Yo Fujiso

• PhD in Aeroacoustics
• Engineer at Inserm and Strasbourg University

Swallowing is a complex physiological function that can be studied through medical imagery techniques such as videofluoroscopy (VFS), dynamic magnetic resonance imagery (MRI) and fiberoptic endoscopic evaluation of swallowing (FEES). VFS is the gold standard although it exposes the subjects to radiations. In-vitro modeling of human swallowing has b...

The current paper considers physical speech screening by supplying air to a rigid replica based on oral tract volume reconstruction of a speaker uttering phoneme /s/ (Reynolds number about 5300). Radiated acoustic pressure spectra were measured for different flow conditions upstream from the reconstructed portion: Reynolds number (2800, 5300, 8900)...

Speech screening of sibilant fricative phonemes is an important tool for oral health care. Nevertheless, screening as a function of quantitative geometrical markers is mostly limited to teeth features whereas the minimum area of the narrowed air passage upstream from the tooth is known to be a key production feature. The minimum area is estimated f...

The PetaFlow application aims to contribute to the use of high performance computational resources forthe benefit of society. To this goal the emergence of adequate information and communication technologies withrespect to high performance computing-networking-visualisation and their mutual awareness is required. Thedeveloped technology and algorit...

Sibilant fricative sound production depends on the geometric and flow properties of the production system. Nevertheless, few studies deal with the potential impact of flow properties other than the inlet volume flow rate on the noise produced. In this work, an experimental study is presented using a replica based on a reconstructed oral cavity for...

Airflow through the human upper airways is essential for life and for oral communication. In studies dealing with human speech production, airflow is mostly severely simplified. Nevertheless, this airflow is complex owing to turbulence and extreme sensitivity to boundary conditions. Recently, deeper attention has been given to characterize the airf...

Airflow through the human upper airways is essential for life and for oral communication. In studies dealing with human speech production, airflow is mostly severely simplified. Nevertheless, this airflow is complex owing to turbulence and extreme sensitivity to boundary conditions. Recently, deeper attention has been given to characterize the airf...

The Petaflow project aims to contribute to the use of high performance computational resources to the benefit of society. To this goal the emergence of adequate information and communication technologies with respect to high performance computing-networking-visualisation and their mutual awarness is required. The developed technology and algorithms...

Moving the simulation results produced by thousands of computing cores to the scientist office is not anymore an option. Remote visualization proposes to perform heavy duty postprocessing tasks at the computing center while transferring images to the scientist. To be effective, such environement needs to be flexible and interactive. Data loading fr...

In the study of aerodynamic noise, a tackling challenge is to understand the underlying aeroacoustic mechanisms leading to its generation. The current paper aims at contributing to the noise characterization by focusing on moderate Reynolds number (100 ≤ Re ≤ 10000) airflow circulating through a rectangular channel containing a trapezoidal obstacle...

Human unvoiced fricative speech sounds such as [s] and [f] are produced by a complex fluid-structure interaction. Indeed, a moderate Reynolds number (100 ≤ Re ≤ 10000) turbulent jet is issued from a constriction somewhere in the vocal tract formed between the hard palate and an articulator such as tongue, teeth, or lips. By using simplified in-vitr...

Unvoiced fricative speech production involves the noise produced by a complex fluid-structure interaction between a moderate bulk Reynolds number (100<Re<10000) turbulent jet issued from a constriction somewhere in the vocal tract with a downstream obstacle (i.e. articulators such as lips, tongue or teeth). To contribute to the physical study of hu...

Flow through an axisymmetrical parameterized contraction nozzle of limited size with area contraction ratio 21.8 and total length 6 cm is studied for moderate Reynolds numbers 300 < Re < 20,200. The transverse flow profiles at the nozzle exit are characterized by hot film anemometry for two different spatial step sizes. The flow at the exit is lami...

L'influence d'une contraction brusque à arêtes vives couplée à des tubes circulaires de faible L/D sur le développement aval d'un jet en champ proche est étudiée pour des nombres de Reynolds modérés.

L'écoulement à travers un convergent utilisé comme géométrie d'entrée pour des maquettes de conduit vocal montées dans un dispositif expérimental d'écoulement est étudié pour des nombres de Reynolds faibles à modérés. L'écoulement est expérimentalement caractérisé par de l'anémométrie film chaud en sortie du convergent. Les caractéristiques estimée...

A non-expensive insulation box for aero-acoustic experiments at moderate Reynolds numbers Re < 2 × 10^4 and low Mach numbers M < 0.2 is presented. Its performance is evaluated with particular attention to unwanted noise sources inherent to the flow facility. Objective acoustic parameters of the insulation box are assessed.

A non expensive sound insulation box used for aero-acoustic experiments at moderate Reynolds numbers (Re<2.10^4) and low Mach numbers (M<0.2) relevant to the study of speech production is presented. Its performance is evaluated with particular attention to unwanted noise sources inherent to the flow facility. Objective acoustic parameters of the in...

Flow through a contraction nozzle used as an inflow geometry for in-vitro vocal tract replicas mounted in an experimental flow facility is studied for low to moderate Reynolds numbers. The flow is characterised experimentally by hot-wire anemometry at the nozzle exit. The estimated boundary layer characteristics are used to validate Thwaites bounda...

In the field of Musical Acoustics, compared to the Acoustic Guitar, far less studies have been conducted about the Electric Guitar. It differs from its elder acoustic sister in many points: e.g. the electric guitar does not have any sound box; its sound should be radiated by an amplifier and not by the instrument directly; its strings are all steel...

Some perceptual and dynamical aspects of the electric guitar The electric solid body guitar was popularized by two American stringed-instruments makers: Leo Fender with his Telecaster (1950) and Stratocaster (1954), and Lester W. Polfuss with the Gibson Les Paul (1952). These guitars were used by the most famous guitarists of popular music, becomin...