measured on site, taking into account various flanking transmission pathways. Particular attention is paid to additional insulation structures that are used in apartments, to the differences between laboratory measurements and field measurements.
Numerical investigation of the effects of model and operator uncertainties on component-based transfer path analysis methods with substructuring applied to aircraft-like components
Authors: Prenant Simon , Padois Thomas , Dupont Thomas , Doutres Olivier
Published: March 2023

Hydraulic pumps are considered to have a major contribution to the structure borne noise generated inside aircrafts. Methods such as Component-Based Transfer Path Analysis (CB-TPA) are promising tools for aircraft manufacturers to build internal processes for the specification, design
and validation of the impact of vibrating systems on new aircrafts. However, the experimental applicability of these methods remains limited due to some experimental difficulties. CB-TPA' formulation is based on dynamical quantities, which require the determination of terms related to rotational
degrees of freedom. Virtual Point (VP) or Equivalent Multi-Point Connection (EMPC) methods are commonly employed for this purpose, but both result in more cumbersome experimental set-ups and increased measurement uncertainties. The implementation of these methods is difficult in the case of
a flat and thin receiving structure as commonly encountered in aircraft applications, since in-plane translational excitations have to be applied and the access to the vibrating system/structure interface points is limited. In this work, a decoupling procedure is used to overcome these issues.
A numerical model is used to investigate the influence of model and operator uncertainties on the CB-TPA' predictions, when the dynamical quantities are provided by VP and EMPC methods including the decoupling procedure.
Field Validation of Octave Band Sound Modeling for Wind Turbines
Authors: Lodico Dana
Published: March 2023

The Sugar Creek Wind Project is a 57-turbine wind farm in Logan County, Illinois, with a capacity of up to 202 megawatts. Preconstruction sound modeling of the final Project layout was conducted in July 2019. Following construction of the Project, postconstruction attended sound measurements
were made at 38 sites in the vicinity of Project turbines in September, October, and November 2021. Measured postconstruction sound levels were compared to the octave band sound level limits applicable under the Project's Conditional Use Permit. A comparison of the modeled and background-adjusted
measured octave band sound levels for the Project indicate that with the proper modeling parameters, octave band sound levels can be conservatively predicted.
The quality of green spaces in Cáceres (Spain) when compared to those in other cities
Authors: Rey Gozalo Guillermo , Barrigón Morillas Juan Miguel , Montes González David , Iglesias-Merchan Carlos , Aumond Pierre , Vílchez-Gómez Rosendo , Atanasio Moraga Pedro , Pérez Pintor José Manuel , Muñoz Bermejo Laura , Merino-de-Miguel Silvia
Published: March 2023

According to the policies of the European Union, the increase of green spaces is proposed by city managers in their programmes because of their benefits on the well-being and quality of life of citizens. Urban parks can also bring economic and environmental advantages. However, the
extent of new green space is limited in increasingly densely populated cities. Therefore, small green spaces isolated or, even better, connected through pedestrian zones are becoming more and more common. The city of Cáceres plans in the coming years to increase the number of green
spaces, the connectivity between them and the pedestrian areas. In this sense, if different indicators for the quality of these areas are not considered, the obtained results may not be as good as expected. We believe that the sound environment is a key factor in the quality of these spaces.
In this study, the situation of some green areas in the city of Cáceres is compared with that of other cities in order to quantify their quality.
A study on the new PET composite sound-absorbing material applicable to automotive interior materials
Authors: Yong Sukjun , Park JangSeok
Published: March 2023

Various types of sound-absorbing materials are used in vehicles according to external noise and conditions. As sound-absorbing materials for automobiles, there are fiber-type materials such as PET fiber or glass fiber, and foam-type materials such as polyurethane. Among them, PET fiber
materials have excellent advantages in terms of weight reduction and recycling, but urethane foam is applied due to their low NVH performance and compressive stress. Recently, as interest in eco-friendly vehicles increases, development of sound absorbing materials using PET fiber is required.
To improve this problem, in this study, research was conducted on improving sound absorption performance and compression performance by changing the composition ratio of PET fibers constituting the sound absorption material. The acoustic properties were measured by ALPHA-CABIN and BUCK tests
Subjective studies on floor impact sound using headphone
Authors: Hirakawa Susumu , Sato Hayato , Chikai Manabu , Hiramitsu Atsuo , Sato Hiroshi , Mahn Jeffrey , Mueller-Trapet Markus , Batista da Cunha Iara
Published: March 2023

Due to the pandemic situation, it become complex to conduct subjective experiments in the anechoic chamber as a result of the lockdown. For this situation the procedure for the subjective experiments without accessing to the anechoic chamber needs to be considered for an alternative
approach. The previous study has shown that there are good correlation between the laboratory and online listening test on impact sounds in residential buildings using ambisonic microphone recording with headphone. Hence, further subjective experiments were carried out with monaural and binaural
microphone recordings in an experimental buildings in Japan. The subjective experiment using a headphone in anechoic chamber was held in AIST, Japan. The 3 different floor types, 2 different types of microphones (mono and binaural), at 12 different combinations of impact sources, excitation
positions and microphone positions were tested. This study also provided some evidence, and suggested there are potential of the online/remote subjective experiment using headphone.
Extension of frequency range of the sixteen-microphone method in normal-incidence sound transmission loss measurement.
Authors: HIROSHI NAKAGAWA , Sanada Akira
Published: March 2023

This study deals with development of a high-frequency measurement method of normal incidence sound transmission loss using acoustic impedance tube. On ordinary transfer-function method, measurable frequency of the method is limited by the diameter of the tube. Authors have developed
8 microphone method to measure normal incidence absorption coefficient. This technique lays 4 microphones on the same cross section and cancels rotational acoustic modes. This makes it possible to measure normal incidence absorption coefficient up to 3 times the upper frequency of the ordinary
2 microphone method. In this study, authors apply the same technique to normal incidence transmission loss measurement.
Nonlinear response of laminar premixed flames to dual-input harmonic disturbances
Authors: Jiang Xiaozhen , Li Jingxuan , Yang Lijun
Published: March 2023

In gas turbines, aero-engines and rocket engines, flames are always disturbed by perturbations of dual or multiple harmonic frequencies, resulting in corresponding combustion instability. This paper analyses the nonlinear response of laminar premixed flames to dual-input harmonic disturbances
to further understand those associated combustion instability. Nonlinear results of flame dynamics were derived from analytical and numerical solutions of the G-equation. The spatial front-tracking of premixed flames was obtained, where types of nonlinear behaviors were classified and related
mechanisms of that were elucidated. A dual-input flame description function (DIFDF) was proposed to separately determine global nonlinearities of flame responses of fundamental and higher harmonics frequencies under dual-input disturbances. The fundamental frequency response consists of linear
and nonlinear components, and the higher harmonic frequency one is purely nonlinear. The DIFDF properties of conical and "V" flames were compared, with particular emphasis on their differences in nonlinear behavior. The spatial and global effects of the second input frequency on
the flame kinematics perturbed by the first frequency were also clarified. Furthermore, the roles of perturbation amplitude and flame height in spatial flame dynamics and DIFDF were quantified.
Implementations of wireless active noise control in the headrest
Authors: Shen Xiaoyi , Shi Dongyuan , Peksi Santi , Gan Woon-Seng
Published: March 2023

Working from home went from a temporary result of the pandemic to a way of life. However, peace and quiet are hard to come by. To get rid of distraction, Active Noise Control (ANC) particularly the ANC headphones are widely used to attenuate the undesired noise in daily life. While
it works, the prolonged usage of headphone can cause some discomfort. This work describes a wireless ANC system implementation designed for the headrest to reduce the noise distraction while doing away with discomfort caused by prolonged usage of headphone. Wireless microphones are utilized
to pick up the noise with a high reference-to-interference ratio, which helps in improving the noise reduction performance of the ANC headrest. This paper investigates the feedforward, feedback, and hybrid ANC structures' noise reduction performances in the ANC headrest. Comparative experimental
results shown in this paper indicate the effectiveness of the proposed approach in reducing noise around the headrest.
Distance control of virtual sound source based on switching electro-dynamic and parametric loudspeaker arrays
Authors: Hirose Ayano , Wang Haonan , Nakayama Masato , Nishiura Takanobu
Published: March 2023

High presence sound field reproduction technology has recently gained attention. We have previously proposed a virtual sound source (VSS) construction method based on wave field synthesis (WFS) using parametric loudspeaker array (PAL array). The previously proposed method can construct
the VSS at any position without relocating the PALs. However, the previously proposed method has difficulty constructing the VSS near the PAL array. In this paper, we propose a new method to control the distance of a VSS based on WFS using an electro-dynamic loudspeaker (EDL) array and a PAL
array. The EDL array is suitable to construct VSSs near the loudspeaker array. In contrast, the PAL array is suitable to construct VSSs far away from the loudspeaker array. Therefore, in this method, we place an EDL array and a PAL array parallel to each other and switch the loudspeaker array
for VSSs construction depending on the desired position to realize VSS distance control. The threshold of switching loudspeaker array is determined by a subjective preliminary experiment. We demonstrated the effectiveness of the proposed method through evaluation experiments.
Objective evaluation of multipurpose enclosures equipped with active acoustic enhancement systems
Authors: Blasinski Lukasz
Published: March 2023

Research on optimal acoustic parameter values that have been carried out for recent decades and the necessity to provide different acoustic solutions to events of a different type led to construction of rooms with variable acoustic conditions. Nowadays, active acoustic enhancement systems
(AAES) become more and more popular. Application of such systems allows adjustments of acoustic parameters required for particular performance. This paper presents results from measurements of objective parameters of multipurpose enclosures equipped with AAES. Investigated halls are located
in Poland in the following cities: Łańcut, Mińsk Mazowiecki, Puławy, Wieluń and were intentionally built or renovated as multipurpose rooms. All of those halls were equipped with Yamaha AFC version 3 system. The measurements were performed according to ISO338-1/2
standards. In total 13 active acoustic system settings (presets) were analyzed to investigate their influence namely Reverberation Time (RT), Early Decay Time (EDT), , Initial Time Delay Gap (ITDG), Center Time (Ts), Clarity (C80, C50), Definition (D50), Interaural Cross Correlation (IACC)
and Speech Transmission Index (STI). The analysis of the obtained results showed that it is possible to obtain the appropriate acoustic conditions with acoustic parameters values set in the suggested range for a given event using active acoustic systems.
Apparent wood elements and acoustic performance - Feedback from Adivbois CLT building mockup
Authors: Guigou Carter Catherine , Balanant Nicolas , Kouyoumji Jean-Luc
Published: March 2023

The acoustic performance of a CLT based building mockup was investigated within the scope of AdivBois acoustic technical commission with the objective of defining wood building constructions fulfilling requirements. The CLT based building is a three floor construction, with four rooms
on each level. Acoustic measurements from junction characterization to air-borne and impact sound insulations have been performed. Apparent wood is supposed to have positive effect on health and well-being on building occupants. This paper concentrates of the effect of apparent wood on the
acoustic performance : the apparent wood can be either the underside of the CLT floor (i.e., no suspended ceiling) or posts and beams possibly continuous between different rooms. The measured results are discussed with respect to prediction. A simple approach to take into account the through
beams or posts is proposed. Recommendations concerning apparent wood elements in buildings are imparted.
Unsteady FW-H Simulation of the Aerodynamic Noise of a High Speed Train Bogie
Authors: Rissmann Martin , Leneveu Romain , Chaufour Claire , Clauzet Alexandre , Aubin Fabrice
Published: March 2023

Aerodynamic noise is generated by interaction of the air flow with an object and within the turbulent flow itself. In railways it becomes an important noise source for speeds above 250 kph and major areas of noise generation on trains, in particular high speed trains, are the train
head, the leading and second bogie, the pantograph and the gaps between trailers. In this presentation a numerical simulation approach based on CFD/CAA techniques aiming to predict aerodynamic noise of different components of SNCF's TGV high speed trains. The approach is based on an unsteady
DES flow simulation combined with the Ffowcs-Williams and Hawkins (FW-H) analogy for the acoustic part. In order to develop the method different models are implemented and the leading bogie was selected as an application case. A simplified symmetric model will be compared against a full, higher
resolved model in order to see if computation time gains are feasible. Results of this simulation, in terms of sound power and directivity, are already used by SNCF noise experts in order to estimate pass-by noise levels of TGV high speed trains. Furthermore, noise mitigation solutions can
be tested virtually with the suggested approach before being tested with a prototype.
Unified low-order modeling approach to can-annular combustors
Authors: Pedergnana Tiemo , Noiray Nicolas
Published: March 2023

We present a unified, physics-based low-order modeling approach to can-annular combustors, combining a linear stability analysis and a nonlinear Langevin approach to unravel the highly complex, multi-physical dynamics in this type of system. In the linear part, Howe's Rayleigh conductivity
model is combined with the projected Helmholtz equation and a Bloch wave ansatz to arrive at a single equation for the frequency spectrum of an N-can combustor. Starting from first principles, we illustrate and give a physical explanation for the coupling-induced amplification and suppression
of thermoacoustic instabilities. Adding another layer of complexity, we then take into account nonlinearities in the flame response and the aeroacoustic coupling. The nonlinear dynamics of a symmetric model combustor are explored by exploiting the gradient structure of the averaged slow-flow
dynamics. We obtain exact analytical expressions for the steady-state statistics, highlighting the connection between different emergent patterns and the resistive coupling between the cans. We leverage our analysis to explain the intermittent energy transfer between Bloch modes observed in
real-world gas turbines.
Reflections on burden of disease and health impact assessment methods for noise
Authors: Röösli Martin , Vienneau Danielle
Published: March 2023

Burden of Disease (BoD) assesses the noise impact on health at a given time and in a given population, whereas Health Impact Assessments (HIA) are conducted in the frame of decision-making to evaluate health effects of a policy, programme or project. In a 2020 report, the European Environmental
Agency estimates transportation noise exposure in Europe annually results in 22 million highly annoyed, 6.5 million highly sleep disturbed, 48,000 cases of ischemic heart diseases and 12,000 deaths, and 12,400 children with cognitive impairments. These are based on END exposure assessment
and exposure-response functions from the WHO noise guidelines 2018. Many more regional or national HIA and BoD studies have been conducted, and common methods across future assessments for consistent communication are needed. Given the rapid developments in noise research, current BoD and
HIA are also partly outdated. Critical methodological issues will be discussed using national and regional examples with a focus on Switzerland. This includes the selection of noise sources, relevant health outcomes and corresponding exposure-response functions. Derivation of the lowest effect
noise threshold, potential double-counting, and communication of results are also discussed with the aim toward a common understanding for the conduct of future BoD and HIA.
Sound source distribution of high-speed trains and reduction of aerodynamic bogie noise
Authors: Uda Toki , Akutsu Mariko
Published: March 2023

When the Shinkansen train runs at a high speed more than 300 km/h, the contribution ratio of the aerodynamic noise generated from bogies to the total wayside noise is as large as 30%. This is because the aerodynamic noise is proportional to the 6th power of the train velocity. RTRI
has designed and made a large new microphone array with a diameter of 3m easy to install in the wayside of the railway. By applying the latest deconvolution algorithm to improve the spatial resolution of sound sources, it was found that the most prominent noise sources distribute around the
train nose, pantographs and bogies. Because Japanese environmental standards impose to evaluate the A-weighted maximum noise level at the point 25m apart from the nearest truck after applying time-weighting, S, the aerodynamic bogie noise needs to be reduced. For this reason, we conducted
a wind tunnel test to develop countermeasures to reduce aerodynamic bogie noise. As a result, several measures are found to be effective.
Sketching sound in architectural design using Virtual Reality
Authors: Nedlich Kristin , Nykänen Arne , Hellström Björn
Published: March 2023

A sketch is an important tool that architects use to visualize and formulate design decisions. The sketch process is a crucial stage where design iterations and decisions can be made fast, easy and abundant. Sketching facilitates idea spawning, design assessment, modification and communication.
This exploratory study focuses on qualities with Virtual Reality that can be used for sketching sound in the architectural design process. The study was influenced by Contextual Inquiry Interviews and used trained architects as respondents. The main result of this study is a summary of the
pros and cons on how Virtual Reality work today and discusses how to develop a test bed for future research. One of the main cons, as of now, is the bulkiness of the equipment and the fact that it is not intended for sketching sound, yet. Computing speeds and acoustic rendering is another
issue on the technical side. A possible benefit of using Virtual Reality is that it gives architects the possibility of incorporating sound in the architectural design process, thus making it an integral part of the practice.
speaker performance on sports performance -Behavior analysis using OpenPose
Authors: Miharu Satoshi
Published: March 2023

Most of the sound quality evaluation methods for loudspeaker are based on physical evaluation and subjective evaluation. In the physical evaluation, we focus on the peak sound pressure and the rise speed. In the subjective evaluation, the sound quality is evaluated by the subjective
evaluation experiment using the sound quality evaluation word. However, it's difficult for people who don't have professional knowledge in the field of acoustics to judge the performance of a loudspeaker from these evaluation methods. In addition, according to the engineers of a speaker manufacturer,
the difference of the sound quality of the loudspeaker may affect the movement and motivation of the game. In this study, aims to evaluate the sound quality of loudspeaker objectively from a new point of view. In order to clarify whether the difference of the sound quality of the loudspeaker
affects the movement, the movement analysis using OpenPose was carried out. As a result, it was found that the complicated motion was not likely to be affected by the difference of the sound quality of the loudspeaker. However, the results suggested that simple and familiar actions may be
affected by the difference in loudspeaker sound quality.
On the Optimization of Sonic Crystal Acoustic Noise Barriers
Authors: Ramírez-Solana David , Redondo Javier , Fanti Maria Pia , Mangini Agostino Marcello , Galiana-Nieves Jaime
Published: March 2023

Acoustic noise barriers based on sonic crystals constitute one of the most promising innovative bets of recent years in the field of environmental noise control. Sonic crystals are defined as metamaterials formed by periodic arrays of acoustic rigid scatterers embedded in a fluid (usually
air). Furthermore, Helmholtz resonators can be added with the purpose of increase the acoustic isolation of the barrier. Helmholtz resonances and multiple scattering are both noise control mechanisms of the sonic crystal noise barrier (SCNB). During last decades several authors have used genetic
algorithms to optimize the performance of these devices showing its huge potential. In this work we present new strategies in order to improve the performances of the approaches presented in the related literature.
Dilatation wave velocities estimated from the plateau in sound insulation of cross-laminated timber (CLT) plates
Authors: Churchill Claire , Nusser Bernd , Lux Christian
Published: March 2023

There are four inherent problems when predicting the airborne sound insulation of cross-laminated timber (CLT) plates. (1) The internal loss factor of wood products is high and therefore difficult to measure using the structural reverberation time technique. (2) Solid wood is a low-density
building material compared to reinforced concrete or masonry construction. (3) Timber is orthotropic. (4) Orthotropic behaviour includes low shear moduli. CLT plates, similarly to thick masonry or concrete plates, exhibit thick plate behaviour in the high frequency range (f>1600Hz). The
high frequency sound insulation data of nine plates is examined. Transitions to a thick plate seems to occur in all measurements. However, a clearly observable plateau is only visible for six of the nine plates. Simple methods are applied to extract information about the CLT plates from this
high frequency (f>1600Hz) measured data. The data extracted from the plate is compared to typical values for equivalent isotropic plates, where the bending stiffness is assumed to be B_iso=√(B_x B_y ). The results are discussed in the context of laboratory measurement of sound insulation.
Modelling of piano string vibration using coupled mobilities and a state-space approach
Authors: Miranda Pablo , Squicciarini Giacomo , Thompson David. J
Published: March 2023

In musical acoustics a double decay can occur if there are two decay slopes in the sound envelope with the second part of the time history having a less pronounced slope than the first. In piano strings the double decay can be caused by the differences between the decays of vibration
in the two transverse directions of a single string: normal and parallel to the soundboard. Herein we aim to reproduce this phenomenon by coupling a stiff string model and the soundboard, in both frequency and time domain, using mobility coupling and state-space model approaches. The dynamics
of a stiff string tensioned between the two end pins but disconnected from the soundboard bridge is first studied. The two transverse directions of vibration are assumed to be uncoupled due to symmetry. On the contrary, the soundboard mobilities at the point of connection with the string can
be represented by a multidimensional (2x2 in this work) and fully populated matrix implying coupling between different directions. The string and the soundboard will be connected by means of frequency and time domain models to show the importance of the cross-mobility terms on the vibration
response and double decay of the string.
A model of the rotating rigid wheelset and its influence on the wheel and track rolling noise
Authors: Andrés Víctor T , Martínez-Casas José , Denia Francisco D , Squicciarini Giacomo , Thompson David J
Published: March 2023

The dynamic and acoustic behaviour of the railway wheel is defined by its numerous vibration modes and natural frequencies. The modes whose contribution to the rolling noise radiation are predominant generally have 2 or more nodal diameters and appear above 2 kHz. The vibration due
to these modes is decoupled from the rest of the wheelset, allowing the wheel to be treated separately. The error produced in the wheel noise prediction by this treatment appears at the low and medium frequencies and is negligible since the wheel emission occurs mainly at the high frequency
range. However, given the dynamic coupling between the wheel and track, the changes in the dynamics of the former affect the latter, whose radiation is predominantly in the low and medium frequency range. Therefore, in order to correctly study both elements, it is necessary to include the
contribution of the rest of the wheelset in the wheel response. In this work, this contribution is introduced through an analytical approach considering the rigid body motion of the wheelset and a benchmarking against an equivalent numerical formulation is carried out for validation purposes.
In addition, the inertial effects associated with the rotation under straight circulation conditions are considered.
Turbulent scattering in upwardly refracting atmospheres : towards a practical approach
Authors: Van Renterghem Timothy , Horoshenkov Kirill
Published: March 2023

Neglecting turbulent scattering when modelling sound propagation in an upwardly refracting atmosphere leads to unrealistically low levels. Engineering models then typically impose a distance independent constant value for the sound pressure level relative to free field propagation.
However, such an approach neglects the strong temporal variability in level one might observe in such an acoustic shadow zone, depending on whether the atmospheric boundary layer is either strongly or weakly scattering. In this work, a modelling framework is presented to account for the effect
of such changing scattering contributions, showing that level variations might be as large as 20 dB in such zones. This work contributes to predicting more accurate long-term sound pressure level distributions e.g. near wind turbines.
Advertisement in Business through Social Media
Authors:   Departemen Manajemen, Universitas Komputer Indonesia, Indonesia, Windi Novianti Windi , Erdiana E ,   Departemen Ilmu Komunikasi, Universitas Komputer Indonesia, Indonesia
Published: March 2023

This study aims to determine the benefits of social media as a supporter of advertising activity in a business. This study used descriptive qualitative method with literature study by collecting a variety of data related to what is researched, then analyze and summarize so that researchers can explain what are the benefits of social media that can support the advertising activities. Results from this study is the social media provides many benefits to the business world and can be made in one of the media that support the advertising activities for a business. Nowadays anyone can do a business and expand global business network by simply using social media.
E-Payment Systems in Selling Product
Authors:   Departemen Manajemen, Universitas Komputer Indonesia, Indonesia, Soegoto Eddy Soeryanto , Rahman R A ,   Fakultas Teknik dan Ilmu Komputer, Universitas Komputer Indonesia, Indonesia
Published: March 2023

The purpose of this study is to examine the importance of technology in business, especially in terms of transactions. The method used in this study was a descriptive method by reading from various international and domestic journals. The results of this study were identification of how simple and important technology was in influencing payment systems that were slowly changing from conventional to electronic payments (e-payment). We also discussed what information related to e-payment, such as safety, functions, and available features from using this e-payment system.
Marketing Strategy in Travel Agency
Authors:   Departemen Manajemen, Universitas Komputer Indonesia, Indonesia, Soegoto Eddy Soeryanto , Nugroho A H ,   akultas Teknik dan Ilmu Komputer , Universitas Komputer Indonesia, Indonesia
Published: March 2023

The purposes of this research are to describe, analyze, and determine the online marketing strategy of domestic travel agent at Bandung Tour Expert. In this case, the authors focused on SWOT analysis to find out the right marketing strategy for the tour packaging. In this research, the data was collected using the observation method, meanwhile the data analysis method used were descriptive qualitative and SWOT analysis. Internet users number are increasing, especially adults with high mobility. For them who often travel outside the city, internet is crucial because it connects them with the travel agent. Nowadays, the convenient use of Internet technology is used to market products and services offered by travel agents, so that it provides many benefits for business travel agents with minimum marketing costs. The results of this study were the use of internet and online marketing had impacts on the increasing profits of the travel agents. The conclusion of this research is Bandung Tour Expert as a company need to improve their variant of tour package to make tourist more interest to visit the company website.
E-Commerce on Fashion Business
Authors:   Departemen Manajemen, Universitas Komputer Indonesia, Indonesia, Soegoto Eddy Soeryanto , Badria S G ,   Departemen Sistem Informasi, Universitas Komputer Indonesia, Indonesia
Published: March 2023

The purpose of this study is to identify developments and opportunities by using technology as well as the benefits of e-commerce on the fashion business. To support this research, this study used a descriptive method by describing the situation. The results of this study show the extent of technological developments and opportunities on the fashion business. This study also discusses the ease the use of e-commerce for sale fashion products that will be carried out by companies using e-commerce technology.
Social Survey on Product Development
Authors:   Departemen Manajemen, Universitas Komputer Indonesia, Indonesia, Iffan M , Shafira N ,   Departemen Sastra Inggris, Universitas Komputer Indonesia, Indonesia
Published: March 2023

The purpose of this study is to describe the advantages of social survey for the product development based on market research. The method used in this study was a qualitative method in which the data presented are data from phenomena. The results of this study proved that Web-based survey had advantages to the users as consumers viewed through how the survey team gave rewards to users after finishing surveys, the features of the web and users would help the companies by their surveys. The conclusion obtained in this study is relationships between other companies, survey teams and users as consumers have benefit to each other.
Digital Transactions in Business
Authors:   Departemen Manajemen, Universitas Komputer Indonesia, Indonesia, Iffan M , Khoir K A ,   Departemen Akuntansi, Universitas Komputer Indonesia, Indonesia
Published: March 2023

The purpose of this research is to provide innovation and analyze transaction efficiency in traditional markets using digital technology to generate new business opportunities. This research uses library research methods, using data collection techniques by reading, recording, and processing existing data. In the digital age, traditional markets are increasingly less in demand by different groups of people, especially by the millennium for various reasons such as dirty, muddy, hot, and coupled with strong odors. The result of this research is that with the development of digital technology today, it cannot be denied that traditional markets must innovate to overcome competition. With digitalization in traditional markets, Millennial generation and various groups of people are expected to be able to transact more easily in traditional markets. This digital transaction can promote and prosper traders in traditional markets, and make traditional market traders independent in marketing their products.
APPLICATION OF BIM-TECHNOLOGIES TO SOLVE THE PROBLEMS OF MAINTENANCE AND REPAIR OF BUILDINGS AND STRUCTURIES
Authors: Kuznecov S. , Knyazeva N.
Published: March 2023

Currently, there is an active development of digital technologies in the construction sector. One of the main directions of digitalization of construction is the use of building information modeling technologies (BIM) at all stages of the life cycle of buildings and structures. The principle of using these technologies is the complex processing of geometric and attribute information about the object, its elements and its application to solve design, construction and operational tasks. The pace of BIM implementation at the operational stage is lagging behind, but the interest of asset owners is growing in the possibilities of reducing the complexity and improving the efficiency of building maintenance by organizing a centralized repository of up-to-date and reliable information about the object based on an information model. In this article, the operational formation of defect certificates and statements of necessary material and technical means intended for routine repairs is considered, as one of the directions of application of the information model for solving maintenance and repair tasks. The traditional approach to working with these documents is associated with the repeated entry of repetitive information into data accounting systems, and sometimes with handwritten forms and the lack of the possibility of simultaneous work of all participants on documentation. The proposed approach to electronic reporting will make it possible to reduce the amount of routine work of the maintenance service specialists and eliminate errors related to the human factor in the preparation of reports.
INVESTIGATION OF THE INFLUENCE OF THE CAPILLARY STRUCTURE OF A THERMOSIPHON ON ITS THERMAL POWER WITH HEAT CARRIERS R134a, R410a, R407c
Authors: Timofeev A.
Published: March 2023

Thermosiphon (TC) is an evaporative-condensing heat exchange device, where the circulation of the working fluid (intermediate coolant) is carried out due to gravitational forces. There is no porous wick in thermosiphons, it is replaced by grooves of various geometric shapes. Structurally, thermosiphons are made in the form of hermetically sealed and elongated cylindrical vessels, the inner volume of which is filled with a working fluid. Liquid heat carriers are used as the working fluid, which can perform an aggregate-phase transition at operating temperatures observed during operation in a recuperative heat exchanger. In this article, author is talking about comparing the limits of thermal power of thermosiphons operating at operating temperatures of ventilation and air conditioning systems. At the same time, thermosiphons use freons R134a, R410a, R407c as the working medium, and the capillary structure of thermosiphons is represented in the form of grooves of the following types: a Ω –shaped groove, a rectangular groove and a triangular groove. For comparison, a thermosiphon with an outer diameter of 8 mm is used. The dependences of the thermal power on the operating temperature for all types of limitations of the heat transfer capacity of thermosiphons are presented, depending on the capillary structure used and the working fluid. The analysis of the best capillary structure of thermosiphons when using freons as a working body is carried out.
MODEL OF THE SUB-CENTER OF THE ST. PETERSBURG AGGLOMERATION (ON THE EXAMPLE OF NOVOSARATOVKA VILLAGE). DEVELOPMENT CONCEPT OF THE CITY CENTER
Authors: Zima A.
Published: March 2023

Within the framework of this article, a pre-project urban planning analysis is carried out, including a situational analysis at the level of the St. Petersburg agglomeration, the Vsevolozhsky municipal district; a comprehensive analysis at the level of the Sverdlovsk urban settlement, the village of Novosaratovka and the territories adjacent to it. In result of the synthesis of the main characteristics of the territory, identified by the comprehensive urban planning analysis, a scheme of the modern use of the territory is drawn up. A unified «sub-center model» has been developed on the example of Novosaratovka with the possibility of its application in the integrated development of identical territories in the peripheral regions of the St. Petersburg agglomeration. The sub-center model is represented by four interrelated components: ecological (the basis for other components), public, comfortable living environment and a modern system of transport mobility. The disclosure of such an important component of the model as a public is considered as part of the formation of a conceptual proposal for the development of the territory of the proposed city center of the sub-center - the village of Novosaratovka (according to the author's proposal). The prerequisites of the concept and its structure (framework) – «cores» and connections in such areas as social and business (business, scientific clusters) and socio-cultural (cultural, sports clusters) with their characteristics are described. A town-planning design proposal for the territory of the city center has been presented.
Avaliação da assistência à sáude voltada à diabetes desenvolvida na atenção básica
Authors: da Silva Cristiano Signorini Laitarte , Ferreira Ítalo Cordeiro , De Oliveira Filho Jadir Lopes , Melo Leonardo Amaral de Almeida , Da Cunha Sérgio Augusto Siqueira , Castro Victor Emanuel Fernandes Costa Matias , Aires Francinelly Ribeiro dos Santos
Published: March 2023

Introdução: Diabetes mellitus é uma doença crônica não transmissível, sendo uma das principais causas de hospitalizações no SUS e de mortalidade, devido suas complicações crônicas e agudas. Objetivo: Realizar um relato de experiência a respeito da assistência ofertada aos pacientes portadores de diabetes atendidos em uma unidade básica de saúde do município de Porto Nacional-TO. Metodologia: Relato de experiência realizado na Unidade Básica de Saúde Maria da Conceição Pereira da Silva (Ceiça). Por se tratar de um relato de experiência relacionado ao cotidiano do serviço, este trabalho dispensou a submissão ao Comitê de Ética em Pesquisas com Seres Humanos, porém, seguindo as normas éticas, procurou-se manter em sigilo o nome dos profissionais da UBS, além da não divulgação dos nomes de pacientes. Resultados: Durante as observações realizadas a respeito dos atendimentos disponibilizados para os pacientes com diabetes, atendidos na UBS Ceiça, foi possível verificar que o acolhimento aos pacientes, inicia-se pela equipe administrativa, em seguida, o paciente é encaminhado à sala de enfermagem para avaliação inicial e orientação sobre o estilo de vida saudável e logo após para atendimento médico. Considerações Finais: Aos pacientes portadores de diabetes, o médico costuma solicitar exames laboratoriais de rotina, sendo que em alguns casos, solicita também exames complementares, como fundoscopia e eletrocardiograma. O tratamento baseia-se no medicamentoso e não medicamentoso, sendo que o tratamento medicamentoso é ofertado ao paciente pela rede, conforme padronização do Ministério da Saúde, feito através da tabela Rename.
Prediksi Kecocokan Jurusan Siswa SMK Dengan Support Vector Machine dan Random Forest
Authors: Kardono Dicka Y , Pranoto Yuliana Melita , Setyati Endang
Published: March 2023

SMK Antartika 1 Sidoarjo setiap tahunnya melakukan penerimaan siswa baru. Siswa SMP yang mendaftakan diri ke SMK Antartika 1 Sidoarjo rata-rata belum cukup mengetahui tentang minatnya pada jurusan yang ada di sekolah. Adapun jurusan yang ada di SMK Antartika 1 Sidoarjo adalah Teknik Pemesinan, Teknik Kendaraan Ringan, dan Rekayasa Perangkat Lunak. Dari permasalahan di atas, maka diperlukan sebuah sistem untuk memprediksi tentang pemilihan kecocokan jurusan pada siswa baru SMK Antartika 1 Sidoarjo. Dengan adanya sistem tersebut dapat membantu meningkatkan pelayanan terhadap siswa baru dalam memutuskan pemilihan jurusan yang terdiri dari 4 tingkatan, yaitu: sangat cocok, cocok, kurang cocok, dan sangat kurang cocok dengan siswa. Untuk mengetahui pola prediksi dari data siswa tersebut, menggunakan penerapan perbandingan menggunakan metode Support Vector Machine (SVM) dan Random Forest (RF). Fitur atribut yang digunakan ada 14 fitur yang terdiri dari: Jurusan, Pendidikan_Ayah, Penghasilan_Ayah, Pendidikan_Ibu, Penghasilan_Ibu, Transportasi_ke_Sekolah, NUS_MTK_SMP, NUS_BIND_SMP, NUS_BING_SMP, Disiplin, Tanggung_Jawab, Sikap, Komunikasi, dan Output_Kelas. Riset ini menggunakan dataset siswa SMK Antartika 1 Sidoarjo mulai tahun 2020 sampai 2022 dengan total 578 record data siswa. Berdasarkan hasil analisis dengan metode SVM dengan kernel sigmoid diperoleh tingkat akurasi sebesar 83%, sedangkan hasil analisa dengan dengan metode RF dengan jumlah tree 150 diperoleh tingkat akurasi sebesar 82%.