트리 형태의 계층 구조에 적용 가능한 비밀분산법의 설계

송영원,박소영,이상호,Song, Yeong-Won,Park, So-Young,Lee, Sang-Ho 한국정보과학회 2002 정보과학회논문지 : 시스템 및 이론 Vol.29 No.3

비밀분산법은 하나의 비밀정보(secret)를 분산시켜 다수의 참가자(participant)들에게 공유시키고 필요시 허가된 참가자 부분집합만이 비밀정보를 복원할 수 있도록 하는 암호 프로토콜이다. 본 논문에서는 트리(tree) 형태의 계층 구조를 갖는 참가자들에게 적용할 수 있는 새로운 비밀분산법을 제안한다. 참가자들은 트리 상의 상위 레벨부터 비밀정보의 복원에 대한 우선권을 갖는다. 상위 레벨에 속하는 참가자들이 부재 시에는 하위 레벨에 속하는 자식 노드들에게 위임 티켓(delegation ticket)을 전송하여 비밀정보의 복원 권한을 위임할 수 있다. 이러한 위임 과정을 최상위 레벨인 루트부터 비밀정보를 복원하는데 참여 가능한 하위 레벨까지 순차적으로 수행함으로써 제안하는 비밀분산법은 참가자들의 상황에 따라 동적인 접근구조(dynamic access structure)를 갖는다. A secret sharing scheme is a cryptographic protocol to share a secret among a set of participants P in the way that only qualified subsets of P can reconstruct the secret whereas any other subset of P, non-qualified to know the secret, cannot determine anything about the secret. In this paper, we propose a new secret sharing scheme in hierarchical groups, whose hierarchy can be represented as a tree structure. In the tree structure, participants of higher levels have priorities to reconstruct the secret over participants of lower levels. In the absence of the participant of a higher level, it is possible for this participant to delegate the ability to reconstruct the secret to the child nodes of the next lower level through the transfer of his delegation ticket. This scheme has a dynamic access structure through the recursive delegation process from the root to lower levels where participants aren't absent.

트리 형태의 계층 구조에 적용 가능한 비밀분산법의 설계

송영원,박소영,이상호 한국정보과학회 2002 정보과학회논문지 : 시스템 및 이론 Vol.29 No.4

A secret sharing scheme is a cryptographic protocol to share a secret among a set of participants P in the way that only qualified subsets of P can reconstruct the secret whereas any other subset of P, non-qualified to know the secret, cannot determine anything about the secret. In this paper, we propose a new secret sharing scheme in hierarchical groups, whose hierarchy can be represented as a tree structure. In the tree structure, participants of higher levels have priorities to reconstruct the secret over participants of lower levels. In the absence of the participant of a higher level, it is possible for this participant to delegate the ability to reconstruct the secret to the child nodes of the next lower level through the transfer of his delegation ticket. This scheme has a dynamic access structure through the recursive delegation process from the root to lower levels where participants aren't absent. 비밀분산법은 하나의 비밀정보(secret)를 분산시켜 다수의 참가자(participant)들에게 공유시키고 필요시 허가된 참가자 부분집합만이 비밀정보를 복원할 수 있도록 하는 암호 프로토콜이다. 본 논문에서는 트리(tree) 형태의 계층 구조를 갖는 참가자들에게 적용할 수 있는 새로운 비밀분산법을 제안한다. 참가자들은 트리 상의 상위 레벨부터 비밀정보의 복원에 대한 우선권을 갖는다. 상위 레벨에 속하는 참가자들이 부재 시에는 하위 레벨에 속하는 자식 노드들에게 위임 티켓(delegation ticket)을 전송하여 비밀정보의 복원 권한을 위임할 수 있다. 이러한 위임 과정을 최상위 레벨인 루트부터 비밀정보를 복원하는데 참여 가능한 하위 레벨까지 순차적으로 수행함으로써 제안하는 비밀분산법은 참가자들의 상황에 따라 동적인 접근구조(dynamic access structure)를 갖는다.

트리 형태의 계층 구조에 적용 가능한 비밀분산법의 설계

송영원(Young-Won Song),박소영(So-Young Park),이상호(Sang-Ho Lee) 한국정보과학회 2002 정보과학회논문지 : 시스템 및 이론 Vol.29 No.3·4

비밀분산법은 하나의 비밀정보(secret)를 분산시켜 다수의 참가자(participant)들에게 공유시키고 필요시 허가된 참가자 부분집합만이 비밀정보를 복원할 수 있도록 하는 암호 프로토콜이다. 본 논문에서는 트리(tree) 형태의 계층 구조를 갖는 참가자들에게 적용할 수 있는 새로운 비밀분산법을 제안한다. 참가자들은 트리 상의 상위 레벨부터 비밀정보의 복원에 대한 우선권을 갖는다. 상위 레벨에 속하는 참가자들이 부재 시에는 하위 레벨에 속하는 자식 노드들에게 위임 티켓(delegation ticket)을 전송하여 비밀정보의 복원 권한을 위임할 수 있다. 이러한 위임 과정을 최상위 레벨인 루트부터 비밀정보를 복원하는데 참여 가능한 하위 레벨까지 순차적으로 수행함으로써 제안하는 비밀분산법은 참가자들의 상황에 따라 동적인 접근구조(dynamic access structure)를 갖는다. A secret sharing scheme is a cryptographic protocol to share a secret among a set of participants P in the way that only qualified subsets of P can reconstruct the secret whereas any other subset of P, non-qualified to know the secret, cannot determine anything about the secret. In this paper, we propose a new secret sharing scheme in hierarchical groups, whose hierarchy can be represented as a tree structure. In the tree structure, participants of higher levels have priorities to reconstruct the secret over participants of lower levels. In the absence of the participant of a higher level, it is possible for this participant to delegate the ability to reconstruct the secret to the child nodes of the next lower level through the transfer of his delegation ticket. This scheme has a dynamic access structure through the recursive delegation process from the root to lower levels where participants aren't absent.

순간전압강하를 고려한 분산전원 최적위치 선정

송영원(Young-Won Song),이계병(Kyebyung Lee),박창현(Chang-Hyun Park) 대한전기학회 2013 전기학회논문지 Vol.62 No.11

This paper presents a method for determining the optimal placement of distributed generation units considering voltage sags. In general, the existing methods for distributed generation placement do not consider power quality problems such as voltage sags. In this paper, a novel method based on both genetic algorithm and voltage sag assessment is proposed for determining the placement of distributed generation unit. In the proposed method, the optimal placement is determined to minimize voltage sag effects and system losses.

회전기계 고장진단을 위한 최적 환경 구축 방법

송영원(Yeong-won Song),박정우(Jeong-woo Park),유진수(Jin-su Yu),홍세현(Se-hyun Hong) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

This paper presents an optimal environment construction and efficient approach for rotational machine fault diagnosis. As a research method for this, fault diagnosis is performed at various sampling frequencies based on data acquired by over-specification sensors. Statistical features of data are used for fault diagnosis, and statistical features extracted according to various sampling frequencies and data sample size are used as AI model learning variables. Several ensemble models such as Random Forest and XGBoost were used, and the accuracy of the models was compared and analyzed. As a result, the fault diagnosis performance did not significantly increase after the sampling frequency exceeded 10 times the rotating machine’s maximum frequency. This means that even when a low-performance sensor with a low frequency is used, high performance may be expected. Therefore, this paper is expected to contribute to economically performing fault diagnosis.

난류모델이 Pitot Probe의 공력해석에 미치는 영향비교

송영원(Youngwon Song),이승수(Seungsoo Lee) 한국항공우주학회 2018 한국항공우주학회 학술발표회 논문집 Vol.2018 No.11

대기측정장치 L-형 Pitot Probe 공력 해석

송영원(Y.W. Song),이승수(S. Lee),안계현(K.H. Ahn),김성수(S.S. Kim) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.1

In this paper, an L-shaped pitot probe was analyzed with an computational fluid dynamic solver. First, the aerodynamic analysis of the pitot probe at various velocities, angles of attack, and side slip angles was performed to understand the flow characteristics around the pitot probe. In addition, the relationship between the neck length and the boundary layer thickness was studied to determine the proper length of the neck. Based on the results, the proper measurement point locations and the neck length of the pitot probe can be determined.

회전기계 고장진단을 위한 최적 환경 구축 방법

송영원(Yeong-won Song),박정우(Jeong-woo Park),유진수(Jin-su Yu),홍세현(Se-hyun Hong) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

This paper presents an optimal environment construction and efficient approach for rotational machine fault diagnosis. As a research method for this, fault diagnosis is performed at various sampling frequencies based on data acquired by over-specification sensors. Statistical features of data are used for fault diagnosis, and statistical features extracted according to various sampling frequencies and data sample size are used as AI model learning variables. Several ensemble models such as Random Forest and XGBoost were used, and the accuracy of the models was compared and analyzed. As a result, the fault diagnosis performance did not significantly increase after the sampling frequency exceeded 10 times the rotating machine’s maximum frequency. This means that even when a low-performance sensor with a low frequency is used, high performance may be expected. Therefore, this paper is expected to contribute to economically performing fault diagnosis.

풍력 발전 특성을 고려한 순간전압강하 평가

송영원(Young-Won Song),박창현(Chang-Hyun Park) 대한전기학회 2012 전기학회논문지 Vol.61 No.11

This paper presents a method for assessing the voltage sag performance of power system involving wind power generation. Wind power generation is considered as one of the most desirable renewable energy sources. However, wind power generation have uncertain energy output and it is difficult to control the output. The existing methods of voltage sag assessment are not reflected the characteristics of wind power generation. Therefore, in order to more accurately assess the voltage sag performance, the probability of wind power operation is evaluated. In this paper, the probability is determined by combining the wind speed model with the output curve of wind turbine. The probability of wind power operation is reflected as a parameter in voltage sag assessment. The proposed method can provide more accurate results of voltage sag assessment for the case involving the wind power generation.

MPEG-21 디지털 아이템 정의 모델

송영원(Young-Won Song),장도임(Doim Chang) 한국정보과학회 2001 정보과학회지 Vol.19 No.6