• 원예과학기술지
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• 제29권3호
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• pp.240-246
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• 2011

The principal objective of this study was to estimate the availability of morphological data on the basis of the guidelines of the International Union for the Protection of New Varieties of Plants (UPOV) with regard to the identification of the rose germplasm. The correlation of morphological traits and random amplified polymorphic DNA (RAPD) marker data among 44 rose cultivars was assessed via a mantel test. Thirty eight phenotypes were employed for morphological analysis. Sixteen primers were utilized for RAPD analysis, and these generated 225 polymorphic bands. The dendrogram based on the RAPD markersgrouped 44 rose cultivars according to their horticultural types. No significant correlation was observed between the morphological and RAPD marker data. We concluded that current UPOV traits could not be applied to study genetic variation. Further studies on morphological traits are required for the analysis of genetic variation among cultivars.

• 대한원격탐사학회지
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• 제39권6_3호
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• pp.1693-1705
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• 2023

국토 면적의 약 90%를 차지하는 농촌은 여러가지 공익적 기능을 수행하는 공간으로서 중요성과 가치가 증가하고 있지만 주거지 인근에 축사, 공장, 태양광패널 등 주민생활에 불편을 미치는 시설들이 무분별하게 들어서면서 농촌 환경과 경관이 훼손되고 주민 삶의 질이 낮아지고 있다. 농촌지역의 무질서한 개발을 방지하고 농촌 공간을 계획적으로 관리하기 위해서는 농촌지역 내 위해시설에 대한 탐지 및 모니터링이 필요하다. 주기적으로 취득 가능하고 전체 지역에 대한 정보를 얻을 수 있는 위성영상을 통해 데이터의 취득이 가능하고, 합성곱 신경망 기법을 통한 영상 기반 딥러닝 기술을 활용하여 효과적인 탐지가 가능하다. 따라서 본 연구에서는 의미적 분할(Semantic segmentation)에서 높은 성능을 보이는 U-Net 모델을 이용하여 농촌 지역에서 잠재적으로 위해시설이 될 수 있는 농촌시설을 분류하는 연구를 수행하였다. 본 연구에서는 2020년에 제작된 공간해상도 0.7 m의 KOMPSAT 정사모자이크 광학영상을 한국항공우주연구원으로부터 제공받아 사용하였으며 축사, 공장, 태양광 패널에 대한 AI 학습용 데이터를 직접 제작하여 학습 및 추론을 진행하였다. U-Net을 통해 학습시킨 결과 픽셀 정확도(pixel accuracy)는 0.9739, mean Intersection over Union (mIOU)은 0.7025의 값을 도출하였다. 본 연구 결과는 농촌 지역의 위험 시설물 모니터링에 활용될 수 있으며, 농촌계획 수립에 있어 기초 자료로 활용될 수 있을 것으로 기대된다.

• Bulletin of the Korean Chemical Society
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• 제31권11호
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• pp.3228-3232
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• 2010

Malachite green (MG) has been used world-widely in aquaculture as a parasiticide or fungicide. Although MG performed successfully, it has not been permitted for use in aquaculture from European Union, USA, and Canada because of its carcinogenicity and mutagenicity. We developed a sensitive and specific method to determine MG and its principal metabolite, leucomalachite green (LMG), respectively by isotope dilution liquid chromatography mass spectrometry (ID-LC/MS). To enhance the extraction recovery of MG and LMG from fish tissue, an additional step, saponification, was introduced in sample preparation process to remove fat in sample extract, which hampered the performance of SPE columns. The residue of MG and LMG in fish was analyzed using liquid chromatography mass spectrometry in the selected ion monitoring (SIM) mode by monitoring at m/z 329 and 334 for MG and $d_5$-MG and at m/z 331 and 337 for LMG and $^{13}C_6$-LMG, respectively. This method was validated by comparing with the value of the reference material provided by Laboratory Government Chemistry (LGC). The results agreed within the measurement uncertainty and the accuracy was much improved than the provided reference value by LGC.

• 신재생에너지
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• 제18권3호
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• pp.72-84
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• 2022

As the threat of climate change escalates, 'net-zero' has become a priority for the international community, and the use of new and renewable energy sources is expected to play a significant role in reaching international carbon neutrality. Here, we evaluate technological competitiveness in terms of implementation and technology by analyzing scientific literature and patents in the new and renewable energy fields of five major countries. For the past 10 years (2009-2019), the most active areas of new and renewable energy research and development have been solar power, wind power, waste, and fuel cells. China is the forerunner in implementation, whereas the United States has the most advanced technology. Portfolio analysis revealed that Korea's fuel cell, the United States' bioenergy, China's waste, Japan's solar and fuel cell, and the European Union's wind power have shown to be in Star Field respectively. Technological competitiveness analysis found that Korea is lagging behind other countries in the new and renewable energy sector, and needs to set a new direction for future carbon-neutral research and development, investment, and policy.

• 스마트미디어저널
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• 제11권7호
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• pp.94-103
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• 2022

Weeds bring disadvantages to crops since they can damage them, and a clean treatment with less pollution and contamination should be developed. Artificial intelligence gives new hope to agriculture to achieve smart farming. This study delivers an automated weeds growth point detection using deep learning. This study proposes a combination of semantic graphics for generating data annotation and U-Net with pre-trained deep learning as a backbone for locating the growth point of the weeds on the given field scene. The dataset was collected from an actual field. We measured the intersection over union, f1-score, precision, and recall to evaluate our method. Moreover, Mobilenet V2 was chosen as the backbone and compared with Resnet 34. The results showed that the proposed method was accurate enough to detect the growth point and handle the brightness variation. The best performance was achieved by Mobilenet V2 as a backbone with IoU 96.81%, precision 97.77%, recall 98.97%, and f1-score 97.30%.

• 대한의용생체공학회:의공학회지
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• 제44권5호
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• pp.354-361
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• 2023

Most of spinal diseases are diagnosed based on the subjective judgment of a specialist, so numerous studies have been conducted to find objectivity by automating the diagnosis process using deep learning. In this paper, we propose a method that combines segmentation and feature extraction, which are frequently used techniques for diagnosing spinal diseases. Four models, U-Net, U-Net++, DeepLabv3+, and M-Net were trained and compared using 1000 X-ray images, and key-points were derived using Douglas-Peucker algorithms. For evaluation, Dice Similarity Coefficient(DSC), Intersection over Union(IoU), precision, recall, and area under precision-recall curve evaluation metrics were used and U-Net++ showed the best performance in all metrics with an average DSC of 0.9724. For the average Euclidean distance between estimated key-points and ground truth, U-Net was the best, followed by U-Net++. However the difference in average distance was about 0.1 pixels, which is not significant. The results suggest that it is possible to extract key-points based on segmentation and that it can be used to accurately diagnose various spinal diseases, including spondylolisthesis, with consistent criteria.

• Clinical Endoscopy
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• 제55권4호
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• pp.489-495
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• 2022

An appropriate post-polypectomy surveillance program requires the effectiveness of reducing colorectal cancer and safety. In addition, the post-polypectomy surveillance program should consider the burden of limited medical resource capacity, cost-effectiveness, and patient adherence. In this sense, a risk-stratified surveillance program based on baseline colonoscopy results is ideal. Major international guidelines for post-polypectomy surveillance, such as those from the European Union and the United States, have recommended risk-stratified surveillance programs. Both guidelines have recently been updated to better differentiate between high- and low-risk individuals. In both updated guidelines, more individuals have been downgraded to lower-risk groups that require less frequent or no surveillance. Furthermore, increased attention has been paid to the surveillance of patients who undergo serrated polyp removal. Previous guidelines in Japan did not clearly outline the risk stratification in post-polypectomy surveillance. However, the new colonoscopy screening and surveillance guidelines presented by the Japan Gastroenterological Endoscopy Society include a risk-stratified post-polectomy surveillance program. Further discussion and analysis of unresolved issues in this field, such as the optimal follow-up after the first surveillance, the upper age limit for surveillance, and the ideal method for improving adherence to surveillance guidelines, are warranted.

• 한국식품위생안전성학회지
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• 제19권3호
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• pp.140-150
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• 2004

It has been recognized that international food standards should be considered for a long time. The Codex Alimentarius programme initiated in the early 1960s has received valuable background documentation from the ICMSF (International Commission on Microbiological Specification for Foods) and also from ISO(the International Organization for Standardization). There has been a considerable move towards international harmonization of standards and methods of analysis. Many foreign countries recommend the guidelines for food microbiological standards quantitatively. To complement microbiological limits and tolerance levels for permissible number of defective samples, allowances should be made for sampling and other variations in laboratory methods. It may be necessary for guidelines of domestic food microbiological standards to be established so that the domestic food standards can be harmonized with foreign food standards. Food safety related microbiological guidelines of ICMSF, EU (European Union), UK (United Kingdom), China (Hong Kong) and Japan were reviewed and shown in examples.

• Carbon letters
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• 제14권3호
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• pp.180-185
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• 2013

In this study, activated carbons nanofibers (ACNFs) were prepared from polyacrylonitrile-based nanofibers by physical ($H_2O$ and $CO_2$) and chemical (KOH) activation. The surface and structural characteristics of the porous carbon were observed by scanning electron microscopy and X-ray diffraction, respectively. Pore characteristics were investigated by $N_2$/77K adsorption isotherms. The specific surface area of the physically ACNFs was increased up to $2400m^2/g$ and the ACNFs were found to be mainly composed of micropore structures. Chemical activation using KOH produced ACNFs with high specific surface area (up to $2500m^2/g$), and the micropores were mainly found in the ACNFs. The physically and chemically ACNFs showed both mainly type I from the International Union of Pure and Applied Chemistry classification.

• 방송공학회논문지
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• 제22권2호
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• pp.214-233
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• 2017

신체적 감각적 제약이 있는 장애인들에게 방송 시청은 정보 습득 및 여가 생활의 주요 수단이다. 최근 방송통신의 융합, 방송의 디지털 모바일화, 이용자의 능동적인 미디어 이용행태 증가 등 미디어 환경의 변화는 장애인의 방송 접근성을 어렵게 하고 있으며 그 결과, 비장애인과의 정보격차가 커지고 있는 현실이다. 이에 2011년 7월 방송법의 개정으로 장애인방송 접근권 보장에 관한 고시가 제정되고 2013년 국가정보화기본법의 개정으로 웹 접근성 지침의 효력이 커지면서 시청각 장애인의 미디어접근권의 법적 근거가 마련되었다. 하지만 장애인을 위한 미디어 서비스는 여전히 양적 질적으로 부족한 현실이다. 본 연구에서는 시각장애인들의 미디어 접근에 필요한 해설오디오 서비스의 제공 현황을 알아보고 100명의 시각장애인들을 대상으로 실시한 해설오디오 서비스의 활용 실태, 만족도 및 개선 요구사항 등에 대한 설문조사 결과를 분석한다.