• 제목/요약/키워드: Early selection

검색결과 738건 처리시간 0.029초

LCC 평가를 통한 지붕방수공법선정에 관한 연구 (A Study on Selection of Roof Waterproofing Method by analyzing Life Cycle Costing)

  • 최오영;김태희;김광희
    • 한국건축시공학회지
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    • 제8권5호
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    • pp.127-134
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    • 2008
  • The purpose of this study is to propose the decision making technique in roof waterproofing method at the early construction stage. Selecting the suitable construction method is difficult because of the complex interrelationships between many factors of influencing the construction method selection. This study presents an example of selecting suitable method by analyzing LCC (Life Cycle Cost) in roof waterproofing work. In this study, roof waterproofing method is analyzed by LCC(Life Cycle Cost) which is consists of the initial costs, running costs, and removal costs. Sheet waterproofing, membrane waterproofing and asphalt waterproofing costs are compared to select the most economic method. The result of this study revealed that considering LCC is useful in selecting the proper method in the construction work.

회전기계 결함신호 진단을 위한 신호처리 기술 개발 (Signal Processing Technology for Rotating Machinery Fault Signal Diagnosis)

  • 최병근;안병현;김용휘;이종명;이정훈
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2013년도 추계학술대회 논문집
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    • pp.331-337
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    • 2013
  • Acoustic Emission technique is widely applied to develop the early fault detection system, and the problem about a signal processing method for AE signal is mainly focused on. In the signal processing method, envelope analysis is a useful method to evaluate the bearing problems and Wavelet transform is a powerful method to detect faults occurred on rotating machinery. However, exact method for AE signal is not developed yet. Therefore, in this paper two methods which are Hilbert transform and DET for feature extraction. In addition, we evaluate the classification performance with varying the parameter from 2 to 15 for feature selection DET, 0.01 to 1.0 for the RBF kernel function of SVR, and the proposed algorithm achieved 94% classification accuracy with the parameter of the RBF 0.08, 12 feature selection.

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한국꿩의 체중과 정강이 길이 및 정강이 두께에 대한 유전모수 추정에 관한 연구 (Estiniation of Genetic Parameters for Body Weight, Shank Length, and Shank Width in Korean Pheaaant)

  • 김준;양영훈
    • 한국가금학회지
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    • 제24권3호
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    • pp.153-160
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    • 1997
  • This study was carried out to estimate the heritability and genetic correlation for body weight, shank length and shank width at various wk of age in growing Korean pheasant. All the measurements were done from one day to 20 wk of age with 4 wk interval. The heritability estimates for body weight were in the range of 0.54~0.59 for male and of 0.49~0.81 for female from 4 to 20 wk of age. The heritability estimates of male and female were in the range of 0.38~0. 82 and 0.41~0.67 for shank length, and of 0.48~0.88 and 0.49~0.71 for shank width, respectively. Genetic and phenotypic correlation coefficients between the measurements at different ages in each trait of body weight, shank length and shank width were medium to high positive values. Because the estimates of heritabilities and genetic correlations were high, the genetic gain for body weight is expected by either a direct selection or an early selection based on the record of early growing stage.

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Selection of High Redshift Quasars with Multi-wavelength Data

  • Jeon, Yiseul
    • 천문학회보
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    • 제40권2호
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    • pp.28.2-28.2
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    • 2015
  • High redshift quasars (z > 5) hold keys to understanding the evolution of the universe in its early stage. Yet, the number of high redshift quasars uncovered from previous studies is relatively small (70 or so), and are concentrated mostly in a limited redshift range (z ~ 6). To understand the early mass growth of supermassive black holes and the final stage of the cosmic reionization, it is important to find a statistically meaningful sample of quasars with various physical properties. Here we present a survey for high redshift quasars at 5 < z < 7. Through color selection techniques using multi-wavelength data, we found quasar candidates and carried out imaging follow-up observations to reduce contaminants. After optical spectroscopy, we discovered eight new quasars. We obtained near-infrared spectra for 3 of these 8 quasars, measured their physical properties such as black hole masses and Eddington ratios, and found that the high redshift quasars we discovered are growing via accretion more vigorous than those of their lower redshift counterparts. We estimated the quasar number densities from our discoveries and compared them to those expected from the quasar luminosity functions in literature. In contrast to the observed number density of quasars at z ~ 5, which agrees with literature, the observed number density at z ~ 7 shows values lower than what is expected, even after considering an extrapolated number density evolution. We conclude that the quasar number density at z ~ 7 declines toward higher redshift, more steeply than the empirically expected evolution.

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일본 가나가와현(神奈川?) 아카이브 연구 (A Study on Kanagawa Prefectural Archives in Japan)

  • 이경용
    • 기록학연구
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    • 제63호
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    • pp.115-144
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    • 2020
  • 이 논문은 일본 가나가와현 아카이브의 중간보존시설 운영과 현용기록의 조기이관 제도, 평가·선별 제도 연구를 통해 한국 기록관리 제도 개혁을 위한 참고 사례를 제공한다. 가나가와현 아카이브가 운영하는 중간보존 시설은 일본의 기록관리 개혁과 공문서관리법 제정 과정에서 주요 참조 모델로 검토된 바 있으며, 오키나와현 아카이브 등에서 '선진 사례'로 도입, 운영되고 있다. 또한, 가나가와현 아카이브는 '영구' 보존기간을 폐지하고, 10년과 30년 보존의 기록을 생산 종결된 때로부터 5년 경과 시점에 아카이브의 중간보존시설로 조기 이관한다. 기본적으로 보존기간 만료시 모든 현용기록을 재평가하는 제도이며, 1년 보존문서를 제외한 3년과 5년의 단기 보존연한 기록과 10년 이상 장기 보존연한 기록의 평가·선별을 아카이브의 핵심 업무로 설정하고 있다.

산란종계의 란중 증대성과 조기 선발에 관한 연구 (Study on the Increase of Egg Weight and Early Selection based on Part Record in Layer)

  • Park, Y.H.;Ohh, B. K.
    • 한국가금학회지
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    • 제10권2호
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    • pp.75-81
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    • 1983
  • 산란종계의 란중을 개량하기 위하여 란중에 대한 유전력과 유전상관등의 유전적 모수를 추정한 후 백색 레그혼종 2계통(A, K)에서 주령에 따른 란중의 증가양상을 살펴보았다 또한 선발에 의한 유전적 개량량을 크게 하기 위하여 조기선발을 실시할 경우 조기선발의 최적시기를 찾아내는 것이 중요하므로 년 평균란중에 대한 각 기간별 란중의 상관관계와 아울러 회귀관계를 분석하여 최적 선발시기를 알아보았고 각 기간별 선발에 의한 개량량을 상대적으로 나타내므로써 조기선발에 대한 타당성을 구명하고자 본 시험을 수행하였으며 얻어진 결과는 다음과 같다. 주령이 늘어남에 따라 란중도 증가하였는데 산란초기에서는 증가량이 컸지만 점차 감소하였으며 회귀방정식으로 나타낸 증가량은 A, K계통에서 주당 각각 0.46g과 0.83g이었다. 년 평균 란중에 대한 각 기간별 란중의 회귀계수는 29-32주령의 평균란중이 0.86(A), 0.88(K)로 나타나 가장 큰 수치를 보였다. 45-48주령의 평균란중을 기준으로 했을 때의 선발에 대한 각 기간 평균란중의 선발상대효율에서는 A계통에서 33-36주령, K통계에서 29-32주령의 추정치가 가장 크게 나타나서 이 시기에서의 조기선발에, 대한 타당성을 보여주었다.

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MdMADS2 - transgenic chrysanthemum (Dendranthema grandiflorum (Ramat.) Kitamura) showing the reduction of the days to flowering

  • Han, Bong-Hee;Lee, Su-Young;Choi, Seong-Youl
    • Journal of Plant Biotechnology
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    • 제36권4호
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    • pp.366-372
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    • 2009
  • This study was conducted to develop new lines expressing the characteristic of early flowering by introducing MdMADS2 gene in chrysanthemum (Dendranthema grandiflorum (Ramat.) Kitamura) ‘Zinba'. Transformation of chrysanthemum was conducted by Agrobacterium tumefaciens LBA4404 harboring the binary vector containing MdMADS2 controlled by double CaMV 35S promoters. Ninety three shoots were regenerated from 1,463 leaf segment explants cultured on the first selection medium (MS basal salts + 1.0 mg/L BA + 0.5 mg/L IAA + 10 mg/L kanamycin + 400 mg/L cefotaxime, pH 5.8) after co-cultivation, and 20 out of the 93 shoots rooted on the second selection medium containing 20 mg/L kanamycin and 400 mg/L cefotaxime. Many escapes (98.6%) were removed on the selection stage for rooting. Nineteen lines were confirmed as transgenic plant with transgene by PCR analysis. Six transgenic plants flowered 2-11 days earlier than non-transgenic plant without big change of phenotype, and especially, 3 (Mo-7, Mo-11, Mo-17) out of 6 transgenic lines showed a significant reduction in days to flowering compared to non-transgenic plant. Introduction and expression of MdMADS2 gene in them were confirmed by Southern and real-time PCR analyses, respectively.

지문인식도어락 디자인 개발 사례연구 (Case Study for Fingerprint ID Doorlock Design Development)

  • 서수웅
    • 한국콘텐츠학회논문지
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    • 제4권3호
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    • pp.115-123
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    • 2004
  • 본 연구에서는 지문인식 도어락제품의 특징에 대해 살펴보고, 디자인 컨셉을 결정짓는 체계적인 방법론에 대해 알아본다. 디자인 개발 프로세스는 제품의 종류와 그 특성에 따라 많은 단계를 거치게 된다. 특히 개발 초기의 컨셉을 선택하는 단계는 시장에서의 성패를 좌우하는 매우 중요한 시기이다. 본 연구에서는 다소 주관적이고, 비논리적 일 수 있는 컨셉 선택과정을 보다 객관적이고, 체계적 인 프로세스로 정립할 수 있는 방법론을 모색한다. 컨셉 선택 프로세스는 크게 두 가지 단계로 나누어진다. 우선, 컨셉을 결정짓는 요소들을 매트릭스로 구조화하여 많은 대안이 제시되었을 때보다 신속하고 합리적으로 대안을 선별해 나가는 과정이 있다. 다음으로는 선택에 영향을 주는 요소들에 가중치를 적용하여 평가함으로써 보다 이상적인 컨셉을 선택해가는 과정이 있다. 선택된 컨셉을 구체화하여 양산을 위한 디자인 확정안에 대한 렌더링을 결과로써 제시한다.

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A QoS-aware Web Services Selection for Reliable Web Service Composition

  • Nasridinov, Aziz;Byun, Jeongyong
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2012년도 춘계학술발표대회
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    • pp.586-589
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    • 2012
  • Web Services have been utilized in a wide variety of applications and have turned into a key technology in developing business operations on the Web. Originally, Web Services can be exploited in an isolated form, however when no single Web Service can satisfy the functionality required by a user, there should be a possibility to compose existing services together in order to fulfill the user requirement. However, since the same service may be offered by different providers with different non-functional Quality of Service (QoS), the task of service selection for Web Service composition is becoming complicated. Also, as Web Services are inherently unreliable, how to deliver reliable Web Services composition over unreliable Web Services should be considered while composing Web Services. In this paper, we propose an approach on a QoS-aware Web Service selection for reliable Web Service composition. In our approach, we select and classify Web Services using Decision Tree based on QoS attributes provided by the client. Service classifier will improve selection of relevant Web Services early in the composition process and also provide flexibility to replace a failed Web Services with a redundant alternative Web Services, resulting in high availability and reliability of Web Service composition. We will provide an implementation of our proposed approach along with efficiency measurements through performance evaluation.