• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.5 no.1
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• pp.69-74
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• 1994

Thyroplasty type III provides an effective mean of shortening the vocal fold. It is used primarily fer lowering vocal pitch. The indications for this surgery are the male patients with too high a vocal pitch of long duration which has proven resistant to voice therapy and a type of dysphonia characterized by high pitch and a breathy voice, in which the laryngeal findings include a very narrow glottal chink and a small amplitude of vibration, suggesting a stiff vocal cord. In this study, we have experienced two cases of high pitched voice, one is mutational falsetto and other is high pitched, breathy voice with stiff vocal fold. The results were satisfactorily successful with type III thyroplasty. So we report the cases of type III thyroplasty in patients of dysphonia with high pitched voice.

• 한국전산유체공학회:학술대회논문집
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• 2000.10a
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• pp.109-114
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• 2000

Mechanical agitation is widely used in industrial process engineering. In the present study, peformed was a numerical simulation on flows in a $45^{\circ}$ Pitched Paddle Type mixer. Through a CFD technique, effects of the position of the impeller on resultant flow pattern was studied. Results of computed torque on impeller to maintain the flow are also compared to the experimental data, and showed good qualitative agreements.

• Journal of Biomedical Engineering Research
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• v.39 no.3
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• pp.134-139
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• 2018

One of the most common problems with pedicle screw system is pullout of the screw. This study was performed to evaluate the pullout strength and driving torque of newly designed pedicle screws. The design of three type screws were standard pedicle screw, which had single lead threaded and single pitched design (Type A), single pitched and dual lead threaded pedicle screw (Type B), dual pitched and dual lead threaded pedicle screw (Type C), respectively. The tests were performed in accordance with the ASTM standards using polyurethane (PU) foam blocks. There was no significant difference in pullout strength among three types of screw. Type B and Type C exhibited higher insertion torque and removal torque than Type A, respectively (p<0.05). Pedicle screws newly developed with dual pitched and dual lead threaded design showed higher driving torque without decrease in pullout strength compared to the standard pedicle screw and could be inserted more rapidly with the same number of revolutions.

• Journal of Biomedical Engineering Research
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• v.42 no.1
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• pp.1-6
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• 2021

Recently, various types of pedicle screws have been developed considering the anatomical structure of the spine. The purpose of this study was to evaluate the pullout stiffness and strength of two types of commercial pedicle screws. The design of two type screws were single pitched thread (ST) pedicle screw and dual pitched thread (DT) pedicle screw, respectively. The tests were conducted in accordance with the ASTM standards using polyurethane (PU) test blocks which has anatomical structure of the spine. There was no significant difference in pullout stiffness between two types of screw. However, DT exhibited higher pullout strength than ST (p<0.05). Pedicle screw with dual pitched thread showed higher pullout strength without decrease in pullout stiffness compared to the standard pedicle screw. In conclusion, dual pitched thread design of the pedicle screw is considered to be more suitable than the single pitched thread for the anatomical structure of the spine.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.7 no.1
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• pp.61-68
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• 1996

Failure to change from the higher pitched voice of preadolescence to the lower pitched voice of adolescence and adulthood is called "mutational dysphonia" The voice is weak, thin, breathy, hoarse, and mono-pitched. If the voice theraphy was failed, surgery to lower vocal pitch which is refered to thyroplasty type III, is indicated. We compared the post-op acoustic parameters with pre-op data in unilateral antero-posterior shortening of the thyroid cartilage method and bilateral antero-posterior shortening of the thyroid cartilage method each other. Bilateral antero-posterior shortening of the thyroid cartilage method shows significant drop of fundamental frequency and speaking fundamental frequency statistically than unilateral shortening method. There was no significant differences in Jitter, Shimmer, SNR, MFR and other psychoacoustic analysiss parameters between two groups. These data shows that unequal tension of the vocal cord in uilateral antero-posterior shortening of the thyroid cartilage method does not control the pitch effectively so bilatreal shortening method in Type III thyroplasty is recommandable procedure in surgery of the mutational dysphonia.

• Journal of the Korean association of regional geographers
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• v.21 no.4
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• pp.660-672
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• 2015

The rural housing is a key element of the rural landscape. The studies on the rural housing have focused on folk housing, but this study focuses on the comtemporary rural housing. The research area is the eight rural settlements on the sea islands of Gyeongnam. This study may provide the base for an understanding Korean rural landscape through the analysis of the rural housing types with special reference to the roofing types and materials. Most roofing types but the flat roofing type belong to the traditional roofing types. Among the combined-style roofing(결합양식지붕) types, the pitched-and-flat roofing(경사-평지붕) type is about ten times more frequent than the pitched-and-pitched roofing(경사-경사지붕) type. The most frequent roofing materials are cement, precoated steel plate(컬러강판), and artificial slate(인조슬레이트). Five typical types of rural housing are derived from the remarkable combinations of roofing types and roofing materials in the research area.

• Magazine of the Korean Society of Agricultural Engineers
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• v.36 no.3
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• pp.84-89
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• 1994

Section forces of greenhouse structures were studied to suggest basic information for the structural design of greenhouses with respect to roof types and support conditions. Structural analyses were performed for pitched and arched roof, and fixed and hinged support under snow loads and wind loads. Followings are the results obtained and are expected to be useful in determining the span length and roof type in greenhouse design. 1. Special considerations might he required for roof design at the heavy snow region, and for the support design at the strong wind region, respectively. 2. Single-span structure was found to be stronger than multi-span structure under the snow load, but the former was found to be weaker than the latter under the wind load. 3. Arched roof structure was expected to be safer than pitched roof structure if the dimensions and loads were equal. 4. Greenhouse orientation and roof slope should be considered in optimum structural design of grrenhouses, because these two factors are closely related with the influence of wind load and snow load.

• Journal of Navigation and Port Research
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• v.31 no.10
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• pp.845-852
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• 2007

An OWC-type Wave Energy Conversion passes through 3 steps energy conversion process. This paper deal with the impulse turbine with staggered blade to improved performance by numerical analysis using commercial CFD code, FLUENT Maximum value of axial airflow velocity during exhalation is higher than that during inhalation This paper deal with special-type of Impulse Turbine so-called "Staggered Blade" for more efficiency to making air flow direct to on pressure side. Also, this paper has proposed special-type turbine with self-pitched blade more efficient.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.48 no.1
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• pp.1-6
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• 2011

We have developed the process of forming one body S-type cantilever probe in the recessed trench for fine-pitched MEMS probe card. The probe (cantilever beam and pyramid tip) was formed using Deep RIE etching and wet etching. The pyramid tip was formed by the wet etching using KOH and TMAH. The process of forming the curved probe was also developed by the wet etching. Therefore, the fabricated probe is applicable for the probe card for DRAM, Flash memory and RF devices tests and probe tip for IC test socket.

• 유체기계공업학회:학술대회논문집
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• 2003.12a
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• pp.678-683
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• 2003

Mixers are used in various industrial fields where it is necessary to intimately mix two reactants in a short period of time. However, despite their widespread use, complex unsteady flow characteristics of industrial mixers are not systematic investigated. The present study aimed to clarify unsteady flow characteristics induced by various impellers in a tank. Impellers are pitched blade turbine and neo-hydrofoil turbine types. A high speed CCD camera and an Ar-Ion laser for illumination were adopted to clarify the time-dependent flow characteristics of the mixers. The rotating speed of impellers increased from 6Hz to 60Hz by 6Hz. The maximum velocity around PBT impeller is higher than the hydrofoil type impeller. These two types of turbine shows that typical flow characteristics of axial turbine and suitable for mixing high -viscosity materials.