• Aerospace Engineering and Technology
• /
• v.12 no.2
• /
• pp.74-82
• /
• 2013

This paper deals with a single stage coilgun which is a variety of EML(ElectroMagnetic Launcher) and can be applied to launching a small satellite. We propose a mathematical and physical model in order to design a single stage coilgun and study physical characteristics related to design parameters. A proposed mathematical and physical model is verified by electromagnetic FEM software FEMM 4.2.

• Journal of Educational Research in Mathematics
• /
• v.12 no.4
• /
• pp.443-455
• /
• 2002

정보화시대를 맞아 어느 때보다도 활발히 전교과에 걸쳐 학생의 의사소통의 능력을 향상하기 위한 다양한 방법이 모색되고 있다. 학교현장의 수학교육자는 수학교수-학습에서 어떤 상호작용이 일어났는지, 특히 다루기 쉬운 도구로써 계산기가 주어졌을 때 어떻게 학생의 지식 발달이 언어적 상호작용에서 이루어지는지를 알아야 한다. 본 연구는 이러한 학생의 상호작용을 분석할 때 필요한 분석도구를 개발하는 것이다. 예비연구와 본 연구를 통해 언어적 상호작용의 구성요소가 세 영역, 즉, 지식구성 진술, 사회적 상호작용 진술, 그리고 교사의 교육어 진술에서 개발되었다. 본 연구에서 개발한 자료를 이용하여 특히 학생의 지식 구성 발달에 따른 상호작용의 구성요소의 특징을 파악하고 이에 필요한 언어적 상호작용의 역할과 활성화 방안을 모색하는 연구가 가능하다.

• Journal of Digital Convergence
• /
• v.18 no.6
• /
• pp.419-424
• /
• 2020

Advances in medical technology and living standards have led to an age of aging. In addition, the development of technology and the popularization of computers have led to the development of the contents business and the release of several functional games. Among these functional games, silver functional games are being played to solve problems such as dementia, a major problem in the aging era. In this study, prior research was analyzed to suggest factors that help design based on the kinetic elements of the design method of the motion-based convergence game for the leisure use of the silver generation. Based on the analysis, the model of exercise factors for preventing dementia is presented. This research design a silver motion-based functional game using the anti-dementia exercise model presented in this study in the future, we expect to see an effective and efficient silver game in the long term.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.10
• /
• pp.3964-3973
• /
• 2010

The main purpose of this study is the vertical circulation elements(stairs, elevator, ramp) in a Museum. The first is numerically analyzed in the study. And museum of Korea was limited to the case. The result of the study can be summarized as follows. 1. 50% of cases have 3~4 vertical circulation elements.; (1) ~8 elements: 1(3%), (2) 7 elements: 2(5%), (3) 6 elements: 5(13%), (4) 5 elements: 6(16%), (5) 4 elements: 8(21%), (6) 3 elements: 11(29%), (7) 2 elements: 4(11%), (8) 1 element: 1(3%). 2. There was "stairs alone", "elevator + stairs", "elevator + stairs + ramp", "stairs + ramp" in museum of Korea. Cases of "elevator alone", "ramp alone", elevator + ramp", "stairs + elevator + ramp" was not.; (1) stairs alone: 8(21%), (2) elevator + stairs: 21(55%), (3) elevator + stairs + ramp: 8(21%), (4) stairs + ramp: 1(3%).

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.10
• /
• pp.4354-4358
• /
• 2011

Many Korean construction companies have fallen on hard times because the construction business continues to stagnate. Therefore it is necessary to measure the management efficiency for efficient operation and strengthening competitiveness of them in order to survive a difficult situation. This paper proposes a combined ANP and DEA model to analyze the efficiency of the listed construction firms. In order to determine the input and output variables of DEA, the ANP model is applied to evaluate the importance of input and output variables. The benchmarking companies and efficiency value for the construction firms with inefficiency are also provided to improve the their efficiency. The 57 listed construction companies consisted of 36 listed on KOSPI and 21 listed on KOSDAQ are analyzed in this study. The analysis results show that 11 companies whose values of CCR are 1, and 14 firms whose values of BCC efficiency are 1. In additions, the 19 firms have the scalability efficiency. Finally, we test the correlation between efficiency and the stock price.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.36 no.8B
• /
• pp.910-920
• /
• 2011

In a heterogeneous wireless environment, a variety of Radio Access Technologies (RATs) coexist. Since the number of RATs is anticipated to increase in the near future, it is desirable to have radio and network resources managed in a cooperative manner using the Common Radio Resource Management (CRRM) strategy. In order to make RAT-specific radio resources manageable in CRRM, this paper proposes the Analytical Network Process (ANP) based resource management scheme that efficiently allocates resources among heterogeneous wireless networks. The proposed ANP-based method is flexible enough to be used in any network environment and can consider a multitude of decision factors. In addition, the proposed scheme uses a radio bandwidth model, which properly reflects transmission rates under given channel conditions, as the actual radio resources to be allocated. The model considers the AMC (Adaptive Modulation and Coding) scheme that is widely used in current broadband wireless access technologies, and thus, packet service characteristics, such as response time, can be analyzed. The effectiveness and flexibility of the proposed method are demonstrated by implementing a number of existing factors on heterogeneous networks environment.

• The Journal of the Convergence on Culture Technology
• /
• v.9 no.2
• /
• pp.475-481
• /
• 2023

Softwares, especially like machine learning applications, affect human's life style tremendously. Accordingly, the importance of the cost model for softwares increases rapidly. As cost models, LOC(Line of Code) and M/M(Man-Month) estimates the quantitative aspects of the software. Differently from them, FP(Function Point) focuses on estimating the functional characteristics of software. FP is efficient in the aspect that it estimates qualitative characteristics. FP, however, has a limit for evaluating machine learning softwares because FP does not evaluate the critical factors of machine learning software. In this paper, we propose an extended function point(ExFP) that extends FP to adopt hyper parameter and the complexity of its optimization as the characteristics of the machine learning applications. In the evaluation reflecting the characteristics of machine learning applications. we reveals the effectiveness of the proposed ExFP.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.12 no.3
• /
• pp.223-237
• /
• 2010

The initial heating rate is well known as one of the most influencing factors on the occurrence of spalling and the loss of strength in concrete after fire initiation. In this study, a series of fire tests were carried out at different initial heating rates to find out its effects on the deterioration of tunnel structural members. Heat transfer analyses combined with an element elimination model were also carried out to verify its applicability in the same conditions as the fire tests. Moreover, the convection heat transfer coefficients compatible with fire test results were derived from parametric studies. In this course, their time-dependent variations were also analyzed at different initial heating rates. Finally, a numerical formula to estimate the heat transfer coefficients at the various initial heating rates was proposed by the interpolation of the results of numerical analyses.

• Proceedings of the Korean Society for Quality Management Conference
• /
• 2004.04a
• /
• pp.357-364
• /
• 2004

본 연구의 목적은 가상강좌의 만족을 설명할 수 있는 정보시스템 적 고려와 수업 적 변수가 동시에 고려된 연구모형을 제안하고 이에 대한 실증적 검증을 하는 것을 목적으로 한다. 수강생이 지각하는 가상강좌의 품질은 크게 정보기술에 대한 품질과 수강과목에 대한 품질로 나될 수 있다. 수강과목에 대한 품질은 다시 수업 내용에 대한 컨텐츠의 품질과 온라인 및 오프라인에서 제공되는 인적인 서비스 즉, 해당 교수나 조교수의 서비스 품질로 구분될 수 있고, 정보기술에 대한 품질은 정보기술로서의 가상강좌 사용에 관련된 두 가지 믿음인 사용용이성과 유용성에 의해 측정될 수 있다. 한편 가상강좌에서 제공되는 서비스는 정보기술 사용에 대한 자신감과 학업에 대한 자신감과 밀접한 연관을 갖고 있기 때문에 수강생이 지각하는 가상강좌의 품질은 컴퓨터 자기효능 감 및 학업 적 자기효능 감이 영향을 미칠 수 있다. 즉, 컴퓨터 자기효능 감이 사용용이성 및 유용성에 영향을 주며, 학업 적 자기효능 감은 수업만족에 영향을 미칠 수 있다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.10d
• /
• pp.22-24
• /
• 2002

아키텍쳐 기술 언어(ADL : Architecture Description Language)는 상위 추상화 수준에서의 소프트웨어 시스템의 구조와 행위를 기술하는데 필요한 아키텍쳐 모델 요소들에 대한 직접적인 표현 수단을 제공한다. ADL온 특히 명세 수준의 논리적인 아키텍처를 모델링, 분석하는데 유용하다. 그렇지만 ADL로 기술된 상위 수준의 아키텍쳐 명세가 하위 수준의 구현 시스템으로 어떻게 상세화 되는지 알기가 쉽지 않다. 즉, 상위 수준의 아키텍쳐 명세와 하위 수준의 아키텍쳐 구현 사이에 의미적 차이가 존재한다. 본 논문은 이러한 의미적 차이를 효율적으로 줄일 수 있는 방법을 찾기 위한 일차적인 연구 결과로서, C2 스타일 기반의 ADL로 기술된 아키텍쳐 모델을 Java 구현 코드로 자동 변환하는 방법을 제안한다.