• Information and Communications Magazine
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• v.17 no.10
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• pp.129-139
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• 2000

HTML로 표현된 양식은 데이터 모델을 포함하고 있지 않기 때문에 종이 양식과 같은 전자상거래 레코드를 구성하기 어렵다. XML로 양식을 표현하기 위한 노력은 XFDL이 대표적이다. 전자상거래 언어로서 XFDL의 가치는 데이터, 표현, 계산규칙, 의미 등에 대한 정보를 단일한 XML 문서에 통합하는 능력이 있다. XFDL은 고품질의 배치(Layout), 문서화(Documentation) 지원, 통합 계산, 입력 검증, 복수의 중첩되는 디지털 서명, 감사가 가능한 거래 레크드 등을 지원한다. 그러나, 이러한 특징을 갖는 XFDL은 내용과 표현을 분리하고자 하는 W3C의 정책과는 괴리가 있다. XForms는 HTML 양식의 한계점을 개선하기 위해서 W3C에서 활발히 추진되고 있는 XML기반의 차세대 양식이다. 핵심 아이디어는 사용자 인터페이스와 표현을 데이터 모델과 논리로부터 분리시켜서, 하나의 폼을 이동단말, 텔레비전, PC등 다양한 용도로 사용할 수 있도록 지원한다는 점이다. 이 논문에서는 차세대의 양식 표준으로 예상되는 XForms를 중심으로 기업간의 양식 처리를 위한 방안에 대하여 논한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.12
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• pp.2701-2706
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• 2009

There are Impulse noise and AWGN in a general image processing. Various methods have been proposed to remove these noises. Well-known filters are Mean, Min-max and Median filter and these show different characteristics depending on the noises. When Impulse noise and AWGN are in superposition environment, single filter doesn't remove noises well. Therefore in this paper, we suggested a switching filter using a probability of noise to restore images in this environment. And we compared a filter with conventional method through simulations.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.239-242
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• 2001

일반적인 응용 프로그램에서 병렬성이 많은 구조는 루프 구조이며, 루프를 병렬로 처리하기 위해 동기화가 필요하다. 본 논문에서는 다중첨자를 갖는 1차원 배열의 루프의 병렬화를 위해 다수 개의 동일한 종속값을 이용하여 종속함수를 생성하고 이를 이용하여 종속관계가 성립하지 않는 비종속 구간(Non-dependence part)을 구한다. 그리고 동일한 값을 가지는 복수개의 종속값 간의 동기화는 외부루프 분할 기법을 이용하여 간소화 한 후 단일 첨자를 갖는 루프에 동기화를 수행하는 기법을 제시한다.

• Journal of Internet Computing and Services
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• v.1 no.2
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• pp.11-18
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• 2000

In this paper we present a new extensible model based upon the concept of subtransactions in real-time transaction systems. The nested transaction model originally proposed by J. Moss is extended for real-time uniprocessor transaction systems by adding explicit timing constraints. Based upon the model, an integrated concurrency control and scheduling algorithm is developed, that not only guarantees timing constraints of a set of real-time transactions but also maintains consistency of the database. The algorithm is based on the priority ceiling protocol of Sha et al. We prove that the Real-Time Nested Priority Ceiling Protocol prevents unbounded blocking and deadlock, and maintains the serializability of a set of real-time transactions. We use the upper bound on the duration that a transaction can be blocked to show that it is possible to analyze the schedulability of a transaction set using rate-monotonic priority assignment. This work is viewed as a step toward multiprocessor and distributed real-time nested transaction systems. Also, it is possible to be extended to include the real-time multimedia transactions in the emerging web-based database application areas.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.8
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• pp.27-33
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• 2007

A novel priming discharge technique in which the ramp shaped priming pulse is superposed on the sustain period so that the entire plasma display panel (PDP) is discharged at the same time with a single drive circuit is proposed. From the experimental results, it is ascertained that the priming discharge is ignited only in a pixel in which sustain discharge does not occur and it has been understood that the priming pulse hardly influences the sustain discharge. Moreover, high-speed driving with address pulse widths of 0.7[${\mu}s$] was achieved and a wide address voltage margin of 40[V] was obtained by using the drive method applied the proposed priming discharge technique. In these results, full-HDTV PDP with 1080 horizontal scanning lines can be driven without decreasing the brightness and the possibility of the commercializing is also high because this technology is designed for using the commercialized driver IC.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.4
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• pp.39-46
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• 2013

Cooperative spectrum sensing can improve sensing reliability, compared with single node spectrum sensing. In addition, Eigenvalue-based spectrum sensing has also drawn a great attention due to its performance improvement over the energy detection method in which the more smoothing factor, the better performance is achieved. However, the more smoothing factor in Eignevalue-based spectrum sensing requires the more sensing time. Furthermore, more reporting time in cooperative sensing will be required as the number of nodes increases. Subsequently, we in this paper propose an Eigenvalue and superposition-based spectrum sensing where the reporting time is utilized so as to increase the number of smoothing factors for autocorrelation calculation. Simulation result demonstrates that the proposed scheme has better detection probability in both local as well as global detection while requiring less sensing time as compared with conventional Eigenvalue-based detection scheme.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1661-1667
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• 2009

Post-cure characteristics of a silicone rubber material which is widely used for a LCD lamp holder were investigated using thermogravimetric analysis (TGA). Research was especially focussed on searching for the optimum post-cure conditions in relation to the practical operation environments. The results showed that incipient volatile temperature(Ti) during the process was considered as the most important factor and, thereby, post-curing for 2hrs at $250^{\circ}C$seemed to be a reasonable condition in the practical view-point. Arrhenius plot of shift factors which were empirically determined from the time-temperature-superposition-principle showed good linearity, exhibiting the post-cure mechanism might be proceeded through single mechanism with activation energy of 108.25kJ/mol.

• Journal of the Korea institute for structural maintenance and inspection
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• v.19 no.5
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• pp.30-37
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• 2015

The estimation of system damping parameter of the response signal with lower natural frequency and higher damping parameter from free vibration is affected by the wavelet center frequency. This study discusses these considerations in the context of the wavelet's multi-resolution character and includes guidelines for selection of wavelet center frequency. The experiment with H-Beam and numerical examples with respect to three cases (i)single mode, (ii)separated modes and (iii)close modes demonstrate the validity of method to improve the accuracy of the estimated damping parameter. The localization of the corresponding scale for the total scales is determined by the natural frequency of the analysing mode and is affected by the wavelet center frequency. Thus, the reliability for the accuracy of the estimated damping parameter can be improved by the corresponding scale of the natural frequency for the analysing mode is localized at the half of the total scales.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.5 no.3
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• pp.27-36
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• 2015

Electronic cultural atlases based on a variety of topics have been studied because of recently increased interest about them. Existing cultural atlases are difficult to analyze the correlation between the subjects and to make utilization based on the various points of view since they are implemented mostly by a single theme. To solve these problems, we propose a method that express a variety of themes by using layer functions of electronic cultural atlases. Using thematic overlay functions, also, application plans are suggested to analyze the relationship between subjects and to derive new knowledge through the association of various themes.

• Journal of Korea Water Resources Association
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• v.56 no.10
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• pp.603-617
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• 2023

This study aims to provide a better understanding of the turbulent flow characteristics in swash zone. A double dam-break method is employed to generate the swash zone flow. Comparing with the conventional single dam-break method, a delay between two gate opening can be controlled to reproduce various interactions between uprush and backwash. For numerical simulations, overInterDyMFoam based on OpenFOAM is adopted. Using overInterDyMFoam, interface between two immiscible fluids having different densities (i.e., air and water phases) can be tracked in a moving mesh with multiple layers. Two-dimensional Reynolds-Averaged Navier-Stokes equations are solved with a standard 𝜅-𝜖 turbulence model for momentum and continuity. Numerical model results are validated with laboratory experiment data for the time series of water depth and streamwise velocity. Turbulent kinetic energy distribution is further investigated to identify the turbulence evolution for each flow regime (i.e., uprush, backwash, and swash-swash interaction).