• The Korean Journal of Applied Statistics
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• v.15 no.2
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• pp.405-414
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• 2002

We consider the problem of estimating the error variance of in a two-way mixed-effects ANOVA model using noninformative priors. First, we derive Jeffreys' prior, a reference prior, and matching priors. We then provide marginal posterior distributions under those noninformative priors. Finally, we provide graphs of marginal posterior densities of the error variance and credible intervals for the error variance in two real data set and compare these credible intervals.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.484-486
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• 2004

현재 웹 서비스의 결합을 기술하기 위한 다양한 방법들이 제시되고 있지만 XLANG과 WSFL의 장점을 수용한 BPEL4WS로 통합되고 있는 추세이다. BPEL4WS는 비즈니스 프로세스에 참여하는 웹서비스들간의 상호동작과 프로세스의 상태 정보를 기술할 수 있는 효과적인 방법을 제공한다. 그러나, BPEL4WS로 기술된 명세를 웹서비스화 하기 위한 실행 방안에 대한 연구는 미흡한 실정이다. 이에 본 논문은 비즈니스 프로세스에 내재된 워크플로우 그래프로부터 간략화 된 실행 그래프의 생성 방법을 제안한다. 또한 실행 그래프를 이용하여 BPEL4WS 명세의 병렬 및 분산 실행을 지원하는 구현 방안에 대해 논의한다.

• Journal of the Korean earth science society
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• v.31 no.4
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• pp.378-391
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• 2010

The purpose of this study was to investigate the graph interpretation ability and perception of high school students and preservice secondary teachers in Earth science. We developed two different instruments; one was a graph interpretation ability inventory that consists of 9 graph types with 18 items, and the other one is two questionnaires to explore the participants' perception about Earth science-related graph. The results of this study are as follows: High school students and preservice secondary teachers demonstrated their remarkable ability in interpreting a line graph, but showed their limited ability with the graph of overlapped and directional change, which means the graph interpretation ability was affected by a graph type; two groups participated in this study revealed a considerable difference in the graph interpretation ability depending on the grade level; preservice teachers were superior to high school students in discriminating two graphs, the representation method, which are different with the same topic; and many participants in both groups considered that the property of Earth science graph was considerably different from that of other science subjects, especially in directional change graph, scatter graph, contour map, and domain graph. The results suggest that the effective graph instruction strategies be developed in Earth science learning.

• Journal of Internet Computing and Services
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• v.12 no.6
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• pp.1-17
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• 2011

The performance of DHCS depends on the algorithm which schedules input DAG. However, as the task scheduling problem in DHCS is an NP-complete problem, heuristic approach has to be made. Task scheduling algorithm consists of task prioritizing phase and processor allocation phase, and most of studies are considering both phases together. In this paper, we focus on task prioritizing phase and propose a WPD algorithm which is optimized for task duplication based processor allocation method. For an evaluation of the proposed WPD algorithm, we combined WPD algorithm with processor allocation phase of HMPID, HCPFD, HCT algorithms, which are using task duplication based processor allocation method. The results show that WPD algorithm makes a better use of task duplication than conventional task prioritizing methods and provides 9.58% better performance than HCPFD algorithm, 1.31% than HCT algorithm.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.571-572
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• 2017

The blockchain technology that implements electronic money uses decentralized computing and all transactions in a blockchain are open to everyone. This technique seems to guarantee anonymity by performing the transaction on the address instead of the user, but by using direction acyclic graph based on the transaction graph, the privacy problem is caused by tracking the addresses. In this paper, we analyze various techniques for centralized processing which makes it difficult to find the relevance on the graph in order to protect the privacy in the block chain technology. We also analyze the techniques of anonymizing in a distributed way to enhance privacy. Using the zero knowledge proof scheme guarantees full distributed anonymity but requires more computation and storage space, and various techniques to make this efficient are proposed. In this paper, we propose a privacy protection scheme of blockchain technology to integrate existing privacy protection techniques into a blockchain technology and perform it more efficiently with a centralized or decentralized technique.

• Journal of KIISE:Computer Systems and Theory
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• v.29 no.1
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• pp.22-34
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• 2002

In this paper, we consider ring embeding problem in faulty (n,k) star graphs which is recently proposed as an alternative interconnection network topology, By effectively utilizing such strategies as series of dimension expansions and even distribution of faulty nodes into sub-stars in graph itself. we prove that it is possible to construct a maximal fault-free ring excluding only faulty nodes when the number of faults is no more than n-3 and $n-k{\geq}2$, and also propose an algorithm which can embed the corresponding ring in (n.k)-star graphs This results will be applied into the multicasting applications that the underlying cycle properties on the multi-computer system.

• The Transactions of the Korea Information Processing Society
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• v.6 no.5
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• pp.1280-1290
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• 1999

Applying the change impact analysis to the distributed environment is not straightforward since it is based on the centralized system environment. In this paper, we investigate the change impact analysis of object-oriented shoftwares in the distributed environment. We first, categories the types of changes common in object-oriented software into three sets: data, method, and class level changes. We, then, analyze the impact of each set of changes and represent it in the form of a DPDG. A DPDG is a graph showing relationship of object oriented softwares - with data elements. classes, design documents, servers - in the distributed environment. DPDG searches element of software to retest when the software is changed. Thus, DPDG saves effort of software to retest. In this paper, We propose the table of firewall for retest elements that be discovered by DPDG and implement the table of firewall. The table of firewall is used VIST that we design a software testing tool. The VIST utilizes the minimized firewall, then saves efforts and costs of retesting for distributed object-oriented software.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.70-72
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• 2003

응용프로그램사이에 데이터의 이동을 위한 형식으로 XML이 사용되고 있다. XSL 또한 웹 브라우저에서 XML 데이터를 보여주고, 응용프로그램에서 데이터를 제거하거나 추가하기 위한 표준이 되었다. 본 논문에서는 분산 서버의 관계형 데이터베이스의 성능정보를 보이기 위해 DTD를 생성하고, 데이터를 XML형식으로 변환하여, 차트나 그래프로 XSL을 이용하여 보여주는 방법을 제안한다.

• Journal of Korean Society of Archives and Records Management
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• v.23 no.4
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• pp.159-178
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• 2023

A digital archive is an online platform for preserving and utilizing digital records worthy of continued preservation. However, there are no shared standards for functionality, metadata, or data technical principles across digital archives in Korea. These issues create challenges in linking distributed digital records. This study proposes a common vocabulary for digital archives to enhance the interoperability of digital records and evaluates the interoperability of the digital archive built with the common vocabulary. We collect and analyze data from the digital archive on the Korean financial crisis of 1997 to construct a knowledge graph and compare its interoperability with the knowledge graph built with RiC-O. The archive and the knowledge graph underwent evaluation using the FAIR data principles evaluation framework. The constructed knowledge graph links various objects in the archive and provides contextual information to aid in understanding the archive. The results demonstrate that a knowledge graph built with a common vocabulary significantly improves the linkage, search, and interoperability of digital records compared to a traditional archive.

• Korean Chemical Engineering Research
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• v.53 no.5
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• pp.614-619
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• 2015

A plasma surface modification of powders has been carried out in a circulating fluidized bed reactor under reduced pressure. Polystyrene (PS) particles treated by plasma are grafted with polyethylene glycol (PEG) on the surface. The virgin, plasma-treated and grafted powders were characterized by DPPH method, FTIR, SEM and contact angle meter. The plasma-treated PS powders have well formed peroxide on the surface, By PEG grafting polymerization, PEG is well grafted and dispersed on the surface of the plasma-treated PS powders. The PEG-g-PS particle was successfully synthesized using the plasma circulating fluidized bed reactor under reduced pressure.