• Journal of Engineering Education Research
• /
• v.16 no.1
• /
• pp.3-14
• /
• 2013

The previously developed practical inquiry activity supporting tools, deduced from the design principles and implementation principles based on the study of precedent researches and theories, applicable to conceptual learning in engineering education were implemented to an on-line learning community, a web-based Windows application, to find out its effectiveness in actual classroom situation through experimental research. The On-line learning community includes the inquiry activity menu to implement learning procedure of inquiry based conceptual learning, the functions supporting the communication among participants, the information sharing function, the scheduling function of class and inquiry activity, the mentoring function, and the evaluation of on-line activities of learners. Experimental study were also conducted in order to analyze the effects of inquiry activity supporting tools on inquiry based conceptual learning in engineering education.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.22 no.3
• /
• pp.251-258
• /
• 2009

At the stage conceptual design, combat vehicle is classified into three general categories of fire power, mobility and physical properties of system. The present research is restricted to fire power and its optimization. At the stage of conceptual designing of system, it is appropriate to consider major variables affecting fire power - including the weight of bullet, which exerts a direct influence on destroying effect, maximum range which takes long range firing in consideration. To estimate the maximum firing range, a simple interior ballistic and an exterior ballistic model were built by using the lumped parameter method, Le Duc method and point mass trajectory model. Design of experiment and regression analysis was used to derive simulations of fire power. Finally, response surface models were built and design variables were analyzed.

• Journal of the Society of Naval Architects of Korea
• /
• v.35 no.3
• /
• pp.79-87
• /
• 1998

The purpose of this paper is to develope a neurofuzzy system for a ship design which can determine efficiently design values e.g. principal dimensions and hull factors in a conceptual design. The neurofuzzy system for a ship design(NeFHull) applies a information about given input-output data to fuzzy theories and deals these fuzzificated values with neural networks, e.g. first, redefines normalized input-output data ad membership functions and then executes these fuzzficated information with backpropagation neural networks. We use a hybrid learning algorithm in the training of neural networks and examine the usefulness of suggested method through mathematical and mechanical examples.

• Journal of the Korean Society for Precision Engineering
• /
• v.24 no.7 s.196
• /
• pp.83-89
• /
• 2007

This paper represents a study on the development of the conceptual design for a skateboard by TRIZ. At first the problems of a commercial skateboard was analyzed. And its development objective was defined in connection with the theory of the system improvement trend. The developed conceptual design was compared with a commercial skateboard. The skateboard riding action analysis with a motion capture equipment shows the here developed skateboard more efficient than commercial one.

• Proceedings of the KIEE Conference
• /
• 1995.07a
• /
• pp.156-159
• /
• 1995

A superconducting power cable is one of the promising ways for transmitting huge electric power efficiently in the future. We performed a conceptual design of 154kV, 3GVA class superconducting power cable. The AC loss of superconductor was estimated by using the Bean model. The cross sectional area of stabilizer was calculated under the adiabatic condition. In this paper, the results of the conceptual design of superconducting power cable is described.

• Journal of IKEEE
• /
• v.7 no.2 s.13
• /
• pp.144-155
• /
• 2003

In this paper, a conceptual data model, called the UDM(Unified Data Model), to efficiently represent database structures related with object technology and complex structured data, is proposed. This model integrates major features of modern data models, such as E-R model, Semantic Object Model, and UML, especially from the viewpoint of database design. This model is basically a simplified, but extended version of the Object-Relationship Model, which was proposed to model complex structures of temporal-spatial multimedia data. This model incorporates some of the important semantic and structural information of modern database applications and it is designed to support all of the major logical database models, including relational, object-relational, object-oriented, and (semi-)structured databases. A special diagrammatic technique, called the UDD(Unified Data Diagram), is introduced as a tool for database design. Also, possible ways to derive logical views of data from this unified data model are presented. The proposed model can be utilized as a convenient and practical tool for conceptual database designs.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• v.y2005m4
• /
• pp.128-133
• /
• 2005

In this study, performance design programs for components of a turbopump unit (TPU) in a Liquid Rocket Engine (LRE), that has non-cryogenic centrifugal pumps and 1-stage impulse turbine with partial admission nozzle, were developed. The programs were integrated in a TPU module by balancing the mass flow rate for pump-turbine power, and the module was inserted into the LRE system conceptual design program. The fundamental design conditions, satisfying LRE system requirements and minimum mass flow rate condition of gasgenerator, were found and compared with data from a Russian liquid rocket engine.

• Journal of the Korea Society of Computer and Information
• /
• v.7 no.4
• /
• pp.83-88
• /
• 2002

Large sets of conceptual schema have been constructed for database design. In recent times, the need of analytic aid for schema reuse is increasing. In this paper, it is presented analysis technique of conceptual schema, and experimented schema analysis for extraction of reference schema. It is desirable for integration of related schema to have been applied in case of similarity value above 0.6. Reference schema which is created through the analysis technique enable to describe concepts of them and can be the way of schema reuse. And a feature analysis can be effective measure to set details of analytic data which is necessary for extraction of reference schema.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.15 no.3
• /
• pp.843-854
• /
• 1991

본 연구에서는 제반 설계이론과 방법론을 적용하여 기존의 모델들이 가지고 있는 결점을 극복할 수 있는 독창적인 인공심장을 설계하고, 그 결과 시스템 설계에 있어서의 체계적인 설계방법론 적용의 타당성과 효율성을 입증하고자 한다. 또한 그 과정에서 인공장기 설계시에 만족시켜야 할 원칙을 제시하고, 그러한 원칙을 효과 적으로 만족시킬수 있는 새로운 설계원리를 탐구하고자 한다.

• Journal of Energy Engineering
• /
• v.4 no.1
• /
• pp.52-58
• /
• 1995

석탄가스화 복합발전 플랜트의 시스템설계를 위한 engineering package의 체계 및 방법론에 대해 소개하였다. Engineering package는 플랜트 전체 개념설계 과정과 주요 공정을 구성하는 요소에 대한 설계/해석/시험 과정으로 나누어 진다. 개념설계과정은 설계목적과 제한조건을 충족시키도록 플랜트구성 설계, 정적/동적 시뮬레이숀, 요소별 설계사양 결정 및 Data Base Management System으로 이루어지며, 개념설계 과정의 한부분인 주요요소의 설계는 1차원 성능해석, 2/3차원 열유체해석 및 실험 그리고 구조, 진동 해석 등으로 구성되는 반복적 과정이다. 그러므로, 본 연구에서는 이러한 설계체계들의 개발전략을 설명하고, 현재 이루어진 추진결과에 대해 설명하였다.