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Cyclic Strength and Deformation Characteristics of Marine Cohesive Soil
김용성,서민우,오상은,Kim, Yong-Seong,Seo, Min-Woo,Oh, Sang-Eun The Korean Society of Agricultural Engineers 2012 한국농공학회논문집 Vol.54 No.3
본 연구에서는 해성 점성토에 대하여 반복 삼축시험을 실시하고 응력-변형률 관계 및 유효응력경로 특성 분석을 통해 동적 변형 및 강도 특성을 조사하였다. 시험에 사용된 시료는 일본 도쿠시마현의 코마츠시마 항 인근에서 채취된 점성토이며, 반복 삼축시험으로 동적 비배수 삼축시험, 동적 비배수 삼축시험 후 동적 삼축변형시험, 다단계 동적 비배수 삼축시험, 동적 삼축 변형시험 등 4종류의 시험을 수행하고, 시험 주파수로서 0.1 및 0.01 Hz을 적용하였다. 본 연구 결과 0.01 Hz로 수행된 동적 삼축시험 결과는 0.1 Hz로 수행된 삼축시험 결과보다 평균유효응력의 감소량이 크며, 반복 하중은 해성 점성토의 구조적 약화를 초래하고 초기 거동시 발생하는 간극수압과 밀접하게 관련이 있는 것으로 나타났다. 또한 미소변형률 영역에서 등가 탄성계수는 시험 횟수가 증가함에 따라 점차 감소하며, 감쇠비는 점차 증가하는 것으로 보아 변형계수는 반복 하중으로 인한 전단변형률의 축척에 따른 변형률 의존 거동에 관련하는 것으로 판단된다.
6H-SiC 위에 형성한 에피택시 AIN 박막 구조에 대한 전기적 특성의 평가온도 의존성
김용성,김광호,Kim Yong-Seong,Kim Kwang-Ho 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.1
Epitaxial aluminum nitride films on 6H-SiC (0001) were fabricated using reactive RF magnetron sputtering and post-deposition rapid thermal annealing. The electrical properties of AIN films depending on film thickness and measurement temperature have been observed. Full width at half maximum of AIN (0002) was $0.1204^{\circ}$ (about 430 arcsec) X-ray rocking curve results. The equivalent oxide thickness (EOT) of AIN film was estimated as about 10 nm and the leakage current density was within the order of $10^{-8} 4/cm^2$. The dielectric constant of AIN film estimated from the accumulation region of C-V curve measured at $300^{\circ}C$ was 8.3. The dynamic dielectric constant was obtained as 5.1 from J vs. 1/T plots at the temperature ranging from R.T. to $300^{\circ}C$ From above, estimation temperature dependance of the electrical properties of Al/AIN/SiC MIS devices was affirmed and useful data compilation for the reliabilities of SiC MIS is expected.
도시내 가로변 빌딩이 도로 이면지역의 소음에 미치는 영향
김용성,한찬훈,Kim, Yong-Seong,Haan, Chan-Hoon 한국음향학회 2019 韓國音響學會誌 Vol.38 No.3
가로변 이면지역에 위치한 노후된 공동주택은 주도로의 교통소음의 피해를 받는다. 이면지역의 소음은 가로면 건물의 높이와 주도로와의 이격거리, 그리고 도로변 건물간의 이격거리 및 도로변 건물간의 높이차이에 의하여 영향을 받는다. 본 연구는 한 도시 내의 15개의 블록을 선정하여 가로변 건물배치형태를 1)블록에 단일건물이 배치된형태, 2)블록에 다수의 건물이 하나의 축으로 연속하여 배치된 형태로 분류하였으며, 가로변과 이면지역에서 도로교통소음을 동시에 측정하여 가로변의 건물 배치형식에 따른 이면지역소음의 상관성을 분석하였다. 분석결과, 이면지역으로 전달된 도로교통소음은 가로변에 배치된 건물의 높이, 건물과 건물간의 이격된 거리, 인접한 건물의 높이차에 영향을 받으며 건물의 너비에 의한 소음도의 감소는 나타나지 않았다. 가로변에 위치한 건물의 높이가 4 m(단층)인 경우 이면지역의 소음도는 12 dB(A)감소하였으며 높이가 4 m 증가할 때마다 2 dB(A)씩 감소하는 것으로 나타났다. 또한 인접한 두 건물의 높이차가 4 m 증가할 때마다 이면지역의 소음도는 1 dB(A)씩 증가하였으며, 인접한 두 건물의 이격된 거리가 0.5 m 증가할 때마다 이면지역의 소음도는 1 dB(A)씩 증가하는 것으로 나타났다. The old residences and shops in the backside blocks are affected by the traffic noises from the main road. The noise of the backside roads is affected by the following factors such as the height of the roadside buildings, the distance between the road and the backside streets, distance among adjacent roadside buildings, and the difference of the adjacent building heights. The both noise levels on the road and the backside street were measured simultaneously in 15 urban blocks of a city which can be categorized into two types of roadside building plans ; 1) one single building along the street, 2) buildings arranged on one axis beside the road. As the results, there is no significant noise reduction due to the width of the buildings in general. However, in the cases of buildings arranged on one axis beside the road, it was found that the average noise reduction was 12 dB(A) on the basis of the building height of 4 m. Also, it was analysed that for each 4 m increase in the building height, noise reduction occurred by 2 dB(A) beyond building height of 4 m. In general, it was proved that the noise of the back streets is mainly affected by the lowest height of the roadside buildings. It was found that noise is increased by 1 dB(A) for each 4 m increase of the height difference between adjacent buildings. Also, It was revealed that for each 0.5 m increase in the distance between roadside building, noise reduction decreased by 1 dB(A).
모형실험에 의한 콘크리트 표면차수벽형 석괴댐의 주응력비 특성 분석
김용성,Kim Yong-Seong 한국농공학회 2006 한국농공학회논문집 Vol.48 No.4
In present study, the principal stress condition needed to conduct cubical large-scale triaxial test which can reflect three dimensional stress condition (or plain strain condition) in a dam was investigated by performing model test and numerical analysis and the principal stress ratio varying with the height of CFRD was examined. Also, the principal stress ratio in CFRD body was investigated from the monitoring results of horizontal and vertical earth pressure gages, installed in the center zone and lower part of transition zone of the dam body, respectively, in order to consider the principal stress condition in the large-scale triaxial test to model the behavior of CFRD. The result of the study indicated that the principal stress ratio decreased gradually from the lower to the upper part in the dam body for its center axis and was about 0.5 and 0.2 in the lower and upper part, respectively.
표준간극비를 이용한 콘크리트 표면차수벽형 석괴댐 축조재료의 다짐 관리
김용성,Kim Yong-Seong 한국농공학회 2006 한국농공학회논문집 Vol.48 No.4
In this study, construction modulus, void ratio and settlement characteristics of 38 CFRD in domestic and foreign countries were investigated from monitoring data. The effect of field dry density and void ratio to dam body was analyzed. The standard void ratio of CFRD that can be easily used by dam designers and field engineers was proposed from the monitoring data. It was confirmed that we can get the degree of compaction needed for reasonable compaction of dam body by calculating the field dry density from inverse operation of the standard void ratio. It was thought that the void ratio of CFRD depends on shape coefficient and in case of a high shape coefficient, the void ratio was high with its void ratio 0.17 -0.38.
삼기지황탕가단삼(蔘?地黃湯加丹蔘), 대황(大黃), 홍화(紅花)가 Streptozotocin으로 유발된 생쥐의 당뇨병성(糖尿病性) 신증(腎症)에 미치는 영향
김용성,조현주,Kim, Yong-Seung,Cho, Hyun-Joo 대한한방내과학회 2005 大韓韓方內科學會誌 Vol.26 No.4
This study was carried out to investigate the preventive effect of Salviae Miltiorrhizae Radix, Rhei Rhizoma and Carthami Flos combined with Samgijiwhang-Tang(SJTSRC) on streptozotocin(STZ)-induced diabetic nephropathy. Rats were divided into a control group of rats with STZ-induced diabetic nephropathy, a sample group of those given SJTSRC, and a normal group. In the experiment diabetic nephropathy was induced by giving STZ(60mg/kg) to rats via the peritoneum, and effects were assessed with measures of serum creatinine, serum BUN, secretion content of albumin and glucose content of urine, malondialdehyde(MDA) and glutathione(GSH) content in cortex of kidney. When STZ was injected into sample rat, the value of creatinine and BUN increased validly and STZ did damage to the kidney. When applying SJTSRC to sample rats, the value of serum creatinine decreased validly but the value of serum BUN decreased invalidity. It was confirmed that SJTSRC had an effect on recovery after kidney damage and secretion content of albumin increasedafter administration of SJTSRC but there was no change in glucose content of urine compared with the control group. The decrease of secretion of albumin after injection of STZ was taken to mean progressive diabetic nephropathy, and that reversal of that trend after SJTSRC administration showed that kidney function had improved, not through decreasing blood sugar, but through other factors. Results suggest that diabetic nephropathy was induced by STZ, and SJTSRC was effective in restricting the extent of damage to the kidney and halting the progression of diabetic nephropathy with improvement in levels of serum creatinine and albumin secretion. More study is needed, particularity pertaining to anti-oxidative effects in the kidney cortex.
Polydimethylsiloxane을 함유한 poly(N-isopropylacrylamide)? 합성 및 성질
김용성,배민애,윤구식,Kim, Young-Sung,Bae, Min-Ae,Yoon, Koo-Sik 대한화학회 2001 대한화학회지 Vol.45 No.3
양 밀단에 methacryl기를 함유한 polydimethylsiloxane(PDMS)을 가교제로 하여 poly(N-isopropylacrylamide)(PNIPAAm)을 합성하여 PDMS를 함유한 PNIPAAm을 얻었다. IR, DSC를 이용하여 그것들의 성질을 조사하였으며 DSC 조사결과 PNIPAAm과 PDMS는 각각 분리된 상으로 존재하는 것이 확인되었으며, PNIPAAm의 $T_g$는 PDMS의 함량이 증가하면 약간씩 감소하였다. 또한 온도에 따른 팽윤도를 조사한 결과 PDMS의 함량이 증가하면 팽윤도는 감소하였으나 lower critical solution temperature(LCST)는 큰 변화가 없었다. 수팽윤된 중합체의 DSC 측정결과도 LCST는 PDMS의 함량에 영향을 받지 않는 다는 것을 확인하였다. Poly(N-isopropylacrylamide) (PNIPAAm) containing polydimethylsiloxane (PDMS) was synthesized using PDMS as crosslinking agent, and characterized by IR and DSC. It seems that the copolymer has separated phases, PNIPAAm and PDMS. The $T_g$ of PNIPAAm was decreased in accordance with the increase of PDMS-contents. The swelling behavior of polymer in water was examined with the function of temperature and PDMS-contents as well. The equilibrium swelling ratio of polymer in water was decreased with increasing PDMS-contents, but lower critical solution temperature (LCST) was not significantly affected by the incorporated PDMS-contents.