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RISS 인기검색어
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- 저자 : 김정창(Jeng Chang Kim) (검색결과 3 건)
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동해 전선역 동물플랑크톤 군집 : 2 . 수온과 분포의 관계
박철(Chul Park),이창래(Chang Rae Lee),김정창(Jeng Chang Kim) 한국수산과학회 1998 한국수산과학회지 Vol.31 No.5
Distribution of zooplankton abundance was studied in the front zone in the East Sea in November, 1996. Averaged total abundance in the front zone was less than that in the nearby cold surface water areas but more than that in the nearby warm surface water areas. The number of taxa was the greatest in the upper layer of mixing. Abundance and the number of taxa in the front zone were contributed by the cold water and the warm wster, respectively. Inspite of the differences in sampling time (day vs night), the species composition and abundance distribution were similar at two sites within cold or warm water area. However, they were quite different at two sites in the front zone altnough the sampling time of the day was the same. From this, the history of mixing was believed to be the most important factor for the species composition and abundance distribution in the front zone. Zooplankton distribution in the study area was mainly controlled by the dominant cold water Copepod species Metridia pacifica, the only taxon that showed significant diel vertical migration. Most other taxa showed no significant diel vertical migration. Seawater temperature also affected zooplankton distribution. Positive correlations in the warm area, weak negative correlations in the cold water area, and no significant correlation in the front zone were obtained in general between the seawater temperature and the abundances of the major taxa.
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김대철,김길영,서영교,하덕호,하인철,윤영석,김정창,Kim, Dae-Choul,Kim, Gil-Young,Seo, Young-Kyo,Ha, Deock-Ho,Ha, In-Chul,Yoon, Young-Seok,Kim, Jeng-Chang 한국해양학회 1999 바다 Vol.4 No.4
The conventional mercury delay method to measure compressional wave velocity of unconsolidated sediment is inconvenient because the signal must be analyzed on the oscilloscope and the mercury column has to be calibrated between measurements. We developed an automated compressional wave velocity measurement technique by connecting an oscilloscope and a PC with a GPIB (General Purpose Interface Bus) card. The GPIB card buses signals from the oscilloscope to the PC where the signal from a sample is analyzed and compared to the input pulse thereby the compressional wave velocity of the sample is computed and recorded automatically. Differences between the mercury delay method and the automated measurement technique are negligible except the slightly greater velocity in the automated measurement technique. We concluded that the new technique can be used to measure the velocity for unconsolidated marine sediment. It also has an advantage to calculate sediment attenuation through the processing of waveform using the spectral ratio technique. 퇴적물 음파전달속도 측정은 전통적으로 신호투과빙식을 이용한 수은기둥 방법을 응용하여 사용하여 왔다. 그러나 이 방법은 시료 및 표준물질을 통과한 신호를 오실로스코프상에서 자료처리를 할 수 없으며, 육안으로 펄스신호를 구분해야 하고, 측정자에 따라 속도값의 차이가 나타날 수 있고, 동일인이 측정할 경우에도 반복된 연습에 의한 숙련이 필요하다. 또한 수은기둥을 자주 보정해 주어야 하는 등의 단점이 있다. 이러한 문제를 해결하기 위해 퍼스널컴퓨터와 음파전달속도 측정장치인 오실로스코프 사이를 GPIB(General Purpose Interface Bus) 카드를 이용하여 연결한 다음 컴퓨터상에서 커서를 움직여 퇴적물의 음파전달속도를 측정하는 새로운 측정기법을 개발하였다. 새로운 측정방법의 검증을 위해서 동일시료에 대해 기존 수은기둥 방법과 병행하여 측정한 결과 측정 오차를 넘지 않는 거의 유사한 값을 보였다. 따라서 새로운 측정기법은 해양퇴적불의 속도측정에 이용될 수 있게 되었으며 입력된 양질의 파형을 이용하여 신호처리(FFT)를 함으로서 장래에 다른 음향특성(감쇠)까지도 구할 수 있는 장점을 갖게 되었다.
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남해 Sand ridge 퇴적물의 퇴적상과 물리적 특성
천희정(Hee Jeong Chon),서영교(Yong Kyo Seo),김대철(Dae Choul Kim),김정창(Jeng Chang Kim),(Jock Keene) 한국수산과학회 1998 한국수산과학회지 Vol.31 No.5
Sand ridges in the South Sea of Korea have been investigated to reveal the surface morphology and vortical variation in sediment physical property, Both field and laboratory methods such as high resolution subbottom profiling, side scan sonar, and physical property and sediment textural study on cored sediments were employed. Asymmetric sand waves are fecund on the ridge. No prominent difference in the sediment was recorded throughout the ridge area. Sediment sorting is generally poor due to interbedded mud. Average compressional wave velocity is 1753 m/sec for the sand dominated core section. Most of cores show two prominent facies : facies A and B. Facies A is defined as modern mud sediment and B is dominated by relict sand. Facies B is characterized by gravel, sand, and shell fragment. It is suggester that the Facies B was developed in transgressive environment by tide and sporadic high energy events.
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