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          다중 셀 네트워크에서 다중 D2D 통신 자원할당 기법

          김현민(Hyeon-Min Kim), 강길모(Gil-Mo Kang), 신오순(Oh-Soon Shin) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.9

          셀룰러 네트워크 환경에서 단말 간 직접통신(D2D : Device-to-Device)을 위해서는 기존의 셀룰러 링크의 성능을 보장함과 동시에 D2D 통신 링크의 성능을 극대화하는 것이 중요하다. 따라서 D2D 통신에 사용할 자원을 할당함에 있어 D2D 송신 단말이 셀룰러 시스템에 미치는 간섭과 셀룰러 시스템이 D2D 수신 단말에 주는 간섭을 동시에 고려해야 한다. 본 논문에서는 D2D 송신기와 수신기로 이루어진 D2D 링크가 셀룰러 시스템의 상향링크 자원을 공유하는 상황에서 복수의 D2D 링크에 효과적으로 자원을 할당하는 기법을 제안한다. 기지국은 인접 셀의 기지국과 정보 교환을 통해 셀 내의 단말들의 위치 정보를 공유한다는 가정 하에 단말들의 단말 위치 정보를 이용하여 D2D 링크와 셀룰러 링크 사이의 간섭을 최소화하는 자원을 할당한다. 아울러 경로손실 모델을 이용하여 계산한 셀룰러 링크 보호 상수 및 D2D 링크 보호 상수를 이용하여 셀룰러 링크와 D2D 링크 상호간의 간섭 및 D2D 링크 간의 간섭을 제한한다. 모의실험을 통해 제안한 자원할당 기법의 성능을 검증한다. In D2D communications underlaying a multicell network, it is of primary importance to ensure coexistence of cellular links and D2D links with minimal interference. Therefore, resource allocation scheme for D2D links should be designed to limit the interference between cellular links and D2D links. In this paper, we propose an effective resource allocation scheme for multiple D2D links which share the uplink spectrum resource with cellular users in a multicell network. Under the assumption that the locations of users are known to the base station, the proposed scheme allocates cellular resources to D2D links, such that the interference between a cellular link and multiple D2D links is minimized. In particular, we compute two constants from the path loss model and then use the constants to protect both cellular and D2D links. Simulation results are provided to verify the performance of the proposed scheme.

        • KCI등재

          손가락 재활로봇의 5축 힘/모멘트센서를 이용한 손 누름제어

          김현민 ( Hyeon Min Kim ), 김갑순 ( Gab Soon Kim ) 한국센서학회 2012 센서학회지 Vol.21 No.3

          This paper describes the control of the hand fixing system attached to the finger rehabilitation robot for the rehabilitation exercise of patient`s fingers. The finger rehabilitation robot is used to exercise the finger rehabilitation, and a patient`s hand is safely fixed using the hand fixing system. In this paper, the hand fixing system was controlled with PD gains to fix a palm of the hand, and the characteristic test for the hand fixing system was carried out to sense the fixed hand movement of the front and the rear, that of the left and the right, and that of the upper. It is thought that the hand fixing system could safely fix the hand, and the movement of the fixed hand could be perceived using the five-axis force/moment sensor attached to the hand fixing system.

        • KCI등재

          뇌졸중환자를 위한 직교형 4개 손가락 재활로봇 기구설계

          김현민(Hyeon-Min Kim), 김갑순(Gab-Soon Kim) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.5

          This paper describes the design of a rectangular-type four-finger rehabilitation robot for flexibility rehabilitation of stroke patients" fingers and other patient's paralyzed fingers. The four-finger rehabilitation robot is composed of a body and each finger rehabilitation robot instrument. The four-finger rehabilitation robot could exercise four fingers (forefinger, middle finger ring finger and little finger) of patient for their rehabilitation. The four-finger rehabilitation robot instruments move according to the trace which spread out the patient's fingers and then turn them inward for the fingers' flexibility, while at the same time performing the force control with the reference forces for fingers' safety, simultaneously. A control characteristic test of the developed rectangular-type four-finger rehabilitation robot was carried out, and the results confirmed that the robot could be used for the flexibility rehabilitation exercise for the fingers of normal person and patients.

        • KCI등재
        • KCI등재

          흑목이 버섯 열수추출 다당의 성분 및 구조적 특성

          김현민(Hyeon-Min Kim), 허원(Won Hur), 이신영(Shin-Young Lee) 한국생물공학회 2009 KSBB Journal Vol.24 No.6

          A hot-water extract from fruit body of Auricularia auricula was purified by ethanol precipitation and subsequent dialysis. The polysaccharide showed a typical IR spectrum similar to β-glucan and was composed of glucose and mannose in a molar ratio of 16.8:83.2 indicating that it is a glucomannan. A glucomannan-like polysaccharide was also identified from Tremella fuciformis. Both of the polysaccahrides showed the presence of acetyl groups and presented colorimetric responses for β-1,4-glucomannan indicating the acetylated β-glucomannan similar to the typical polysaccharide found in Aloes.

        • KCI등재

          흰목이와 흑목이 버섯의 다당추출 및 유리라디칼 소거활성 비교

          김현민 ( Hyeon Min Kim ), 허원 ( Won Hur ), 이신영 ( Shin Young Lee ) 한국산업식품공학회 2011 산업 식품공학 Vol.15 No.1

          The polysaccharides from fruit body of Auricularia auricula and Tremella fuciformis were extracted using hot water, and partially purified through ethanol precipitation and dialysis. Free radical scavenging activities of the crude and purified polysaccharides were examined and compared each other. Free radical scavenging activities of the partially purified polysaccharides were higher than those of crude polysaccharides. DPPH free radical, ABTS radical and SOD-like activities of partially purified polysaccharide at 1 mg/mL of concentration from A. auricula were 61.7, 9.6 and 38.9%, respectively, while those of T. fuciformis were 9.6, 5.7 and 15.3%, respectively. Results of site and nonsite specific hydroxyl radical scavenging activities indicated that the partially purified polysaccharide fractions from A. auricula and T. fuciformis exhibited the hydroxyl radical scavenging effect by hydrogen donating ability and iron ion chelating ability. Also, reducing powers of A. auricula and T. fuciformis were 77.1 and 14.7% of BHT (0.1%) as standard, respectively. It was suggested that antioxidant activities of A. auricula were about 1.4~6.4 times higher than those of T. fuciformis due to different levels of polyphenol content.

        • KCI등재

          3축 힘센서를 이용한 구물체 잡기 손가락 힘측정시스템 개발

          김현민 ( Hyeon Min Kim ), 김갑순 ( Gab Soon Kim ) 한국센서학회 2010 센서학회지 Vol.19 No.3

          Stroke patients can`t use their hands because of the paralysis of their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by grasping a spherical object. At present, the object used in hospital is only a spherical object, and can`t measure the force of fingers. Therefore, doctors judge the rehabilitating extent by touching and watching at their fingers. So, the spherical object measuring system which can measure the force of their fingers should be developed. In this paper, the finger-force measuring system with a three-axis force sensor which can measure the spherical-object grasping force is developed. The three-axis force sensor is designed and fabricated, and the force measuring device is designed and manufactured using DSP(digital signal processing). Also, the grasping force test of men is performed using the developed finger-force measuring system, it was confirmed that the average force of men was about 120 N.

        • KCI등재

          손가락환자를 위한 링크형 엄지손가락 재활로봇 설계

          김현민(Hyeon Min Kim), 김갑순(Gab Soon Kim) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.7

          Rehabilitation of finger patients requires that the patients exercise their hands and fingers for proper functioning to return. A thumb rehabilitation robot, equipped with a two-axis force sensor, can prevent injury to the thumb by monitoring the applied pulling force. In this paper, we describe a link-type thumb rehabilitation robot designed for patients" thumb rehabilitation exercise. Tests of the manufactured link-type thumb rehabilitation robot were performed on normal male patients. Our results show that the robot can be used for flexibility and muscle-strength rehabilitation exercises for a patient's thumb.

        • KCI등재

          밀폐형 식물 생산 시스템에서 형광등 종류에 따른 시금치의 생육 및 기능성물질 함량

          김현민(Hyeon Min Kim), 김혜민(Hye Min Kim), 이혜리(Hye Ri Lee), 이재은(Jae Eun Lee), 황승재(Seung Jae Hwang) (사)한국생물환경조절학회 2017 시설원예‧식물공장 Vol.26 No.4

          본 연구는 밀폐형 식물생산 시스템에서 다양한 형광등 종류에 따른 시금치 ‘수시로'의 생육과 기능성물질 함량에 미치는 영향을 구명하기 위해 수행되었다. 종자는 128구 플러그 트레이에 암면을 이용하여 파종되었다. 시금치 묘는 재순환 담액식 수경재배 시스템을 이용하여 EC 1.5dS·m<SUP>-1</SUP>, pH 6.5의 밀폐형 식물생산 시스템에 정식되었다. 묘는 3가지 종류의 형광등 #S(NBFHF 32S8EX-D, CH LIGHTING Co. Ltd., China), #O( FHF32SSEX-D, Osram Co. Ltd., Germany), #P(FLR32SS EX-D, Philips Co. Ltd., The Netherlands)에 광도 150μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP> PPFD와 광주기 14/10 (명기/암기)으로 설정했다. 정식 후 재배환경은 온도 25±1℃와 상대습도 60±10% 였다. 정식 후 6주간 각 처리마다 30개체를 재배하였고, 생육 및 기능성 물질 함량을 3주째와 6주째 측정했다. 정식 후 3주째, #O 형광등에서 다른 처리구에 비해 초장과 엽폭이 유의적으로 컸다. 그러나 지하부의 생체중과 건물중은 #P 형광등에서 가장 높았다. 또한 총페놀 함량은 #P 형광등에서 유의적으로 가장 높았다. 정식 후 6주째, #O 형광등에서 초장, 지상부의 생체중 및 건물중에서 시금치의 생육이 향상되는 효과를 보였다. 총페놀 함량도 #O 형광등에서 다른 처리구에 비해 유의적으로 증가하였다. 그러나 항산화 활성은 모든 처리구에서 유의적인 차이를 나타내지 않았다. 따라서 이러한 결과는 밀폐형 식물생산 시스템에서 #O 형광등 처리가 시금치의 생육과 기능성물질 함량 축적에 효과적인 것으로 나타났다. This study was conducted to examine the growth and phytochemical contents of spinach (Spinacia Oleracea L. ‘Sushiro') as affected by different fluorescent lamps in a closed-type plant production system. Seeds were sown in a 128-cell plug tray filled in rockwool. The seedlings were transplanted into a DFT (deep floating technique) system with recycling nutrient solution (EC 1.5 dS·m<SUP>-1</SUP> and pH 6.5) in a closed-type plant production system. The seedlings were grown under 3 types of fluorescent lamp, #S (NBFHF 32S8EX-D, CH LIGHTING Co. Ltd., China), #O (FHF32SSEX-D, Osram Co. Ltd., Germany), and #P (FLR32SS EX-D, Philips Co. Ltd., The Netherlands) at 150 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP> PPFD with a photoperiod of 14/10 (light/dark) hours. Plants were cultured under condition of 25 ± 1℃ temperature and 60 ± 10% relative humidity after transplanting. Thirty plants per each treatment were cultivated for 6<SUP>th</SUP> week after transplanting. And growth and phytochemical contents were measured at 3<SUP>rd</SUP> and 6<SUP>th</SUP> week. At the 3<SUP>rd</SUP> week after transplanting, the parameter values of plant height and leaf width were higher in the #O than the others. However, fresh and dry weights of root were the greatest in the #P. In addition, total phenolic concentration was the greatest in the #P. At 6<SUP>th</SUP> week after transplanting, the #O had the greatest growth of spinach in the plant height and fresh and dry weights of shoot. The total phenolic contents significantly increased in the #O and showed significantly difference. However, there was no significant difference all treatments in antioxidant activity. Therefore, these results suggest that the #O was suitable for the growth and phytochemical accumulation of spinach in a closed-type plant production system.

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