• Geomechanics and Engineering
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• 제38권3호
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• pp.231-247
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• 2024

The use of lime stabilization and geosynthetic reinforcement is a common approach to improve the performance of fine-grained soils in geotechnical applications. However, the impact of this combination on the soil-geosynthetic interaction remains unclear. This study addresses this gap by evaluating the interface efficiency and soil-geosynthetic interaction parameters of lime-stabilized clay (2%, 4%, 6%, and 8% lime content) reinforced with geotextile or geogrid using direct shear tests at various curing times (1, 7, 14, and 28 days). Additionally, machine learning algorithms (Support Vector Machine and Artificial Neural Network) were employed to predict soil shear strength. Findings revealed that lime stabilization significantly increased soil shear strength and interaction parameters, particularly at the optimal lime content (4%). Notably, stabilization improved the performance of soil-geogrid interfaces but had an adverse effect on soil-geotextile interfaces. Furthermore, machine learning algorithms effectively predicted soil shear strength, with sensitivity analysis highlighting lime percentage and geosynthetic type as the most significant influencing factors.

• 한국인터넷방송통신학회논문지
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• 제20권2호
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• pp.283-287
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• 2020

본 논문에서는 스마트폰 앱을 통하여 환풍기의 현재 상태 모니터링, on/off 기능 등 IoT를 지원하는 제어 시스템을 구현하였다. 기계학습(Machine Learning) 알고리즘 종류 중 하나인 지도학습에 포함되는 선형회귀(Linear Regression)를 적용하여 자율적으로 가정의 실내 온도, 습도의 데이터를 수집하여 상태를 진단하고 운전하면서 에너지를 최대한 효율적으로 사용하면서 사용자의 요구를 충족하도록 하였다. 구현한 시스템에서는 수동제어보다 같은 습도가 되는 데 필요한 환풍기의 작동 시간이 더 적다는 것으로 더 좋은 에너지 효율을 확인할 수 있었다. 이로 인해 사용자들은 기존의 환풍기보다 더욱 편리하고 효율적으로 사용할 수 있을 것으로 기대된다.

• Journal of the Korean Data and Information Science Society
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• 제10권2호
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• pp.473-483
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• 1999

Linux 운영체계를 기반으로 한 PC 시스템을 고가의 상용 워크스테이션에 필적하도록 성능을 극대화하고, 각 단위 Linux PC 시스템을 네트워크를 통해 CPU와 memory를 공유하게 하는 병렬가상장치(PVM: Parallel Virtual Machine) 방식의 소프트웨어를 사용하여 군집(clustering)함으로써 슈퍼 컴퓨터급 기능을 발휘하는 분산형 PC 시스템을 시험 구축하였다. 구축된 시스템의 성능을 PVM 방식의 병렬프로그램을 사용하여 벤치마킹 해본 결과, 병렬효율 (parallel efficiency)이 90%급에 접근함을 확인하였다.

• 한국염색가공학회지
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• 제12권1호
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• pp.1-11
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• 2000

This paper surveys the fabric weavability and machine efficiency in the various weaving looms such as Projectile, Rapiers, and Air-jet. Used projectile loom was Sulzer-PU, and FAST-R, THEMA-11E, and Picanol-GTX were used for Rapier looms, as the Air-Jet looms, Picanol PAT and OMNI types were used. Using these looms, 5 harness worsted satin fabrics were woven for surveying the fabric weavability and machine efficiency. Warp yam count of fabric is 1/40Nm, Sirofil, and filling is 1/30 Nm, worsted. End breaks of warp and filling directions for the various types of looms are measured and discussed with the mechanism of each loom. Warp and filling yam tensions are also measured and analysed with open width of shedding motion of each weaving machine. And various warp yam tensions with open width of shedding are measured and analysed according to the warp yam in various heald frame. These results fire also discussed with temples such as bar and ring. Warp yam tensions at the various positions on the fabric with various looms are measured and discussed with fabric mechanical properties such as tensile, bending, shear and surface.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1169-1171
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• 2001

Synchronous reluctance motors(SynRM) for the application such as an electric vehicle, compressor drives of air conditioner and machine tool spindle drives require a wide field-weakening speed range. In order to improve the efficiency performance in such applications, this paper has examined the loss and the efficiency characteristics of SynRM mainly in the field-weakening speed region over the base speed. The control strategy in order to offer a efficiency optimization operation is shown and the copper and iron losses driven the equivalent circuit model of the machine is minimized. The usefulness of the proposed efficiency optimization control is verified through the SynRM durve system.

• Asia pacific journal of information systems
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• 제10권1호
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• pp.19-35
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• 2000

Data Envelopment Analysis(DEA), a non-parametric productivity analysis tool, has become an accepted approach for assessing efficiency in a wide range of fields. Despite of its extensive applications, some features of DEA remain bothersome. DEA offers no guidelines to where relatively inefficient DMU(Decision Making Unit) improve since a reference set of an inefficient DMU consists of several efficient DMUs and it doesn't provide a stepwise path for improving the efficiency of each inefficient DMU considering the difference of efficiency. We aim to show that DEA can be used to evaluate the efficiency of System Integration Projects and suggest the methodology which overcomes the limitation of DEA through hybrid analysis utilizing DEA along with machine learning.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2006년도 춘계 국제학술대회 논문집
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• pp.77-88
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• 2006

Data Envelopment Analysis (DEA), a non-parametric productivity analysis tool, has become an accepted approach for assessing efficiency in a wide range of fields. Despite of its extensive applications, some features of DEA remain bothersome. DEA offers no guidelines to where relatively inefficient DMU(Decision Making Unit) improve since a reference set of an inefficient DMU consists of several efficient DMUs and it doesn't provide a stepwise path for improving the efficiency of each inefficient DMU considering the difference of efficiency. We aim to show that DEA can be used to evaluate the efficiency of System Integration Projects and suggest the methodology which overcomes the limitation of DEA through hybrid analysis utilizing DEA along with machine learning.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 추계종합학술대회
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• pp.816-819
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• 2005

자바 프로그램의 실행 환경인 자바가상기계에서는 거의 모든 바이트코드들이 메모리 상에서의 자료 이동을 필요로 한다. 자료 이동은 에너지 소비를 일으키므로 이것의 최소화는 JVM의 에너지 효율성 향상에 매우 중요하다. 특히 자바 반복문은 반복 회수에 비례하는 양만큼의 자료 이동을 요구하므로 JVM의 에너지 효율을 높이기 위해서는 무엇보다도 자바 반복문의 에너지 효율을 높이는 것이 중요하다. 본 논문에서는 자바 반복문을 바이트코드 수준에서 분석하여 에너지 효율성을 높일 수 있는 여러 방법들을 제안하였다.

• Journal of Biosystems Engineering
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• 제40권4호
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• pp.320-326
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• 2015

Purpose: Kimbugak is one of Korea's traditional snack foods made of laver. Mechanization of the manufacturing process is necessary to produce kimbugak in large quantities and standardize the products for industrialization. This study was conducted to develop a machine that can simultaneously accomplish the two processes of pasting and garnishing for manufacturing kimbugak, and test its performance. Methods: A pasting and garnishing machine was designed, and its target work efficiency was set at 720 sheets/h. The performance was tested based on the physical characteristics such as work efficiency, pasting uniformity, and garnishing uniformity. Results: With the developed technology, kimbugak could be produced up to a productive rate of 840 sheets/h on a single machine. The pasting uniformity ranged from 91.5% to 96.8%, and a garnishing uniformity of more than 90% could be obtained. Conclusions: It is expected that this approach to developing a machine with the functions of pasting and garnishing can contribute to the mechanization of the manufacturing process to produce Korean traditional foods including kimbugak in large quantities and standardize the products for industrialization.

• 한국가구학회지
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• 제20권3호
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• pp.239-246
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• 2009

The joinery technique, as one of manufacturing techniques for the wooden furniture, influences the production process, the economic efficiency, and the diversification of design. Especially, the usage of machine tools can determine how much the students can enhance their design expression capabilities during the practice class in furniture design courses of domestic universities, in accordance with whether to utilize the machine tools or not, and how much and frequent to use the machine tools. The study proved that the joinery techniques, based on the high-tech machine, has more efficiencies in the various aspects, including the easiness to manufacture the products, and the diversity of design than the joinery technique, based on the handcraft-only. As the ground of this, this study estimated the time to produce the wooden furniture by machine tools and by handcraft-only, each. Also, this study show the comparison of the features of three different joinery techniques. On the basis of this comparison, this study made the conclusion that the machine-based joinery technique, which is used in the practice class, is the best method to bring the best results in manufacturing the wooden furniture.