높은 스위칭 주파수를 가지는 비엔나 정류기의 전류 품질 개선

양송희(Songhee Yang),박진혁(Jin-Hyuk Park),이교범(Kyo-Beum Lee) 전력전자학회 2017 전력전자학회 논문지 Vol.22 No.2

모델 지도자의 지도신념과 직업만족도, 지도효능감과의 관계

양송희(Yang, SongHee) 한국모델콘텐츠학회 2020 한국모델콘텐츠학회지 Vol.1 No.1

이 연구는 국내 모델 지도자의 지도신념, 직업만족도, 지도효능감과의 관계를 알아보기 위해 실시하였으며, 현재 모델 아카 데미, 학교 그리고 대학에서 모델지도를 하고 있는 전국 모델지도자 41명을 대상으로 조사하였다. 측정도구로는 지도신념 (조인진, 2008), 직업만족도(김태수, 2013), 지도효능감(황은영, 2005)에 관한 설문지가 사용되었으며 수집된 자료는 SPSS 21.0 을 이용하여 빈도분석, 탐색적 요인분석과 신뢰도 분석, 상관관계분석, 독립 t-검증, 다중회귀분석을 실시하였다. 결과는 다 음과 같다. 첫째, 지도신념은 모델지도자의 학력, 모델지도 자격증 유무에 따라 유의한 차이가 있으며 직업만족도는 모델지 도자 학력에 따라 유의한 차이가 있는 것으로 나타났고, 지도효능감은 학력에 따라 유의한 차이가 있는 것으로 나타났다. 둘째, 모델지도자 지도신념은 직업만족에 유의한 영향을 미치는 것으로 나타났고, 지도효능감에도 유의한 영향을 미치는 것 으로 나타났다. 이는 신념이 학습자와 지도자에게 중요한 요인임을 알 수 있고, 지도자가 올바른 신념을 가지고 지도에 임하 면 교육의 질적 향상과 지도자 스스로의 만족감도 증가하여 학습현장에서 긍정적인 영향을 미칠 것으로 사료된다. 따라서 이 연구는 모델지도자의 확고하고 긍정적인 지도신념 인식 확대 필요성 및 중요성을 함의하고 있다 This study was conducted to look into further depths of relationship of domestic model leaders' leadership beliefs, job satisfaction and leadership efficacy. Forty one nationwide model leaders have been surveyed who are currently working at model academies, schools and universities. We collected questionnaire and used scale of teaching belief(Jo, Injin, 2008), job satisfaction(Kim, Taesu, 2013) and teaching efficacy (Hwang, Eunyoung, 2005) as research tool, and the data were analyzed using frequency analysis, exploratory factor analysis, correlation analysis, independent t-test and multiple regression analysis with SPSS 21.0 Version for Windows. Here's the research finding discovered in this study. First, there was a significant difference in the teaching belief depending on the model instructors' academic background and the presence or absence of a model teaching certificate, and the job satisfaction and teaching efficacy were found to be significantly different depending on the model instructors' academic background. Second, the model instructors' teaching belief was found to have a significant effect on job satisfaction and teaching efficacy. With the right-minded belief, not only the quality of education and the satifaction of the teaching will improve but also the learning field as a whole will have a positive effect. Therefore, this study implies the necessity and importance of expanding awareness of model leaders' firm and positive principle beliefs.

Shear Strength Behavior of Coarse-Grained Saline Soils after Freeze-Thaw

Songhe Wang,Jiulong Ding,Jian Xu,Jianwei Ren,Yugui Yang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6

The bearing capacity of embankment filled by coarse-grained saline soils will be deteriorated after freeze-thaw, especially when shallow groundwater is included. Direct shear tests were carried out on coarse saline specimens that experienced freeze-thaw cycling. The shear strength of soil specimens at three densities strongly depends upon the normal stress when freeze-thaw is not involved, manifesting as a linear increase. Strength indexes such as cohesion and internal friction angle grow at higher dry densities while little change noted in the residual. The cohesion increases with salt content but lowers with freeze-thaw, especially in initial five cycles, beyond which it stabilizes. The internal friction angle is not associated with the above two factors. The stress-strain curves after freeze-thaw are all strain softening, especially at higher densities. The shear stress exhibits larger influence on particle crushing than freeze-thaw. The modified relative breakage index was calculated based on particle grading curves, and is negatively correlated with the cohesion. An empirical equation was proposed by fitting test data incorporating both salt content and freeze-thaw cycles. Comparisons prove that the calculated cohesion agrees well with the measured data.

Underutilisation of Physical Rehabilitation Therapy by Cancer Patients in Korea: a Population-based Study of 958,928 Korean Cancer Patients

Cho Songhee,Chung Seung Hyun,Kang Minjoo,Jo Aejeong,Sim Sung Hoon,Kim Yu Jung,Yang Eun Joo 대한의학회 2021 Journal of Korean medical science Vol.36 No.46

Background: Advanced cancers are associated with more severe symptoms and greater impairment. Although most patients with metastatic cancer would benefit from rehabilitation, few patients receive appropriate rehabilitation therapy. We explored the use of rehabilitation therapy by cancer patients. Our data represented the entire population of Korea. The analyses were performed according to cancer type and stage. Methods: We extracted rehabilitation utilization data of patients newly diagnosed with cancer in the period of 2011–2015 from the Korea Central Cancer Registry, which is linked to the claims database of the National Health Insurance Service (n = 958,928). Results: The utilisation rate increased during the study period, from 6.0% (11,504) of 192,835 newly diagnosed patients in 2011 to 6.8% (12,455) of 183,084 newly diagnosed patients in 2015. Patients with central nervous system (28.4%) and bone (27.8%) cancer were most likely to undergo physical rehabilitation. The rehabilitation rate was higher in patients with metastatic than localised or regional cancer (8.7% vs. 5.3% vs. 5.5%). Conclusion: This claims-based study revealed that rehabilitation therapy for cancer patients is underutilised in Korea. Although patients with metastasis underwent more intensive rehabilitation than patients with early stage cancer, those without brain and bone tumours (the treatment of which is covered by insurance) were less likely to use rehabilitation services. Further efforts to improve the use of rehabilitation would improve the outcomes of cancer patients.

Prevalence of new psychoactive substances in Northeast Asia from 2007 to 2015

Lee, Junhui,Yang, Songhee,Kang, Yujin,Han, Eunyoung,Feng, Ling-Yi,Li, Jih-Heng,Chung, Heesun Elsevier Sequoia 2017 Forensic science international Vol.272 No.-

<P><B>Abstract</B></P> <P>The proliferation of new psychoactive substances (NPS) has been a global trend in drug abuse and its regulation has been a worldwide concern. There is no doubt that it is necessary to share information related to these emerging substances between countries and continents for the effective regulation of NPS. With efforts for the efficient regulation of NPS, many studies and information have been published for the prevalence of NPS in the United States and other countries in Europe and Oceania. However, there is lack of information available for the prevalence of NPS in Asian and African countries. Therefore, this research was focused on the investigation of legal status of certain NPS in Northeast Asian countries, including China, Japan, South Korea and Taiwan, in order to provide information on the prevalence and trend of emerging NPS in these countries. The results showed that a total of 940 NPS was reported in 4 Northeast Asian countries from 2007 to 2015. Among 940 NPS, 882 NPS are legally restricted in at least one country (94%) and 96 substances were not currently under control (6%) in these countries. The number of controlled NPS that are currently controlled in all 4 countries was only 25 (or 28%) out of 882 NPS. Each substance was categorized in 9 groups according to the classification proposed by the United Nations Office on Drugs and Crime (UNODC). In Northeast Asia, the most commonly controlled NPS were synthetic cannabinoids, synthetic cathinones, and phenethylamines. It was found that Japan is the most proactive country in terms of the NPS regulation with 41% of the total number of controlled NPS in Northeast Asia, followed by South Korea (21%), China (28%), Taiwan (10%). Comparing the number of NPS newly regulated in each country every year, NPS has been broadly scheduled in 2011 and the number of scheduled NPS has dramatically increased from 2013 to 2015. It was shown that Northeast Asia is also in danger of these emerging NPS and the effective regulation across countries is important for the prevention of NPS. Also, this study will bring attention to local law enforcement in the construction of local drug crime prevention network sharing information for these controlled substances.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The trend and legal status of NPS in China, Japan, Korea and Taiwan was studied. </LI> <LI> Among total of 940 NPS reported, only 25 are currently controlled in 4 countries. </LI> <LI> Japan is the most proactive country regarding the NPS regulation followed by Korea. </LI> <LI> The information on emerging NPS in four countries was conducted for the first time. </LI> </UL> </P>

연령관련황반변성 환자에서 항혈관내피성장인자의 치료 방법과 재정 영향 분석

양장미(Jangmi Yang),신상진(Sang Jin Shin),서재경(Jae Kyung Suh),조송희(Songhee Cho),최하진(Hajin Tchoe),강민주(Min Joo Kang),지동현(Donghyun Jee) 대한안과학회 2018 대한안과학회지 Vol.59 No.11

목적: 연령관련황반변성 환자에 대해 항혈관내피성장인자의 가능한 치료 방법에 따라 건강보험 재정에 미치는 영향을 분석하였다. 대상과 방법: 여러 치료 방법에 따른 건강보험 재정의 변화를 향후 5년(2018-2022년) 동안 추정하였다. 새로운 급여기준 이외 바이오시밀러 등장, 허가초과 비급여약제 사용 등을 고려한 시나리오에 대해서도 재정 영향을 분석하였다. 국민건강보험공단 청구자료 및 의료기관 자료를 기준으로 각 시나리오별로 향후 5년 동안 예상 진료환자 수, 치료 횟수를 추정하였으며, 재정부담을 추계하였다. 결과: 연령관련황반변성에서 현행의 사용형태로 기존 급여기준(평생 14회)이 유지되는 경우(시나리오 1) 2018년 기준 향후 5년간 보험소요재정은 약 4,403억 원으로 추정되었다. 2017년 12월에 변경된 급여기준하에서 5년간 보험소요재정은 약 5,601억 원으로 추정되었다. 2020년 이후 바이오시밀러 급여(시나리오 3), 현재 허가초과 비급여약제인 베바시주맙(시나리오 4)을 급여전환하는 경우에 각각 5,210억 원, 4,197억 원으로 예상되었다. 결론: 본 평생 14회라는 급여기준 삭제로 인해 건강보험 재정이 크게 증가할 것이 예상되었으나 실제 0.1 이하 그리고 반흔화/위축성병변일 경우 급여 중단 등의 새로운 기준으로 중간폭으로 증가하는 것으로 나타났다. 또한 고령화로 인한 연령관련황반변성 유병환자의 증가를 고려할 때 바이오시밀러 및 베바시주맙 도입 등의 정책적 대안도 고려할 수 있다. Purpose: To evaluate the effects of anti-vascular endothelial growth factor (VEGF) treatment on the healthcare-related finances of patients with age-related macular degeneration. Methods: Changes in health care financing due to newly introduced benefit standards were predicted over the coming 5-year period (2018-2022). We also analyzed the financial impact of scenarios in which agents similar to anti-VEGF, such as the over-licensed drug bevacizumab, were introduced. For this purpose, the future number of patients receiving anti-VEGF treatments was estimated for various scenarios based on National Health Insurance Corporation claims data followed by an estimate of the financial burden. Results: In the case of age-related macular degeneration, the current standard of care (14 times in a lifetime) was maintained in scenario 1. In 2018, the insurance budget for the coming 5-year period was estimated at approximately 440.3 billion won. The insurance cost for that period was estimated at approximately 560.1 billion won under the revised standard of December 2017 (scenario 2). For scenarios wherein, after 2020, similar treatments (scenario 3) and bevacizumab (scenario 4) were introduced, the estimated health insurance costs were 521 billion won and 419.7 billion won, respectively. Conclusions: Health insurance costs are projected to increase substantially due to the elimination of the 14 time pay standard; however, the actual budget will only moderately increase, due to new limitations of visual acuity ≤ 0.1 or in case of scarring/ atrophic lesions. Clinically similar agents and bevacizumab could be considered as alternatives to anti-VEGF treatment for age-related macular degeneration.

Synchronous Carrier-based Pulse Width Modulation Switching Method for Vienna Rectifier

Jin-Hyuk Park,SongHee Yang,Kyo-Beum Lee 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This paper proposes a synchronous switching technique for a Vienna rectifier that uses carrier-based pulse width modulation (CB-PWM). A three-phase Vienna rectifier, similar to a three-level T-type converter with three back-to-back switches, is used as a PWM rectifier. Conventional CB-PWM requires six independent gate signals to operate back-to-back switches. When internal switches are operated synchronously, only three independent gate signals are required, which simplifies the construction of gate driver circuits. However, with this method, total harmonic distortion of the input current is higher than that with conventional CB-PWM switching. A reactive current injection technique is proposed to improve current distortion. The performance of the proposed synchronous switching method and the effectiveness of the reactive current injection technique are verified using simulations and experiments performed with a set of Vienna rectifiers rated at 5 kW.

Synchronous Carrier-based Pulse Width Modulation Switching Method for Vienna Rectifier

Park, Jin-Hyuk,Yang, SongHee,Lee, Kyo-Beum The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This paper proposes a synchronous switching technique for a Vienna rectifier that uses carrier-based pulse width modulation (CB-PWM). A three-phase Vienna rectifier, similar to a three-level T-type converter with three back-to-back switches, is used as a PWM rectifier. Conventional CB-PWM requires six independent gate signals to operate back-to-back switches. When internal switches are operated synchronously, only three independent gate signals are required, which simplifies the construction of gate driver circuits. However, with this method, total harmonic distortion of the input current is higher than that with conventional CB-PWM switching. A reactive current injection technique is proposed to improve current distortion. The performance of the proposed synchronous switching method and the effectiveness of the reactive current injection technique are verified using simulations and experiments performed with a set of Vienna rectifiers rated at 5 kW.

4주 유산소 운동의 운동강도가 노령 생쥐의 심혈관질환위험인자, 활성산소, 항산화효소에 미치는 효과

김지현(Kim Ji Hyun),전송희(Jeon Songhee),정하진(Jeong Ha Jin),전미양(Jeon Mi Yang) 한국기초간호학회 2020 Journal of korean biological nursing science Vol.22 No.2

Purpose: The purpose of this study was to determine the effects of different intensity of aerobic exercise for four weeks on cardiovascular risk factors, reactive oxygen, and antioxidant enzymes in old mice. Methods: Eighteen male C57BL/6 mice age 18 months were randomly classified into the control group (n=6), the moderate intensity exercise group (n=6), and the low intensity exercise group (n=6). The training groups performed the aerobic exercise twice daily for 20 minutes, five days weekly for four weeks. Data were analyzed using descriptive statistics, analysis of variance (ANOVA), the Chi-square test, and the Tukey’s test with the SPSSWIN 21.0 program. Results: In this study, among the risk factors of cardiovascular disease, blood sugar (BS) (p=.023) and total cholesterol (TC) (p=.001) were significantly different between the moderate intensity exercise group and the control group. Additionally, there were significant differences in the reactive oxygen malondialdehyde (MDA) (p=.001), the antioxidant enzymes superoxide dismutase (SOD) (p<.001) and glutathione reductase (GR) (p=.015) between the moderate intensity exercise group and the control group. Conclusion: This finding suggests that moderate intensity aerobic exercise promotes the activity of antioxidant enzymes and lowers cardiovascular risk factors in older mice.

폐수의 급속응집을 위한 하이드로싸이클론 최적설계

연익준(Ikjun Yeon),이준호(Junho Lee),김송희(Songhee Kim),김규형(Gyuhyeong Kim),송대현(Daehyeon Song),양승호(Seungho Yang) 대한환경공학회 2020 대한환경공학회 학술발표논문집 Vol.2020 No.11