• Proceedings of the KSRS Conference
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• v.1
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• pp.406-408
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• 2006

Various geological thematic maps such as grain size or ground water level maps have been generated by interpolating sparsely sampled ground survey data. When there are sampled data at a limited number of locations, to use secondary information which is correlated to primary variable can help us to estimate the attribute values of the primary variable at unsampled locations. This paper applies two multivariate geostatistical algorithms to integrate remote sensing imagery with sparsely sampled ground survey data for spatial estimation of grain size: simple kriging with local means and kriging with an external drift. High-resolution IKONOS imagery which is well correlated with the grain size is used as secondary information. The algorithms are evaluated from a case study with grain size observations measured at 53 locations in the Baramarae beach of Anmyeondo, Korea. Cross validation based on a one-leave-out approach is used to compare the estimation performance of the two multivariate geostatistical algorithms with that of traditional ordinary kriging.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.22-25
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• 2003

It is usually difficult for a single user to have all the essential knowledge on various Rapid Prototyping processes and techniques. It is therefore necessary to capture knowledge and experience of users of expert level into a decision-support system which provides quicker and more interactive way to select proper RP process and/or machine. rather than reading reports on benchmarking studies and comparing tables and graphs. In this paper two algorithms are presented, which may be used in such a decision-support system. together with its applications. The one is an extended PRES(Project Evaluation and Selection) algorithm which applies weighting factors of each attribute. The other is a LCE(Linear Confidence Equation) algorithm which is proposed to apply user's input requirements as well as weighting factors.

• Asia pacific journal of information systems
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• v.12 no.1
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• pp.1-16
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• 2002

Most of searching systems used by shopping-mall provide too much information for user requirements or fail to provide appropriate items reflecting customer's preference. This paper aims to design and implement the product searching systems based on customer preference which will enable efficient product selection in the internet shopping-mall. The proposed system consists of user/provider interface, searching and model agent, data management system, and model management system. Especially, we construct the searching pattern database to support fast search using association mining method. And this system includes the customer-oriented decision model which shows the highly preferred products. Input weight value per attribute and preference level should be needed to compute priority grade of preference.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.877-880
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• 2003

In a competitive and globalized business environment, the need for the green products becomes stronger. To meet these trends, the environmental assessment besides delivery, cost and quality of products should be considered as an important factor in new product development phase. In this paper. a knowledge-based approximate life cycle assessment system (KALCAS) for the collaborative design environment is developed to assess the environmental impacts in context of product concept development. It aims at improving the environmental efficiency of the product using artificial neural networks consisting of high-level product attributes and LCA results. The overall framework of the collaborative environment including KALCAS is proposed. This architecture uses the CO environment to allow users on a wide variety of platforms to access the product data and other related information. It enables us to trade-off the evaluation results between the objectives of the product development including the approximate environmental assessment in the collaborative design environment.

• Journal of Industrial Technology
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• v.16
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• pp.247-256
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• 1996

The multilevel grid file(MLGF) is a dynamic multidimensional file organization supporting multi-attribute accesses efficiently. The paper proposes new method for batch-constructing MLGFs. Our method consists of two phases. The first phase begins by relocating all the objects in order that logically adjacent objects in multidimensional domain space are clustered in one dimensional physical space. For this, our method employs the Z-ordering scheme, which effectively maps multidimensional space into one dimensional space preserving proximity. The second phase paginates the relocated objects and creates leaf level directory entries, each of which corresponds to a object page. Simultaneously, it performs same actions on the directory entries recursively in a bottom-up fashion until the root directory fits in a page. For performance evaluation, we analyze our method in terms of the number of page accesses. The result shows the optimality of our method.

• Journal of IKEEE
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• v.22 no.3
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• pp.862-865
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• 2018

The proposed scheme minimizes the Idle time under the residual energy of the sensor node to adjust the Sleep-Wakeup period and minimize unnecessary energy consumption. It is The proposed scheme minimizes the Idle time under the residual energy of the sensor node to adjust the Sleep-Wakeup period and minimize unnecessary energy consumption. It is an important process to control the Application Packet Framework including the PHY and the MAC layer at each node's Idle time with the Idle time mechanism state before the proposed function is executed. The Current Control Level of the Report Attribute is fixed at one sending / receiving node where power consumption can occur, by changing Sleep-Wakeup time, the low power consumption efficiency was improved while satisfying the transmission requirement of the given delay time constraint.

• Journal of IKEEE
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• v.22 no.3
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• pp.878-881
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• 2018

In this paper, experiments through performance evaluation under real operation environment were conducted. Transceiver and microcontroller shows the characteristics for the amount of current consumption and software protocol was optimized by controlling the time of Report Attribute and electric current level. To reduce current consumption when using battery, with designing transmission of the same amount of data as soon as possible, power consumption efficiency was enhanced.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2004.11a
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• pp.147-152
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• 2004

With the life style changing and the income level improving in our society, the composition of apartment residents and the preference are diversifying. For that reason, various residential plans are desired. However in bearing wall system the existing apartments have a clear attribute of a fixed system, consequently, they have a difficulty in being adapted to the social requirement. In this research, 1 would like to put a variable apartment to practical use in which with a suitable structure system applied to a variable apartment considered as remodeling system various residential requirements are accepted and the change of the family life cycle and moreover, effective and systematic remodeling are accomplished.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06c
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• pp.397-401
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• 2008

추천시스템은 일반적으로 협동적 필터링이라는 정보 필터링 기술을 사용한다. 협동적 필터링은 유사한 성향을 갖는 다른 고객들이 상품에 대해서 매긴 평가에 기반하기 때문에 고객에게 가장 적합한 유사 이웃들을 적절히 선정해 내는 것이 추천시스템의 예측의 질 향상을 위해서 필요하다. 본 논문에서는 다중 속성 정보를 기반으로 한 다단계 클러스터링을 통한 이웃선정 방법을 제안한다. 이 방법은 대규모 데이터 셋에서 탐색 공간을 줄이기 위해 클러스터링을 수행하여 적절한 이웃 고객들의 집합을 검색하여 추출한다. 이 때, 다중 속성 정보에 따라 단계적으로 클러스터링을 수행함으로써 보다 정제된 고객 집합을 구성할 수 있도록 한다. 본 논문에서는 고객 선호도와 위치 정보 및 아이템의 선호도와 위치 정보를 대표적인 속성 정보로 사용함으로써 모바일 환경에서 보다 정확한 추천이 이루어질 수 있도록 한다.

• Journal of the Korea Safety Management & Science
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• v.8 no.1
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• pp.165-179
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• 2006

Flextime system labor problem appeared by social issue going through a late 97s economic crisis. The most important thing among gravity is that act for factor who do to magnify gulf between rich and poor because do so that may polarize labor market at central part and neighborhood and makes preservation of society integration hardly social economy enemy of flextime system worker's spread. Furthermore, new economy surrounding has attribute that deepen uncertainty social bipolarization according as order by 21th century information-oriented society, globalization, knowledge base economy. Therefore, role of the country that control spread of flextime system in fixed level is more important first of all and application of employment insurance may do that have important meaning and social deliquescence.