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미래의 스펙트럼 관리 정책과 동적 스펙트럼 관리 기술이 나아가야 할 방향
전형석,이혁재,Jeon, Hyeong-Seok,Lee, Hyeok-Jae 한국통신학회 2007 정보와 통신 Vol.24 No.9
이동통신관련 산업이 발전함에 따라 전파 자원의 수요가 급증하여 스펙트럼의 경제적 가치는 계속적으로 높아지고 있다. 따라서 기존의 명령과 통제에 의한 정부의 일방적인 주파수 할당 방식에서 벗어나 시장원리를 도입함으로써 주파수의 활용을 극대할 필요성이 제기 되고 있다. 나라마다 조금씩의 차이는 있지만 주요 내용은 스펙트럼을 거래 가능한 재화로 취급하여 시장원리에 따라 스펙트럼을 관리하려는 것과 스펙트럼 접속 에티켓(etiquette)을 바탕으로 모두가 스펙트럼을 공유하는 관리 방식이 그것이다. 본 원고는 이러한 정책 흐름의 변화 과정 속에서 현재 국내외 주파수 정책의 최신 동향을 살펴보고 이를 분류하고 필요한 정책적, 기술적 과제를 살펴봄으로써 동적 스펙트럼 관리 기술 및 비즈니스 모델 개발의 가이드라인을 제공하고자 한다.
Predicting Attention and Memory Ability based on the Combination of EEG and HRV data in Children
전형석(Hyeong Seok Jeon),이준희(Junhee Lee),이준(June Lee),황유진(You Jin Hwang),이시영(Siyoung Lee),양희(Hee Yang),윤정한(Jung Han Yoon),권준수(Jun Soo Kwon),원중호(Jung Ho Won),조준동(Jun Dong Cho),이기원(Ki Won Lee) 한국교원대학교 뇌기반교육연구소 2019 Brain, Digital, & Learning Vol.9 No.3
Good performance is important element not only in workplace but also in daily activities. Performance of the human depends on the mental capacity and mental workload. Especially, children in concrete operational stage is critical for further learning ability that they develop their ability to distinguish between quality and quantity. However, the reason that mental workload is difficult to quantify through physiological measures, makes it more complicated to demonstrate the mental workload. When it comes to children’s development, physical change is visible and easy to identify but mental change is not. HRV is relatively easy to measure but has limitation because it is indirect way of measuring brain signal. Above all things, many researches of real-time indicator measuring physiological data such as heart rate variability (HRV) have been done sporadically but not integrated. Therefore, In this study we tried to demonstrate if we can predict the mental capacity not mental workload with the EEG. Attention ability was measured with Stroop task, and memory ability was measured with digit span task. The main outcome of this study is that building predictive models for cognitive functions using physiological measures is feasible and that its predictive models for cognitive functions using physiological measures is feasible and that its predictive power is further improved when EEG is used along with HRV data. It is implied form the outcome of study that combining physiological measures may improve its predictive power by improving the signal relative to noises and that future studies may focus on discovery of further biomarkers for prediction of cognitive functions.
순응형 파지와 정밀한 집기가 가능한 유연한 그리퍼의 강도 및 강성 분석
이덕원(Deok Won Lee),전형석(Hyeong Seok Jeon),정용준(Young Jun Jeong),김용재(Yong Jae Kim) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.10
In this paper, we introduce a flexible gripper that we have engineered to precisely pinch in parallel and compliantly grasp objects. As found in most conventional industrial grippers, the parallel pinching property is essential for precise manipulation. On the other hand, the grippers with a flexible structure are more adept at grasping objects with arbitrary shapes and softness. To achieve these disparate properties, we introduce a flexible gripper mechanism composed of multiple flexible beam structures. Utilizing these beam structures, the proposed gripper is able to grasp arbitrarily shaped objects. Additionally, a unique combination of flexible beams enables the gripper to pinch objects using the parallel fingertips for enhanced precision. A detailed description of the proposed mechanism is provided, and an analysis of the strength and stiffness of the fingertip and finger body is presented. The Results section compares the theoretical and experimental analyses and verifies the properties and performance of the proposed gripper.
높은 파지력을 가지며 촉감을 전달할 수 있는 유연한 글러브
정용준(Yong-Jun Jeong),김종인(Jong-In Kim),전형석(Hyeong-Seok Jeon),이덕원(Deok-Won Lee),김용재(Yong-Jae Kim) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.12
This paper introduces a tactilely transparent soft glove composed of soft materials and flexible structures. Although it is hard to achieve a high grasping force with conventional grip-assist gloves made from soft material, the proposed glove can exert a high force by using a novel structure. This structure has a triangular shape composed of flexible structural frames, soft fabric, and belts. It can produce grip-assist moment compliantly without harmful force or misalignment with the human fingers. The whole finger part that comes into contact with objects is made of thin and soft fabric in order to facilitate sensation transference. The proposed tactilely transparent soft glove enables the user to manipulate various objects owing to both the softness and high grasping force; it helps lifting heavy weight objects as well as permitting delicate tactile feeling on the palm and fingers. The proposed concept was applied to a two-finger grip-assist device for validation. In addition, the experimental results regarding grasping objects, fingertip force, and grasping force are presented.