대형 DME버스의 연비 및 배기가스 특성에 관한 연구

오용일(Yong Il Oh),표영덕(Young Duk Pyo),권옥배(Ock Bae Kwon),백영순(Young Sun Beak),조상현(Sang Hyun Cho),임옥택(Ock Taeck Lim) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.4

본 연구에서는 대형버스 배기가스 테스트 모드인 JE-05 에서 DME와 디젤을 연료로 사용하는 대형 DME버스를 차대동력계, 배기가스 분석기 그리고 PM 측정시스템을 이용하여 대형 DME버스의 연비, 배기가스특성 그리고 동적 특성에 대해 알아보았다. 대형 DME버스에는 6기통 8,071cc 디젤엔진이 장착되었으며, 현재 운행되고 있는 상용 디젤버스와는 달리 DOC, DPF와 같은 후처리 장치가 없다. 실험 결과, 각 부하에 따른 차량의 속도를 통하여 차량의 동적 특성은 DME와 디젤을 사용했을 때 거의 비슷한 것을 알 수 있었다. NOx, CO와 THC는 DME를 연료로 사용 시 디젤연료에 비해 더 적게 배출되는 것을 확인하였다. 하지만 PM은 DME연료를 사용 시 거의 발생하지 않았는데, 이는 DME가 함산소연료이고 분자구조상 탄소-탄소 결합이 없기 때문이라고 생각된다. CO₂는 각 연료 사용 시 비슷하게 발생하였으며, 저위발열량 베이스로 계산된 연비는 DME연료 사용 시 디젤연료보다 약 6.7% 더 낮게 나왔다. The experimental test was conducted for a heavy-duty DME bus in JE-05 exhaust gas test mode using a chassis dynamometer, exhaust gas analyzers, and a PM measurement system. The heavy-duty DME bus was not equipped with after-treatment systems such as DOC or DPF. The dynamic behavior, emission characteristics, and fuel economy of the bus were investigated with an 8.0-liter, 6-cylinder conventional diesel engine. The results showed that the dynamic behavior in DME mode was almost the same as in diesel mode. However, there was little difference among the two operation modes for NOx and CO emissions. THC emissions were lower for DME mode than for diesel mode. Also, the amount of PM emissions was remarkably lower than for the diesel mode because DME contains a greater amount of oxygen than diesel. The data showed that CO₂ emissions were almost similar in the two modes but fuel economy (calculated using heating value) was lower for DME mode than for diesel mode.

폐암발생과 Glutathione S-transferase M1, T1 및 N-acetyltransferase 1의 유전적 다형성과의 연관성에 관한 연구

이승준 ( Seung Joon Lee ),박계영 ( Gye Young Park ),오연목 ( Yeon Mok Oh ),강대희 ( Dae Hee Kang ),조수헌 ( Soo Hun Cho ),김수웅 ( Soo Ung Kim ),유철규 ( Chul Gyu Yoo ),이춘택 ( Chun Taeck Lee ),김영환 ( Young Whan Kim ),한성구 ( 대한결핵 및 호흡기학회 1999 Tuberculosis and Respiratory Diseases Vol.47 No.4

우황청심원의 고문헌기록 및 실험적 연구결과 분석을 통한 임상응용 확대의 필요성 고찰

오영택,오현묵,김서우,김원용,손창규,조정효,Oh, Young-Taeck,Oh, Hyeon-Muk,Kim, Seo-Woo,Kim, Won-Yong,Son, Chang-Gue,Cho, Jung-Hyo 대전대학교 한의학연구소 2017 혜화의학회지 Vol.26 No.1

Objectives: The aim of this study is (1) to investigate the historic changes and pharmacological efficacies of Woohwangchungsim-won and (2) to discuss the necessities for Woohwangchungsim-won's clinical applications. Methods: This study was performed through (1) investigating the ancient literature records related with Woohwangchungsim-won and analyzing Woohwangchungsim-won's composition, dosage and indications, (2) searching articles about Woohwangchungsim-won on 10 major Korean web and 3 major foreign web article search engines and analyzing Woohwangchungsim-won's pharmacological efficacies and indications. Results: Woohwangchungsim-wom has been used for cerebrovascular diseases such as stroke and palpitation. Also, there are some ancient literature records of Woohwangchungsim-won's clinical applications in neuropsychiatric disorders such as depression and bipolar disorder. In addition, there have been a number of experimental studies which demonstrate Woohwangchungsim-won's neuroprotective effect on cerebral cortex and hippocampus injury. So, it is possible to infer that Woohwangchungsim-won can be used for the treatments of neuropsychiatric disorders associated with neuronal cell death in cerebral cortex and hippocampus. But there have been no or less experimental studies which demonstrate the pharmacological efficacy of Woohwangchungsim-won on such disease. Conclusion: It is necessary that further experimental studies which demonstrate Woohwangchungsim-won's pharmacological efficacy on neuropsychiatric disorders should be done and Woohwangchungsim-won's clinical applications should be expanded on the basis of those related experimental results.

Protein Electrophoresis Fraction in Serum of the Rural Elderly Patient

Kim Chong-Ho,Park Chung-Oh,Kang Young-Tae,Park Seung-Taeck The Korean Society for Biomedical Laboratory Scien 2006 Journal of biomedical laboratory sciences Vol.12 No.3

We analyzed total protein (TP), albumin (AL), aspartic aminotransferase (AST), alanine aminotransferase (ALT), urea nitrogen (UN), creatinine (CRE) and serum protein electrophoretic fractions in sera of rural elderly patients to evaluate the health status in rural elderly patients. We observed that the frequencies of patients showed lower level of total protein, albumin, and both total protein and albumin than them of reference range were 20.3%, 22.8% and 19.0%, respectively. The rates of patients showed higher level of AST, ALT, both of AST and ALT, UN, creatinine and both of UN and creatinine than them of reference range were 33.8%, 40.0%, 30.0%, 17.7%, 15.2% and 7.9%, respectively. Comparison of protein fractions of each patient to reference range showed that 77.2% of patients showed normal in all of patterns. Few of patients showed abnormal pattern in albumin (13.6%), ${\alpha}1-globulin (0.0%),\;{\alpha}_2-g10bulin(1.1%),\;{\beta}-globulin(1.9%)\;and\;{\gamma}-globulin(6.2%)$. These data suggest that many of rural elderly patients may suffer from heart, liver and kidney diseases. The serum protein fractions are not typical criterion to evaluate the disease, but production of proteins in rural elderly patients may be affected by liver disease and kidney disease.

우울증의 병태생리에 관한 동서의학적 비교

오현묵,김서우,오영택,손창규,이진석,Oh, Hyeon-Muk,Kim, Seo-Woo,Oh, Young-Taeck,Son, Chang-Gue,Lee, Jin-Seok 대전대학교 한의학연구소 2017 혜화의학회지 Vol.26 No.1

Objective: This study aims to summarize recent findings of depression and compare the physiopathology of depression by conventional medicine and Korean medicine. Methods: A literature search of PubMed and Journal of Oriental Neuropsychiatry was conducted. This study analyzes the physiopathology of depression. Results: Despite difference of the viewpoints between conventional medicine and Korean medicine, etiology and symptoms of depression are similar. Recent findings of depression partly accord with Korean medicine theory. Conclusion: Physiopathology of depression has yet to be completely understood and current treatments remain ineffective in a large subset of patients. As the efficacy of Korean medicine against depression is demonstrating recently, understanding the viewpoints of Korean medicine will provide new perspectives and hints for further research and therapeutic development.

모체태아의학 : OB-28 ; Clinical profiles and outcomes in peripartum cardiomyopathy

( Seung Hyeong Lee ),( Joo Hyun Choi ),( Yong Taeck Oh ),( Yoon Jin Cho ),( Mi Seung Shin ),( Suk Young Kim ) 대한산부인과학회 2014 대한산부인과학회 학술대회 Vol.100 No.-

목적: To investigate clinical profiles and maternal outcomes of peripartum cardiomyopathy (PPCM) and to predict the effect of subsequent pregnancy and their prognosis. 방법: This observational study involved women diagnose as PPCM between Jan. 2010 and Sep. 2014. Age, parity, gestational weeks at birth, mode of delivery and presence of risk factors to develop PPCM were investigated retrospectively. To evaluate the severity of PPCM, the pattern of ejection fraction (EF) in left ventricle (LV), end diastolic diameter in LV (LVEDD), and various laboratory results including proBNP, CKMP, troponin1 and hsCRP were observed. To analyze the effect on prognosis of PPCM, we had investigated 2 cases of the subsequent pregnancy and whether to experience of nursing in women with PPCM. 결과: There were 6 cases in PPCM. One occurred before birth and the others occurred between 1 and 7 days after birth. Preeclampsia, twin, use of tocolytics and anemia were revealed the underlying causes, but no risk factors were identified in 2 cases. All cases were suffered dyspnea and represented pulmonary edema (4) and pleural effusion (3) in chest PA. There were 35% of mean EF in LV and 54 mm of LVEDD in echocardiography. Three of 6 cases in PPCM were returned normal findings of echocardiography within 4 months. Hs-CRP and ProBNP levels were elevated in all cases of PPCM. There were no maternal death and had taken medications as diuretics beta-blocker, ACE-inhibitor, and ARBs. Because of medication, 5 cases gave up the lactation but only one continued breast feeding during taking medication. There were 2 cases of subsequent pregnancy where one was nursing and the other was not. Both pregnancy outcomes and maternal condition were favorable. 결론: With multidisciplinary team therapy, a good clinical outcome is more common compared with other types of cardiomyopathy. Further researches between nursing and severity in PPCM and between subsequent pregnancy and prognosis in PPCM might be required.

카드뮴에 의한 희돌기교세포의 손상에 대한 牛膝의 영향

이재규,이은미,오석규,손영우,유교상,김상수,이정헌,이강창,한두석,이승현,박승택,김요한,송호준 대한동의생리학회,대한동의병리학회 2001 동의생리병리학회지 Vol.15 No.6

In order to clarify the cytotoxic effect of cadmium in cultured oligodendrocytes of neonatal mouse, the cytotoxicity was measured by MTX assay in cultured cells treated with 1∼20uM CdCl_2 for 24 hours. And also, the protective effect of Achyranthis Bidentazae Radix(ABR) was examined by cell viability in these cultures. Cell viability was significantly decreased in a dose-and time-dependent manner after exposure of cultured oligodendrocytes to 10uM CdCl_2 for 24 hours. Protective effect of ABR on CdCl_2-mediated toxicity was very effective in these cultures. From above the results, it suggests that CdCl_2 is toxic in cultured oligodendrocytes and selective herb extract such as ABR is effective in protection of the CdCl_2 -induced cytoxicity.

쇼트피닝횟수가 잔류응력분포에 미치는 영향

김태우(TAEWOO Kim),이원범(Won-Beom Lee),오영택(Young Taeck Oh),이영석(Y.Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5

We calculated residual stress distribution in terms of depth from carbons steel surface as the number of shot balls and repetitive impact cycle increases. A bundle of balls, i.e., four, five and eight were impacted repetitively. We calculated residual compressive stress as the repetitive impact cycle increases from one, four, sixteen up to twenty-four, respectively. If impact by the repetitive impact cycle was more than 16-cycle, residual compressive stress distribution converged almost. The magnitude of residual compressive stress increased with coverage increased. As the number of shot balls increases in a given repetitive impact cycle, the magnitude of residual compressive stress by rigid body shot ball is larger than that by deformable shot ball.

Hyperkalemia Detection in Emergency Departments Using Initial ECGs: A Smartphone AI ECG Analyzer vs. Board-Certified Physicians

Kim Donghoon,Jeong Joo,Kim Joonghee,Cho Youngjin,Park Inwon,Lee Sang-Min,Oh Young Taeck,Baek Sumin,Kang Dongin,Lee Eunkyoung,Jeong Bumi 대한의학회 2023 Journal of Korean medical science Vol.38 No.45

Background: Hyperkalemia is a potentially fatal condition that mandates rapid identification in emergency departments (EDs). Although a 12-lead electrocardiogram (ECG) can indicate hyperkalemia, subtle changes in the ECG often pose detection challenges. An artificial intelligence application that accurately assesses hyperkalemia risk from ECGs could revolutionize patient screening and treatment. We aimed to evaluate the efficacy and reliability of a smartphone application, which utilizes camera-captured ECG images, in quantifying hyperkalemia risk compared to human experts. Methods: We performed a retrospective analysis of ED hyperkalemic patients (serum potassium ≥ 6 mmol/L) and their age- and sex-matched non-hyperkalemic controls. The application was tested by five users and its performance was compared to five board-certified emergency physicians (EPs). Results: Our study included 125 patients. The area under the curve (AUC)-receiver operating characteristic of the application’s output was nearly identical among the users, ranging from 0.898 to 0.904 (median: 0.902), indicating almost perfect interrater agreement (Fleiss’ kappa 0.948). The application demonstrated high sensitivity (0.797), specificity (0.934), negative predictive value (NPV) (0.815), and positive predictive value (PPV) (0.927). In contrast, the EPs showed moderate interrater agreement (Fleiss’ kappa 0.551), and their consensus score had a significantly lower AUC of 0.662. The physicians’ consensus demonstrated a sensitivity of 0.203, specificity of 0.934, NPV of 0.527, and PPV of 0.765. Notably, this performance difference remained significant regardless of patients’ sex and age (P < 0.001 for both). Conclusion: Our findings suggest that a smartphone application can accurately and reliably quantify hyperkalemia risk using initial ECGs in the ED.

유기인계 중독 환자에서 알코올이 사망률에 미치는 효과

민용훈 ( Yong Hun Min ),박승민 ( Seung Min Park ),이귀자 ( Kui Ja Lee ),오영택 ( Young Taeck Oh ),안희철 ( Hee Cheol Ahn ),손유동 ( You Dong Sohn ),안지윤 ( Ji Yun Ahn ),이영환 ( Young Hwan Lee ),하상욱 ( Sang Ook Ha ),김유정 ( Yu 대한임상독성학회 2015 대한임상독성학회지 Vol.13 No.1

Purpose: Many patients who are acutely poisoned with organophosphorus pesticides have co-ingested alcohol. The purpose of this study was to identify the factors that influence mortality in organophosphate intoxication and the differences between alcohol coingested patients and non-coingested patients, looking at vital signs, length of admission, cholinesterase activity, complications, and mortality. Methods: All patients visiting one Emergency Department (ED) with organophosphate intoxication between January 2000 and December 2012 were reviewed retrospectively. The patients were divided into two groups, alcohol coingested group and non-coingested group. Results: During the study period, 136 patients (alcohol coingested group, 95 patients; non-coingested group, 41 patients) presented to the ED with organophosphate intoxication. Seventy-one alcohol coingested patients (74.1%) vs. 16 non-coingested patients (39.0%) received endotracheal intubation, with results of the analysis showing a clear distinction between the two groups (p=0.001). Twenty-three alcohol coingested patients (24.2%) vs. 1 non-coingested patient (2.4%) required inotropics, indicating a significant gap (p=0.002). Twenty-eight alcohol coingested patients (29.5%) vs. 2 non-coingested patients (4.9%) died, with results of the analysis showing a clear distinction between the two groups (p=0.002). Conclusion: In cases of organophosphate intoxication, alcohol coingested patients tended to receive endotracheal intubation, went into shock, developed central nervous system complications, and more died.