• International Journal of Aeronautical and Space Sciences
• /
• 제18권1호
• /
• pp.154-164
• /
• 2017

This work conducts a validation study for the XH-59A helicopter using a rigid coaxial rotor system in order to establish the techniques of the conceptual design and performance analysis for the lift-offset compound rotorcraft. As a tool for conceptual design and performance analysis, NDARC (NASA Design and Analysis of Rotorcraft) is used for the present study. An assumed mission profile is considered for the conceptual design of the XH-59A. As a validation result of the design, the dimensions and weight of the XH-59A are appropriately designed when compared to the target values since the relative error is less than 0.5%. Then, performance analyses are conducted for the designed XH-59A model with and without auxiliary propulsion in hover and forward flight conditions. The present analyses show good validity since the prediction results compare well with both the flight test and previous analyses. Therefore, the techniques for the conceptual design and performance analysis of the lift-offset compound helicopter are overall considered to be appropriately established. In addition, this study investigates the influence of the lift-offset on the rotor effective lift-to-drag ratio of the XH-59A helicopter with auxiliary propulsion. As a result, the improvement of the rotor effective lift-to-drag ratio can be obtained by appropriately increasing the lift-offset in high-speed flight.

• 한국과학교육학회지
• /
• 제24권2호
• /
• pp.320-326
• /
• 2004

이 연구에서는 화학 영역에서 수리 문제 해결과 개념 문제 해결이 서로 영향을 미치는지를 조사하였다. 서울 소재 고등학교에서 사전 화학 성적이 유사한 4학급(N=112)을 선정하여 AC(Algorithmic-Conceptual problem) 집단과 CA(Conceptual-Algorithmic problem) 집단으로 무선 할당하였다. AC 집단의 학생들은 수리 문제 해결에 대한 학습을 수행한 후 개념 문제를 해결하였으며, CA 집단의 학생들은 개념 문제 해결에 대한 학습을 수행한 후 수리 문제를 해결하였다. 연구 결과, 수리 문제 해결에 대한 학습은 관련된 개념 문제의 해결력을 향상시켰으나, 개념 문제 해결에 대한 학습은 관련된 수리 문제의 해결력에 도움이 되지 못하는 것으로 나타났다. 문제 해결에 대한 자신감에서는 수리 문제 해결에 대한 학습이 관련된 개념 문제에 큰 영향을 주지 못했으며, 개념 문제 해결에 대한 학습도 관련된 수리 문제 해결에 대한 자신감에 큰 영향을 주지 못했다.

• 한국건축시공학회지
• /
• 제10권2호
• /
• pp.133-138
• /
• 2010

건축 프로젝트에서 개산견적은 많은 부분들이 확정되지 않은 상태에서 수행되기 때문에 개산견적으로 산출된 공사비와 실제 시공 공사비는 차이가 발생할 수밖에 없다. 이러한 공사비의 차이를 신뢰할 수 있는 수준 이하로 관리할 필요가 있다. 따라서 본 연구에서는 건축 프로젝트 초기단계에서 실시하는 개산견적의 신뢰도를 관리할 수 있는 체계적인 프로세스를 구축하는 것을 목적으로 한다. 본 연구를 수행하기 위하여 개산견적 전문가와 면담조사를 실시하였으며, 리스크 관리 프로세스에 대한 고찰도 실시하였다. 연구결과 개산견적 신뢰도 관리를 위해서는 기존의 개산견적 프로세스에 신뢰도를 평가와 향상 방안 도출 과정이 필요하며, 유사 프로젝트를 토대로 신뢰도 관리 전략 수립 과정이 필요하다. 이러한 과정을 통해서 개산견적의 신뢰도를 당초에 설정된 허용가능한 수준 이하로 관리하여 프로젝트 공사비에 대한 리스크를 감소시켜 프로젝트를 성공적으로 수행할 수 있게 도움을 줄 수있다.

• 국제학술발표논문집
• /
• The 6th International Conference on Construction Engineering and Project Management
• /
• pp.708-709
• /
• 2015

In Korea, a series of noise-reduced aluminum forms are being recently used in apartment housing construction. However, their complicated and time-consuming work processes, and the noise which is still generated due to the inherent property of aluminum when especially installing and dismantling them are have been pointed out as a problem to be certainly solved for increasing their practical use in construction sites. The primary objectives of this study are to propose a conceptual design of a newly designed noise-reduced aluminum form in which the noise can be enormously decreased during form works. The conceptual design in this study improved problems of conventional system aluminum forms, and, later, a system aluminum form developed based on this conceptual design will be able to ensure noise-reduction and safety as well as excellent applicability.

• 한국의류학회지
• /
• 제28권11호
• /
• pp.1458-1469
• /
• 2004

In this study, color names focusing on the purple series, appearing in the clothing of the Joseon Dynasty, were classified systematically, and the conceptual meaning of each name were investigated through various methods. The results are as follows; First, the color names of purple-series were classified systematically. According to the integration scheme of morphemes, color names could be divided into two categories; single names and composite names. Color names could also be classified into universal and limited names according to the areal distribution of literatures. Secondly, the conceptual meaning of the color names of purple-series were considered. The conceptual meaning could be divided into two categories; one 'etymological and dyeing methodological meaning', the other 'color systematic meaning' By studying the dictionary definition of color names, comparing and analyzing the material composition of colors, the etymological and dyeing methodological meaning could be grasped. Furthermore, the color systematic meaning of each name could be grasped through the cluster analysis of L*, a*, b* values measured from the relics of clothing. Thirdly, the conceptual semantic structure were established on the basis of conceptual meanings of purple-series color names. The conceptual semantic structure of purple-series color names is forming discrete structure with the dyeing method and material of dyes as their semantic components.

• 한국군사과학기술학회지
• /
• 제9권3호
• /
• pp.56-65
• /
• 2006

It is well known and widely accepted that the conceptual design is the most influential step in the design process of a product or a system and that about 75% of the life cycle cost is committed as the results of this stage. The purpose of this paper is to present and demonstrate the step of ICDM(Integrated, Customer Driven, Conceptual Design Method) for the development of a ground launcher system, TEL(Transporter, Erector and Launcher). The results of the study show the effectiveness of the method during the conceptual design phase of new complex systems or high-tech products.

• International Journal of Computer Science & Network Security
• /
• 제21권3호
• /
• pp.153-164
• /
• 2021

The increasing importance of such fields as embedded systems, pervasive computing, and hybrid systems control is increasing attention to the time-dependent aspects of system modeling. In this paper, we focus on modeling conceptual time. Conceptual time is time represented in conceptual modeling, where the notion of time does not always play a major role. Time modeling in computing is far from exhibiting a unified and comprehensive framework, and is often handled in an ad hoc manner. This paper contributes to the establishment of a broader understanding of time in conceptual modeling based on a software and system engineering model denoted thinging machine (TM). TM modeling is founded on a one-category ontology called a thimac (thing/machine) that is used to elaborate the design and analysis of ontological presumptions. The issue under study is a sample of abstract modeling domains as exemplified by time. The goal is to provide better understanding of the TM model by supplementing it with a conceptualization of time aspects. The results reveal new characteristics of time and related notions such as space, events, and system behavior.

• 한국해양공학회지
• /
• 제11권4호
• /
• pp.205-212
• /
• 1997

The major subject of this paper is the conceptual design of a cable-buoy system based on mechanics of floating bodies and mooring lines. The goal is to present a systematic relevant analysis procedure for the conceptual design of oceanographic buoy systems. The dynamics of a free floating body with an anchoring line is studied and a model is proposed through the primary engineering.

• 공학교육연구
• /
• 제22권2호
• /
• pp.16-27
• /
• 2019

In order to note some points necessary for developing the cornerstone design course concentrating on conceptual design through that students acknowledge that engineering design is not to make things but to produce knowledge not only meet requirements of clients, users, and stake holders but also to solve problems, this paper describes the contents for the course that covers conceptual design as well as embodiment design, explains some ways and tools both for guiding students and for asking for study of lecture materials, and discuss things to be considered when faculty designs the course.

• 인문언어
• /
• 제8집
• /
• pp.409-427
• /
• 2006

This paper deals with the various conceptual metaphors of 'mind' in Korean and English within the Cognitive Semantics. The purpose of this paper is to investigate the metaphorical expressions of the concept 'mind' represented andunderstood in various ways in Korean and English, to find out the linguistically-universal conceptual metaphors underlying the uses of the metaphoric expressions. In addition, this paper discusses the differences in linguistic realization of the concept 'mind' between Korean and English from the socio-cultural background. In the traditional view, metaphor was thought only as the linguistic matters and a deviance from literal or normal use. However, within the Cognitive Linguistic view such as Lakoff and Johnson(1980), metaphor has been considered as a means of understanding and conceptualizing world. According to them, metaphor is found in everyday life because it is not only as a matter of language but also as a nature of human conceptual system controlling cognition, thought and behavior. Conceptual metaphor is suggested as a device to understood abstract and less familiar things through concrete and more familiar things. Conceptual metaphors may be realized linguistically as well as non-linguistically, in the form of movies, arts or behavior. To define the concept 'mind' shared among the Koreans, conceptual metaphors used to represent 'maum(mind)'in Korean are examined. Then they are compared with the ones used to represent 'mind' in English. This is based on the idea that conceptual metaphors represented in linguistic expressions naturally reflect the speakers' concept and conceptualization is a universal irrespective of language. This paper exemplifies the Korean sentences as well as English sentences to utilize some conceptual metaphor such as Johnson(1987)'s THE MIND IS THE BODY and shows many other conceptual metaphors used in Korean and English to represent the same concept 'mind'. What are some metaphors shared by two languages and what is specific to one of them will be shown, too. This paper also suggests that the different conceptualization or lexicalization is partly due to the effect of the oriental cultural background that is more interested in the mental world than the physical world.