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      • KCI등재

        주거용 RC 벽식 건물의 시공 중 재현주기에 따른 지진하중의 영향

        최성현,김재요 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 논문집 Vol.26 No.2

        Even though the structural safety is confirmed in the design stage, the structural safety is not guaranteed in the construction stage because the structural system is not completed. In addition, since the construction period is shorter than the period of use of the building after completion, it is excessive to apply the same seismic load to the construction stage as in the design stage. ASCE 37-14 presents the concept of seismic load reduction factor during construction, but does not provide a clear application method. Therefore, in this study, the seismic load reduced according to the return period was applied to the example model of a residential middle-rise RC building. The construction stage of the example model was divided into five-story units, and seismic load with the change of the return period was applied to the construction stage models to analyze the change of seismic load during construction and to check the sectional performances of structural members. By comparing the design strength ratio of the shear wall at the design stage and the construction stage, the range of seismic load magnitudes that can assure the safety during construction of a residential middle-rise RC building was analyzed in terms of the return period. 설계단계에서 구조적 안전성을 확인하더라도, 시공단계에서는 구조시스템이 완전히 형성되지 않아 구조적 안전성이 보장되지 않는다. 또한 시공 기간은 완공된 이후의 건물의 사용기간보다 짧기 때문에 설계단계에서와 같은 지진하중을 시공단계에 적용하는 것은 과다하다. ASCE 37-14는 시공 중 지진하중 저감계수의 개념을 제시하고 있지만, 명확한 적용 방법을 제공하지 않고 있다. 따라서, 이 연구에서는 재현주기에 따라 저감한 지진하중을 주거용 중층 RC건물의 예제 모델에 적용하였다. 예제모델의 시공단계를 5층 단위로 구분하였으며, 시공단계 모델들에 재현주기 변화에 따른 지진하중을 적용하여 시공 중 지진하중을 분석하고 구조 부재의 단면성능 검토를 수행하였다. 설계단계와 시공단계에서의 전단벽 설계강도비를 비교하여, 주거용 중층 RC 건물의 시공 중 안전성을 확보할 수 있는 지진하중 크기의 범위를 재현주기의 관점에서 분석하였다.

      • 수술 중 C-Arm Neutral AP 검사 시 조절인자에 따른피폭선량 및 화질비교 (L-Spine AP검사를 기준으로)

        최성현,조황우,동경래,정운관,최은진,송하진 한국방사선산업학회 2015 방사선산업학회지 Vol.9 No.2

        Purpose: Time of operation has been reduced and accuracy of operation has beenimproved since C-arm, which offer real-time image of patient, was introduced in operation room. However, because of the contamination of patient, C-arm could not be used more appropriately. Therefore, this study is to know factors of controlling exposure dose, image quality and theexposed dose of health professional in operation room. Materials and methods: Height of Wilsonframe (bed for operation) was fixed at 130 cm. Then, Model 76-2 Phantom, which was set byassembling manual of Fluke Company, was set on the bed. Head/Spine Fluoroscopy AEC modewas set for exposure condition. According to detector size of C-arm, the absorbed dose per minwas measured in the 7 steps OFD (cm) from 10 cm to 40 cm (10, 15, 20, 25, 30, 35, 40 cm). Ineach step of OFD, the absorbed dose per min of same diameter of collimation was measured. Moreover, using Nero MAX Model 8000, exposure dose per min was measured according to 3 stepof distance from detector (20 cm, 60 cm, 100 cm). Finally, resolution was measured by CDRH DiscPhantom and magnification of each OFD was measured by aluminum stick bar. Result: Accordingto detector size of C-arm, difference of absorbed dose shows that the dose of 20 cm OFD is 1.750times higher than the dose of 40 cm OFD. It means that the C-arm, which has smaller size ofdetector, shows the bigger difference of absorbed dose per min (p<0.05). In the differenceofabsorbed dose in the same step of OFD (from 20 cm to 40 cm), the absorbed dose of 9 inch detector C-arm was 1.370 times higher than 12 inch’ s (p<0.05). When OFD was set to 20 cm OFD, theabsorbed dose of non-collimation case was approximately 0.816 times lower than the absorbeddose of collimation cases (p<0.05). When the distance was 20 cm from detector, exposed does in cludes first-ray and scatter-ray. When the distance was 60 cm and 100 cm from detector, exposeddoes includes just scatter-ray. So, there was the 2.200 times difference of absorbed does. Finally,when OFD was increased, spatial resolution was 4 to 5 step was increased. However, low contrastresolution was not relative. Moreover, there was 1.363 times difference of magnification (p<0.05). Conclusion: When C-Arm is used, avoiding contamination of patient is more important factor thanreducing exposed dose of health professional in operation room. Just controlling exposure time isjust way to reduce the exposed does of workers. However, in the case, non-probability influencecould be occurred. Therefore, this study proved that the exposed dose will be reduced if the factorssuch as using small detector size of C-arm, setting OFD from 20 cm to 25 cm and non-collimating. Moreover, dose management of C-arm in the non-interesting area will be considered additionally.

      • 소아 환자의 성별과 연령별 생식선 차폐체 제작을 통한유용성 평가

        최성현,박중은,동경래,정운관,주용진,양남희 한국방사선산업학회 2015 방사선산업학회지 Vol.9 No.2

        Purpose: The gonad shielding is used to minimize the impact of the exposure to gonadswhen Abdomen, Pevis and Hip X-ray inspections are conducted on radiation impressionable pediatricpatients. By the way, the gonad is palpable difficult and impossible to check visually becauseit’s a sensitive area, so tests are conducted with the approximate location of shielding, therebyappearing problems of not shielding gonads accurately. Accordingly, this study produced shieldsby age and gender of pediatric patients and studied the method of positioning shields with ASIS asa reference point without palpable sensitive areas, and tried to evaluate its usability. Materials andmethods: The study surveyed 30 pediatric patients by gender and age, who came and got inspectedin Department of Radiology, our hospital from February 2012 to January 2014 and obtained thevalue of tolerance by measuring the average size of the pelvis using the distance measurementfunction of Infinitt Piview with the images stored in the PACS and producing shields by age andgender of pediatric patients and specifying the areas at random for the comparative analysis ofpre- and post-using. It calculated the technology statistics (mean±SD) with the value of tolerancemeasured the length using SPSS 12.0 statistical program. Results: As for boys, differences in thetolerance range of pre- and post-using shields were 2.69 mm in case of 1 year old, 2.58 mm in2 years, 2.37 mm in 3 years, 2.815 mm in 4~5 years, 2.043 mm in 7~10 years, and as for girls,1.92 mm in 1~2 years, 1.75 mm in 3~4 years, 2.52 mm in 5~6 years and 1.93 mm in 7~10. After analyzing the pre- and post-using shields for all of boys and girls, there were statisticallysignificant differences (P<0.050). Conclusions: It is considered that we can minimize the exposureto gonads and get a better video for diagnosis in testing high biological impressionable pediatric,if we use shields correctly with ASIS as a reference point considering its shape and size by age and gender in Abdomen, Pevis and Hip X-ray inspections Purpose: The gonad shielding is used to minimize the impact of the exposure to gonadswhen Abdomen, Pevis and Hip X-ray inspections are conducted on radiation impressionable pediatricpatients. By the way, the gonad is palpable difficult and impossible to check visually becauseit’s a sensitive area, so tests are conducted with the approximate location of shielding, therebyappearing problems of not shielding gonads accurately. Accordingly, this study produced shieldsby age and gender of pediatric patients and studied the method of positioning shields with ASIS asa reference point without palpable sensitive areas, and tried to evaluate its usability. Materials andmethods: The study surveyed 30 pediatric patients by gender and age, who came and got inspectedin Department of Radiology, our hospital from February 2012 to January 2014 and obtained thevalue of tolerance by measuring the average size of the pelvis using the distance measurementfunction of Infinitt Piview with the images stored in the PACS and producing shields by age andgender of pediatric patients and specifying the areas at random for the comparative analysis ofpre- and post-using. It calculated the technology statistics (mean±SD) with the value of tolerancemeasured the length using SPSS 12.0 statistical program. Results: As for boys, differences in thetolerance range of pre- and post-using shields were 2.69 mm in case of 1 year old, 2.58 mm in2 years, 2.37 mm in 3 years, 2.815 mm in 4~5 years, 2.043 mm in 7~10 years, and as for girls,1.92 mm in 1~2 years, 1.75 mm in 3~4 years, 2.52 mm in 5~6 years and 1.93 mm in 7~10. After analyzing the pre- and post-using shields for all of boys and girls, there were statisticallysignificant differences (P<0.050). Conclusions: It is considered that we can minimize the exposureto gonads and get a better video for diagnosis in testing high biological impressionable pediatric,if we use shields correctly with ASIS as a reference point considering its shape and size by age and gender in Abdomen, Pevis and Hip X-ray inspections.

      • KCI등재

        Study of Functional Cosmetics Based on Stem Cell Technology

        최성현,윤지수,권상모 한국조직공학과 재생의학회 2015 조직공학과 재생의학 Vol.12 No.4

        Considering the steady increase in life expectancy slowing or reversing the deleterious effects of aging has garnered considerable interest. Accordingly, functional cosmetics based on stem cell technology (Stem cell cosmetics), which combine the anti-aging concept with high technology, is an emerging trend in the cosmetics industry. Stem cells possess self-renewal properties and the potency to differentiate. Therefore, stem cells are the most important cells in the skin, as they are the source for continuous regeneration of the epidermis. Stem cell cosmetics are developed based on stem cell technology, which involves using extracts or culture media of stem cells. However, cosmetics containing stem cells or their extracts have not been released into the market due to legal, ethical, and safety concerns. Meanwhile, plant stem cells, which circumvent these problems, are highly regarded in the cosmetics industry for improving culture technology. The European Union prohibits the use of cells, tissues, or products of human origin in cosmetics, whereas the Korea Food and Drug Association has allowed the use of sources originating from stem cell media in cosmetics since 2009. The global cosmetics market is worth more than 242 billion dollars; however, cosmetic companies across the world that are developing and launching stem cell cosmetics based on stem cell activators, culture extracts, and culture media are much more focused on the Korean cosmetic market.

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