• 제목/요약/키워드: .Net

검색결과 13,161건 처리시간 0.034초

Ecological Modeling for Estimation of Environmental Characteristics in Masan Bay

  • Kim, Dong-Myung
    • 한국환경과학회지
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    • 제12권8호
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    • pp.841-846
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    • 2003
  • The ecosystem model was applied to estimate the regional distribution of the net production(or consumption) of phytoplankton and the net uptake(or regeneration) rate of nutrients in Masan Bay for scenario analysis to find a proper management plan. At the surface level, net production of phytoplankton is 200 mgC/㎡/day at the entrance of the bay, and 400∼1000 mgC/㎡/day at the center of the bay. The inner area of the bay showed more than 2000 mgC/㎡/day. All areas of the bottom level have a net consumption, with the center of the bottom level showing more than 600 mgC/㎡/day. For dissolved inorganic nitrogen, the results showed a net uptake rate of 100∼900 mg/㎡/day at the surface level. It showed that the net regeneration is above 50 mg/㎡/day at the bottom level. For dissolved inorganic phosphorus, the net uptake rate showed 10.0∼80.0 mg/㎡/day at the surface level, and the regeneration rate showed 0∼20.5 mg/㎡/day at the bottom level. Therefore, in order to control the water quality in Masan Bay, it is important to consider the re-supplement of nutrients regenerated in the water column.

사람 재인식을 위한 개선된 PersonNet (Advanced PersonNet for Person Re-Identification)

  • 박성현;강석훈
    • 전기전자학회논문지
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    • 제23권4호
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    • pp.1166-1174
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    • 2019
  • 이 논문에서는 사람 재식별 모델인 PersonNet의 성능을 개선하는 방법을 제안하고 실험한다. 특징점 추출을 위해 인셉션 레이어를 접목하여, 기존 32개의 특징점을 154개로 증가시켜 강화하였다. 또한, PersonNet에서 사용하는 CND 방식을 수정하여 비대칭성을 완화하였고, 보행자 이미지의 특징점을 3부분으로 나누어 가중치를 적용한 방법을 적용하여 특징을 더 뚜렷하게 파악하도록 하였다. 성능 평가를 위해 CUHK01, CUHK03 그리고 Market-1501 3가지의 데이터베이스를 사용하였고 실험 결과 27~31% 성능이 개선되었다.

Yaw 를 가진 긴 관통자와 경사판재의 고속충돌 수치해석 (Numerical Simulation of High-Velocity Oblique Impacts of Yawed Long Rod Projectile Against Thin-Plate)

  • 유요한
    • 대한기계학회논문집A
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    • 제26권7호
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    • pp.1426-1437
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    • 2002
  • Using the Lagrangian explicit time-integration finite element code NET3D which can treat three-dimensional high-velocity impact problems, oblique penetration processes of long rod projectile with yaw against thin plate are simulated. Through the comparison of simulation result with experimental result and other code's computational result, the adaptability and accuracy of NET3D is evaluated under the complex situation in which yaw angle and oblique angle exist simultaneously. Main research contents to be handled in this paper include the followings. First, the accuracy and efficiency estimation of NET3D code result obtained from the oblique penetration simulations of long rod projectile with yaw against thin plate. Second, the effect of increasing impact velocity. Third, the effect of initial yaw for the spaced-plate target. Residual velocities, residual lengths, angular velocities, and final deformed configurations obtained from the NET3D computations are compared with the experimental results and other code's computational results such as Eulerian code MESA and Lagrangian code EPIC. As a result of comparisons, it has been found that NET3D code is superior to EPIC code and MESA code in the prediction capability of residual velocity and residual length of penetrator. The key features obtained from the experiment can be successfully reproduced through NET3D simulations. Throughout the study, the applicability and accuracy of NET3D as a metallic armor system design tool is verified.

한의과대학부속 한방병원의 손익분석 - 2007~2009년도 7개 대학의 16개 부속한방병원을 중심으로 - (A Profitability Analysis of Sixteen Oriental Medicine Hospitals)

  • 이우천;이선동;김진현
    • 대한예방한의학회지
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    • 제15권2호
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    • pp.145-155
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    • 2011
  • The purpose of this paper is to review the profitability of sixteen university hospitals of oriental medicine during 2007~2009. Data was collected from 16 hospitals that reveal financial statements to the public and the hospitals were classified into 7 groups. Net sales and COGS per 100 beds of the 7 groups were analyzed to measure profitability and as a percentage of net sales, the rates of personnel expenses, maintenance costs, and material costs were evaluated. The results showed that six groups had consecutively recorded net loss in medical services and differences in profitability among 7 groups were substantial. The analysis showed the profitability was significant for medium-sized hospitals. The rates of personnel expenses in net sales were above 50% in 6 groups with net loss and one group with net profit was 45%. This result indicate the rate of personnel expenses in net sales could be the main factor affecting profitability and further studies are recommended to analyze the determinants of profitability in oriental medical hospitals.

Does Different Performance of Sampling Gears (Cast Net versus Gill Net) Bring the Inappropriate Estimation of Freshwater Fish in a Large River?

  • Kim, Jeong-Hui;Park, Sang-Hyeon;Baek, Seung-Ho;Jang, Min-Ho;Lee, Hae-Jin;Yoon, Ju-Duk
    • 생태와환경
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    • 제53권2호
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    • pp.156-164
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    • 2020
  • The accurate estimation of fish assemblages is highly dependent on the sampling gear used for sampling. We used data from 15 sampling sites along the Nakdong River, which is a large river in South Korea, to identify differences in assemblages and sizes of freshwater fishes collected with either cast nets or gill nets, the two most commonly used sampling gear in South Korea. The two gears differed in the fish assemblages they captured, with more species caught by gill nets. Further, due to its tighter mesh size, the cast net caught significantly smaller fishes than the gill nets(independent t-test, p<0.05). We found the cast net to be appropriate for species that inhabit shallow (less than 2 m) and open water, but inappropriate for deep water, habitats with plant beds, and nocturnal species. Thus, cast net sampling is not efficient in a large river environment, and a combination of sampling methods is more suitable for understanding fish assemblages in such habitats. In general, appropriate selection of fishing methods to specific habitats is necessary to improve data quality and minimize the misrepresentation of environmental conditions.

2층 다단 신경망회로 코어넷의 처리용량에 관한 연구 (The Capacity of Core-Net : Multi-Level 2-Layer Neural Networks)

  • 박종준
    • 한국정보처리학회논문지
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    • 제6권8호
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    • pp.2098-2115
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    • 1999
  • 신경망 회로의 해석에서 아직 해결하지 못하는 부분이 은닉층(hidden layer)의 해석이다. 본 논문에서는 신경망 회로의 기본적인 구성회로로써 하나의 입력(p levels)과 하나의 출력(q levels)을 갖는 2-layer Core-Net를 정의하고, 이 Core-Net의 처리 가능 용량(the capacity)은 2차원 무게값 공간(weight space)을 나눌 수 있는 영역의 수로, {{{{ {a}_{p,q} = {{q}^{2}} over {2}p(p-1)- { q} over {2 } (3 { p}^{2 } -7p+2)+ { p}^{2 }-3p+2}}}}임을 수학적 귀납법으로 증명하였다. 이 Core-Net로 신경망 회로의 중간층 해석이 가능함을 시뮬레이션 예제를 통하여 보였다.

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정보가전용 내장형 DBMS 제작에 관한 연구 (Research Issues on embedded DBMS for IIA (Internet Information Appliances))

  • 이진호;강성일;장우석;정병대;오승준;우승택;김연숙
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2001년도 춘계학술발표논문집 (하)
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    • pp.929-932
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    • 2001
  • 인터넷 정보 가전(IIA; Internet Information Appliance)내에 내장형 DBMS 의 개발은 다양한 이종 네트워크의 통신을 지원하기 위한 미들웨어(Middleware, i.e. OSGi)의 지원이라는 문제를 해결해야만 하기 때문에, 이들 미들웨어와의 인터페이스라는 문제가 기존의 데이터베이스 엔진을 개발하는 문제와 가장 큰 차이점이라 할 수 있다. 이외에는 일반적인 메모리 상주 데이터베이스 엔진 (nain memory DBMS)을 개발하는 것과는 별다른 큰 차이점이 아직까지는 연구되지 않고 있다. 하지만, 가정이라는 지역적인 특성을 고려한 데이터 서비스를 먼저 염두에 두어야 하며, 이에 따라 다양한 응용 소프트웨어를 쉽게 개발할 수 있는 방향으로 제작이 되어야 한다는 점을 늘 고려해야 한다. 본 논문에서는 이와 같은 인터넷 정보가전용 내장형 DBMS 개발 사업에 관하여 현재까지 본 과제에서 논의되고 있는 요구사항을 분석한 결과를 정리하고, 이에 관한 토론을 하고자 한다.

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그물코의 길이와 콧수의 변화에 따른 모노필라멘트 자망 그물감의 중량 계산 (Calculation of weight on netting with the changes of size and number of mesh for monofilament gill net fishing gear)

  • 박성욱
    • 수산해양기술연구
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    • 제48권4호
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    • pp.301-309
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    • 2012
  • A net-assembling company for gill net fishing gears makes a design based on the size of nets provided and determines floats, types of weights, and numbers. In addition, through the accurate examination of net weights in the process of fishing gear designing, it can prevent an excessive use of designing costs. The weight of twine can be easily calculated by its thickness differences, but the weight of netting has errors to be calibrated since the weight of netting is not changing exponentially with the changes of number and size of meshes. This study aims to suggest and empirically analyze the methods for estimating the weights of netting in accordance with the changes of number, size and thickness of meshes for a sound management of netting and net-assembling companies. Results indicated that the method using the knots and legs of netting was not practically usable because the errors were increased as the number of mesh increased. However, the method using netting area shown its usage potentiality with the calibration of the increasing ratio of mesh numbers.

SSD-Mobilenet과 ResNet을 이용한 모바일 기기용 자동차 번호판 인식시스템 (Vehicle License Plate Recognition System using SSD-Mobilenet and ResNet for Mobile Device)

  • 김운기;;조성원
    • 스마트미디어저널
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    • 제9권2호
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    • pp.92-98
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    • 2020
  • 본 논문은 고성능의 서버 없이 안드로이드 스마트폰 단독으로 동작할 수 있도록 경량화 딥러닝 모델을 사용하여 구현한 자동차 번호판 인식 시스템을 제안한다. 자동차 번호판 인식시스템은 [번호판검출]-[문자영역 분할]-[문자인식]으로 3단계의 과정으로 구성되며, 번호판검출은 SSD-Mobilenet, 문자영역 분할은 ResNet에 localization을 추가하여 사용하였고 문자인식은 ResNet을 이용하여 구현하였다. 테스트한 기기는 삼성 갤럭시 S7, LG Q9이며 정확도는 약 85.3%, 실행속도는 약 1.1초가 소요된다.

A preparatory study on fish behavioral properties in a set-net

  • KANG, Myounghee;LIU, Jenming;HASSAN, Raja Bidin bin Raja;FAJARYANTI, Rina;HWANG, Bokyu
    • 수산해양기술연구
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    • 제56권2호
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    • pp.105-113
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    • 2020
  • The fish influx and behavioral properties at a set-net off Goseong, South Korea were investigated using an imaging sonar. As a result, the average influx of fish was 33.9% at day time and 66.1% at night time, respectively, which indicated that a majority of fish entered into a playground in the set-net at night. The fish behavioral properties such as target (fish) length, range, orientation and major-axis angle were examined and compared among survey dates (4, 5, and 6 June 2019) using the statistical analysis tool (analysis of variance, ANOVA). The behavioral properties presented differently sometime of survey dates. This is preparatory study to support fish behavior properties in a set-net. It is expected that more elaborated behavioral information of fishes in the set-net is beneficial for designing and deploying a set-net fishing gear as well as general fish behavior research in the future.