• 지능정보연구
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• 제21권3호
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• pp.101-116
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• 2015

많은 기관들이 데이터에 기반을 둔 의사결정을 수행해 왔으며, 특히 수치자료를 비롯한 정형 데이터가 이러한 목적으로 널리 활용되어 왔다. 하지만 최근에는 스마트기기와 소셜미디어의 발달로 인해 다양한 형태를 가진 방대한 양의 정보가 생성, 공유, 저장되면서, 전통적인 정형 데이터 기반 의사결정으로부터 비정형 빅데이터 기반 의사결정으로 관심의 전환이 이루어지고 있다. 데이터 기반 의사결정의 대표적 분야인 추천시스템 분야에서도 성능 향상을 위해 비정형 데이터를 활용해야 한다는 필요성이 최근 꾸준히 제기되고 있다. 특히 사용자의 성향이나 선호도는 고객의 니즈와 직결되기 때문에, 비정형 데이터 분석을 통해 사용자의 성향을 파악하고 이를 통해 상품 추천 및 구매 예측의 정확도를 향상시키기 위한 노력이 매우 시급하게 이루어질 필요가 있다. 따라서 본 연구에서는 사용자의 성향을 측정하여 재구매 예측 정확도, 특히 카테고리별 재구매 예측 정확도를 높임으로써, 궁극적으로 추천시스템의 성능을 향상시킬 수 있는 방안을 제시한다. 구체적으로는 사용자의 일상적인 인터넷 사용 기록을 분석하여 고객이 조회하는 뉴스 기사의 이슈를 식별하고 다양한 이슈에 대한 고객의 관심을 계량화한 후, 이를 활용하여 고객의 카테고리별 재구매 여부를 예측하는 모델을 제안하고자 한다. 실제 웹 트랜잭션으로부터 도출된 인터넷 뉴스 조회 기록 및 쇼핑몰 구매 기록을 대상으로 실험을 수행한 결과, 고객의 과거 구매이력만을 활용한 카테고리 재구매 예측 모형에 비해 본 연구에서 제안한 모형, 즉 고객의 과거 구매이력과 관심 이슈를 모두 활용한 예측 모형의 정확도가 다소 우수한 것으로 나타났다.

• 한국환경과학회지
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• 제21권12호
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• pp.1449-1454
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• 2012

The ion selective microelectrodes (ISME) have been applied to observe the continuous profiles of NO3-N and NH4-N in bulk solutions or biofilms. In order to evaluate the performance and applicability of ion concentration measuring system, the characteristics, such as slope of calibration curve, detection limit and potentiometric selectivity coefficient were investigated. The slopes of calibration curve showed high degree of correspondence for each target ion concentrations. And the detection limits of nitrate and ammonia ion selective microelectrode were 10-4.7 M and 10-4.4 M, respectively. These ion selective microelectrodes were proved that their own performance could be maintained for 16 days after making. NO3-N and NH4-N selective microelectrodes were also adapted to detect the continuous ion profiles of cilia media packed MLE (Modified Ludzack-Ettinger) process. And the monitored nitrate and ammonia ion profiles with the ion selective microelectrode were stable and well corresponded to the results with conventional ion chromatograph. However, the electric potential was unstable until 8 hr because of the unknown noise. The tip shape and performance of the ion selective microelectrode was stably kept over 2 days continuous monitoring.

• KIEAE Journal
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• 제17권5호
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• pp.87-94
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• 2017

Purpose: Prefabricated modular space such as a container construction has recently been interested unlike the conventional construction method, and their scale have expanded from small buildings such as cafes, houses and pensions to shopping centers, complex cultural spaces where shows and exhibitions are possible doing. In this way, the container is in the spotlight as an advantage such as mobility, flexibility, correspondence, economic efficiency, recyclability and so on. However, there are no specific guidelines and standard design methods in aspects of structural calculation, functional insulation and environmental configuration. Therefore, as the first step to resolve these problems, this study has focused on the field of environmental performance of container construction, presented appropriate guidelines and searched ways to improve performances. Method: For this study, seven types of the modular building were chosen and compared, and their energy performances have been analyzed using a proven simulation tool. Essential methodology and terminology were examined to estimate and judge their efficiency. Result: In conclusion, energy performances depend on specific configuration of combined unit spaces, and design guidelines cold be set up for promoting their use in the practical field.

• 한국건설관리학회논문집
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• 제10권4호
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• pp.119-128
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• 2009

건설R&D사업은 연구특성에 따라 서로 다른 성과를 나타낸다. 하지만 현재 평가방식은 연구특성보다는 사업구분에 따라 평가를 실시하고 있다. 성과를 측정하고 평가하는 가장 큰 이유는 단기적으로 평가대상 간의 우열을 가리는 기능 때문이지만 장기적으로는 향후 추진되는 건설 R&D사업의 성과를 에측하고 보다 향상된 성과를 얻을 수 있기 때문이다. 따라서 본 논문은 산출물 중심의 성과측정지표 도출을 하고 정량적인 측정방법을 개발하여 건설 R&D사업을 정량적으로 측정한다. 측정된 정량적인 수치는 분산분석을 통해 연구특성에 따른 성과발현의 차이를 확인하고 대응일치분석을 통해 연구특성과의 관계를 분석하는데 활용된다. 본 연구의 목적은 기존 건설 R&D사업의 획일적인 성과평가에 대한 문제점을 정량적인 성과측정을 통해 검증하는데 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권2호
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• pp.728-741
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• 2015

Stereo vision has become an important technical issue in the field of 3D imaging, machine vision, robotics, image analysis, and so on. The depth map extraction from stereo video is a key technology of stereoscopic 3D video requiring stereo correspondence algorithms. This is the matching process of the similarity measure for each disparity value, followed by an aggregation and optimization step. Since it requires a lot of computational power, there are significant speed-performance advantages when exploiting parallel processing available on processors. In this situation, multi-core CPU may allow many parallel programming technologies to be realized in users computing devices. This paper proposes parallel implementations for calculating disparity map using a shared memory programming and exploiting the streaming SIMD extension technology. By doing so, we can take advantage both of the hardware and software features of multi-core processor. For the performance evaluation, we implemented a parallel SAD algorithm with OpenMP and SSE2. Their processing speeds are compared with non parallel version on stereoscopic streaming video. The experimental results show that both technologies have a significant effect on the performance and achieve great improvements on processing speed.

• 대한조선학회논문집
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• 제47권3호
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• pp.350-358
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• 2010

The present paper deals with the comparative study of resistance performance with refrigerated ice and synthetic ice according to the variation of hull form characteristics. The resistance test has been conducted in pack ice condition in each concentration condition. Stem angle has been chosen as main parameters for the variation of hull form characteristics. The correlation of performance between with the refrigerated ice and with the synthetic ice has been shown according to the variation for stem angles. The present study show the possibility of ice test in general towing tank with synthetic ice for the time-consuming research such as hull form optimization although that is confined in pack ice condition. The more parametric study for the properties of synthetic ice is expected to be conducted to have more close correspondence for the test results of refrigerated ice in near future.

• 한국IT서비스학회지
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• 제12권1호
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• pp.15-32
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• 2013

The concrete information technology (IT) has affected ways for supporting agricultural products. However, studies relating IT to agriculture in a broader sense have not been prevalent. The objective of this study is to improve agencies' effectiveness and performance in the use and application of IT through understanding the organizational fit and misfit. This research applied a multi-contingency view to Korean IT supporting agricultural promotion agencies and it evaluated the competitiveness of these agencies with reference to the correspondence of factors (Goal, Strategy, Environment, Knowledge Exchange, Task Design, and Information System) affecting their performance with organizational goals. The results reveal that organizations with good performance show better organizational fit with their organizational goal. This study contributes to the ways of efficient IT management in agricultural organizations in Korea.

• 전기학회논문지
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• 제63권11호
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• pp.1551-1558
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• 2014

We propose a multi-rate sensor fusion of vision and radar using Kalman filter to solve problems of asynchronized and multi-rate sampling periods in object vehicle tracking. A model based prediction of object vehicles is performed with a decentralized multi-rate Kalman filter for each sensor (vision and radar sensors.) To obtain the improvement in the performance of position prediction, different weighting is applied to each sensor's predicted object position from the multi-rate Kalman filter. The proposed method can provide estimated position of the object vehicles at every sampling time of ECU. The Mahalanobis distance is used to make correspondence among the measured and predicted objects. Through the experimental results, we validate that the post-processed fusion data give us improved tracking performance. The proposed method obtained two times improvement in the object tracking performance compared to single sensor method (camera or radar sensor) in the view point of roots mean square error.

• 한국재료학회지
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• 제11권9호
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• pp.781-785
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• 2001

The thermal behavior of Flow Pattern Defect (FPD) and Large Pit (LP) in Czochralski Silicon crystal was investigated by applying high temperature annealing ($\geq$$1100^{\circ}C$) and non-agitated Secco etching. For evaluation of the effect of LP upon device performance/yield, commercial DRAM and ASIC devices were fabricated. The results indicated that high temperature annealing generates LPs whereas it decreases FPD density drastically. However, the origins of FPD and LP seemed to be quite different by not showing any correspondence to their density and the location of LP generation and FPD extinction. By not showing any difference between the performance/yield of devices whose design rule is larger than 0.35 $\mu\textrm{m}$, LP seemed not to have detrimental effects on the performance/yield.

• 한국정보통신학회논문지
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• 제22권5호
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• pp.818-828
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• 2018

현재 네트워크 정보보호를 위하여 다양한 보안 시스템들이 개발되어 활용되고 있다. 보안 솔루션을 도입하는 것만으로 보안상의 위험을 상당수 방지할 수 있지만, 보안 솔루션은 그 목적과 기능에 따라 적절한 형태로 사용되어야 충분한 가치가 발휘될 수 있다. 정보보호시스템에 많이 사용되는 보안 솔루션으로는 방화벽, IDS, IPS 등이 있다. 그러나 다양한 정보보호시스템을 도입하고 있더라도 이를 우회하여 공격하는 기법은 항상 존재한다. 본 논문에서는 정보보호시스템에서 우회공격 기법에 대한 대응 방안과 우회 공격 기법을 훈련에 적용할 수 있는 효과적인 훈련 시나리오를 제안한다. 제안한 대응 훈련 시나리오의 유효성을 검증하기 위해 GNS3 네트워크 시뮬레이터를 사용하였으며, VirtualBox를 이용하여 가상 운영체제를 구축하였다. 제안하는 네트워크 정보보호시스템을 우회하는 공격에 대한 대응훈련 시나리오는 실제 공격에 대응하는데 매우 효과적으로 활용될 수 있다.