• Journal of Nutrition and Health
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• 제46권5호
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• pp.401-409
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• 2013

본 연구에서 SCLE와 그 분획의 총 폴리페놀과 플라보노이드의 함량을 측정한 결과 SCLE/EA에서 가장 많은 함량이 확인되었으며, DPPH 및 ABTS radical scavenging activity, SOD-like activity, reducing power 측정을 통한 항산화 활성을 비교한 결과도 폴리페놀과 플라보노이드함량 측정 결과와 마찬가지로 SCLE/EA에서 높은 활성을 명확하게 확인할 수 있었다. 그리고 SCLE 및 분획의 항당뇨 효능을 ${\alpha}$-glucosidase 활성억제능을 측정함으로써 비교한 결과 항산화력과 달리 SCLE/BuOH에서 가장 높은 활성을 확인할 수 있었으며, 1 mg/mL 기준으로 acarbose의 ${\alpha}$-glucosidase 활성억제능과 비교하여 2배 이상의 활성을 관찰할 수 있었다. 또한 당뇨와 비만의 강한 관련성이 알려진 상황에서 SCLE 및 그 분획의 3T3-L1 세포 분화 억제능력을 확인한 결과 SCLE와 SCLE/FW에서 가장 강한 억제효과를 확인할 수 있었다. 본 연구를 통해 SCLE가 다방면에서 당뇨의 개선과 예방을 위해 효능을 나타낼 수 있음을 확인하였고, 이는 SCLE가 neutraceuticals 소재로서의 개발가치가 높음을 시사한다.

• 비교문화연구
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• 제52권
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• pp.1-29
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• 2018

'선물'은 서양 문화의 이해에서 핵심적인 코드 중 하나이다. 이 글에서는 선물에 대한 연구에서 혁혁한 업적을 남긴 모스, 데리다, 리쾨르의 선물론을 비교, 분석함으로써, 선물 자체에 대한 이해와 이 개념과 밀접하게 관련이 있는 '용서' 개념의 이해를 위한 초석을 놓고자 한다. 모스에 따르면 선물은 없다. 선물은 주는 것, 받는 것, 갚는 것이라는 세 가지 의무의 지배를 받는 경제적 교환으로 이해된다. 다만 모스는 주는 것이 의무라는 점에 주목하면서 도덕 정립의 가능성을 제시한다. 데리다는 이론적으로 선물 이해의 폭을 최대한 확장시키고 있다. '시간'이라는 요소에 주목하면서 선물은 찰나적으로만 존재하고, 시간이 지나면 결국 경제적 교환이 되고 만다는 점, 곧 선물의 아포리아를 지적한다. 리쾨르는 선물 개념에 적용되는 등가성의 논리와 이를 바탕으로 이루어지는 '정의'를 벗어나 넘침의 논리에 입각한 '사랑'과 '초윤리' 정립의 가능성을 제시한다. 리쾨르는 또한 이런 선물 개념을 토대로 '용서' 개념을 제시함으로써 다수의 인간들이 살아가고 있는 이 세상에서 윤리가 힘을 얻고, 도덕과 인간성이 회복되는 사회를 지향하는 기획에의 동참을 촉구하고 있다.

• Archives of Plastic Surgery
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• 제45권6호
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• pp.598.1-598.1
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• 2018

• 대한수학회지
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• 제36권1호
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• pp.125-137
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• 1999

Under the condition of RicM $\geq$ -(n-1), injM $\geq$ I0, we prove the existence of an $\varepsilon$>0 such that on the region of volume $\varepsilon$>0 the curvature condition of splitting theorem can be weakened.

• 대한소아치과학회지
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• 제39권3호
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• pp.325-331
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• 2012

국내 의학 데이터베이스는 주관기관에 따라 다양하다. 국내 주요 의학 데이터베이스로는 대한의학회 산하 대한의학학술지 편집인협의회(KAMJE)의 KoreaMed, KoMCI, Synapse, 국가 주도의 의학연구정보센터(MedRIC)의 KMbase, 한국교육학술정보원(KERIS)의 RISS, 한국과학기술정보연구원(KISTI)의 NDSL, 한국연구재단(NRF)의 KCI가 있다. 민간 유료데이터베이스로는 한국학술정보의 KISS, 누리미디어의 DBpia가 있으며, 포털사이트인 Google과 Naver도 방대한 양의 정보를 제공하고 있다.

• 한국수소및신에너지학회논문집
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• 제25권3호
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• pp.311-318
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• 2014

Performance degradation of a battery in 20 kWh energy storage system (ESS) under various operating conditions was studied. And energy saving of the ESS was also monitored by connecting with 20 kW photovoltaic (PV). PV-connected ESS saved 5~7% of energy consumption in 2013 compared to that without such system in 2012. As charge-discharge cycle increased, capacity decreased and the performance degradation was glaringly obvious after 40 cycles. And as charge and discharge rate increased, the performance degradation was more serious. After 50 charge-discharge cycles, a lot of degraded product was deposited on the surface of anode and cathode electrodes, and the cathode side was more contaminated. Therefore, in order to maintain the cell performance, it was more important to protect the degradation of the cathode side.

• 대한수학회보
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• 제52권5호
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• pp.1535-1547
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• 2015

A vector field on a Riemannian manifold (M, g) is called concircular if it satisfies ${\nabla}X^v={\mu}X$ for any vector X tangent to M, where ${\nabla}$ is the Levi-Civita connection and ${\mu}$ is a non-trivial function on M. A smooth vector field ${\xi}$ on a Riemannian manifold (M, g) is said to define a Ricci soliton if it satisfies the following Ricci soliton equation: $$\frac{1}{2}L_{\xi}g+Ric={\lambda}g$$, where $L_{\xi}g$ is the Lie-derivative of the metric tensor g with respect to ${\xi}$, Ric is the Ricci tensor of (M, g) and ${\lambda}$ is a constant. A Ricci soliton (M, g, ${\xi}$, ${\lambda}$) on a Riemannian manifold (M, g) is said to have concircular potential field if its potential field is a concircular vector field. In the first part of this paper we determine Riemannian manifolds which admit a concircular vector field. In the second part we classify Ricci solitons with concircular potential field. In the last part we prove some important properties of Ricci solitons on submanifolds of a Riemannian manifold equipped with a concircular vector field.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.580-585
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• 2005

A QRT(Quad-Rotor Type) hovering robot system is developed for quick detection and observation of the circumstances under calamity environment such as indoor fire spots. The UAV(Unmanned Aerial Vehicle) is equipped with four propellers driven by each electric motor, an embedded controller using a DSP, INS(Inertial Navigation System) using 3-axis rate gyros, a CCD camera with wireless communication transmitter for observation, and an ultrasonic range sensor for height control. The developed hovering robot shows stable flying performances under the adoption of RIC(Robust Internal-loop Compensator) based disturbance compensation and the vision based localization method. The UAV can also avoid obstacles using eight IR and four ultrasonic range sensors. The VTOL(Vertical Take-Off and Landing) flying object flies into indoor fire spots and sends the images captured by the CCD camera to the operator. This kind of small-sized UAV can be widely used in various calamity observation fields without danger of human beings under harmful environment.

• Journal of Power Electronics
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• 제12권2호
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• pp.317-325
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• 2012

Resonant immittance converter (RIC) topologies can transform a current source into a voltage source (Type-I RICs) and vice versa (Type-II RICs), thereby making them suitable for many power electronics applications. RICs are operated at a fixed frequency where the resonant immittance network (RIN) exhibits immittance conversion characteristics. It is observed that the low-frequency response of Type-II RINs is relatively flat and that the state variables associated with Type-II RINs affect the response only at the high frequencies in the vicinity of the switching frequency. The overall response of a Type-II RIC is thus dominated by the filter response, which is particularly important for the controller design. Therefore, an approximate equivalent circuit model and a small-signal model of Type-II RICs are proposed in this paper, neglecting the high-frequency response of Type-II RINs. While the proposed models greatly simplify and speed-up the analysis, it adequately predicts the open-loop transient and small-signal ac behavior of Type-II RICs. The validity of the proposed models is confirmed by comparisons of their results with those obtained from a cycle-by-cycle simulation and with an experimental prototype.

• 한국산업보건학회지
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• 제29권4호
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• pp.562-570
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• 2019

Objectives: Rapid Intervention Crews (RIC) are indispensable for rescuing firefighters who are lost or trapped. They are included in Disaster Scene Standard Operating Procedures. This study was conducted to examine the use of RIC at emergency scenes in South Korea. Methods: We conducted a nationwide survey of 4,913 firefighters in South Korea. The firefighters' experiences of use of RICs were assessed by asking, "How often are RICs available at fires?" Results: A full 40.8% of firefighters answered that they 'never' have RICs available at fires. Another 8.4% responded that they 'always' have RICs available, which is much lower than the rate among US firefighters (19.9%). RICs are available more often for firefighters in the capital area than for firefighters outside the capital area (13.4% vs. 5.1%, p<0.001). The larger the jurisdiction served, the more likely the firefighters were to have RICs available (p<0.001). Conclusions: These results imply that firefighters in South Korea are at risk. It is necessary to recruit personnel to improve the use of RICs and to explicitly include RICs in SOPs, training, and business plans.