• 한국콘텐츠학회논문지
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• 제6권12호
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• pp.261-268
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• 2006

일반인들이 '3차원업체영상'이라고 알고있는 홀로그램은 1947년 데니스가보 (D.Gabor)가 최초로 발견한 빛의 정보를 기록할 수 있는 특징을 가진 새로운 매체이다. 홀로그램은 물체에서 나오는 두 가지 파장의 간섭결과로서 이룩되는 간섭무늬를 기록하는 것으로 물체의 입체감 표현뿐만 아니라 빛과 공간 조형의 표현이 가능하기 때문에 시각적으로 한층 더 나은 결과를 기대할 수 있다. 홀로그램과 광고의 접목을 가정하여 기존광고매체와 홀로그램광고매체의 시각인지도를 측정 분석하여 홀로그램 광고는 기본방식의 광고보다 시각적 인지도가 높을 것인가에 대하여 알아보고, 하이테크 시대에 부합하는 새로운 광고매체로서, 홀로그램이 소비자에게 시각적으로 주의와 흥미를 유발하는데 우수하여 제3의 시각적 광고매체의 형태로 발전 가능성이 있는지에 대하여 알아본다.

• International Journal of Computer Science & Network Security
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• 제23권5호
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• pp.73-88
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• 2023

Brain tumors can also be an abnormal collection or accumulation of cells in the brain that can be life-threatening due to their ability to invade and metastasize to nearby tissues. Accurate diagnosis is critical to the success of treatment planning, and resonant imaging is the primary diagnostic imaging method used to diagnose brain tumors and their extent. Deep learning methods for computer vision applications have shown significant improvements in recent years, primarily due to the undeniable fact that there is a large amount of data on the market to teach models. Therefore, improvements within the model architecture perform better approximations in the monitored configuration. Tumor classification using these deep learning techniques has made great strides by providing reliable, annotated open data sets. Reduce computational effort and learn specific spatial and temporal relationships. This white paper describes transfer models such as the MobileNet model, VGG19 model, InceptionResNetV2 model, Inception model, and DenseNet201 model. The model uses three different optimizers, Adam, SGD, and RMSprop. Finally, the pre-trained MobileNet with RMSprop optimizer is the best model in this paper, with 0.995 accuracies, 0.99 sensitivity, and 1.00 specificity, while at the same time having the lowest computational cost.

• Nuclear Engineering and Technology
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• 제55권2호
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• pp.769-779
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• 2023

This paper describes an hp-angular adaptivity algorithm in the discrete ordinates method for Boltzmann transport applications with strong angular effects. This adaptivity uses discontinuous finite element quadrature sets with different degrees, which updates both angular mesh and the degree of the underlying discontinuous finite element basis functions, allowing different angular local refinement to be applied in space. The regular and goal-based error metrics are considered in this algorithm to locate some regions to be refined. A mapping algorithm derived by moment conservation is developed to pass the angular solution between spatial regions with different quadrature sets. The proposed method is applied to some test problems that demonstrate the ability of this hp-angular adaptivity to resolve complex fluxes with relatively few angular unknowns. Results illustrate that a reduction to approximately 1/50 in quadrature ordinates for a given accuracy compared with uniform angular discretization. This method therefore offers a highly efficient angular adaptivity for investigating difficult particle transport problems.

• Nuclear Engineering and Technology
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• 제55권10호
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• pp.3844-3853
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• 2023

Although radiation and chemotherapy methods for cancer therapy have advanced significantly, surgical resection is still recommended for most cancers. Therefore, intraoperative imaging studies have emerged as a surgical tool for identifying tumor margins. Intraoperative imaging has been examined using conventional imaging devices, such as optical near-infrared probes, gamma probes, and ultrasound devices. However, each modality has its limitations, such as depth penetration and spatial resolution. To overcome these limitations, hybrid imaging modalities and tracer studies are being developed. In a previous study, a multi-modal laparoscope with silicon photo-multiplier (SiPM)-based gamma detection acquired a 1 s interval gamma image. However, improvements in the near-infrared fluorophore (NIRF) signal intensity and gamma image central defects are needed to further evaluate the usefulness of multi-modal systems. In this study, an attempt was made to change the NIRF image acquisition method and the SiPM-based gamma detector to improve the source detection ability and reduce the image acquisition time. The performance of the multi-modal system using a complementary metal oxide semiconductor and modified SiPM gamma detector was evaluated in a phantom test. In future studies, a multi-modal system will be further optimized for pilot preclinical studies.

• 한국심리학회지 : 문화 및 사회문제
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• 제10권spc호
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• pp.147-175
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• 2004

본 연구에서는 전자오락으로 불리던 오락실 게임에서 인터넷으로 인해 멀티 플레이가 가능한 온라인 게임까지 포함한, 컴퓨터 게임이 아동과 청소년의 발달에 어떤 영향을 주었는지를 개관하였다. 구체적으로 손동작과 같은 운동능력, 시각-운동 측면에서의 영향, 그리고 주의, 공간지각력, 수리적 능력, 문제해결력을 포함한 지각, 인지적 측면에서의 영향을 알아보았다. 그리고 정서와 성격 측면, 그리고 사회성 발달과의 관련성을 살펴보았고, 가장 많이 연구가 이루어진 공격성발달과의 관련성, 특히 일반공격모델(GAM)을 집중적으로 개관하였다. 마지막으로 중독과 관련한 연구들을 소개하면서 컴퓨터 게임 중독 진단 도구의 개발에 관한 언급과 함께, 앞으로의 연구방향에 관해 논의 하였다.

• 대한임베디드공학회논문지
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• 제18권6호
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• pp.303-310
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• 2023

A single vision system limits the ability to accurately understand the spatial constraints and interactions between robots and dynamic workers caused by gantry robots and collaborative robots during production manufacturing. In this paper, we propose a 3D pose registration method for dynamic workers based on a multi-domain vision system for safety monitoring in manufacturing environments. This method uses OpenPose, a deep learning-based posture estimation model, to estimate the worker's dynamic two-dimensional posture in real-time and reconstruct it into three-dimensional coordinates. The 3D coordinates of the reconstructed multi-domain vision system were aligned using the ICP algorithm and then registered to a single 3D coordinate system. The proposed method showed effective performance in a manufacturing process environment with an average registration error of 0.0664 m and an average frame rate of 14.597 per second.

• Journal of Ginseng Research
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• 제48권1호
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• pp.98-102
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• 2024

Background: Ginseng (Panax ginseng Meyer) is a perennial plant belonging to the Araliaceae family that is known to have various beneficial effects including improving memory loss and spatial cognitive ability, and anti-cancer and anti-diabetes activity. Its functional benefits also include improving liver function, regulating blood pressure, stress, and providing antioxidant activity. Usually, various agrochemicals are used in cultivating ginseng preventing from many diseases. Methods: FCGP (field cultivated ginseng in pot) was implemented by imitating MCWG (mountain cultivated wild ginseng). Pesticide analysis of pot cultivation was carried out and the contents of bioactive components such as ginsenoside were also analyzed. Results: FCGP ginsenoside content was higher than that of FCG (field cultivated ginseng) and MCWG. FCGP has been shown to have a relatively high antioxidant effect compared with cultivated ginseng. Conclusion: It was confirmed that ginseng can be grown for 6 years without resorting to use of pesticides. In addition, it was confirmed that effective accumulation of physiologically active ingredients such as ginsenoside is possible. Our result represents FCGP is a novel method of pesticide-free ginseng cultivation

• 한국재료학회지
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• 제34권2호
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• pp.105-110
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• 2024

Scanning probe microscopy (SPM) has become an indispensable tool in efforts to develop the next generation of nanoelectronic devices, given its achievable nanometer spatial resolution and highly versatile ability to measure a variety of properties. Recently a new scanning probe microscope was developed to overcome the tip degradation problem of the classic SPM. The main advantage of this new method, called Reverse tip sample (RTS) SPM, is that a single tip can be replaced by a chip containing hundreds to thousands of tips. Generally for use in RTS SPM, pyramid-shaped diamond tips are made by molding on a silicon substrate. Combining RTS SPM with Scanning spreading resistance microscopy (SSRM) using the diamond tip offers the potential to perform 3D profiling of semiconductor materials. However, damage frequently occurs to the completed tips because of the complex manufacturing process. In this work, we design, fabricate, and evaluate an RTS tip chip prototype to simplify the complex manufacturing process, prevent tip damage, and shorten manufacturing time.

• International journal of advanced smart convergence
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• 제13권3호
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• pp.259-266
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• 2024

One of the most time consuming issues in a city development is the identification of suitable areas for urban infrastructures and proper land uses. Suitability analysis is the process and procedures to find the best available land in given area -that is, the ability of a system to select the needs of users in land use. This paper studied the usage of Geographic Information System technique and methods for the selection of the most appropriate sites for public park in the city of Gwangju. GIS was used as a standard technique to find the best available sites for development in urban areas. For this cause, digital elevation model and spatial data were used to produce different thematic layers by using software Idrisi. Criteria for finding the suitable site for park development were decided to evaluate the land and the followings 4 criteria were selected: on land with less than 3 degrees in slope, outside a 200m buffer around lakes, on land currently designated as forests, and 20ha or greater in size. To meet and measure each criterion, distance and context operators were applied to reclassify the importance of certain weight and Boolean images were generated to meet the criteria. These weights and maps has been combined using ArcGIS tools and the final map was prepared showing the most suitable sites. We may assist city planners and government officials in future development of public facilities including parks and related land use plans at urban level and act as to ensure proper land use planning and management of the urban areas.

• 대한지리학회지
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• 제30권2호
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• pp.188-199
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• 1995

대한지리학회가 1945년 9월 11일에 창립되어 50주년을 맞았다. 이를 기념하기 위하 여 국제지리학술대회를 1995년 10월 13일, 14일 이틀에 걸쳐 서울대학교 교수회관에서 개최 하기로 결정하였다. 이 대회에서 논의될 주제는 분단국토의 현실과 통일국토의 미래상, 21세 기 한국 지리학의 도전, 한국 지리학의 반세기-회고와 전망이라는 3가지가 중심이 된다. 이 번 학술대회를 통하여 2000년에 개최할 IGC서울대회를 성공적으로 이끌 역량을 축적하고, 지리학의 연구내용이 결국 인간생활의 질을 향상시키는데 기여해야만 학문적 영속성과 가치 를 인정받을 수 있다는 진실을 인식하는 계기가 되어야 한다.