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입체음향시스템을 위한 상호간접제거 기법의 유효청취범위 분석
이정혁,정상효,유승수,송익호,김선용,Lee, Jung-Hyuck,Jeong, Sang-Hyo,Yoo, Seung-Soo,Song, Iick-Ho,Kim, Sun-Yong 한국통신학회 2011 韓國通信學會論文誌 Vol.36 No.5C
본 논문에서는 입체음향시스템을 위한 대표적인 상호간섭제거 기법인 머리전달함수만 (head related transfer function, HRTF) 이용한 기법과 두 귀에 도달하는 소리의 시간차와 세기차를 (interaural time/intensity difference, ITD와 IID) HRTF와 함께 이용한 기법의 상태지수와 ITD/IID 수준을 보이고, 이로부터 두 기법의 유효청취범위를 보인다. 입체음향시스템의 유효청취범위는 청취자가 의도된 음향의 입체감을 왜곡 없이 느낄 수 있는 공간으로 등역 (equalization zone) 또는 sweet spot으로도 부른다. In this paper, equalization zone of two crosstalk cancellation (CC) schemes, which are the one based on only head related transfer function (HRTF) and the other one based on interaural intensity/time difference (ITD/IID) as well as HRTF is studied. To do this, the condition numbers and ITD/IID levels of two schemes are shown.
Desflurane 폐포내농도 상승에 따른 뇌산소포화도 반응에 미치는 Remifentanil의 효과와 뇌혈관의 이산화탄소 반응성
이정혁 ( Jeoung Hyuk Lee ),이윤석 ( Youn Suk Lee ),인준용 ( Jun Yong In ),정승현 ( Seung Hyun Chung ),신홍일 ( Hong Il Shin ),이경진 ( Kyoung Jin Lee ),김경옥 ( Kyoung Ok Kim ),조헌 ( Hun Cho ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.5
Background: It is known that sympathetic stimulation and increase in cerebral blood flow velocity can be induced by desflurane. Cerebral oxygen balance could be disturbed during desflurane induction. Aim of this study was to elucidate that cerebral oxygen imbalance induced by desflurane mask induction can be reduced by combination of remifentanil and hypocapnia. Methods: Twenty ASA 1-2 subjects were allocated randomly into 5 groups divided by concentration of remifentanil (0.0, 0.5, 1.0, 1.5, and 2.0 ng/ml). After confirmation of attaining proposed concentration of remifentanil, propofol and vecuronium were administered and mechanical ventilation was done with 8% desflurane with facial mask. Subsequently, changes in regional cerebral oxygen saturation (△rSO2), arterial blood pressure, heart rate, cardiac index, estimated alveolar concentration of desflurane (P(DESF)), and end-tidal concentration of carbon dioxide (PET(CO2)) were recorded for the following 10 minutes. According to concentration of desflurane and remifentanil, △rSO2 and hemodynamic factors were checked. Results: During desflurane induction, changes in cerebral oximetry reached up to+10% (6 [first quartile], 13 [third quartile]). Arterial blood pressure, heart rate, and cardiac index were changed within clinical ranges. The △rSO2 showed S-shaped increasing pattern according to increasing P(DESF). Hypocapnia and concentration of remifentanil reduced the maximum △rSO2 (P=0.0046, P=0.0060). Hypocapnia also shifted the curve to left (P=0.0001). Conclusions: During 8% desflurane induction, regional cerebral oxygen saturation (rSO2) increases maximum +25%. Hypocapnia and use of remifentanil can reduce the increase in regional cerebral oxygen saturation. (Korean J Anesthesiol 2009;56:543~51)
차량, 보행자 구분 피난경로 산정 방법론 개발 - 영덕군 병곡면을 중심으로 -
이정혁(Lee, Jung-Hyeok),이지수(Lee, Ji-Soo),소수현(So, Soo-Hyun),이경원(Lee, Gyeong-Won) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.2
The spatial scope of this study is limited to Byeonggok-myeon, Yeongdeok-gun, and the area is a disaster risk area designated by the Ministry of Public Administration and Security because of its high aging population density. The purpose of this study is to present evacuation routes that distinguish vehicles from pedestrians in the event of a disaster. As a research method for this purpose, the optimal pedestrian-only evacuation route and vehicle priority evacuation route are presented by field demonstration and GIS network analysis utilizing existing space data. According to the results of this study, the evacuation area when evacuating using a vehicle is about eight times larger than the evacuation area when evacuating only by walking.
이정혁(Jung-Hyuck Lee),김상현(Sang-Hyun Kim),오창세(Chang-Se Oh),서민석(Min-Seok Seo),김영돈(Young-Don Kim),박현주(Hyun-Ju Park) 한국통신학회 2014 韓國通信學會論文誌 Vol.39 No.10(융합기술)
본 논문에서 소개하는 스마트 멀티탭은 스마트 폰으로 서버 PC를 통해 제어되는 전자기기이다. 네트워크 망에서 동작하는 스마트 멀티탭은 기존 멀티탭에 무선통신 프로토콜인 Zigbee 통신 모듈을 내장시켜서 사용자가 홈서버를 통해 원격에서 가전기기의 전원을 제어할 수 있게 한다. 게이트웨이의 역할을 하는 홈 서버는 인터넷을 통해 스마트 기기와 연결되어 있다. 본 논문의 최종 결과물을 통해 사용자는 스마트 기기로 멀티탭의 ON/OFF 상태정보를 확인하고 즉시 제어를 하거나 사용자가 원하는 시간에 맞춰 제어를 할 수 있다. OFF시에는 SSR모듈로 전기가 지나가는 통로를 막기 때문에 스마트 멀티탭을 구동하는데 드는 미량의 전력 소모(2watt) 이외에 모든 대기전력이 차단된다. 이를 통해 전기에너지 절감 효과를 기대할 수 있다. Smart Multiple-Tap to be introduced in this paper, is an electronic device that controls the Multibple-Tap through the Smartphone. It runs on network and has an inbuilt Zigbee communication module. Thus, users can control home devices from remote through home server. Mentioned home server is operated as a gateway and is connected with smart devices on the Internet. To sum up, Users using this Smart Multiple-Tap can check the state information of the multi-tap ON/OFF and can control immediately by smartphone. also, Smart Multiple-Tap perfectly shut down the standby power. when users turn off each of the Smart Multiple-Tap’s circle, It drives automatically lowest electricity-consuming mode and shut down the standby power by its own built-in SSR module. therefore, it will bring the energy saving effect on environment using Smart Multiple-Tap.
임상연구 : 광봉을 이용한 기관내 삽관 시 혈역학적인 변화를 최소화하기 위한 Remifentanil의 정적 효과처 농도는?
이정혁 ( Jeoung Hyuk Lee ),전우재 ( Woo Jae Jeon ),심재항 ( Jae Hang Shim ),조상윤 ( Sang Yoon Cho ),염종훈 ( Jong Hoon Yeom ),신우종 ( Woo Jong Shin ),김경헌 ( Kyoung Hun Kim ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.52 No.3
Background: In the previous studies, remifentanil reduces the hemodynamic change induced by endotracheal intubation. We studied the optimal effect site concentration of remifentanil for endotracheal intubation using light wand. Methods: Sixty ASA 1 or 2 patients scheduled for elective surgery under general anesthesia were classified in three groups according to the TCI (target controlled infusion) dose of remifentanil. Each group was administered 4μg/ml of propofol TCI, rocuronium, with 2 ng/ml (group 1), 4 ng/ml (group 2), 6 ng/ml (group 3) of remifentanil TCI. Blood pressure, heart rate and bispectral index score were measured before induction, 3 minutes after remifentanil and propofol TCI, after endotracheal intubation using light wand, and 3 minutes after endotracheal intubation. Statistical analysis was done for comparison of time and dose dependant change among the groups. Results: After endotrachal intubation, blood pressure and heart rate were significantly increased in group 1, and decreased in group 2 and 3. 3 minute after endotracheal intubation, heart rate significantly decreased in group 3, but there were no changes in group 2. Conclusions: The spontaneous BRS was decreased during ketamine induction of general anesthesia. These results suggest that anesthesia induction with ketamine impairs baroreflex control of heart rate, which may provoke hemodynamic instability. (Korean J Anesthesiol 2007; 52: 278~83)