대화형 TV 현황 및 향후 발전 전망

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.

$Si_3N_4$-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.

System과 위상 System

김재룡 국민대학교 2001 기초과학연구소 논문집 Vol.20 No.-

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.

항암제 내성 L1210세포의 Glutathione 대사 관련효소 유전자의 발현 양상

김성용,김정희,김재룡 영남대학교 의과대학 1995 Yeungnam University Journal of Medicine Vol.12 No.1

생쥐의 백혈청세포 L1210과 항암제에 대하여 내성이 유도된 L1210AdR, L1210VcR과 L1210Cis에서 glutathione의 농도와 glutathione의 합성 조절에 관여하는 -glutamylcysteine synthetase(GCS)와 -glutamyl transpeptidase(GGT), 세포 이물질을 축합하는데 촉매하는 glutathione S-trasferase(GST)의 효소 활성도와 유전자의 발현 여부를 관찰하였다. 세포내 glutathione농도(μM/㎎ protein)는 L1210이 0.41±0.003, L1210AdR가 0.73±0.006, L1210VcR은 1.16±0.060, L1210Cis가 2.19±0.282으로 모세포에 비하여 내성세포에서 통계적으로 유의한 증가를 관찰하였다. Buthionine sulfoxamine(BSO)를 1??농도로 첨가하여 12시간 배양한 세포들에서의 glutathione농도는 L1210이 88%, L1210AdR가 85%, L1210VcR이 89%, 그리고 L1210Cis는 79%의 감소를 보였다. GCS의 활성도(nM/㎎ protein/min)는 L1210이 104인데 비하여 L1210AdR가 128, L1210VcR는 227, 및 L1210Cis는 212로 증가하였다. GGT의 활성도(nM/㎎ protein/min)는 L1210이 2.15±0.531이었고, L1210AdR은 2.80±0.498, L1210VcR은 2.42±0.389, 그리고 L1210Cis는 2.98±0.623으로 내성인 세포들에서 증가하였으며 L1210AdR과 L1210Cis에서 유의하였다. GST활성도(nM/㎎ protein/min)는 L1210이 16.70±4.798이었고, L1210AdR은 14.51±3.402, L1210VcR과 L1210Cis가 약간의 증가를 보였으며, L1210AdR은 오히려 감소를 보였다. DNA의 slot blot에서 GCS, GGT, GST 유전자의 모세포와 내성세포간에 별다른 차이를 보이지 않았다. Northern hybridization에서 GCS는 약 4.5kb 크기의 band, GST-π는 약 1.05kb 크기의 band를 보였으며 내성세포 모두에서 발현 증가가 관찰되었다. GGT의 경우 크기가 다른 6개의 band가 보였으며 특히 11.5kb 크기의 band에서 L1210AdR과 L1210VcR의 발현이 증가하였으며, L1210VcR에서는 L1210과 다른 내성세포에서 보이는 1.95kb 크기의 band가 보이지 않고 2.2kb 크기의 다른 band가 관찰되었다. 이상에서 L1210AdR과 L1210VcR의 내성에는 mdr1 유전자가 관여하고, L1210Cis의 내성에는 특히 glutathione이 중요하다. GCS, GGT 및 GST등의 활성도 및 유전자의 발현도 내성세포들에서 증가하였으며 이중 GCS는 내성세포내의 glutathione 합성에 가장 중요한 조절인자라 할 수 있다. Glutathione(GSH) has a very important role in detoxification of cells and is closely related to antitumor drug-resistance of cancer cells. In order to evaluate the importance of glutathione metabolism in the drug-resistant cancer cells, the concentration of cellular GSH and activities of -glutamylcysteine synthetase(GCS), -glutamyl transpeptidase(GGT) and glutathione S-transferases(GST) in the adriamycin, vincristine, or cisplatin resistant L1210(L1210AdR, L1210VcR, or L1210Cis) sublines were measured. Expression and amplification of GCS, GGT, and GST-π genes were also observed in the parent L1210 and the drug-resistant L1210 sublines. The concentration of GSH was increased 5.34 fold in L1210Cis, 2.83 fold in L1210VcR, and 1.78 fold in L1210AdR, compared to L1210. The activities of GCS and GGT were increased in drug-resistant L1210 sublines. The GST activity was increased in L1210VcR and L1210Cis but decreased in L1210AdR compared to L1210. Expression of GCS, GGT, and GST-π genes were increased in the resistant L1210 sublines compare to the parent L1210 in northern blot analyses. Overexpression of GCS, GGT, and GST-π were observed in the resistant sublines, and the increases of the concentration of glutathione and the activities of GCS and GGT in the resistant sublines may be involved in a part of the drug-resistance in the resistant sublines.

인공와우이식 환자에서의 전기자극 유발전위의 유용성

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

올림픽ㆍ스포츠ㆍ문학

김재룡 한국스포츠인류학회 2017 한국스포츠인류학회 학술대회 Vol.2017 No.08

집합 X위의 모든 위상들의 족 위에 정이된 국소 위상

김재룡 국민대학교 1999 기초과학연구소 논문집 Vol.17 No.-

실과 교과서에 수록된 도구의 인지도

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.

공주-부여일대 금강유역의 제4기 지질 및 퇴적환경 연구

김재룡,이동영 대한지질학회 1994 대한지질학회 학술대회 Vol.1994 No.