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김형규,심재희,노정우 대한내과학회 1989 대한내과학회지 Vol.37 No.1
Spontaneous bacterial peritonitis developed in two ascitic patients with chronic renal failure on the intermittent hemodialysis management. It has been well known that spontaneous bacterial peritonitis develops frequently in patients with liver cirrhosis and nephrotic syndrome. but few cases of spontaneous bactrial peritonitis have developed in patients with hepatitis, malignant ascites and polycythemia vera, including chronic renal failure. Two cases reported revealed the clinical findings of acute peritonitis but there were no specific causes of peritonitis. One of them was confirmed and cured by exploratory laparotomy. Two cases of spontaneous bacterial peritonitis in patients with chronic renal failure are reported with a brief review of literature.
신질환 환자에서 Angiotensin Converting Enzyme Inhibitor와 Angiotensin Receptor Antaginist의 병합 사용에 관한 임상 연구
김형규,이소영,강영선,조원용,한상엽,윤종우,차대룡,조상경 대한신장학회 2000 Kidney Research and Clinical Practice Vol.19 No.6
Background: Angiotensin-converting enzyme inhibitors(ACEi) do not decrease plasma angiotensin II levels in chronic use to the same extent as in acute use. this reincrease in angiotensin II level is explained either by a renin-mediated reactive rise in plasma angiotensin I or by non-ACE dependent angiotensin II generation. The aim of this study was to compare the additive effects of an ACEi and angiotensin II receptor antagonist(AT1a) in antiproteinuric effect, hyperkalemia, and hypotension. Methods: 58 outpatients with chronic renal insufficiency were included and they were randomly classified into two groups: Group I(prescribed AT1a only), Group II(AT1a and ACEi combination therapy), and the changes of serum creatinine, the amount of proteinuria, the developement of hyperkalemia, and hypotension were evaluated. Results: In group I, the amount of proteinuria decreased to 92.8% of initial amount at 1 month after the start of drugs. 2 of 28 patients(7.1%) developed hyperkalemia, and serum creatinine did not change (1.686±1.415mg/dL 1.821±1.30lmg/dL, p=0.289). But in combination therapy group, serum creatinine level increased from baseline value of 1.466±0.619mg/dL to 1.800±0.881mg/dL(p=0.05), proteinuria did not change (101% of initial amount), and 7 of 30 patients(23.3%) developed hyperkalemia. Conclusion: Combination therapy seems to have no additive antiproteinuric effect, but serum creatinine and potassium levels should be closely monitered during the combination therapy.
김형규,박은형,조국환,Kim, Hyeong-Gyu,Park, Eun-Hyung,Cho, Kook-Hwan 한국터널지하공간학회 2018 한국터널지하공간학회논문집 Vol.20 No.3
도심지 지하공간의 개발과 운행선 하부를 저토피로 입체 교차화하는 시설 증가에 따라 비개착식 공법의 수요는 점차 증가추세에 있으나 대다수의 공법은 중대구경 강관을 압입하여 루프를 형성하고 내부를 굴착하는 파이프루프(Pipe roof) 계열의 공법이 주로 적용되고 있다. 강관 압입 시 발생되는 이완영역 및 하중은 여러 인자의 영향을 받게 되나 가장 큰 요소는 압입하는 강관의 크기에 좌우되며 이는 강관 루프 내 지중구조물에 작용하는 하중의 크기로 볼 수 있다. 지반의 교란 및 이완하중 발생을 최소화시키기 위해 개발된 SEM공법(Super Equilibrium Method)은 기존의 중대구경 강관 대신 ${\Phi}114mm$ 내외의 소구경 강관을 사용한다. 이 소구경 강관을 SEM파일로 명명하였으며 강관의 선 압입 및 그라우팅 보강을 실시한 후 지반의 침하나 융기 없이 지반 내 횡단구조물을 유압잭을 이용하여 압입하게 된다. 이와 같이 SEM공법의 구성 중 지보역할을 하는 SEM파일은 선단부 굴착 시 지반의 붕락을 방지하고 상재하중을 지지하기 위한 길이 5 m 내외의 Fore poling 파일이며 이 파일의 배치간격, 시공연장, 부재의 강성 등을 산정하기 위해서는 이완영역의 적절한 산정이 필수적이다. 본 논문은 SEM공법의 최적설계를 위하여 SEM파일 압입 시 발생되는 이완하중 산정 값을 비교분석하였다. 이완영역 산정에 근거한 주요 이론식 및 경험식들의 영향인자를 고려하여 분석하고 FEM analysis (유한요소 해석)를 수행하여 SEM파일에 적합한 이완하중 산정을 검토하였다. 또한 실제 SEM파일 압입 및 굴착 시 발생되는 지반이완을 확인하기 위해 강관압입 축소모형실험을 수행하였으며 토피고/강관(H/D)에 따른 지표침하 및 지반이완을 정량적으로 검토하였다. With the increased development in downtown underground space facilities that vertically cross under a railway at a shallow depth, the demand for non-open cut method is increasing. However, most construction sites still adopt the pipe roof method, where medium and large diameter steel pipes are pressed in to form a roof, enabling excavation of the inside space. Among the many factors that influence the loosening region and loads that occur while pressing in steel pipes, the size of the pipe has the largest impact, and this factor may correspond to the magnitude of load applied to the underground structure inside the steel pipe roof. The super equilibrium method (SEM) has been developed to minimize ground disturbance and loosening load, and uses small diameter pipes of approximately 114 mm instead of conventional medium and large diameter pipes. This small diameter steel pipe is called an SEM pile. After SEM piles are pressed in and the grouting reinforcement is constructed, a crossing structure is pressed in by using a hydraulic jack without ground subsidence or heaving. The SEM pile, which plays the role of timbering, is a fore-poling pile of approximately 5 m length that prevents ground collapse and supports surface load during excavation of toe part. The loosening region should be adequately calculated to estimate the spacing and construction length of the piles and stiffness of members. In this paper, we conducted a comparative analysis of calculations of loosening load that occurs during the press-in of SEM pile to obtain an optimal design of SEM. We analyzed the influence of factors in main theoretical and empirical formulas applied for calculating loosening regions, and carried out FEM analysis to see an appropriate loosening load to the SEM pile. In order to estimate the soil loosening caused by actual SEM-pile indentation and excavation, a steel pipe indentation reduction model test was conducted. Soil subsidence and soil loosening were investigated quantitatively according to soil/steel pipe (H/D).
직각 쐐기와 응착접촉 하는 반무한 평판 내 전위: 제1부 - 보정 함수 유도
김형규 한국트라이볼로지학회 2022 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.38 No.3
This paper is concerned with an analysis of a surface edge crack emanated from a sharp contact edge. For a geometrical model, a square wedge is in contact with a half plane whose materials are identical, and a surface perpendicular crack initiated from the contact edge exists in the half plane. To analyze this crack problem, it is necessary to evaluate the stress field on the crack line which are induced by the contact tractions and pseudo-dislocations that simulate the crack, using the Bueckner principle. In this Part I, the stress filed in the half plane due to the contact is re-summarized using an asymptotic analysis method, which has been published before by the author. Further focus is given to the stress field in the half plane due to a pseudo-edge dislocation, which will provide a stress solution due to a crack (i.e. a continuous distribution of edge dislocations) later, using the Burgers vector. Essential result of the present work is the corrective functions which modify the stress field of an infinite domain to apply for the present one which has free surfaces, and thus the infiniteness is no longer preserved. Numerical methods and coordinate normalization are used, which was developed for an edge crack problem, using the Gauss-Jacobi integration formula. The convergence of the corrective functions are investigated here. Features of the corrective functions and their application to a crack problem will be given in Part II.