• The Journal of the Korea Contents Association
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• v.6 no.5
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• pp.85-95
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• 2006

In this paper, we propose a method for simplifying the modeling of 'walk' for various instances of quadruped and easily extending the model of 'walk' for the instance of new subordinate class which is not defined in the original class hierarchy by using the sophisticatedly modeled 'walk' of quadruped. To achieve this method, we apply the analyzed pattern of walk and classification according to the structural similarity of quadruped studied in the previous researches to the class hierarchy and propose a method for inheriting the actions of super class. This paper model the 'walk' of quadruped by concertizing the characteristics of quadruped and defining the necessary factors and appropriate domains in terms of parameters of 'walk' and apply the model to the horse and cow, typical instances of quadruped.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.9
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• pp.88-93
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• 2003

This Paper described the simulation program development for helicopter. In the design of flight control system to accomplish some special missions like UAV, it is important to minimize the execution time obtaining a linear model from nonlinear model that is used for design of controller. The first step for this kind of purpose is to complete a nonlinear model that contains full dynamic characteristics. The second step is to get the trim values that are obtained from the nonlinear model by solving an algebraic equation. And then stability and control derivatives are derived through hovering to forward flight by numerical perturbation that will be used for linear model for a specified flight condition. The software program(HeliSim) is developed by using MATLAB GUI and will provide easy modeling procedure. The suggested method in this paper is much more simpler than any other method like a fully scale helicopter model. The advantage of our suggested method will reduce the computational time due to simple formula to extract a linear model from nonlinear model that will be beneficially used for flight control system of unmanned helicopter by some reduction of computational load.

• School Mathematics
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• v.6 no.4
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• pp.389-409
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• 2004

This article presents a case study in which three middle school students developed models in modeling activity using a tool. We research the interaction of model development process and the activities operating a tool in the modeling. And we investigate whether students are able to create generalizable model, after a tool mediates students' thought process and students internalize the perceptive activity operating a tool. The analysis of our case study led to three results. First, as students were able to integrate perceptive activity operating a tool and cognitive activity, they reasoned about the relationships among changing quantities and developed the model. Second, students corrected and refined developed models with reflecting the perceptive activity operating a tool. Third, as students internalized perceptive activity, students were able to create generalizable model, which is a graph of height as a function of the amount of water that's in the beaker.

• 한국어정보학회:학술대회논문집
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• 2016.10a
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• pp.231-234
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• 2016

프로그래머들이 코딩을 할 때 발생하는 빈번한 실수는 많은 시간적 비용을 낭비할 수 있고 작은 실수가 전체 코드에 치명적인 에러를 유발하기도 한다. 이러한 문제점은 프로그래머들이 코드를 작성할 때 전체적인 알고리즘을 얼마나 잘 이해하는지와 이전 코드에 대한 이해력과 연관이 있다. 만약 코드에 대한 이해가 어렵다면 정교하고 간결한 코드를 작성하는데 무리가 있을 것이다. 기존 코드에 대한 난이도를 평가하는 방법은 자가평가 등을 통해 이루어져 왔다. 사람 내부 변화를 직접 측정하면 더 객관적인 평가가 가능할 것이다. 본 논문은 이런 문제들을 해결하고자 동공 추적이 가능한 아이트래커와 뇌파 측정이 가능한 EEG장비를 이용하여 습득한 생체 데이터를 통해 프로그래머들의 프로그램 난이도 예측 모델을 개발하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.928-930
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• 2005

얼굴의 특징점 추적은 많은 응용프로그램에서 사용된다. AAM기반의 접근방식은 정교한 얼굴 특징점 정보를 제공하지만 정확한 특징 점 추출을 위해 얼굴 모양 파라미터 초기화 문제와 연속 영상에서 얼굴의 이동이 클 경우 모션 보정에 대한 문제가 여전히 남아있다. 이러한 문제를 풀기 위해 본 논문에서는 CAMShift를 사용해 얼굴 영역을 추적하고, 얼굴 영역 내에서 입을 검출함으로써 AAM 검색을 위한 얼굴 모양 파라미터를 추정하는 방법을 제안한다. 기존 알고리즘과의 비교 실험을 통해 얼굴의 움직임이 심한 상황에서도 제안하는 알고리즘의 성능이 매우 우수함을 확인할 수 있었다.

• Annual Conference on Human and Language Technology
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• 2016.10a
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• pp.231-234
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• 2016

프로그래머들이 코딩을 할 때 발생하는 빈번한 실수는 많은 시간적 비용을 낭비할 수 있고 작은 실수가 전체 코드에 치명적인 에러를 유발하기도 한다. 이러한 문제점은 프로그래머들이 코드를 작성할 때 전체적인 알고리즘을 얼마나 잘 이해하는지와 이전 코드에 대한 이해력과 연관이 있다. 만약 코드에 대한 이해가 어렵다면 정교하고 간결한 코드를 작성하는데 무리가 있을 것이다. 기존 코드에 대한 난이도를 평가하는 방법은 자가평가 등을 통해 이루어져 왔다. 사람 내부 변화를 직접 측정하면 더 객관적인 평가가 가능할 것이다. 본 논문은 이런 문제들을 해결하고자 동공 추적이 가능한 아이트래커와 뇌파 측정이 가능한 EEG장비를 이용하여 습득한 생체 데이터를 통해 프로그래머들의 프로그램 난이도 예측 모델을 개발하였다.

• Journal of Educational Research in Mathematics
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• v.15 no.1
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• pp.75-105
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• 2005

This study explored a mathematical modeling flow and the effect of interactions among students and between a student and Excel on modeling in a small group modeling environment with Excel. This is a case study of three 8th graders' modeling activity using Excel during their extra lessons. The conclusions drawn from this study are as follows: First, small group modeling using Excel was formed by formulating 4∼10 modeling cycles in each task. Students mainly formed tables and graphs and refined and simplified these models. Second, students mainly formed tables, algebraic formulas and graphs and refined tables considering each variable in detail by obtaining new data with inserting rows. In tables, students mainly explored many expected cases by changing the values of the parameters. In Graphs, students mainly identified a solution or confirmed the solution founded in a table. Meanwhile, students sometimes constructed graphs without a purpose and explored the problem situations by graphs mainly as related with searching a solution, identifying solutions that are found in the tables. Thus, the teacher's intervention is needed to help students use diverse representations properly in problem situations and explore floatingly and interactively using multi-representations that are connected numerically, symbolically and graphically. Sometimes students also perform unnecessary activities in producing data by dragging, searching a solution by 'trial and error' and exploring 'what if' modeling. It is considered that these unnecessary activities were caused by over-reliance on the Excel environment. Thus, the teacher's intervention is needed to complement the Excel environment and the paper-and-pencil environment properly.

• 한국해양학회지
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• v.27 no.4
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• pp.290-302
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• 1992

Seasonal variations of salinity in the upper 500 m of the tropical Atlantic Ocean are examined, based on both climatological seasonal salinity observations and numerical simulations with hydrological forcing. The seasonal cycle of sea surface salinity has strong seasonal variations caused by shifts of the freshwater surplus zone (i.e. the intertropical convergence zone) and the river outflow. The climatological seasonal salinity in this analysis concurs with other independent observations described by Default (1981) and Levitus (1982), but provides more consistent patterns with temperature structure. The effect of salinity on density below 100 m depth in the tropical Atlantic is negligible compared to tat of temperature, which in the mixed layer salinity affects density significantly. The systematic difference between observed and simulated salinity is found to be the fact that the simulated salinity is higher in the subtropics than the observed salinity, and possible sources about the difference are also discussed.

• The Journal of Engineering Geology
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• v.17 no.1 s.50
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• pp.135-142
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• 2007

Although rock itself has high strength or low permeability, engineering properties of rock masses are significantly influenced by discontinuities such as cracks and joints. Considered with possibility of groundwater flow in massive rock mass of deep subsurface, the connectivity of micro cracks should be analyzed as a conduit of ground-water flow. The objective of this study is to estimate permeability characteristics of granite dependent on damage process with application of joint distribution analysis and modeling of permeability analysis in rock masses. In case of average permeability coefficients, the modeling results based on micro cracks data are well matched with the results from permeability tests. Based on the visualization result of three dimensional model, the average permeability coefficients through the discharge plane have a positive relationship with the number of microcrack induced by rock damage.

• 한국해양학회지
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• v.28 no.4
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• pp.292-304
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• 1993

The east Sea circulation is numerically modeled with refined grid resolution elaborated open boundary condition, and by directly imposing the measured surface temperature and salinity typical the east Korean Warm current are clearer than those in previous works. among others, The Ulleung warm Water and the Intermediate Water of minimum salinity are nicely reproduced. The latter is formed in the northern/northwestern coastal region in winter and is advocated southward by strong under-current. the former is associated with a locally generated anti-cyclonic gyres. The model indicates strong seasonal variation of Nearshore Current along the Japanese coast from wintertime barotropic to summertime baroclinic structures. the associated strong reversed under-cur-rent in summer is not well understood. Global circulation pattern is characterized by two regions of cyclonic and anti-cyclonic gyres in the north and south, respectively. The presence of these gyres indicates importance of local dynamics in East Sea circulation. This model, however, does not completely resolve the problem of overshooting of the East Korean Warm current.