Halothane과 Enflurane 마취 전후에 있어서의 간기능 검사 비교

김승수,김동국,김광모,신재철,권병연 대한마취과학회 1982 Korean Journal of Anesthesiology Vol.15 No.2

The problem of hepatotoxicity of clinically employed halogenated inhalation anesthetics has major implications for the practice of anesthesiology. Because of emerging disadvantages with all the available anesthetics, chemists continue to search for better compounds. In 1963 Terrel synthesized enflurane and many anesthesiologist used it, hoping to avoid the disavantage of halothane. This study was undertaken to investigate the advantage of enflurane as compared to the disadvantage of halothane, by comparing of pre- and post-operative liver functions of 16 cases of halothane use and 16 cases of enflurane use. In this study, all cases physical status were all ASA class 1, and excluded patients who had any liver disease, jaundice, previous experience of halothane or enflurance anesthesia, and who had not been transfused during this study. The result of this study which compared pre-operative and post-operative liver function tests disclosed statistically significant change in SGOT (p<0.02). On Table II the comparison of liver function tests between halothane and enflurane disclosed significant difference and that enflurance is less hepatotoxic than halothane. Considering the allergic or the intermediate by-product theory of the mechanism of halothane hepatotoxicity, it is desirable to avoid repeating the use of halothane in the near future. Thus, it seems to be safer to use enflurane instead of halothane.

VOC를 활용한 CNN 기반 전자상거래 이진 고객 행위 예측

김승수 대한산업공학회 2018 대한산업공학회 춘계학술대회논문집 Vol.2018 No.4

VOC를 활용한 CNN 기반 전자상거래 이진 고객 행위 예측

김승수 한국경영과학회 2018 한국경영과학회 학술대회논문집 Vol.2018 No.04

비만 폐쇄수면무호흡 환자에서 기계학습을 통한 적정양압 예측모형

김승수,양광익 대한수면연구학회 2018 Journal of sleep medicine Vol.15 No.2

The aim of this study was to develop a predicting model for the optimal continuous positive airway pressure (CPAP) for obstructive sleep apnea (OSA) patient with obesity by using a machine learning. Methods: We retrospectively investigated the medical records of 162 OSA patients who had obesity [body mass index (BMI) ≥ 25] and undertaken successful CPAP titration study. We divided the data to a training set (90%) and a test set (10%), randomly. We made a random forest model and a least absolute shrinkage and selection operator (lasso) regression model to predict the optimal pressure by using the training set, and then applied our models and previous reported equations to the test set. To compare the fitness of each models, we used a correlation coefficient (CC) and a mean absolute error (MAE). Results: The random forest model showed the best performance {CC 0.78 [95% confidence interval (CI) 0.43–0.93], MAE 1.20}. The lasso regression model also showed the improved result [CC 0.78 (95% CI 0.42–0.93), MAE 1.26] compared to the Hoffstein equation [CC 0.68 (95% CI 0.23–0.89), MAE 1.34] and the Choi’s equation [CC 0.72 (95% CI 0.30–0.90), MAE 1.40]. Conclusions: Our random forest model and lasso model (26.213+0.084×BMI+0.004×apnea-hypopnea index+0.004×oxygen desaturation index–0.215×mean oxygen saturation) showed the improved performance compared to the previous reported equations. The further study for other subgroup or phenotype of OSA is required.

한국 소아의 중등도 및 중증 폐쇄수면무호흡증후군 진단에서 McGill 야간 산소포화도 점수의 유용성

김승수,양광익 대한수면연구학회 2016 Journal of sleep medicine Vol.13 No.1

Objectives: We conducted this study to evaluate the utility of the McGill oximetry score (MOS) to rule out moderate to severe obstructive sleep apnea syndrome (OSAS) in Korean children. Methods: We performed a cross-sectional study by using medical and polysomnography (PSG) records from our sleep disorder center. We assessed 58 PSG records conducted from September 2011 to December 2015. MOS was calculated from the overnight oximetry tests performed as part of PSG. We also investigated age, gender, height zscore, weight z-score, body mass index z-score, obesity, underweight, and pediatric daytime sleepiness scale. Results: MOS revealed inconclusive (score 1) in 50 (68.2%), and abnormal (2–4) in 8 (13.8%) of PSG results. And moderate to severe OSAS were diagnosed in 20 (34.5%) records according to the apnea-hyponea index (≥5). In a multivariate logistic regression analysis, age [adjust odds ratio (OR) 0.8; p-value=0.013] and abnormal MOS (adjust OR 39.5; p-value=0.007) showed statistical significance between normal/mild OSAS group and moderate/severe OSAS group. MOS had a positive predictive value of 88%, a negative predictive value of 74%, a sensitivity of 35% and a specificity of 97% for detecting moderate/severe OSAS. Conclusions: In our small group study, MOS cannot exclude moderate to severe OSAS. Further prospective studies are needed.

미디어와 불평등의 변증법

김승수 한국언론정보학회 2016 한국언론정보학보 Vol.81 No.1

자본주의 생산방식은 상품경제, 이윤 극대화, 독점을 특징으로 하기 때문에, 재벌과 같은 괴물을 낳고 그 반대편에는 중소자본, 영세사업자가 대립하는 양극화 사회를 만든다. 이 때문에 불평등은 통제 불능 상태에 빠진다. 그런데도 정부나 국회는 불평등 문제를 그다지 심각하게 생각하지 않는 것 같다. 여기서 의문이 생긴다. 누군가 불평등을 정당화함으로써 시민들의 비판과 저항을 차단하는 것이 아닐까? 그래서 필자는 불평등과 미디어의 관계를 파악해보고자 하였다. 필자는 경제적·국가적·이념적 불평등이 사회 성격을 좌우하며, 이것들이 미디어 불평등의 근원임을 설명하였다. 미디어 정치경제학을 분석 도구로 삼아 자본주의 불평등은 미디어와 정보의 불평등을 초래하며, 미디어는 불평등을 재생산함으로써 자본주의를 정당화한다. This essay deals with the bulk of problems of media raised by social inequality. I attempted to examine the relationship between inequality and media/information. In adopting the method of political economy based on dialectical viewpoint, I argue that collaboration among Chaebol, media, power result in the media capitalism. This mode of production has brought about the decline of public service and democracy. It led the Korean industrial capitalism to media capitalism. This mechanism is a dominant but unfair system with grasping of wealth, power, information. The media capitalism, based on profit, privatizations, power monopoly, remains democracy and public service in retreat. Chaebol-media-power complex plays an important role in cementing the establishment. We are reminded how much the dominant system has deteriorated the public interests of the media market and information.

Solitary intraventricular hemorrhage without subarachnoid hemorrhage due to aneurysmal rupture: a case report

김승수,고경오,박현,이광호,Gyeong Hwa Ryu,백혜진,Seunguk Jung,Changhyo Yoon,Young Seop Park,황수현 대한뇌혈관외과학회 2019 Journal of Cerebrovascular and Endovascular Neuros Vol.21 No.1

The presence of primary intraventricular hemorrhage (IVH) without vascular lesion is very rare. We experienced solitary IVH without subarachnoid hemorrhage due to aneurysmal rupture in a 58-year-old man treated with coil embolization, which contributed to his good prognosis. After 33 days of hospitalization, he had mild right hemiplegic symptoms remaining, and he was transferred to a rehabilitation institute for further treatment. In cases of primary IVH, computed tomography angiography seems worthwhile for making a differential diagnosis, although the possibility of IVH due to cerebral aneurysmal rupture is very low. Endovascular intervention is a good option for diagnosis and treatment.

1LE-2 Pyrolysis kinetics and fast pyrolysis of pre-treated algal Saccharina Japonica

김승수,최재형,김진수,우희철 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

The effect of water-washed Saccharina japonica (S. japonica) samples on pyrolysis product distribution was studied at 360, 370 and 380°C with various residence times from 1.0 to 3.0 min. The kinetic rate constants of pyrolysis for untreated and water-washed S. japonica samples were determined using nonlinear least-squares regression of experimental data assuming first-order kinetics. As high mineral contents in S. japonica cause ash fouling or agglomeration of char and bed material in fluidized-bed reactor, S. japonica was water-washed as pretreatment to remove minerals and sticky materials. The yields of bio-oil were 25.57-31.27 wt% under the investigated pyrolysis conditions (temperature: 350-450°C; fluidization velocity: 2.0×U_mf-4.5×U_mf). The highest bio-oil yield (31.27 wt%) from water-washed S. japonica was obtained at 375°C and 4.0 U_mf, and the HHVs of the organic and aqueous phases in the bio-oil were 31.47 and 5.41 MJ/kg, respectively.

Least-squares method for the bubble stabilization by the Gauss-Newton method

김승수,이용훈,오은정 호남수학회 2016 호남수학학술지 Vol.38 No.1

In the discrete formulation of the bubble stabilized Legendre Galerkin methods, the system of equations includes the artificial viscosity term as the parameter. We investigate the estimation of this parameter to get the least-squares solution which minimizes the sum of the squares of errors at each node points. Some numerical results are reported.

발전부문에서의 대기오염물질 배출

김승수,정환삼 한국에너지학회 2017 한국에너지공학회 학술발표회 Vol.2017 No.9