• 천문학회보
• /
• 제43권1호
• /
• pp.52.2-53
• /
• 2018

A stationary Type IV (IVs) radio burst was observed on September 24, 2011. Observations from the Nançay RadioHeliograph (NRH) show that the brightness temperature (TB ) of this burst is extremely high, over 10^11K at 150 MHz and over 10^8K in general. The degree of circular polarization (q ) is between -60%~-100%, which means that it is highly left-handed circularly polarized. The flux-frequency spectrum follows a power-law distribution, and the spectral index is considered to be roughly -3~-4 throughout the IVs. Radio sources of this event are located in the wake of the coronal mass ejection and are spatially dispersed. They line up to present a formation in which lower-frequency sources are higher. Based on these observations, it is suggested that the IVs was generated through electron cyclotron maser emission.

• 한국콘텐츠학회논문지
• /
• 제20권6호
• /
• pp.279-292
• /
• 2020

본 연구에서는 멀티플랫폼 환경에서 지상파TV의 채널브랜드자산이 시청자들의 지상파 콘텐츠 선택과 이용에 미치는 영향을 점검하였다. 연구결과, 지상파TV 채널브랜드자산이 멀티플랫폼 상 지상파TV 콘텐츠 이용 정도에 미치는 영향은 SBS인지도만이 지상파TV 콘텐츠 이용 정도에 유의미한 영향을 미치는 것으로 나타났다. 지상파TV 채널브랜드자산이 지상파 콘텐츠 시청 매체의 다양성에 미치는 영향은 어떤 채널에서도 유의미하지 않은 것으로 나타났으며, 지상파 콘텐츠 시청 플랫폼 유형별 이용에 미치는 영향은 지상파TV 채널별로 플랫폼 유형에 따라 차이를 보이는 것으로 나타났다. 더불어, 지상파TV 채널브랜드자산이 지상파 콘텐츠 이용 장르의 다양성에 미치는 영향은 KBS인지도와 SBS인지도만이 지상파TV 콘텐츠 이용 장르의 다양성에 유의미한 영향을 미치는 것으로 나타났다. 마지막으로, 지상파 채널브랜드자산이 지상파TV 콘텐츠 장르 유형별 이용에 미치는 영향은 각 채널별로 특정 장르유형을 중심으로 다르게 나타났다. 본 연구의 결과는 채널브랜드자산이 멀티플랫폼 상에서 시청자들의 지상파TV 콘텐츠 선택 및 이용에 부분적이나마 영향을 미친다는 것을 제시해주며, 이는 경쟁적인 매체환경에서 방송채널의 경쟁력 강화를 위해 의미있는 시사점을 제공해 준다.

• 해양환경안전학회지
• /
• 제19권3호
• /
• pp.233-240
• /
• 2013

Jakarta is the capital city of Indonesia which has problems of land subsidence with the rates of about 1 to 15 cm/year, up to 20-25 cm/year. The study has examined the land subsidence in Pantai Mutiara, Jakarta Bay which is a reclaimed area by using the Terrestrial LIDAR survey technique. The Terrestrial LIDAR survey results show that the survey site has mean elevation of 0.24 m with the highest elevation of 0.93 m and lowest - 0.35 m. Considering that AHHW (approximate highest high water) is 0.51 m, many areas of the survey site are lying below the AHHW. Pantai Mutiara area is showing various subsidence rates depending on sites although the site is relatively narrow and small (about 1 $km^2$). There is elevation differences of almost 1m within the site. In this study, key information including topography, dike height distribution, and future coastal flooding risk of the survey area was able to be provided by Terrestrial LIDAR survey conducted only once. Especially, as the 3D precision topography effectively conveys important messages relating to vulnerability of the site, policy makers and stakeholders can easily understand the situation of the site.

• Journal of Positioning, Navigation, and Timing
• /
• 제11권4호
• /
• pp.229-238
• /
• 2022

This paper addresses on the International technical trends, standards, and development status of terrestrial radionavigation system to provide more accurate and fail-safe Positioning, Navigation, and Timing (PNT) Information available in maritime navigation environment. We analyze the performance result of pilot service in enhanced Long range navigation (eLoran) testbed environment using Low Frequency (LF) signal, and describe the development status of Ranging-Mode (R-Mode) system using Medium Frequency (MF) and Very High Frequency (VHF) to meet the Harbor Entrances and Approaches (HEA) requirement of International Maritime Organization (IMO) within 10m position accuracy. Furthermore, we present an architecture for integrated service of satellite-terrestrial navigation system and future maritime applicable fields. As the core information infrastructure of future navigation for 4th industrial revolution, this paper will be contributed to determining the direction of present and future to provide fail-safe PNT service with Global Navigation Satellite System (GNSS) based on the technical enhancement of terrestrial integrated navigation system.

• 디지털산업정보학회논문지
• /
• 제8권2호
• /
• pp.117-130
• /
• 2012

Due to the development of network and device, it is called mobile age that boosts various distribution routes of multi-media content and it constructs a new digital content consumption trend. N-screen is one of the new-introduced examples in the digital age and broadcasting industry believes it as a crisis and challenge as well. It becomes a ubiquitous multi-media environment that people watch multi-media content everywhere and any time they want to and competition happens beyond the boundaries such as network industry, terminal industry, pay TV market, traditional terrestrial TV, etc. And then how should the broadcasting service prepare for the N-screen business? The present research proposes a few terrestial broadcasting content strategies in the multi platform environment. First, instead of N-screen, it proposes multi platform, especially One Source Multi Platform(OSMP). Second, so-called 'Integrated Terrestrial Broadcasting OSMP Alliance(IBPA)' must be founded. Third, IBPA should support multi-tasking UX for viewers to have rich experience. Last, it becomes more important and necessary to support local terrestrial broadcasting service for public service in the multi platform age.

• 교육녹색환경연구
• /
• 제6권2호
• /
• pp.25-52
• /
• 2007

This paper is focused on the economical efficiency of the geothermal heat pump system in school. As the importance of problems of environment and energy becomes larger, the development and distribution of energy-saving technology in the whole nation has become influential. This paper is intended, targeting on school buildings scattered all over the country, to evaluate the introduction and possibility of a terrestrial heat system which is in the first stage of introduction in the country, through energy consumption and efficiency in case where a terrestrial heat system is introduced. To do that, the author performed a qualitative analysis of the heat pump system using various terrestrial heat energy and the system introduced to existing school buildings and, through the analysis, made tentative evaluation on the most environment-friendly and energy saving type system. Also, the author performed simulation analysis using a currently typical school building standard and, on the basis of this result, conducted efficiency analysis of various heat pump systems. The conclusion according to synthetical analysis & evaluation can be summarized as follows. In case a heat pump system is introduced to a school building, it was deemed the investment in the early stage would increase, but the investment could be collected within 5~6 years through reduction of large operation expenses. Also, it was analyzed in case of terrestrial heat contracted heat mode using midnight electric power among heat pump systems, not only early investment but also operation expenses could be reduced to a great extent. Accordingly in case the system using terrestrial heat energy is applied to the school buildings that are to be newly built or repaired in the future, it will provide an object-lesson to students as well as contributing to energy saving.

• Asian Journal of Atmospheric Environment
• /
• 제3권1호
• /
• pp.27-41
• /
• 2009

Internally mixed states of submicron particles during transport from the Asian continent to the Pacific Ocean were analyzed using a single-particle time-offlight mass spectrometer. The observation was conducted at Tsukuba in Japan in the spring of 2005 in order to investigate springtime transport of particles from the continent. The sum of ion intensities of sulfate (${HSO_4}^-$) detected in particles originating from the continental air masses counted for 75% of that in all particles during the observation. By analyzing correlations among compounds, origins and internally mixed states of compounds were estimated. It was found that nitrate was mixed with sulfate-rich particles as the air mass approached Japan. It was confirmed that Asian mineral dust particles played significant roles for transport of continental sulfate to Japan. As a result of analysis on internal mixing of chlorine and nitrate, it was implied that the chlorine loss in fine sea salt particles had already proceeded at Tsukuba. It was characteristic that fluoride ions were significantly detected, coal combustion in the Asian Continent can be an important source of fluorides detected in Japan through the westward transportation of fine particles including fluorides.

• 방송공학회논문지
• /
• 제17권6호
• /
• pp.1080-1090
• /
• 2012

본 논문에서는 모바일 단말기를 통한 방송 콘텐츠 이용행태, 방송 통신 서비스 수신환경, 그리고 지상파 방송의 보편적 서비스 및 공익적 서비스 제공 의무에 따른 이용자 인식에 따라 지상파 방송의 디지털 전환 이후 700 MHz 주파수 대역의 할당 및 주파수 경매 선호에 대해 조사하였다. 본 연구결과를 요약하면 첫째, 모바일 단말기를 통한 DMB 이용시간이 많은 사람일수록 여유 주파수가 통신에 할당되어야 한다는 응답이 많았고, 둘째, 기술적 측면에서 디지털 지상파 방송의 수신 상태나 IP를 통한 동영상 수신 상태는 여유 주파수 할당 선호에 아무런 영향을 주지 못했다. 마지막으로 지상파 방송의 보편적 서비스가 중요하다고 인식할수록 방송용 주파수 경매가 필요 없다고 응답하였으며, 방송의 공익적 서비스 제공 의무에 대한 인식의 차이는 유의미한 영향을 주지 않는 것으로 나타났다. 이러한 분석 결과를 통해 미래의 지상파방송은 수신환경 개선이 가장 기본적인 과제라는 것을 알 수 있었다.

• 천문학회지
• /
• 제34권4호
• /
• pp.317-319
• /
• 2001

The response of the earth's magnetosphere to the variation of the solar wind parameters and Interplanetary magnetic field (IMF) has been stud}ed by using a high-resolution, three-dimension magnetohydrodynamic (MHD) simulation when the WIND data of velocity Vx, plasma density, dynamic pressure, By and Bz every 1 minute were used as input. Large electrojet and magnetic storm which occurred on October 21 and 22 are reproduced in the simulation (fig. 1). We have studied the energy transfer and tail reconnect ion in association with geomagnetic storms.

• 한국환경과학회지
• /
• 제31권6호
• /
• pp.479-490
• /
• 2022

This study was to evaluate the utilization of terrestrial light detection and ranging for forest inventory in coniferous forests. Heights and diameter of the stand trees were measured manually using the traditional measurement method and the method using terrestrial LiDAR. The results of two methods were compared and analyzed to evaluate accuracy and feasibility. The terrestrial LiDAR used fixed and handy types to compare the accuracy between different operational methods. Comparative analyses used a paired t-test and Bland-Altman plot analysis. In the case of tree heights, the average of difference between the traditional method and terrestrial LiDAR for each plot was 0.81 m, -0.07 m, and 0.13 m for fixed type; 2.88 m, 1.19 m, and 0.93 m for the handy type. In the case of tree diameter at breast height, the average value of the difference between traditional methods and terrestrial LiDAR for each plot was 0.13 cm, -0.66 cm, and -0.03 cm for fixed type; 2.36 cm, 2.13 cm, and 1.92 cm for the handy type. The values from the method using the fixed type was highly consistent with that using the traditional measurement methods; the average difference was closer to zero. The crown density influences the precision of the height measurement using terrestrial LiDAR in coniferous forests. Therefore, future studies should focus on verifying the accuracy of terrestrial LiDAR in forests and on expanding the utilization of terrestrial LiDARs according to their operational methods.