• 수산해양기술연구
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• 제51권3호
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• pp.448-453
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• 2015

This study was performed to estimate biomass and to provide management plan through population ecological characteristics, including survival rate, instantaneous coefficient of natural and fishing mortalities, and age at first capture of Flathead grey mullet, Mugil cephalus, in the coastal waters of Yeosu. Survival rate (S) of the flathead grey mullet was 3.671. The instantaneous coefficients of natural mortality (M) and fishing mortality (F) was estimated to be 0.325/year, 0.962/year for flathead grey mullet. Also fist capure age of flathead grey mullet was 3.61year. The current biomass of the flathead grey mullet in the study area was estimated to be 19.6 M/T and $F_{0.1}$ and $F_{40%}$ were estimated 0.340/year, 0.225/year. For the stock assessment result, flathead grey mullet was not overfished but overfishing.

• 대한교통학회지
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• 제28권4호
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• pp.141-156
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• 2010

본 연구에서는 기존의 차량 및 보행환경의 평가에 있어서 종합적이고 통합적인 접근방식에 한계가 있다고 진단하고, 이를 고려하는 평가 방법 개발에 중점을 두었다. 여기에서의 통합적인 평가라 함은 차량환경과 보행환경에서 쓰이고 있는 수단별 평가 지표에 대한 통합과 더불어, 공간적 개념에서 선/축의 평가방식을 포함한 면적인 차원의 평가라 할 수 있겠다. 본 연구에서는 통합 평가를 위한 이론적 배경으로 Grey System Theory(GST)를 적용하였으며, 대상지역은 보행우선구역 시범사업지로 하여 차량 및 보행환경에 대한 평가를 수행하였다. GST에 의한 종합평가 및 분석결과, 같은 서비스수준 또는 상대적으로 차량 및 보행환경의 운영지표상(도로용량편람)에서는 보다 양호한 상태라 할지라도 관측된 데이터가 Grey Category 범위에 따라 통합 평가시에는 평가지표 간 가중치 등이 고려되어 산정되었기에 Category 상에서의 종합점수는 달라지는 것을 알 수 있었다. 이러한 점을 종합적으로 고려해 볼 때, 도로운영상의 지표들이 상대적으로 좋다고 하더라도 안전상의 지표들이 나쁠 경우에는 그에 따라Grey Category상의 점수들도 변화하는 것을 알 수 있었으며, 본 평가방법을 통해 향후 도시가로 형태별로 현재 상태를 진단할 뿐 아니라 노선별(축별), 면적인 개념에서의 평가와 더불어 평가지표간 통합평가가 이루어 질 것으로 기대하고 있다.

• 한국정보통신학회논문지
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• 제17권1호
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• pp.204-209
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• 2013

영상매체의 발전으로 영상처리가 여러 분야에 적용되고 있으며, 영상의 밝기가 급격히 변화하는 경계 부분은 에지가 중요한 정보와 특징을 포함하므로 영상의 특징을 분석함에 있어서 중요한 요소이다. 이러한 에지를 검출하기 위한 많은 연구가 계속되어 왔으며, 기존의 에지 검출 방법은 인접한 화소 사이에 대한 관계를 이용하여 수행 속도는 우수하나, 휘도 변화를 고려하지 않는 고정된 마스크를 이용하므로 에지검출 특성이 다소 미흡하다. 따라서 본 논문에서는 마스크의 휘도 변화를 이용한 새로운 알고리즘을 제안하였다.

• 유통과학연구
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• 제11권9호
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• pp.35-42
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• 2013

Purpose - The objective of this paper is to identify how different incentive factors influence teachers with different ages and professional titles at LinYi University, China. Research design, data, and methodology - A total of 435 university teachers participated in the study, and the Grey Correlation Degree Analysis method was used to analyze the sample data. Results - The results indicated that teachers with different professional titles and ages have different levels of preference on various incentive factors. Young and assistant-level teachers seem to place more importance on incentives than associate and senior-level teachers. Conclusions - This study has some practical implications. First, the principal and school administrators should pay more attention to young and middle-aged teachers and to how these teachers are motivated through monetary incentives as compared to associate or senior-level teachers. Second, school administrators should pay more attention to teachers' opportunities for career growth and should provide more opportunity for academic promotion. In order to stimulate positivity in teachers, school administrators should adopt various incentive systems.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.921-923
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• 2015

영상에서 에지는 물체의 크기, 방향, 위치 등의 정보를 포함한다. 이러한 에지를 검출하기 위한 기존의 에지 검출 방법은 Sobel, Prewitt, Roberts, Laplacian 등을 이용한 방법이다. 이러한 기존의 방법은 에지 검출하기 위하여 고정된 가중치 마스크를 이용하며 에지 검출 특성이 다소 미흡하다. 따라서 이와 같은 기존의 방법의 문제점을 보완하기 위하여, 본 논문에서는 국부 마스크의 화소 분포에 따라 그레이 레벨 변환 함수를 적용하여 에지를 검출하는 알고리즘을 제안하였다.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1990년도 하계종합학술발표회 논문집
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• pp.443-447
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• 1990

• 한국광학회:학술대회논문집
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• 한국광학회 1996년도 Advance Program of 13th optics andquantum Electronics conference, 1996제13 회 광학 및 양자전자 학술 발표회 논문 요약집
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• pp.72-72
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• 1996

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.616-619
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• 2009

Color tracking behavior of in the fringe-field switching (FFS) mode using a liquid crystal with positive dielectric anisotropy has been studied. In the in-plane switching and vertical alignment devices, color chromaticity at normal direction changes from bluish to yellowish white linearly with increasing grey levels from dark to white state. Interestingly, abnormal behavior in color tracking is observed in FFS devices using a liquid crystal with positive dielectric anisotropy, that is, it changes from bluish to yellowish up to a certain middle grey level but turns over to bluish white with further increasing from a grey level to a fully white state. In this paper, we analyze this abnormal effect from the calculated and experimental results.

• Parasites, Hosts and Diseases
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• 제59권5호
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• pp.537-542
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• 2021

This study intended to record a species of feather mite, Neopteronyssus bilineatus Mironov, 2003, (Arachnida: Pteronyssidae), from a grey-capped pygmy woodpecker, Yungipicus canicapillus (Blyth, 1845), in the Republic of Korea. Mite samples were collected from the flight feathers of a woodpecker, preserved directly in 95% ethyl alcohol, and then observed by a light microscope after specimen preparation. Morphology of Neopteronyssus bilineatus is distinguished from other pici group species by opisthosoma part with 2 longitudinal bends, tarsal seta rIII 3 times longer than tarsus III in males, and 2 elongated hysteronotal plates extending beyond the level of setae e2 in females. In the present study, a species of feather mite, N. bilineatus, was newly recorded from Y. canicapillus in Korean fauna.

• Journal of Periodontal and Implant Science
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• 제25권1호
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• pp.67-75
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• 1995

The progress of periodontal disease and the wound healing process after treatment result in alveolar bone bone change. So, detection of it is very important in the diagnosis and the radiograph of periodontal disease. Various effects have been made to assess the subtle alveolar bone change and digital subtraction radiography (DSR) has been reported to be the best method in evaluating it qualitatively and quantitatively. The present study was performed to estimate the detectable alveolar bone change qualitatively with digital subtraction radiography. For the in vitro study, 10 intraoral standard radiographs were taken from porcine dry mandible which a rectangular cortical bone chip of 0.1mm to 1.0mm thickness with 0.1mm increment was attached on the buccal surface. The radiographs without and with bone plates were reviewed at the same time by 10 observers and requested to detect the presence of cortical bone plates. Digital Subtraction radiograph was reviewed subsequently by using the DSR system(digital converter-256 grey-levels,DT 2851,Data Translation Co., U.S.A;IBM 386 ; CCD camera, FOTOVIX, Tamrom Co., Japan). The detectable thickness of cortical bone plate was O.4mm on the intraoral radiograph and 0.2mm on the subtaction images. For the human study, radiographs were taken from patients by using intraoral film holding device and aluminum reference wedge before and 3 month after bone graft and 1 week after osteoplasty. The grey level change was estimated in the subtraction images and calculated to aluminum equivalent thickness. The grey level of the grafted site was higher that that of healthy controls. Average grey levels of change on healthy controls were O.48mm aluminum equivalent. However, the amount of changes in grafted sites were 1.87mm aluminum thickness equivalent and in the site of osteoplasty were -1.49mm aluminum thickness equivalent. In conclusion, digital subtraction radiography was more effective in detecting as subtle change of alveolar bone than intraoral standard radiography. With the aid of quantitative analysis of digital subtraction radiography, alveolar bone resorption of apposition can be estimated during diagnosis and treatment of periodontally diseased patients.