• 아동학회지
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• 제29권3호
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• pp.319-338
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• 2008

This study aimed to develop the components of Korean creativity and to examine differences between responses of Korean and US students. Seven experts were interviewed to establish components of Korean creativity. College students in Korea (1,210) and college students in the US (514) responded to the questionnaire. Analysis was by principal component analysis, independent sample t-test, and qualitative analysis. Results were: (1) five factors of Korean creativity consisted of elaboration, redirection, novelty, understanding-the-new-by-exploring-the-old (UE), and freethinking. (2) Korean students scored higher on elaboration and UE, and American students were better at redirection, novelty, and freethinking. (3) Each of the seven interviewees identified five factors of Korean creativity, but the factors varied according to their fields of expertise.

• 한국패션뷰티학회지
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• 제3권3호
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• pp.24-30
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• 2005

If one can say that 'Retro' is a revived mode of the style, which was popular in the past, it is confirmed that various complex social and cultural factors have been reflected to making the current and new mode by accepting the past style. By investigating the impact of hippie style, which was popular during the Vietnam War on cosmetics and beauty culture, and the retro-tendency NEO-Hippie style fashion phenomenon appeared at around the time of the US and Iraq War, a theoretical foundation of cosmetics and beauty culture in the 2000s was established, and periodical circulation of fashion was tried to be understood. The 9.11 terrorists' attack and US-Iraq War devastated the heart of modern people, and for this, a retro trend having a meaning to revive the past style with nostalgia of the old things started to be handled with major interests in cosmetics and beauty culture. The retro-style, which is revived in the 2000s, is not the unchanging imitation mode in the '60s and '70s during the Vietnam War, but a newly transformed type of style.

• 한국정보처리학회논문지
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• 제5권5호
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• pp.1257-1263
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• 1998

위성 동보 서비스를 위하여 가입자 정보를 분산 관리하는 계층화 구조로서 가입자 지구국을 그룹 관리하는 부제어국을 설치한 계층 구조로 제안하고 해석하였다. 위성 동보 서비스를 위한 지구국 구성을 가입자국과 부제어국간 그리고 부제어국과 중신국간의 링크에 대한 통신 처리 시간비를 파라미터로 한 폴링 방법에 의한 수신 상태의 응답처리시간을 최소로하는 최적값을 해석하고 이를 3 계층 구성에서 처리할 수 있음을 알 수 있었다. 이러한 3 계층 구성을 하여 사용자국과 부제어국간 억세스 통신 비용의 절감이 요구되는 경우, 지상 공중망을 제어회선으로 사용하고, 통신 비용이 거리 의존성이 있는 경우에는 종래의 2 계층 구성에 비교하여 계층화 비용을 절감할 수 있음을 알 수 있었다.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.1-10
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• 2021

This study examines the dynamic pattern of the exchange rate volatilities of the ASEAN-5 currencies from January 2006 to August 2020. The exchange rates applied in this study comprise bilateral and effective exchange rates in order to investigate the influence of the US dollar on the stability of the ASEAN-5 currencies. Since a volatility model employed in this study is a natural cubic spline volatility model, the Monte Carlo simulation is consequently conducted to determine an appropriate criterion to select a number of quantile knots for this model. The simulation results reveal that, among four candidate criteria, Generalized Cross-Validation is a suitable criterion for modeling the ASEAN-5 exchange rate volatilities. The estimated volatilities showed the inconstant dynamic patterns reflecting the uncertain exchange rate risk arising in international transactions. The bilateral exchange rate volatilities of the ASEAN-5 currencies to the US dollar are more variable than their corresponding effective exchange rate volatilities, indicating the influence of the US dollar on the stability of the ASEAN-5 currencies. The findings of this study suggest that the natural cubic spline volatility model with the quantile knots selected by Generalized Cross-Validation is practical and can be used to examine the dynamic patterns of the financial volatility.

• 대한의용생체공학회:의공학회지
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• 제43권3호
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• pp.153-160
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• 2022

As new types of medical devices are emerging through convergence with advanced technology, innovative technologies are becoming hot issues in health policy because of their disruptiveness. This study analyzed the innovative medical device management systems in the US, China and Korea. Innovative medical devices have been defined differently depending on the country's management system, but in common, they are defined as products that do not exist or have dramatically improved performance compare to existing products by applying innovative technologies. Innovative medical devices have been supported by regulatory authorities during product development and approval processes. While the US and China have more than 300 products designated as innovative medical devices with diverse functions, application fields, and manufacturing countries considering the initial situation of the implementation for the system, Korea has only 16 products, mainly radiology and diagnostic devices and made in Korea only as innovative medical device. In addition, Korea shows the highest market approval rate of innovative medical devices compare to the US and China, and it is necessary to prepare the approval process in consideration of product diversity.

• 분석과학
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• 제15권3호
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• pp.196-213
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• 2002

물 시료 중 알킬페놀류, 클로로페놀류 및 비스페놀 A의 동시분석을 기체크로마토그래피/질량분석기-선택이온검색법을 사용하여, US EPA 분석방법, isoBOC 유도체화 분석방법과 TBDMS 유도체화 분석방법을 비교하였다. 시료의 전처리는 유기용매로 추출하고 농축하여 분석한 방법과 XAD-4를 이용한 액체-고체 추출 후 isoBOC 유도체화와 TBDMS 유도체화를 실시하였다. 11종의 페놀류에 대한 회수율 실험은 3차 증류수에 각각 10 ${\mu}g/{\ell}$ (US EPA 방법) 또는 2 ${\mu}g/{\ell}$ (isoBOC 유도체화 분석방법과 TBDMS 유도체화 분석방법)의 농도를 대상으로 측정한 결과 각각 85.1~109.9%와 90.3~126.6%의 결과를 얻었다. 각 분석방법의 비스페놀 A에 대한 분석방법 검출한계는 US EPA 분석방법, isoBOC 유도체화 분석방법과 TBDMS 유도체화 분석방법이 각각 0.732 ${\mu}g/{\ell}$, 0.002 ${\mu}g/{\ell}$와 0.021 ${\mu}g/{\ell}$로 나타났으며, $5{\sim}400ng/{\ell}$의 농도 범위에서 isoBOC 유도체화 분석방법과 TBDMS 유도체화 분석방법 각각 0.9755~0.9981과 0.9908~0.9996의 직선성을 보였다. 폴리에틸렌 공장의 방류수를 대상으로 잔류량을 측정한 결과 일부페놀이 검출한계 이하에서 흔적으로 나타났다.

• Childhood Kidney Diseases
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• 제23권1호
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• pp.36-42
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• 2019

Purpose: We investigated whether a renal size discrepancy on a renal sonogram (US) in children with febrile urinary tract infection (UTI) was correlated with the presence of cortical defects on their dimercaptosuccinic acid (DMSA) renal scan. Methods: We examined 911 children who were admitted consecutively to our hospital with their first episode of febrile UTI from March 2001 to September 2014. All enrolled children underwent a US and DMSA scan during admission. According to the US findings, including the renal size discrepancy, data were compared between children with positive and negative DMSA scan results. A positive DMSA scan result was defined as reduced or absent tracer localization and indistinct margins that did not deform the renal contour. Results: Mean renal lengths of the right and left kidneys were larger in children with positive DMSA scan results than in children with negative DMSA scan results ($63.2{\pm}11.3mm$ vs. $58.4{\pm}7.8mm$, P<0.001; $64.9{\pm}11.2mm$ vs. $59.9{\pm}7.9mm$, P<0.001; respectively). A significant difference was observed in both renal lengths between children with positive and negative DMSA scan results ($4.6{\pm}3.8mm$ vs. $3.3{\pm}2.6mm$, P<0.001). A multiple logistic regression analysis, revealed that a small kidney, cortical thinning, and a renal length discrepancy on US findings were significant factors for predicting the presence of cortical defects on an acute DMSA scan [P=0.028, 95% confidence interval (CI) 1.054-2.547; P= 0.004, 95% CI 1.354- 4.810; P<0.001, 95% CI 1.077-1.190, respectively]. Conclusion: In conclusion, a renal size discrepancy on US findings in children with their first episode of febrile UTI was a helpful tool for predicting the presence of cortical defects on an acute DMSA scan.

• 대한족부족관절학회지
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• 제26권3호
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• pp.123-129
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• 2022

Purpose: To evaluate the correlation between the fibrillar pattern of the Achilles tendon on ultrasonography (US) and functional outcomes in patients who underwent open tendon repair after Achilles tendon rupture. Materials and Methods: Data of 44 patients who had been subjected to US at least 6 months after repair, during the period between July 2012 and July 2019 were reviewed. Those with bilateral tendon rupture, re-rupture, open injury, and chronic or insertional rupture, were excluded from the review. We divided them into two groups, the homogenous group (HoP) and the heterogenous group (HeP) based on the fibrillar pattern on US. We also divided the HoP into linear and wavy subgroups, and the HeP into no hypoechoic lesion and hypoechoic lesion subgroups. The rupture type of the Achilles tendon, radiographic factors including US and magnetic resonance images, patient-related, surgical factors, and clinical results at the last visit after repair were assessed retrospectively. Results: The tendon thickness was 11.4±1.7 mm in the HoP, and 14.5±3.0 mm in the HeP (p<0.001). A shredded pattern was observed in 17 cases (65.4%) in the HoP, and in 17 cases (94.4%) in the HeP (p=0.031). The mean value of the number of sutures used was 8.9±3.05 in the HoP and 11.39±1.75 in the HeP (p=0.001). The mean value of the difference in calf circumference was 0.9±0.67 cm in the HoP and 1.36±0.71 cm in the HeP (p=0.037). There were no statistically significant differences in the fibrillar patterns and patient-related factors. Conclusion: The fibrillar pattern observed after repair was correlated with the functional outcome and showed a significant relationship with the rupture pattern and the number of sutures used. Therefore, we suggest a careful individualized postoperative rehabilitation protocol to maximize functional outcomes by referring to the fibrillar pattern in US, especially in shredded ruptures.

• 대한영상의학회지
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• 제81권1호
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• pp.157-165
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• 2020

목적 S-Shearwave를 이용하여 유방 병변을 감별하는데 있어 최적의 cut-off 값과 종괴 내 위치를 알아보고 진단적 가치를 평가하고자 한다. 대상과 방법 연구 기간 동안 197명의 여성에서 225개의 유방 병변을 평가하였다. S-Shearwave 값은 초음파 기기에서 자동적으로 생성된 사각형의 region-of-interest로 측정하였다. 병변 내 서로 다른 네 군데에서 각각 세 번 측정하였으며 세 개의 중위 값 중 최대 값을 이용해 각각의 위치에서 최적의 cut-off 값을 계산하였다. 진단적 가치는 area under the receiving operator characteristics curve (이하 AUC)를 통해 평가하였다. 결과 총 225개의 유방 병변 중 156개(69.3%)는 양성, 69개(30.7%)는 악성이었다. 평균 SShearwave 값은 악성 병변이 양성 병변에 비해 유의미하게 높았다(108.0 ± 70.0 kPa vs. 43.4 ± 38.3 kPa, p < 0.001). 하지만 병변 내 위치에 따른 값의 유의미한 차이는 없었다. Cut-off 값을 41.9 kPa로 사용했을 때, 민감도 85.7%, 특이도 63.9%, 정확도 70.7%, 양성예측도 51.7% 및 음성예측도 90.8%였다. 초음파와 S-Shearwave 간의 AUC는 유의미한 차이를 보이지 않았다(p = 0.179). 결론 S-Shearwave는 유방 병변의 감별진단을 하는데 grayscale 초음파에 필적하는 진단적 가치를 가진다.

• 대한영상의학회지
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• 제84권3호
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• pp.596-605
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• 2023

목적 이 연구는 갑상선 수술 중 절제된 정상 부갑상선 검체를 이용하여 부갑상선의 초음파 소견을 알아보고자 한다. 대상과 방법 2020년 12월부터 2021년 3월까지 갑상선 수술을 시행한 17명 환자의 34개 부갑상선을 분석하였다. 모든 정상 부갑상선은 자가이식전 동결 절편을 통해 조직학적으로 진단되었고 부갑상선 검체를 무균 생리식염수에 넣은 상태에서 고해상 초음파 영상을 얻었다. 부갑상선 검체의 초음파 에코(고에코, 저에코), 에코결(균일, 불균일), 크기, 및 모양(난원, 원형)을 후향적으로 분석하였다. 두 명의 환자에서 얻은 3개의 부갑상선 에코를 절제된 갑상선 실질 에코와 비교하였다. 결과 모든 부갑상선은 생리식염수에 적신 거즈의 에코와 유사한 고에코를 나타냈다. 균일한 고에코는 32개(94.1%)의 부갑상선에서 관찰되었고 3개의 부갑상선은 갑상선 실질보다 높은 에코를 나타냈다. 부갑상선의 장경은 5.1-9.8 mm (평균 7.1 mm)였고, 모양은 33개(97.1%)부갑상선에서 난원형을 보였다. 결론 부갑상선 검체의 에코는 모두 고에코를 나타냈고, 작은 크기의 균일한 고에코를 보이는 난원형 구조물은 부갑상선의 특징적 초음파 소견이었다.