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김재룡,좌덕진 한국통신학회 2001 정보와 통신 Vol.18 No.10
디지털 방송이 본격화되면 기존의 아날로그 방송과는 달리 영상과 음성정보에 추가하여 데이터를 전송할 수 있으며, 여기에 주변 기기를 이용한 대화형 TV를 구현할 수 있다. 일반적인 대화형 TV의 지상파 및 케이블 방송의 매체별 현황, 세계적인 규격 활동 및 그 특징을 파악하고 향후 발전 방향에 대해서도 논의하고자 한다. 아울러 앞으로 대화형 TV에 적용 가능한 여러 가지 어플리케이션에 대해서도 논의를 하였으며, 각 업체들의 현황 및 특징도 나열하였다. 이러한 대화형 TV의 발전은 앞으로의 방송 문화에도 상당히 많은 변화를 불러일으키며, 기타 방송에 관련된 산업 전반의 발전에 기여할 것이다.
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김재룡,좌덕진 에스케이텔레콤 (주) 2001 Telecommunications Review Vol.11 No.5
디지털방송 기술의 발달로 상당히 많은 대역폭을 데이터 전송에 할당할 수 있다. 이러한 디지털 방송이 본격화 되면 기존의 아날로그 방송과는 달리 영상과 음성정보에 추가하여 데이터를 전송할 수 있으며, 여기에 주변 기기 및 리턴 채널을 이용한 대화형 TV를 구현할 수 있다. 일반적인 대화형 TV의 지상파 및 케이블 방송의 매체별 현황, 세계적인 규격 활동 및 그 특징을 파악하고 향후 발전 방향에 대해서도 논의 하고자 한다. 아울러 앞으로 대화형 TV에 적용 가능한 여러 가지 어플리케이션에 대해서도 논의를 하였으며, 각 업체들의 현황 및 특징도 나열하였다. 아울러 데이터 방송을 구현하는데 있어 업계의 개발상에 있어서의 여러 가지 특이 사항에 대해서도 분석하고자 한다. 이러한 대화형 TV의 발전은 앞으로의 방송 문화에도 상당히 많은 변화를 불러 일으키며, 기타 방송에 관련된 산업 전반의 발전에 기여할 것이다.
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$Si_3N_4$-Zr(Y)$O_2$ 복합체의 열처리에 따른 상분석 및 파괴인성
김재룡,김종희 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.1
The reaction product between Si3N4 and ZrO2 has been studied by heat treatment of Si3N4-Zr(Y)O2 composite in high vacuum(<10-5 torr) and in air at $700^{\circ}C$. ZrN was formed after heat treatment in vacuum and easily oxidized after heat treatment in air. The amount of ZrN is related to the Y2O3 content dissolved in ZrO2. After the heat treatment in air the toughness increased and the spalling due to the oxidation of ZrN in specimen surface was observed. As a result, it is suggested that the formation of ZrN phase in Si3N4-ZrO2 composite enhance the toughness of the composite in an oxidation conditon.
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소아 인공와우이식 환자에서의 전기 자극 복합 활동 전위의 역치와 말소리 지각력과의 관계
김재룡,신봉식,정성욱,우지환,김리석 대한이비인후과학회 2011 대한이비인후과학회지 두경부외과학 Vol.54 No.10
Background and Objectives Neuropathology around the cochlea could create variation from site to site in physiological thresholds of cochlear implant users. This variability would be detrimental to speech recognition with a cochlear implant for a variety of reasons, including distortion of the place code and variation in the number of neurons. The purpose of this study is to examine the relationship between thresholds of electrically evoked compound action potential (ECAP) and speech perception in children implanted with the Nucleus Freedom devices. Subjects and Method Fifty-seven children implanted with the Nucleus Freedom device participated in this study. ECAP thresholds were recorded using the automated neural response telemetry test protocol. We then calculated mean threshold and three metrics to assess across-site variation within subjects: 1) the variance of T levels for all tested sites, 2) the range of T levels (highest minus lowest) across all tested sites and 3) site-to-site variation. For each subject, these measures were compared with performance on tests of word recognition. Results There was considerable across-site (within-subject) and across-subject variability in thresholds. However, we found no significant correlation between speech recognition and across-site variation of thresholds as well as mean threshold levels. Conclusion These data suggest that the ECAP measures of thresholds may not be an accurate predictor of speech perception ability.
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김재룡 대한이비인후과학회 2012 대한이비인후과학회지 두경부외과학 Vol.55 No.5
Cochlear implants (CIs) are generally used in individuals with severe to profound hearing loss. Needs for objective measures with CI users have increased due to implantation of children at younger ages and large variation in performance. To date, a significant body of research has been published that describes the general methodology used to measure electrically evoked neural responses as well as issues and stimulation paradigms relevant to the measurement of specific neural responses and several potential applications for objective measures with CI users. Objective measures of cochlear implant function have most certainly played a role in developing a better understanding of the process of electrical stimulation of the auditory nerve and the activation of the central auditory pathways. An important remaining issue in further improvements with cochlear implants is the better understanding of variability across subjects and the development of methods to improve signal processing in poor performers. The measurement of electrically evoked neural activity, both peripheral and central response, can be an important tool for accomplishing such tasks. Korean J Otorhinolaryngol-Head Neck Surg 2012;55:265-71
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김재룡,최준섭,정성봉,이상수 한국실과교육학회 2005 한국실과교육학회지 Vol.18 No.4
The purpose of this study was to examine elementary school students' recognition of tools in practical arts textbooks in terms of students' gender and residential areas in order to provide basic data for elementary practical arts education. The main results of this study were as follows :First, elementary school students' overall degree of recognition of tools in practical arts textbooks was high such as fields: computer, home economics, agriculture, electricity and electronics, and construction. Second, there was no meaningful difference between male and female students although some differences were found in the case of specific fields. Third, male students' degree of recognition was high in the order of computer, agriculture, home economics, electricity and electronics, and construction. Female students' degree of recognition was high in the order of computer, home economics, agriculture, electricity and electronics, and construction. Fifth, urban area students' degree of recognition was high in the fields of computer, agriculture, home economics, and electricity and electronics. Rural area students' degree of recognition was also high especially in the fields of computer, agriculture, and home economics.
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