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하나로에서의 NTD 조사를 위한 중성자속 평탄화 장치의 최적화를 위한 예비분석
송영동,이헌주,이병택,전병진,김학노 濟州大學校 産業技術硏究所 2001 산업기술연구소논문집 Vol.12 No.1
NTD (Pieutron Transmutation Doping) method has several advantages of high resistivity and uniform doping in comparison with other method. To satisfy those conditions. the flux variations of radial and axial directions should be within ±5 % and ±1.7%. respectively. The NTD facility in HANARO is purposed to irradiate the silicon ingot of 60cm in height. Hence. the flux flattener will be designed for 60cm. In this paper. preliminary study for optimal design is showed and the flux distribution of axial direction is calculated using MCNP4B code. The results show that the flattener model can flatten the flux to 83% of total length.
하나로에서의 NTD조사를 위한 중성자속 평탄화 장치의 최적화를 위한 예비분석
송영동,이헌주,이병철,전병진,김학노 제주대학교 산업기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.1
NTD(Neutron Transmutation Doping) method has several advantages of high resistivity and uniform doping in comparison with other method. To satisfy those conditions, the flux variations of radial and axial directions should be within ±5% and ±1.7%. respectively. The NTD facility in HANARO is purposed to irradiate the silicon ingot of 60cm in height. Hence, the flux flattener will be designed for 60cm. In this paper, preliminary study for optimal design is showed and the flux distribution of axial direction is calculated using MCNP4B code. The results show that the flattener model can flatten the flux to 83% of total length.
REMARKS ON THE PAPER: ORTHOGONALLY ADDITIVE AND ORTHOGONALLY QUADRATIC FUNCTIONAL EQUATION
Kim, Hark-Mahn,Jun, Kil-Woung,Kim, Ahyoung Chungcheong Mathematical Society 2013 충청수학회지 Vol.26 No.2
The main goal of this paper is to present the additional stability results of the following orthogonally additive and orthogonally quadratic functional equation $$f(\frac{x}{2}+y)+f(\frac{x}{2}-y)+f(\frac{x}{2}+z)+f(\frac{x}{2}-z)=\frac{3}{2}f(x)-\frac{1}{2}f(-x)+f(y)+f(-y)+f(z)+f(-z)$$ for all $x,y,z$ with $x{\bot}y$, which has been introduced in the paper [11], in orthogonality Banach spaces and in non-Archimedean orthogonality Banach spaces.
Sentinel Node Biopsy with Double Tracers of Dye and Isotope in Early Gastric Cancer
Jun Ho Lee,Keun Won Ryu,Sang Gyun Kim,Chan Gyoo Kim,Seok-Ki Kim,Il Ju Choi,Young Woo Kim,Myeong-Cherl Kook,Hee Jin Chang,Ji Yoon Rho,Sook Ryeon Park,Hark Kyun Kim,Jae-Moon Bae,Eun Kyoung Hong 대한외과학회 2005 대한외과학회 학술대회 초록집 Vol.2005 No.10
Hark-Mahn Kim,Kil-Woung Jun,Ahyoung Kim 충청수학회 2013 충청수학회지 Vol.26 No.2
The main goal of this paper is to present the addi-tional stability results of the following orthogonally additive and orthogonally quadratic functional equation f(x2+ y) + f(x2¡ y) + f(x2+ z) + f(x2¡ z)=32 f(x) ¡12 f(¡x) + f(y) + f(¡y) + f(z) + f(¡z); for all x; y; z with x ? y, which has been introduced in the pa- per [11], in orthogonality Banach spaces and in non-Archimedean orthogonality Banach spaces.
2차 및 3차 위상 항을 가지는 정현파 음성-오디오 모델의 빠른 하모닉 합성 방법
김종학(Jong-Hark Kim),김규진(Kyu-Jin Kim),정규혁(Gyu-Hyoek Jung),김영준(Young-Jun Kim),이인성(In-Sung Lee) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
In this paper, we propose a harmonic synthesis method that consumes a small complexity in sinusoidal audio models using a quadratic and a cubic phase. The quadratic phase ret can be separated into a over-sampling function and a inverse Fourier transform(IFFT) function. By applying the boundary condition of frequency and phase between frames, we at first derive the harmonic synthesis function with the quadratic phase. The harmonic synthesis ret is composed of the IFFT function and the overlap-add function with a reduced complexity. Also, we at second derive the fast harmonic synthesis function with cubic phase term; the 3<SUP>rd</SUP> parameter of the cubic phase term is constrained to be independent apart from harmonic index. Experimental results show that the proposed method significantly reduce the complexity of conventional cosine synthesis method while maintaining the performance.
( Beom Su Kim ),( Hark Mo Sung ),( Hyung Keun You ),( Su Jin Kim ),( In Seop Kim ),( Jun Lee ) 한국조직공학·재생의학회 2011 조직공학과 재생의학 Vol.8 No.2
Mesenchymal stem cells (MSCs) and scaffolds may overcome the limitations of traditional bone grafts. We investigated growth and osteoblast differentiation of human alveolar bone marrow-derived MSCs (hABMMSCs) in fibrin gel (FG) 3-dimensional (3D) culture. We compared hABMMSCs with human iliac crestderived MSCs (hICMSCs) and alginate gel (AG) was compared with FG. Morphological, histological, cell proliferation and viability characteristics of 3D cultured hABMMSCs were defined and compared with hICMSCs and AG. Gel-embedded cells were cultured in medium containing osteogenic differentiation stimulant (OS) and differentiation was assessed by alkaline phosphate (ALP) activity and mRNA expression of osteoblast marker genes. Isolated hABMMSCs and hICMSCs exhibited fibroblast-like morphology and expressed CD44, CD73, CD, 90, CD105, and CD106, but not CD34. hABMMSC proliferation in 3D FG culture was about 3-fold greater than that in 3D AG culture. hABMMSCs and hICMSCs exhibited a rounded morphology in AG, and fibroblastic morphology in FG. OS treatment increased ALP activity in both hABMMSCs and hICMSCs cultured in FG but yielded no significant changes in AG. Activity reached a maximum on culture day 10, and decreased on day 15. Following OS treatment, mRNA expression of ALP and osteopontin (OPN) increased in hABMMSCs and hICMSCs in FG by 3-fold over that in AG. mRNA expression of collagen type Iα1 (ColIα1) and osterix (OSX) were also 2-fold and 6-fold greater in FG than in AG.
저나트륨혈증 환자의 진단과 치료에서 연속적인 생리식염수 및 수분 부하검사와 Barsoum-Levine 공식의 유용성
이주학 ( Joo Hark Yi ),김원준 ( Won Jun Kim ),노유석 ( U Seok Noh ),김연재 ( Yeon Jae Kim ),고영선 ( Young Sun Ko ),한상웅 ( Sang Woong Han ),김호중 ( Ho Jung Kim ) 대한신장학회 2008 Kidney Research and Clinical Practice Vol.27 No.6
In hyponatremic patients, the assessment of extracellular fluid volume plays an essential step in diagnosing the etiology of hyponatremia and deciding how to manage it. Although various laboratory tests and diagnostic procedures have been developed for differential diagnosis of hyponatremia, there still are limits to the evaluation of the status of extracellular fluid volume due to the data that overlaps each other, leading to the difficulty in diagnosing between euvolemia and hypovolemia. Also, there is no consensus about how to guide the type and amount of fluid therapy despite many formulas including Adrogue-Madias and Barsoum-Levine formulas have been suggested. Hereby, we are reporting two hyponatremic patients (102 and 105 mEq/L) admitted simultaneously with indistinct volume status on initial clinical and laboratory examinations, but were clarified as euvolemic hyponatremia (syndrome of inappropriate antidiuretic hormone secretion) in one and hypovolemic hyponatremia in the other case after sequential intravenous saline (2 L over 24 hrs) and oral water (20 mL/kg) loading tests. When serum sodium values calculated by the above-mentioned two formulas were compared with actually measured ones during saline loading test in these cases, the Barsoum-Levine formula revealed almost no discrepancy between both the values while the Adrogue-Madias formula underestimated the measured value.
한국형 이동식 심폐소생기 개발 보고 II. 응급소생술을 위한 이동식 심폐소생기의 동물 실험 연구
김형묵,이인성,백만종,선경,김광택,이혜원,이규백,장준근,김종원,김학제,Kim, Hyoung-Mook,Lee, In-Sung,Baek, Man-Jong,Sun, Kyung,Kim, Kwang-Taik,Lee, Hye-Won,Lee, Kyu-Back,Chang, Jun-Kuen,Kim, Chong-Won,Kim, Hark-Jei 대한흉부심장혈관외과학회 1998 Journal of Chest Surgery (J Chest Surg) Vol.31 No.12
배경:이동식 인공심폐기는 심정지 기간 동안 안정한 혈역학 상태를 유지하여 생존율을 향상시킬 수 있기 때문에 강력하고 효과적인 심폐소생법의 하나로 그의 사용이 증가하고 있다. 본 연구진은 초기모델의 한국형 이동식 심폐소생기를 이용한 심폐소생술과 기존의 개흉식 심폐소생술을 비교하여 혈역학 유지와 소생 여부 및 신체장기들에 미치는 효과를 알아보고자 하였다. 대상 및 방법: 한국산 잡견 8마리(30∼51kg)를 대상으로 개흉식 심폐소생술군과 심폐소생기를 이용한 심폐소생술군으로 각각 4마리 씩 나누었다. 4분 간의 심실세동형 심정지 기간이 지난 후 15분 간의 기본 심폐소생술(basic life support; BLS)을 실시하고 30분 간의 고급 심폐소생술(advanced life support; ALS)을 실시하여 자발순환회복, 혈역학 상태, 혈구성분에 미치는 효과, 혈액 가스 검사, 생화학 검사 및 생존율 등을 알아보았다. 심장압박과 폐환기는 두 군 모두 동일한 조건으로 유지하였으며, 고급 심폐소생술 시작과 동시에 제세동을 하고 에피네프린 및 탄산수소나트륨을 투여하여 자발순환회복을 유도하였다. 측정한 관찰값은 심정지전 관찰값으로부터의 변화율(%)로 환산하여 평균±표준편차로 표시하였다. 결과: 고급 심폐소생술 초기에 평균 체동맥압은 심폐소생기군에서 개흉식 심폐소생술군 보다 높게 유지되었고 (90±19% vs. 71±32%, p<.05), 평균 폐동맥압은 심폐소생기군이 개흉식 심폐소생술군 보다 낮게 유지되었다 (105±24% vs. 146±6%, p<.05). 자발순환회복은 모든 실험견에서 나타났다. 자발순환회복 후 심폐소생기군에서 혈중 헤마토크리트치, 적혈구와 혈소판 수가 유의하게 감소하였고 혈중 유리헤모글로빈치는 유의하게 증가하였다(p<.05). 혈액가스검사와 lactate 및 CK-MB치는 두 군간에 차이가 없었다. 실험 후 조기사망은 심폐소생기군에서 2마리, 개흉식 심폐소생술군에서 3마리에서 있었다(생존기간 228±153 vs. 31±36 시간, p=ns). 나머지는 모두 장기 생존율을 보였다. 결론: 본 연구결과 이동식 심폐소생기를 이용한 심폐소생술은 심정지 기간 동안 안정한 혈역학 상태를 유지하여 자발순환회복 및 장단기 생존율을 향상시킬 수 있다. 추후 이동식 심폐소생기 개선과 임상적용을 위해 초기모델을 수정 보완하는 실험연구가 더 필요하리라 본다. Background: Portable cardiopulmonary bypass(CPB) technique has been used increasingly as a potent and effective option for emergency cardiopulmonary resuscitation(CPR) because it can maintain more stable hemodynamics and provide better survival than conventional CPR techniques. This study was designed to develop a prototype of Korean portable CPB system and, by applying it to CPR, to discriminate whether it would be superior to standard open-chest CPR. Material and Method: By using adult mongrel dogs, open-chest CPR(OCPR group, n=4) and portable-CPB CPR(CPB group, n=4) were compared with respects to restoration of spontaneous circulation(ROSC), hemodynamics, effects on blood cells, blood gas patterns, biochemical markers, and survivals. Ventricular fibrillation-cardiac arrest(VF-CA) of arrest(VF-CA) of 4 minutes followed by basic life support(BLS) of 15 minutes was applied in either group, which was standardized by the protocol of American Heart Association. Then, advanced life support(ALS) was applied to either group under the support of internal cardiac massage or CPB. ALS was maintained until ROSC was achieved but not longer than 30 minutes regardless of the presence of ROSC. All of the measured values were expressed as means±SD percent change from baseline. Result: During the early ALS, higher mean arterial pressure was maintained in CPB group than in OCPR group(90±19 vs. 71±32 %; p<.05) and lower mean pulmonary arterial pressure was also maintained in CPB group than in OCPR group(105±24 vs. 146±6%; p<.05). ROSC was achieved in all dogs. Post-ROSC levels of hematocrit, RBC, and platelet were decreased and plasma free hemoglobin was increased significantly in CPB group compared to OCPR group(p<.05). Changes in blood gas patterns, lactate, and CK-MB levels were not different between groups. Early mortality was seen in 3 dogs in OCPR group(survival time 31±36 hours) and 2 in CPB group(228±153 hours, p=ns). The remainders in both groups showed prolonged survival. Conclusion: These findings indicate that portable CPB can be effective to maintain stable hemodynamics during cardiac arrest, to achieve ROSC and to prolong survival. Further study is needed to refine the portable CPB system and to meet clinical challenges.