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Suhyun Hwang,Subin Bae,Shintae Kim,Jeongjin Park,Yoo-Hyun Lee,Woojin Jun 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Non-alcholic fatty liver disease (NAFLD) is a disorder characterized by excessive accumulation of lipids in the liver without alcohol consumption. It is considered to be exacerbated from simple steatosis to fibrosis by many factors including oxidative stress, lipotoxicity, and insulin resistance. Phlomis umbrosa TURCZ. (PU) was proved their biological activities such as antioxidant, anti-inflammatory, anti-viral, and anti-osteoporosis. However, the mechanism and effect on hepatic steatosis has not been elucidated. The aim of this study is that investigated the potential of water extracts of PU (PUW) to modulate lipid accumulation and oxidative stress in NAFLD. The antioxidant activities of the PUW was measured by total phenolic compounds, flavonoid contents, DPPH, and ABTS radical scavenging activities. As a result of examining the degree of lipid accumulation in HepG2 cells induced by free fatty acids through AdipoRed, the PUW treatment group showed a significant decrease. It is thought that PUW may improve NAFLD by increasing antioxidant activity and reducing lipid accumulation.
Secure Multicast using Proxy Re-Encryption in an IoT Environment
( Suhyun Kim ),( Yongwoon Hwang ),( Jungtaek Seo ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.2
Recently interest in Internet of Things(IoT) has attracted significant attention at national level. IoT can create new services as a technology to exchange data through connections among a huge number of objects around the user. Data communication between objects provides not only information collected in the surrounding environment but also various personalized information. IoT services which provide these various types of data are exposed to numerous security vulnerabilities. If data is maliciously collected and used by an attacker in an IoT environment that deals with various data, security threats are greater than those in existing network environments. Therefore, security of all data exchanged in the IoT environment is essential. However, lightweight terminal devices used in the IoT environment are not suitable for applying the existing encryption algorithm. In addition, IoT networks consisting of many sensors require group communication. Therefore, this paper proposes a secure multicast scheme using the proxy re-encryption method based on Vehicular ad-hoc networks(VANET) environment. The proposed method is suitable for a large-scale dynamic IoT network environment using unreliable servers.
( Suhyun Shim ),( Mee-ran Kim ),( Hyejin Hwang ),( Youngsin Han ),( Youn-jee Chung ),( Hyun-hee Cho ),( Hyun-kyung Kim ),( Minkyoung Lee ),( Mira Kim ),( Chai-young Jung ),( Kyung-hee Chae ),( Sukil K 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: The prevalence and incidence of endometriosis are estimated highly varied according to several study. Until now, the overall prevalence is known about 10% in reproductive-age women and up to 50% of symptomatic women with infertility or pain in high-risk population. in addition, there are few studies about nationwide epidemiological data in korea. Therefore reliable estimation of prevalence and incidence of endometriosis in korea remain unclear. Methods: This study is using administrative data provided by the Korean National Health Insurance Service (NHIS). These data from overall Korean population, totaling 45 million people, with national claims data for the period from January 1, 2002, to December 31, 2016. We selected patients with endometriosis as primary or secondary diagnosis code from the NHIS database and estimated prevalence and incidence rate of endometriosis according to time and age group. The diagnoses of endometriosis were identified by ICD-10 codes N80, except adenomyosis (N80.0). Results: Among women aged 11- 55 selected from the NHIS database from 2002 to 2016, 212,509 women were diagnosed as endometriosis. The incidence of endometriosis was increased 1.94 per 1000 person in 2002 to 1.82 per 1000 person in 2016. The overall prevalence of endometriosis was increased from 1.9 per 1000 person in 2002 to 4.0 per 1000 women in 2016. The prevalence increased gradually except 2007 to 2008. Conclusion: We found a significant trend of increase in diagnosing endometriosis in Korean women with time, although prevalence was decline in 2007 to 2008. We presume that this declination was a result of restructuring the diagnostic code at that time. Considering that endometriosis is associated with subfertility and has high incidence rate in young age in Korean women, it is very important to detect and treat endometriosis earlier.
Hwang-Jae Lee,Suhyun Lee,Won Hyuk Chang,Keehong Seo,Youngbo Shim,Byung-Ok Choi,Gyu-Ha Ryu,Yun-Hee Kim IEEE 2017 IEEE transactions on neural systems and rehabilita Vol.25 No.9
<P>The aims of this paper were to investigate the effectiveness of a newly developed wearable hip assist robot, that uses an active assist algorithm to improve gait function, muscle effort, and cardiopulmonary metabolic efficiency in elderly adults. Thirty elderly adults (15 males/ 15 females) participated in thispaper. The experimental protocol consisted of overground gait at comfortable speed under three different conditions: free gait without robot assistance, robot-assisted gait with zero torque (RAG-Z), and full RAG. Under all conditions, muscle effort was analyzed using a 12-channel surface electromyography system. Spatio-temporal data were collected at 120 Hz using a 3-D motion capture system with six infrared cameras. Metabolic cost parameters were collected as oxygen consumption per unit (ml/min/kg) and aerobic energy expenditure (Kcal/min). In the RAG condition, participants demonstrated improved gait function, decreased muscle effort, and reduced metabolic cost. Although the hip assist robot only provides assistance at the hip joint, our results demonstrated a clear reduction in knee and ankle muscle activity in addition to decreased hip flexor and extensor activity. Our findings suggest that this robot has the potential to improve stabilization of the trunk during walking in elderly adults.</P>
김수현(SUHYUN KIM),양재호(JAEHOO YANG),박세라(SERA PARK),김수완(SUWAN KIM),황충구(CHOONGGU HWANG),이개명(GAEMYOUNG LEE) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.10
풍력발전과 태양광발전 등의 신재생에너지원에 의한 발전은 전력소비가 증가할 때 전력공급자가 요청한다고 발전을 할 수 있는 것은 아니다. 전력소비가 피크에 있을 때 신재생에너지원에 의한 발전소가 어느정도 출력을 내는 지는 중요한 요소이다. 우리나라의 경우 태양광발전소는 하계 전력피크타임에 가동률이 높기 때문에 다른 신재생에너지원에 의한 발전보다 하계피크전력 공급에 기여도가 크다. 본 연구에서는 제주도에 건설되어 있는 1MW급 태양광발전소의 전국과 제주지역 하계 전력피크타임 일에 전력공급 기여도를 분석하고, 한국전력(주)에서 제공하는 전기요금제의 계절별 시간대별 구분표의 구분에 따른 전력공급 기여도를 분석하고자 한다.