• Steel and Composite Structures
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• 제31권1호
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• pp.1-12
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• 2019

Steel-concrete composite walls have been proposed and developed for applications in various types of structures. The double-skin profiled composite walls, as a natural development of composite flooring, provide structural and architectural merits. However, adequate intermediate fasteners between profiled steel plates and concrete core are required to fully mobilize the composite action and to improve the structural behavior of the wall. In this research, two new types of fasteners (i.e., threaded rods and vertical plates) were proposed and three specimens with different fastener types or fastener arrangements were tested under axial compression. The experimental results were evaluated in terms of failure modes, axial load versus axial displacement response, strength index, ductility index, and load-strain relationship. It was found that specimen with symmetrically arranged thread rods sustained more stable axial strain than that with staggered arranged threaded rods. Meanwhile, vertical plates are more suitable for practical use since they provide stronger confinement to profiled steel plate and effectively prevent the steel plate from early local buckling, which eventually enhance the composite action and increase the axial compressive capacity of the wall. The calculation methods were then proposed and good agreement was observed between the test results and the predicted results.

• Asian-Australasian Journal of Animal Sciences
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• 제19권6호
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• pp.872-876
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• 2006

The objective of this study was to evaluate Biocom (a protein source containing a high level of glutamine and alanyl-glutamine) as a replacement for glutamine (Gln) in nursery pig diets. Forty-two pigs (fourteen pigs per treatment) weaned at 28 d of age were used in a 28-d performance trial using three dietary treatments: control (no Gln), control supplemented with Gln or Biocom. The control diet was composed of corn, soybean meal, whey and fish meal. Individual body weight, pen feed disappearance and diarrhea were monitored. On d 0, 2, 7 and 14 postweaning, respectively, five pigs per treatment were selected and bled from the anterior vena cava to obtain five replicate samples of blood on each dietary treatment for determination of blood biochemical index. Dietary supplementation of Gln and Biocom did not influence performance, plasma Gln and total serum protein concentration (p>0.05). However, the addition of Gln and Biocom could prevent serum urea nitrogen and serum cortisol from increasing on d 2 postweaning (p<0.05). There were no significant differences (p>0.05) in any of the examined parameters between Gln- and Biocom-supplemented diets. In conclusion, dietary Gln did not influence the performance of early-weaned piglets owing to the complex diet containing whey, but could prevent the increase of serum urea and cortisol. Biocom could be used as a replacement for free pure Gln without any negative effect on early-weaned piglets.

• 경영정보학연구
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• 제11권3호
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• pp.63-82
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• 2009

기업간 B2B 전자상거래를 함에 있어, 판매기업은 판매대금회수의 안정성을 높이고 구매기업은 구매자금 확보를 위한 B2B 전자상거래 보증서비스가 사용되고 있다. 본 연구는 B2B 전자상거래 보증서비스의 지속적인 서비스 개선과 성과관리를 위한 KPI(Key Performance Index) 개발을 목표로 하고 있다. 그에 대한 사례로 'RFID기반 전자상거래 보증 중계 서비스 모델'에 대한 KPI를 도출하였다. KPI 개발을 위해 본 연구에서는 BSC(Balanced Score Card)를 응용한 IT BSC 모델을 적용하여 RFID 기반 전자상거래 보증 중계 서비스 모델의 KPI를 제시하였다. KPI 지표 도출은 크게 서비스 목표와 지표 연계, KPI Pool 구성단계, 지표 평가 및 지표선정 기준 마련, 최종 확정 및 적용의 4단계로 이루어 졌다. 본 연구를 통해 도출된 RFID기반 전자상거래 보증 중계 서비스 모델의 KPI는 1차적으로 서비스의 지속적인 유지관리 할 수 있는 기준을 제시하고, 이를 바탕으로 추후 서비스를 제공하는데 있어 서비스의 자체의 활성화 및 타 산업으로 서비스 확대를 위한 지침을 제공하고자 하였다.

• 디지털융복합연구
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• 제11권3호
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• pp.175-180
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• 2013

글로벌 마켓에서 경쟁하기 위하여 많은 기업들은 제품의 다양성을 증가시키고, 고객의 요구사항을 만족시키고, 리드타임을 줄이고, 비용을 줄이기 위하여 product family를 적용하고 있다. 성공적인 product family를 위한 핵심요인은 플랫폼을 도출하는 것이다. Product family를 설계할 때, 제품의 공통성과 차별성간의 절충을 해결하는 것이 중요하다. Product family내에서 공통성을 평가하기 위해서 공통성 지수를 개발하는 것이 필요하다. 공통성 지수는 공통 부품수, 비용, 제조 공정 등과 같은 서로 다른 변수들을 이용한다. 본 연구에서는 선행 연구된 공통성 지수를 벤치마킹하여 환경성을 고려한 새로운 product family 평가 지수인 그린 product family 지수(GPFI)를 개발하고자 한다. 기존에 개발된 공통성 지수들과 본 연구에서 개발된 GPFI와의 비교연구를 통하여 제안한 지수의 적합성과 효과성에 대하여 검증한다. 궁극적으로 본 연구에서 제안하는 새로운 개발한 그린 product family 지수는 환경친화적인 product family를 설계하고 개발하는 데 도움이 될 것이다.

• International Journal of Automotive Technology
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• 제8권3호
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• pp.351-359
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• 2007

In this study, a hierarchical switching control scheme based on robust control theory is proposed for tracking control of vehicle longitudinal acceleration in the presence of large uncertainties. A model set consisting of four multiplicative-uncertainty models is set up, and its corresponding controller set is designed by the LMI approach, which can ensures the robust performance of the closed loop system under arbitray switching. Based on the model set and the controller set, a switching index function by estimating the system gain of the uncertainties between the plant and the nominal model is designed to determine when and which controller should be switched into the closed loop. After theoretical analyses, experiments have also been carried out to validate the proposed control algorithm. The results show that the control system has good performance of robust stability and tracking ability in the presence of large uncertainties. The response time is smaller than 1.5s and the max tracking error is about $0.05\;m/S^2$ with the step input.

• Structural Engineering and Mechanics
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• 제87권4호
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• pp.297-304
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• 2023

Targeted introduction of explosion-resisting and energy-absorbing materials and optimization of explosion-resisting composite structural styles in underground engineering are the most important measures for modern engineering protection. They could also improve the survivability of underground engineering in wartime. In order to test explosion-resisting and energy-absorbing effects of high-performance equal-sized-aggregate (HPESA) concrete, the explosive loading tests were conducted on HPESA concrete composite plates by field simple explosion craters. Time-history curves of the explosion pressure at the interfaces were obtained under six conditions with different explosion ranges and different thicknesses of the HPESA concrete plate. Test results show that under the same explosion range, composite plate structures with different thicknesses of the HPESA concrete plate differ significantly in terms of the wave-absorbing ability. Under the three thicknesses in the tests, the wave-absorbing ability is enhanced with the growing thickness and the maximum pressure attenuation index reaches 83.4%. The energy attenuation coefficient of the HPESA concrete plate under different conditions was regressively fitted. The natural logarithm relations between the interlayer plate thickness and the energy attenuation coefficient under the two explosion ranges were attained.

• Current Optics and Photonics
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• 제4권1호
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• pp.1-8
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• 2020

We research a system of compressed-sensing computational ghost imaging (CSCGI) based on the intensity fluctuation brought by turbulence. In this system, we used the gamma-gamma intensity-fluctuation model, which is commonly used in transmission systems, to simulate the CSCGI system. By setting proper values of the parameters such as transmission distance, refractive-index structure parameter, and sampling rates, the peak signal-to-noise ratio (PSNR) performance and bit-error rate (BER) performance are obtained to evaluate the imaging quality, which provides a theoretical model to further research the ghost-imaging algorithm.

• Steel and Composite Structures
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• 제30권4호
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• pp.315-325
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• 2019

Double skin composite walls offer structural and economic merits over conventional reinforced concrete counterparts in terms of higher capacity, greater stiffness, and better ductility. This paper investigated the axial behavior of double skin composite walls with steel truss connectors. Full-scaled tests were conducted on three specimens with different height-to-thickness ratios. Test results were evaluated in terms of failure mode, load-axial displacement response, buckling loading, axial stiffness, ductility, strength index, load-lateral deflection, and strain distribution. The test data were compared with AISC 360 and Eurocode 4 and it was found that both codes provided conservative predictions on the safe side.

• Journal of information and communication convergence engineering
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• 제8권6호
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• pp.697-701
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• 2010

The numbers of digital video cameras are fast increased. Accordingly, digital video data management is becoming more important. Efficient storing method and fast browsing method still remains to be one of significant issue. In this paper, an optimized data storing process without losing information and an organized appearance features indexing method are proposed. Also, the data removing policy could be used to reduce large amount of space and it facilitates fast sequential search. The appearance features index constructs key information of moving objects to answer queries about what people are doing, particularly when, where and who they move. The evaluation results showed better performance in the transfer time and the saving in storage space.

• Asia Marketing Journal
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• 제18권4호
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• pp.51-76
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• 2017

Although much attention has been paid to customer satisfaction (CS) as a leading indicator of firm performance, few studies have investigated the role of CS distribution across individual customers. With 10 years of National Customer Satisfaction Index (NCSI) data in Korea, we examine the relationship between the variance of CS and key corporate performance measures such as revenue, profit, Tobin's q, and stock return. There are three main findings. First, we confirm the findings of previous studies that the average CS for a firm is related to the firm's economic performance. Second, we find a moderating effect of CS variance such that the relationship between the level of CS and firm performance is attenuated by the variance of CS. Finally, the variance of CS is found to directly affect firm performance over and above the CS level effect. More specifically, the variance decreases sales and stock return.