• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.8 no.1
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• pp.51-56
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• 1990

Recently, Electronic Distance Meter(EDM) is widely used for the traverse surveying and trilateration net. In this study, the closed traverse network is precisely adjusted by simultaneous adjustment of the observed angle and distance, using the Electronic Total Stations (Set 3). And also, it is examined that each kind accidental errors appear observed angles according to the observed distance and the number of repeating angle. In addition to the result, of checking between the simultaneous adjustment, the compass rule and transit rule, simultaneous adjustment in combination of the observed angle and distance is more accurate and effective than other adjustment.

• Journal of KIISE:Databases
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• v.35 no.3
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• pp.257-271
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• 2008

Wireless broadcast environments has character that a number of mobile client can receive data streaming from central server no matter how they are so many. Because it is asymmetric bandwidth in that uplink and downlink bandwidth are different. This advantage helps wireless broadcast environments is used in many applications. These applications work almost read operation and need control concurrency using transaction unit. Previous concurrency control scheme in single channel is not adapted in multi channel environments because consistency of data are broken when a mobile client tunes in a broadcast cycle in a channel and then move into another channel and listen to different broadcast cycle with already accessed broadcast cycle. In this paper, we propose concurrency control for read-only mobile transactions in multiple wireless broadcast channel. First of all, we adapt index and data dedicated channel and propose LBCPC(Longest Broadcast Cycle Per Channel) as new unit of consistency. In index dedicated channel, it is repeatedly broadcasted data in same BCPC(Broadcast Cycle Per Channel) until LBCPC. And mobile transaction executes validation using control information every LBCPC. As a result, consistency of data is kept and average response time is shorter than one in single channel because waiting time for restart reduces. And as control information is broadcasted more frequently than in single channel, it is guaranteed currency about data accessed by transaction. Finally, according to the simulation result, we verify performance of our scheme in multi channel as comparing average response time with single channel.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06a
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• pp.302-304
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• 2012

최근 다양한 차량용 전자장치들이 등장함에 따라 이들을 제어하기 위한 소프트웨어의 중요성이 크게 부각되고 있다. 특히 차량용 인포테인먼트 시스템에 대한 요구사항이 급격하게 증가하고 있으며, 이를 효율적으로 수용하기 위한 소프트웨어 플랫폼의 개발이 활발히 진행되고 있다. 이러한 소프트웨어 플랫폼의 표준화를 위한 움직임이 본격적으로 진행되고 있으며, 다양한 소프트웨어 플랫폼에 대한 고려도 동시에 이루어지고 있다. 차량용 인포테인먼트 시스템에 가상화 및 파티셔닝 기술을 도입하면 각 응용프로그램의 실시간 요구사항을 만족시킴과 동시에 이미 개발된 다양한 소프트웨어 플랫폼을 지원할 수 있다. 하지만 아직까지 차량용 인포테인먼트 시스템을 위하여 호스트 운영체제에서 동작하는 비가상화 파티션과 가상화 기술을 이용한 가상화 파티션을 동시에 지원하기 위한 연구는 존재하지 않는다. 본 논문에서는 리눅스 운영체제에서 동작하는 비가상화 파티션과 가상화 기술을 이용한 가상화 파티션을 동시에 지원하기 위한 스케줄링 방법을 제안하고 개발된 시스템의 유용성을 보이기 위하여 가상화 파티션 및 비가상화 파티션을 동시에 사용하는 차량용 인포테인먼트 시스템의 사례연구를 보인다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.353-355
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• 2003

본 논문은 유전자 알고리즘의 다양성(diversity)을 유지하면서 동시에 수렴(convergence) 속도를 향상시키기 위한 새로운 선택기법을 제안한다. 이를 위해 적합도가 높은 염색체를 다음 세대로 전달하면서 동시에 적합도가 낮은 염색체에 대해서도 일정 수준 전달되게 하였다. 또한 기존의 설러 선택기법 중 가장 일반적으로 사용되는 토너먼트 선택 기법의 문제점을 고찰하고, 제안 알고리즘의 최적도 밀 수렴속도를 모의 실험을 통해 비교 및 분석한다. 실험 결과로부터 제안 알고리즘은 기존의 토너먼트 선택기법에 비해 우수함을 확인하였다.

• Journal of KIISE:Databases
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• v.37 no.3
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• pp.171-175
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• 2010

This paper analyzes the tag data inconsistency problem caused by incomplete execution of the tag access operation to the RFID tag's memory and proposes a protocol to control consistent tag data accesses with finalizing the incomplete operation. Passive RFID tag cannot guarantee complete execution of the tag access operations because of uncertainty and unexpected disconnection of RF communications. This leads to the tag data inconsistency problem. To handle this, we propose a concurrency control protocol which defines incomplete tag operations as continuous queries and monitors the tags're-observation continuously. The protocol finalizes the incomplete operation when the tag is re-observed while it blocks inconsistent data accesses from other operations. We justify the proposed protocol by analyzing the completeness and consistency. The experiments show that the protocol shows better performance than the traditional lock-based concurrency control protocol.

• The Korean Journal of Applied Statistics
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• v.27 no.7
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• pp.1197-1205
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• 2014

Typical clinical dose development studies consist of the comparison of several doses of a drug with a placebo. The primary interest is to find therapeutic window that satisfying both efficacy and safety. In this paper, we propose nonparametric method for identifying effective and safe doses in linear placement using score function. The Monte Carlo simulation is adapted to estimate the power and the family-wise error rate(FWE) of proposed procedure are compared with previous methods.

• Journal of Soil and Groundwater Environment
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• v.8 no.3
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• pp.30-36
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• 2003

The effect of humic acid on the simultaneous removal of nitrate and phosphate was investigated in a micellar-enhanced ultrafiltration (MEUF). At the low molar ratio of cetylpyridinium chloride (CPC) to contaminants, the removal of nitrate was lower to 50％ by 100 ppm of humic acid due to the competition for binding on micelles. At the molar ratio higher than 3, however, the removal of nitrate was over 80％. Phosphate was removed over 80% at the molar ratio higher than 1. The CPC and humic acid were rejected over 99 ％ by UF membrane. The flux did not decrease by 100 ppm of humic acid but rather slightly increased since the humic acid adsorbed on the membrane made the membrane more hydrophilic. As a result, humic acid did not diminish the performance of MEUF in the simultaneous removal of nitrate and phosphate.

• Agrochemical news magazine
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• v.21 no.1 s.154
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• pp.46-49
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• 2000

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.313-316
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• 1998

본 논문은 한국어 단어의 의미 영역 정보를 저장하기 위한 시소러스를 설게하고 이를 구축하기 위한 시스템을 설계하였다. 기존에 TOP_DOWN이나 BOTTOM_UP 방식을 이용하는 경우 각각 비 객관성과 작업 속도의 문제와 비구조성, 비일관성의 문제를 안고 있어 이를 혼합하여 어의문을 이용하여 객관성을 유지하면서도 기본모델을 이용하여 비구조성과 비일관성의 문제를 해결하고 있다. 또한 그 동안 필요성이 증가되었으나 작업을 하지 못했던 가장 큰 이유인 단어의 방대성으로 기인한 작업속도의 문제해결하기 위하여 C/S 모델을 적용하여 다수의 입력자들에 의해 동시 입력을 가능케 함으로써 작업 속도의 향상을 이루었다.

• Journal of the Korean Society for information Management
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• v.29 no.2
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• pp.193-204
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• 2012

The characteristics of citation and centrality measures in citation networks can be identified using multiple linear regression analyses. In this study, we examine the relationships between bibliometric indices and centrality measures in an article-level co-citation network to determine whether the linear model is the best fitting model and to suggest the necessity of data transformation in the analysis. 703 highly cited articles in Physics published in 2004 were sampled, and four indicators were developed as variables in this study: citation counts, degree centrality, closeness centrality, and betweenness centrality in the co-citation network. As a result, the relationship pattern between citation counts and degree centrality in a co-citation network fits a non-linear rather than linear model. Also, the relationship between degree and closeness centrality measures, or that between degree and betweenness centrality measures, can be better explained by non-linear models than by a linear model. It may be controversial, however, to choose non-linear models as the best-fitting for the relationship between closeness and betweenness centrality measures, as this result implies that data transformation may be a necessary step for inferential statistics.