• 한국농공학회논문집
• /
• 제59권3호
• /
• pp.29-39
• /
• 2017

In this study, the GPM (Global Precipitation Mission) IMERG (Integrated Multi-satellitE retrievals for GPM) rainfall data was verified and evaluated using ground AWS (Automated Weather Station) and radar in order to investigate the availability of GPM IMERG rainfall data. The SPI (Standardized Precipitation Index) was calculated based on the GPM IMERG data and also compared with the results obtained from the ground observation data for the Hoengseong Dam and Yongdam Dam areas. For the radar data, 1.5 km CAPPI rainfall data with a resolution of 10 km and 30 minutes was generated by applying the Z-R relationship ($Z=200R^{1.6}$) and used for accuracy verification. In order to calculate the SPI, PERSIANN_CDR and TRMM 3B42 were used for the period prior to the GPM IMERG data availability range. As a result of latency verification, it was confirmed that the performance is relatively higher than that of the early run mode in the late run mode. The GPM IMERG rainfall data has a high accuracy for 20 mm/h or more rainfall as a result of the comparison with the ground rainfall data. The analysis of the time scale of the SPI based on GPM IMERG and changes in normal annual precipitation adequately showed the effect of short term rainfall cases on local drought relief. In addition, the correlation coefficient and the determination coefficient were 0.83, 0.914, 0.689 and 0.835, respectively, between the SPI based GPM IMERG and the ground observation data. Therefore, it can be used as a predictive factor through the time series prediction model. We confirmed the hydrological utilization and the possibility of real time drought monitoring using SPI based on GPM IMERG rainfall, even though results presented in this study were limited to some rainfall cases.

• 한국컴퓨터정보학회논문지
• /
• 제20권6호
• /
• pp.87-97
• /
• 2015

항공 영상 요약은 무인항공기를 통해 획득된 전체 영상의 내용을 제한된 시간 내에 효과적으로 브라우징 함으로써 감시 정찰 지역에 대한 상황 인식을 가능하게 하는 기술이다. 항공 영상의 정확한 요약을 수행하기 위해 본 논문에서는 센서 운용 모드를 집중감시, 전역감시 그리고 구역감시모드로 구분하고 해당 센서 운용 모드의 특성을 고려하여 항공 영상 요약을 수행한다. 특히 집중감시 모드에서의 영상 요약은 화면 내 움직임이 있는 관심 객체의 지속적인 추적을 기반으로 수행되며 이를 위해 본 논문에서는 지역 움직임 벡터(partitioning motion vector)와 해당 벡터가 발생한 영역에서의 시공간적 중요도 지도(spatiotemporal saliency map)를 활용한 움직임 반응 추적 기법을 제안한다. 제안하는 알고리즘의 효율성과 적합성을 확인하기 위해 실 항공 영상을 대상으로 실험을 수행하였다. 도출된 실험 결과를 통해 제안하는 방법은 전체 항공 영상에서의 영상 요약을 위해 센서 운용 모드에 따라 정확한 대표 프레임을 검출하였으며 이에 따라 대용량의 무인항공기 획득 영상이 효과적으로 요약될 수 있음을 확인하였다.

• 수산해양교육연구
• /
• 제24권6호
• /
• pp.901-919
• /
• 2012

The purpose of this study is to conceptualize some issues around university restructuring in Korea, and explore rational-practical solutions ensuring the survival of higher education institutes confronting many challenges like rapid decreasing rate of birth, global open market of higher education system, and the phenomena of concentration on capital city area etc.. In order to achieve study goals, higher education policies and provisions of past governments from DaeJung Kim's to current MeongBak Lee's were analyzed, and also characteristics and directions of university restructuring of each government were identified. Through this analysis, it was evident that the main concern of university restucturing discourse was primarily focused on how to make public universities have high level of competitiveness. On the other hand, private universities had been totally alienated from university restructuring discourse since 1990's, despite their historical and great contributions to national development of our country. Based on some criticisms of educational policies of national government and partial revision proposal of the higher education act initiated by a few assemblymen, this study suggested eight solutions for developmental restructuring of private universities; constructing comprehensive framework of university restructuring, keeping market-friendly restructuring principle to allow universities take an autonomous position, revising methods, criteria and indexes of university evaluation, reducing the number of enrolling students, not the number of universities and colleges, a new policy to develop local universities allying with universities located at capital city area, differentiating private universities into two types of semi- or quasi-national university and complete autonomous university, legislating financial supports to private universities, and lastly, equal treatment of public and private universities in pursuit of half price tuition.

• 통상정보연구
• /
• 제17권1호
• /
• pp.265-285
• /
• 2015

다자간 무역기구인 WTO는 전통적 교역 분야 이외에 회원국의 국내 정책까지 관여하여 지역 정부의 역할과 자주성을 위협함에 따라 최근에는 양자간 FTA 체결이 증가하고 있다. 이와 같은 통상 환경 변화를 활용하기 위하여 한국과 중국은 FTA 체결을 위한 실질적인 합의에 도달하였다. 일반적으로 자동차 분야는 우리나라가 국제 경쟁력을 지닌 주력 산업으로 분류되어 한 중 FTA의 수혜 업종으로 기대되었으며, 실제로 분석 결과 한국의 자동차 산업이 중국에 비해 세계 시장에서 비교우위를 지닌 것으로 나타났다. 그러나 한 중 FTA 관세 철폐 계획에서 자동차는 양허 대상 품목에서 제외되어 우리가 기대했던 관세 철폐를 통한 한국산 자동차의 가격 경쟁력을 누릴 수 없게 되었다. 이에 따라 우리 자동차 업계는 중국의 비관세 장벽 철폐 등 투자 환경 개선을 통해 효율적인 대중국 투자 환경을 조성해야 하고 한 중 FTA상 자동차의 양허 편입에 대비하여 중국 내 세계 유수 자동차 업체의 대한국 수출 확대 가능성 방지를 위한 엄격한 원산지 규정안을 마련해야 한다. 또한 중국 내 브랜드 전략을 더욱 강화하며 친환경 차량 개발 지원을 통해 중국의 환경 정책에 부응하면서 관련 시장을 창출 확대해야 한다.

• 한국전문물리치료학회지
• /
• 제27권1호
• /
• pp.87-92
• /
• 2020

Background: Bridging exercises are used to enhance the functional stability of the lumbopelvic region in clinical settings. Although most of the studies on bridging exercises have compared the complete activation of the trunk muscles, some recent studies have examined the functional stability of the trunk and the lumbopelvic region and assessed the appropriate recruitment of the local and global muscles during different task levels. Objects: The purpose of this study was to investigate the changes in muscle thickness in the transverse abdominis (TrA), internal oblique (IO), and external oblique (EO) muscles during a common bridging exercise on an unstable surface and to determine whether these changes differ based on the surface used. Methods: Twenty-five healthy young adults (8 males, 17 females) were recruited. The subjects were randomly assigned to either the exercise progression with a sling bridge group or the ball bridging exercise progression group, each with three stages of increasing difficulty. Each position was measured three times with an ultrasonic diagnostic imaging system, and the mean values were recorded for analysis. Results: No significant differences were observed between the TrA, IO, or EO muscle thickness ratios between the sling and ball exercise groups (p > 0.05). There were also no significant differences in the EO muscle thickness ratios between the tasks irrespective of whether the sling or ball was used. However, the TrA and IO thickness ratios in both groups were significantly greater during stages 2 and 3 compared to stage 1. Conclusion: The results suggest that the use of slings and balls during bridging exercises is effective in activating the deep abdominal muscles.

• 한국초등과학교육학회지:초등과학교육
• /
• 제26권5호
• /
• pp.580-595
• /
• 2007

To respond to the announcement of the revised version of science curriculum early this year, it has been necessary to develop new science textbooks which can be appropriate and effective to achieve the goals of the revised curriculum. The system of new textbooks needs to embrace the concerns of cognitive development in scientific knowledge, skills, and attitudes as well as social and cultural demands in the rapidly changing society. To develop an innovative framework of science textbooks, we examined previous studies on textbook analysis in Korea and analyzed science textbooks in the United States, Singapore, and Japan. We analyzed various ways of introducing and developing conceptual knowledge, leading scientific inquiry skills and process, enhancing scientific attitudes toward science, technology, society and the environment in those science textbooks. In the process of framing the structures of textbooks, we focused on ways of increasing educational effects of visualized texts, leaners' interest, user-friendly procedure, scientific inquiry, effectiveness of hands-on activities, scientific reading and writing skills, and usage of workbook. Based on those aspects and analyses of textbooks, we attempted to propose a feasible framework of Grade $3{\sim}4$ Science textbook which can effectively respond to the educational changes and demands in the local and global society.

• Journal of Positioning, Navigation, and Timing
• /
• 제5권1호
• /
• pp.11-20
• /
• 2016

In this paper, a system that can collect GPS L1 C/A, GLONASS G1, and BDS B1I signals with single front-end receiver was implemented using a universal software radio peripheral (USRP) and its performance was verified. To acquire the global navigation satellite system signals, hardware was configured using USRP, antenna, external low-noise amplifier, and external oscillator. In addition, a value of optimum local oscillator frequency was selected to sample signals from three systems with L1-band with a low sampling rate as much as possible. The comparison result of C/N0 between the signal collection system using the proposed method and commercial receiver using double front-end showed that the proposed system had 0.7 ~ 0.8dB higher than that of commercial receiver for GPS L1 C/A signals and 1 ~ 2 dB lower than that of commercial receiver for GLONASS G1 and BDS B1I. Through the above results, it was verified that signals collected using the three systems with a single USRP had no significant error with that of commercial receiver. In the future, it is expected that the proposed system will be combined with software-defined radio (SDR) and advanced to a receiver that has a re-configuration channel.

• 대한전자공학회논문지SD
• /
• 제37권5호
• /
• pp.77-87
• /
• 2000

지금까지 제시된 채널 라우팅 알고리즘의 복잡도는 공정기술의 발전에 따라 많은 어려운 부분이 해결되었지만 아직도 기존의 라우팅 알고리즘 수준에 머물러 있었다. 본 논문에서는 이러한 추세에 따라 개선된 3-레이어 OTC(Over-The-Cell) 채널 라우팅 알고리즘을 제시한다. 제안한 알고리즘은 채널 라우팅 문제를 일반적인 문제로 단순화시켜, 최적에 가까운 해에 수렴하기 위해서 시뮬레이티드 어닐링 기법을 이용한다. 그리고, 채널 라우팅에서 있어서 가장 어려운 요소로 알려진 cyclic vortical constraint를 제거하기 위한 방안을 제시하고, 알고리즘의 수행중 지역 해에 빠졌음을 감지하여 탈출을 보장하는 방안을 제시한다. 또한, 유전자 알고리즘을 이용하여 구현된 채널 라우터와 비교한다. 제안한 채널 라우팅 알고리즘은 리눅스 시스템에서 C++과 모티프를 이용하여 구현되었으며, 예제 회로에 적용하여 성능을 비교함으로써 제시한 알고리즘의 효율성을 찾을 수 있었다.

• 한국해양환경ㆍ에너지학회지
• /
• 제10권4호
• /
• pp.211-217
• /
• 2007

새로운 공격 무기들의 등장과 적과의 전투환경 변화로 현대의 함정설계에 있어 생존성의 향상은 가장 중요한 요소가 되었으며, 특히 적에게 쉽게 노출되는 수상함에 있어서는 생존성의 취약성에 대비한 감소대책이 보다 강조되고 있다. 생존성을 고려한 함정설계를 위하여 우선 적절한 공격 시나리오를 설정하고 이에 따라 폭발해석을 수행하여야 한다. 폭발은 함의 국부 손상 및 대변형 손상을 야기시키며 이 때 손상된 함정에 대한 적절한 생존성 평가가 중요하다. 본 연구에서는 구조-유체 연성기법 중 하나인 ALE기법을 적용하여 폭발해석을 수행하고 함정의 붕괴거동을 조사하였으며 이 손상된 함정에 대하여 정량적으로 생존시간을 계산할 수 있는 간략계산법을 제시하였다.

• 대한원격탐사학회지
• /
• 제32권1호
• /
• pp.1-11
• /
• 2016

Since forest is an important part of ecological system, the deforestation is one of global substantive issues. It is generally accepted that the climate change is related to the deforestation. The issue is worse in developing countries because the forest is one of important natural resources. In the case of North Korea, the deforestation is on the rise from forest reclamation for firewood collection and food production. Moreover, a secondary effect from flood intensifies the damage. Also, the political situation in North Korea presents difficulty to have in-situ measurements. It means that the accurate information of North Korea is nearly impossible to obtain. Thus, assessing the current situation of the forest in North Korea by indirect method is required. The objective of this study is to monitor the forest status of North Korea using multitemporal Landsat images, from 1980s to 2010s. Since the deforestation in North Korea is caused by local residents, we selected two study areas of high population density: Pyeongyang and Hyesan. In North Korea, most of clean Landsat images are acquired in fall season. The fall images have an advantage that we can easily distinguish agriculture areas from forest areas, also have an disadvantage that the forests cannot be easily identified because some of trees have turned red. To identify the forests exactly, we proposed a modified Normalized Difference Vegetation Index (mNDVI) value. The deforestation in Pyeongyang and Hyesan was analyzed by using mNDVI. The dimension of forest has decreased approximately 36% in Pyeongyang for 27 years and approximately 25% in Hyesan for 16 years. The results show that the forest areas in Pyeongyang and Hyesan have been steadily reduced.