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이병수(Lee, Byoung-Soo) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.4
An automotive windshield wiper system is modeled mainly for vibration analysis purpose. The model is composed of solid links, ideal joints, imperfect joints to simulate unavoidable manufacturing defects and bushings having stiffness, contact between a wiper blade and a wind screen glass, friction, a spring and an actuator. Main stream of wiper dynamics analysis has been obtaining a closed form of system of equations using Newton's or Lagrange's formula and doing a numerical simulation study to understand and predict the behavior of it. However, the modeling process is complex since a wiper system is of multibody and a contact problem occurs. When imperfection, such as dead zone of a joint and stiffness of a rubber bushing, should be included, the added complexity makes the modeling difficult. Since the imperfection is understood as main cause of problematic vibration, the dynamics model of a wiper system aiming vibration analysis should include such unavoidable manufacturing defects in the model. An open form of dynamic model of a automotive windshield wiper system with imperfect joints using a commercial software is obtained and a simulation analyssis is conducted for vibration reduction study.
일반 순서 통계량을 이용한 소프트웨어 신뢰확률 중첩모형에 관한 베이지안 접근에 관한 연구
이병수(Lee Byoung Soo),김희철(Kim Hee Cheul),백수기(Paik Su Ki),정관희(Chung Kwan Hee),윤주용(Yoon Ju Yong) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.8
The complicate software failure system is defined to the superposition of the points of failure from several component point process. Because the likelihood function is difficulty in computing, we consider Gibbs sampler using iteration sampling based method. For each observed failure epoch, we applied to latent variables that indicates with component of the superposition mode. For model selection, we explored the posterior Bayesian criterion and the sum of relative errors for the comparison simple pattern with superposition model. A numerical example with NHPP simulated data set applies the thinning method proposed by Lewis and Shedler[25] is given, we consider Goel-Okumoto model and Weibull model with GOS, inference of parameter is studied. Using the posterior Baysian criterion and the sum of relative errors, as we would expect, the superposition model is best on model under diffuse priors.
창의·인성 함양을 위한 초등생존수영 교육참가자의 수중불안과 안전행동이 수업만족에 미치는 영향
이병수 ( Lee Byoung Soo ),김승석 ( Kim Seung Seok ) 국제뇌교육종합대학원 인성교육연구원 2023 인성교육연구 Vol.8 No.1
본 연구는 안전교육이 강조되고 있는 현 시점에서 창의·인성 함양을 위한 생존 수영교육에 참가한 초등학생의 수중불안과 안전행동이 수업만족도에 어떠한 영향을 미치는지를 규명하고자 하였다. 연구대상은 생존수영교육에 참가한 초등학교 3~6학년 학생들을 모집단으로 총 343부를 최종 분석에 활용하여 SPSS 24 프로 그램으로 통계처리 하였다. 첫째, 생존수영교육 참가자의 수중불안은 수업만족에 부분적으로 유의한 영향을 미치는 것으로 나타났다. 둘째, 생존수영교육 참가자의 수중불안은 안전행동에 부분적으로 유의한 영향을 미치는 것으로 나타났다. 셋째, 생존수영교육 참가자의 수중불안과 안전행동은 수업만족에 부분적으로 유의한 영향을 미치는 것으로 나타났다. 연구결과 생존수영은 자신의 안전은 물론 타인의 안전까지 함께 하는 공동체 교육을 통해 생성되는 서로 간의 믿음은 창의·인성교육 향상을 가지고 올 수 있기 때문에 교육의 가치가 상당히 높다고 판단된다. 따라서 학문적 측면과 생존수영교육 운영에 대한 실용적 측면에서 그 효용성이 기대되며, 생존수영 참가자의 수중불안이 안전행동과 수업만족에 미치는 영향을 봄으로써 앞으로의 생존수영 교육에 있어 공동체 수업으로써 올바른 교육 방향성 제시와 창의·인성 함양의 기초가 될 수 있다는 점에서 큰 의의가 있다. This study aimed to find out how elementary school students' underwater anxiety and safety behavior affect class satisfaction by participating in survival swimming education for creativity and character cultivation at the present time when safety education is emphasized. The study subjects were 3rd to 6th-grade elementary school students who participated in survival swimming education, and a total of 343 copies were used in the final analysis and statistically processed with the SPSS 24 program. First, it was found that the underwater anxiety of survival swimming education participants partially had a significant effect on class satisfaction. Second, it was found that the underwater anxiety of survival swimming education participants partially had a significant effect on safety behavior. Third, it was found that the underwater anxiety and safety behavior of survival swimming education participants partially had a significant effect on class satisfaction. Therefore, by examining the effect of survival swimming participants' safety behavior and class satisfaction on safety behavior and class satisfaction, its effectiveness is expected in terms of academic and practical aspects of survival swimming education operation. It is of great significance in that it can serve as a foundation.
이병수(Lee, Byoung-Soo),최해운(Choi, Hae-Woon) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.5
A transmission control cable connects the transmission control arm and the control lever mechanically and transfers control effort exerted by a driver to the transmission. It also transfers vibration generated by the engine to the passenger room through mechanical connection. To understand vibration and noise transfer mechanism and to further find a way to suppress the transmission of vibration effectively, a dependable dynamic vibration model is a necessity. A vibration model for a transmission control cable is developed and a simulation study has been conducted to obtain mode frequencies and a transmittability. The resonance frequencies obtained by an harmonic analysis is compared with the noise level measurement data. The measurement agrees with the simulation result thus ensures the reliability of the model.
정보보호 : 안전성이 높은 다변수 Knapsack 암호시스템
이병수(Lee Byoung Soo) 한국정보처리학회 1995 정보처리학회논문지 Vol.2 No.4
고도의 정보화 사회에서 데이터의 내용변경, 중요한 데이터의 불법적인 유출, 순서 변경 그리고 미확인 송신자와 수신자등에 의하여 항상 위협을 받음으로써 데이타의 안전성이 요구되고 있다. 본 연구에선느 컴퓨터 통신의 안전을 위한 다변수 Knapsack 암호시스템을 제안하였다. 이 시스템은 기존의 Knapsack 암호시스템보다도 간단하면서 높은 안전성을 갖는다. 그리고 제안된 암호 시스템은 초증가 벡터의 각 요소를 변형하여 다변수 다항식으로 표현한 것을 암호벡터로 구성한다. 암호문의 복호는 비밀의 정수와 초증가벡터를 사용하면 평문이 구해진다. 따라서 이 암호의 안전성은 비밀의 정수를 다변수 다항식으로 나타내는 암호벡터에 대입할 때 암호벡터가 초증가벡터로 되는 근을 구하는 것의 어려움에 근거하고 있다. 제안된 다변수 Knapsack 암호시스템의 타당성이 컴퓨터 시뮬레이션을 통하여 입증되었다. In the high information societies, the requirement of encryption security is increasing so as to protect information from the threat of attacks by illegal changes of data, illegal leakage of data, disorder of data sequences and the unauthorized sender and an unauthorized receiver etc. In this paper, multivariable knapsack cryptosystem is proposed for security of computer communication. This system is securer and simpler than the conventional knapsack cryptosystems. And, proposed cryptosystem composed what represented each element of superincreasing vector with multivariable polynomial after transforming it of ciphervector. For the deciphering of ciphertext, the plaintext is determined by using the integers of secret and the superincreasing vector of secret key. Thus, the stability of this cryptosystem is based on the difficulty of obtaining the root that ciphervector becomes the superincreasing vector, in substituting the integers of secret for ciphervector to represent with the miltivariable polynomial. The propriety of proposed multivariable knapsack cryptosystem was proved through computer simulation.