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Holographic Interferometry를 이용한 탄성 고무 인상재의 체적변화에 관한 연구
하치양,이성복,우이형 慶熙大學校 齒科大學 1995 慶熙齒大論文集 Vol.17 No.1
This study investigated the time-dependent dimensional changes of elastomeric impression materials using holographic interferometry. Six commercial impression materials, Permlastic(polysulfide), Xantopren VI, (condensation silicone), low and medium viscosity of Exafine, Provil (addition silicone), and Impregum( polyether), were selected. Steel plate was used as custom tray, and each impression specimen was 20 mm in width, 15 mm in length and 3 mm in thickness. Each impression material was evaluated at 30 minutes, 1, 2 4, 6, 8 and 12 hours after setting using real-time holography. The results were as follow 1. Xantopren VL and Permlastic showed relatively severe and continuous dimensional changes after setting. Low viscosity of Exafine, Provil, Impregum showed relatively slight dimensional changes with function of time and medium viscosity of Exafine showed almost no dimensional change from 2 hours after setting to 6 hours. 2. On initial dimensional changes within 1 hour, the amount of change in low viscosity of Exafine was the least and Xantopren VL was the largest. 3. On dimensional changes at 4 hours after setting, the amount 'of change in medium viscosity of Exafine was the least and the change of Xantopren VL was the largest. 4. In overall dimensional stability during 12 hours, medium viscosity of Exafine was the most stable and Xantopren VL and Permlastic were least stable.
전재식,채하석,진응국,이철영,조혁,하정우 충남대학교 기초과학연구소 1992 연구논문집 Vol.12 No.-
고순도 Ge(HPGe) 검출장치를 사용한 현장측정을 통하여 지각방사선에 대한 핵분광학적 연구를 수행하였는바 지각방사선장의 핵분광학적 특성차이를 규명하기 위하여 지면의 자연방사성 핵종분포가 대표적 전형인 충남대학교 캠퍼스내 미경작 개활지 잔디밭과, 우라늄 함량이 높은 곳으로 알려진 괴산군 덕평리 지역 등 특이한 두 지역을 측정지점으로 선택하였다. 환산선량의 비교확인을 위하여 HPGe 분광측정은 3″ø×3″원통형 NaI(T1) 섬광검출기에 의한 분광측정과 동시에 수행하였으며 본 연구에 사용된 HPGe 검출기에 대한 스펙트럼-선량율 환산인자 G(E)는 감마선속이 검출기 축에 수직 입사하는 것으로 가정하고 Monte Carlo 방법으로 씨뮬레이션한 감응스펙트럼들을 사용하여 산출하였다. 이 G(E)를 사용하여 산출된 선량율(D˙_Ge)은, 이미 기준기급 전리함과의 비교 교정을 통하여 스펙트럼-선량 환산체계가 확립된 바 있는 NaI(T1) 검출기로 구한 선량율(D˙_NaI)과 만족스러운 일치를 보였으며 D˙_Ge와 D˙_NaI 사이의 상관계수는 +0.9988, 회귀 방정식의 기울기는 1.001을 나타내었다. 측정한 스펙트럼에서는 미미한 크기의 ^137Cs 감마선 피크가 확인되었으나 1960년대에 수행되었던 대기권 핵실험의 영향이나 Chernobyl 원전사고의 영향은 관측되지 않았다. Study of terrestrial gamma-rays was carried out by means of in-situ spectrometry using high purity germanium (HPGe) detector system. Two distinguishable fields of measurements, namely, uncultivated flat lawns in CNU campus where the distribution of natural radionuclides in the ground in known to be quite typical and well-known uranium rich area of Dukpyung-ri in Gwoesan-kun were selected in order to specify the difference in spectrometric characteristics of the fields. In-situ HPGe spectromety was accompanied by scintillation spectrometry with 3″ø×3″cylindrical NaI(T1) detector for comparative confirmation of derived dose rates from the spectra measured. Spectrum-dose rate conversion operator, G(E), of our particular HPGe detector was calculated using response spectra simulated by Monte Carlo method with an assumption of gamma-ray beams incident vertically to the detector axis. Resultant dose rates (D˙_Ge) showed satisfactory agreement with those obtained by NaI(T1) spectrometry and corresponding G(E) operation (D˙_NaI) of which system has been well-established through intercalibration with a reference ion chamber. Correlation coefficient and the slope of regression equation between D˙_Ge and D˙_NaI came out to be +0.9988 and 1.001, respectively. Though traceable height of ^137Cs gamma-ray peak was identified on the field spectrum, ground contamination of fission products released from atmospheric nuclear test performed in 1960s and possibly from Chernobyl accident was not observed as of today.
Yi, Ha Woo,Kim, Su Mi,Kim, Sang Hyun,Shim, Jung Ho,Choi, Min Gew,Lee, Jun Ho,Noh, Jae Hyung,Sohn, Tae Sung,Bae, Jae Moon,Kim, Sung The Korean Gastric Cancer Association 2013 Journal of gastric cancer Vol.13 No.4
Purpose: Reoperations after gastrectomy for gastric cancer are performed for many types of complications. Unexpected reoperations may cause mental, physical, and financial problems for patients. The aim of the present study was to evaluate the causes of reoperations and to develop a strategic decision-making process for these reoperations. Materials and Methods: From September 2002 through August 2010, 6,131 patients underwent open conventional gastrectomy operations at Samsung Medical Center. Of these, 129 patients (2.1%) required reoperation because of postoperative complications. We performed a retrospective analysis of the patients using an electronic medical record review. Statistical data were analyzed to compare age, sex, stage, type of gastrectomy, length of operation, size of tumor, and number of lymph node metastasis between patients who had been operated and those who had not. Results: The variables of age, sex, tumor stage, type of gastrectomy, length of operation, and number of lymph node metastases did not differ between the 2 groups. However, the mean tumor size in the reoperation group was greater than that in the non-reoperation group ($5.0{\pm}3.7$ [standard deviation] versus $4.1{\pm}2.9$, P=0.007). The leading cause of reoperation was surgical-site infection (n=49, 0.79%). Patients with intra-abdominal bleeding were operated on again in the shortest period after the initial gastrectomy ($6.3{\pm}4.2$ days). Patients with incisional hernia were not reoperated on until after $208.3{\pm}81.0$ days, the longest postoperative period. Conclusions: Tumor size was the major variable leading to reoperation after gastrectomy for gastric cancer. The most common complication requiring the reoperation was a surgical site-related complication.
Epidemiological Investigation on Botulism of Cattle in Northern Gyeonggi-do between 2011 and 2012
Woo seog Jeong,Jeong Kyoung Bae,Woo Jin Jeon,Youn Ju Kim,Ha chung Yoon,Woo Seok Chang,Sung Chul Hwang,Jee Hye Kim,Yong Ju Lee,Myeong Soo Kim,Do Soon Kim,Yi Seok Joo,So Young Park,Oun Kyong Moon 대한수의학회 2012 대한수의학회 학술대회발표집 Vol.2012 No.-
Epidemiological Investigation on Rabies in Suwon and Hwaseong, Gyeonggi-do
Woo Jin Jeon,Woo Seog Jeong,Jae Woon Jeong,Jeong Kyoung Bae,Youn Ju Kim,Ha Chung Yoon,Woo Seok Chang,Sung Chul Hwang,Jee Hye Kim,Yong Ju Lee,Myeong Soo Kim,Do Soon Kim,Yi Seok Joo,Oun Kyong Moon 대한수의학회 2012 대한수의학회 학술대회발표집 Vol.2012 No.-
YI Sae Eun,Park Jun Woo,Kwak Jang Wook,Choi Yeonjoo,Lee Sang Hun,Ha Seung Cheol,박홍주 대한평형의학회 2021 Research in Vestibular Science Vol.20 No.2
Objectives: Pathophysiology of vestibular migraine (VM) is still controversial. Vertigo may act as a trigger for migraine or there might other mechanisms which cause migraine and dizziness. VM patients have headaches and dizziness simul-taneously or sequentially. Therefore, we hypothesized that the sequence of symptoms might suggest different mechanisms and compared the results of vestibular func-tion tests (VFTs) according to chronological order of headache and vertigo. Methods: Forty-two patients with VM were included. They were divided into three subgroups according to the chronological orders of headache and vertigo, and the results of VFTs and the symptomatic improvement were compared between each group. Results: Dizziness appeared first in 15 patients (35.7%), both symptoms appeared simultaneously in 20 patients (47.6%), and headaches appeared first in 7 (16.7%). There were no significant differences in symptom duration among the groups. Fourteen (33.3%) showed abnormal caloric results, 7 (16.7%) in head impulse test, 16 (38.1%, vestibular score) and 19 (45.2%, composite score) in sensory organizing test, and 13 (31.0%) in vestibular evoked myogenic potential test. Abnormal rate of the caloric test in the simultaneous group was significantly lower than those of the other two groups. Nineteen (45.2%) showed complete remission in 3 months after preventive medication with no significant difference between each group. Conclusions: VM patients whose vertigo occurred with headache simultaneously showed lower incidence of caloric abnormality, suggesting that they have abnormality in central vestibular system rather than peripheral vestibular organs.
Yi Quan,Kang Luo,Sheng Cui,Sun Woo Lim,신유진,Eun Jeong Ko,Ju Hwan Kim,Sang J. Chung,Soo Kyung Bae,Byung Ha Chung,Chul Woo Yang 대한내과학회 2020 The Korean Journal of Internal Medicine Vol.35 No.6
Background/Aims: Coenzyme Q10 (CoQ10) has antioxidant effects and is commercially available and marketed extensively. However, due to its low bioavailability, its effects are still controversial. We developed a water-soluble CoQ10-based micelle formulation (CoQ10-W) and tested it in an experimental model of tacrolimus (TAC)-induced diabetes mellitus (DM). Methods: We developed CoQ10-W from a glycyrrhizic-carnitine mixed layer CoQ10 micelle preparation based on acyltransferases. TAC-induced DM rats were treated with either lipid-soluble CoQ10 (CoQ10-L) or CoQ10-W for 4 weeks. Their plasma and pancreatic CoQ10 concentrations were measured using liquid chromatography- tandem mass spectrometry. The therapeutic efficacies of CoQ10-W and CoQ10-L on TAC-induced DM were compared using functional and morphological parameters and their effects on cell viability and reactive oxygen species (ROS) production were also evaluated in cultured rat insulinoma cells. Results: The plasma CoQ10 level was significantly increased in the CoQ10-W group compared to that in the CoQ10-L group. Intraperitoneal glucose tolerance tests and glucose-stimulated insulin secretion revealed that CoQ10-W controlled hyperglycemia and restored insulin secretion significantly better than CoQ10-L. The TAC-mediated decrease in pancreatic islet size was significantly attenuated by CoQ10-W but not by CoQ10-L. TAC-induced oxidative stress and apoptosis were significantly more reduced by CoQ10-W than CoQ10-L. Electron microscopy revealed that CoQ10-W restored TAC-induced attenuation in the number of insulin granules and the average mitochondrial area, unlike CoQ10-L. In vitro studies showed that CoQ10-L and CoQ10-W both improved cell viability and reduced ROS production in TAC-treated islet cells to a similar extent. Conclusions: CoQ10-W has better therapeutic efficacy than CoQ10-L in TAC-induced DM.