• Proceedings of the Korean Society for Information Management Conference
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• 2005.08a
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• pp.71-78
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• 2005

빠르면서도 정확한 문서 자동분류를 위해서 자질값투표 기법과 문서측 자질선정 방식의 결합을 제안하였다. 자질값은 미리 학습된 분류자질과 분류범주간의 연관성을 뜻하는 것으로서, 자질값투표 기법은 분류대상 문서에 나타난 자질들의 자질값을 후보범주마다 합산하여 가장 높은 범주로 분류하는 것이다. 문서측 자질선정은 일반적인 분류자질선정과 달리 학습집단이 아닌 분류대상 문서의 자질 중 일부만을 선택하여 분류에 이용하는 방식이다. 이들을 결합하여 사용한 결과 실험환경에서는 나이브베이즈 분류기만큼 간단하고 빠르면서 SVM 분류기보다 좋은 성능을 보였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.271-272
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• 2015

센서 네트워크에서 센서는 제한적인 자원 때문에 다양한 공격으로부터 취약하다. 이러한 공격 중 하나인 허위 보고서 삽입 공격은 불필요한 에너지 소모와 허위 알람을 유발한다. 이 공격의 피해를 줄이기 위한 확률적 투표 여과 기법은 검증 노드를 통해 보고서의 맥들을 검증한다. 그러나 허위 보고서가 검증 노드까지 도달하는 데 불필요한 에너지가 소비된다. 본 논문에서, 우리의 제안 기법은 소스의 다음 노드에 키를 배포하여 허위 보고서 삽입 공격을 효율적으로 감지한다. 따라서 제안 기법은 기존 기법보다 에너지 효율성 향상을 기대할 수 있다.

• Journal of the Korea Society for Simulation
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• v.23 no.2
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• pp.65-72
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• 2014

Sensor nodes are easily compromised by attacker when which are divided in open environment. The attacker may inject false report and false vote attack through compromised sensor node. These attacks interrupt to transmission legitimate report or the energy of sensor node is exhausted. PVFS are proposed by Li and Wu for countermeasure in two attacks. The scheme use inefficiency to energy of sensor node as fixed report threshold and verification node. In this paper, our propose the next neighbor node selection scheme based on fuzzy logic system for energy improvement of PVFS. The parameter of fuzzy logic system are energy, hops, verification success count, CH select high the next neighbor node among neighbor nodes of two as deduction based on fuzzy logic system. In the experimental, our proposed scheme was improvement to energy of about 9% compare to PVFS.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.10 no.4
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• pp.21-32
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• 2000

We have seen a lot of developments on computer application areas with the wide spread use of computers and the rapid growth of communication network. It is necessary to use a cryptographic technique for electronic voting, but, at present, despite of its importance electronic voting protocols so far have many shortcomings. In this paper, with the assumption of a trustable voting centers we propose a large-scale and practical electronic voting protocol satisfying protocol requirements, such as secureness, fairness, privacy of voter and correctness. Voters are able to get a vote without revealing their voted information by using the blinding technique. We can find the injustice between a voter and the tallier by using undeniable challenge and responsible protocol. Also, we proposes a secure protocol that compensates a integrity of electronic voting and protects a privacy of voter from outer attacks as using a anonymity of voter.

• Journal of Information Management
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• v.36 no.4
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• pp.51-69
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• 2005

High-speed classification method becomes an important research issue in text categorization systems. A fast text categorization technique, named feature value voting, is introduced recently on the text categorization problems. But the classification accuracy of this technique is not good as its classification speed. We present a novel approach for feature selection, named document-side feature selection, and apply it to feature value voting method. In this approach, there is no feature selection process in learning phase; but realtime feature selection is executed in classification phase. Our results show that feature value voting with document-side feature selection can allow fast and accurate text classification system, which seems to be competitive in classification performance with Support Vector Machines, the state-of-the-art text categorization algorithms.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.656-658
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• 2003

무선 인터넷 망의 구축과 휴대용 정보기기의 일반 보급으로 이동형 정보 환경이 최근 급속히 확산되고 있다. 본 논문은 이동형 환경에서의 거래 안정성과 데이터 가용성 증대를 위한 새로운 복제 데이터 관리 기법을 제안한다. 제안된 위임 정족수 합의(Proxy Quorum Consensus) 모델은 불안정한 상태의 다수의 모바일 사이트에 직접적인 투표를 하지 않는 대신에, 미리 선출한 대표 정족 집단에 위임함으로써, 안정된 위임 투표(Proxy Voting)를 진행하는 제어 기법이다. 이 기법을 통하여 통신 비용 절감 및 응답 속도 향상 등의 효과를 기대할 수 있다.

• Journal of KIISE
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• v.43 no.8
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• pp.869-877
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• 2016

In this paper, we propose an automated segmentation method of femoral cartilage in knee MR images using multi-atlas-based locally-weighted voting. The proposed method involves two steps. First, to utilize the shape information to show that the femoral cartilage is attached to a femur, the femur is segmented via volume and object-based locally-weighted voting and narrow-band region growing. Second, the object-based affine transformation of the femur is applied to the registration of femoral cartilage, and the femoral cartilage is segmented via multi-atlas shape-based locally-weighted voting. To evaluate the performance of the proposed method, we compared the segmentation results of majority voting method, intensity-based locally-weighted voting method, and the proposed method with manual segmentation results defined by expert. In our experimental results, the newly proposed method avoids a leakage into the neighboring regions having similar intensity of femoral cartilage, and shows improved segmentation accuracy.

• The Journal of the Acoustical Society of Korea
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• v.33 no.1
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• pp.68-74
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• 2014

In a previous work, we proposed a novel approach of histogram equalization using a supplement set which is composed of centroids of Fuzzy C-Means of the background utterances. The performance of the proposed method is affected by the size of the supplement set, but it is difficult to find the best size at the point of recognition. In this paper, we propose a histogram equalization using a supplement set for majority voting based speaker identification. The proposed method identifies test utterances using a majority voting on the histogram equalization methods with various sizes of supplement sets. The proposed method is compared with the conventional feature normalization methods such as CMN(Cepstral Mean Normalization), MVN(Mean and Variance Normalization), and HEQ(Histogram Equalization) and the histogram equalization method using a supplement set.

• KIPS Transactions on Computer and Communication Systems
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• v.6 no.7
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• pp.315-320
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• 2017

In this paper, I design a new scheme that is immune to malicious attack based on the weighted voting game. By using stochastic learning, the proposed scheme can revoke the certification of malicious node. Through the revocation process, the proposed scheme can effectively adapt the dynamic Mobile Ad hoc network situation. Simulation results clearly indicate that the developed scheme has better performance than other existing schemes under widely diverse network environments.

• Review of KIISC
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• v.10 no.1
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• pp.63-69
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• 2000

본 연구는 전자선거 프로토콜의 요구사항을 규정해 보고, 컴퓨터 통신상에서 이를 충족시키기 위한 암호기법 들을 분석해 본다. 전자선거의 도입이 선거 비용을 절감시키고 투표 장소의 제약을 획기적으로 개선하지만 매표방지등의 문제로 아직은 완전한 이동성을 제공하지는 못한다. 그리고 투표결과의 정확성 검증과 매표방지는 서로 상충되는 요구사항이기도 하다. 실제선거에서는 효율성의 문제로 영지식증명기법등의 사용이 제약 받을 수도 있다. 이러한 문제들을 정리하고, 실제의 선거 절차와 선거 속성들이 전자선거 프로토콜로 어떻게 구현되었는지 비교 검토함으로써, 규정한 요구사항들의 선택적인 적용에 활용코자 한다.