• 한국환경과학회지
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• 제17권2호
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• pp.141-148
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• 2008

In order to investigate the effect of inflow of Yangze river on the distribution of chlorophyll-${\alpha}$, the results of serial oceanographic observation during 2000-2005 were used. The oceanographic conditions in the northern East China Sea is influenced by the Tsushima Warm Current and low saline water derived from the Yangze river. The distributions of these water masses vary significantly by the season in the northern East China Sea. The sea surface temperature and salinity were stable and concentrations of chlorophyll-${\alpha}$ were low in the eastern part of $126^{\circ}E$. On the contrary, the salinity was significantly influenced by the low saline water derived from Yangze river with the high concentrations of chlorophyll-${\alpha}$. It is suggested that the low saline water inflowed from the Yangze river affects high concentrations of chlorophyll-${\alpha}$ in the northern East China Sea in summer.

• Fisheries and Aquatic Sciences
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• 제11권1호
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• pp.50-60
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• 2008

Harmful algal blooms (HABs) of Cochlodinium polykrikoides frequently occur around the South Sea of Korea, causing. economic losses in coastal breeding grounds. HAB outbreak scale usually changes each year depending on physical, biological and environmental conditions. Relatively large-scale HABs occurred in 1995, 1997, 1999, 2001, 2002 and 2003 with respect to spatial scale, duration and maximum density. Considering HAB scale and temperature distributions around the South Sea, we found that low coastal temperatures in August correspond to enormous HAB outbreaks. Cold waters created by coastal upwellings around the southeastern coast of Korea also corresponded to these outbreaks. Serial oceanographic investigations in August in the South Sea revealed that sea surface temperature anomalies had distinctively negative values when large-scale HAB outbreaks appeared. With regard to temperature differences between the surface and the 30-m layer, there was a tendency for large-scale outbreaks when temperature gradients around the seasonal thermocline weakened.

• Fisheries and Aquatic Sciences
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• 제11권1호
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• pp.41-49
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• 2008

Internal waves and internal tides occur frequently along the eastern coast of Korea. During the spring-tide period in April 2003, the East Korean Warm Current (EKWC) flowed near the Korean East Coast Farming Forecast System (KECFFS; a moored oceanographic measurement system), creating a strong thermocline at the intermediate layer. Weakened stratification and well-mixed water appeared frequently around the KECFFS, with duration of approximately 1 day. The results suggest the following scenario. Baroclinic motion related to the internal tide generated high frequency internal waves around the thermocline. The breaking of those waves then created turbulence around the thermocline. After well-mixed water appeared, a current component with perpendicular direction to the EKWC appeared within the inertial period. The change in stratification around the KECFFS locally broke the geostrophic balance as a transient state. This local vertical mixing formed an ageostrophic current within the inertial period.

• 한국항행학회논문지
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• 제21권6호
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• pp.549-553
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• 2017

2014년에 착수된 한국형 SBAS인 KASS 개발 사업은 2022년 APV-1급 SOL서비스를 목표로 개발이 수행 중에 있다. KASS 연구개발에는 개발 요구조건 및 성능 요구조건을 분석하기 위해 비행시험이 이루어져야 한다. 그러나 국내에는 아직 평가항목이 제시되어 있지 않아 FAA 및 ICAO 규정서를 분석하여 KASS 개발을 위한 비행시험용 평가 항목이 구성되어야 하고, 국제적 기준에 부합하여 만들어져야 한다. 본 논문에서는 위성항행시스템을 적용한 비행시험용 SBAS 구간별 절차 검증을 분석한다.

• 한국게임학회 논문지
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• 제16권3호
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• pp.127-138
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• 2016

워치페이스는 현재 앱스토어에 개제된 스마트워치 콘텐츠 중 가장 많은 수를 차지하는 콘텐츠이다. 그러나 워치페이스 자체가 게임이 되는 콘텐츠는 거의 발견되지 않는다. 워치페이스와 연계하여 구동되는 게임은 조작의 최소화와 함께 게임에의 접근을 쉽게 하고 이를 통해 배터리 소모를 줄임으로써 궁극적으로 게임에의 몰입을 증가시킬 수 있을 것으로 기대된다. 본 연구는 웨어러블 디바이스에 대한 배경 연구를 시작으로 게임 콘텐츠 디자인, 제작까지 콘텐츠 개발의 전 과정을 통해 스마트워치 게임의 새로운 개발 방법론을 제시함으로써 스마트워치 게임 개발이 활성화되는데 역할을 할 것으로 기대한다.

• Journal of Ecology and Environment
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• 제29권1호
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• pp.1-16
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• 2006

Environmental variables, fishing and biological data of the common squid, Todarodes pacificus were used to describe changes in structure, migration and abundance of the squid population in relation to ocean climate shifts. It was possible to consider the main groups of the squid (autumn and winter-spawned groups) as a single population to aid conservation in the waters around Korea and Japan (TWC and KOC regions). The patterns of yearly fluctuations in abundance of the squid population in the two regions were the same during 52 years of $1952{\sim}2003$. The abundance of the squid began to decrease in both regions in the early 1970s, remained low in the 1980s and the main squid groups synchronously increased in the 1990s coincident with favorable changes of thermal conditions and plankton production in those ecosystems. The mechanisms of changes in the structure, distribution and abundance of common squid population in relation to current-mediated migration circuits are explained on the basis of phenological variables responding to climate shifts.

• 한국기계기술학회지
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• 제20권6호
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• pp.879-885
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• 2018

Precedent research and development of personal armor and anti-stab wearing system has been conducted since 2018 as a part of the government-affiliated cooperative development project to create the best utilization of present technology and achievement according to the civil and military technical cooperation project promotion law. At present, the armor system operated by the ROK(Republic of Korea) military, the police, and the marine police is utilizing only basic armor using armor vests and plates. Therefore it is necessary to develop the personal armor and anti-stab wearing system which is suitable for various tasks in army with maximum protection capability. In this paper, we analyzed the study about international technologies, market trends of the developed countries and scope of research, utilization plan, R&D results for the best armor and anti-stab wearing system development.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.109-114
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• 2008

본 논문에서는 기존의 모바일 증강 현실의 한계점을 간단히 설명하고, 이를 극복할 수 있는 대안으로 맥락인식(Context-aware) 모바일 증강 현실 프레임워크인 CAMAR (Context-Aware Mobile Augmented Reality) Core 플랫폼을 제안한다. 최근 모바일 장치의 기능 향상과 증강 현실과 관련된 기술의 발전으로 모바일 증강 현실에 관한 많은 연구들이 진행 중에 있다. 그러나 유비쿼터스 컴퓨팅 환경에서 모바일 증강 현실을 활용하기 위해서는 다양한 컨텍스트 활용, 사용자에 따른 개인화된 콘텐츠 증강, 그리고 여러 사용자가 공유할 수 있는 기능들이 제공되어야 한다. 따라서 제안된 CAMAR Core플랫폼은 이와 같은 기능들을 개발자들이 쉽게 활용하여 맥락인식 모바일 증강 현실 시스템을 구현할 수 있는 프레임워크를 제공한다. 제안된 프레임워크의 유용성을 보이기 위해서 제안된 프레임워크로 구현된 시스템을 소개한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.360-363
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• 2006

The red tide related with Cochlodinium Polykrikoides bloom has been frequently occurred around the South Sea of Korea and caused the economic loss in the coastal breeding grounds. The outbreak scale was usually change by physical, biological and environmental condition at each years. Relatively large-scale red tide occurred in 1995, 1997, 1999, 2001, 2002 and 2003 through spatial scale, duration and maximum density. Compared the scale of red tide with physical condition around the South Sea, the lower coastal temperature on August around the South Sea corresponded with the large scale red tide. By serial oceanographic investigations on August in the South Sea and estimated wide area temperature information by satellite, SSTA around the South Sea and wide area was negative when the outbreak of red tide was large scale. From the results of temperature difference between surface and 30m layers, the occurrence of enormous red tide has a tendency when the temperature gradient around the seasonal thermocline was weakened. Larger Kuroshio volume transport in the upstream was also corresponded with the large scale red tide.

• 제어로봇시스템학회논문지
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• 제5권6호
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• pp.753-763
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• 1999

The existing SCADA(Supervisory Control and Data Acquisition) system software is usually developed to suitable for the specific hardware platforms. However, as per rapid improvement of computer performance and development of network technology, it is required to support scalability and inter-operability in existing different SCADA systems. In order to meet such requirements, in this paper, we propose a new type of SCADA testbed using Java for electric distribution applications. The system consists of three modules; development support tools, client and server modules. The basic architecture of the proposed SCADA system is similar to existing one, however, we improve the function of MTU and MMI interface to facilitate LAN and WAN environment. Also, the proposed system can deals with alarm and history data by using heterogeneous DBMS. Since the system is built in Java environment, the development cost is cheap and it can support sacalability and portability. Our experience can be utilized to develop next generation of small and medium size of SCADA system.