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안교진,이윤석,차용성,김현,An, Gyo Jin,Lee, Yoonsuk,Chan, Yong Sung,Kim, Hyun Korean society of Clincal Toxicology 2018 대한임상독성학회지 Vol.16 No.1
Purpose: Glufosinate ammonium poisoning can cause seizures, even after a symptom-free period. This study was conducted to evaluate the relationship between serum neuron specific enolase (NSE) level and the occurrence of seizures in patients with acute glufosinate ammonium poisoning. Methods: For this retrospective observational study, data from patients diagnosed with acute glufosinate ammonium poisoning were collected between January 2016 and June 2016. Serum NSE was measured within 2 hours of arrival at the emergency department. The patients were divided into a seizure group and a non-seizure group. Results: The seizure group included eight of the 15 total patients (53.3%). The serum NSE level was significantly higher in the seizure group than in the non-seizure group ($32.4{\pm}11.9ng/mL$ vs. $19.5{\pm}5ng/mL$, p=0.019). The amount of glufosinate ingested and initial and peak serum ammonia levels were significantly higher in the seizure group than in the non-seizure group. There was no significant difference in the area under the curve of the serum NSE level or the initial and peak serum ammonia levels in terms of predicting the occurrence of seizures. Conclusion: In acute glufosinate poisoning, initial serum NSE levels may help in prediction of seizures.
Effectiveness of Autogenous Tooth Bone Graft Combined with Growth Factor: Prospective Cohort Study
안교진,김영균,윤필영,이부규 대한치의학회 2013 Journal of korean dental science Vol.6 No.2
Purpose: Autogenous tooth bone graft is proven to be efficient. We evaluated the bone healing effect and clinicalcapabilities of autogenous tooth bone materials as a scaffold when growth factor is used together with this material. Materials and Methods: Subjects were those who needed implant placement and bone graft because of missingtooth or alveolar bone defect and who kept their autogenous tooth or needed extraction of other tooth. Group Iincluded autogenous tooth bone graft with growth factor, whereas Group II had only autogenous tooth bone graft. We investigated the bone healing state through computed tomography taken just before surgery and 3 to 4 monthsafter surgery to evaluate the effectiveness of bone graft. Group I had 9 patients, whereas Group II had 5 patients. Wecompared the pre- and post-operative increase of the Hounsfield unit and bone height by analyzing the computedtomography images. Result: Sinus bone grafts numbered 8 cases, and vertical ridge augmentation was performed together with 3 casesof these. Vertical ridge augmentation was performed in 2 cases, and horizontal ridge augmentation in 1 case alone. Socket graft was done in 3 cases. The post-operative mean value of the Hounsfield unit was 960 in Group I and 836.7in Group II, but the increase was almost similar, i.e., 636.9 in Group I and 634.7 in Group II on the average. Increase ofbone height was 7.6 mm in Group I and 11.1 mm in Group II on the average. This difference was attributable to thefact that most of the cases were sinus bone graft in Group II. Conclusion: In this study, we suggest the possibility of autogenous tooth bone graft materials as a scaffold besidestheir bone healing ability.
Acrylonitrile 모노머를 함유한 UP 결합재의 개발
안교진,윤성길 강원대학교 석재복합신소재제품연구센터 2001 석재연 논문집 Vol.6 No.-
불포화 폴리에스테르(UP) 수지의 기계적 강도 등 물성을 개선하기 위하여, 본 연구에서는 모노머로서 스티렌과 함께 아크릴로니트릴(AN)을 사용하였다. UP 수지 중에서 총 모노머의 함량은 50 wt.%이며, 모노머 중에서 AN의 함량은 0~3wt.%로 변화하였다. 이와 같은 수지 조성물에 석재 분쇄물을 총중량에 대하여 70% 첨가하여 석재복합체를 제조한 후 압축강도 및 휨강도 등 물성을 측정하였다. DSC를 이용하여 중합과정에서의 반응속도와 전환율을 측정하였다. 만능시험기를 이용하여 인장 및 굴곡 실험을 실시하였다. AN의 첨가에 의해 인장강도는 62.8%, 굴곡강도는 24.8% 증대되었다. DMA를 사용하여 수지의 점탄성을 측정하였다. UP 수지의 석재 복합체의 경우 AN의 첨가에 의해 압축강도는 7%, 굴곡강도는 6% 증가되었으며, AN의 함량이 20%인 경우 가장 좋은 물성을 나타내었으며, AN의 함량이 30%이상인 경우는 물성이 저하되는 경향을 나타내었다. Linear Shrinkage method 따라 수축률을 측정하였다. AN의 함량이 증대될수록 수축률이 감소하여 양호한 물성을 나타내었다. 시료의 파단면을 SEM으로 관찰한 결과 AN의 함량이 증대됨에 따라 절단면의 표면이 거칠게 나타났다. 따라서 AN의 첨가에 의해 시료의 강인도가 증대됨을 확인하였다. In order to improve mechanical properties of unsaturated polyester(UP) resins, acrylonitrile was used as a monomer together with styrene. The contents of monomer of UP resins is 50wt.%, and the contents of acrylonitrile in the monomer was changed as 0~30wt.%. Mechanical properties of the composite materials containing aggregates by 70wt% was measured by a universal tensile machine. Reaction rate and conversion of UP resins were tested by DSC measurement, and the thermo-mechanical properties of UP resins were measured by DMA. Tensile and flexural strength increased by 62.8% and 24.8% by increasing the acrylonitrile ratio in the monomers, respectively. Tensile and flexural strength of the composites increased as 7% and 6% by adding acrylonitrile as a comonomer. The composite containing 20 wt% acrylonitrile in monomer showed relatively good properties, while mechanical properties of the composites containing 30 wt% acrylonitrile become worse. DMA results showed the improved thermo-mechanical properties by the use of acrylonitrile as a co-monomers. Volume shrinkage of the cured resin measured by linear shrinkage method was slightly improved by the use of acrylonitrile in the monomers. SEM photographs of the cured UP resins prepared by acrylonitrile as a co-monomer showed crude fracture surface morphology, that might be related with the high toughness properties of the resins.
안교진,김연수 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Hydrogel-based sensors have received considerable attention due to their promising applications in wearable devices. However, manufacturing hydrogels that combine toughness, anti-freezing properties, and conductivity remains a great challenge. Here, the hydroxyethyl acrylate (HEA)-based hydrogel can be prepared by using laponite as a crosslinking agent, and excellent mechanical properties can be exhibited by controlling methyl methacrylate (MMA), a hydrophobic monomer, and adding LiCl. Also, due to the presence of the conductive ion, LiCl, the hydrogel exhibits high ionic conductivity and an anti-freezing effect. Moreover, P(HEA-co-MMA) hydrogels are tough wearable sensors that can detect both large-scale human movements and small physiological signals. This strategy is expected to provide new inspiration for the development of tough wearable hydrogel sensors.
항공 소재 물성 데이터에 대한 분포 적합성 비교 평가 및 고찰
안교진,신재호,김영순 국방기술품질원 2024 국방품질연구논집 Vol.6 No.1
The aim of this study is to evaluate and select the most appropriate test methods for assessing the goodness of fit of aerospace material property data. Obtaining airworthiness certification is critical for ensuring aircraft operational use, and statistical analysis is crucial for verifying material properties through testing. The specimens selected to represent the material population must account for the diversity arising from production processes and exhibit the inherent variability, which may affect the material behavior. By employing these specimens, standardized tests are conducted, followed by statistical analyses to determine the material allowables. These allowables are integral to aircraft design because they significantly affect both performance and quality. Consequently, selecting the correct distribution for data analysis is crucial as it improves the modeling of material allowables and thus the overall reliability. Furthermore, this study can benefit the aerospace industry by offering comprehensive insights into material development, which can enhance quality and foster deeper understanding regarding material property data.