• The Journal of Sustainable Design and Educational Environment Research
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• v.20 no.4
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• pp.1-12
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• 2021

This study aims to propose a planning direction based on the results of domestic case studies and expert advice as a basic research to establish a specific implementation model for kindergarten education space in response to changes in future society and future education by escaping from the issues and facility limitations of existing kindergarten education space. To this end, it is intended to contribute to the positive effect of future education policies by being used as basic data for building specific implementation models through review of the 'Nuri' course, domestic case analysis, and revision of specific standards for kindergarten facility planning. The main research results were case analysis and advisory consultations to derive facility standards and planning directions divided into layout plans, general classrooms, support facilities, public spaces, and external spaces, and a process for identifying and systematizing space-influencing factors based on the facility standards derived in this basic study is needed hereafter.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.50 no.4
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• pp.277-285
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• 2022

There has been significant increase in demand of launch opportunities from the small satellite sector that represents the new space era. Providing smallsat-dedicated launch service at an affordable price is a new business model many startup companies have pursued, which requires innovative solutions for cost reduction in combination of low cost components, volume production and optimized manufacturing. We set out a preceding study at KARI to develop a suite of critical and cost-cutting technologies in preparation for a two-staged small launch vehicle development, based on the liquid rocket engine technologies developed from the Nuri program in accordance with the 3^rd master plan for national space development. In this work, we introduce the concept of a two-staged small launch vehicle that aims to be innovative and cost competitive for small satellites, and describe mission design results including staging as well as overall vehicle configuration of the launch vehicle.

• KIPS Transactions on Computer and Communication Systems
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• v.12 no.12
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• pp.347-356
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• 2023

In the recent war between Ukraine and Russia, low-orbit satellite communication played a major role, and Korea laid a foothold for low-orbit satellite communication services with the successful launch of Nuri in May 2023 and entered a full-scale civilian space age competition. In order to create an ecosystem for ICT digital transformation and data convergence in the field of low-orbit satellite communication, this paper conducts user sentiment analysis by importing posts from Reddit, one of the world's SNS, and extracts need-related sentences through need mining to identify user needs, performs topic modeling to classify topics, and prepares an action plan according to these topics. We hope that this study will be used as a policy resource for the development and innovation of new business models in the field of low-orbit satellite communication, bridging the digital information gap and solving social problems, contributing to sustainable digital transformation and enhancing soft power.

• Journal of Advanced Navigation Technology
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• v.26 no.6
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• pp.487-495
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• 2022

This paper describes the design and development of a high-power transmit receive module(TRM) for mounting on X-band synthetic aperture radar(SAR) of the NEXTSat-2. The TRM generates a high-power pulse signal with a bandwidth of 100 MHz in the target frequency range of X-band and amplifies a low-noise on the received signal. Tx. path of the TRM has output signal level of more than 200 watts (53.01 dB), pulse droop of 0.35 dB, signal strength change of 0.04 dB during transmission signal output, and phase change of 1.7 ˚. Rx. path has noise figure of 3.99 dB and gain of 37.38 ~ 37.46 dB. It was confirmed the TRM satisfies all requirements. The TRM mounted on the NEXTSat-2 flight model(FM) which will be launched using the KSLV-II (Nuri).

• Journal of Advanced Navigation Technology
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• v.28 no.2
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• pp.193-200
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• 2024

This paper describes the design and development of a transmit receiver module(TRM) for mounting on X-band SAR of the NEXTSat-2. The TRM generates the chirp signal with required bandwidth through the DDS in X-band and performs frequency conversion, combination for the signal to transmit and be received and frequency synthesis. Tx path of the TRM produces signals of total 28 bandwidths up to 96.8 MHz and has output signal level of more than + 9.37 dBm. Rx path of the TRM has minimum noise figure of 15.7 dB. The measurement results show that required requirements are satisfied. The TRM is installed on the NEXTSat-2 flight model(FM), launched by KSLV-II(Nuri) on May 23, 2023 and currently operational.

• Korea Science and Art Forum
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• v.19
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• pp.659-668
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• 2015

The Korean education program and environment do not meet the increasing demand of daycare by facility, manpower, and budget deficits although Korea has also been interested in the convergent human resource with integrated ideas by creative education since the introduction of the Nuri curriculum for 5 year old children in 2011. Thus, the purpose of this study is to establish the preschool education program and design the proper space for developing the creativity of children. The procedure of this study is as follows. First, this study proposes the direction for establishing the daycare programs after examining the existing Korean daycare facilities and programs based on documented references about designs for daycare facilities. Second, this study proposes the program plans based on the framework establishment for developing preschool education programs by combination of 5 types of children's behavior on play and 5 types of formative principles for creative education with play. Third, this study proposes the direction of designs and conditions of daycare facilities for effectively managing the programs previously mentioned. As a result of theprocedure, this study comprehensively delineates the education program models and space plans for developing the creativity of Korean children, and suggests the necessity of development model of continuous education program by establishment of frameworks and the significance of space for effectively managing the model.