혈관 내 폐보조장치에서의 압력손실 예측

박재관,김성종,이삼철,정경락 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-

The purpose of this study was making a equation to predict relationship between pressure drop and frontal area in 40% glycerol solution at 37 ℃. Before using whole blood, we estimated pressure drop with experimental equation, and compared the results with experimental results. Also, we tried to make module design that contained the maximum number of hollow fiber membranes in 3㎝diameter tube. We have observed pressure drop of 40% glycerol solution flow rate in each modules that have been changed by the number of the hollow fibers, and studied about the equation related between flow rate and pressure drop, friction factor and Reynolds number. The results showed that the pressure drop which was calculated with the various frontal area was similar to the pressure drop of using the equation obtained from the experimental. Also, the maximum number of hollow fiber is 675, which can be inserted in 3㎝diameter tube when the out side of diameter was 380㎛. It satisfied pressure drop(<15㎜Hg).

Broadband antireflective glasses with subwavelength structures using randomly distributed Ag nanoparticles.

Park, Gyeong Cheol,Song, Young Min,Ha, Jong-Hoon,Lee, Yong Tak American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.7

<P>We demonstrate broadband antireflective glasses with subwavelength structures (SWSs) using randomly distributed Ag nanoparticles. Ag nanoparticles formed by a thermal dewetting process were used as an etch mask for dry etching to fabricate antireflective SWSs on the glass surface. The size and shape of Ag nanoparticles are changed by the different thickness of the Ag thin film. The morphology of SWSs fabricated by using the Ag thin films is well consistent with that of the Ag nanoparticles. The single-side SWS integrated glass exhibits improved transmittance of similar to 96% at 750 nm due to the graded refractive index profiles, while the transmittance is only similar to 92.5% for the flat surface. To reduce Fresnel reflection at the other side of the glass substrate, the SWSs with optimized Ag film thickness and dry etching conditions are formed on both sides of the glass. The dual-side SWS integrated glass show an average transmittance of similar to 97.5% in a wavelength range of 350-750 nm. Transmission band shrinkage effects of the SWS integrated glass are also observed with increased average size of the Ag nanoparticles.</P>

Size-dependent optical behavior of disordered nanostructures on glass substrates

Park, Gyeong Cheol,Song, Young Min,Kang, Eun Kyu,Lee, Yong Tak The Optical Society 2012 Applied optics Vol.51 No.24

A high-density array of size-controlled silicon nanodots in a silicon oxide nanowire by electron-stimulated oxygen expulsion.

Park, Gyeong-Su,Lee, Eun Kyung,Lee, Jun Ho,Park, Juyeon,Kim, Seong Keun,Li, Xiang Shu,Park, Ju Cheol,Chung, Jae Gwan,Jeon, Woo Sung,Heo, Sung,Lee, Jae Hak,Choi, Byoung Lyong,Kim, Jong Min American Chemical Society 2009 NANO LETTERS Vol.9 No.5

<P>Methods of producing Si nanodots embedded in films of silicon oxide and silicon nitride abound, but fabrication of Si nanodots in a nanowire of these materials is very rare despite the fact that nanowire architecture enhances the charge collection and transport efficiencies for solar cells and field-effect transistors. We report a novel fabrication method for a high-density array of size-controlled sillicon nanodots from a silicon oxide nanowire using electron-beam irradiation. Our results demonstrate that a highly dense phase of Si nanodots with a narrow size distribution can be made from a silicon oxide nanowire with a core-shell structure of crystalline silicon-rich oxide (c-SRO)/amorphous silicon oxide (a-SiO(2)). This new nanomaterial shows the carrier transport characteristics of a semiconductor. The initially produced amorphous Si nanodots can be readily turned into crystalline Si (c-Si) nanodots by thermal annealing. Key characteristics of c-Si nanodots such as their size, number density, and rate of nucleation and growth are easily controlled by varying the electron radiation dose and annealing temperature. Nanodot formation is mechanistically initiated by electron trapping at the c-SRO core as well as at the core-shell interface, which leads to out-diffusion of the negatively charged oxygen through Coulomb repulsion, fostering the aggregation of Si atoms.</P>

Poster Presentation : Hepatic Lipase 514T Allele is Associated with Higher Plasma HDL-C Levels in Koreans without Coronary Artery Disease

박경우 ( Park Gyeong U ),김효수 ( Kim Hyo Su ),오세일 ( O Se Il ),채인호 ( Chae In Ho ),김철호 ( Kim Cheol Ho ),손대원 ( Son Dae Won ),오병희 ( O Byeong Hui ),이명묵 ( Lee Myeong Mug ),최윤식 ( Choe Yun Sig ),박영배 ( Park Yeong B 한국지질동맥경화학회 ( 구 한국지질학회 ) 2002 韓國脂質學會誌 Vol.12 No.1

Objectives : Hepatic lipase is a key enzyme involved in HDL-C metabolism. The aim of this study was to find out the frequency of the hepatic lipase C514T polymorphism in Koreans, and its relationship with plasma HDL-C levels and the development of coronar

고령자의 맥상 특성에 대한 맥파분석적인 연구

Kim, Gyeong-Cheol,Lee, Jeong-Won,Ryu, Gyeong-Ho,Gang, Hui-Jeong,Cho, Sang-Won,Park, Young-Jae,Kim, Min-Yong,Oh, Hwan-Sup,Park, Young-Bae 대한한의진단학회 2008 大韓韓醫診斷學會誌 Vol.12 No.2

Objectives: The basis research of aged people's healthcare technology is very important, because our nation goes into an aged society rapidly. Especially in traditional medicine, pulse shapes of aged people were supposed to weak and empty pulse until now, but any objective measurement and compare research do not taken. Methods and Results: Therefore in this study we design observation study to find characteristic of pulse between younger group (age $20{\sim}30$) and elder group (age $43{\sim}80$) in Busan area. We used 3-dimensional pulse analyzer '3-D MAC' (Daeyomedi Co., Ltd.). And major parameters for comparison are 1) pulse height (h1), 2) applied pressure, 3) pulse power (energy), 4) high pressure duration (w) and 5) R-AI. Conclusions: According to analysis result, elder people's pulse has more large value in pulse height, applied pressure and pulse power than younger's that. It reveals that elder people in modernized lifestyle has Yang symptoms as well Yin symptoms. Consequently we need new method to care elder people's health, and this means more important direction than old text book. From now on verification research with objective diagnosis device like 3-D MAC, must be activated to build of evidence in traditional medicine. Cause traditional medicine's spirit of care and prevention is suitable to care elder people's cardiac and cerebral vascular disease those are have close relation with elder people.

고등학생의 2015 개정 교육과정 기반 6대 핵심역량 잠재계층 분류 및 영향 요인

박경하(Gyeong-ha Park), 김재철(Jae-cheol Kim) 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.9

목적 본 연구는 고등학생의 자기관리 역량, 지식정보 처리 역량, 창의적 사고 역량, 심미적 역량, 공동체 역량, 의사소통 역량에 따라 잠재계층을 분류하여 잠재계층에 영향을 주는 요인들을 분석하고자 하였다. 방법 연구 자료는 부산광역시교육청 교육정책연구원 주관으로 설문을 통해 수집한 부산교육 종단연구(Busan Education Longitudinal Study: BELS)의 설문 중 제4차 년도와 5차 년도에 해당하는 2019 ~ 2020년의 고등학교 1학년과 2학년에 해당하는 표집 자료를 사용하였고 1차 년도 설문에는 남학생 1,603명, 여학생 1415명으로 총 3,046명이 설문에 참여하였다. 잠재계층 분류를 위해 잠재프로파일 분석을, 계층별 영향 요인 분석을 위해 다항 로지스틱 회귀분석을 실시하였다. 결과 첫째, 잠재 계층 사례 수를 종합적으로 고려해볼 때 5개의 계층 분류 모형이 가장 적합한 모형으로 판단하였다. 둘째, 성별은 계층 분류에 대부분 유의미한 영향을 주지 못하였으나 ‘전반적 고역량집단’, ‘공동체 역량 불균형집단’보다 ‘중하위 역량집단’에 포함될 가능성이 높았다. 셋째, 학습활동 시간이 높을수록 ‘전반적 저역량집단’보다 ‘중상위 역량집단’, ‘전반적 고역량집단’, ‘공동체 역량 불균형집단’에 포함될 가능성이 높았으며, 부모⋅자녀관계가 좋을수록 ‘공동체 역량 불균형집단’보다 ‘중하위 역량집단’에 포함될 가능성이 높았고, 교사 관계가 좋을수록 ‘전반적 저역량집단’보다 ‘전반적 고역량집단’에 포함될 가능성이 높았으며, 교우 관계가 좋을수록 ‘중상위 역량집단’ 보다는 ‘전반적 고역량집단’에 포함될 가능성이 높음을 확인하였다. 결론 핵심역량 발달을 수준에 따라 잠재계층 분류에 영향을 주는 변수(학습활동 시간, 부모, 교사, 교우관계)의 적절한 한 개입이 필요하다. 자녀를 지지하고 보호하는 기능을 상실한 결손 가정을 돕기 위해 사회와 기관이 적극적 지원환경을 구축하고 학생이 학습활동 시간을 확보할 수 있도록 돕기 위해 학교에서 다양한 활동(학생자치, 방과후 활동 등) 지원해야 한다. 지나칠 정도로 교우관계에 집착하려는 경향을 보이는 학생들에게 역량 발달에 부정적인 영향을 미칠 수 있다는 점을 감안하여 건강한 교우관계에 대한 올바른 교육이 필요함을 시사한다. Objectives This study tried to analyze the factors affecting the potential class by classifying the potential class according to high school students' self-management ability, knowledge information processing ability, creative thinking ability, aesthetic ability, community ability, and communication ability. Methods Research data were high school samples from 2020 to 2021, corresponding to the 4th and 5th years, among the surveys of the Busan Education Longitudinal Study (BELS) collected through questionnaires supervised by the Education Policy Research Institute of the Busan Metropolitan Office of Education. A total of 3,046 people (1,603 male students and 1,415 female students) participated in the survey. Latent profile analysis was performed to classify the latent class, and multinomial logistic regression analysis was performed to analyze the influencing factors for each class. Results First, when comprehensively considering the number of latent class cases, the 5 class classification model was judged to be the most appropriate model. Second, gender did not have a significant effect on class classification in most cases, but it was more likely to be included in the ‘middle and lower competency group’ than the ‘overall high competency group’ and ‘community competency imbalanced group’. Third, the higher the learning activity time, the higher the possibility of being included in the ‘higher middle competency group’, ‘overall high competency group’, and ‘unbalanced community competency group’ than the ‘overall low competency group’. The possibility of being included in the ‘lower-middle competency group’ was higher than the ‘community imbalanced competency group’. The better the teacher relationship, the higher the possibility of being included in the ‘overall high competency group’ than the ‘overall low competency group’. It was confirmed that they were more likely to be included in the ‘overall high competency group’ rather than the upper middle competency group. Conclusions intervention of variables (learning activity time, parents, teachers, peer relationships) that affect the classification of latent classes according to the level of core competency development is required. In order to help broken families who have lost the ability to support and protect their children, society and institutions must establish an active support environment and support various activities (student autonomy, after-school activities, etc.) at school to help students secure time for learning activities. do. Considering that students who tend to be excessively obsessed with peer relationships can have a negative impact on their competency development, it suggests that proper education on healthy peer relationships is necessary.

산모 혈중 혈소판 최저치를 기준으로 한 HELLP 증후군 분류에 따른 산모-신생아 합병증의 비교

박만철 ( Park Man Cheol ),이승훈 ( Lee Seung Hun ),임준영 ( Im Jun Yeong ),김현준 ( Kim Hyeon Jun ),권경순 ( Kwon Gyeong Sun ),박충학 ( Park Chung Hag ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.3

목적 : 전체 분만 및 자간증-전자간증에 대한 HELLP 증후군의 빈도를 알아보고, HELLP 증후군을 산모 혈액 내 혈소판 최소치 50,000/㎣을 기준으로 class Ⅰ과 class Ⅱ로 분류하여 산모 및 신생아의 임상적 특징, 검사실 소견 및 합병증 등을 서로 비교 분석하였다. 연구 방법 : 1995년 1월부터 2002년 12월까지 단국대학교병원 산부인과에서 분만하였던 총 10,238예 중에서 중증 전자간증-자간증은 443예 이었으며, HELLP 증후군에 해당하는 경우 10예를 대상으로 하였다. 산모 혈액 내 혈소판의 최저 수치에 따라 50,000/㎣ 미만인 경우는 class Ⅰ, 50,000/㎣에서 100,000/㎣ 미만인 경우는 class Ⅱ로 분류하였다. 산모의 임상적 특성 및 검사실 소견, 그리고 신생아의 임상적 소견들을 class Ⅰ과 class Ⅱ에 따라 각각 비교 분석하여 class Ⅰ과 class Ⅱ간에 중증도의 차이를 알아보았다. 그러나 대상 환자수가 적어 통계학적 처리는 하지 않았다. 결과 : class Ⅰ HELLP 증후군 환자는 4명, class Ⅱ는 6명으로 전체 분만에 대한 발생 빈도는 0.10%, 자간증 및 중증 전자간증에 대한 발생 빈도는 2.26%이었다. 혈중 혈소판 최저치의 평균은 class Ⅰ에서 41,500/㎣, class Ⅱ에서 64,000/㎣이었으며, 혈소판 치가 100,000/㎣이상으로 회복되는데 걸렸던 기간은 class Ⅰ이 평균 6.0일, class Ⅱ가 평균 4.2일이었다. class에 따른 AST, ALT 및 요산의 농도 차이는 크지 않았다. 그러나 LDH 농도는 class Ⅰ에서 5855 IU/L, class Ⅱ에서 1388 IU/L로 전 환자에 걸쳐서 현격한 차이를 나타냈다. class Ⅰ HELLP 증후군 산모 4명 모두에서 합병증이 생겼으나 class Ⅱ에서는 한 명만 합병증이 생겼다. 두 class간에 임신 주수 및 신생아 체중에 차이는 없었으며, 신생아 합병증에도 차이가 없었다. 결론 : HELLP 증후군 산모의 혈중 혈소판 수치가 산모의 예후를 예측하는데 많은 도움을 줄 수 있을 것으로 생각되며, 신생아의 이환율과 사망률은 산모의 혈중 혈소판 수치와 관계없이 임신 주수와 관계가 있을 것으로 여겨진다. Objective : To determine the incidence of HELLP (hemolysis, elevated liver enzymes and low platelet count) syndrome and assess the relationship between the maternal-fetal complications and the severity of HELLP syndrome, classified based on platelet count nadir. Methods : We reviewed the maternal and neonatal charts of ten pregnancies complicated by HELLP syndrome, managed at Dankook University Hospital between January, 1995 and December, 2002. Women were divided into 2 groups as class Ⅰ HELLP which had a mate구미 platelet nadir ≤50,000/㎣, and class Ⅱ HELLP which had a maternal platelet nadir between >50,000 and 100,000/㎣. We compared the maternal and fetal complications between class Ⅰ and class Ⅱ HELLP syndrome. But we did not analyze statistically due to small number of patients. Results : There were four cases of class Ⅰ HELLP and six cases of class Ⅱ HELLP syndrome. The incidence of HELLP syndrome was 0.10% (10/10,238) in total deliveries and was 2.26% (10/443) in women with severe pre-eclampsia or eclampsia. The mean level of platelet counts nadir was 41,500/㎣ in class Ⅰ and 64,000/㎣ in class Ⅱ HELLP. The mean platelet recovery days (more than 100,000/㎣) were 6.0 and 4.2 days in each class. The mean values of the maximal aspartate aminotransferase (AST/SGOT), alanine aminotransferase (ALT/SGPT) and uric acid might show no differences, but there might be difference in lactate dehydrogenase (LDH) levels which were 5854 and 1388 IU/L in each class. All patients with class Ⅰ HELLP syndrome showed maternal complications, but only one patient with class Ⅱ HELLP showed maternal complications. There might be no differences in the mean gestational ages and birth weights. The neonatal complications were similar in each class. Conclusion : Our data suggest that patients with class Ⅰ HELLP syndrome may be at increased risk for serious maternal complication, but the neonatal complications may be associated with gestational ages.

토론문 : "국사교과서에 나타난 광개토대왕의 해양활동 관련 서술의 문제점과 제언"에 대한 약정토론문

박경철 ( Park Gyeong Cheol ) 고려사학회 2003 고려사학회 학술대회 Vol.- No.-

심포지움,특별강연 및 일반연제 발표 : 급성 신부전에서 신생검의 임상적 유용성

박경대 ( Park Gyeong Dae ),강미정 ( Kang Mi Jeong ),황은아 ( Hwang Eun A ),이기태 ( Lee Gi Tae ),박성배 ( Park Seong Bae ),김현철 ( Kim Hyeon Cheol ) 대한신장학회 2000 춘계학술대회 초록집 Vol.19 No.2