• Journal of Astronomy and Space Sciences
• /
• 제40권1호
• /
• pp.1-10
• /
• 2023

Korea Polar Research Institute (KOPRI) and Korea Astronomy and Space Institute (KASI) have been participating in the European Incoherent Scatter (EISCAT) Scientific Association as an affiliate institution in order to observe the polar ionosphere since 2015. During the period of December 16-21, 2016 and January 3-9, 2018, the observations for the polar ionospheric parameters such as the electron density profiles, ion drift, and electron/ion temperature are carried out in the polar cap/cusp region by the EISCAT Svalbard radar (ESR). The purpose of the observations is to investigate the characteristic of the winter ionosphere in the dayside polar cap/cusp region. In this paper, we briefly report the results of the ESR observations for winter daytime ionosphere and also the simultaneous observations for the ionosphere-thermosphere system together with the balloon-borne instrument High-Altitude Interferometer WIND Experiment (HIWIND) performed by the High Altitude Observatory (HAO), National Center for Atmospheric Research (NCAR). We further introduce our research activities using long-term EISCAT observations for the occurrence of ion upflow and the climatology of the polar ionospheric density profiles in comparison with the mid-latitude ionosphere. Finally, our future research plans will briefly be introduced.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2010년도 춘계 학술발표회
• /
• pp.208-212
• /
• 2010

The high-speed railway consists of tracks, gravel ballast and subgrade, and the dynamic load is passed to subgrade through track and gravel ballast. The relaxation condition of the gravel ballast is able to be evaluate relatively and to be repaired through a continuous management, but it is difficult to evaluate the condition of subgrade, which is final part of supporting dynamic load and to repair it when made a problem. The gravel ballast and subgrade are evaluated by determining shear wave velocity. To evaluate ballast and subgrade, a good method to determine shear wave velocity is a non-destructive experiment such as surface wave tests providing a prompt experiment because an experiment in railway has a lot of tests which are carried out following railway directions and needs to prevent damage of the system. In general, a railway has limitation of an experimental space by narrow width, sleeper and etc., and background noise by a reflector exists. The existing surface wave tests need a minimum space, and it is difficult to get a reliable test results on account of background noise effect. Therefore, it is difficult or impossible to apply to existing surface wave test of subgrade and ballast. In this study, the HWAW method is applied to determine a shear wave velocity profile of the underground. The HWAW method is the experiment which is able to be carried out on a narrow space, and it determines share wave velocity of a site by measuring the wave from surface sources on the same spot. In addition, it removes effects of background noise accordingly to a signal processing using harmonic wavelet transforms, so it is useful to evaluate subgrade of a high-speed railway in the narrow space and the situation of background noise. In order to check an application of the HWAW method, an experiment is carried out on a high-speed railway field and a test result is compared to boring results.

• 한국엔터테인먼트산업학회논문지
• /
• 제13권2호
• /
• pp.57-65
• /
• 2019

본 연구는 산림 자원의 다양한 효과 중에서 정서적인 안정과 같은 심리적 요인에 대한 과학적 접근이다. 본 연구를 진행하기 위하여 산림 치유공간을 다양한 공간으로 설정하여 피실험자들을 대상으로 실험을 진행하였다. 본 실험에 참여한 피실험자들은 20대 대학생들로 평균 나이가 22±1.25세였다. 피실험자들은 지정된 각기 다른 산림치유공간에서 주관적 서열평가를 통해 감성 단어들에 대한 평가를 실시하였다. 또한 이들의 인식하는 감성에 대한 생체반응을 측정하여 실제로 인지하고 있는 감성적 상태를 확인하였다. 본 연구에 적용된 생체신호반응 실험으로는 심박이 나타내는 BMP, SDNN, VLF, LF, HF, Amplitude 및 PPI를 활용하였다. 본 실험의 결과는 통계적 처리를 위해여 Friedman 검증과 Wilcoxon 검증을 적용하여 측정하였다. 본 연구에서는 주관적 감성어휘별에 대해서는 '좋은', '맑은' 및 '불편한' 단어가 산림치유공간의 지점별로 통계적 유의성을 확인하였다. 또한 산림 치유공간 각 지점에서의 정량적 생체신호 측정결과는 SDNN, HF 및 Amplitude가 통계적으로 유의하게 나타났다. 본 연구는 산림치유공간의 다양한 지역적 공간에서 인간이 인지하는 감성적 차원을 측정하였다. 산림 공간에 있어서도 공간적 입지가 인간의 감성적 차원을 유도하는 분위기가 다르다는 것을 확인한 것이다. 본 연구의 결과를 기반으로 산림치유공간 및 산림 자원의 활용 분야에 대한 적용방향과 전략적 활용방안을 제시할 수 있다. 이는 감성 기반의 산린 치유에 대한 공간적 시설 및 물리적 요건들을 통해 시설을 이용하는 이용객들에게 가이드를 제공할 뿐만 아니라 개인 맞춤형 감성 공간 디자인적 측면으로도 활용이 가능하다.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
• /
• 한국우주과학회 2003년도 한국우주과학회보 제12권2호
• /
• pp.26-26
• /
• 2003

During fabrication process for the large space optical surfaces, the traditional bound abrasive grinding with bronze bond cupped diamond wheel tools leaves the machine marks and the subsurface damage to be removed by subsequent loose abrasive lapping. We explored a new grinding technique for efficient quantitative control of precision CNC grinding for space optics materials such as Zerodur. The facility used is a NANOFORM-600 diamond turning machine with a custom grinding module and a range of resin bond diamond tools. The machining parameters such as grit number, tool rotation speed, work-piece rotation speed, depth of cut and feed rate were altered while grinding the work-piece surfaces of 20-100 mm in diameter. The input grinding variables and the resulting surface quality data were used to build grinding prediction models using empirical and multi-variable regression analysis methods. The effectiveness of the grinding prediction model was then examined by running a series of precision CNC grinding operation with a set of controlled input variables and predicted output surface quality indicators. The experiment details, the results and implications are presented.

• 한국주거학회:학술대회논문집
• /
• 한국주거학회 2004년도 추계학술대회 논문집
• /
• pp.355-360
• /
• 2004

This study is a research that evaluates and analyzes on the subjective reaction of Won buddhism small sanctum through psychoacoustics experiment. For doing it, after choosing of 5 Won buddhism small sanctums of which its building volume at $400m^{3}{\sim}650m^{3}$, a psychoacoustics experiment has been conducted. Based on those A, B, C, E temple-halls which appeared as higher than 'average' in the result of subjective reaction evaluation of the Won buddhism small sanctum through psychoacoustics experiment, it could be classified as the conclusion of the factor analysis: the first factor is 'space sense of sound', the second factor is 'intimacy-feeling with sound' and the third factor is 'clearness of sound', respectively.

• 한국작물학회지
• /
• 제44권2호
• /
• pp.154-158
• /
• 1999

Volatile flavor compounds from perilla leaves were extracted and analyzed with different methods, head-space analysis (HS), simultaneous steam distillation and extraction (SDE) , and solvent extraction (SE), and to compare their efficiencies for quick analysis. Over 30 volatile compounds were isolated and 28 compounds were identified by GC/MSD. Major compound was perillaketone showing the compositions of which were 92% in SDE method, 86% in headspace analysis, and 62% in solvent extraction method. For quick evaluation of leaf flavor in perilla, it was desirable because the headspace analysis method had a shorter analyzing time and smaller sample amount than the other methods.

• 우주기술과 응용
• /
• 제2권2호
• /
• pp.104-120
• /
• 2022

도요샛(Small Scale magNetospheric and Ionospheric Plasma Experiment, SNIPE)의 과학임무는 전리권 상층부 소규모 플라즈마 구조의 공간적 시간적 변화를 관찰하는 것이다. 이를 위해 4개의 6U 큐브위성(10 kg)이 고도 약 500 km 극궤도로 발사될 예정이며, 상호 위성 간 거리는 편대 비행 알고리즘에 의해 수 10 km에서 수 1,000 km 이상으로 제어된다. 운영 초기에는 4기의 위성이 같은 궤도 평면에 위치하는 종대비행을 하다가 경도상에서 나란히 배치되는 횡대비행으로 전환하여 4기의 서로 다른 지점에서 공간적인 변화를 관측하게 된다. 도요샛에는 입자 검출기, 랑뮈어 탐침, 자력계로 구성된 우주날씨 관측 장비가 각 위성에 탑재된다. 모든 관측기는 10 Hz 이상의 높은 시간 분해능을 가지며 큐브위성에 최적화 설계되었다. 이 외에도 이리디듐 통신 모듈은 지자기 폭풍이 발생할 때 작동 모드를 변경하기 위한 명령을 업로드할 수 있는 기회를 제공한다. 도요샛은 극 지역 플라즈마 밀도 급상승, 필드 정렬 전류, 고에너지 전자의 국소 영역 침투, 적도 및 중위도 플라즈마 거품의 발생 및 시공간적 진화에 대한 관찰을 수행할 예정이며, 이를 통해 태양풍이 우주날씨에 어떠한 영향을 미치는지 탐구하게 된다. 도요샛은 2023년 상반기 러시아 소유즈-2에 의해 카자흐스탄 바이코누르에서 발사될 예정이다.

• KIEAE Journal
• /
• 제15권6호
• /
• pp.37-45
• /
• 2015

This study focuses on the human-centered diversity that is one of the important value in modern society, and the method to apply various demands for architectural space. Human begins pursue new contents and leisurely life all the time and live toward the period of high emotion with personal characteristics. With those social trends, people aggressively request subjects to satisfy their emotional attractiveness as well as comforts and pleasures beyond the functional basic requirements in space. Many studies and projects about emotion have been progressed in the fields of architectural planning and design these days. Purpose: The purpose of this study is to suggest the Multi-Purposed Emotional Space as a new alternative of space renewal that satisfy both functional programs and users emotional demands. Method: For this research, the pervious researches were investigated first to determine essential methodology and terminology to estimate and construct the multi-purposed emotional space. Result: According to survey, the multi-purposed emotional space could finally be classified by emotional words, and the results of experiment were applied for building spaces. By the above process, types of the multi-purposed emotional space and design guidelines could be suggested.

• 항공우주산업기술동향
• /
• 제6권2호
• /
• pp.60-68
• /
• 2008

원자산소, 입자복사, 진공 및 열주기 등과 같은 우주환경요소의 복합적인 영향으로 인하여 우주용 자재의 특성 및 물성치에 급격한 성능저하가 일어나게 된다. 따라서 우주환경이 자재에 미치는 특성변화 매커니즘을 이해하고 차세대 우주프로그램에 적용될 수 있는 신소재 개발을 위하여 NASA, ESA 및JAXA와 같은 선진 우주기관에서는 국제우주정거장 또는 LDEF 실험위성 등에 적용된 자재시편을 활용하여 많은 연구를 지속적으로 수행하고 있다. 본 논문에서는NASA 및 JAXA의 우주용 자재연구동향과 ESA의 우주자재 선정기준에 대하여 소개하고자한다.

• 한국실내디자인학회논문집
• /
• 제22권5호
• /
• pp.162-170
• /
• 2013

Although vision has been considered as a top sensory organ in the Western culture until modern times, the significance of space experience that communicates with a body via complex perceptions has recently garnered attention. This study criticizes the limitations of a vision-centered space and has the goal of empirically examining the sensibility characteristics in a haptic space through post-structuralism views leading up to Gilles Deleuze's philosophical ideas. This study will explore the flow of senses from the philosophical and artistic standpoint and the sensibility characteristics in a haptic space by examining the theories on haptic perceptions in connection with a space. In order to test the existing theories and identify the differences in sensibilities depending on perceptual method, the sensibilities of participants were compared using SD method (Semantic Differential scale method) and a validity test was conducted using a statistical program SPSS. The research has revealed that the average sensitivity scale of complex haptic perception was higher than single perception that only relies on vision. In addition, there was a correlation between perceptual method based on various sensory organs and human sensitivities. This study is meaningful in that it can serve a foundation for empirical research on sensibility, since it has reexamined the relationship between space and participants and demonstrated and analyzed their sensitivities through an experiment.