• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.23 no.1
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• pp.153-166
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• 2024

The digitalization of tasks for smart construction requires the smooth exchange of digital data among stakeholders to be effective, but there is a lack of digital data standardization and utilization methods. This paper proposes a digital construction information structure to transform information from road construction sites into digital formats. The study targets include significant tasks, such as work planning, scheduling, safety management, and quality control. The key to the construction information structure is separating construction information into objects and activities, defining unit works by combining these two types of information to ensure flexibility in representing and modifying construction information. The objects and activities have their respective hierarchical structures, which are defined flexibly to match the actual content. This structure achieves both efficiency and detail. The pilot structure was applied to highway construction projects and implemented digitally using general formats. This study enables the digitalization of road construction processes that closely resemble reality, accelerating the digital transformation of the civil engineering industry by developing a digital twin of the entire road construction lifecycle.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.136-138
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• 2003

디지털 방송이나 디지털 저장 매체 또는 인터넷을 통하여 제작, 전송되는 비디오의 내용을 좀더 효과적으로 브라우징 할 필요성이 대두되고 있다. 또한 비디오가 내포하고 있는 복잡한 정보들을 기술하고 그 구조를 표현하는 저작 도구들의 필요성이 날로 증대되고 있다. 이렇게 비디오의 내용은 브라우징하거나 복잡한 정보들을 기술하기 위해 트리 형태의 계층구조로 표현된다. 본 논문에서는 세그먼트 계층구조를 갖는 VTOC-트리를 정의하고 세그먼트 경계 검출 알고리즘을 통해 계층구조를 자동적으로 생성한 후, 이 구조를 사용자가 수작업을 통해 원하는 형태로 전환시키는 모델링 연산자를 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04b
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• pp.112-114
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• 2002

디지털 비디오의 급속한 사용으로 인해 비디오를 ;더 효과적으로 구조화하여 브라우징할 필요성이 대두되고 있다 비디오를 효과적으로 브라우징하기 위한 구조로 트리 형태의 계층구조가 주로 사용된다 트리 형태로 비디오를 계층구조화 시키기 위한 여러 가지 방법이 제안되었지만 비디오의 컨텐트가 너무 다양하기 때문에 이를 완전하게 자동화 한다는 것은 거의 불가능 하다. 본 논문에서는 내용기반 이미지 검색 기법을 이용한 클러스터링을 통해 3단계 계증구조를 자동적으로 생성한 후, 이 구조를 사용자가 수작업을 통해 원하는 형태로 전환시키는 기법을 제안한다. 또한 생성된 계층구조를 MPEG-7 메타데이타 표준으로 표현한다. 표현한다.

• Convergence Security Journal
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• v.18 no.3
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• pp.53-59
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• 2018

In this paper, we propose a hierarchical image classification scheme for efficient object image classification. In the non-hierarchical image classification, which classifies the existing whole images at one time, it showed that objects with relatively similar shapes are not recognized efficiently. Therefore, in this paper, we introduce the image classification method in the hierarchical structure which attempts to classify object images hierarchically. Also, we introduce to the efficient class structure and algorithms considering the scalability that can occur when a deep learning image classification is applied to an actual system. Such a scheme makes it possible to classify images with a higher degree of confidence in object images having relatively similar shapes.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.199-201
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• 2004

디지털 방송 환경의 메타데이타 서비스 중에서도 가장 혁신적인 것이 하이라이트(highlight)메타데이타 서비스이다. 하이라이트 메타데이타를 생성하기 위해서 시각율동을 이용한 샷경계 검출 알고리즘을 사용해 스포츠 경기의 하이라이트 시간구간을 결정하고, 하이라이트 표시기에서 하이라이트를 설명하는 간단한 주제어를 부가한다. 그리고 하이라이트 템플릿을 이용해 계층구조를 생성하고 하이라이트에 부가된 하이라이트 주제어에 따라 계층 구조의 적절한 위치에 삽입하고. 하이라이트 계층구조는 MPEG-7 표준 스키마에 따라 xml로 서술한다 하이라이트 메타데이타 서비스를 받는 시청자들은 매우 짧은 시간에 이미 방영된 스포츠 경기의 중요 장면들을 모두 볼 수 있다.

• Journal of Digital Contents Society
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• v.16 no.1
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• pp.33-41
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• 2015

Since bitmap indices are useful for OLAP queries over low-cardinality data columns, they are frequently used in data warehouses. In many data warehouse applications, the domain of a column tends to be hierarchical, such as categorical data and geographical data. When the domain of a column is hierarchical, hierarchical bitmap index is able to significantly improve the performance of queries with conditions on that column. This strategy, however, has a limitation in that when a large scale hierarchy is used, building a bimamp for each distinct node leads to a large space overhead. Thus, in this paper, we introduce the way to build hierarchical bitmap index on an attribute whose domain is organized into a large-scale hierarchy in space-constrained environments. Especially, in order to figure out space overhead of hierarchical bitmap indices, we propose the cut-selection strategy which divides the entire hierarchy into two exclusive regions.

• The KIPS Transactions:PartA
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• v.11A no.2
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• pp.175-180
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• 2004

Generally, as for the multimedia high quality contents, an illegality facsimile is possible without a damage of a quality. Also a distribution of contents duplicated illegality in an Internet is giving a great economic loss to digital contents provider. Therefore, a study for security and efficient distribution of digital contents is required. The most important issues in a design of digital contents distribution system are a user convenience, an execution speed and a security. In this study, we designed digital contents distribution system that used a web caching technology and an encryption/decryption technique on hierarchical structure. The proposed system was the digital contents distribution system that improved a security and execution speed, a convenience of a user. Also it verified performance superiority of a proposed system by an examination.

• Journal of KIISE:Computer Systems and Theory
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• v.31 no.9
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• pp.536-542
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• 2004

An architecture of direct digital frequency synthesizers (DDFS) is studied in this paper The Direct digital frequency synthesizers (DDFS) provide fast frequency switching with high spectral purity and are widely used in modern spread spectrum wireless communication systems. ROM-based DDFS uses a ROM lookup table to store the amplitude of a sine wave. In this paper, we suggest three new techniques to reduce the ROM size. One new technique uses more number of hierarchical levels in ROM structures. Another techniques use simple interpolation techniques combined with hierarchical ROM structures. A 12 bit sine wave is generated by using these techniques. Experimental results show that the new proposed techniques can reduce the required ROM size by up to 24%, when compared to that of a resent method[1].

• Journal of Digital Convergence
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• v.14 no.1
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• pp.121-129
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• 2016

The purpose of this study is to set a standard for sale prices of supplying apartment houses about decision factors in sale price of supplying apartment houses using Analytic Hierarchy Process. This is done by modeling decision factors in sale price of supplying apartment houses as hierarchy. According to the modeled hierarchy, the relative importance of supplying factors are determined using a survey of a group of real estate experts. In addition, through Analytic Hierarchy Process, the relative importance of phased sale prices of supplying apartment is analyzed in order to set a standard to estimate competitive sale prices of newly supplying apartment houses.

• Journal of Digital Policy
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• v.1 no.2
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• pp.53-59
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• 2022

In this paper, we proposed a method using sub-edge information extracted through a hierarchical structure in the process of generating super resolution based on a single image. In order to improve the quality of super resolution, it is necessary to clearly distinguish the shape of each area while clearly expressing the boundary area in the image. The proposed method assists edge information of the image in deep learning based super resolution method to create an improved super resolution result while maintaining the structural shape of the boundary region, which is an important factor determining the quality in the super resolution process. In addition to the group convolution structure for performing deep learning based super resolution, a separate hierarchical edge accumulation extraction process based on high-frequency band information for sub-edge extraction is proposed, and a method of using it as an auxiliary feature is proposed. Experimental results showed about 1% performance improvement in PSNR and SSIM compared to the existing super resolution.