• Structural Engineering and Mechanics
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• 제46권5호
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• pp.645-672
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• 2013

The differential settlements and rotations among footings cannot be avoided when the frame-footing-soil system is subjected to seismic/dynamic loading. Also, there may be a situation where column(s) of a building are located near adjoining property line causes eccentric loading on foundation system. The strap beams may be provided to control the rotation of the footings within permissible limits caused due to such eccentric loading. In the present work, the seismic interaction analysis of a three-bay three-storey, space frame-footing-strap beam-soil system is carried out to investigate the interaction behavior using finite element software (ANSYS). The RCC structure and their foundation are assumed to behave in linear manner while the supporting soil mass is treated as nonlinear elastic material. The seismic interaction analyses of space frame-isolated footing-soil and space frame-strap footing-soil systems are carried out to evaluate the forces in the columns. The results indicate that the bending moments of very high magnitude are induced at column bases resting on eccentric footing of frame-isolated footing-soil interaction system. However, use of strap beams controls these moments quite effectively. The soil-structure interaction effect causes significant redistribution of column forces compared to non-interaction analysis. The axial forces in the columns are distributed more uniformly when the interaction effects are considered in the analysis.

• Earthquakes and Structures
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• 제4권5호
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• pp.471-487
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• 2013

Performance of a prototype base isolated building located at Indian Institute of Technology, Guwahati (IITG) has been studied here. Two numbers of three storeyed single bay RCC framed prototype buildings were constructed for experimental purpose at IITG, one supported on conventional isolated footings and the other on a seismic isolation system, consisting of lead plug bearings. Force balance accelerometers and a 12 channel strong motion recorder have been used for recording building response during seismic events. Floor responses from these buildings show amplification for the conventional building while 60 to 70% reduction has been observed for the isolated building. Numerical models of both the buildings have been created in SAP2000 Nonlinear. Infill walls have been modeled as compression struts and have been incorporated into the 3D models using Gap elements. System identification of the recorded data has been carried out using Parametric State Space Modeling (N4SID) and the numerical models have been updated accordingly. The study demonstrates the effectiveness of base isolation systems in controlling seismic response of isolated buildings thereby leading to increased levels of seismic protection. The numerical models calibrated by relatively low level of earthquake shaking provides the starting point for modeling the non-linear response of the building when subjected to strong shaking.

• Asian Pacific Journal of Cancer Prevention
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• 제15권5호
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• pp.1937-1941
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• 2014

Aims: To evaluate anti-cancer activity of Asparagus racemosus (AR) leaf extract on UOK146, a renal cell carcinoma cell line, and explore its mechanism of action. Materials and Methods: Dried AR leaves were extracted with chloroform and dissolved in DMSO. This extract was applied to UOK146 and cell death was estimated by MTT assay. In addition PRCC-TFE3 fusion transcripts were detected by real time PCR. Results: Extract was found to be cytotoxic with an $IC_{50}$ of 0.9 mg/ml as estimated by dose response curve. Antitumor activity of the permissible doses of the extract was assessed by the down regulation of PRCC-TFE3 fusion transcript (38%) responsible for oncogenicity of the UOK146 cell line. No increment in the BAX, a proapoptotic marker level was observed. Conclusions: Evidence of antiproliferative effect, PRCC-TFE3 fusion transcript inhibition and static BAX level clearly indicate that AR extract provides or elicits an apoptosis independent anticancer effect on RCC cells by some specific mechanism of regulation.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 춘계 학술논문 발표대회 학계
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• pp.87-91
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• 2009

This study investigates possibility for practical use through small sized test with OPC and substituted fly ash 10% and return coarse cement (RCC), classed 1100${\sim}$1200 cm2/g, which is made by Cyclone Separator at cement producing process 20% (CF) for OPC. The experimental factors are 48% of W/B and OPC and 2 kinds of concrete proportions. The target slump and air content are $150{\pm}25$ mm and $4.5{\pm}1.5$ %. For the results, the flowalility and air content of CF are less than OPC because it needs more superplasticiser and air-entraining agent. The temperature history of CF is lower than OPC about $6{\sim}10^{\circ}C$. For the strength properties, CF is less than OPC, but their gap is declined at 28 days. The strength of the specimens are ordered by standard curing, field cured specimens, and core specimens.

• 한국전통조경학회지
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• 제35권2호
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• pp.77-86
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• 2017

부산 범어사 등나무군락지에 대한 개체군생태학 연구가 이루어졌다. 연구지역은 1966년에 천연기념물 제176호로 지정되어 보호되고 있는데, 국내에서 자생적 기원을 가지며 등나무가 대규모의 군락을 이루고 있는 경우는 매우 희귀하여 높은 학술적 가치를 지닌다. 그러나 범어사 등나무군락은 군락지 내의 등나무 분포 현황 및 생태에 대한 해상도 높은 연구는 이루어지지 않았다. 본 연구는 등나무군락 내의 개체 분포 현황과 개체군 특성을 확인하고, 보존방안을 논의하는데 그 목적이 있다. 현장 조사를 통해 범어사 등나무군락과 그 일대를 대상으로 등나무의 분포, 근원직경, 감고 올라가는 방향 및 식물종과 연구지역 내 식물상에 대한 현황을 파악하였다. 그 결과, 연구지역 내 등나무 개체 수는 총 1,158개체가 확인되었고, 등나무의 근원직경은 평균 69.0 mm (${\pm}45.5$), 최대 365 mm로 나타났다. 감는 방향은 시계방향으로 감는 등나무뿐만 아니라 반시계방향으로 감는 등나무 40개체가 확인되었다. 등나무의 등반식물종은 28분류군으로 확인되었고, 그 중 동종(同種)인 등나무를 가장 선호하는 것으로 나타났다. 등나무군락은 계곡부에 인접하여 분포하고 있는 것으로 확인되었으며, 지속적인 교란에 의해 유지 발달하고 있는 군락으로 파악되었다. 현존식생도를 통해 계곡림에 76.6%의 개체가 분포하는 것으로 확인되었으며, 개서어나무-이대우점림, 칡군락, 소나무우점림 등에서는 상대적으로 분포가 배제되는 것으로 밝혀졌다. 본 연구는 확산되어가고 있는 등나무개체군과 최대 근원직경을 가지는 등나무의 보호, 지역 서식처 보존 등을 위하여 지속적인 모니터링을 통한 후속 연구를 진행함과 동시에 천연기념물 제176호 보호 지역의 수정과 서식처에 대한 간섭을 최소화하기 위한 방안의 마련 등을 제안하였다.

• 한국식품저장유통학회지
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• 제16권3호
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• pp.305-310
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• 2009

관행재배 과원의 토양에 여러 유기질 퇴비를 시비하였을 경우 배 과실의 품질특성의 차이를 구명하고자 실시하였다. 8년생 신고배에 쌀겨퇴비, 커피박퇴비, 키친퇴비(미생물지킴이(R)) 및 위의 3종 유기질 비료 복합 처리구를 배치하고 주당 10 kg 을 시비하였고, 대조구는 화학비료를 주당 60 g 시비하였다. 과실당도나 경도, 산도에서는 복합처리구에서 대조구보다 높았고 석세포 함량은 모든 유기질 비료처리구에서 대조구보다 낮았다. 과피와 과육에서의 DPPH 라디컬 소거활성은 모든 처리구에서 대조구보다 높아지는 경향을 나타냈고, 페놀화합물 함량도 과피와 과육에서 대조구보다 높은 경향을 나타냈다. 과피의 페놀화합물 함량은 처리구에 상관없이 과육보다 6배 정도 높은 경향을 나타냈다. 이상의 결과로 보아, 화학비료를 대체한 유기질 비료의 시용으로 배 과실내 석세포 감소와 품질 특성의 향상과 총 페놀함량 증가 및 DPPH 라디컬 소거활성이 증가하였다.

• 한국산학기술학회논문지
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• 제21권1호
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• pp.401-408
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• 2020

현재 우리나라의 대내외 경제여건상 소재·부품산업의 지역경쟁력을 분석해 보는 것이 매우 중요하고 필요한 연구라고 판단하고, 국내 소재·부품산업의 지역경쟁력을 분석해 보고자 하였다. 우리나라 소재·부품산업의 지역경쟁력을 분석하기 위해 5대 권역별로 다양한 산업분석을 통해 권역별 소재·부품산업의 지역경쟁력을 비교분석하였다. 다양한 산업분석을 실시해본 결과, 수도권은 산업규모는 아직 작지만 성장률이 높은 성장기 기업들이 많이 분포하고 있는 것으로 나타났다. 충청권은 산업규모도 크고 성장률도 높은 성숙기의 기업들이 많은 것으로 나타났고, 호남제주, 대경강원 및 동남권은 대체로 산업규모는 크지만 성장률이 떨어지고 있는 쇠퇴기 산업의 분포가 큰 것으로 파악되었다. 입지계수(LQ)와 노동의 상대적 효율성(RLQ)를 분석해본 결과, 지역 내 산업인력 재배치나 산업구조조정 문제는 산업의 생산성을 제고시키는 방향으로 산업정책이 수립·운용되어야 할 것을 제안하였으며, 지역의 경쟁요인(RCC)을 분석하여 권역별로 지역경쟁력을 확보한 소재·부품산업을 도출하였다. 소재·부품산업의 지역경쟁력을 분석한 본 연구는 현재 우리나라의 대내외 경제여건에서 향후 국내 지역별 소재·부품산업에 대한 지원 방향을 모색함에 있어 의미있는 시사점을 제공해 줄 수 있을 것으로 기대한다.

• Journal of Mechanical Science and Technology
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• 제20권12호
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• pp.2061-2078
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• 2006

The main purpose of this paper is to establish the high temperature structural integrity evaluating procedures for the next generation reactors, which are to be operated at over 500$^{\circ}C$ and for 60 years. To do this, comparison studies of the high temperature structural design codes and assessment procedures such as the ASME-NH (USA), RCC-MR (France), DDS (Japan), and R5 (UK) are carried out in view of the accumulated inelastic strain and the creep-fatigue damage evaluations. Also the application procedures of the ASME-NH rules with the actual thermal and structural analysis results are described in detail. To overcome the complexity and the engineering costs arising from a real application of the ASME-NH rules by hand, all the procedures established in this study such as the time-dependent primary stress limits, total accumulated creep ratcheting strain limits, and the creep-fatigue damage limits are computerized and implemented into the SIE ASME-NH program. Using this program, the selected high temperature structures subjected to two cycle types are evaluated and the parametric studies for the effects of the time step size, primary load, number of cycles, normal temperature for the creep damage evaluations and the effects of the load history on the creep ratcheting strain calculations are investigated.

• Asian-Australasian Journal of Animal Sciences
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• 제25권6호
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• pp.751-757
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• 2012

In order to develop specific genetic markers and determine the genetic diversity of Bangladeshi native cattle (Pabna, Red Chittagong) and exotic breeds (Sahiwal), randomly amplified polymorphic DNA (RAPD) analysis was performed using 12 primers. Genomic DNA was extracted from 20 cattle (local and exotic) blood samples and extracted DNA was observed by gel electrophoresis. Among the random primers three were matched and found to be polymorphic. Genetic relations between cattle's were determined by RAPD polymorphisms from a total of 66.67%. Statistical analysis of the data, estimating the genetic distances between cattle and sketching the cluster trees were estimated by using MEGA 5.05 software. Comparatively highest genetic distance (0.834) was found between RCC-82 and SL-623. The lowest genetic distance (0.031) was observed between M-1222 and M-5730. The genetic diversity of Red Chittagong and Sahiwal cattle was relatively higher for a prescribed breed. Adequate diversity in performance and adaptability can be exploited from the study results for actual improvement accruing to conservation and development of indigenous cattle resources.

• International Journal of Control, Automation, and Systems
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• 제6권5호
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• pp.731-739
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• 2008

The docking and recharging system for a mobile robot must guarantee the ability to perform its tasks continuously without human intervention. This paper proposes two docking mechanisms with localization error-compensation capability for an auto recharging system. The mechanisms use friction forces or magnetic forces between the docking parts of the robot and those of the docking station. It is a structure to improve the allowance ranges of lateral and directional docking offsets, in which the robot is able to dock into the docking station. In this paper, auto-recharging system and the features of the proposed mechanisms are verified with experimental results using simple homing method.