• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.2C
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• pp.81-88
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• 2006

This study performed field and laboratory tests for poor subsoils taken in six regions of the country and determined undrain shear strength. Su values and preconsolidation pressure are predicted using Back Propagation neural network (BPNN) and the application of BPNN is verified. The result of BPNN shows that correlation coefficient between test and neural network result is over 0.9, which means high correlativity. Especially the neural network uses only 6 parameters such as natural water content, void ratio, specific gravity, rate of passing 200th sieve, liquid limits and plasticity index among various affecting factors to estimate value and the correlation coefficent is 0.93. The conclusions obtained in this paper are from the tests performed for poor subsoils taken in the several regions of the country. If there were more test results, the prediction and influence of various soil properties could be effectively performed by neural network.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.26 no.5
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• pp.300-313
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• 2014

Most analytical solutions for wave-induced soil response have been mainly developed to investigate the influence of the progressive and standing waves on the seabed response in an infinite seabed. This paper presents a new analytical solution to the governing equations considering the wave-induced soil response for the partial standing wave fields with arbitrary reflectivity in a porous seabed of finite thickness, using the effective stress based on Biot's theory (Biot, 1941) and elastic foundation coupled with linear wave theory. The newly developed solution for wave-seabed interaction in seabed of finite depth has wide applicability as an analytical solutions because it can be easily extended to the previous analytical solutions by varying water depth and reflection ratio. For more realistic wave field, the partial standing waves caused by the breakwaters with arbitrary reflectivity are considered. The analytical solutions was verified by comparing with the previous results for a seabed of infinite thickness under the two-dimensional progressive and standing wave fields derived by Yamamoto et al.(1978) and Tsai & Lee(1994). Based on the analytical solutions derived in this study, the influence of water depth and wave period on the characteristics of the seabed response for the progressive, standing and partial standing wave fields in a seabed of finite thickness were carefully examined. The analytical solution shows that the soil response (including pore pressure, shear stress, horizontal and vertical effective stresses) for a seabed of finite thickness is quite different in an infinite seabed. In particular, this study also found that the wave-induced seabed response under the partial wave conditions was reduced compared with the standing wave fields, and depends on the reflection coefficient.

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
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• 2006.05a
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• pp.146-150
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• 2006

도축 후 2일째 가열 감량은 시험구(골반골 현수)가 대조구(아킬레스건 현수)에 비하여 유의적으로 감량이 높았으나, 드립량에 있어서는 반대의 결과를 보였으며, 전체 감량은 두 처리구간 차이가 없었다. 연도의 지표인 전단력가는 대조구 $6.45kg/cm^2$로 시험구 $5.52kg/cm^2$에 비하여 유의적으로 높았으며, 골반골 현수를 통하여 도축 후 8일차의 대조구의 전단력 수준을 보여 숙성기간을 약 1주일 정도 단축이 가능하였다. 근절길이는 대조구 $1.93{\mu}m$, 시험구 $2.48{\mu}m$로 시험구가 유의적으로 길어 골반골 현수에 의한 단축 억제 효과로 볼 수 있다. 관능 평가 결과 도축후 2일차에는 대조구에 비하여 시험구가 다즙성, 연도, 향미, 기호성에서 유의적으로 높은 값을 보였으나, 도축 후 8일째에는 대조구와 시험구간에 차이를 보이지 않았다. 출하 연령과 현수방법에 따른 대퇴이두근의 물리적 특성을 비교한 결과로서 근절길이는 모든 월령에서 시험구가 대조구에 비하여 길었다. 전단력은 시험구가 대조구에 비하여 유의적으로 낮은 결과를 보였다. 골반골 현수에 의한 전단력가 감소 효과는 출하 월령이 많을수록 효과가 큰 것으로 나타났다. 드립 발생율은 대조구가 시험구에 비하여 유의적으로 높은 경향을 보였다. 가열 감량과 보수성은 처리구에 관계없이 유의적인 차이를 보이지 않았다. 관능 특성을 비교한 결과 30개월 미만의 경우에는 유의적인 차이를 보이지 않았으나, 30개월 이상에서는 처리구가 대조구에 비하여 다즙성 연도, 향미, 기호성 모두 우수한 것으로 나타났다. 특히 골반골 현수는 출하 월령이 증가됨에 따라 관능 특성의 개선율이 높은 것으로 나타났다. 수 있다.분별을 성공적으로 수행하였다.(p<0.05), 맛, 연도, 다즙성 및 전체적인 기호성은 유의한 차이가 없었다.자체를 악하다고 볼 수 없고 더구나 구원을 이 세상에서의 이탈로 볼 수 없다. 진정한 구원이란 원래 하나님이 보시기에 아름다웠던 그 세상으로의 회복을 포함한다. 이런 면에서 하나님 주권 신앙 하에서 구원이란 전 인격적인 구원, 전 우주적인 구원이 된다. 그렇기 때문에 성도는 세상의 삶과 학문, 예술, 정치, 경제, 사회를 포함한 모든 분야를 하나님의 뜻 가운데서 그 원래의 목적에 부합할 수 있도록 회복시키는 일에 적극 참여해야 한다.자체가 이를 주도하기는 사실 어려움이 있다. 그리고 대형유통점이 영업행위를 영업시간제한에서부터 출점제한에 이르기까지 규제하는 건은 심사숙고하여야 한다. 대형유통점이 국가경제 및 지역사회에 미치는 영향이 부정적인가 긍정적인가에 대해 국내외 학계와 업계에서 여전히 많은 논란이 있기 때문이다. 정부와 지자체에 의한 시장개입은 반드시 필요한 경우에 한해 합당한 방법에 의해 이루어져야 한다. 대형유통점에 대한 규제는 지역사회에 미치는 영향을 다면적으로 평가한 결과에 근거하여 이루어져야 할 것이다. 대부분의 지자체는 체계적인 평가시스템과 객관적인 통계 자료를 갖고 있지 못한 실정이다. 향후 가장 시급한 과제는 시장개방 이후 지난 10년간 대형유통점이 지역사회에 미친 영향에 관한 광범위한 통계자료를 수집하고 이를 체계적으로 분석하여 정책방향을 올바르게 설정하는 것이라 할 수 있다.i와 K. pneumoniae가 존재하며 확산 중임을 시사한다. 앞으로 CTX-M형 ESBL의 만연과 변종 CTX-M형 ESBL의 출연을 감시하기 위한 정기적인 연구와 조사가 필요한 것으로 생각한다., A2-1, B1-1, B2-1의 경우,

• Journal of Environmental Health Sciences
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• v.24 no.1
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• pp.132-140
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• 1998

Laboratory-scale experiments were conducted using a three-stage rotating biological contactor unit followed by lime precipitation and sedimentation with effluent recycle to the first stage. The purpose of this study was to evaluate the effects of hydraulic loadings of 0.031-0.076 $m^3/m^2/d and recycle ratio of 1 to 3 on the simultaneous removal of organics and nutrients from domestic wastewater. Lime was added to maintain pH of 10.4-11.0 in the coagulation-flocculation reactor. Results showed that the highest nitrogen removal rate of 70.5% occurred at the lower hydraulic loading of 0.031 $m^3/m^2/d at a recirculation rate of 300%, and similarly, highest nitrification occurred at the same hydraulic loading and recycle ratio. Concentration of ammonia nitrogen in the effluent was less than 1 mg/l at the same operating conditions for higher nitrogen removal. Whereas, high BOD and COD removal was observed at hydraulic loading rate of 0.054 $m^3/m^2/d, and high removal of organic matter was evident from the consistent low COD and BOD value. Results obtained from the operating condition of higher loading rate, 300% of recycle rate showed the highest removals. Increasing in recycle rate and hydraulic loading rate increased the volatile solids fraction of the sludges generated to the extent of 47% at 0.076 $m^3/m^2/d hydraulic loading and 300% recirculation rate. Since pH in the flocculator was maintained at the pH of 10.4-11.0, above 90% removal of phosphorus was obtained. Average concentration of suspended solids was always maintained over 40 mg/l in the effluent. Therefore an RBC unit operating at a hydraulic loading near 0.031 $m^3/m^2/d with a recycle rate of 300% is a viable and feasible alternate conditions to produce an effluent with relative low organic matter and phosphorus, provided that there is a neutralization unit to control the pH and SS of the effluent.

• Journal of the Korean Geotechnical Society
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• v.31 no.6
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• pp.27-44
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• 2015

An analytical solution of dynamic responses for seabed in finite and infinite thicknesses including shallow has been developed under flow and partial standing wave with arbitrary reflection ration coexisting field at a constant water depth condition. In the analytical solution, a field was simply transited to a coexisting field of progressive wave and flow when reflection ratio was 0 and to a coexisting field of fully standing wave and flow when reflection ratio was 1. Based on the Biot's consolidation theory, the seabed was assumed as a porous elastic media with the assumptions that pore fluid is compressible and Darcy law governs the flow. The developed analytical solution was compared with the existing results and was verified. Using the analytical solution the deformation, pore pressure, effective and shear stresses were examined under various given values of reflection ratio, flow velocity, incident wave's period and seabed thickness. From this study, it was confirmed that the dynamic response of seabed was quite different depending on consideration of flow, which causes changing period and length of incident and reflection waves. It was also confirmed that dynamic response significantly depends on the magnitude of reflection ratio.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.6
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• pp.2267-2275
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• 2013

Existing conventional model for analysis of shallow water flow just assumed the internal boundary condition as free-slip, which resulted in the wrong prediction about the velocity, vorticity, water level, shear stress distribution, and time variation of drag and lift force around a structure. In this study, a finite element model that can predict flow characteristics around the structure accurately was developed and internal boundary conditions were generalized as partial slip condition using slip length concept. Laminar flow characteristics behind circular cylinder were analyzed by varying the internal boundary conditions. The simulation results of (1) time variations of longitudinal and transverse velocities, and vorticity; (2) wake length; (3) vortex shedding phenomena by slip length; (4) and mass conservation showed that the vortex shedding had never observed and laminar flow like creeping motion was occurred under free-slip condition. Assignment of partial slip condition changed the velocity distribution on the cylinder surface and influenced the magnitude of the shear stress and the occurrence of vorticity so that the period of vortex shedding was reduced compared with the case of no slip condition. The maximum mass conservation error occurred in the case of no slip condition, which had the value of 0.73%, and there was 0.21 % reduction in the maximum mass conservation error by changing the internal boundary condition from no slip to partial slip condition.

• Korean Journal of Poultry Science
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• v.41 no.1
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• pp.61-68
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• 2014

This study were investigated the effects of dietary supplementation of yacon by-products and mugwort powder on performance, carcass characteristics, pH, TBARS (thiobarbituric acid reactive substance), WHC (water holding capacity), shear force and meat color of broiler thigh meat. Broiler chicks were fed diets for five weeks containing 0% yacon by-products and mugwort powder (Control), 0.5% yacon by-products powder (T1), 1.0% yacon by-products powder (T2), 0.5% mugwort powder (T3), and 1.0% mugwort powder (T4). There were no significant difference in performance among treatments, but mortality was decreased in diets by the supplementation of yacon by-products and mugwort powder than that of control. The total cholesterol, LDL-cholesterol and triglyceride of control were higher than treatment groups and HDL-cholesterol of control was lower than treatment. The TBARS was significantly decreased by the supplementation of yacon by-products and mugwort powder compared to the control (P<0.05), especially, mugwort powder treatment group was significantly (P<0.05) more effective in improving freshness compared to other treatment groups. The WHC and shear force were not significantly different. CIE $L^*$ and $a^*$ value of treatment groups showed significantly higher value compared to the control, however, no difference in the CIE $b^*$ values was observed among treatment groups. In conclusion, a supplementation of yacon by-products and mugwort powder were effective in decreasing TBARS, total cholesterol and LDL-cholesterol and increasing HDL-cholesterol concentration. Mugwort powder supplementation was most effective.

• Journal of Animal Environmental Science
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• v.18 no.3
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• pp.165-172
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• 2012

This study was designed to determine the effect of different floor space and type of finishing building on performance, behaviour and carcass quality of finishing pig. Three hundred and thirty six finishing pigs were alloted into two space allowance ($1.0m^2$and $2.5m^2$/pig) and two floor type (concrete slat and bedded with sawdust) of finishing building. There was no significant difference between the different space allowance in the body gain, feed intake and feed per gain. And also floor type of finishing building was not affected by the performance of finishing pig. Space allowance per pig affected the maintenance behaviour, but there was no significant difference between the floor type of finishing building in the spent time on lying, sitting and standing. Floor type was affected by the occurrence of standing behaviour, the finishing pigs in the bedded with sawdust showed less occurrence of standing. Carcass traits did not show any significant difference due to the difference of space allowance and floor type of finishing building. There was no significant difference in the chemical compositions of pork loin between the space allowance and floor type of finishing building.

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
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• 2005.05a
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• pp.247-252
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• 2005

본 연구는 파슬리 등의 야채를 첨가하여 제조되는 화이트소시지의 물성 및 저장성에 미치는 자두 분말의 효과를 조사하기 위해 실시되었다. 물성의 변화로서 pH는 자두의 첨가율이 증가함에 따라 상대적으로 감소 하였는데 3% 첨 가시 전 저장 기간 중 가장 낮게 ($pH\;5.11\;{\sim}\;4.44$) 나타났다. 육색(meat color)은 자두의 첨가량에 비례하여 적색도(redness)를 나타내는 a-value에서 높게 나타났으며 명도 (light ness)를 나타내는 L-value에서는 상대적으로 낮은 수치를 보여주었다. 전단력(Shear stre ngth) 측정에서는 저장 기간 중 자두 분말의 첨가량에 비례 하여 근소한 차이를 나타냈는데 저장 7일째에서 가장 높았다. 자두 분말 첨가구 에서의 다소 높은 전단력의 결과는 보수력 (WHC) 측정 에서도 같은 경향을 나타내었는데 자두 분말의 증가량에 따라 3% 첨가구가 대조구 (0%)보다 낮게 나타나 약한 보수성을 보여 주었다. 저장성에 미치는 결과로서 총세균수의 측정결과 저장 3일이 경과한 구간에서 Sorbic acid (0.07%)의 첨가구와 자두 분말(3%) 첨가구 에서 비슷한 항균 효과를 나타내었다. 이 같은 동일한 수준의 항균 효과는 저장 9일째에도 같은 경향으로 나타났다. VBN 측정에는 저장 기간에 따라 증가된 수치를 나타냈는데 저장 7일 및 8일, 9일째 측정 결과는 3% 자두분말 첨가구와 0.07% Sorbic acid 첨가구 와 비슷한 수준을 나타내어 동일한 저장효과를 보여 주었다. 관능검사 실시 결과 총체적인 풍미에 있어서는 자두 분말 첨가구 1.5%가 가장 우수 했으며 다음으로는 3%, Sorbic acid 첨가구 및 공시료 순으로 나타났다.간에 유의차는 나타나지 않았다.pm을 spiking한 후 SPE상에서 SCX(Strong cation exchange column)을 통한 clean-up과정을 거친 후의 STP의 limit of quantification(LOQ)는 약 0.44ppm이었으며, 이에 대한 회수율은 89.7${\pm}$2.3%(n=6)를 나타냈다. 실제 CODEX에서 권장한 우유의 MRL이 0.6ppm인 점을 감안하면 CODEX권고치에 도달할 수 있는 것으로 판단되었다. 따라서 본 연구에서 개발 된 시험법은 지금까지 국내적으로 STP에 대한 시험법이 확립되어 있지 않은 것으로 이와 아울러 간편한 parallux와 병용해 STP에 대한 정량 및 정성 분석을 유도체화 장치 및 형광검출기를 이용해 잔류항생물질 STP에 대한 분석시험법을 개발하였다.화와 네트워크 조직망 구축을 위한 지역중심의 복합 생활문화 공간이 필요할 것이며, 이를 촉진키 위한 mentor academy시스템 접근을 통해 점점 고령화되어 가고 있는 재래시장에 대해 차별적 특성이 반영된 종합적이고 체계적 접근 방법연구가 필요하다./TEX> 자체기술개발, 선진기술 도입, 산업간 및 산업내 기술확산, 국제기술협력 ${\rightarrow}$ 기술혁신의 촉진 ${\rightarrow}$ 총요소생산성과 기업경쟁력(자원 및 역량, 프로세스 경쟁력, 품질경쟁력, 시장경쟁력, 고객성과, 시장성과, 재무성과)의 제고 ${\rightarrow}$ 가격경쟁력(임금, 금리, 물류비용, 환율 등)과 비(非)가격경쟁력(디자인, 에프터서비스, 품질, 운송 등)의 제고 ${\rightarrow}$ 국가경쟁력의 제고 ${\rig

• Journal of the Korean Wood Science and Technology
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• v.35 no.6
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• pp.23-30
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• 2007

Round piles of Korean larch were excavated from the foundation of ex-Chosunchongdokbu (ex-Chosun Governer-General Building), which was constructed in 1916 and dismantled later in 1996. By the record (Huh, 1996), the Korean larch logs were logged from the Yalu river area near Mt. Baekdu in North Korea. At present, however, Korean larch is not so popular in South Korea. The latewood ratio profiles and strength properties (longitudinal compression, shear, longitudinal tensile, and bending) were obtained. The ratio of latewood from pith to bark increased up to 25 years, and then it showed constant tendency at 40% with some variances. From the microscopic observation, however, the latewood ratio decreased from the heartwood to the sapwood. Compression strength was greater and bending strength was a little lower than the previous reports (references 13~15), which might be attributed to the strength reduction of old structural members by aging or damage in the compression specimens than the bending ones. The flat-grained specimens for the shear and tension test showed higher coefficient of variation (COV) than the edge-grained ones. For the better comparison of results, in case of shear and tensile strength tests, the strength values of the edge-grained specimens were thought to be adopted rather than those of flat-grained ones.