RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제
      • 좁혀본 항목 보기순서

        • 원문유무
        • 음성지원유무
        • 학위유형
          펼치기
        • 주제분류
          펼치기
        • 수여기관
          펼치기
        • 발행연도
          펼치기
        • 작성언어
          펼치기
        • 지도교수
          펼치기

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 공동주택 지하주차장 평면형태 및 환기구의 배치에 따른 공기유동에 관한 연구

        박성원 부산대학교 2010 국내석사

        RANK : 247805

        The study on the airflow based on the array of ventilator and plan of the underground parking lot in apartment As demands of the residents have been variously changing according to the construction of the apartment house and the fast economic growth, the construction companies spurs the development of the apartment house flavored with environmental friendly factors. Also because of the multiple apartment project, the basement car park alone can not handle the rapid growth of the vehicles and the resident puts more and more emphasis on securing car park space for the freedom from the vehicles on the ground and for the safety of their children. Recently, as the interest about natural energy, the tendency minimizing the mechanical energy also appears. According to this trend, there has been growing attempts in order to apply the environmental friendly technologies to the apartment house. But the reality is that the systems doesn't virtually function well because the existing mechanical systems are applied. Consequently, the deterioration of the air and the brightness in the basement car park exacerbates the environments of the basement car park. And the study on the feasibility of the natural ventilation according to the unit-plan type of the basement car park and the performance of the skylight, is still insignificant. Thus, in this study, we intend to simulate, through the CFD, the air current by natural driving power by classifying the existing basement car parks into the unit-plan type and the direction of the vehicle traffic. Through classifying the existing basement car parks by the type of vehicle traffic that is the type of arrangement such as one-way or bidirectional traffic and deploying the ventilating openings by 3 types which enables the skylights, linked the ground for the purpose of collecting the light, play the role of ventilation at the same time, we forecast the air current of the basement car park by using CFD(Computational Fluids Dynamics) and, based on that, suggest the plan to improve the ventilating function of the basement car park by utilizing the natural ventilation. In this study, we research the general theories, that is 'the ventilation theory of underground space and the test method of ventilating performance' and interpret, through CFD, the air current of the target models according to the layout of the ventilation openings based on mean of air age and air exchange effectiveness by using computer simulation. As a result, we draw the conclusion as follows: (1) In respect of the air age according to the type of the vehicle traffic such as one way traffic and bidirectional traffic, the bidirectional traffic shows 30,405 seconds while 14,070 seconds in one way traffic indicating that the one way traffic abates by more than 50%. Therefore, the air of the basement car park with one way traffic has superior air quality because of its' shorter air age. (2) In case of the existing basement car parks, Case A' air exchange rate is 4.44 while 7.76 times/h in Case B and 1.94 times/h in Case C. It appears comparatively small in Case C. We can draw the conclusion, through this finding, that the placement of several natural ventilators in the middle and on the edge is more effective than the placement of the natural ventilator with big area in the middle when placing natural ventilator. (3) In case of Case B where the installation is in the middle and on the edge of the basement car park, it appears excellent in both the air exchange and the air age, but the effective area of the space on the ground abates. There requires a plan for the placement accordingly. (4) In case of Case C where the circular air-vent with the smallest area of air-vent is installed, the velocity of air current appears the fastest. Thus, it seems that there requires the research on the appropriate size and the layout plan of the circular air-vents for the purpose of the increase of effective space on the ground. It is also necessary to comprehend the appropriate locations in order to improve the performance of the natural ventilation, through examining the characteristic of the air current according to the type of ventilating openings installed in the basement car park, the velocity of the current, the pressure distribution and the installation of the auxiliary equipments for the natural ventilation.

      • Genetic analysis of PARK2 gene in Korean patients with Parkinson's disease

        박인원 忠南大學校 新藥專門大學院 2016 국내박사

        RANK : 247805

        Mutations in PARK2 are considered a common cause of Parkinson’s disease (PD). To assess the frequency of PARK2 mutations in the Korean population, we screened the PARK2 gene in 83 Korean PD patients: two young onset (YO, ≤49), 32 middle onset (MO, 50-69) and 49 late onset (LO, 70). Detection of the point mutations was performed by direct sequencing of the PARK2 exons, and exonic rearrangements were analyzed using multiplex ligation-dependent probe amplification (MLPA). Five known PARK2 variants were identified in 53 (63.9%) of the Korean PD patients: two missense mutations (Y267H and M458L) and three polymorphisms (S167N, L272I and V380L). We also found an increased frequency of PARK2 variants in PD patients and a lowered PD age at onset (AAO) in those having two variants, suggesting that the genetic variation in PARK2 gene might be a genetic risk factor of PD in Korean population.

      • How does the national park management deliver their services? The perspective of service marketing focused on gunung gede pangrango national park, Indonesia

        Maulana, Firman 서울시립대학교 국제도시과학대학원 2018 국내석사

        RANK : 247804

        인도네시아에 설립된 가장 오래된 국립공원 중 하나인 구눙 게대 빵랑오 국립공원(GGPNP)은 관광 개발의 기초로 생태관광을 선택했다. 생태관광과 관련된 모든 혜택에 관계 없이 미래에 최적의 이익을 얻으려면 여전히 해결해야 할 과제가 있다. 정부기관으로서 GGPNP는 방문객에게 서비스를 제공하는 관광 활동을 지원하는 단순한 관리 이상의 또 다른 역할을 한다. 최근의 사실은 국립공원에 방문하는 관광객 수가 여전히 적다는 것을 보여주며 그 이유 중 하나는 국립공원에서 마케팅에 대한 관심이 낮기 때문이다. 국립공원은 또한 성과 중 하나인 방문 관광객 수에 대한 목표를 달성해야 하지만 GGPNP의 경영진은 서비스 마케팅을 시행하여 국립공원을 홍보하는 방법에 주목하기 시작해야 한다. 이러한 이유로 본 연구는 서비스 마케팅 관점에서 GGPNP가 서비스를 제공하는 방법을 조사하기 위해 실시되었다. 또한 이 논문은 생태관광 원리를 강조하는 경영진 측면과 인지된 서비스 성과 차원을 강조하는 방문객 관점에서 서비스 마케팅의 3가지 요소(인력, 물리적 증거, 프로세스 관리)를 탐구한다. 조사 결과에 따르면 GGPNP의 서비스 마케팅 구현은 전반적으로 중간 수준이다. 이는 GGPNP가 이미 표준 서비스 마케팅을 수행하지만 마케팅 가치를 높이기 위해 해결하고 개선해야 할 몇 가지 사항이 있다는 것을 의미한다. 인적 요소의 경우 GGPNP는 방문객에게 더 나은 서비스를 제공하기 위해 더 많은 인력을 충원하고 더 많은 교육을 제공해야 한다. 물리적 증거 요소의 경우 방문객은 GGPNP가 국립공원 지역에 머무는 동안 방문객에게 더 많은 지식과 편의를 제공하기 위해 국립공원 지역에 정보 표지판과 위생 시설을 개선하거나 추가해야 한다고 생각한다. 마지막으로, 프로세스 관리 요소에서 GGPNP는 더 많은 절차를 추가하고 고객 평가, 방문 우선순위 시민에 대한 대우(노인, 임산부, 장애인, 어린이), 방문객에게 피드백을 제공하는 방식에 대해 구체적인 사항을 추가해야 한다. GGPNP의 경영진에게 이 결과가 의미하는 바는 특히 인도네시아에서 국립공원의 서비스 마케팅에 대해 논의하는 이전 연구가 없었기 때문에 공식적인 계획 전략을 위한 마케팅 참조자료와 디딤돌을 제공하는 것이다. 또한 훌륭한 서비스 마케팅을 시행함으로써 장기적으로 국립공원을 방문하여 보존 메시지를 받고 환경에 대한 소속감을 높일 수 있는 사람들이 더 많아질 것이다. Gunung Gede Pangrango National Park (GGPNP) one of the oldest national parks established in Indonesia has chosen ecotourism as the basis of their strategy in developing tourism. Regardless of all of the benefits that come with ecotourism, there are challenges that are still need to be addressed to gain optimum benefit in the future. As a government agency, GGPNP has another role than just mere conservation which is supporting tourism activities which mainly about delivering a service to its visitors. The recent data shows that the number of tourist arrival to the national park is still low, and one of the reasons is the low interest of marketing for a national park. While the national park also needs to achieve the target for tourist arrival as one of their performance, the management of GGPNP needs to start their attention on how to market the national park through the implementation of service marketing. Due to these reasons, this research was conducted to examine how the GGPNP delivers their services from the perspective of services marketing. In particularly, this thesis explores the three elements of services marketing (personnel, physical evidence, and process management) from the perspective of management which emphasizes ecotourism principles and the perspective of visitor which emphasizes on perceived service performance dimension. The results of this survey show that as overall the implementation of service marketing in GGPNP is at a moderate level. This means that GGPNP already perform standard service marketing but there are several things that need to be addressed and improved to increase their marketing value. From the personnel element, the GGPNP need to consider adding more personnel and provide them with more training in order to deliver better services to the visitor. For the physical evidence element, the result also shows that the visitor thinks that GGPNP needs to improve or add more information signage and sanitary facilities in the national park area to give more knowledge and comfortability toward visitor during their stay in the area of national park. Lastly, from the process management element shown that GGPNP need to add more procedure and put more specific details on customer evaluation, treatment for priority citizen (elderly, pregnant woman, disabled person, and children) that come to visit, and how they provide their feedback to the visitor. This research is expected to serve as a stepping stone and reference on marketing and planning strategies of GGPNP since there was no previous research that discusses service marketing in the national park especially in Indonesia. Furthermore, by implementing good services marketing it is expected that for long-term outcome there will be more people to visit a national park to receive the message of conservation and hence increase their sense of belonging toward the environment.

      • Spatio-Temporal Patterns of Human-wildlife Conflict in Bardia National Park, Nepal

        PAUDEL, Prabin University of Seoul, International School of Urban 2021 국내석사

        RANK : 247676

        지구 생태계의 균형을 이루기 위해서는 야생 생물 보존이 필수적이다. 하지만 야생 동물이 인간에게 피해를 입히면 인간은 그에 대한 복수로 야생 동물을 살상한다. 따라서 생태계 및 인간이 영위하는 생활의 지속 가능성을 위해서는 충돌을 최소화해야 한다. 인간과 야생 동물의 충돌은 바르디아 국립 공원(Bardia National Park)의 주요한 해결 과제이다. 효과적인 충돌 관리를 위해서는 구체적인 시공간 정보가 필수적이다. 그렇기 때문에, 본 연구에서는 바르디아 국립 공원의 완충 지대에서 11년(2010~2020) 동안 발생하여 기록된 충돌의 시공간적 분포를 조사하였다. 데이터 분석에는 기술 및 추론 통계를 사용하였다. 분석 결과에 따르면 기록된 충돌 횟수가 매년 증가하고 있다. 평균적으로 연간 806 건의 충돌이 기록되었다. 이 보호 구역에서 발생한 충돌의 주요 대상 종은 코끼리와 표범인데, 충돌의 59%가 남부 지역에서 기록되었다. 인간과 코끼리의 충돌 중 60% 이상이 8월, 9월, 10월 및 11월에 발생했다. 충돌이 가장 빈번한 계절은 종마다 다르지만, 코끼리, 표범, 호랑이 및 멧돼지의 경우 충돌의 계절적 분포가 유의미하다. 조사 대상 기간 동안의 손실 평가액 중 37%만이 보조금 형태로 지급되었다. 보조금을 받기까지의 과정도 길다. 따라서 지역을 바탕으로 주요 충돌 종을 관리하기 위한 월간 일정이 필수적이다. 초식 동물의 입맛에 덜 맞는 대체 작물을 재배하고 육식 동물의 침입을 막을 수 있는 축사를 장려하는 것이 필요하다. 전기 울타리를 설치하고 유지하며 대체 생계 수단을 제공함으로써 사람들의 삼림 출입을 줄이는 것 또한 중요하다. 이에 더해, 지역 사회를 대상으로 야생 동물의 행동에 대한 지식을 제공하고 교육을 실시하는 또한 바르디아 국립 공원 내에서의 충돌 사고를 축소하는 데 도움이 될 것이다. 주요어: 인간과 야생 동물의 충돌, 시공간 분포, 바르디아 국립 공권, 완충 지대 Human-wildlife conflict is one of the major conservation challenges. Detail spatial and temporal information is essential for effective conflict management. Therefore, this study examines the distribution of conflicts based on space and time for eleven years (2010 to 2020) in the buffer zone of Bardia National Park. Descriptive and inferential statistics were used to analyze the data. The result shows that the number of human-wildlife conflicts is increasing annually. Where on average, 806 conflicts per year were recorded. Elephant and leopard are the major conflicting species in this protected area, and 59 % of the conflict was recorded in the southern regions. More than sixty percent of human-elephant conflicts are recorded in August, September, October, and November. Major conflicting seasons vary with the species, where the distribution of conflict is significantly varied with the seasons for elephant, leopard, tiger, and wild boar. Attack due to carnivore is significantly higher in the new moon phase periods. Only 37 % of the evaluated loss was paid to the victim as a relief. A monthly calendar for the management of major conflicting species is essential. Farming of alternative crops that are less palatable for the herbivores and promoting predator-proof livestock shelter is needed. Where construction and maintenance of electric fences and reduction of dependency over forest resources by providing alternative sources of livelihood are crucial. Furthermore, providing knowledge and training about wildlife behavior to the local community will reduce the conflict and increase the harmony between people and wildlife.

      • First-Principles Characterization of Transition Metals on Oxide Films

        Park, Jinwoo University of Seoul 2010 해외박사

        RANK : 247663

        Oxide-supported metal clusters and thin films have attracted a great deal of interest due to their importance in a wide range of technological applications, such as heterogeneous catalysis, gas sensors, corrosion-protective coatings, photovoltaic devices, and microelectronics. The adsorption, growth, and electronic characteristics of metal atoms adsorbed on oxides are of special interest, because these factors are supposed to help design and optimize methods for controlling processes concerning the desired chemical reaction and product. In this thesis, we performed ab initio electronic structure calculations to study the interactions of metal adatoms with ionic oxide atoms involving regular oxide surface atoms, surface oxygen defects like Fs centers, and metal supports. As an oxide, an MgO(001) surface, a prototype of an ionic oxide surface, was chosen here. All calculations were carried out using the density functional theory (DFT). First, a systematic approach was employed to investigate the adsorption geometries and electronic structures of late transition series (Cu, Ag, Au, Ni, Pd, and Pt) on ideal defect-free MgO(001) surfaces. For the above elements, the adsorption geometries, diffusion, and associated electronic structures were examined. Our calculations showed the favorable adsorption of the transition metal (TM) adatoms on top of the surface O atom. Further analysis showed that the TM-induced states formed in the gap region of MgO(001) vary significantly with the adsorption geometries. The DFT calculations have been also applied to investigate the adsorption of the TM adatoms (Cu, Ag, Au, Ni, Pd, and Pt) on defective MgO(001) surfaces with Fs centers as surface defects of oxides. The TM adatoms were found to favorably bind on the Fs centers. From the calculated adsorption structures and electronic structures, we carried out a systematic comparative analysis of the interactions of the metal adatoms with the surface oxygen vacancy and the regular surface oxygen atom of MgO(001). Finally, the adsorption of metal adatoms (Au and Pd) on Fe-supported ultrathin MgO(001) films was studied. Experimentally, it is well known that MgO films are epitaxially grown on Fe(001) due to their favorable physical properties. As such, the Fe/MgO/Fe junctions have been used as a system for magnetic tunnel junctions (MTJs) with huge tunneling-magnetoresistance (TMR) values. Interestingly, our calculations showed that the MgO/Fe(001) films we propose in this work can be used as a viable thin oxide model system. An analysis of the electronic structures in the systems reveals the negative charging even for Pd adatoms with a lower electron affinity. This indicates that the Fe substrate supporting the MgO films significantly influences charge and/or spin states of the metal adatoms. The physical origin of the negative charging of Pd was also discussed. These calculations demonstrate the importance of the interactions of the metal adatoms with underlying oxides for controlling the electronic and chemical properties of metal adatoms, such as charge and spin states.

      • Study on flexible potentiometric ion sensors for smart water quality monitoring systems

        Park, Chani Kwangwoon University Graduate School 2022 국내석사

        RANK : 247663

        Recently, numerous studies have been performed to develop electrochemical-based biosensors with advantages of wide detection range, high sensitivity, and miniaturization. In particular, the potentiometric ion sensor is attracted, since it can cover a broad application area of electrochemical sensors. In the past, since ion detection methods required large machines to analyze electrolytes, in situ testing with continuous monitoring was not feasible. Recently, potentiometric ion sensors have been implemented in many new application fields such as smart health care monitoring and environmental analysis. To date, numerous studies have been reported to improve the performance such as stability, reliability, reproducibility and lifespan of potentiometric ion sensors. Accordingly, various new materials including nanomaterials, carbon materials, polymers, and metals have been utilized as transducer layer. However, nanomaterial-based potentiometric sensors still face several challenges such as the complicated process of synthesizing nanomaterials, the high cost of nanomaterials, aggregation and restacking problem of nanomaterials, low electron transfer rate, low electrochemical surface area, etc. Because of these challenges, the fabrication of new transducer-based sensing electrodes for potentiometric ion sensors requires further investigation with successful strategies. In this thesis, we proposed and studied several transducer layers for single and multi-analyte detection ion sensors. The first approach was to develop a treated poly(3,4- ethylenedioxtthiophene):poly(styrene sulfonate) (PEDOT:PSS) transducing layer with decreased hydrophilicity. The hydrophilicity of the transducing layer causes the formation of a water layer at the buried interface, which degrades the performance of the sensor. Through this study, the reduced hydrophilicity of the material was demonstrated as a way to achieve the high stability of the sensor. The Ca2+ ion-selective sensor was comprised of PET film, carbon electrodes, and an ion-selective membrane for a simple fabrication process. PEDOT:PSS was treated with ethylene glycol (EG) to reduce the hydrophilicity of the carbon electrode, and then well covered with a Ca2+ ion-selective membrane. The fabricated Ca2+ ion-selective electrode (Ca2+-ISE) exhibited excellent sensitivity and fast response. Moreover, negligible potential drift demonstrated the stability of PEDOT:PSS-EG compared to the pristine PEDOT:PSS-based transducing layer. The second approach was to develop a multi-ion sensor that can measure calcium, chloride, and hydrogen ions for tap water quality monitoring. The multi-ion sensor was developed with highly reproducible technology including photolithography, evaporation, electroplating, and electropolymerization to minimize the initial potential deviation of each fabricated sensor. The developed multi-ion sensor was utilized to measure the normal range of each ion in tap water and investigated its sensitivity, repeatability, selectivity, and lifetime. Finally, it was also confirmed that the developed sensor can be utilized for water quality inspection by measuring real tap water sample.

      • Optimization of lung magnetic resonance imaging using ultra short echo time sequence and retrospective respiratory gating

        Park, Jinil Sungkyunkwan university 2020 국내박사

        RANK : 247647

        Three-dimensional (3D) ultrashort echo-time (UTE) imaging with radial k-space acquisition is a wellknown MR imaging technique that generates comparable lung images to X-ray and computed tomography (CT), unlike conventional MR imaging technique. 3D radial UTE imaging technique is suitable for pulmonary magnetic resonance imaging because it is less sensitive to motion than conventional Cartesian MRI imaging techniques, but there is still a need to accomplish further reduction of motion artifacts through respiratory gating. The purpose of this study is to introduce a method for optimizing retrospective respiratory gating and to provide improved lung MRI. Acquiring stable breathing information is important for retrospective respiratory gating. Chapter 2 introduces a robust self-navigation method for respiratory gating in three-dimensional radial UTE lung imaging. The proposed new self-search method acquires the dual search echo successively in the direction of the superior-inferior and uses the second search echo for tracking respiratory movements. It is not influenced by k-space trajectory order, so that stable respiratory signal without baseline fluctuation can be obtained. The phantom and human experimental results showed that the proposed method successfully suppressed the baseline fluctuations of the navigating-echo signals and the resulting respiratory signals, thereby reducing the respiratory-motion artifacts like blurring in the human lung images thanks to the improved respiratory gating. In Chapter 3, we propose a 3D radial sampling strategy for maintaining uniform k-space coverage after retrospective respiratory gating by going through two steps. First, a multi-shot, interleaved sampling function is designed in a way that uniformly distributes k-space samples within each interleaf for a given number of views per interleaf. Second, an optimal number of views per interleaf is derived based on an approximate model of a respiratory pattern such that the retrospective acceptance of k-space data occurs evenly across the obtained interleaves. In conclusion, the proposed 3D radial-sampling scheme can effectively suppress the image artifacts due to non-uniform k-space sample density in retrospectively respiratory gated lung MRI by uniformly distributing gated radial views across the k-space. In addition, Chapter 4 proposes two methods to reduce streak artifacts in radial acquisition MRI. First, spectral preparation pulses were applied in UTE imaging technique to suppress fat signal increase due to short TR and short TE. Second, we suggested a method for acquiring volume-selected signals in 3D radial imaging, introducing a novel volume-selective 3D UTE sequence, termed volume-selective UTE (VS-UTE). Through this, the image quality can be improved by minimizing the streak artifact caused by under sampling in the 3D radial UTE imaging technique. In conclusion, the methods presented in this study can be used to obtain pulmonary magnetic resonance imaging stably under free breathing conditions and to reduce the scan time due to the reduction of streak artifacts in the images even under under-sampling. Therefore, it is expected that early diagnosis and continuous study will be possible in patients with lung disease. 방사형 k-공간 획득을 이용한 3차원 매우 짧은 에코 시간 (UTE) 이미징 기법은 기존의 자기공명영상 기법과 다르게 X-선 및 컴퓨터 단층 촬영(CT)과 비슷한 폐 이미지를 생성하는 잘 알려진 자기공명영상화 기법이다. 3차원 방사형 UTE 이미징 기법은 기존의 직교형 자기공명영상 기법 보다 움직임에 덜 민감하기 때문에 폐 자기공명영상에 적합하지만, 후향적 호흡 게이팅 (gating)을 통해 호흡 움직임으로 인한 아티팩트 (artifact)를 최소화 할 필요가 있다. 본 연구에서는 후향적 호흡 게이팅을 최적화 하기 위한 방법을 제시하고 이를 통하여 향상된 폐 자기공명영상을 제공하는 것을 목적으로 한다. 후향 호흡 게이팅을 위해서는 안정적인 호흡 정보를 획득하는 것이 중요하다. 2장에서는 3차원 방사형 UTE 폐 이미징에서 호흡 게이팅을 위한 안정적인 자체 탐색 (Self-navigation) 방법을 소개한다. 제안된 새로운 자체 탐색 방법은 이중 탐색 에코를 위-아래 (superior-inferior) 방향으로 연속적으로 획득하고 호흡 움직임 추적을 위해 두 번째 탐색 에코를 사용하는 것으로서 k-공간 궤적 순서에 영향을 받지 않아 베이스라인(baseline) 변동이 없는 안정적인 호흡신호를 얻을 수 있다. 3장에서는, 두 가지 단계를 거쳐서 후향 호흡 게이팅 후 균일한 k-공간 샘플 밀도를 유지할 수 있는 3차원 방사형 샘플링 전략을 제안한다. 인터리브 3차원 방사형 샘플링 기능은 각 인터리브가 k-공간을 일관되지 않은 방식으로 샘플링 하도록 궤적을 분할화 하여 설계한다. 그 다음, 인터리브 획득에 대한 최적의 분할 계수는 방사성 인터리브가 후향 게이팅 동안 균일하게 수용되도록 호흡 패턴의 대략적인 모델에 기초하여 도출되었다. 이 두 방법을 통해서, 네비게이션 에코 신호의 베이스라인 변동을 효과적으로 억제하여 정확한 호흡 정보로 개선된 호흡 게이팅을 가능하게 되었고 후향적 호흡 게이팅 후에 게이팅된 데이터가 k-공간에 균일하게 분배되어 비 균일 k-공간 샘플 밀도로 인해 발생하는 아티팩트를 효과적으로 억제 할 수 있었다. 추가적으로, 4장에서는 방사형 획득 MRI에서 줄무늬(streak) 아티팩트를 줄이기 위해 두 가지 방법을 제안한다. 먼저, UTE 영상화 기법에서 짧은 TR 및 짧은 TE로 인한 지방 신호 증가를 억제하기 위해 spectral preparation pulse가 적용 되었다. 두 번째, 3차원 방사형 영상화 기법에서 공간 선택 신호를 획득하는 방법으로 공간선택 UTE(VS-UTE)라고 하는 새로운 공간 선택 3차원 UTE 영상화 기법을 소개 한다. 이를 통해서 3차원 방사형 UTE 영상화 기법에서 언더 샘플링되어 발생하는 줄무늬 아티팩트를 최소화 시켜 영상의 질을 향상시킬 수 있었다. 결론적으로, 본 연구에서 제시한 방법들은 결합하면, 자유 호흡 상태에서 안정적으로 폐 자기공명영상 획득이 가능하게 되고 언더 샘플링에도 영상에서 줄무늬 아티팩트가 감소하게 되어 촬영시간이 단축시킬 수 있다. 따라서, 임상에서 폐 질환 환자를 대상으로 조기진단 및 지속적인 연구가 가능할 것으로 기대된다.

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼