• Journal of Korean Neurosurgical Society
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• 제63권2호
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• pp.248-260
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• 2020

Objective : To investigate the efficiency of diffusion tensor imaging (DTI) fiber-tracking based neuronavigation and assess its usefulness in the preoperative surgical planning, prognostic prediction, intraoperative course and outcome improvement. Methods : Seventeen patients with cerebral masses adjacent to corticospinal tract (CST) were given standard magnetic resonance imaging and DTI examination. By incorporation of DTI data, the relation between tumor and adjacent white matter tracts was reconstructed and assessed in the neuronavigation system. Distance from tumor border to CST was measured. Results : The sub-portion of CST in closest proximity to tumor was found displaced in all patients. The chief disruptive changes were classified as follows : complete interruption, partial interruption, or simple displacement. Partial interruption was evident in seven patients (41.2%) whose lesions were close to cortex. In the other 10 patients (58.8%), delineated CSTs were intact but distorted. No complete CST interruption was identified. Overall, the mean distance from resection border to CST was 6.12 mm (range, 0-21), as opposed to 8.18 mm (range, 2-21) with simple displacement and 2.33 mm (range, 0-5) with partial interruption. The clinical outcomes were analyzed in groups stratified by intervening distances (close, <5 mm; moderated, 5-10 mm; far, >10 mm). For the primary brain tumor patients, the proportion of completely resected tumors increased progressively from close to far grouping (42.9%, 50%, and 100%, respectively). Five patients out of seven (71.4%) experienced new neurologic deficits postoperatively in the close group. At meantime, motor deterioration was found in six cases in the close group. All patients in the far and moderate groups received excellent (modified Rankin Scale [mRS] score, 0-1) or good (mRS score, 2-3) rankings, but only 57.1% of patients in the close group earned good outcome scores. Conclusion : DTI fiber tracking based neuronavigation has merit in assessing the relation between lesions and adjacent white matter tracts, allowing prediction of patient outcomes based on lesion-CST distance. It has also proven beneficial in formulating surgical strategies.

• 한국응용과학기술학회지
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• 제30권4호
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• pp.649-655
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• 2013

페롭스카이트 촉매와 Mo, Bi를 기본으로 하는 복합 산화물 촉매를 이용하여 천연가스의 주성분인 메탄의 부분산화를 통하여 메탄올을 직접 합성하였다. 페롭스카이트($ABO_3$) 촉매는 A 및 B site 성분을 변화시키면서 사과산법으로 제조하였으며, Mo, Bi를 기본으로 하는 3성분계 복합 산화물 촉매는 공침법으로 제조하여 반응특성을 살펴보았다. 페롭스카이트 촉매에서 A site에 알칼리 금속인 Sr을, B site에 전이금속인 Cr을 도입한 $SrCrO_3$ 촉매가 $400^{\circ}C$에서 메탄올 선택도 11%로 가장 우수한 결과를 보였다. Mo, Bi를 기본으로 하는 3성분계 복합 산화물 촉매의 경우 모든 촉매에서 메탄 전환율에는 큰 차이를 보이지 않았으며, Cr을 첨가한 Mo-Bi-Cr 복합 산화물 촉매가 $400^{\circ}C$에서 메탄올 선택도 15.3%로 가장 우수한 결과를 나타냈다. 3성분계 복합 산화물 촉매에서 촉매의 활성과 메탄올 선택도는 촉매의 표면적에 정비례하였다.

• 방송공학회논문지
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• 제17권6호
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• pp.945-953
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• 2012

깊이지도를 구하는 방법 중 많이 사용되어지는 방법으로 줄무늬 패턴을 이용하는 방법이 존재한다. 이 방법은 프로젝터-카메라 시스템(Pro-Cam System)을 이용하며 프로젝터로 조사한 패턴을 카메라로 촬영하여 원래의 패턴과 촬영된 패턴간의 기하학적인 관계를 구하여 깊이지도를 구하는 방법이다. 본 논문에서는 이와 같이 구조광을 이용하는 깊이지도 획득 시스템에서 효과적으로 멀티 쓰레드를 사용하여 실시간 처리하는 것을 제안한다. 일반적으로 자주 사용되는 멀티 쓰레딩에는 CPU의 쓰레드를 이용하는 OpenMP와 GPU의 쓰레드를 이용하는 CUDA가 있다. 이 두 가지 기법은 수행하는데 차이점이 존재하기 때문에 상황에 따라 OpenMP가 더 좋은 효율을 보이는 부분이 있고 CUDA가 더 좋은 효율을 보이는 부분이 있다. 따라서 본 논문에서는 이 두 가지에 대해서 각 부분의 특성에 맞게 더 좋은 효율을 보이는 멀티 쓰레드를 적용하였다. 결과적으로 제안된 방법은 $1280{\times}800$의 영상에 대해 25fps 이상의 깊이지도를 획득할 수 있었다.

• 대한치과보철학회지
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• 제54권2호
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• pp.167-171
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• 2016

상악골 부분 절제술을 시행한 환자들은 저작, 발음, 연하 기능에 문제가 발생하고 안모의 변화로 인해 사회적, 심리적인 어려움을 겪게 된다. 따라서 악안면 보철적 치료를 통한 기능적, 심미적 회복이 매우 중요하다. 적절한 폐쇄 장치는 구개의 외형을 회복시키고 구강과 비강, 상악동, 비인두를 분리시킴으로써 연하와 발음 기능을 회복시키는데 목적이 있다. 본 증례는 편평상피암으로 인해 우측 상악 구치부에서 비인두에 이르기까지 상악골 부분 절제술을 시행한 환자에서 폐쇄장치를 제작하였다. 이를 통해 발음 및 연하 기능을 회복하고 저작 기능의 향상을 도모하였으며 심미적인 부분에서 개선이 이루어졌다. 1년간의 임상적 관찰기간 동안 만족스러운 결과를 얻었기에 이를 보고하고자 한다.

• 한국임상수의학회지
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• 제30권2호
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• pp.134-137
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• 2013

4개월 된 수컷 진도 견에서 좌측 후지 파행이 발생하였다. 방사선 검사에서 양측 경골 견인 골단 아래 작은 골편이 관찰되었으나, 견인 골단의 변위는 없었다. 그 후 양측 경골 조면 부위의 골밀도는 방사선 투과성에서 비투과성으로 변화하였다. 좌측 경골은 수술 후 회복되었으나, 우측 경골은 보존적 처치로 자가 치료되었다. 본 환자는 경골조면의 부분 견열골절로 진단되었으며, 이는 개에서 'Osgood-Schlatter disease'로 불려져 왔던 질환이다. 이 증례는 환자의 경골조면 부분 견열골절의 순차적인 방사선학적 영상 변화에 대한 유용한 임상적 정보를 제공할 수 있을 것으로 생각한다.

• Journal of Ecology and Environment
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• 제46권3호
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• pp.161-171
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• 2022

Background: Epilobium hirsutum L. is designated as an endangered plant in South Korea located in Asia, due to the destruction of its habitats through the development of wetlands. Therefore, in this study, in order to find a light condition suitable for the growth and ecophysiological responses of Epilobium hirsutum L., those of this plant under treatment with various light qualities in a smart farm were measured. Results: In order to examine the changes in the physiological and growth responses of Epilobium hirsutum L. according to the light qualities, the treatment with light qualities of the smart farm was carried out using the red light: blue light irradiation time ratios of 1:1, 1:1/2, and 1:1/5 and a red light: blue light: white light irradiation time ratio of 1:1:1. As a result, the ecophysiological responses (difference between leaf temperature and atmospheric temperature, transpiration rate, net photosynthetic rate, intercellular CO₂ partial pressure, photosynthetic quantum efficiency) to light qualities appeared differently according to the treatments with light qualities. The increase in the blue light ratio increased the difference between the leaf temperature and the atmospheric temperature and the photosynthetic quantum efficiency and decreased the transpiration rate and the intercellular CO₂ partial pressure. On the other hand, the white light treatment increased the transpiration rate and intercellular CO₂ partial pressure and decreased the temperature difference between the leaf temperature and the ambient temperature and photosynthetic quantum efficiency. Conclusions: The light condition suitable for the propagation by the stolons, which are the propagules of Epilobium hirsutum L., in the smart farm, is red, blue and white mixed light with high net photosynthetic rates and low difference between leaf temperature and atmospheric temperature.

• 한국전기전자재료학회논문지
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• 제35권6호
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• pp.594-602
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• 2022

Cast-resin transformers are widely installed in various electrical power systems because of their low operating cost and low influence on external environmental factors. However, when they have an internal defect during the manufacturing process or operation, a partial discharge (PD) occurs, and eventually destroys the insulation. In this paper, a Rogowski-type PD sensor was studied to replace commercial PD sensors used for the insulation diagnosis of power apparatus. The proposed PD sensor was manufactured with four different types of PCB-based winding structures, and it was analyzed in terms of the detection characteristics for standard calibration pulses and the changes of the output voltage according to the distance. The output increased linearly in accordance with the applied discharge amount. It was confirmed that the hexagon structure sensor had the highest sensitivity, because the winding cross-sectional area of the sensor was larger than others. In addition, as the distance from the defect increased, the output voltage of the sensors decreased by 7.32% on average. It was also confirmed that the attenuation rate according to the distance decreased as the input discharge amount increased. For the application of this new type sensor, PD electrode system was designed to simulate the void defect. Waveforms and PRPD patterns measured by the proposed PD sensors at DIV and 120% of DIV were the same as the results measured by MPD 600 based on IEC 60270. The proposed PD sensors can be installed on the inner wall of the transformer tank by coating its surfaces with a non-conductive material; therefore, it is possible to detect internal defects more effectively at a closer distance from the defect than the conventional sensors.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1388-1395
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• 2009

In March 2007, Korea's Ministry of Construction & Transportation (MOCT) established "Guidelines on the Computerization and Use of Geotechnical Investigation Results," which took effect as official instructions. The 2007 Geotechnical Information DB Construction Project is underway as a model project for a stable geotechnical information distribution system based on the MOCT guidelines, accompanied by user education on the geotechnical data distribution system. This study introduces a geotechnical data entry system characterized by the standardization of the geotechnical investigation form, the standardization of metadata for creating the geotechnical data to be distributed, and the creation of borehole space data based on the world geodetic system according to the changes in the national coordinate system, to define a unified DB structure and the items for the geotechnical data entry system and to computerize the field geotechnical investigation results using the MOCT guidelines. In addition, the present operating status of the geotechnical data entry system and entry data processing statistics are introduced through an analysis of the model project, and the problems of the project are analyzed to suggest improvements. Education on, and the implementation of, the model project for the geotechnical data entry system, which was developed via the standardization of the geotechnical investigation results form and the metadata for institutions showed that most users can use the system easily. There were problems, however, including those related to the complexity of metadata creation, partial errors in moving to the borehole data window, partial recognition errors in the installation program for different computer operating systems, etc. Especially, the individual standard form usage and the specificity of the person who enters the geotechnical information for the Korea National Housing Corporation, among the institutions under MOCT, required partial improvement of the geotechnical data entry system. The problems surfaced from this study will be promptly addressed in the operation and management of the geotechnical data DB center in 2008.

• 한국식품영양과학회지
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• 제13권4호
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• pp.451-458
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• 1984

18% casein식(食)을 대조식이(對照食餌)로 하여 분지쇄(分枝?) 아미노산(Leu. lie. Val.)을 첨가(添加)한 실험식이(實驗食餌)의 간부분절제후(肝部分切除後)의 Rat에 대한 영양학적(營養學約) 효과(效果)를 검토(檢討)하였다. 자유채취(自由攝取)시키면, 실험식이군(寶驗食餌群)은 대조식이군(對照食餌群)에 비하여 6일(日)째까지 식이채취량(食餌攝取量)이 적지만, 8 일(日)째부터는 증가하고 체중증가(體重增加)도 그와 평행하였다. 14 일(日)째에 간(肝)의 부분절제(部分切除)를 행하면, 7 일후의 체중(體重)은 식이채취량(食餌攝取量)은 동일(同一)하면서도 실험식이군(實驗食餌群)에서 유의(有意)하게 증가(增加)하였다. 또한 간부분절제후(肝部分切除後) 5 일(日)째의 간재생중량(肝再生重量) 및 간재생지수(肝再生指數)도 유의(有意)하게 증가(增加)를 나타내었다. 이상으로 보아, 분지쇄(分枝?)아미노산 첨가식이(添加食餌)는 재생간(再生肝) Rat에 대하여 체중증가(體重增加) 및 간재생(肝再生) 보호작용(促進作用)에 있어서 영양학적(營養學論) 효과(效果)가 있다는 것이 인정(認定)된다.

• KSBB Journal
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• 제29권1호
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• pp.58-66
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• 2014

Demand for in vitro pharmacological evaluation and toxicity test using human hepatocytes has been increasing. In USA and Europe, human hepatocytes obtained from donated whole liver unsuitable for transplantation were distributed to researchers and deposited in cell bank facility as cryopreserved vial. In Korea, however, incidence of transplantation- inappropriate whole liver has been quite low and the whole livers almost have so severe liver disease such as fatty or fibrotic liver that cannot meet the demand. In this study we aimed to isolate human hepatocytes from liver resection surgery-originated partial liver, and assure the isolated human hepatocytes and its cryopreserved hepatocytes to be qualified for the in vitro pharmacological evaluation and drug toxicity tests. We compared those with commercially available human hepatocyte, BD $GenTest^{TM}$ by cell morphology, hepatic gene expression, urea synthesis, albumin secretion, ammonia removal, and cytochrome P450 induction activities. Changes in hepatotoxic gene expression after cryopreservation are evaluated with a typical hepatotoxic drug, acetaminophen. Consequently, the fresh hepatocytes from the partial liver and its cryopreserved hepatocytes expressed their intrinsic hepatic functions well and showed equal hepatotoxicity gene expression trend regardless to cryopreservation. Therefore, liver resection surgery-originated partial liver can be used as a useful source of human hepatocytes for various pharmacological and hepatotoxicity test.