• 한국데이터정보과학회:학술대회논문집
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• 2006.11a
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• pp.51-57
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• 2006

Association rule mining searches for interesting relationships among Items in a given database. Association rules are frequently used by retail stores to assist in marketing, advertising, floor placement, and inventory control. There are three primary quality measures for association rule support and confidence and lift. In this paper we present association rule mining based antecedent variables. We call these rules to antecedent association rules. An antecedent variable is a variable that occurs before the independent variable and the dependent variable. For example, in politics, a special interest group may want to support a politician who backs their cause. The group would look for a candidate who supports their views and support his election. Once in office, the politician would then conduct policy that supports the interest group.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.361-363
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• 2017

최근 소셜 미디어의 이용률이 폭발적으로 증가함에 따라, 방대한 데이터가 네트워크로 쏟아져 나오고 있다. 이들 데이터는 기존의 정형 데이터뿐만 아니라 이미지, 동영상 등의 비정형 데이터가 있으며, 이들을 포괄하여 빅데이터라고 불린다. 이러한 빅데이터는 오피니언 마이닝, 테스트 마이닝 등의 기술적인 분석 기법과 빅데이터 요약 및 효과적인 표현방법에 대한 시각화 기법에 대하여 활발한 연구가 이루어지고 있다. 이 논문은 인기 있는 사회연결망 서비스인 Twitter의 트윗을 수집하고, 빅데이터 분석 기법인 텍스트 마이닝을 활용하여 2017년 대선에 대하여 분석하였다. 또한 분석된 자료의 효과적인 전달을 위해 워드 클라우드 진행하였다. 이 논문을 위하여 인기 있는 SNS인 Twitter의 최근 7일간 트윗(tweet)을 수집하고 분석하였다.

• Bulletin of the Korean Chemical Society
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• v.30 no.7
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• pp.1588-1592
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• 2009

Lithium cyanoaluminum hydride (LCAH) was prepared by the metal cation exchange reaction of sodium cyanoaluminum hydride with lithium chloride in tetrahydrofuran. The reducing characteristics of LCAH were explored systematically by the reaction with selected organic compounds containing representative functional groups under the standardized conditions (tetrahydrofuran, 0 ${^{\circ}C}$). The reducing ability of LCAH was also compared with of the sodium derivative, sodium cyanoaluminum hydride (SCAH). Generally, the reducing behavior of LCAH resembles that of SCAH closely, but the reactivity of LCAH toward representative organic functional groups appeared to be stronger than that of SCAH. Thus, the regent reduces carbonyl compounds, epoxides, amides, nitriles, disulfides, carboxylic acids and their acyl derivatives to the corresponding alcohols or amines, at a relatively faster rate than that of SCAH. The cyano substitution, a strong election-withdrawing group, diminishes the reducing power of the parent metal aluminum hydrides and hence effects the alteration of their reducing characteristics.

• Journal of the Korea Safety Management & Science
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• v.5 no.3
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• pp.121-131
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• 2003

This study centers on how the electronic democracy which is expected to be a political system of information society may increase civic participation and develop political system. On the other hand, critics of internet voting claim that the technology required to properly authenticate voters and assure the accuracy and integrity of the election system either does not exist or is not widespread enough in society to be equitable and effective. In order to capture the potential that this new technology offers, it must be implemented correctly, upon a well-conceived framework of standards and procedures. At the same time, government must seek the advice of industry leaders as well as social activists so as to avoid the many obstacles that will undoubtedly arise.

• The Journal of Information Technology and Database
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• v.7 no.1
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• pp.17-26
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• 2000

To provide highly available services in the distributed object system, it is required to support the object group. The state machine approach and primary-backup approach are proposed as two representative approaches for support of object group. The primary-backup approach does not only give merits such as transparency of object group and non-deterministic execution but also require less resource than state machine approach. This paper describes an extension of CORBA that is required to support of the primary-backup object group. In this paper, the state of backup is synchronized with primary through the atomic multicast protocol whenever the request of client is executed at primary. As a result, it does not require message logging and check pointing. The object group of this paper also provides fast response time in case of failure of the primary since it makes primary election unnecessary. And through an extension of IDL, it makes possible to avoid consistency control depending on characteristic of application. A prototype has been implemented and the performance of object group has been compared with a single object invocation.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.6
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• pp.1647-1652
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• 2008

The PEGASIS protocol is more effective about energy consumption more than LEACH in USN environment. However, PEGASIS is weakness enemy in change of sensor network net composition because It changes BS node frequently. Therefore, we propose new routing protocol that use Sub-Cluster Chaining to solve this problem in this paper. It can reduce overhead that happen in election of middle node doing so and reduce energy consumption. Also, It can supplement limitation that PEGASIS has. This is treatise shows that new protocol that propose than existent PEGASIS through simulation is superior.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.382-384
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• 2003

분산 시스템 상에서 공유되는 정보와 노드들의 동기화를 위하여 코디네이터를 선출하여 하부작업을 다른 노드에 할당하거나 분산된 노드 관리에 사용한다. 코디네이터 선출 알고리즘은, 분산된 노드들 간의 sing-point-of-failure를 피하여 동적으로 코디네이터를 선출하여 코디네이터 부재 시의 시스템의 상태와 기능을 복귀시키게 된다. 본 논문에서는 기존의 코디네이터 선출 알고리즘의 문제점을 보안하기 위하여 fail이 존재하는 네트워크상에서 사용 가능한 안정성 있는 효과적인 코디네이터 선출 알고리즘을 제안하고 실험을 통해 코디네이터 선출과 합병에 걸리는 시간을 측정한다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06c
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• pp.192-194
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• 2012

선거는 한 국가의 발전에 큰 영향을 미치는 중요한 행사이다. 국민들의 선거에 대한 관심은 해가 갈수록 증가하고 있고, 선거철마다 많은 여론이 형성되고 있다. 유권자들은 자신이 원하는 후보를 선정하기 위해 많은 후보자 정보를 살펴보아야한다. 올바른 판단을 위해서는 수많은 정치인과 정당에 대한 사전 분석이 필요할 것이다. 이는 시사나 정치에 대한 지속적인 관심이 요구되기 때문에 쉬운 일이 아니다. 그래서 후보자에 관한 기사나 공인된 온라인 토론에서의 정보를 검색하고 점수화하여, 투표자들이 후보를 결정하는데 도움을 줄 수 있는 방법을 제안한다.

• Archives of Pharmacal Research
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• v.20 no.6
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• pp.519-524
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• 1997

Steroid $9{\alpha}$-hydroxylase is an enzyme found in nocardioform microorganisms which can utilize steroids as a sole carbon source. After fractional centrifugation of the cell homogenates, the enzyme activity in Nocardia and Rhodococcus was found in cytoplasmic membrane fraction. On the contrary, Mycobacterium had its 9.alpha.-hydroxylation activity in cytosolic fraction. To characterize the enzyme in these microorganisms, several potential inhibitors of 9.alpha.-hydroxylase were tested and the cofactor requirement for the same enzyme was also examined. The inhibitory effect of ferrous ion chelators indicated involvement of iron containing proteins in the 9.alpha.-hydroxylase system. On the other hand, metyrapone, an inhibitor known to be specific for cytochrome P450 interfered with the enzyme in Mycobacterium, but didn't inhibit the enzyme activity in Nocardia and Rhodococcus. While the $9{\alpha}$-hydroxylase system in Nocardia and Rhodococcus required NADPH, NADH was required as an election donor in Mycobacterium.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.1030-1032
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• 2012

클러스터 기반 라우팅 방법에서 클러스터 헤드에 고장이 발생하면, 전달되지 못하는 센서 데이터가 존재한다. 이를 해결하기 위해 각 클러스터마다 백업 클러스터 헤드를 지정함으로써 원래의 클러스터 헤드에 고장이 발생했을 때 백업 클러스터 헤드가 그 역할을 대신하도록 하는 방법이 연구되고 있다. 백업 클러스터 헤드를 이용한 방법에서는 어떤 노드를 백업 클러스터 헤드로 선출하느냐에 따라 무선센서네트워크의 성능이 좌우된다. 따라서, 본 논문에서는 무선센서네트워크의 에너지 효율성을 높이기 위해 퍼지를 이용하여 각 클러스터의 백업 클러스터 헤드를 선출하는 방법을 제안한다.