• Journal of Internet Computing and Services
• /
• v.25 no.3
• /
• pp.19-25
• /
• 2024

The worldwide aging population trend is causing an increase in the incidence of major retinal diseases that can lead to blindness, including glaucoma, cataract, and macular degeneration. In the field of ophthalmology, there is a focused interest in diagnosing diseases that are difficult to prevent in order to reduce the rate of blindness. This study proposes a deep learning approach to accurately diagnose ocular diseases in fundus photographs using less data than traditional methods. For this, Convolutional Neural Network (CNN) models capable of effective learning with limited data were selected to classify Conventional Fundus Images (CFI) from various ocular disease patients. The chosen CNN models demonstrated exceptional performance, achieving high Accuracy, Precision, Recall, and F1-score values. This approach reduces manual analysis by ophthalmologists, shortens consultation times, and provides consistent diagnostic results, making it an efficient and accurate diagnostic tool in the medical field.

• Journal of Intelligence and Information Systems
• /
• v.24 no.3
• /
• pp.45-66
• /
• 2018

Crowdfunding has become more popular than angel funding for fundraising by venture companies. Identification of success factors may be useful for fundraisers and investors to make decisions related to crowdfunding projects and predict a priori whether they will be successful or not. Recent studies have suggested several numeric factors, such as project goals and the number of associated SNS, studying how these affect the success of crowdfunding campaigns. However, prediction of the success of crowdfunding campaigns via non-numeric and unstructured data is not yet possible, especially through analysis of structural characteristics of documents introducing projects in need of funding. Analysis of these documents is promising because they are open and inexpensive to obtain. We propose a novel method to predict the success of a crowdfunding project based on the introductory text. To test the performance of the proposed method, in our study, texts related to 1,980 actual crowdfunding projects were collected and empirically analyzed. From the text data set, the following details about the projects were collected: category, number of replies, funding goal, fundraising method, reward, number of SNS followers, number of images and videos, and miscellaneous numeric data. These factors were identified as significant input features to be used in classification algorithms. The results suggest that the proposed method outperforms other recently proposed, non-text-based methods in terms of accuracy, F-score, and elapsed time.

• Land and Housing Review
• /
• v.4 no.1
• /
• pp.55-63
• /
• 2013

The remodeling of long-tern public rental housing (LPRH) have been acknowledged followed by the introduction of th Act of the Life Quality Improvement of the Residents in Long-tern Public Housing. Likewise, the feasible direction of LPRH remodeling should be discussed in order to improve the quality of life of the dwellers and housing facilities. Therefore a purpose of this study is to suggest the remodeling types for increasing their quality of life with regard to sustainability of remodeling. To do so this study employs various cases of public housing remodeling from the UK, France and USA and performed quantitative research that was subject to the residents in 9 LPRH in Seoul and Gyeong-gi. The findings of the analysis demonstrate that comprehensive and sustainable remodeling considering both physical and social environment factors are needed, and that the residents have needs of improvement of deteriorated facilities and negative perception of the public on LPRH. With regard to this, seven types of the LPRH remodeling types are drawn on the combination between physical and social environment factors. Thus it is expected that the types will ultimately be able to increase of the quality of the life of the residents and guarantee sustainable remodeling.

• Culinary science and hospitality research
• /
• v.21 no.5
• /
• pp.14-24
• /
• 2015

Fast food restaurants are one of the fastest growing industries in the world. Even though it is an emerging field, there are few studies about the relationship of fast food customer satisfaction about brand value and behavior intention. The current study examined which factor concerning brand value affects to customer satisfaction in fast food restaurants and investigated how customer satisfaction affects the behavior intention. The subjects of this study are current undergraduate students in Busan, South Korea. A self-administrated questionnaire survey was distributed to 528 students who have been to fast-food restaurants in Busan, Korea and 493 questionnaires were used for data analysis. Research findings indicated that food quality, brand image, brand awareness, and brand association through multiple linear regression were significant factors for customer satisfaction. In addition, the result of a simple linear regression showed that customer satisfaction was positively related to behavior intention. This study can provide valuable information and offer specific ways for fast food managers to increase customer satisfaction and behavior intention.

• The Journal of the Korea Contents Association
• /
• v.21 no.9
• /
• pp.88-104
• /
• 2021

The visual expression of deconstructive graphic design influenced by postmodernism differs from the traditional ways of graphic expression that consist of precise images and text and is challenging and highly experimental. The characteristics of the formative nature of such deconstructive graphic design emphasized the importance of the reader as the principal agent of aesthetic experience in the appreciation of works. For this study, a new ideological framework was developed regarding the ambiguity arising due to visual experimentation in deconstructive graphic design, assuming the central theory to be the Reception Theory (Aesthetics of Reception) centering around the recipient who is the reader. The characteristics of Iser's Reception Theory are substituted as a theoretical category and an interpretation of the works of ambiguity in deconstructive graphic design is carried out. Although Aesthetics of Reception is a literary theory about the interaction between the artist and the reader, as a method for interpreting deconstructive graphic design influenced by postmodernism, it laid a theoretical foundation and enriched the interpretation of works. Moreover, the four characteristics of Iser's Reception Theory were used to create a framework that suggested a new direction for the approach based on the reader's interaction in the process of interpreting works of modern graphic design.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 1996.04a
• /
• pp.425-428
• /
• 1996

본 연구에서는 기존문헌에서 논의되어온 수리적 매체선택모형의 한계점을 고려하여 의사결정자에게 유용한 매체선택지침을 제공할 수 있는 모형을 구축하고 이를 실제사례에 적용하여 모형의 현실적용성을 살펴본다. 기존의 매체선택모형들은 가정의 현실성 결여와 특정 요인의 단편적 고려 등으로 인하여 실행상의 문제점을 노출하였다. 최근 매체의 이미지, 소비자에 대한 소구, 편집항목 등 매체현상과 관련된 정성적 요소들을 고려하고자 하는 의도에서 AHP를 매체선택 문제에 활용하고 있으며 이것은 매체선택모형을 보다 현실적인 모형으로 만들고 있다. 또한 AHP에 의해 도출된 매체의 선호정도를 독립적으로 이용하는 것보다 정량적인 요소를 고려한 수리적 모형과 결합하는 것이 보다 효과적인 것으로 이해되고 있으며 이는 매체선택모형의 현실적합성을 한층 증가시키고 있다고 할 수 있다. 이러한 정성적 요소와 정량적 요소를 결합한 매체선택모형은 다양한 의사결정요소들을 모형에 포함시켰다는 의미에서 기존의 모형들과 차별화가 이루어지나 실제 모형을 적용하여 그 효과를 판단하는 것은 광고의 복잡성과 측정상의 문제로 인해서 매우 어려운 일로 보인다. 따라서 매체선택 모형은 더 이상 장량적인 관점에서 최적해를 추구하기 보다는 모형이 광고의 상황과 기업의 전략등에 얼마나 효과적으로 대처하는가에 초점을 맞추는 것이 중요하다. 이에 따라 본 연구에서는 AHP와 정수계획법을 결합한 모형을 이용하여 고려하고자하는 매체선택 관련요소들을 체계화하고 이 모형이 최적해를 산출하는 모형으로서가 아니라 의사결정자에게 매체선택지침을 제시하는 하나의 현실적인 의사결정지원도구로서 역할을 하고 있는가에 초점을 맞춘다. (4) 교수-학생간의 인간적인 관계, (5) 숙제 및 과제물과 같은 5가지의 요인으로 구성되어진 것으로 분석되었다. 특히 한국학생을 대상으로 하여 AHP를 이용하여 각 요인들의 수업효과에 대한 상대적 가중치를 조사하였다. 특이한 결과는, 미국학생의 경우 수업준비 및 강의 방법이 상대적으로 중시된 반면, 한국학생들은 미국학생들이 비교적 덜 중시하는 교수-학생간의 인간적인 관계가 수업효과를 높이는데 가장 큰 기여를 하는 것으로 나타났다. 본 연구는 한국 문화의 특징이라 할 수 있는 교수-학생간의 인간적인 관계가 중시되는 교육환경하에서, 정보화 사회의 한 수업형태인 재택수업을 외국(특히 미국)의 방법을 그대로 따라 실시할 경우, 많은 부작용이 있을 수 있다는 것을 암시하며, 따라서 우리 교육문화에 맞는 재택수업 형태의 개발이 시급함을 제시한다고 하겠다.column density of HCaN is (1-3):n1014cm-2. Column density at distant position from MD5 is larger than that in the (:entral region. We have deduced that this hot-core has a mass of 10sR1 which i:s about an order of magnitude larger those obtained by previous studies.previous studies.업순서들의 상관관계를 고려하여 보다 개선된 해를 구하기 위한 연구가 요구된다. 또한, 준비작업비용을 발생시키는 작업장의 작업순서결정에 대해서도 연구를 행하여, 보완작업비용과 준비비용을 고려한 GMMAL 작업순서문제를

• Cartoon and Animation Studies
• /
• s.14
• /
• pp.165-176
• /
• 2008

In the future there would be many kinds of digital images for many industrial markets. 3D stereoscopic images for variable fields; medical operation, film and animation, broadcasting, internet, game, or design for art and architecture. And many people to work about computer programming, and digital image making will concern about it more and more. However, these kinds works and studies are focused on the professional technical fields like 3D display or computer programming technology so far. To revitalize the market of a variable stereoscopic contents, there should build up the foundation for easy processing of the making stereoscopic images. This paper is based on stereoscopic making skills for anaglyph system. An anaglyph system has an old history about making stereoscopic images, and very simple method to produce the stereoscopic images. Particularly this study is focused on color compositing technique, and camera positioning on the compositing system. It will help optimization of the environments to create 3D motion graphic and animation contents.

• Journal of Korean Ophthalmic Optics Society
• /
• v.20 no.3
• /
• pp.391-396
• /
• 2015

Purpose: The objective of this study was to investigate the visual system of the greater horseshoe bat (Rhinolophus ferrumequinum) by location analysis of some major neurotransmitters glutamate, ${\gamma}$-aminobutyric acid (GABA), acetylcholine, and their receptors, and $m{\ddot{u}}ller$ glial cells in retina. Methods: Standard immunocytochemical techniques were used after vibratome section of retinal tissues of adult greater horseshoe bat for this study. Immnoreactions in immunofluorescence images were analyzed using confocal microscope. Results: Anti-glutamate-immunoreactive neurons were mainly localized in the ganglion cell layer (GCL). The majority of anti-GABA-immunoreactive cells distributed in the inner nuclear layer (INL), and GABAA receptors were localized in the inner plexiform layer (IPL). Anti-choline acetyltransferase-immuoreactive cholinergic neurons were mainly located in the INL and GCL, and most of nicotinic acetylcholine receptors were localized in the IPL. The $m{\ddot{u}}ller$ cells in the retina of the greater horseshoe bat stretched theirs range from the GCL to outer nuclear layer (ONL). Conclusions: This study revealed that the retinas of the greater horseshoe bats contain the same major neurotransmitters and receptors, and glial cell in visually functional mammalian retinas. The present results may suggest that the greater horseshoe bats have the functional retinas for visual analysis through the organized retinal neural circuits.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2014.02a
• /
• pp.427-428
• /
• 2014

서론: 최근 전세계적인 고령화 진행에 따른 뇌졸중, 파킨슨병, 알츠하이머병 등과 같은 각종 뇌관련 질환에 대한 관심이 더욱 높아지고 있으며 다양한 뇌질환 치료를 위하여 뇌 신경 신호의 정확한 검출 대한 연구가 학계에서 활발히 진행되고 있다. 효과적인 뇌 신경 신호 검출을 위해서는 세포조직의 손상을 최소화 할 수 있는 초소형 신경탐침 및 극소 면적내에서 극대화된 검출 전극이 구현되어야 한다. 그러나, 극소 면적내에 구성된 소면적 전극을 통한 신호 검출은 전극 계면에서의 높은 임피던스를 야기시켜 정밀한 신경신호 검출에 어려움을 만든다. 따라서, 뇌 신경 신호 검출시 전극 계면에서의 낮은 임피던스를 검출하기 위한 다결정실리콘, 이리듐 산화막, 탄소나노튜브와 같은 다양한 전극 소재를 이용한 신경탐침 연구가 제안되어 왔다. 본 연구에서는 극소화된 전극면적과 신경세포 계면에서의 저 임피던스 신경신호 검출을 위하여 비이온성 계면활성제와 전해도금을 이용하여 높은 거칠기값을 갖는 나노동공 백금층을 검출 전극으로 활용하였다. 실험 결과: 제작된 신경탐침의 몸체는 실리콘으로 이루어지며, 탐침 끝단에는 신호 측정을 위한 나노동공 백금층을 갖는 전극들이 집적되어 있다. Fig. 1 는 제작된 나노동공 백금을 갖는 신경탐침의 이미지 (a), SEM (b), TEM (c), FESEM (d) 측정결과를 보여준다. 0.9 %의 NaCl 용액에서 제작된 신경탐침의 계면임피던스 및 위상각 변화에 대한 측정결과가 Fig. 2에 나타나 있다. 1.2 kHz 주파수에서 $942.6K{\Omega}$ ($0.029{\Omega}cm^2$, $3.14{\mu}m^2$)로 극대화된 실표면적을 갖는 나노동공 백금층에 의하여 매우 낮은 임피던스 특성을 보인 것으로 판단된다. 또한 제작된 신경탐침은 위상각이 $-82.9^{\circ}$로서 캐패시터와 같은 역할을 하고 있다고 예상할 수 있었으며 $4.6mFcm^{-2}$의 축전용량값을 보였다. Fig. 3는 1 M의 황산용액에서 나노동공백금층이 형성된 신경탐침 전극과 형성 전의 전기화학적 표면변화를 비교분석한 결과로서 나노동공 백금층의 형성 전/후의 전류응답 특성이 상이하게 나타났다. 나노동공 백금층의 실표면적 극대화로 인한 전류응답수치 또한 크게 향상 되었으며, 0~-0.25 V 영역에서의 수소 흡착에 따른 환원곡선은 전형적인 백금 특성을 보여주는 결과로 판단 할 수 있다. Table 1는 기존에 연구되었던 신경탐침들과 본 연구에서 제작된 나노동공 백금을 갖는 신경탐침의 임피던스와 캐패시턴스 특성을 비교한 결과이다. 결론: 본 연구에서는 실리콘 신경탐침 끝단에 집적된 전극상에 전해도금법을 이용하여 높은 거칠기값을 갖는 나노동공 백금층을 형성하고 전극 계면상의 낮은 임피던스를 검출을 하였다. 나노동공 백금층을 갖는 신경탐침은 순환전압전류법을 통해 극대화된 실표면적을 극대화를 확인할 수 있었으며, 극대화된 검출 전극면은 저 임피던스 측정에 용이함을 실험을 통해서 증명할 수 있었다. 따라서, 높은 거칠기값의 나노동공 백금층은 초소형화된 신경탐침상에 집적되는 전극면적소형화와 다수의 전극 구현에 효과적일 것으로 판단되며 보다 정확한 신경신호 검출을 통한 뇌질환의 명확한 이해에 유망할 것으로 판단된다.

• Conservation Science in Museum
• /
• v.16
• /
• pp.4-13
• /
• 2015

In most gold objects crafted using the granulation technique that have been thus far discovered in the Korean Peninsula, granules were joined using a soldering alloy of gold and silver. However, it was recently revealed through SEM-EDS analysis performed on the ornamented dagger sheath from Gyerim-ro Tomb No.14 in Gyeongju that the gold granules were joined to the surface of this sheath using an entirely different technique. The gold granules on the Gyerim-ro dagger sheath are evenly sized and shaped, the surface has a dendritic texture. Dendritic textures are a characteristic feature of metal alloys, not observed in pure metals. As a matter of fact, the gold granules were made of a ternary alloy of 77wt% Au, 18wt% Ag and 4wt% Cu. Due to this component, the alloy has a melting point below 1000℃ (approximately 980℃), which is significantly lower than 1064℃, the melting temperature of pure gold. This makes it possible to join the gold granules directly to the surface of the sheath by briefly heating them to high temperature, without the use of soldering or any other media. When examined through SEM image, the surface of the sheath showed no traces of soldering, it suggests that the granules were joined through unaided fusion.