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      • KCI등재

        NiFe/Ta(t)/NiFe 박막을 이용한 평면홀 바이오센서로서 고감도 특성 연구

        이상석 한국자기학회 2020 韓國磁氣學會誌 Vol.30 No.5

        As a device that measures a fine magnetic field to be used as a biosensor, a simple multilayered cross-shaped current and voltage terminals are formed. The sensitivity of planar Hall voltage sensitivity (SPHV) were obtained from the planar Hall voltage (PHV) curve, which was measured by applying an external magnetic field perpendicular to the magnetization easy axis. The PHV curve for the NiFe(6 nm)/Ta(20 nm)/NiFe(6 nm) multilayer changed linearly in the region of ±0.9 Oe, and the SPHV was 500 V/Oe. In particular, as the increased sensing current from 1.0 mA to 40 mA, the SPHV was from 2.0 mV/Oe to 398 V/Oe. These results suggested the possibility of developing a PHR biosensor with high sensitivity even with a multilayer structure formed of a bottom Ta layer and a ferromagnetic NiFe layer. 바이오센서로 활용할 미세한 자기장을 측정하는 소자로서 단순한 다층박막 십자 모양의 전류단자와 전압단자를 형성하였다. 자화용이축과 수직으로 외부자기장을 가하여 측정된 평면홀전압(PHV) 곡선으로부터 평면홀전압 민감도(SPHV)를 구하였다. NiFe(6 nm)/Ta(20 nm)/NiFe(6 nm) 다층박막 구조 시료에 대한 PHV 곡선은 외부자기장 0 Oe를 중심으로 ±0.9Oe 미세한 자기장 영역에서 선형적으로 변하였고, SPHV가 500 V/Oe인 민감도 특성을 보였다. 특히 센싱전류가 1.0mA에서 40mA 증가함에 따라SPHV는 398 V/Oe에서 2.0mV/Oe로 나타났다. 이러한 결과는 바닥층 Ta 층과 강자성체 NiFe 층으로 형성된 다층박막 구조로도 높은 감도를 갖는 PHR 바이오센서로 개발할 수 있는 가능성을 제시하였다.

      • 본논 막바지 관리와 병충해방제

        이상석 한국작물보호협회 1985 자연과 농업 Vol.6 No.9

        금년도에도 전기 벼농사는 풍년이 될 것임을 보여주고 있다. 초장이나 경수로 보아 약간 떨어지기는 했으나 수량에는 큰 지장을 줄 것 같지 않고 오히려 등숙이 나아질 수 있는 여건이 되기 때문에 큰 기대를 해봄직도 한 상황이다. 그러나 해에 따라서는 예기치 않은 재해와 막바지의 병충해 피해로 말미암아 그 기대가 어긋나는 해도 있었다. 지난 1975년도에서도 모두 풍년임을 자긍하다가 벼멸구의 피해로 그 기대가 사라진 적이 있지 않았던가. 전기 벼농사는 벼의 잎과 줄기를 즉 초장과 경수를 만드는 기간이라면 후기 벼농사는 우리가 실제 필요로 하는 쌀을 만드는 과정이다. 앞으로 해야할 중요한 관리는 물대기 알거름주기 병충해 방제 그리고 제때 벼베기 하는 것들이다.

      • KCI등재
      • KCI등재

        비정질 n형 Si 박막을 이용한 자기터널링 트랜지스터 제작과 특성

        이상석,이진용,황도근,Lee, Sang-Suk,Lee, Jin-Yong,Hwang, Do-Guwn 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.3

        Magnetic tunneling transistor (MTT) device using the amorphous n-type Si semiconductor film for base and collector consisting of the [CoFe/NiFe](free layer) and Si(top layer) multilayers was used to study the spin-dependent hot electron magnetocurrent (MC) and tunneling magnetoresistance (TMR) at room temperature. A large MC of 40.2 % was observed at the emitter-base bias voltage ( $V_{EB}$ ) of 0.62 V. The increasing emitter hot current and transfer ratio ( $I_{C}$/ $I_{E}$) as $V_{EB}$ are mainly due to a rapid increase of the number of conduction band states in the Si collector. However, above the $V_{EB}$ of 0.62 V, the rapid decrease of MC was observed in amorphous Si-based MTT because of hot electron spin-dependent elastic scattering across CoFe/Si interfaces.

      • KCI등재

        센서용 거대자기저항 스핀밸브소자의 열처리 효과

        이상석,박상현,소광섭,주호완,김기왕,황도근,Lee, Sang-Suk,Park, Sang-Hyun,Soh, Kwang-Sup,Joo, Ho-Wan,Kim, Gi-Wang,Hwang, D.G. 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.4

        셀(cell) 단위의 생체분자의 자성특성 검출을 위한 거대자기저항-스핀밸브(giant magnetoresistance-spin valves; GMR-SV) 바이오센서로서 미세 패턴된 모양에 따라 길이 방향과 폭 방향 용이축에 의존하는 자기저항 특성을 연구하였다. 바이오센서(biosensor)로서 사용할 스핀밸브 다층구조는 glass/NiO/NiFe/CoFe/Cu/CoFe/NiFe 이었다. 자성 다층박막의 일축이방성을 만들기 위해 증착시와 소자 패턴닝 후 진공 열처리를 $200^{\circ}C$에서 300 Oe 정도 외부자기장을 인가하였다. 형상자기이방성 효과를 고려하여 광 리소그래피 과정으로 얻은 미세 활성영역 패턴 사이즈는 $2{\times}5{\mu}m^2$로 정하였다. 2단자법으로 길이방향의 센싱전류와 폭 방향의 고정층의 용이축 방향 각도에 의존하는 자장민감도의 변화는 바이오센서 소자로서 활용에 중요한 요인임을 확인하였다. In order to detect of the magnetic property in the cell unit, we studied the GMR-SV (giant magnetoresistance-spin valves) biosensor, which was depended on the micro patterned features according to two easy directions of longitudinal and transversal axes. Here, the multi layer structure was glass/NiO/NiFe/CoFe/Cu/CoFe/NiFe. The uniaxial anisotropy direction was applied to the patterned biosensor during the deposition and vacuum post-annealing at $200^{\circ}C$ under the magnitude of 300 Oe, respectively. Considering the magnetic shape anisotropy effect, the size of micro patterned biosensor was a $2{\times}5{\mu}m^2$ after the photo lithography process. By our experimental results, we confirmed that the best condition of GMR-SV biosensor should be the same direction of the axis sensing current and the easy axis of pinned NiO/NiFe/CoFe triple layer oriented to the width direction of device, and the direction of the easy axis of free CoFe/NiFe bilayer was according to the longitudinal direction of device.

      • KCI등재
      • KCI등재

        Method of Finding Highly Sensitive Points of GMR Sensors by Using Laser Irradiation

        이상석,박상현,소광섭,윤길원 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4

        The relation between the thermal temperature effect and giant magnetoresistance (GMR) has been studied to develop it for applications, such as read heads in high-density media or multianalyte biodetection. This study investigated the thermal effect of a laser on a GMR sensor whose resistance will change upon laser irradiation, disturbing its resistance signal. A GMR biosensor was fabricated for detecting a single micro-sized particle. The size of the particles is 2 × 5 μm2 and the magneto-resistance (MR) ratio was approximately 5.8 %. A 633 nm He-Ne laser was used to irradiate on the GMR sensor and its intensity was changed from 0 to 10 mW. The GMR signals showed that the laser irradiation caused the GMR sensor signals to increase due to the direct absorption of laser light. The measured signals increased as the laser's intensity was increased. The GMR signal was changed by up to 0.6 % at 10 mW. In addition, some special peak in the variation rates existed during the laser irradiation. However, the GMR ratio did not vary. These results can be applied during design and fabrication of various GMR biosensors that are used with a light source.

      • KCI등재

        골프장 서비스품질, 고객만족과 재이용 의도간의 관계

        이상석 한국품질경영학회 2004 품질경영학회지 Vol.32 No.3

        This research analysed the interaction which focus on service quality perception, customer satisfaction, re-use intention in the golf club. First of all, we review the existing literature on measurement of service quality and management. As a result of this review and survey of the employer in golf club, thirteen factors emerged as important to the service management of the golf club; Reservation and Access(RSNA), Golf Course and Convenience Facilities(GCNF), Personal Services(PSER) and After Services(ASER). The structural equation model was utilized for analyzing the influence of service quality factors upon the customer satisfaction and re-use intention. Results show that service quality factors have a statistically significant impact on the customer satisfaction of the golf club. RSNA and GCNF investigated the factors influencing on the satisfaction degree . of the customers. But the GCNF and PSER were not significant. Especially, GCNF factors directly influenced on the customer satisfaction and also indirectly impact on the intention of using again.

      • KCI우수등재

        조경시설공사의 시공품질 분석을 통한 품질관리항목의 중요도 연구

        이상석,최기수 한국조경학회 1997 韓國造景學會誌 Vol.25 No.3

        This study aims to estimate the relative importance of quality management items through the defect analysis in the landscape construction process. The RIQMI are decided by the defect coefficient and it's cause weight. The defect items in the landscape construction process were classified by 56 items based on the classification form of '96 landscape architectural construction standard and the cause pattern were categorized 4 types as design, material, construction, and environment factors. To analyze the defect coefficient and the aucse weight by defect, the researcher surveyed the questionnaires on the 103 engineers and the 31 experts on the landscape architectural construction. The result of this study are as follows. The relative importance by facilities pattern turn out to be much higher construction, material fator than design. environment factor in wood facilities, paving facilities, and steel facilities, the RIQMI is very high in timber crack, timber vending, faulty of timber against decay, welding faulty of steel facilities in material factor, and timber crack, faulty of timber against decay, finish faulty of steel facilities, welding faulty of steel facilities in construction factor.

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