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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.
증례보고 : 진단받지 않은 후두개 낭종으로 인한 어려운 기관 내 삽관
이정혁 ( Jeoung Hyuk Lee ),최준권 ( Jun Gwon Choi ),윤동일 ( Dong Il Yoon ),이영민 ( Young Min Lee ),인준용 ( Jun Yong In ),정승현 ( Seung Hyun Chung ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.5
An epiglottic cyst is a common form of laryngeal cysts which are rare causes of upper airway obstruction. A congenital laryngeal cyst always causes neonatal respiratory distress, but an acquired cyst shows very wide spectrum of symptoms such as no specific complaints, dysphagia, respiratory difficulty, or even death according to its size, location, or age. From anesthesiologists` point of view, an asymptomatic undiagnosed laryngeal cyst is a major concern. Unexpectedly, it can cause difficult airway such as ‘cannot intubate` or `cannot intubate and cannot ventilate` situation during anesthesia. Recently we discovered an undiagnosed epiglottic cyst obscuring laryngeal inlet, leading to difficult intubation during general anesthesia for decompression and fusion of lumbar vertebrae. Fortunately, mask ventilation was possible, and after failed attempts of direct laryngoscopy, we could perform oral fiberoptic bronchoscope-aided intubation. He was discharged 10 days later with no harmful events. (Korean J Anesthesiol 2009;56:567~70)
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)
경옥고의 역대 주치증 분석을 통한 현대적 응용 방안의 고찰
이정혁 ( Jeong Hyeok Lee ),서영배 ( Young Bae Seo ),김병수 ( Byoung Soo Kim ) 대전대학교 한의학연구소 2016 혜화의학회지 Vol.24 No.2
Objectives : Historical study on application of Kyungohkgo, one of the most popular tonic medicine, and suggestion of modernistic method through it Methods : Investigated effect and its range of Kyungohkgo in original texts of Korean medicine, and researched studies on medical action and treatment effect of Kyungohkgo nowaday. Results : Kyungohkgo has "replenish essence and marrow(補精益髓)" as a major effect, and various original text suggested that Kyungohkgo can be used as antioxidant tonic medicine, treatment of respiratory disease like tuberculosis and medicine for bone disease controling hormone. Several research about these subjects has been progressed recently. However, the most of these researches is not an in-depth study about virtues in original texts, but deduced from effects of Kyungohkgo, and there are some studies experimented with Kyungohkgo that has not followed its own formula. Conclusions : It is required to discuss new application based on understanding effect and is range of Kyungohkgo. It could be thought that using for skin disease based on t theory of "lung presides skin and hair", chronic pulmonary disease based on treatment of cough(咳嗽), and disease of uterine and bone based on "replenish essence and marrow(補精益髓)".
심리운동 활동이 지적장애아동의 언어문제해결력에 미치는 효과
이정혁(Lee, Jung-Hyuk) 한독심리운동학회 2020 심리운동연구 Vol.6 No.1
이 연구는 심리운동 활동이 지적장애아동의 언어문제해결력에 미치는 효과를 알아보고자하였다. 이에 연구자는 인지적, 언어적 요소를 포함시키는 심리운동 활동을 선정하여 3명의지적장애 아동을 대상으로 10회기에 걸쳐 심리운동 활동을 실시한 후 언어문제해결력 검사를통해 원인·이유, 해결·추론, 단서·추측의 사전·사후 변화를 알아보았다. 연구결과 지적장애아동의 특성에 맞게 심리운동 활동을 구성하여 적용하였을 때 언어문제해결력의 하위 요소인 원인·이유, 해결·추론, 단서·추측의 각 영역에서 긍정적인 효과를 주었다. 이 연구는 심리운동 활동에서의 자발적인 참여와 동기유발이 지적장애아동의 언어문제해결력향상에 도움이 된다는 것에 의미가 있다. The purpose of this study is to investigate the effects of psychomotor activity on the verbal problem solving ability of children with intellectual disabilities. Therefore, this study selected psychomotor activity including cognitive and verbal factors and applied it to children with intellectual disabilities. The purpose of this study was to apply the psychomotor activity of children with intellectual disabilities 40 minutes and 10 sessions. Pre and post tests examined changes in the causes and reasons, solutions and inferences, cues and inferences that are sub-elements of verbal problem solving skills. Research has shown that psychomotor activity has been tailored to the characteristics of children with intellectual disabilities and contributed to improving their ability to solve verbal problems through voluntary participation and motivation. The results of this study are expected to be used as basic data for personal and professional development support for children with intellectual disabilities through psychomotor activity.