• 한국정보통신학회논문지
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• 제26권7호
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• pp.972-980
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• 2022

영상을 이용한 기계학습 기반의 나비 종 인식 기술은 나비 종의 다양성 및 개체 수, 종의 서식 분포 등을 파악하는데 관련 분야 종사자의 많은 시간과 비용 감소의 효과를 가져온다. 나비 종 분류의 정확성과 시간 효율을 높이기 위해 기계학습 모델의 입력으로 사용되는 여러 가지 특징들이 연구되었다. 그중 엔트로피 개념을 이용한 가지 길이 유사성 엔트로피나 색채 강도 엔트로피 방법이 푸리에 변환이나 웨이블릿 등 다른 특징들에 비해 높은 정확성과 적은 학습 시간을 보여주었다. 본 논문은 나비의 컬러 영상에 대한 RGB 색채 강도 엔트로피를 이용한 특징 추출 알고리즘을 제안한다. 또한 제안한 특징 추출 방법과 대표적인 앙상블 모델들을 결합한 나비 인식 시스템을 개발하고 성능을 평가한다.

• 한국동물학회지
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• 제2권1호
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• pp.34-34
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• 1959

The authors has recorded one nymphalid butterfly from Quelpart Island , Korea : Prcis orithya LINNE.

• 대한조선학회논문집
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• 제43권5호
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• pp.611-618
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• 2006

Recently, cryogenic butterfly valves for LNG carriers are actively developed by ship equipment companies. The dual core structure unlike usual butterfly valve has both translation and gyration motions of the disk of the valve assembly. Especially, the ship equipment companies can not have overcome 2D design method; in addition, even though 2 years of development has passed, the drawing cannot be secured. In this research, for the cryogenic butterfly valves and the product design, 3D design method was introduced and DMU(Digital Mockup) was applied to complement the problems in 2D design and investigate application possibility of 3D design method.

• 한국유체기계학회 논문집
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• 제16권5호
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• pp.29-35
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• 2013

Butterfly valve seated rubber has been widely used in water works and industrial fields because it has advantages which are small installation area and low weight. The size and material of butterfly valve have been selected by service environments and purposes. But there are out of the ordinary to find papers for the life characteristics of the butterfly valve. So, this study carries out the accelerated life test, which has an acceleration factor with pressure, using performance and life test equipment. Accelerated model is adopted with 3 stress level and the inverse power law model to estimate the life of the test samples. After the analysis of the test result, accelerated index has 7.0 and the acceleration factor has 208 which is applied with field condition with the pressure 6.3 bar.

• 한국응용곤충학회지
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• 제53권4호
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• pp.347-354
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• 2014

본 연구는 개벌 후 나비군집의 변화를 파악하기 위해서 실시하였다. 조사는 2011년 개벌지, 임도, 산림에서 5월부터 11월까지 선조사법을 실시했다. 조사결과, 총 32종 398개체의 나비가 관찰되었다. 먹이생태지위 범위와 서식처 유형에서의 나비 개체수는 개벌지가 산림보다 유의하게 높았다. 나비의 종수와 종다양도는 개벌지가 산림에 비하여 유의하게 높았다. 개벌지에서 환경부 취약종 기생나비와 은점표범나비의 많은 개체가 확인되었다. 본 연구결과, 개벌로 인하여 형성된 초지는 산림생태계에서 나비의 다양성을 높이는 중요한 역할을 한다.

• 한국소음진동공학회논문집
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• 제14권2호
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• pp.119-127
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• 2004

Butterfly valves are popularly used in service in the industrial and water works pipeline systems with large diameter because of its lightweight, simple structure and the rapidity of its manipulation. Sometimes cavitation can occur. resulting in noise, vibration and rapid deterioration of the valve trim, and do not allow further operation. Thus, the monitoring of cavitation is of economic interest and is very importance in industry. This paper proposes a condition monitoring scheme using statistical feature evaluation and support vector machine (SVM) to detect the cavitation conditions of butterfly valve which used as a flow control valve at the pumping stations. The stationary features of vibration signals are extracted from statistical moments. The SVMs are trained, and then classify normal and cavitation conditions of control valves. The SVMs with the reorganized feature vectors can distinguish the class of the untrained and untested data. The classification validity of this method is examined by various signals that are acquired from butterfly valves in the pumping stations and compared the classification success rate with those of self-organizing feature map neural network.

• 한국기계기술학회지
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• 제13권1호
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• pp.81-88
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• 2011

The triple eccentric butterfly valve has metal sheet and this study about butterfly valve ceiling is an innovative approach. But it is affected by the static pressure as well as cross-current. The damage at the valve on the pipe resulted from the reflux is due to valve leakage. This study is investigated on the triple eccentric disk and it is applied with angle and the static pressure in all cases to develop cross-current triple eccentric butterfly valves. The disc with the diameter of 300A is valve against flow velocity. The entrance pressure by flow characteristics is performed with numerical analysis. As the result, valve torque production is reduced more than the conventional triple eccentric valve and entrance pressure is decreased on the increase of valve open angle. And flow coefficient can be known to be increased.

• 패션비즈니스
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• 제23권4호
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• pp.24-37
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• 2019

This study focused on the fashion designer brand 'Alexander McQueen' to determine how butterflies are used in modern fashion through the sensibilities of certain designers. To this end, both a literature review and empirical research were conducted. First, we examined the origin of the word and appearance characteristics of butterflies based on prior research and a book, and also surveyed the tendencies used by the fashion designer brand Alexander McQueen. Second, out of 239 items announced by the fashion designer brand "Alexander McQueen" RTW (Ready to Wear) ranging from the S/S Collection in 2008 to the 2018-9 F/W collection, 73 pieces deemed to be fashion using butterfly images were collected through www.samsung.net and www.firstview.com, then analyzed based on timing and aesthetic characteristics. Results. The analysis by time period was divided into fantasy, handicraft, mix and match, and aesthetic characteristics shown in the order of compromise beauty, rhythmical beauty, and voluptuous beauty. The purpose of this study was to determine how butterflies are expressed in fashion based on the sensibility of a specific designer in modern fashion, the fashion designer brand 'Alexander McQueen'. Based on the results of this study, we hope that the information presented herein on fashion of natural images will serve as a basic material for similar research or design ideas as an example of designs based on butterfly images.

• Journal of Ecology and Environment
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• 제45권4호
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• pp.182-189
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• 2021

Background: Organism body size is a basic characteristic in ecology; it is related to temperature according to temperature-size rule. Butterflies are affected in various aspects by climate change because they are sensitive to temperature. Therefore, this study was conducted to understand the effect of an increase in temperature due to global warming on the wing of butterflies. Results: A total of 671 butterflies belonging to 9 species were collected from 1990 to 2016 in Seoul (336 specimens) and Mokpo (335 specimens). Consequently, as the mean temperature increased, the wing length of the species increased. However, there are exceptions that the Parnassius stubbendorfii, Pieridae canidia, and Pieris rapae wing length of Seoul increased, but the butterfly wing length of Mokpo decreased. Conclusions: The positive correlations between the butterfly wing length and mean temperature showed that the change of mean temperature for about 26 years affects the wing length of butterfly species. The exception is deemed to have been influenced by the limited research environment, and further studies are needed. We would expect that it can be provided as basic data for studying effect of climate change.

• Journal of Audiology & Otology
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• 제23권3호
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• pp.140-144
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• 2019

Background and Objectives: Inlay butterfly cartilage tympanoplasty makes the graft easy, and reduces operating time. The present study aimed to investigate the outcomes of microscopic versus endoscopic inlay butterfly cartilage tympanoplasty. Subjects and Methods: In this retrospective study, the outcomes of 63 patients who underwent inlay butterfly cartilage tympanoplasty with small to medium chronic tympanic membrane perforation were evaluated. Twenty-four patients underwent conventional microscopic tympanoplasty and 39 underwent endoscopic tympanoplasty. The outcomes were analyzed in terms of the hearing gain and graft success rate. Results: The surgical success rate was 95.8% in the patients who underwent conventional microscopic tympanoplasty and 92.3% in those who underwent endoscopic tympanoplasty. In both groups of patients, the postoperative air-bone gap (ABG) was significantly lower than the preoperative ABG. There were no significant differences between the preoperative and postoperative ABG values in either group. Conclusions: Endoscopic inlay tympanoplasty using the butterfly cartilage technique appears to be an effective alternative to microscopic tympanoplasty and results in excellent hearing.