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하이브리드 로켓의 추력제어를 위한 산화제 유량제어 연구
김계환,문근환,김진곤,문희장,Kim, Kye-Hwan,Moon, Keun-Hwan,Kim, Jin-Kon,Moon, Hee-Jang 한국항공운항학회 2014 한국항공운항학회지 Vol.22 No.4
In this study, control of oxidizer mass flow rate and verification of control system were performed for hybrid rocket thrust control application. Oxidizer flow control system consists of ball valve and stepping motor where gaseous oxygen was used for oxidizer at feeding pressure of 10, 20 and 30 bar. According to experimental results, the oxidizer mass flow rate showed a relatively linear increment as ball valve open angle increases regardless of feeding pressure. In addition, the level of the oxidizer flow rate was kept almost constant at each sequence of flow control with ball valve during the 20 seconds of operation.
조현병 및 조현정동장애 입원환자에서 혈청 염증표지자와 정신병적 증상과의 관련성
김계환,이건석,김수진,이은규,송열매,박진영,Kim, Kye Hwan,Lee, Kounseok,Kim, Su Jin,Lee, Eun Kyu,Song, Yul-Mai,Park, Jin Young 대한생물정신의학회 2012 생물정신의학 Vol.19 No.4
Objectives Despite the growing research interest in the role of immunological markers in schizophrenia, a few studies, with conflicting results, have focused on the association between high sensitivity C-reactive protein (hs-CRP) levels and clinical characteristics in schizophrenia. The aim of the present study was to examine the association of serum hs-CRP with psychopathology in schizophrenia. Methods Fifty-five inpatients with schizophrenia or schizoaffective disorder were enrolled. Serum levels of hs-CRP were measured, and each patient was assessed with the Korean version of the Positive and Negative Syndrome Scale (PANSS). Results In correlation analysis of hs-CRP with PANSS subscales, positive subscale score has significant positive correlation (r = 0.271, p = 0.046). In independent t-test analysis, subjects with hs-CRP > 0.3 mg/dL (elevated CRP group, n = 43) had significantly higher PANSS positive subscale score (t = -3.273, df = 24.107, p = 0.003) than those with hs-CRP ${\leq}$ 0.3 mg/dL (normal CRP group, n = 12). Conclusions Elevated serum levels of high sensitivity C-reactive protein in schizophrenia are associated with the severity of psychotic symptoms.
심부전 환자에서 발생한 반복적인 자발성 저혈당과 의식저하
김계환 ( Kye Hwan Kim ),김완철 ( Wan Chul Kim ),이은주 ( Eun Ju Lee ),고진신 ( Jin Sin Koh ),박정랑 ( Jeong Rang Park ),함종렬 ( Jong Ryeal Hahm ),황진용 ( Jin Yong Hwang ) 대한내과학회 2014 대한내과학회지 Vol.87 No.2
Hypoglycemia in adults without diabetes can be caused by drugs, critical illness, hormone deficiency, and hyperinsulinism. Spontaneous hypoglycemia in congestive heart failure has been reported rarely in adults. We report a case of spontaneous hypoglycemia in congestive heart failure in a 73-year-old woman with mitral stenosis and atrial fibrillation who had been receiving treatment for 6 years. She had two episodes of low serum glucose with unconsciousness, but there was no evidence of diabetes. Heart failure with concomitant hepatic dysfunction was presumed to have caused the hypoglycemia. She underwent mitral valve replacement after being diagnosed with severe mitral stenosis. There was no episode of hypoglycemia during follow-up. (Korean J Med 2014;87:205-208)