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An Implementation of Acoustic-based MAC Protocol Multichannel Underwater Communication Network
Lim, Yong-Kon,Park, Jong-Won,Kim, Chun-Suk,Lee, Young-Chul The Korea Institute of Information and Commucation 1997 한국정보통신학회논문지 Vol.1 No.1
This Paper Proposes a new efficient system design strategies for the acoustic-based underwater multiple modem and media access control protocol. The system aims to establish the acoustic-based communication network of an underwater vehicles for deep sea mining, which ensures a certain level of maximum throughput regardless of the propagation delay of acoustic and allows fast data transmission through the acoustic-based multiple channel. A media access control protocol for integrated communication network and it's acoustic-based communication modems that allows 'peer-to-peer' communication between a surface mining plant multiple underwater system is designed, and the proposed media access control protocol is implemented for its verification. Furthermore, a proposed design strategies which make it possible to control the multiple vehicle for an underwater mining is presented in this paper.
임영석(Young Seok Lim),류지곤(Ji Kon Ryu),이한주(Han Chu Lee),김용태(Yong Tae Kim),윤용범(Yong Bum Yoon),김정룡(Chung Yong Kim) 대한소화기학회 1997 대한소화기학회지 Vol.29 No.5
N/A Background/Aims: About ten to twenty percent of patients with acute pancreatitis progress to pancreatic necrosis. Little is known about the etiology of necrotizing pancreatitis. It has been suggested that even in the necrotizing pancreatitis group, the prognosis of patients vary greatly according to the degree of necrosis of the pancreas. Methods: We investigated retrospectively the etiology and predictive value of four prognostic indicators (Ransons criteria, APACHE-II score, analysis of peritoneal fluid, CT severity index) in fourteen patients with necrotizing pancreatitis who were admitted to Seoul National University Hospital from Jan. 1987 to Jun. 19!)5. Results: The most common cause was alcohol(9 patients), and no case was associated with cholelithiasis. Of the fourteen patients, five died, and three had more than 3 major complications. In contrast, another six patients had less than 2 complications. The sensitivity and specificity for prediction of serious prognosis (death or more than 3 major complications) of four prognostic indicators were all more than 70%, however, the CT severity index was most valuable. There were. Significant correlation between the CT severity index and Ransons criteria and analysis of peritoneal fluid. Conclusions: Alcohol seems to be the leading etiologic factor in necrotizing pancreatitis, and all prognostic indicators were effective for the prediction of serious prognosis. However, in the case of severe acute pancreatitis, the contrast enhanced dynamic CT(CECT) scan should be performed and proper management is necessary. (Korean J Gastroenterol 1997;29:667-677)
Low Temperature High k Dielectrics for Embedded Microcircuit Systems
Yong Soo Cho,Byeong Kon Kim,Won Bae Lim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.II
This work is intended to provide examples of low-temperature dielectrics applicable for embedded microcircuit systems, which can be characterized by different dielectric constants ($k$) of $k$ $\sim$ 8.2, $k$ $\sim$ 48.2 and $k$ $\sim$ 1337. The first two dielectrics contain crystallizable glasses as a major component, while the dielectric of $k$ $\sim$ 1337 is based on BaTiO$_3$ with a small proportion of uncrystallizable bismuth silicate glass. The physical and dielectric properties of the three dielectrics were evaluated, as excellent dielectric performance was demonstrated. Specifically, the shrinkage issue was addressed as an example in the case of hetero-lamination structures containing a higher-$k$ dielectric as an embedded capacitor. It was concluded that the overall dimensional changes depended on the firing behavior, {\it i.e.}, densification and crystallization, of the individual dielectric tape layer. Lower shrinkage of 2.4 to 5.4 \% was observed for the embedded laminate systems, which was unexpected from the shrinkage values (16.4 \% for the $k$ $\sim$ 8.2 dielectric and 14.1 \% for the $k$ $\sim$ 48.2 dielectric) of each constituent dielectric layer.
( Min Kon Kim ),( Sung Kyu Hong ),( Dae Ho Lim ),( Dong Jun Yoo ),( Yong Kang ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.4
Effects of operating variables on the solid circulation rate were investigated in a three-phase circulating fluidized bed, of which inside diameter was 0.102m and height was 3.5m, respectively. Gas velocity, primary and secondary liquid velocities, particle size and height of solid particles piled up in the solid recycle device were chosen as operating variables. The solid circulation rate increased with increasing primary and secondary liquid velocities and height of solid particles piled up in the solid recycle device, but decreased with increasing particle size. The value of solid circulation rate decreased only slightly with increasing gas velocity in the riser. The values of solid circulation rate were well correlated in terms of dimensionless groups within the experimental conditions.