• 시스템엔지니어링워크숍
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• 통권6호
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• pp.126-129
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• 2005

Systems engineering requirement verification model developmetn for High Speed Railway systems in progress is a national large system development program that is not only large-size and complex but also multi-disciplinary in nature. For the High Speed Railway TEP development, verification requirements that could verify system function, performance, and constraint, should be derived from SSS(system Segment specification). Hereafter, this could be referred to as verification requirements. System engineering process establishes traceability between verification requirements and system requirements. These tasks could be accomplished by the schema. using computer-aided Systems Engineering tool(CORE), High Speed Railway program can become a database and other system related to High Speed Railway program will be developed effectively and efficiently.

• 보건행정학회지
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• 제4권2호
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• pp.111-125
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• 1994

In developing total hospital information system, large amount of time and expense are to be spent while its results are likely to lead itself to end-users' dissatisfaction. Some of the main complaints on the part of end-users come from insufficient consideration of end-users environment as well as inappropriate representation of their requirement in the system alalysis and design. This papre addresses some advantages of Essential Logical Modeling Process for better analysis and design, explaining by example the developmental process of the Patent Management and Accounting System for a tertiary care hospital. In the case, the Essential Model, suggested by McMenamin and Palmer, proved to be an effective tool for clear separation of analysis and design phase and for better communication among system developers and with end-users. The modeling process itself contributed to better program modularity as well, shown in a Structured Chart. Difficulties in learning how to identify' essential activities' for the modeling practice were experienced in the beginnins stage, which were, however, overcome by elaborating some heuristic guideling and by rdferring to necessary tools including State Transition Diagram, Control Flow Diagram, and so many. While full evaluation of the Essential Model usag remains to wait till the completion of the case project, its strengt in making clear distinction between analysis and design phase was enough to be attractive to system analysts. The model concepts are open to many further application fields, particularly such areas as business re engineering, process remodeling, office automation, and organizational restructuring.

• 융합보안논문지
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• 제5권4호
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• pp.33-40
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• 2005

교육은 정보를 받아들이는 가장 큰 통로의 하나라 할 수 있다. 유비쿼터스 시대를 맞이하면서 새로운 교육기술과 환경이 요구되고 이에 따른 많은 기술이 등장하고있다. 현재의 e-learning 또한 많은 요구점들을 해결하기위해 많은 변화가 이루어질 필요가있다. 본 논문서는 언제 어디서나, 어떤 내용에 관계없이 학습할수있는 유비쿼터스환경의 e-learning 모델을 위하여 기존 e-learning 모델의 한계점을 분석하고, 유비쿼터스 네트워크망과 차세대 센서기술등을 적용하여 SCORM표준안을 기반으로한 LMS에 학습콘텐츠의 변환서비스와 협력 학습서비스기능을 추가한 유비쿼터스 환경에 대응하는 LMS모델을 제안하였다. 학습형태 변환서비스는 센서 기술에 의해서 학습자의 주변상황을 감지 하거나 신체상태를 파악하여 스마트 센서로 정보화하여 학습자에게 가장 적합한 형태로 콘텐츠를 서비스해준다. Orestia SOB등의 센싱기술의 접목은 보다 원활한 협력학습 서비스를 가능케 해줄것이다.

• Steel and Composite Structures
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• 제20권2호
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• pp.267-293
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• 2016

It is well known that, in order to accurately predict the behaviour of steel structures a requirement the definition of the mechanical behaviour of beam-to column joints is of primary importance. This goal can be achieved by means of the so-called component method, which, in order to obtain the whole behaviour of connections, provides to break up joints in basic components of deformability and resistance. One of the main joint components used to model bolted connections is the so-called equivalent T-stub in tension, which is normally used to predict the behaviour of bolted plates in bending starting from the behaviour of the single bolt rows. In past decades, significant research efforts have been devoted to the prediction of the behaviour of bolted T-stubs but, to date, no particular attention has been devoted to the characterization of their plastic deformation capacity. To this scope, the work presented in this paper, taking into account the existing technical literature, proposes a new theoretical model for predicting the whole behaviour up to failure of bolted T-stubs under monotonic loading conditions, including some complexities, such as the bolt/plate compatibility requirement and the bolt fracture, which are necessary to accurately evaluate the ultimate displacement. After presenting the advances of the proposed approach, a comparison between theoretical and experimental results is provided in order to verify its accuracy.

• 한국양식학회지
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• 제9권2호
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• pp.169-178
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• 1996

본 실험은 조피볼락의 비타민 C 요구량 설정을 위한 실험모델과 실험사료를 개발하고 각 조직 내의 비타민 C 축적량에 따른 영양특성 그리고 그에 따른 요구량을 제시하고자 실시되었다. 실험어는 실험시작 평균체중이 12.6 g인 조피볼락 치어를 사용하였으며, 6개 실험구로 나누어 3반복으로 비타민 C 첨가 농도를 달리한 6개의 반정제 실험사료를 공급하였다. 4주간의 예비사육 (대조구사료 공급)후 8주간의 사육 실험을 실시하였으며, 6가지 실험사료의 비타민 C 농도는 다음과 같다 ; 0 (대조구), 25, 50, 75, 150 and 1500 mg L-ascorbic acid/kg diet ($C_0,\;C_{25},\;C_{50},\;C_{75},\;C_{150},\;and\;C_{1500}$). 증중율과 사료전환효율은 대조구사료를 공급한 실험구가 $C_{150}$과 $C_{1500}$ 사료를 공급한 실험구보다 유의적으로 낮게 나타났다(P<0.05). Hematocrit은 대조구사료를 공급한 실험구가 다른 실험구들에 비해 유의적으로 낮게 나타났다(P<0.05). 근육 조직내의 비타민 C 농도는 대조구가 가장 낮아서 $C_{150}$과 $C_{1500}$ 실험구와 유의차를 보였고, 고농도 첨가구인 $C_{1500}$ 실험구가 다른 모든 실험구들에 비해서 유의적으로 높게 나타났다(P<0.05). 그러나 간, 아가미, 뇌조직의 비타민 C 농도는 $C_{1500}$ 실험구만 다른 실험구에 비해 유의적으로 높을뿐(P<0.05), 다른 실험구들간에는 유의적인 차이를 보이지 않았다(P>0.05), 따라서 조직내의 농도로는 근육에서 4.8 mg AA/kg 이하이면 성장, 사료효율, hematocrit에서의 결핍증상을 발견할 수 있을 것으로 판단되며, 사료내 비타민 C 요구량은 40 mg AA/kg diet 이상이고, 150 mg AA/kg diet이면 충분할 것으로 생각된다.

• Asian-Australasian Journal of Animal Sciences
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• 제2권3호
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• pp.261-263
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• 1989

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.754-759
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• 1993

An adaptive model predictive control (AMPC) strategy using auto-regression moving-average (ARMA) models is presented. The characteristic features of this methodology are the small computer memory requirement, high computational speed, robustness, and easy handling of nonlinear and time varying MIMO systems. Since the process dynamic behaviors are expressed by ARMA models, the model parameter adaptation is simple and fast to converge. The recursive least square (RLS) method with exponential forgetting is used to trace the process model parameters assuming the process is slowly time varying. The control performance of the AMPC is verified by both comparative simulation and experimental studies on distillation column control.

• Asian-Australasian Journal of Animal Sciences
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• 제16권12호
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• pp.1782-1788
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• 2003

A mathematical model has been constructed to estimate the amino acid requirements for growing Taihe silky fowls in early stage. A requirement was taken as the sum of the needs for maintenance, for gain in carcass weight without feathers, and for the feathers. The maintenance requirement was considered to be the sum of the needs for replacing skin and intestinal losses and for the obligatory creatinine excretion in the urine. A comparative slaughter trial and nitrogen balance trials with growing and adult Taihe silky fowls, respectively, were conducted to estimate the parameters in the model. The amino acid requirements were then calculated with the constructed models. The results showed as following: the replacement needs for skin nitrogen loss was determined at 213.41 mg/d for adult male fowls (body weight 1.60 kg); creatinine excretion in these birds was 4.04 mg/d. when fed an nitrogen-free diets, the adult male fowls with body weight 1.60 kg excreted a total of 246.10 mg/d endogenous nitrogen. The net protein requirement for maintenance was estimated at $11.24mg/w_g{^{0.75}}/d$Per gram of body weight gain contained 27.18 mg carcass nitrogen for growing birds in early stage, but feathers nitrogen in per gram of body weight gain increased with age. The amino acid requirements for growing Taihe silky fowls were slightly higher than for starting and growing pullets, but lower than that of broiler chicks. The amino acid requirements patterns changed with weeks of age.

• 한국시뮬레이션학회논문지
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• 제26권1호
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• pp.55-67
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• 2017

한국군 소요체계는 2007년부터 합동전투발전체계(JCDS)를 도입 후 하향식(Top Down) 능력기반 소요체계를 적용 중에 있다. 그러나 이러한 새로운 체계가 현 소요체계와 연계성을 가지고 원활히 추진되어 오지 못하고 있다. 또한 현재의 분석평가 방법론은 시간 소모적이고 많은 비용이 요구되어지고 있고 전체적 관점에서 문제가 무엇인지? 문제에 대한 합리적 대안이 무엇인지를 알 수가 없었으며, 최근에 도입된 능력기반평가에서도 신속하고 신뢰성있는 방법론을 제시하지 못하고 있는 실정이다. 따라서 본 연구의 주목적은 소요를 기획하기 위한 분석평가 단계에서 고가의 시뮬레이션 도구를 이용한 정밀 시뮬레이션 대신 시간과 노력의 낭비를 최소화하여 효과적인 능력기반평가를 실시하기 위해 미군 능력기반평가(CBA)에서 강력히 권고하고 있는 Quick Look의 개념을 반영하고, 신뢰성 있는 분석결과를 얻기 위해 미군 및 한국군에서 운용하고 있는 전구급 워게임 모형인 JICM(Joint Integrated Contingency Model)의 무기점수를 활용하여 정량적인 능력평가를 실시할 수 있도록 실증적 방법론을 제시하고자 한다.

• 한국농공학회논문집
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• 제57권6호
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• pp.173-183
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• 2015

The aim of this study was to develop a soil moisture simulation model equipped with meteorological data enhanced by WRF (Weather Research and Forecast) model, and this soil moisture model was applied for quantifying soil moisture content and irrigation requirement. The WRF model can provide grid based meteorological data at various resolutions. For applicability assessment, comparative analyses were conducted using WRF data and weather data obtained from weather station located close to test bed. Water balance of each upland grid was assessed for soils represented with four layers. The soil moisture contents simulated using the soil moisture model were compared with observed data to evaluate the capacity of the model qualitatively and quantitatively with performance statistics such as correlation coefficient (R), coefficient of determination (R2) and root mean squared error (RMSE). As a result, R is 0.76, $R^2$ is 0.58 and RMSE 5.45 mm in soil layer 1 and R 0.61, $R^2$ 0.37 and RMSE 6.73 mm in soil layer 2 and R 0.52, $R^2$ 0.27 and RMSE 8.64 mm in soil layer 3 and R 0.68, $R^2$ 0.45 and RMSE 5.29 mm in soil layer 4. The estimated soil moisture contents and irrigation requirements of each soil layer showed spatiotemporally varied distributions depending on weather and soil texture data incorporated. The estimated soil moisture contents using weather station data showed uniform distribution about all grids. However the estimated soil moisture contents from WRF data showed spatially varied distribution. Also, the estimated irrigation requirements applied WRF data showed spatial variabilities reflecting regional differences of weather conditions.