• KOREAN POULTRY JOURNAL
• /
• v.36 no.12 s.422
• /
• pp.82-86
• /
• 2004

고병원성조류인플루엔자는 2003년 12월 10일 충북 음성군에서 최초 발생한 이후 2004년 3월 20일 경기 양주시를 마지막으로 총 19건이 발생되었으며, 지난 5월 29일 경남 양산지역을 마지막으로 이동제한이 전국적으로 해제되었다. 정부에서는 2004년 9월 21일부로 국제수역사무국(OIE)에 국내종식상황을 통보하였고 이에 일본에서는 국내산 가금육의 수입중단조치를 10월 13일에 해제하기에 이르렀다. 그러나 6월 16일 인도네시아를 기점으로 베트남(6.29), 태국(7.6), 중국(7.6) 등 총 15개에서 재발$\cdot$확산되고 있으며, 태국에서는 이종간의 전파로 호랑이가 30여마리가 조류인플루엔자로 폐사하고 유사증상을 보이는 호랑이 30마리를 살처분하기(10월 21일)에 이르렀다.

• Journal of the Korean Geographical Society
• /
• v.47 no.5
• /
• pp.641-653
• /
• 2012

We analyzed two radiocarbon-dated lagoonal sediment cores from Cheonjinho and Ssangho using various biogeochemical methods. As a result, the start times of rice agriculture are estimated to be AD 780 for Cheonjinho and 100 BC for Ssangho. There is a large temporal difference in the beginning of rice agriculture between two study sites even though they are closely located on the coast. This result indicates that pollen records are not sufficient to approximate the start time of rice agriculture accurately. A temporal lag seems to exist between the time when rice agriculture was first introduced and the time when full-scale rice agriculture began in the Yeongdong region, probably because of low agricultural productivity. In both study sites, rice agriculture intensified and slope erosion increased 250 years after full-scale agriculture began. This suggests that intensified rice agriculture resulted in an increased number of inhabitants, settlement expansion to hilly areas, and the consequent deforestation.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
• /
• v.5 no.1
• /
• pp.40-50
• /
• 1994

Through the low orbit GPS satellite a 3-dimensional real time position detection can be achieved anywhere. Utilizing the GPS satellite detection values an analysis of the varing characteristics of the iono- sphere can be achicved, and by calculating the correlation relationship of the position detection error and the ionospheric time delay characteristics, an advanced algorithm technique can be developed. Computer simulation of the developed algorithm for defining the correlation between the position detec- tion error and the varing ionospheric time delay characteristics has been proceeded. The results of simulation reveal the fact that the varing characteristics of the ionosphere nearly match the actual ionospheric time delay characteristics.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.23 no.8
• /
• pp.1952-1962
• /
• 1998

Radio interference ahs been occurred in TRS service on the south seashore in Korea from 1994. After monitoring the radio signal interference, it is found that the main reasons of radio interference are due to the source stations located at Fukuoka and Yamaguchi in Japan. However, Japan didn't agree about this fact, based on the their technique evaluationof the radio signal; since the distance (about 240-300km) of the radio station between Fukuoka and Pusan is enough to separate from the interference, the radio signal from Digital Mobile Phone is Japan cannot be reached to Pusan area in Korea. In this paper, we verified that the main sources of radio interference are a ducting propagation generated from Japan area by using the computer simulation technique and the measuring data.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.19 no.3
• /
• pp.83-93
• /
• 2009

In recent years, cyber crimes were intended to get financial benefits through malicious attempts such as DDoS attacks, stealing financial information and spamming. Botnets, a network composed of large pool of infected hosts, lead such malicious attacks. The botnets have adopted several evasion techniques and variations. Therefore, it is difficult to detect and eliminate them. Current botnet solutions use a signature based detection mechanism. Furthermore, the solutions cannot cover broad areas enough to detect world-wide botnets. In this study, we suggest an architecture to detect and regulate botnets using cooperative design which includes modules of gathering network traffics and sharing botnet information between ISPs or nations. Proposed architecture is effective to reveal evasive and world-wide botnets, because it does not depend on specific systems or hardwares, and has broadband cooperative framework.

• Journal of Satellite, Information and Communications
• /
• v.12 no.4
• /
• pp.62-66
• /
• 2017

In this paper, we present the development of communication and data processing strategy for the electromagnetic wave precipitation gauge system. The electromagnetic wave precipitation gauge system is a small system for deriving area rainfall rates within 1 km radius through dual polarization radar observation at 24GHz band. It is necessary to take consider for measurement of accurate precipitation under limited computing resources originating from small systems and to minimize the use of network for the unattended operation and remote management. To overcome computational resource limitations, we adopted the fuzzy logic for quality control to eliminate non-precipitation echoes and developed the method by weighted synthesis of various rain rate fields using multiple radar QPE formulas. Also we have designed variable data packets rules to minimize the network traffic.

• Journal of Korea Spatial Information System Society
• /
• v.10 no.1
• /
• pp.51-63
• /
• 2008

Previous studies for routing In USN (Ubiquitous Sensor Networks) appear to be unreliable due to the dependence on non-spatial data and the lack of map overlay analysis. Multiple spatial parameters and radio propagation modeling techniques were integrated to derive RSSI (Received Signal Strength Indicator) value between route nodes and produce a highly reliable path map. It was possible to identify area-wide patterns of USN route subject to many different Influences (e.g. the specific effects of radio blocking factors such as the visible area, road area, cell duplicated area, and building density), which cannot be acquired by traditional non-spatial modeling. The quantitative evidence concerning the USN route for individual cell as well as entire study area would be utilized as major tools to visualize paths in real-time and to select alternative path when failure or audition of route node occurs.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.12 no.6
• /
• pp.241-249
• /
• 2012

In the many countries, research about ultra wideband wireless transmission technique is widely studied for efficient utilization of frequency resource due to a sudden increase of demand of frequency resource all over the world. The ultra wideband communication system has the some specific advantages. First, it can transmit data with high speed, second short transmission range can increase the frequency reuse rate, and finally it has high security property. However, there is a interference between ultra wideband system and other communication system but study to solve this problem is insufficient. To efficient utilization of limited frequency resource, a novel frequency avoidance technique and setup the standardization of frequency interference must need. So, the purpose of this paper is that increases communication efficiency of microwave communication systems to analyze the technical trends for transmission of the low power device, and to research the implementation and technical research of wireless access network technique of wideband communication systems.

• Journal of agricultural medicine and community health
• /
• v.27 no.2
• /
• pp.67-73
• /
• 2002

집쥐가 인체 기생충 전파에 어느 정도의 역할을 하는지 그 양상을 밝히고자 전라북도 남원, 익산지역에서 포획한 집쥐의 체내 기생충 감염상을 조사하였다. 섬진강 상류 남원지역에서 32마리, 만경강 중류 익산지역에서 53마리를 채집하여 총 85마리였고, 종별로는 곰쥐(Rattus rattus) 28마리, 시궁쥐(Rattus norvegicus) 57마리였다. 결과를 요약하면 다음과 같다. 1. 남원, 익산지역의 집쥐 85마리 중 71마리(83.5%)에서 체내 기생충이 검출되었다. 2. 폐장이 회수되었던 집쥐 74마리 중 35마리(47.3%)에서 폐장에 기생하는 조직 기생충인 폐포자충(Pneumocystis carinii)이 검출되었다. 3. 전체 85마리의 가로막에서 선모충(Trichinella spiralis)을 조사하였고, 폐심장 혈관계에서 광동주혈선충(Angiostrongylus cantonensis)을 조사하였으나 한 예도 검출하지 못하였다. 4. 간을 조사한 바 85마리 중 간모세선충(Capillaria hepatica) 22례(25.9%), Taenia taeniaeformis의 유충(Cysticercus fasciolaris) 9례(10.6%), 간흡충(Clonorchis sinensis) 1례(1.2%)가 검출되었다. 5. 장내용물을 조사 한 바 85 마리 중 50례(58.9%)에서 윤충 및 원충이 검출되었다. 윤충은 쥐조충(Hymenolepis diminuta), 극구흡충류(Echinostoma sp.), 쥐요충류(Syphacia sp.), 분신충류(Strongyloides sp.) 등이었고 원충은 대장아메바(Entamoeba coli) 등이었다. 이상의 결과에서 인수공통 질환을 일으킬 수 있는 폐포자충, 쥐조충, 간흡충 등이 집쥐에 감염되어 있어 철저한 집쥐 관리가 요망된다.

• Journal of Satellite, Information and Communications
• /
• v.8 no.4
• /
• pp.135-141
• /
• 2013

Subway in Korea, most of a metropolitan public transport use only worth ten million people a day floating population of wireless communication can be considered HOT SOPT. These three operators' 2G/3G/4G / Wi-Fi / T-DMB frequency and the number of services to co-exist, and the subway train passengers and subway party for operation and management of the communication network is also the co-subway passenger safety and for this service for the effects of mutual interference of whether the verification was necessary. This research and testing different frequency / communication interference between services and testing to determine whether, through the subway authorities and mobile operators in each frequency-specific interaction check and there is no interference to the safety and quality of subway passengers communication services that can be verified as the data was found. The verification methods in the metro area, not just from one region to determine whether the interference with a common verification methods can be applied.