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최정훈,김미경,유기환,홍영숙,이주원,김순겸,Choi Jeong Hoon,Kim Mi Kyung,Yoo Kee Hwan,Hong Young Sook,Lee Joo Won,Kim Soon Kyum 대한소아신장학회 2000 Childhood kidney diseases Vol.4 No.1
목 적 : 출생 후 며칠간의 신생아의 creatinine수치는 모체의 영향을 받으므로 소변의 creatinine을 상수로 용질 배설 측정을 하는 것은 의미가 없을 수도 있다는 보고가 있어, 저자들은 신생아에서 일정한 간격으로 측정된 소변 creatinine이 차이가 있는가에 대하여 연구를 시행하게 되었다. 방 법 : 1998년 7월부터 8월까지 출생한 건강한 신생아를 대상으로 하여 두 번의 소변을 측정하였으며, 대조군으로는 그 기간 동안 입원한 소아과 병동의 환아를 대상으로 하였다. 신생아군은 49명이고 대조군은 33명이었으며, 신생아군의 첫 소변은 출생 첫날 시행하였고 비교군의 첫 소변시 나이는 $5.7{\pm}4.3$세였다. 신생아군과 대조군에서 처음과 두 번째 소변간의 간격은 2-3일이었다. 통계분석은 sigmastat 2.0을 사용하여 단순 선형 회귀 분석, t-test, paired t-test를 이용하였다. 결 과 : Creatinine mg/dL(Mean${\pm}$SD)은 첫 소변, 두 번째 소변에서 각각 신생아군은 $32.5{\pm}29,\;29.2{\pm}23$이고 대조군은 $57.7{\pm}51,\;58.8{\pm}51$으로 두 군 모두 첫 소변과 두 번째 소변의 소변 creatinine치는 차이가 없으며, 두 군간의 평균치의 비교분석은 유의한 차이를 보였다(P<0.01). 첫 소변과 두 번째 소변간의 creatinine평균치의 상관성에서 신생아군은 r=0.504(P<0.001)이고 대조군은 r=0.631(P<0.001)이었으며, creatinine/osmolality로 보정 후에도 각각 상관계수 0.506(P<0.001), 0.386(P<0.001)으로 유의한 상관관계를 보였다. 결 론 :신생아의 첫 소변과 두 번째 소변에서 creatinine의 비교분석에서는 유의한 차이가 없었으며 따라서 신생아에서도 용질배설 측정시 creatinine을 기준치로 사용할 수 있을 것으로 사료된다. Purpose: To evaluate whether the urinary creatinine concentration is a reliable reference value to standardize urinary solute excretion in a spot urine sample during the first week of life. Methods: Spontaneously voided urine specimens were obtained in 49 healthy full term neonates, and in 33 healthy older children with the median ages of $5.7{\pm}4.3$ years, two urine samples were available with an interval of 2 to 3 days. Urine creatinine concentration was determined by the Jaffe test(CoBAS, Integra, Roche, Swiss). Uurine osmolality was determined by the freezing point depression test(Multi-osmette, Precision, USA). Results: Mean urinary creatinine and osmolality values of the first urine samples were not significantly different with the second urine samples in each group. Mean urinary creatinine and osmolality values in neonates were significantly different from the older children of the each urine sample(P<0.01). In neonates, the mean of the urinary oreatinine/osmolality ratios was higher than that of the older children(P<0.01). The urinary creatinine and the creatinine/osmolality values of the first urine samples were closely correlated with those of the second samples in both two groups(P<0.001). Conclusion: The urinary creatinine concentration during the first day of life is relatively stable, even when corrected for urinary osmolality The urinary creatinine and the urinary creatinine/osmolality ratio, therefore, can be used to standardize the urinary excretion of solutes in the neonate.
역기하렌즈 착용 후 시력, 굴절이상 그리고 각막 난시의 상관성 분석
최정훈,류정완,이영춘,김현승,Jeong Hoon Choi,Jeong Wan Ryu,M,D,Young Chun Lee,M,D,Hyun Seung Kim,M,D 대한안과학회 2006 대한안과학회지 Vol.47 No.8
Purpose: To evaluate correlations with refractive error, astigmatism and uncorrected visual acuity after Ortho-K LKTM lens wear. Methods: Sixty-one eyes of 32 patients who had been wearing reverse geometry lenses for over 5 weeks were recruited. Uncorrected visual acuity, subjective refraction on retinoscopy, objective refraction measured by an autorefractometer, and corneal astigmatism were measured by corneal topography before, at 2 days, and 1, 3, and 5 weeks after lenses fitting. Results: Uncorrected visual acuity improved from 0.12±0.10 to 0.95±0.15 after 5 weeks. Subjective refraction on retinoscopy and objective refraction measures with the autorefractometer were -3.52±1.65D and -4.06±1.73D, respectively before wearing the lenses. These decreased to -0.08±0.40D and -1.98±2.04D, respectively after 5 weeks. The astigmatism detected by corneal topography improved from 0.93±0.49 to 1.20±1.03 after 5 weeks. Uncorrected visual acuity was correlated with the refractive error measured by subjective refraction with retinoscopy rather than that by objective refraction with the autorefractometer. Corneal astigmatism measured by corneal topography correlated with the refraction detected by the autorefractometer. Conclusions: Subjective refraction by retinoscopy rather than refraction found objectively using the autorefractometer, was highly correlated with uncorrected visual acuity (r=0.77~0.87) which seems to be useful in evaluating myopia patients. The astigmatism determined by autorefractometer examination had high correlation with that determined by corneal topography (r=0.51~0.76). This result appears useful in decisions related to the decentering of lenses.
최정훈(Choi Jeong Hoon),서영국(Seo Youngguk),서영찬(Suh Young Chan) 대한토목학회 2009 대한토목학회논문집 D Vol.29 No.4D
본 연구는 포장가속시험을 이용하여 다양한 온도와 하중재하방법에 따라 아스팔트 포장에 발생하는 소성변형의 특성을 분석하고, 주요 시험결과를 유한요소해석으로 예측하는 방법을 제시하고 있다. 가속시험용 포장단면은 한국도로공사 시험도로 대표 단면 중에 하나를 선정하여 동일하게 시공하고 3가지 온도조건(30, 40, 50℃)에서 반복이동하중에 의한 소성변형을 비교분석하였다. 차량의 원더링 효과를 모사하기 위하여 가속시험기를 횡방향으로 좌우 35㎝ 범위 내에서 5㎝ 간격으로 이동하면서 시험을 수행하였다. 아울러 3가지 원더링 조건에 의한 소성변형의 차이도 수치해석을 통해서 검토하였다. 유한요소해석을 위하여 ABAQUS를 사용하였으며 가속시험 포장 단면을 plain strain 요소로 모델링하였다. 포장 층의 탄성계수는 FWD 시험에 의한 역산결과로 추정하였으며, 소성변형에 영향을 미치는 아스팔트 혼합물의 시간 의존성은 크리프 모델(creep model)로 고려하였다. 그리고 본 연구에서는 유한요소해석에 미치는 모델의 경계조건과 노상의 모델 포함 여부에 따른 영향을 두 가지 모델(전체모델과 부분모델)로 구분하여 검토하였다. 해석결과 두 가지 모델이 예측한 소성변형은 그 크기와 영향범위에서 확연한 차이를 보였으며 계측결과와 비교하여 보면 노상이 모델에 포함하여야 할 것으로 판단되었다. This paper presents the results of accelerated pavement tests (APT) that simulate permanent deformation (rutting) of asphalt concrete pavements under different temperatures and loading courses. Also, finite element (FE) analysis has been conducted to predict the test results. Test section for APT is the same as one of test sections at Korea Expressway Corporation test road and is subjected to a constant moving dual tire wheel load of APT at three different temperatures: 30, 40, 50℃. The moving wheel is applied at different loading courses within a 75㎝ wide wheel path to account for traffic wandering. Also, the effect of wandering on permanent deformation development is investigated numerically with three wandering schemes. In this study, ABAQUS is adopted to model APT pavement section with plain stain elements and creep strain rate model is used to take into account viscoplastic stain of asphalt concrete mixtures, and elastic layer properties are back-calculated from FWD measurements. Plus, the effect of boundary condition and subgrade on FE permanent deformation predictions is investigated. A full FE model that accounted for subgrade provided more realistic rut depth predictions, indicating subgrade has contributed to surface rutting.
최정훈 ( Jeong Hoon Choi ),김창현 ( Chang Hyun Kim ),문재곤 ( Jae Gon Moon ),이호국 ( Ho Kook Lee ),이민진 ( Min Jin Lee ),최종훈 ( Jong Hun Choi ) 대한뇌종양학회 2007 대한뇌종양학회지 Vol.6 No.1
Objective:The extent of peritumoral brain edema(PTBE) in meningioma is very variable and PTBE can adversely affect the clinical course. Many influenceable factors have been investigated, but the mechanism of that is not fully understood. Recent reports have focused on the arterial blood supply pattern and immunohistopathological aspect. The authors investigated several clinical and immunohistopathological factors that may influence the development of PTBE and postoperative edema patterns in meningioma. Methods:We studied 30 cases of intracranial meningioma which were histologically proven. We focused on identifying the interaction of the location, the tumor and edema volume, the histological subtype, the preoperative edema index(EI), the biological activity indicated by the VEGF and the MIB-1 labeling index(LI), the postoperative EI. Results:There was no statistically significant correlation between the location and the PTBE. There was statistically significant correlation between the histology and the PTBE. But there was no significant correlation between the histology and the decrease in postoperative remaining PTBE. The MIB-1 LI was positively related to the PTBE formation in meningiomas. Also MIB-1 LI was related to the decrease in postoperative remaining PTBE. The VEGF was positively correlated with the PTBE formation in meningiomas but there was no statistically correlation with the decrease in postoperative remaining PTBE. Conclusion:The greater MIB-1 LI results in greater PTBE formation and more decreased in postoperative PTBE. The greater VEGF expression results in greater PTBE formation.