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박영글 ( Yeong Guel Park ),서영일 ( Young Il Seo ),오택윤 ( Taeg Yun Oh ),박준성 ( Jun Seong Park ),장충식 ( Choong Sik Jang ),강명희 ( Myoung Hee Kang ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.2
The multi-frequency characteristics of anchovy schools were investigated using six acoustic lines collected at 38 and 120 kHz while a primary trawl survey was conducted from 14 April and 18 April of 2014 in off the coast of Tongyeong and Geo.je. Here, the frequency characteristics mean ΔMVBS that is the difference of Mean Volume Backscattering Strength at two frequencies. To use the characteristics effectively, the optimal cell size (10×2 m) was determined by examining several different cell sizes in consideration with the shapes of fish schools and the ΔMVBS pattern. By examining 6 histograms of ΔMVBS, afternoon groups were occupied more in the ΔMVBS range of .6~.4 dB than that of .4~.2 dB, comparing tomorning groups. The ΔMVBS range of the morning groups was between .16.9 dB and 11.6 dB, and that of the afternoon groups .16.7 dB and 13.0 dB. The average and standard deviation were .3.9±3.6 dB in the morning and .4.1±3.4 dB in the afternoon, suggesting that morning groups were 2 dB higher than afternoon groups. The ΔMVBS range of all anchovy schools regardless of morning and afternoon was between .16.9 dB and 13.0 dB, their average ΔMVBS was .4.1±3.5 dB. The characteristics can support to identify anchovy species in the waters where multiple fish species are distributed. It is hoped that this study presents the availability and benefit of acoustic data from a primary trawl survey.
플로우 전달 특성 기반의 P2P 헤비 트래픽 검출 알고리즘
최병걸(Byeong-Geol Choi),이시영(Si-Young Lee),서영일(Yeong-il Seo),위즈빈(Zhibin Yu),전재현(Jae-Hyun Jun),김승호(Sung-ho Kim) 한국정보과학회 2010 정보과학회논문지 : 정보통신 Vol.37 No.5
최근 분산 컴퓨팅 환경이 확대되고 네트워크 기반의 응용프로그램이 다양하게 개발됨에 따라 네트워크 트래픽이 증가되고 있으며, 트래픽 종류도 P2P(Peer to Peer), 실시간 동영상등과 같이 다양해지고 있다. 네트워크 트래픽 중에서 P2P 트래픽이 지속적으로 증가되면서 많은 대역폭을 차지하고 있기 때문에 웹, 파일 전송 및 실시간 동영상등과 같은 다른 네트워크 응용프로그램의 서비스 품질을 보장하지 못하는 상황이 빈번하게 발생하고 있다. P2P 트래픽으로 인한 문제점을 해결하기 위해 기존에 포트 기반의 P2P 트래픽 검출 기법과 패킷들의 내용를 검사하는 DPI(Deep Packet Inspection) 방식의 검출 기법들이 제시되었으나 최근의 P2P 응용프로그램들이 고정된 포트를 사용하지 않으며, 패킷들의 내용을 암호화하여 전송함으로써 기존의 연구 방법을 P2P 트래픽 검출에 적용하기가 어려운 상황이다. 본 논문에서는 기존의 포트 기반의 P2P 트래픽 검출 기법과 DPI 기법의 문제점들을 해결할 수 있는 플로우(flow) 매개변수의 상관 관계를 이용한 플로우 전달 특성 기반의 P2P Heavy 트래픽 검출 알고리즘을 제시한다. 본 논문에서 제시하는 알고리즘은 P2P 트래픽 중에서 네트워크 대역폭을 가장 많이 차지하는 컨텐츠 다운로드 P2P 트래픽을 검출하는 것이다. P2P 트래픽은 컨텐츠를 가지고 있는 상대 노드(Peer)들을 검색하는 단계와 검색된 노드들 중에 하나 이상의 노드로부터 컨텐츠를 다운로드하는 단계로 이루어진다. 이러한 P2P 응용프로그램들의 특성을 P2P 플로우 패턴으로 정의하고 이를 기반으로 P2P Heavy 트래픽을 검출하는 알고리즘을 개발하였다. Nowadays, transmission bandwidth for network traffic is increasing and the type is varied such as peer-to-peer (P2P), real-time video, and so on, because distributed computing environment is spread and various network-based applications are developed. However, as P2P traffic occupies much volume among Internet backbone traffics, transmission bandwidth and quality of service(QoS) of other network applications such as web, ftp, and real-time video cannot be guaranteed. In previous research, the port-based technique which checks well-known port number and the Deep Packet Inspection(DPI) technique which checks the payload of packets were suggested for solving the problem of the P2P traffics, however there were difficulties to apply those methods to detection of P2P traffics because P2P applications are not used well-known port number and payload of packets may be encrypted. A proposed algorithm for identifying P2P heavy traffics based on flow transport parameters and behavioral characteristics can solve the problem of the port-based technique and the DPI technique. The focus of this paper is to identify P2P heavy traffic flows rather than all P2P traffics. P2P traffics are consist of two steps i)searching the opposite peer which have some contents ii) downloading the contents from one or more peers. We define P2P flow patterns on these P2P applications’ features and then implement the system to classify P2P heavy traffics.
새우조망을 이용한 금강 하구역 어획물의 계절별 종조성 및 군집분석
이선길 ( Sun Kil Lee ),최문성 ( Moon Seong Choi ),서영일 ( Yeong Il Seo ),이재봉 ( Jae Bong Lee ) 한국어업기술학회 2014 수산해양기술연구 Vol.50 No.4
Seasonal variations in species composition of catches were explored using seasonal samples caught by shrimp beam trawl in the Geum river estuary in 2011. During the study period, total catches were collected 91 species as fish 47 species, crustacean 28 species, mollusca 4 species, gastropoda 5 species, shellfish 3 species and others 4 species. The dominant species were Exopalaemon carinicauda, Eriocheir leptognathus, Palaemon gravieri, Mugil cephalus, Acanthogobius hasta, Cynoglossus joyneri, Pennahia argentata and Coilia nasus. The amount of species in spring and summer was higher than in autumn. The diversity index (H``) was 0.43~0.96, evenness index (EI) was 0.14~0.25, and richness index (RI) was 1.54~4.25. Using cluster analysis 91 species were divided into 4 groups. Group I appeared mainly in spring and summer. Group II appeared only in summer. Group III appeared in winter and spring, and Group IV in spring and autumn.
함상수 ( Ham Sang Su ),김욱 ( Kim Ug ),박신성 ( Park Sin Seong ),서영일 ( Seo Yeong Il ),임성희 ( Im Seong Hui ),김병태 ( Kim Byeong Tae ),최문기 ( Choe Mun Gi ),장연복 ( Jang Yeon Bog ),유형준 ( Yu Hyeong Jun ),박성우 ( Park Seo 대한내과학회 1993 대한내과학회지 Vol.44 No.5
Backgrounds: To characterize tha IDDM in Korea, we analyzed the epidemiological and clinical features of DKA in 72 patients. Methods: Seventy-two cases thoses who met following diagnostic criteria were included in the analysis. 1) Clinical manifestation of typical DKA, 2)Blood glucise level>250 mg/dl, 3) Presence of ketonuria or keonemia, 4) Blood pH<7.34 Results: 1) The occurrence of DKA was higher in the young and infemale. 2) DKA occurred most frequently in colder season with apparent two peaks in March and December. 3) In 23.6%, DKA was the first clinical presentation of diabetes and in the remainders, diabetes wer known to be present for average of 5.4 years. 4) The most common precipitating factors of DKA was infection and omission of therapy was the next. No discernible precipitating factor was found in 26.4% of DKA cases. 5) Polyuria, polydipsia, dyspnea, nausea, vomiting and abdominal pain were frequent accompanying symptoms, and physical finding included Kussmaul breathing, tachycardia and hypotension. The mental stutus of patients were alert in 55.6% of DKA cases. 6) There was no significant difference in the body temperature, PB smear, and % of neutrophis between DKA cases with infection and those without infection. 7) On admission potassium was high in 43%, but low in 23% 6 hours after therapy. In only two-thirds of cases, fasting C-peptide level on admission was decreased in the range of classical IDDM. 8) Hypoglycemia was the most freqeunt complication during the treatment of DKA following by hypokalemia, hypernatremia, hyperkalemia, thromboembolism and ARDS. 9) Mortality of DKA was 13.9% and poor prognostic factors include old age, azotemia, associated bacterial pneumonia. Conclusions: The epidemiological and clinical feautures of DKA in Korea were similar to those in western countries, in respect to female preponderance, age, seasonal distribution, % of debut cases, precipitating fators, initial laboratory findings, complications, mortality and prognostic factors. This observation suggests that although the incidence rate of IDDM is low in Korea, there are cases that take clinical courses very similar to those of western countries.