자동차 조향장치용 TAS module을 위한 Multi-track Encoder기반 신호처리보드의 구현

우승탁 ( Seong Tak Woo ),한춘수 ( Chun Soo Han ),백준병 ( Jun Byung Baek ),이상훈 ( Sang-hoon Lee ),정민우 ( Min Woo Jung ),추성중 ( Sung Joong Choo ),박재률 ( Jae Roul Park ),유종호 ( Jong-ho Yoo ),정상훈 ( Sanghun Jung ),김주영 한국센서학회 2017 센서학회지 Vol.26 No.6

As 4.0 industry has been developed, research on a self-driving car technology and related parts of an automobile has been highly investigated recently. Particularly, a TAS(Torque Angle Sensor) module on steering wheel system has been considered as a key technology because of its precise angle, torque detection and high speed signal processing. The environmental assessment is generally required on the TAS module to examine high resolution of angle/torque detection. In the case of existing TAS module, angle detection errors has been occurred by back-lash on main and sub gear in addition to complicated structure caused by gears. In this paper, a structure of the TAS module, which minimizes the numbers of components and angle detection errors on the module compared with the existing TAS module, for vehicle steering system based on a Multi-track Encoder has been proposed. Also, angle detection signal processing board, and key technology of the TAS module were fabricated and evaluated. As a result of the experiments, we confirmed an excellent performance of the fabricated signal processing board for angle detection and an applicability of the fabricated angle detection board on the TAS module of vehicles by the environmental assessment an automobile standard.

저작운동으로 인한 진동 잡음 신호의 경감을 위한 측두골 이식형 마이크로폰의 설계

우승탁 ( Seong Tak Woo ),정의성 ( Eui Sung Jung ),임형규 ( Hyung Gyu Lim ),이윤정 ( Yun Jung Lee ),성기웅 ( Ki Woong Seong ),이정현 ( Jyung Hyun Lee ),조진호 ( Jin Ho Cho ) 한국센서학회 2012 센서학회지 Vol.21 No.2

A microphone for fully implantable hearing device was generally implanted under the skin of the temporal bone. So, the implanted microphone`s characteristics can be affected by the accompanying noise due to masticatory movement. In this paper, the implantable microphone with 2-channels structure was designed for reduction of the generated noise signal by masticatory movement. And an experimental model for generation of the noise by masticatory movement was developed with considering the characteristics of human temporal bone and skin. Using the model, the speech signal by a speaker and the artificial noise by a vibrator were supplied simultaneously into the experimental model, the electrical signals were measured at the proposed microphone. The collected signals were processed using a general adaptive filter with least mean square(LMS) algorithm. To confirm performance of the proposed methods, the correlation coefficient and the signal to noise ratio(SNR) before and after the signal processing were calculated. Finally, the results were compared each other.

완전 이식형 보청기 기술 평가 기반의 새로운 이식형 음향센서 제안

조진호 ( Jin Ho Cho ),우승탁 ( Seong Tak Woo ),임형규 ( Hyung Gyu Lim ),정의성 ( Eui Sung Jung ),이정현 ( Jyung Hyun Lee ),이승하 ( Seung Ha Lee ),성기웅 ( Ki Woong Seong ) 한국센서학회 2014 센서학회지 Vol.23 No.3

Key components of implantable hearing aids are consist of an acoustic sensor that collect external sound by suppressing the body noise, a signal processor module for compensation algorithm of hearing loss, and a output transducer which has tiny size but have high efficiency, respectively. In the partial implantable hearing aids, technologies of transducer and signal processor are so matured that can be applied not too much difficulty. However, due to the difficulties in implantable acoustic sensor technology, such as minimization of masticatory sound and damage of sensor’s membrane from external impact, practical use of fully implantable hearing aids have not successful so far. In this paper, we have proposed a novel implantable acoustic sensor which has trans-tympanic structure, and is verified that the proposed method can be very useful for fully implantable hearing aids by cadaveric experiments.

EPG 왜곡 과제에 대한 예비 및 현직 언어재활사들의 청지각 능력 : 치경마찰음 /ㅅ/의 치간음화, 경구개음화, 설측음화를 중심으로

김지영(Ji-Yeong Kim),우승탁(Seong-Tak Woo),하지완(Ji-Wan Ha) 한국언어청각임상학회 2021 Communication Sciences and Disorders Vol.26 No.4

배경 및 목적: 임상 현장에서 말문제는 대부분 청지각적 평가로 이루어지므로 말소리에 대한 치료사의 ‘민감한 귀’는 언어재활사들이 갖추어야 할 필수적인 조건 중 하나일 수밖에 없다. 본 연구에서는 언어재활사를 준비하고 있거나 현재 활동중인 언어재활사들을 대상으로 왜곡된 말소리에 대한 청지각적 판단 능력을 알아보고자 하였다. 방법: 언어치료 전공 실습생, 경력 5년 미만 또는 이상의 언어재활사 각각 20명씩 총 60명의 평가자들은 청지각 평가의 인식에 관한 설문 및 청지각 판단 실험 과제에 참여하였다. 청지각과제는 /ㅅ/의 정조음과 왜곡된 조음(치간음화, 경구개음화, 설측음화)을 들려주고 해당 말소리를 보기에서 선택하는 방식이었다. 과제에 사용된 말소리 샘플은 전자구개도(EPG)를 사용하여 제작하였으며, 30개 문항을 문맥(ㅏ/ㅜ)과 언어단위(1음절/2음절/문장)를 달리하여 제시하였다. 결과: 평가자들은 설문 결과와 동일하게 청지각과제에서도 치간음화를 가장 잘 지각하였으며, 설측음화 지각에 가장 어려움을 보였다. 또한, 문맥과 언어단위에 따른 오류율 비교 결과, 모든 왜곡 형태를 /ㅜ/문맥에서 더 잘 지각하였으며, 왜곡 형태별 반응양상에서는 치간음화와 경구개음화를 정반응으로 지각하는 경우가 가장 많았던 반면 설측음화는 ‘정조음’으로 판단한 경우가 가장 많았다. 논의 및 결론: 본 연구를 통해 언어재활사들을 위한 보다 적극적인 청지각 훈련이 필요하다는 것을 확인하고, 청지각 훈련의 수단으로서 전자구개도의 활용가능성을 기대한다. Objectives: In a clinical setting, a ‘trained ear’ is the essentials for speech-language pathol-ogists (SLPs) because most SLPs rely on the auditory - perceptual method during assess-ment and treatment for speech difficulties. However, transcribing distortion errors using only auditory-perceptual judgement is a difficult task. This study investigated the auditory-perceptual ability in terms of distortion errors for pre and present SLPs. Methods: Sixty pre and present SLPs completed a survey, then performed a perceptual judgement task which was manufactured by electropalatography (EPG). The task consisted of 30 questions, in-cluding distorted (dentalized, palatalized, lateralized) and normal speech samples of Ko-rean fricative /s/ with different types of vowels (/ɑ/, /u/) and lengths (1-syllabled, 2- sylla-bled, sentence). Results: There was no significant difference in the distortion task among three groups. All participants had the highest score in “dentalization”, the lowest in “lateral-ization”, and all distortion types were perceived better in the /u/ context than /ɑ/. Also, SLPs tended to judge “lateralization” errors as “normal articulation” and many of the participants perceived “palatalization” as “lateralization”. Conclusion: The results of this study indicated that active auditory training for SLPs is necessary to improve auditory perceptual ability, and suggests that EPG could be a useful instrument for the auditory training program.

전자구개도(EPG)를 이용한 한국어 치경마찰음 /ㅅ, ㅆ/의 조음운동적 특성

김지영(Ji-Yeong Kim),우승탁(Seong-Tak Woo),김미진(Mi-Jin Kim),오다희(Da-Hee Oh),김수진(Su-Jin Kim),하지완(Ji-Wan Ha) 한국언어청각임상학회 2021 Communication Sciences and Disorders Vol.26 No.2

배경 및 목적: 본 연구는 전자구개도를 사용하여 한국어의 치경마찰음인 /ㅅ/와 /ㅆ/를 조음운동적 측면에서 비교 분석해보고, 치경마찰음 조음 시 나타나는 혀-구개 접촉에 관한 정보를 제공하기 위한 목적으로 시행되었다. 방법: 한국어가 모국어이며 발음에 문제가 없는 정상 성인 5명이 전자구개도를 착용하여 치경마찰음을 분절음 차원에서뿐 아니라 단어 내 위치 및 모음문맥을 달리하여 녹음한 후 팰라토그램을 분석하였다. 결과: 그 결과, /ㅅ/와 /ㅆ/는 협착의 너비와 혀-구개 최대접촉구간에서 유의한 차이를 보였다. /ㅆ/에서 협착의 너비가 더 좁고 전체 혀-구개 접촉구간은 더 넓게 나타났다. 단어 내 위치에 따른 차이는 유의하지 않았지만, 고모음인 /ㅣ/ 문맥에서는 저모음인 /ㅏ/에 비해 협착의 위치가 후방화되었으며, 지속시간도 가장 긴 것으로 나타났다. 또한 혀-구개 접촉 구간도 가장 넓게 나타났다. 논의 및 결론: 본 연구는 전자구개도를 사용하여 한국어 치경마찰음의 혀와 구개 접촉에 관한 정보를 제공했다는 점에서 그 의의를 갖는다. 또한 본 연구의 결과는 한국형 전자구개도의 개발의 기초자료로써 그 의미가 있다. Objectives: The present study is aimed an electropalatographic investigation of Korean fricatives /s/ and /s*/. All data from this study is based on the production of 5- adult speakers who speak Korean as their first language. Methods: Electropalatography (EPG) is an instrumental technique for showing tongue and palate contact during speech. The participants recorded /s/ and /s*/ in CV (/si/, /sɑ/, /su/, /s*i/, /s*ɑ/, /s*u/) and VCV (/ɑsi/, /ɑsɑ/, /ɑsu/, /ɑs*i/, /ɑs*ɑ/, /ɑs*u/) context using EPG and then, four variables were analyzed: row of medial groove (RMG), medial groove width (MGW), medial groove length (MGL), and maximum contact frame (MCF). Results: There was significantly greater medial groove width and maximum contact frame for / s*/ compared to /s/. The difference between /si/ and /sɑ/ was also found in the row of medial groove, medial groove width and maximum contact frame. /si/ was produced further back, and had a longer medial groove length. Also, it showed more total tongue-palate contact than /sa/. Conclusion: A various range of palatal contact patterns were found between typical adults for perceptually normal /s/ and /s*/. The results provided the information about tongue–palate pattern of Korean fricatives /s/ and /s*/. These findings would be utilized to build the basic data and useful information for Korean EPG system.

말소리 왜곡에 대한 언어재활사들의 청지각적 판단 능력

김지영(Ji Yeong Kim),우승탁(Seong Tak Woo),하지완(Ji Wan Ha) 한국언어치료학회 2021 한국언어치료학회 학술발표대회 논문집 Vol.2021 No.11