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류재근 한국물환경학회 2004 한국물환경학회지 Vol.20 No.1
Water quality is monitored at 1,837 points which are streams and sources for water supply in Korea. The monitoring carry out the measurement of 16 parameters of pH, BOD, SS, DO and so on with once a month, and of other parameters such like heavy metal with once a quarter. But most of the monitoring is carried out uncontinuously, so it is very difficult to understand exactly the changes of water quality compared with continuous monitoring. Therefore, real time monitoring system was equipped with basic parameters such as pH, temperature, DO, turbidity and electric conductivity at 25 major sources of water supply after installation of Noryangjin and Dukdo in 1974. But the systems have some problems which cannot be considered the sampling sites to represent for water quality of stream of lake, and can be caused a change of water quality by long distance from analyzer to intake pipe. Therefore, it has carefully to evaluate selection of sample sites for real time monitoring system. Also, problems on the area has been to identify which parameters are best suited to monitoring stream of lake water and the differences, of analyzing results compared with manual analyzing. This paper presents some approaches to handle such problems, namely selection of sampling site and measurable parameters, to connect with bio-monitoring system solving a Limitation of measurable parameters, The bio-monitoring system of an early alarm that is desirable to perceive a toxic material inflow into stream can be applied to continuos water quality monitoring system effectively. Also, this paper presents to build a on line system transmitting immediately from a mobile a n a i m house or container to main monitoring center the results of analyzer by a telemeter.
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구봉근,라재웅,이재범,류연종,이현석 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.2
As concrete is prevented from shrinking freely, tensile stresses develop which frequently result in cracking. Cracks in reinforced concrete structures reduce overall durability by allowing the penetration of water and aggressive agents, thereby accelerating the deterioration of the reinforcing steel. Highway pavement, bridge decks, and industrial floors are especially susceptible to this type of deterioration since these structures exhibit high rates of shrinkage and are frequently exposed to aggressive environmental conditions. The objectives of this investigation included the implement of experimental procedures for assessing shrinkage cracking behavior on recycled aggregate concrete, the selection of replacement rate and mix composition on recycled aggregate concrete. Specifically, the influence of a shrinkage reducing admixture(SRA) and recycled aggregate concrete was investigated. The shrinkage reducing admixture substantially reduces free, shrinkage and restrained shrinkage cracking while providing similar mechanical properties. Restrained shrinkage experiments were developed and shrinkage cracking was shown to be size dependent and recycled aggregate replacement rate. A mechanical properties experiment approach was developed to predict the behavior of a variety of recycled aggregate concrete specimens. This experimentally approach was used to successfully explain experimental results from a variety of mixture compositions and recycled aggregate concrete. This experiment was used to demonstrate the influence of material and structural properties on the potential for cracking.
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구봉근,김창운,류택은,이재범,류연종,이현석 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.1
This study was performed to investigate the strength characterstics of steel fiber reinforced recycled aggregate concrete. Test specimens were prepared with compressive, split tensile, flexural specimens and tested by ultimate strength. A superplasticizer and fly-ash were added to the mix to improve performance of recycled concrete. Test-variables are substitution of recycled aggregate(0, 30, 50%), steel fiber length(0, 30, 50, 60mm), steel fiber content(0, 0.5, 1.0, 1.5%). Test-specimen were classified by test-variables. The experimental results on the various engineering properties of steel fiber reinforced recycled aggregate concrete using waste concrete are summarized as follows. It was found that the compressive and split tensile strength were proportionally affected by quantities of recycled aggregate substitutions, but flexural strength wasn't. The maximum compressive strength was 392 kgf/㎠( series 4 : R30 L30 V1.0 A20 ), the maximun split tensile strength was 40 kgf/㎠( series 7 : R30 L30 V1.5 A20) and the maximum flexural strength was 62 kgf/㎠( series 7 : R30 L30 V1.5 A20 ).
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류재근 ( Jae Kuen Ryu ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.1
Water quality is monitored at 1,016 points which are streams and sources for water supply in Korea. The monitoring carry out the measurement of 16 parameters of pH, BOD, SS, DO and so on with once a month, and of other parameters such like heavy metal with once a quarter. But most of the monitoring is carried out uncontinuously, so it is very difficult to understand exactly the changes of water quality compared with continuous monitoring. Therefore, real time monitoring system was equipped with basic parameters such as pH, temperature, DO, turbidity and electric conductivity at 25 major sources of water supply after installation of Noryangjin and Dukdo in 1974. But the systems have some problems which cannot be considered the sampling sites to represent for water quality of stream or lake, and can be caused a change of water quality by long distance from analyzer to intake pipe. Therefore, it has carefully to evaluate selection of sample sites for real time monitoring system. Also, problem on the area has been to identify which parameters are best suited to monitoring stream or lake water and the differences, of analyzing results compared with manual analyzing. This paper presents some approaches to handle such problems, namely selection of sampling site and measurable parameters, to connect with bio-monitoring system solving a Limitation of measurable parameters. The bio-monitoring system of an early alarm that is desirable to perceive a toxic material inflow into stream can be applied to continous water quality monitoring system effectively. Also, this paper presents to build a on line system transmitting immediately from a mobile analyzer house or container to main monitoring center the results of analyzer by a telemeter.
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급성 A형 간염에 동반된 Gianotti-Crosti 증후군 1예
이재동,이길주,송해준,이길도,김선두,김순제,류하근,박봉안,유재등,류주성,박형석,진춘조 대한소화기학회 2000 대한소화기학회지 Vol.36 No.4
Patient with Gianotti-Crosti Syndrome (GCS) presents with a distinctive self-limiting acral papular or papulovesicular eruption. Patient with GCS is associated with an underlying viral and bacterial illness. GCS is a self-limiting cutaneuous response to different infections. Its clinical differences are probably due to individual characteristics of each patient rather than the causative infections agents. GCS in patients infected with hepatitis A virus has not been reported previously in Korea. We report a case of 16-year-old girl who developed an erythematous papular eruption on her extremities a week after an epidemic of hepatitis A. The patient had the characteristics which resembled clinical and histopathologic findings of GCS. Hepatitis A virus RNA was detected by nested reverse transcription-polymerase chain reaction of tissue from lesion site of the patient.
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류재근,Ryu, Jae-Kuen 한국물환경학회 2004 한국물환경학회지 Vol.32 No.2
Water quality is monitored at 1,837 points which are streams and sources for water supply in Karea. The monitoring carry out the measurement of 16 parameters of pH, BOD, SS, DO and so on with once a month, and of other parameters such like heavy metal with once a quarter. But most of the monitoring is carried out uncontinuously, so it is very difficult to understand exactly the changes of water quality compared with continuous monitoring. Therefore, real time monitoring system was equipped with basic parameters such as pH, temperature, DO, turbidity and electric conductivity at 25 major sources of water supply after installation of Noryangjin and Dukdo in 1974. But the systems have some problems which cannot be considered the sampling sites to represent for water quality of stream of lake, and can be caused a change of water quality by long distance from analyzer to intake pipe. Therefore, it has carefully to evaluate selection of sample sites for real time monitoring system. Also, problems on the area has been to identify which parameters are best suited to monitoring stream of lake water and the differences, of analyzing results compared with manual analyzing. This paper presents some approaches to handle such problems, namely selection of sampling site and measurable parameters, to connect with bio-monitoring system solving a Limitation of measurable parameters, The bio-monitoring system of an early alarm that is desirable to perceive a toxic material inflow into stream can be applied to continuos water quality monitoring system effectively. Also, this paper presents to build a on line system transmitting immediately from a mobile analyzer house or container to main monitoring center the results of analyzer by a telemeter.
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김건호,김명희,이옥재,황일용,안인옥,심대석,원용환,류경렬,지혜기 대한내과학회 1994 대한내과학회지 Vol.47 No.1
We report a case of renal papillary necrosis which has recurrent urinary tract infections, partial unilateral ureteral obstruction, and the classic cavity pattern by I.V.P.. Renal papillary necrosis is defined as an ischemic necrosis involving the renal medulla which, in the absence of localizing obstructive or vascular factors, is generally bilateral and most often is associated with infections of the urinary tract. The clinical course is characterized by lumbar pain, hematuria, pyuria, bacteriuria, and sepsis; occasionally also by the passage of whole renal papillae or sections there of in the urine. The diagnosis can sometimes be made by finding pieces of renal medullary tissue in the urinary sediment. Pyelography may demonstrate cavities and sinuses in the region of the papillae. The classic ring-shadow pattern results from detachment of a papilla and its outline within the contraet-filled cavity.
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