• 제목/요약/키워드: IT Assimilation

검색결과 379건 처리시간 0.032초

Gaussian noise addition approaches for ensemble optimal interpolation implementation in a distributed hydrological model

  • Manoj Khaniya;Yasuto Tachikawa;Kodai Yamamoto;Takahiro Sayama;Sunmin Kim
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2023년도 학술발표회
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    • pp.25-25
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    • 2023
  • The ensemble optimal interpolation (EnOI) scheme is a sub-optimal alternative to the ensemble Kalman filter (EnKF) with a reduced computational demand making it potentially more suitable for operational applications. Since only one model is integrated forward instead of an ensemble of model realizations, online estimation of the background error covariance matrix is not possible in the EnOI scheme. In this study, we investigate two Gaussian noise based ensemble generation strategies to produce dynamic covariance matrices for assimilation of water level observations into a distributed hydrological model. In the first approach, spatially correlated noise, sampled from a normal distribution with a fixed fractional error parameter (which controls its standard deviation), is added to the model forecast state vector to prepare the ensembles. In the second method, we use an adaptive error estimation technique based on the innovation diagnostics to estimate this error parameter within the assimilation framework. The results from a real and a set of synthetic experiments indicate that the EnOI scheme can provide better results when an optimal EnKF is not identified, but performs worse than the ensemble filter when the true error characteristics are known. Furthermore, while the adaptive approach is able to reduce the sensitivity to the fractional error parameter affecting the first (non-adaptive) approach, results are usually worse at ungauged locations with the former.

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IT벤처기업의 기업가정신과 동적역량 간의 관계분석을 통한 조직유효성 향상방안에 관한 연구 (An Improvement of Organizational Effectiveness through the Analysis of the Relationship between Entrepreneurship and Dynamic Capabilities in IT Venture Business)

  • 김수영;유왕진;이상진
    • 한국전자거래학회지
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    • 제19권4호
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    • pp.101-117
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    • 2014
  • 본 연구의 목적은 기업가정신과 동적역량 간의 관계분석을 통해 조직유효성에 미치는 영향을 알아보고, 나아가 조직유효성 향상 방안에 대해서 연구하는 것이다. Teece(2002)의 동적역량의 이론을 토대로 조사하였으며, 이에 따른 세부항목을 연구하여 연구 모형을 수립하였다. 본 연구의 가설은 다음과 같이 설정하였다. 첫째, 기업가정신은 동적역량에 유의한 영향을 미칠 것이다. 둘째, 동적역량은 조직유효성에 유의한 영향을 미칠 것이다. 설문은 IT 벤처기업에 재직 중인 임직원을 대상으로 설문조사를 실시하여 412부를 분석에 사용하였다. 본 연구의 결과는 다음과 같다. 기업가정신과 동적역량 간의 관계가 조직유효성에 유의미한 영향을 미치고 있다. 특히 조직에서 동적역량의 융합탐색역량이 조직유효성에 높은 영향력을 미치는 것으로 밝혀졌다. 이에 CEO는 조직구성원들에게 동적역량의 융합탐색역량을 적극적으로 개발하고 조직유효성에 영향력을 행사하고 있는지 고려해 볼 필요가 있다.

Effect of Gamma Rays on the Growth Performance of Bangladesh Clone Tea

  • Ali, M. Aslam;Samad, M. A.;Amin, M. K.
    • 한국환경농학회지
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    • 제24권1호
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    • pp.66-70
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    • 2005
  • The experiment was carried out to investigate the effects of gamma radiation on the early growth performance and physiological traits of BT2 clone tea, the most promising cultivar released by Bangladesh Tea Research Institute. The fresh shoot cuttings were irradiated with seven different levels of gamma radiation such as 0, 10, 20, 30, 40, 50 and 60 Gy from Cobalt 60Co source (Dept. of PlantBreeding, Bangladesh Institute of Nuclear Agriculture). Thereafter, the irradiated shoot cuttings were planted in polythene bags and kept under natural conditions. It was observed that callusing was initiated from 8th weeks after placement of tea shoot cuttings in the polythene bags and completed by 12th weeks. The morphological growth of tea shoot cuttings were recorded under varying levels of gamma radiation and growth stages. It was observed that the number of leaves, number of primary branches, base diameter, root length and total leaf area per plant significantly increased with the progress of time and increasing levels of gamma radiation, however, the plant height showed decreasing trend with the increasing levels of gamma radiation, which could be due to the change in chromosomal structure and genetic makeup. After 56 weeks of planting, the plant height, the number of leaves and primary branches per plant, base diameter, root length and total leaf area per plant recorded were 65.70 cm, 30.67, 7.33, 1.48 cm, 23.50 cm, and 1250.67 cm2 per plant respectively under the radiation level 60 Gy, whereas the corresponding figures of the above parameters at the control treatment were 76.21 cm, 18.33, 3.67, 0.92 cm, 17.75 cm and 778.33 cm2 per plant, respectively. A significant relationship was observed among the physiological growth parameters with the increasing levels of gamma radiation. The total dry matter gain, leaf area index, absolute growth rate and relative growth rate were significantly influenced with the rising levels of gamma radiation (up to 60 Gy), whereas the net assimilation rate of individual tea plant non-significantly responded as compared to those of control treatment. Finally after 56 weeks of planting, the maximum total dry weight gain, leaf area index, absolute growth rate, relative growth rate and net assimilation rate recorded under 60 Gay radiation level were 40.25 g/plant/week, 4.25, 1.18 g/week, 0.0621g/g/week and 17.07 g/m2/week respectively.

공공부문 IT신기술 적용사업의 추진현황 평가와 정책적 시사점 (An Assessment and Policy Implication of Information Technology Convergence Programs in Korean Public Service Area)

  • 김성현
    • 한국IT서비스학회지
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    • 제11권sup호
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    • pp.1-16
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    • 2012
  • Information technology is a useful strategic weapon that can create competitive advantage and new business opportunity by applying it in the organization' value chain. IT convergence can be understood as an attempt of industrial level IT adoption to facilitate the innovation of the industry and the birth of a new industry. This study provides the comprehensive review of the Korean government' three IT assimilation programs, ubiquitous technology diffusion program of the Ministry of Knowledge Economy, u-service program of the Ministry of Public Administration and Security, and u-Defence cooperation program of the Department of Defense. The analysis is done through the interpretation of the existing literature and the logic model. The result proposes inter-agency cooperation and building of new technology road-map in the planning stage, flexible management in the execution phase, and failure tolerant evaluation system. The proposal for developing competencies and institutional foundations for IT convergence also presented.

1930년대에서 1950년대까지 싱가포르 티옹 바루 단지에서 공공주택의 동화와 이식에 관한 연구 (A Study on Assimilation and Transplantation of Public Housing at the Tiong Bahru Estate in Singapore from the 1930s to the 1950s)

  • 우동선;탁충석
    • 건축역사연구
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    • 제23권6호
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    • pp.27-37
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    • 2014
  • Early 20th century Singapore was faced with the problem of overcrowding. The attendant problems of a rapid increase in population density, namely the lack of proper housing and sanitation, resulted in the issue of an appropriate residential environment emerging as an important task in urban planning. It was necessary to construct housing estates in order to solve this issue. At that time, the British colonial government attempted to transplant modern technology into the construction process of a residential complex system. However, Singapore's climate and traditional lifestyle made it impossible to apply the British modern system in a straightforward manner, and in the process, a number of transformations emerged. With a specific focus on the Tiong Bahru estate, one of Singapore's representative public housing projects, from the 1930s through the 1950s, this study intends to look at the way in which such residential estates were assimilated into local surroundings, and the effect of the transplantation of British concepts of modern housing theory. Therefore, the study is divided into an examination of the estate both before and after the turning point of World War II. This study confirms that the difference between the pre-war and post-war planning strategies for the Tiong Bahru estate were made according to the concept of 'open space.'

치위생과학생의 Kolb 학습유형과 자기조절 학습전략 (Kolb learning styles and self-regulated learning strategies of dental hygiene students)

  • 김미정;임차영
    • 한국치위생학회지
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    • 제13권2호
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    • pp.343-350
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    • 2013
  • Objectives : The objective of this study is to analyze about learning styles and self-regulated learning strategies of dental hygiene students and to find methods that may increase learning outcomes by selecting effective learning methods. Methods : The subjects of this study are 524 dental hygiene students in region of chonbuk from May, 2012 to June, 2012. collected informations are analyzed with SPSS. Results : 1. 38.1%, assimilator is most of learning styles of dental hygiene students, followed by 29.7%, converger, 16.2%, diverger, 15.8%, accommodator. 2. 28.0%, converger and diverger are most of subjects whose grade score is between 2.0-2.9, 41.50%, accommodator is most of 3.0-3.4, and 41.61% accommodator is most of 3.5-3.9, and 28.0%, converger is most of subjects whose grade score is more than 4.0. this results has statistically signification(p<0.01). 3. $8.71{\pm}1.78$, assimilation strategy is most self-regulated learning strategies of dental hygiene students, followed by $8.26{\pm}1.94$, control strategy, $7.52{\pm}2.00$, memorization strategy. accommodator is most showed $7.82{\pm}2.24$, $9.13{\pm}1.74$, $8.71{\pm}2.20$ in memorization strategy, assimilation strategy, control strategy. 4. It is showed that assimilator is significantly related with satisfaction for major(p<0.01), accommodator is significantly related with academic records(p<0.05), and diverger is significantly negative related with academic records, through the results of the analysis of factors that affects learning styles. Conclusions : Organizing above results, It is considered that instructor needs to acknowledge learning styles of students through understanding about various learning styles of students, and may has to develop suitable teaching method for students based on that.

산청군 생초면 일대에 분포한 심성암체의 분화에 관한 연구:마그마분화의 미량원소 모델링 (Differentiation of the Plutonic Rocks in Saengcho-myon, Sancheong-gun:Trace Element Modelling for the Magmatic Differentiation)

  • 정지곤;김원사;서병민
    • 한국광물학회지
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    • 제4권2호
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    • pp.69-89
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    • 1991
  • The anorthositic rocks and the many other plutons which are of different varieties and age were distributed in the northern extremity of the distributed areas of H-S anorthositic rocks. The purpose of this study was to find plutons which had comagmatic relationships, and to make clear the magmatic process of anorthositic magma. The plutons were classified, and the petrological and the geochemical characteristics of the plutons were compared and researched in this study. And, because, like anorthosite, the rocks which intrude in the deep crust accompany assimilation, an AFC model calculation was performed to make the differentiation process of the anorthositic rocks clear. The plutons in this area were classified into three groups, and the three groups were composed of the Precambrian anorthositic rocks and related rocks, the Jurassic gabbro, and the plutons of undnown age. The anorthositic magma was differentiated from the anorthositic rocks through the tonalite to the alkali-feldspar granite, and it was differentiated under K, Mg, Fe free/lack condition. It was found from the result of AFC model that the anorthositic rocks were differentiated by fractional crystallization, but they were assimilated with wall-rocks, and the assimilation was performed at the rate of r$\leq$0.1. The plutons which intruded the anorthositic rocks subsequently consisted of the gabbro, the megacrystic granite, the fine-grained granite, and the gneissose granite. But they were formed by the repeated intrusion of magma, which may, or may not, be of the same origin. According to the result of the RCF model, these plutons were differentiated by simple fractional crystallization, and they were assimilated relatively less than the anorthositic rocks.

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Reframing Loss: Chinese Diaspora Identity in K. H. Lim's Written in Black

  • Hannah Ming Yit Ho
    • 수완나부미
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    • 제15권2호
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    • pp.131-152
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    • 2023
  • In analyzing the Chinese diaspora, this paper explores losses that are encountered within the family in the nation. It argues that increased social and spatial mobilities that contribute to losses can be reconfigured through the productive lens of supermobility, as Laurence J. C. Ma conceptualizes it. Supermobile identities are significant avenues to consider the way that losses traditionally associated with migration and assimilation are revisited in view of new flows of migration and identification. In examining K. H. Lim's debut novel Written in Black (2014), this study addresses pathways from debilitating losses to productive losses journeyed by the family from the child's perspective. It offers a critical analysis of the Anglophone Bruneian novel in terms of its exclusive portrayal of an ethnic Chinese family. Departing from a fixed notion of home as cultural and physical rootedness, it explores flexible identities that are tied to shifting concepts of belonging. Rather than a magnification of social and spatial losses, the analysis highlights the way that the literary imagination of ethnic Chinese in Brunei Darussalam accommodates progressive ideas of the agency and advancement of the Chinese diaspora as a supermobile community.

Effect of $Cr^{6+}$ Stress on Photosynthetic Pigments and Certain Physiological Processes in the Cyanobacterium Anacystis nidulans and Its Chromium Resistant Strain

  • KHATTAR, J. I. S.,;SARMA, T. A.;ANURADHA SHARMA,
    • Journal of Microbiology and Biotechnology
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    • 제14권6호
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    • pp.1211-1216
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    • 2004
  • A MNNG (N-methyl-N'-nitro-N-nitrosoguanidine) induced chromium resistant strain ($Cr^{r}18$) of unicellular cyanobacterium Anacystis nidulans has been isolated and characterized. The resistant strain could grow (although restricted to $50\%$ of control) in chromium concentration (180${\mu}M$) lethal to the wild-type. Sublethal ($160{\mu}M$) concentration of $Cr^{6+}$ significantly reduced (13-$37.5$) all the photosynthetic pigments of A. nidulans with maximum reduction in phycoerythrin followed by ChI $\alpha$. Pigments of A. nidulans were drastically decreased in lethal concentration of Cr^{6+} with maximum reduction in phycoerythrin ($75\%$) and allophycocyanin ($67.5\%$). Resistant strain $Cr^{r}18$ resisted toxic effects of sublethal and lethal concentrations of $Cr^{6+}$ on photosynthetic pigments as revealed by less decrease in pigments as compared to A. nidulans. Effect of $Cr^{6+}$ stress was also studied on nitrogen assimilation and phosphate uptake. Sublethal concentration of $Cr^{6+}$ drastically reduced ($71.5\%$) nitrate uptake by A. nidulans while a decrease of $29\%$ was observed in strain $Cr^{r}18$. Short (2 day) exposure of A. nidulans and its resistant strain $Cr^{r}18\;to\;Cr^{6+}$ did not affect nitrate reductase and glutamine synthetase (transferase), whereas longer (10 day) exposure to $Cr^{6+}$ lowered activities of both enzymes in A. nidulans but not significantly in the strain $Cr^{r}18$. Ammonium uptake by both strains was not affected by $Cr^{6+}$. Thus, $Cr^{6+}$ affected photosynthetic pigments, nitrogen assimilation, and phosphate uptake of A. nidulans, while strain $Cr^{r}18$ was able to resist toxic effects of the metal. Advantages of using strain $Cr^{r}18$ for bioremediation purposes have been evaluated by studying $Cr^{6+}$ removal from the solution. Resistant strain $Cr^{r}18$ was able to remove $33\%$ more $Cr^{6+}$ than A. nidulans and thus it can prove to be a good candidate for bioremediation of $Cr^{6+}$ from polluted waters.

제주 지역에 적합한 중규모 단시간 예측 시스템의 개발 (Development of Meso-scale Short Range NWP System for the Cheju Regional Meteorological Office, Korea)

  • 김용상;최준태;이용희;오재호
    • 한국지구과학회지
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    • 제22권3호
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    • pp.186-194
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    • 2001
  • 제주 지방 기상청을 대상으로 하는 지역 규모 단시간 수치예보 시스템을 구축하였다. 기상청 본청에서 하루 2회 제공되는 30 km해상도의 수치예보 자료로는 지방 기상청의 예보관들이 우리 나라와 같이 복잡한 지형에서 발생하는 그 지역의 국지 악기상을 파악하기에는 무리가 있다. 지역 규모의 고해상도 수치예보를 위해 LAPS와 MM5를 자료분석과 예보 모델로 이용하였다. LAPS는 양질의 수치예보 초기자료를 생산해 내기 위해 종관 관측 자료뿐만 아니라 위성 및 레이더 등의 비 종관 관측자료도 자료동화에 이용한다. MM5 모델은 16노드의 펜티엄 PC로 구성된 클러스터에서 수행되었으며 이 시스템은 분산병렬 클러스터 컴퓨터로 가격대비 성능이 매우 우수한 미니 슈퍼컴퓨터이다. 자료동화 모델, 수치예보 모델 그리고 PC-클러스터를 종합한 지역 규모 단시간 수치예보 시스템을 한라 단시간 예측 시스템이라 명명하였으며 이 시스템은 현재 제주 지방 기상청에서 독자적으로 운영되고 있다. 기상청 본청에서 제공되는 수치예보 정보로는 탐지할 수 없었던 1999년 7월 9일 제주 지역의 집중호우 사례에 대하여 본 시스템을 검증한 결과 모델이 예측한 강수량이 실제 강수량을 잘 재현하였다. 한라 단시간 예측 시스템은 2000년 4월부터 하루 4회 제주 지방기상청에서 독자적으로 운영되고 있다.

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