• 우주기술과 응용
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• 제2권1호
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• pp.1-12
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• 2022

본 논문에서는 초소형위성용 항력 증대 장치 개발에 대해 기술하였다. 최근 우주 개발이 New Space 시대에 접어들며, 소형 로켓 및 초소형위성 거대 군집 운용 등 인공물체의 저궤도 진입 장벽이 상당히 낮아지는 추세이다. 이로 인해 우주 환경에 존재하는 우주쓰레기의 수가 기하급수적으로 늘어나고 있으며, 현재 운용중인 인공위성뿐만 아니라 앞으로 발사될 인공위성들에 큰 위협으로 다가오고 있다. 이를 방지하기 위해 국제적으로 우주쓰레기 경감 대책을 제시하고 있으며, 대표적으로 IADC(Inter-Agency Space Debris Coordination Committee)에서는 '25년 가이드라인'을 권고하고 있다. 한국항공우주연구원에서는 국내 최초로 랑데부/도킹 기술검증용 초소형위성인 KARDSAT(KARI Rendezvous & Docking demonstration SATellite) 프로젝트를 진행하였으며, KARDSAT 위성의 임무 후 폐기 기동(post-mission disposal)을 위한 항력 증대 장치 개발을 통해 우주쓰레기에 대한 국제적 가이드라인을 준수하고자 하였다.

• 한국실내디자인학회논문집
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• 제21권5호
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• pp.57-64
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• 2012

The ideologie of modern society as per something to phenomenology problem is to show various different looks. The community space is spring from Greek and Roman of community place by agora and forum is make a active communicate to interpersonally. Subject to centrically In the context, this paper is study on the Sustainable development for community space about interactive space. and focusing is Response to human of interact in each other intelligent space. And this paper suggestion is composition method of community space in technology advanced, Interactive interface form for human, sustainable to community space direction elements. First, I'll rearrange the distinctive features of modern society through references of various scholars. This is to understand how interactivity affects the whole society and what is the importance of this interactive wave. Second, I'll analyze several trends of modern community space and figure the change of methodology of design based on the advancement of design technology. This is to understand the interactive relation of the subjects. Third, I'll seek how community space design has changed in modern society and under which process design is made. This is to clarify the fact that the portion of interaction will increase in future design according to the intervention of equipment, which is one of the objects of interaction space.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2006년도 한국우주과학회보 제15권1호
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• pp.50-50
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• 2006

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2005년도 한국우주과학회보 제14권1호
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• pp.48-48
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• 2005

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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• pp.104-104
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• 2004

• Journal of Positioning, Navigation, and Timing
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• 제1권1호
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• pp.59-64
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• 2012

Precise Point Positioning (PPP) has been widely used in navigation and orbit determination applications as we can obtain precise Global Positioning System (GPS) satellite orbit and clock products. Kinematic PPP, which is based on the GPS measurements only from the spaceborne GPS receiver, has some advantages for a simple precise orbit determination (POD). In this study, we developed kinematic PPP technique to estimate the orbits of GRACE-A satellite. The comparison of the mean position between the JPL's orbit product and our results showed the orbit differences 0.18 cm, 0.54 cm, and 0.98 cm in the Radial, in Along-track, and Cross-track direction respectively. In addition, we obtained the root mean square (rms) values of 4.06 cm, 3.90 cm, and 3.23 cm in the satellite coordinate components relative to the known coordinates.

• 한국항행학회논문지
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• 제4권2호
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• pp.191-200
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• 2000

최근, NORAD(북미방공사령부)의 발표에 따르면 10cm 이상의 우주물체로서 목록화 되어 관리가 되는 것 중의 단지 10%만이 임무와 관련된 것이고 나머지는 보조연료탱크, 그리고 인공위성의 잔해들로서 임무와는 상관이 없는 우주폐기물인 것으로 분석되었다. 우주폐기물의 대표적인 경우는 우주물체간의 충돌이나 폭발로 인해 발생된다. 그리고 임무 중인 인공위성에 큰 피해를 초래하게 된다. 현재 몇몇 국가에서는 지구 및 우주환경을 보호하고 인류의 안전을 위해 새로운 위성모델의 개발을 추진 중이다.

• 유통과학연구
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• 제21권9호
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• pp.81-91
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• 2023

Purpose: The article aims to assess the possibilities and contribution of countries to the creation and distribution of knowledge circulating in the scientific and technological space of the EAEU. Research design, data, and methodology: To understand the conditions and possibilities for the distribution of knowledge, the methodology of the quality of economic space used. The space is considered through density, placement, connectedness, and asymmetry. Used bibliometric analysis, balance of payments analysis, and integration indicators. Results: The study showed that low barriers, including language, created visible advantages in the mutual distribution of knowledge. However, the geo-technological space of the EAEU is polarised and has differences in the density and distribution of scientific resources. Asymmetries are shown in the distance between countries in multidirectional trends. Cooperation between countries has a different level of interaction. Conclusions: The internal resources of the geo-technological space of the EAEU are limited, and most of the needs are covered by external sources. Some mechanisms of the scientific policy of countries in scientific careers act as «demotivates» for distributing knowledge within the EAEU. Countries need to improve the quality of services and trade data to better understand technology distribution processes through bilateral channels.

• 한국실내디자인학회논문집
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• 제23권3호
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• pp.100-107
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• 2014

Traditional architectural space, which is a historical cultural heritage must be connected mutually as a organic flow of various elements such as the environment of the time, political background and values, rather than approaching with fragmentary point of view. The Silhak Philosophy, the basis of late Chosun society developed equity thoughts on the basis of ideology of humanism, and it asserted the promotion of technology and industry as a measure to realize the pursuit of truth which is practically useful. Thus, we could verify the possibility of convergent interpretation of cultural technology of Hwaseong architectural space through the humanistic viewpoint of pioneer spirit of Silhak Philosophy which regards human as a main agent of desire of life, and the pursuit of truth which is useful for reality, and the realization of ethical value by aesthetic practicalism. Based on this, the ontological meaning and value of Suwon Hwaseong by the viewpoint of convergence of culture and technology have been drawn as the construction of planned new town by the practice of filial duty, the plan of city space based on rational values, the realization of a metropolis where self-sufficient economic activities are possible, the introduction of thorough construction management system, the introduction of advanced culture and its creative application, and the application of scientifical knowledges and cutting-edge technology.

• Nuclear Engineering and Technology
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• 제49권1호
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• pp.134-140
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• 2017

A well-performed core power control to track load changes is crucial in pressurized water reactor (PWR) nuclear power stations. It is challenging to keep the core power stable at the desired value within acceptable error bands for the safety demands of the PWR due to the sensitivity of nuclear reactors. In this paper, a state-space model predictive control (MPC) method was applied to the control of the core power. The model for core power control was based on mathematical models of the reactor core, the MPC model, and quadratic programming (QP). The mathematical models of the reactor core were based on neutron dynamic models, thermal hydraulic models, and reactivity models. The MPC model was presented in state-space model form, and QP was introduced for optimization solution under system constraints. Simulations of the proposed state-space MPC control system in PWR were designed for control performance analysis, and the simulation results manifest the effectiveness and the good performance of the proposed control method for core power control.