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뇌수술 시 과호흡과 만니톨의 투여가 뇌혈류와 뇌산소대사에 미치는 영향
김지헌,김경식,문봉기,조경기,신용삼,이영주,김진수 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.43 No.4
Background: There are therapies to lower intracranial pressure (ICP) including head elevation, hyperventilation, diuretics injection, intravenous mannitol, hypothermia, cerebrospinal fluid drainage, and cerebral resection in neurosurgical patients. However in recent reports, hyperventilation followed by mannitol administration may lead to cerebral ischemia. Therefore, we investigated the effect of 0.5-1.0 g/kg mannitol administration on jugular venous oxygen saturation (SjVO_2) and cerebral arterial-jugular venous oxygen content difference (AVDO_2) at PaCO_2 25-30 mmHg and 35-40 mmHg in patients undergoing neurosurgery. Methods: we studied 17 patients undergoing neurosurgery in the Ajou University Hospital. Anesthesia was induced with fentanyl, midazolam, thiopental, and vecuronium, and maintained with )_2-Air-Isoflorane, a continuous infusion of fentanyl, and vecuronium. Patients were divided into two groups. Group 1 (n = 10) which is PaCO_2 25-30 mmHg and Group 2 (n = 7) which is PaCO_2 35-40 mmHg by controlling ventilator. Measurements of SjVO_2 and AVDO_2 in following time intervals: Ⅰ = preinjection of mannitol, Ⅱ = postinjection 20 minutes of mannitol, Ⅲ = postinjection 40 minutes of mannitol were obtainde for each group. 0.5-1.0 g/kg mannitol was administered intravenously just at duramater opening. Results: Hemodynamics and hematologics were not significantly different among the two groups. SjVO_2 of each group are as follows; Group 1; Ⅰ (70.3 ± 8.1%), Ⅱ (66.3 ± 6.9%), Ⅲ (69.1 ± 7.9%) and Group 2; Ⅰ (78.6 ± 7.4%), Ⅱ (75.1 ± 8.1%), Ⅲ (76.0 ± 11.2%), Hyperventilation significantly decreased SjVO_2- AVDO_2 was not significantly different but SjVO_2 in Ⅱ was significantly decreased compared with Ⅰ and Ⅲ in Group 1 (20% patients). Conclusions: Mannitol produced a change of SjVO_2 during hyterventilation. Therefore, intravenous mannitol during hyperventilation should be given cautiously according to the patients status because it may cause cerebral ischemia in critical patients. (Korean J Anesthediol 2002; 43: 462~467)
조주희(Ju-hee Cho),진주경(Ju-kyong Jin),정재협(Jae-hyup Jeong),임예은(Ye-Eun Lim),정동석(Dong-seok Jeong) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
In this paper, we propose the robust video signature using log-polar mapping method. To guarantee the similarity between original video contents and modified video contents, we develop the contents region extraction method which uses log-polar transformed video frame images. Contents region is the region where important information is contained. Experimental results showed that the proposed video signature has good robustness and uniqueness, which are the two essential properties of video signatures.
매크로 블록 정보와 시공간 히스토그램을 이용한 빠른 장면전환 검출
진주경(Ju-Kyong Jin),조주희(Ju-Hee Cho),정재협(Jae-Hyup Jeong),정동석(Dong-Suk Jeong) 大韓電子工學會 2011 電子工學會論文誌-SP (Signal processing) Vol.48 No.1
기존의 많은 장면 전환 검출 알고리즘은 점진적 장면 전환을 검출하기보다는 급격한 장면 전환 검출에 중점이 맞추어졌다. 일반적으로 점진적 장면 전환 검출에 중점을 둔 알고리즘은 많은 연산량을 필요로 한다. 또한 장면 전환 검출에 오류 요소인 플래쉬 라이트, 카메라 움직임 및 특수효과 등의 다양한 오류 요소를 고려하지 못하는 경우가 많다. 또한 기존의 많은 방법들은 히스토그램 기반의 알고리즘을 제시하였지만 좋은 성능에 비해 처리속도에서 취약하다. 본 논문에서는 저장된 동영상으로부터 수직과 수평 블록의 시간적 슬라이스 영상과 슬라이스 영상 내 매크로 블록에 해당되는 정보를 이용한 빠르고 정확한 장면 전환 검출 알고리즘을 제안한다. 슬라이스 영상으로부터 시, 공간 상관관계의 히스토그램을 구성하고, 이를 그래프 컷 분할 알고리즘에 적용하였다. 처리속도 향상을 위해 영상 전체가 아닌 각각 영상 내 수직, 수평 방향의 중심 부분의 해당되는 위치의 블록에서만 시공간 정보를 추출하여 히스토그램을 구성하였다. 또한 카메라, 물체의 움직임 및 특수효과 변화 등을 효과적으로 검출할 수 있도록 매크로 블록의 움직임과 형태 정보를 이용하여 상당한 변별력 향상을 보였다. Most of the previous works on scene change detection algorithm focus on the detection of abrupt rather than gradual changes. In general, gradual scene change detection algorithms require heavy computation. Some of those approaches don't consider the error factors such as flashlights, camera or object movements, and special effects. Many scenes change detection algorithms based on the histogram show better performances than other approaches, but they have computation load problem. In this paper, we proposed a scene change detection algorithm with fast and accurate performance using the vertical and horizontal blocked slice images and their macro block informations. We apply graph cut partitioning algorithm for clustering and partitioning of video sequence using generated spatio-temporal histogram. When making spatio-temporal histogram, we only use the central block on vertical and horizontal direction for performance improvement. To detect camera and object movement as well as various special effects accurately, we utilize the motion vector and type information of the macro block.
Kyong Min Kim,Byung Jo Jang,Whang Sin Cho,Sung Hoo Ju 한국물리학회 2005 Current Applied Physics Vol.5 No.1
We have developed a thin lm multi layer as encapsulation method for OLED. The characteristics of the OLED encapsulatedwith thin lm multi layer showed the similar OLED with metal cap encapsulation. The IVL test of OLED panels with thin lmmulti layer showed that the brightness is 1000 cd/m2 with the eciency of 7.6 lm/W at the 7 V and it took more than 2000 h for thebrightness to fall from 1000 to 500 cd/m2. This result shows that the device with thin lm multi layer has similar level of brightnessand eciency and more than 95% of lifetime compared to device with metal can encapsulation. Thus, we can conrm that thin lmmulti layer has an eect as encapsulation process to protect organic light emitting device. Also, thin lm multi layer for the pro-tection of organic light emitting device simplies passivation process, makes less than 0.8 mm thick device and is also applicable towide and exible display.
Clinical Application of Continuous Intraoperative Neuromonitoring during Thyroid Surgery
Cho Rok Lee,Jin Kyong Kim,Sang-Wook Kang,Jong Ju Jeong,Kee-Hyun Nam,Woong Youn Chung 대한신경모니터링학회 2022 Journal of Neuromonitoring & Neurophysiology Vol.2 No.1
Routine visual identification of the recurrent laryngeal nerve (RLN) is the gold standard of care during thyroidectomy because it is associated with low rates of RLN palsy. Over the last two decades, intraoperative neuromonitoring (IONM), which allows for assessment of the RLN’s functional integrity during the operation, has been widely used for risk minimization in thyroid surgery as a valuable adjunct to visual nerve identification. Currently, one of the most important trends in IONM is the real-time monitoring of the vagus nerve (VN) to prevent iatrogenic injury of RLN. Continuous IONM (C-IONM) seems to be superior to intermittent IONM (I-IONM) because it enhances standardization by permanent VN stimulation and provides entire and constant RLN function monitoring during thyroidectomy procedures. In this article, we provide a comprehensive review of the C-IONM technique.
Cho Rok Lee,Jin Kyong Kim,Sang-Wook Kang,Jandee Lee,Jong Ju Jeong,Kee-Hyun Nam,Woong Youn Chung 대한갑상선-내분비외과학회 2020 The Koreran journal of Endocrine Surgery Vol.20 No.3
Purpose: Papillary thyroid carcinoma (PTC) has a high rate of lateral neck node metastases, and completeness of surgical resection is an important determinant of outcomes. The appropriate extent of therapeutic lateral neck dissection remains controversial. This study aims to access the impact of lateral neck node dissection of levels II to V in a large patient series. Methods: A retrospective review of the clinical charts and hospital records of 778 consecutive patients who had metastatic PTC and who underwent unilateral cervical lymph node dissection at a single institution between 1999 January and 2009 December. Results: A total of 489 modified radical neck dissection (MRND) (levels II-V) and 289 internal jugular node dissection (IJND) (levels II-IV) were performed in 778 patients. There were no differences in clinicopathological findings except for the retrieved and metastatic lateral lymph nodes (LLNs). The multiple-level lymph node (LN) metastasis was more prevalent in the MRND group, and the distribution of metastasis lymph node levels was significantly different in both group. The recurrence rate and disease-free survival were similar in the 2 groups. In multivariate analysis, female sex, tumor size, and multi-level LLN metastasis were independent predictors recurrence. Postoperative complications were similar in MRND and IJND group. Conclusion: IJND achieves favorable postoperative results in PTC with lateral neck node metastasis patients, and level V metastasis/recurrence incidence is low. Therefore, the extent of lateral neck node dissection, whether IJND or MRND, can be considered for patients according to the simultaneous metastasis level and the tumor size.
A Study on Reducing Cogging Torque of Interior PM Motor for Electric Compressor
Ju-Hee Cho,Sang-Taek Lee,Duck-Shik Shin,Man-Seung Han,Dae-kyong Kim 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4
This paper proposes a new design of rotor shape of IPM motor used for electric air-conditioning system of HEV. The distribution of the residual magnetic flux density at the air gap is modified by rotor surface shape and V-type magnet angle. The finite-element method (FEM) is applied for the optimal shape design of rotor surface shape and V-type magnet angle, because the IPM motor has an extreme saturation in rotor core. The validity of the proposed rotor shape optimization is confirmed by the manufactured IPM rotor core and measured the performance of the cogging torque.
Study on Reducing Cogging Torque of Interior PM Motor for Agricultural Electric Vehicle
Cho, Ju-Hee,Park, Yong-Un,Kim, Dae-Kyong Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
This paper proposes a new design of rotor shape of Interior Permanent Magnet Synchronous Motor (IPMSM) used for agricultural electric vehicle (AEV). The distribution of the residual magnetic flux density at the air gap is modified by rotor surface shape and V-type magnet angle. As a result, cogging torque and physical characteristic have been improved, and back electromotive force (back-EMF) of the suggested model has been improved to be closest to sine wave form compared to initial model. The validity of the proposed rotor shape optimization is confirmed by the manufactured IPM rotor core and measured the performance of the cogging torque.