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Antioxidant Activities and Total Phenolic Contents of Three Legumes
이경준(Kyung Jun Lee),김가희(Ga-Hee Kim),이기안(Gi-An Lee),이정로(Jung-Ro Lee),조규택(Gyu-Taek Cho),마경호(Kyung-Ho Ma),이수경(Sookyeong Lee) 한국자원식물학회 2021 한국자원식물학회지 Vol.34 No.6
Legumes have been important components of the human diet. They contain not only protein, starch, and dietary fiber, but also various phenolic compounds such as flavonoids and phenolic acids. The importance of phenolic compounds to human health is well known due to their antioxidant activities. In this study, three legumes (adzuki beans, common beans, and black soybeans) frequently cultivated in Korea were evaluated for their total phenolic content (TPC) and antioxidant activities using DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS (2,2′-azinobis (3-ethylbenzothiazoline 6-sulfonate)), and FRAP (ferric reducing antioxidant potential) assays. In addition, correlations between agricultural traits and antioxidant activities of these three legumes were analyzed. Antioxidant activities assessed by DPPH, ABTS, and FRAP assays and TPC showed wide variations among legumes types and accessions. Among the three legumes, adzuki beans showed higher TPC and antioxidant activity than the other two legumes. In correlation analysis, seed size showed negative correlations with antioxidant activities and TPC. In principal component analysis and hierarchical clustering analysis, each of the three legumes was clearly separate. Results of this study can be used as basic information for developing functional materials for each legume. They can also help us understand the overall antioxidant activity of the three legumes.
이경준(Kyung-Jun Lee),서덕영(Doug-Young Suh) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
There are variable unexpectable errors because of wireless channel which is different from wired channel. In order to distinguish various error factor, this paper is proposed to use Mac parameters. Mac Parameter is able to distinguish channel states such as interference, congestion, signal decrement.
이경준(Kyung-Jun Lee),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.11
This paper describes the design of a four-axis force/torque sensor with PSPBs (Parallel Step Plate Beams). The sensor is composed of eight PSPBs, a force/torque transmitting block, and fixing blocks. It is designed by using the FEM(Finite Element Method), and fabricated by using strain gages. The characteristic tests of the sensor are carried out, and the interference error, repeatability error, and non-linearity error are less than 2.21%, 0.03% and 0.03%. Furthermore, the structure of the four-axis force/torque sensor with PSPBs has a larger rated capacity than that of the four-axis force/torque sensor with PPBs under the same overall sensor size and the same rated output. It is thought that the developed four-axis force/torque sensor with PSPBs can be used for measuring the forces and torques in an intelligent robot, automation devices, etc.
변분 원리를 응용한 타에 부착된 Post-Swirl Fin의 최적 설계에 관한 연구
이경준(Kyung-Jun Lee),호시노(Tetsuji Hoshino),이진석(Jin-Suk Lee),오세면(Se-Myun Oh),박형길(Hyung-Gil Park) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
This study treats an application of variational principle to the design of post swirl fins which develop additional thrust from propeller slip stream. The design problem is formulated with the vortex lattice lifting line representation of the components so that the power absorbed by a propeller is minimized with the thrust generated by the propeller and fin given by a prescribed value. The optimum circulation distribution of each component is determined by solving a resulting discrete variational problem. The interactions between the two components are considered in circumferentially averaged velocity field calculation at one component location induced by the other one. The procedure is first applied to the determination of the optimum single propeller loading distribution and compared with the Lerbs solution in open water configuration. The developed method is then applied to the design of the propeller and post-swirl fins attached to rudder for a VLCC. To verify the velocity field calculations, flow measurement is conducted behind a propeller. Finally self propulsion tests are carried out to estimate the efficiency increase by the fins. The result proves the validity of the design procedure.
이경준(Kyung-Jun Lee),김현민(Hyeon-Min Kim),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.3
This paper describes the design of a smart three-axis force sensor for measuring forces Fx, Fy and Fz. The smart three-axis force sensor is composed of a three-axis force sensor, a force-measuring device, housing and a cover, where the three-axis force sensor and the force-measuring device are inside the housing and the cover. The measuring device measures forces Fx, Fy and Fz from the three-axis force sensor, and calculates the resultant force using the measured forces, and then sends the resultant force and forces to a PC or other controller using RS-485 communication. The repeatability error and the non-linearity error of the smart threeaxis force sensor are less than 0.03%, and the interference error of the sensor is less than 0.87%. It is thought that the sensor can be used for measuring forces in a robot, automatic systems and so on.
가전제품 조작부에서의 멀티모달 피드백에 대한 반응 시간 및 과업 부하 평가
이경준(Kyung-Jun Lee),이유신(Yushin Lee),이중희(Joog Hee Lee),윤명환(Myung Hwan Yun) 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1
멀티모달 피드백은 두 가지 이상의 자극을 통해 높은 직관성과 자연스러움을 제공할 수 있는 유니버설 디자인의 기본 요소이다. 이 멀티모달 피드백은 가전제품 조작 시에도 조작부나 스마트폰을 통해 제공된다. 그러나 다양한 채널을 통해 지속적인 피드백을 제공하면 사용자의 인지에 부담을 주고 제품의 선호에 영향을 수 있다. 따라서 본 연구에서는 가전 제품을 사용할 때 제공되는 멀티모달 피드백의 영향을 스마트폰을 통해 살펴보았다. 실험을 통해 피실험자에게 시각, 청각 및 촉각 자극을 결합한 피드백을 제공하여 자극 조합에 따라 반응 시간과 작업 부하 및 선호도 변화를 확인하였다. 실험결과에서, 피드백의 조합에 따라 과업 수행 시간에는 유의한 차이가 없었으나 선호도, 주의 필요성 및 편의성에서는 차이가 나타났다. 특히 시각적, 촉각적 및 청각적 조합을 결합한 피드백보다 시각 및 촉각 피드백 만 결합하는 피드백이 더 바람직하다고 응답되었다. 이러한 통해 가전 제품에 대한 제어피드백을 설계 할 때 단일 자극보다는 다중 자극을 제공하는 것이 더 좋지만, 적절한 피드백 제공을 위해 자극의 숫자와 유형을 선택하는 과정이 필요하다는 것을 확인할 수 있었다.
고속 움직임 예측을 위한 움직임 적응적 손실성 엄격 다단계 연속 제거 알고리즘
이경준(Lee, Kyung-Jun),Ng Teck Sheng,유종상(Yoo, Jong-Sang),정제창(Jeong, Je-Chang) 한국방송·미디어공학회 2012 한국방송공학회 학술발표대회 논문집 Vol.2012 No.11
본 논문에서는 고속 움직임 예측(Fast Motion Estimation)방법의 일종인 다단계 연속 제거 알고리즘(MSEA : Multi-level Successive Elimination Algorithm)에 움직임의 역동성 정도를 고려하여 적응적인 가중치를 적용하는 방안에 대해 제안하였다. 움직임을 예측하는 과정에서 영상의 화질 손상이 발생하는 방식(Lossy Motion Estimation Algorithm)에서 모든 단위 블록(Macro Block)에 고정된 가중치만을 적용하는 기존의 방식과 달리 주위 블록의 움직임 벡터(Motion Vector)를 통해 움직임의 정도를 가정하여 적응적인 가중치를 적용함으로써 화질 손상을 줄이는 것이 목적이다. 제안하는 알고리즘으로 설계한 실험으로부터 MSEA에 적응적 가중치를 사용할 경우의 효율성을 확인하였다.