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        • 인공 심장에서 작동하는 기계식 심장 판막의 음향 신호 특성 연구

          최민주,이서우,민병구 제주대학교 인공심장이식연구소 2001 인공심장 연구 Vol.2 No.1

          We studied the acoustical characteristics of the mechanical valve employed In the Korean type Artificial Heart. Bj□erk- Shiley tilting disc valve was chosen for the study and acoustic measurements were performed for the artificial heart operated in a mock circulation system as well as implanted to an animal as a Bi Venticular Assist Device (BVAD). In the mock system, three different conditions of the valve were examined which were normal, damaged (torn off), pseudo-thrombus attached. Microphone measurements for the BVAD were carried out at a regular time interval for 5 days after the implantation operation. Of the recorded acoustic emissions from the artificial heart, click sounds mainly originated from the valves were further analyzed using Multiple Signal Classification (MUSIC) for estimating their spectral properties. It was observed that the spectral peaks below 4 kHz and the optimal order number for MUSIC, equivalent to the number of the spectral component, might be the key parameters which were highly correlated to the physiological states of the valve such as the mechanical damage of the valve or the formation of thrombus on the valves.

        • KCI등재

          Color Doppler Twinkling Artifact: Possible Mechanisms and Clinical Potential

          최민주,Chang Hee Cho,강관석,양정화 대한의용생체공학회 2014 Biomedical Engineering Letters (BMEL) Vol.4 No.1

          In the color Doppler mode of ultrasonography, a rapidlychanging mixture of red and blue colors referred to as‘twinkling artifact’ (TA) may appear for a stationary hyperechogenictarget. This introduces ambiguity in diagnosis aswell as provides conclusive information. We reviewed thepossible mechanisms, and also illustrated the clinical potentialin the detection of pathological sites associated with calculi,calcifications, cacinoses and fibroses and foreign bodies suchas surgical clips, catheters, and guiding needles which wereinconclusive in conventional grayscale sonograms. In orderto increase the clinical utility of TA, a practical means toenhance TA was suggested which leads to a ‘TA mode’ to beimplemented in a clinical scanner.

        • KCI등재

          외식업체 직무특성별 교육훈련전이에 영향을 미치는 요인에 관한 연구

          최민주,윤지환 한국외식경영학회 2013 외식경영연구 Vol.16 No.1

          이 연구는 외식업체의 교육훈련 전이에 영향을 주는 요인을 알아보고 직무특성에 따른 교육훈련 전이의 차이를 알아보는 것이 목적이다. 연구 결과 조리부서의 특성을 반영한 교육이 부족하고 서비스부서 중심의 교육이 이루어지는 것으로 나타났다. 인적의존도가 높은 특성 때문에, 조리부서는 교육훈련에 참여하거나 지원하고 격려하는 조직의 지원이 부족하기 때문이라고 보여진다. 따라서 외식업체의 업무를 잘 이해하는 현장 감각이 있는 교육훈련자를 선정하고 양성하여 다양한 특성을 반영한 전문적인 교육을 실시하는 것이 교육훈련 전이에 영향을 미치게 될 것이다. 조직에서는 조직원들의 특성을 고려한 정기적인 교육훈련을 실시하여 직원들에게 동기 부여를 하고 조직의 성장과 개인 업무 향상에 도움이 될 수 있도록 하여야겠다. The purpose of this study lies in the analysis on factors for training transfer of restaurant business and appreciation differences on influential factors on training transfer by job characteristics. The research outcome shows shortage of training program reflecting features of cook department and concentration of training on service department. Due to job characteristic of high reliance on human resource, the cook department has insufficient supports to ensure participation in such training and trainers reflecting features of shortage in restaurant business. Therefore rewards and encouragement from organizational level should be made for effects of training transfer. Development of training program reflecting characteristics of cook department and organizational support are required. Trainers who understand on works of restaurant business and field experience should be nurtured and regular training should be conducted to motivate employees and to be helpful to the organizational growth and individual's work improvement.

        • Buton rock asphalt 사용에 따른 Micro surfacing 공법의

          최민주,임재규,김용주,이재준 한국도로학회 2015 한국도로학회 학술발표회 논문집 Vol.2015 No.3

          최근 세계 각지에서 이상기후 또는 기상이변으로 인하여 기록적인 재해가 발생하고 있다. 지구온난화 와 기온 상승에 따라 열대야의 증가와 같은 고온 현상이 증가하고, 우리나라 또한 이러한 변화와 다양한 환경적인 요인들로 인하여 포장면의 강우 및 온도 등의 변화가 전국적으로 감지되고 있다. 또한 기후는 아열대성 기후로 변화 될 가능성이 제기되고 있다. 점점 높아지는 기후와 교통량증가로 도로는 많은 피로 균열과 영구 변형이 발생하고 있다. 그러므로 도로파손이 발생한 초기에 도로를 보수하는 예방적 유지보 수공법의 필요성이 점점 더 중요시되고 있다. 이에 국내에서 사용되고 있는 예방적 유지보수 공법인 마이 크로서페이싱 공법에, 인도네시아 Buton 섬의 아스팔트를 생산하고 남은 부톤아스팔트의 골재를 적용하 는 연구를 수행하였다. 본 연구는 부톤 아스팔트 골재에 남아 있는 미소량의 아스팔트 성분이 마이크로서 페이싱 공법 적용 시에 성능 개선과, 골재로서 재활용의 가능성 여부를 판단하기 위해 수행하였다. 이에 부톤아스팔트 골재의 재활용과 마이크로서페이싱 공법의 성능을 개선시킨다면 경제적인 효과가 클 것으 로 판단된다. 이러한 연구 목적으로 본 연구에서는 마이크로서페이싱에 사용되는 천연골재 절감 및 골재 재활용을 통한 경제성 확보와 CO 배출량 감소를 통한 친환경적이며 내구성을 갖는 상온배합용 혼합물인 마이크로서페이싱 공법의 적용을 통한 공용성을 분석 하였다.

        • KCI등재

          유류오염토양이 식물식생에 미치는 영향에 관한 연구

          최민주,김주영,김정훈,최상일,Choi, Min-Zoo,Kim, Joo-Young,Kim, Jung-Hoon,Choi, Sang-Il 한국지하수토양환경학회 2010 지하수토양환경 Vol.15 No.1

          Oil contamination soil has been one of the most environmental social issues for decades in the inside and outside of country. The law of soil environmental preservation was carried out in the 1990s and the government controlled not only soil environment management and the remediation of contaminated soil but also promoted the development of remedial technology and cleanup business of contaminated soil by national policy. In addition to agriculture areas, the main oil contaminated sites are a gas station, oil reservoir, petro-chemical complex, site of railway carriage base and military camp. The contamination-frequency of agriculture area and effect sites are low but it has significantly important area on account of producing food for human beings. Therefore, we should be concerned about oil contamination damage of agriculture area. The oil contamination damage of agriculture area influenced drop of birth and breeding since the oil directly adheres to seeds and farm products even diffusion of contaminated soil to cultivation area. The studies of the crops and the food vegetation has not enough detailed data caused by the incident of oil contamination. This study investigated the effect of oil in germination and growth of selected plant seeds. In this study, we try to verify whether the oil contamination by accidents on farmland influenced the damage of farm produce and the mutual relation both oil contaminated soil or the vegetation of crops. The impact of oil on plant development was followed by phytotoxicity assessments. The plants exhibited visual symptoms of stress, growth reduction and perturbations in developmental parameters. The increase of the degree of pollution induced more marked effects in plants, likely because of the physical effects of oil. The relationships between the phytotoxicity contents of plants and growth reduction suggest a chemical toxicity of fuel oil. In addition, while cleaned up the contaminated soil under the standard of contaminated soil we examined it was suitable for region standard and it may have practical possibility for fill material of construction of afforestation and molding soil of landfill.

        • KCI등재

          TDF ash를 채움재로 사용한 아스팔트 콘크리트 물성 평가

          최민주,이재준,김혁중 한국도로학회 2016 한국도로학회논문집 Vol.18 No.4

          PURPOSES: The new waste management policy of South Korea encourages the recycling of waste materials. One material being recycled currently is tire-derived fuel (TDF) ash. TDF is composed of shredded scrap tires and is used as fuel in power plants and industrials plants, resulting in TDF ash, which has a chemical composition similar to that of the fly ash produced from coal. The purpose of this study was to evaluate the properties of an asphalt concrete mix that used TDF ash as the mineral filler. METHODS: The properties of the asphalt concrete were evaluated for different mineral filler types and contents using various measurement techniques. The fundamental physical properties of the asphalt concrete specimens such as their gradation and antistripping characteristics were measured in accordance with the KS F 3501 standard. The Marshall stability test was performed to measure the maximum load that could be supported by the specimens. The wheel tracking test was used to evaluate the rutting resistance. To investigate the moisture susceptibility of the specimens, dynamic immersion and tensile strength ratio (TSR) measurements were performed. RESULTS : The test results showed that the asphalt concrete containing TDF ash satisfied all the criteria listed in the Guide for Production and Construction of Asphalt Mixtures (Ministry of Land, Infrastructure and Transport, South Korea). In addition, TDF ash exhibited better performance than that of portland cement. The Marshall stability of the asphalt concrete with TDF ash was higher than 7500 N. Further, its dynamic stability was also higher than that listed in the guide. The results of the dynamic water immersion and the TSR showed that TDF ash shows better moisture resistance than does portland cement. CONCLUSIONS : TDF ash can be effectively recycled by being used as a mineral filler in asphalt, as it exhibits desirable physical properties. The optimal TDF ash content in asphalt concrete based on this study was determined to be 5%. In future works, the research team will compare the characteristics of asphalt concrete as function of the mineral filler types.

        • KCI등재

          고강도 집속형 초음파의 주파수 성분 특성에 따른 공동 현상 억제 효과

          최민주 한국음향학회 1999 韓國音響學會誌 Vol.18 No.5

          The paper looked into the effects of the spectral properties (waveform) of the high intensity focused ultrasound on suppression of the ultrasonic cavitation. Three different types of ultrasound were considered in the study, which were sinusoidal (1 MHz, 5 MPa), frequency modulated (from 1 MHz to 6 MHz for 10 ㎲, 5 MPa), asymmetrically shocked (fundamental frequency 1 MHz, peak positive pressure 12 MPa, peak negative pressure -4 MPa). The temporal response of an air bubble in water initially 1 ㎛ in radius to each type of the ultrasound was predicted using Gilmore bubble dynamic model and Church's rectified gas diffusion equation. It was shown that the radially pulsating amplitude of the bubble was greatly reduced for the frequency modulated wave and was little decreased for the shock wave, compared to the case that the bubble was exposed to the sinusoidal wave. It is interesting that the bubble response to the frequency modulated wave remains similar when the frequency component of the modulated ultrasound is beyond the bubble resonant frequency 3 MHz. This implies that, although the ultrasound is modulated up to 3MHz rather than up to the present 6 MHz, it is likely to produce similar cavitation suppression effects. In practice, it means that a typical narrow band ultrasonic transducer can be taken to generate an appropriate frequency modulated ultrasound to reduce cavitation activity. The present study indicates that ultrasonic cavitation may be suppressed to some extent by a proper spectral modification of high intensity ultrasound. 본 논문에서는 고강도 집속형 초음파의 주파수 특성(파형)에 따른 초음파 공동 현상을 억 제하는 효과를 살펴보았다. 본 연구에서는 세가지 파형, 즉, 정현파(1 MHz, 5 MPa), 주파수 변조파(10 ㎲ 동안 1 MHz에서 6 MHz까지 선형적으로 증가, 5 MPa), 비대칭 충격파(기 본 주파수 1 MHz, 양압 12 MPa, 음압 -4 MPa)를 고려하였다. 동일한 강도(833 W/㎠)를 가지는 각 초음파에 노출된 초기 반경이 1 ㎛인 물 속에 있는 공기 기포의 반응을Gilmore bubble dynamic model 및 Church's rectified gas diffusion equation을 이용하여 예측하였다. 기포 진동의 크기는, 정현파에 노출된 경우와 비교하여, 주파수 변조된 초음파의 경우 현저히 감소하였고, 비대칭 충격파의 경우 약간 감소함을 볼 수 있었다. 흥미롭게도 주파수 변조파에 대한 기포의 반응은 변조된 초음파의 주파수 성분이 기포의 공진 주파수(3 MHz) 이상에서는 거의 동일하게 유지되는 것으로 나타났다. 이 사실은 주파수 변조를 현재의 1 MHz부터 6 MHz까지에서 1 MHz부터 3 MHz까지로 줄여도 유사한 공동 억제 효과를 얻을 수 있음을 암시한다. 실용적으로, 비교적 좁은 밴드 폭을 가지는 범용 초음파 변환기를 이 용하여 초음파의 공동 현상 억제 효과를 얻기 위한 주파수 변조를 구현할 수 있음을 의미한다. 본 연구의 결과는 초음파의 적절한 주파수 성분 조절로 초음파의 공동 현상을 일정 수준 억제할 수 있음을 시사한다.

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