• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권8호
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• pp.3384-3398
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• 2020

In recent years, as the environment has become an important issue in dealing with food, energy, and urban development, diverse environment-related applications such as environmental monitoring and ecosystem management have emerged. In such applications, automatic classification of animals using video or sound is very useful in terms of cost and convenience. So far, many works have been done for animal sounds classification using artificial intelligence techniques such as a convolutional neural network. However, most of them have dealt only with the sound of a specific class of animals such as bird sounds or insect sounds. Due to this, they are not suitable for classifying various types of animal sounds. In this paper, we propose a sound classification scheme based on a multi-feature network for classifying sounds of multiple species of animals. To do that, we first collected multiple animal sound datasets and grouped them into classes. Then, we extracted their audio features by generating mixed records and used those features for training. To evaluate the effectiveness of our scheme, we constructed an animal sound classification model and performed various experiments. We report some of the results.

• Asian-Australasian Journal of Animal Sciences
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• 제14권4호
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• pp.567-586
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• 2001

Gastrointestinal tract of ruminants as well as monogastric animals are colonised by a variety of microorganisms including bacteria, fungi and protozoa. Gastrointestinal ecosystem, especially the rumen is emerging as an important source for enrichment and natural selection of microbes adapted to specific conditions. It represents a virtually untapped source of novel products (e.g. enzymes, antibiotics, bacteriocins, detoxificants and aromatic compounds) for industrial and therapeutic applications. Several gastrointestinal bacteria and fungi implicated in detoxification of anti-nutritional factors (ANFs) can be modified and manipulated into promising system for detoxifying feed stuffs and enhancing fibre fermentation both naturally by adaptation or through genetic engineering techniques. Intestinal lactobacilli, bifidobacteria and butyrivibrios are being thoroughly investigated and widely recommended as probiotics. Restriction endonucleases and native plasmids, as stable vectors and efficient DNA delivery systems of ruminal and intestinal bacteria, are increasingly recognised as promising tools for genetic manipulation and development of industrially useful recombinant microbes. Enzymes can improve the nutrient availability from feed stuffs, lower feed costs and reduce release of wastes into the environment. Characterization of genes encoding a variety of commercially important enzymes such as cellulases, xylanases, $\beta$-glucanases, pectinases, amylases and phytases will foster the development of more efficacious and viable enzyme supplements and enzyme expression systems for enhancing livestock production.

• 한국수산과학회지
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• 제50권6호
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• pp.788-798
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• 2017

Antarctic krill Euphausia superba are important components of the Antarctic marine ecosystem both economically and ecologically; to manage this species effectively, their distribution and abundance must be understood. Using the Kwang Ja-Ho (3,012 tonnage), a commercial fishing vessel, we conducted acoustic surveys during April 13-24, 2016, to estimate the distribution and population size of krill around the South Shetland Islands of the Antarctic Continent, We used acoustic techniques based on the dB-difference, a method used mainly to classify of marine species. We found that Antarctic krill were present in numbers over 99% at six survey stations, with the exception of Station 3, where we only found Electrona carlsbergi. There was no difference in cell size due to frequency differences, but echo signals differed between species: 4.7-12.0 dB for Antarctic krill, and -4.1~0 dB for Electrona carlsbergi.

• 환경영향평가
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• 제20권5호
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• pp.663-673
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• 2011

In the face of accelerating biodiversity loss and its significance in our coexistence with nature, biodiversity is becoming more crucial in sustainable development perspective. To estimate biodiversity in the future which provides valuable information for decision making system especially in the national level, a quantitative approach must be studied forehand as a baseline of the present status. In this study, we developed a large-scale map of Plant Species Richness (PSR, typical indicator of biodiversity) for Young-dong and Pyung-chang provinces. Due to the accessibility of appropriate data and advance of modelling techniques, reduction of variables without deteriorating the predictive power is considered by applying Genetic algorithm. In addition, a number of Correctly Classified Instances (CCI) with 10-fold cross validation which indicates the predictive power, was carried out for evaluation. This study, as a fundamental baseline, will be beneficial in future land work as well as ecosystem restoration business or other relevant decision making agenda.

• 한국습지학회지
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• 제14권2호
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• pp.303-315
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• 2012

본 연구는 낙동강 하구 일대 습지의 생태계 특성과 변화를 파악하기 위해 습지목록을 제작하였다. 목록의 기초자료로 Landsat TM(1986년 4월 1일, 1987년 6월 23일, 1997년 6월 18일), Kompsat-2 (2008년 1월 12일) 인공위성 이미지, 항공 LiDAR (2009년 3월 1일) 자료와, 부산시에서 조사한 생물 모니터링 자료를 바탕으로 DB를 구축하였다. 습지목록의 활용방안으로, 시계열별 습지분류도 제작 및 시공간 분석, 경관 패턴 분석, 저서생물 분포 특성 등을 파악해 습지 생태계 관리에 도움이 되도록 하였으며 특히 3차원으로 제작된 습지지도는 습지의 경계설정과 습지의 동적 특성분석에 도움을 주어 이러한 기법들을 잘 활용한다면 우리나라 전역의 습지목록 개발에 이용될 수 있다.

• 공업화학
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• 제27권6호
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• pp.565-572
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• 2016

최근 국내 수질오염에 대한 높은 관심과 개선의 필요성이 요구되는 가운데 물 환경 속의 약물의 잔류는 인체를 포함한 생태계의 약물 내성을 일으킨다는 점에서 지속적인 모니터링의 필요성이 제기되고 있다. 특히 약물 중 큰 비율을 차지하는 항생제의 잔류는 하천을 통해 빠르게 생태계의 내성균 확산을 일으킬 수 있다는 점에서 매우 큰 위험요소라고 할 수 있다. 따라서 본 총설에서는 물 환경 속의 항생제 분석이 실시간으로 가능한 신속한 센싱 플랫폼 기반 기술을 서술하고자 하며 이와 관련한 국내/외 연구현황과 발전가능성 및 그에 따른 산업/경제적 효과에 대해 논의하고자 한다.

• 대한지리학회지
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• 제33권3호
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• pp.435-446
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• 1998

본 논문은 좁은 폭이지만 장거리에 걸쳐있는 지상목적물 (15m 폭에 400km길이)에 대한 새로운 원격탐사 및 GIS기법의 개발을 보고한다 (송유관건설로 파괴된 식생의 복원실태를 모니터링하고자). 비디오는 visual 또는 quantitative해석방식에서 신뢰할만한 정확도를 가지고 복원된 주요식생군락을 분별해냈다. 또한 GIS환경에서 digital change-detection 기법을 통해 복원된 식생의 공간적인 patch dynamics의 분포실태를 평가하는 도구로서 비디오가 아주 유용하게 사용될 수 있음을 보여주었다. 본 연구의 결론은 비디오선형지도화가 송유관선로의 환경감시를 위해 현실운용이 가능한 기술이다는 것이며. 여타의 선형목적물에 대한 환경감시를 위해서도 효율적으로 사용될 수 있음을 보여준다.

• 농촌계획
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• 제11권1호
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• pp.55-65
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• 2005

Eco-village is an alternative community which applies ecological principles to the development of human ecosystem in order to achieve sustainability. Ansolgi village in Korea has been established five years ago, in 1999, by a group of environment conscious families. The author has visited and stayed in the village twice during last two years, for several days each time, and observed and surveyed the changes of physical, social, and cultural aspects of the community. They adopt more environment friendly techniques in building their houses, sewage system, roads and parking, and growing their own foods, and so on. The residents have diverse jobs, many of them outside the village as the village lacks job opportunities. The residents themselves often question the sustainability of the village and reluctant to identity Ansolgi as an eco-village. Most residents joined the community with their own images of an eco-village and find it difficult to reach consensus on what the eco-village should be like and how it should be managed and maintained. Residents wish to get government assistances and professional guidance. This paper concludes it is still very difficulty and problematic to establish an eco-village in Korea.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2019년도 학술발표회
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• pp.412-412
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• 2019

Nature-based solutions (NBS) offer a wide variety of techniques that promote cost-efficient stormwater management practices. In particular, low impact development facilities utilize NBS principles to restore the ecosystem services in a highly-urbanized area. Despite the advancements in these technologies, several considerations should still be addressed to ensure optimum functionality and attainment of desired pollutant removal efficiency a LID facility. This study evaluated the mass flushing characteristics of pollutants in an urban catchment and the efficiency of a small constructed wetland (SCW) in treating urban stormwater runoff. 21 rainfall events from 2010 to 2018 were monitored to determine and quantify stormwater pollutants. The highest pollutant washoff was observed on rainfall depths ranging from 0.1mm to 10mm, whereas events with greater rainfall depths exhibited lower pollutant concentrations due to dilution effect. However, the SCW manifested lower pollutant-removal performance on rainfall depths exceeding 10mm due to the exceedance of the facility's design rainfall. This study is beneficial in assessing the dynamics of pollutant washoff and efficiency of LID facilities subjected under various external factors.

• International Journal of Computer Science & Network Security
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• 제21권9호
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• pp.303-316
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• 2021

Digital content protection has recently become an important requirement in biometrics-based authentication systems due to the challenges involved in designing a feasible and effective user authentication method. Biometric approaches are more effective than traditional methods, and simultaneously, they cannot be considered entirely reliable. This study develops a reliable and trustworthy method for verifying that the owner of the biometric traits is the actual user and not an impostor. Watermarking-based approaches are developed using a combination of a color face image of the user and a mobile equipment identifier (MEID). Employing watermark techniques that cannot be easily removed or destroyed, a blind image watermarking scheme based on fast discrete curvelet transform (FDCuT) and discrete cosine transform (DCT) is proposed. FDCuT is applied to the color face image to obtain various frequency coefficients of the image curvelet decomposition, and for high frequency curvelet coefficients DCT is applied to obtain various frequency coefficients. Furthermore, mid-band frequency coefficients are modified using two uncorrelated noise sequences with the MEID watermark bits to obtain a watermarked image. An analysis is carried out to verify the performance of the proposed schema using conventional performance metrics. Compared with an existing approach, the proposed approach is better able to protect multimedia data from unauthorized access and will effectively prevent anyone other than the actual user from using the identity or images.