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API X70 및 X80급 라인파이프강의 준정적 및 동적 비틀림 변형 거동
김용진 ( Young Jin Kim ),김양곤 ( Yang Gon Kim ),신상용 ( Sang Youg Shiu ),이성학 ( Sung Hak Lee ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.1
This study aimed at investigating quasi-static and dynamic torsional deformation behavior of three API X70 and X80 linepipe steels. Quasi-static and dynamic torsional tests were conducted on these steels. having different grain sizes and volume fractions of acicular ferrite and polygonal ferrite, using a torsional Kolsky bar. The test data were then compared via microstructures and adiabatic shear band formation. The dynamic torsional test results indicated that the steels rolled in the single phase region had higher maximum shear stress than the steel rolled in the two phase region, because the microstructures of the steel rolled in the single phase region were composed mainly of acicular ferrites. In the X80 steel rolled in the single phase region. the increased dynamic torsional properties could he explained by a decrease in the overall effective grain size due to the presence of acicular ferrite having smaller effective grain size. The possibility of adiabatic shear hand formation was analyzed from the energy required for void initiation and variation in effective grain size.
조기양막파수 임신부에서 Dexamethasone 다회 투여가 임신부 및 신생아의 주산기 결과에 미치는 영향
김태중(Tae Joong Kim),김우영(Woo Youg Kim),유진경(Jin Kyung You),황종대(Jong Dae Whang),양순하(Soon Ha Yang),이제호(Je Ho Lee),노정래(Cheong Rae Roh) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.9
목적 : 조기양막파수 임신부에서 산전 dexamethasone 투여가 신생아 호흡곤란증후군과 조기발생 신생아 패혈증 및 융모양막염에 미치는 영향을 알아보고자 하였다.연구 대상 및 방법 : 임신 24주에서34주 사이의 조기양막파수로 삼성서울병원에 입원한 임신부를 대상으로 후향적 연구를 시행하였다. 연구 대상 산모를 dexamethasone 투여횟수에 따라 세 군으로 분류하였다 : (1) 산전 dexamethasone 을 투여받지 않은 군 (대조군) (2) 5mg dexamethasone 4회를 12시간 간격으로 근주 또는 정주 투여받은 군 (1회 요법) (3) 초기 1회 요법이 끝난 후 1주 간격으로 dexamethasone 추가 투여받은 군 (다회 요법). 모든 산모들은 예방적 항생제를 투여받았다. 불연속 변량은 Chi-squre test, 연속 변량은 analysis of variance를 통해 세 군간의 차이를 검정하였다. 교란변수의 영향을 보정하기 위해 다중 로지스틱 회귀분석(multiple logistic regression analysis)을 사용하였는데 조기발생 신생아 패혈증 및 융모양막염의 위험인자로 여겨지는 변수들을 독립변수로 조기발생 신생아 패혈증와 융모양막염을 각각 종속변수로 삼아 통계분석을 하였다. P<0.05 이면 통계적으로 유의하다고 간주하였다.결과 : 129명의 조기양막파수 임신부가 연구대상에 포함되었는데, 대조군 37명, 일회 요법군 68명, 다회 요법군 24명이었다. 신생아 호흡곤란증후군과 융모양막염 및 조기발생 신생아 패혈증의 발생 빈도는 산전 dexamethasone 투여횟수와 상관성이 없었다.결론 : 조기양막파수에서 산전 dexamethasone 투여횟수에 따라 신생아 호흡곤란증후군이 감소되거나 신생아 및 모체 감염이 증가되지 않는다. Objective : To determine the effect of antenatal dexamethasone exposure on the incidence of neonatal respiratory distress syndrome (RDS), early-onset neonatal sepsis and maternal chorioamnionitis in patients with preterm premature rupture of membranes.Methods : We performed a retrospective analysis of mothers admitted between 24 and 34 weeks' gestation after preterm premature rupture of membranes. Patients with preterm premature rupture of membranes were categorized into 3 groups on the basis of the following dexamethasone exposures: (1) none (control subjects), (2) four 5-mg doses in a 12-hour interval on admission (single course), and (3) weekly administration after the initial single course (multiple courses). All included patients received prophylactic antibiotics. Discrete data were tested for significance with the x2 test. Continuous data were tested for significance with an analysis of variance. Multiple logistic regression analysis was performed to determine the confounding effect of the multiple variables that were considered as risk factors for early-onset neonatal sepsis and maternal chorioamnionitis. All P value of <.05 were considered significant. Results : One hundred twenty nine patients with preterm premature rupture of membranes were included, 37 of whom were evaluated in the control group, 68 in the single-course group, and 24 in the group receiving multiple courses of dexamethasone. The incidence of neonatal RDS, chorioamnionitis and early-onset neonatal sepsis were not associated with the number of antenatal dexamethasone exposures.Conclusions : Multiple courses of antenatal dexamethasone administered to patients with preterm premature rupture of membranes is not associated with a decreased risk of neonatal RDS and an increased risk of early-onset neonatal sepsis and maternal chorioamnionitis.
가변적인 PID 이득에 기초한 풍력발전 시스템의 피치제어
고정민(Jung-Min Ko),양수형(Soo-Youg Yang),부창진(Chang-Jin Boo),김호찬(Ho-Chan Kim),허종철(Jong-Chul Huh),이정훈(Junghoon Lee),강민제(Min-Jae Kang) 한국지능시스템학회 2013 한국지능시스템학회논문지 Vol.23 No.1
정격풍속이상에서 발전기의 출력을 일정하게 유지하기 위하여 PID에 기초한 다양한 종류의 방법들이 발표되었다. 그러나 고정된 PID 이득을 이용한 이러한 방법에서는 전 영역에서 동작하리라는 보장이 없다. 이 논문에서는 전 영역에서 동작하는 시스템을 설계하기 위하여 풍속의 강도에 따라 PID 이득이 변하는 방법을 제안하였다. 풍속의 강도에 따라 피치각에 따른 전력의 민감도는 계속 변하는데, PID 이득을 민감도의 함수로 유도하였다. For regulating generator speed above the rated wind, versatile methods have been published based on PID. However, these methods with the fixed PID gains could not guarantee that the controller works well in the whole area. In this paper, variable PID gain method has been suggested to overcome this problem. The sensitivity of power to blade pitch angle changes according to wind speed. The variable PID gain function has been derived from this sensitivity.
정지봉(Ji Bong Jeong),양용모(Youg Mo Yang),전원중(Won Joong Jeon),서정철(Jeong Chul Seo),이경수,이현희(Hyun Hee Lee),고병성(Byeong Seong Ko),채희복(Hee Bok Chae),박선미(Seon Mee Park),윤세진(Sei Jin Youn) 대한소화기기능성질환·운동학회 2000 Journal of Neurogastroenterology and Motility (JNM Vol.6 No.1
N/A Background/Aims: The purpose of this study was to discover the physiologic difference of a postprandial motor response in different segments of the colon between patients with irritable bowel syndrome and healthy subjects. Methods: Irritable bowel syndrome patients are categorized into three groups according to their main symptoms; loose stool-dominant (A, n=5), abdominal pain-dominant (B, n=5), constipation-dominant (C, n=6) and the normal control group (n=5). The intraluminal pressure activity was measured with a colonoscopically positioned multilumen manometric catheter. The change of the colonic motility index (MI) is presented as a percent change (mean±SE%) over the basal period in response to a meal. Results: 1) In the transverse, descending and sigmoid colon of healthy subjects, the percentage changes in the basal Ml during the first 30 min after the meal are significantly increased (p<0.05-0.01). 2) In the sigmoid colon, the percentage changes in the basal MI during the first 30 min after the meal were 62±18 in A, 29±18 in B, 12±8 in C and 306±l02% in heathy subjects respectively, which shows a significant difference between the MI of control and healthy subjects (p<0.05). 3) In B and C, the percentage changes in the l MI during the first 30 min after the meal in the descending colon were 105±38, 11±7, respectively, which shows a significant difference between the two groups (p<0.05). In A and C, the percentage changes in the basal MI during the first 30 min after the meal in the sigmoid colon was 62±18, 12±8, respectively, which shows a significant change between the two groups (p<0.05). Conclusion: This study suggests that postprandial intraluminal pressure differences play a role in the pathophysiology of irritable bowel syndrome. (Korean Journal of Gastrointestinal Motility 2(00;6:20-31)
이철우(Cheul Woo Lee),노현주(Hyun Ju Noh),민정기(Jung Ki Min),양은영(Dun Youg Yang),신용덕(Yong Duk Shin),김동진(Dong Jin Kim) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.9
36 years old women, who had cesarean section delivery in a local clinic, was transferred to our hospital in state of hypovolemic shock. After transfusion and hysterectomy, vital sign is stable and she is gradually recovering her general condition. Seven days after operation, she complained of a headache, general weakness, slurred speech and laboratory finding was syndrome of inappropriate secretion of antidiuretic hormone. Fluid restriction and hypertonic saline infusion resulted in no significant change in the blood sodium level. So, we performed basal hormone study and combined pituitary function test, the result is panhypopituitarism. Hyponatremia is corrected by administrated glucocorticoid. Sheehan's syndrome should be considered in the differential diagnosis of hyponatremia in the early postpartum period.