• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.549-550
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• 2021

본 논문에서는 다양한 돌연변이 전략을 인식하기 위해 MUDE (Uniform Local Search)를 사용한 다중 인구 차등 진화 알고리즘을 제안한다. MUDE에서 집단은 진화 비율(DE/rand/1 및 DE/current-to-rand/1)에 따라 서로 다른 돌연변이 전략을 수행하는 다른 집단 크기를 가진 여러 하위 집단으로 나뉜다. 인구의 다양성을 개선하기 위해 정보는 소프트 아일랜드 모델에 의해 하위 인구 간에 마이그레이션된다.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 2004년도 추계학술대회
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• pp.7-7
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• 2004

• Journal of the Optical Society of Korea
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• 제1권2호
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• pp.74-80
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• 1997

300mm F/4.0 telephotolens with diffractive hybrid lens was designed, and its optical performance was tested and compared with a traditional lens system. DOE(Diffractive Optical Element) reconstructs wavefronts using wave phenomena of light to focus the incident light onto the focal point and has negative Abbe number while a traditional lens uses geometrical phenomena of light and has positive Abbe number. Therefore, a diffractive hybrid lens containing both refractive and diffractive elements can remarkably correct chromatic aberration and spherical aberration of an optical system. We investigated and analyzed the optical properties of a diffractive hybrid lens for the visible spectrum, and we used a difractive hybrid lens to design and evaluate a 300mm F/4.0 telephotolens without the special LD(Low Dispersive) glass lens which is costly and difficult to manufacture. Most traditional telephotolenses use the special LD glass for chromatic aberration correcton. Optical performance tests such as resolution and characteristics of aberration of both lens systems using a diffractive hybrid lens and traditional lens were performed.

• 응용통계연구
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• 제17권1호
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• pp.135-144
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• 2004

K-평균 군집화(K-means clustering)는 고객 세분화(customer segmentation) 등 데이터 마이닝에서 중요한 한 몫을 하는 비지도 학습방법 (unsupervised learning method)이다. K-평균 군집화가 재현성(reproducibility)이 있는가를 보기 위하여, 다수의 기존 연구에서는 관측 자료를 2개 셋으로 나눈 자료 분할(data partitioning) 방법이 활용되고 있다. 본 교신에서 우리는 이보다 개념적으로 명확한 새로운 자료 분할 방법을 제안한다. 이 방법은 관측 자료를 3개 셋으로 나누어 그 중 2개 자료 셋을 독립적인 군집화 규칙을 생성하는 데 사용하고 나머지 1개의 자료 셋을 규칙간 일치성을 테스트하는데 사용한다. 또한 2개의 군집화 규칙간 일치성 평가를 위한 지표로서 엔트로피 기준의 환용 방법을 제시한다.

• 보건교육건강증진학회지
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• 제21권2호
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• pp.199-214
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• 2004

This study was aimed to assess the social functions of rural residents and to identify factors related with social function. This study conducted a survey using interview-type questionnaires with the Rand social health battery, and measured social function and the related factors between August 21th and August 23th, at 2001. The study subjects were 546 people (158 males, 388 females) living in Chungju-City. The social functions of the subjects were very weak. 20.7 % of respondents said they had no family in their neighbors and they were not well enough acquainted with neighborhood to visit each other. The 24.2 % of respondents said they had no mend that they felt at ease with and could talk frankly. Social function scores were significantly associated with economic status (p＝0.0494), having a vehicle (p＝0.0019), daily living activity (p＝0.0092) in multiple analysis. However, there was no association with age, education, smoking, alcohol consumption, and chronic disease. Our finding showed that social function was not associated with health behaviors definitely. However, It may be important to change existing social network and social function in order to change health behaviors.

• 대한조선학회논문집
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• 제59권5호
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• pp.330-337
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• 2022

Research on object detection algorithms using 2D data has already progressed to the level of commercialization and is being applied to various manufacturing industries. Object detection technology using 2D data has an effective advantage, there are technical limitations to accurate data generation and analysis. Since 2D data is two-axis data without a sense of depth, ambiguity arises when approached from a practical point of view. Advanced countries such as the United States are leading 3D data collection and research using 3D laser scanners. Existing processing and detection algorithms such as ICP and RANSAC show high accuracy, but are used as a processing speed problem in the processing of large-scale point cloud data. In this study, PointNet a representative technique for detecting objects using widely used 3D point cloud data is analyzed and described. And RandLA-Net, which overcomes the limitations of PointNet's performance and object prediction accuracy, is described a review of detection technology using point cloud data was conducted.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국제학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.1028-1032
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• 1988

The purpose of this paper is the development of a fully integrated simulation package for industrial robot. The simulation package consists of kinematics, dynamics, and control. The kinematics contains trajectory plans and inverse kinematics. The dynamics combines manipulator dynamics and actuator dynamics including the effect of payloads and viscous frictions. The control is a hardware oriented scheme which contains position controller, velocity controller, current controller, and PWM generator. Thus, the simulation package can be used not only for theoretical purposes but also for development purposes in industry. Using this package, the characteristics and performances of the SCARA robot, which has been developed in GSIS, are investigated.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2019년도 추계학술발표대회
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• pp.456-458
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• 2019

정보보안을 달성하기 위해서 컴퓨터가 보급된 이래로 많은 노력이 이루어졌다. 그중 메모리 보호 기법에 대한 연구가 가장 많이 이루어졌지만, 컴퓨터의 성능 향상으로 이전의 메모리 보호 기법들의 문제들이 발견되고, 부채널 공격의 등장으로 새로운 방어책이 필요 되었다. 본 논문에서는 프로그램에 정적 바이너리 재작성(Static Binary Rewriting) 기법을 통해 페이지(Page)마다 4~8byte 의 난수를 삽입하여 메모리 공유 기반 부채널 공격을 방어할 수 있는 2 가지 방법을 제시한다. 최근 아키텍처는 분기 예측(Branch Prediction)을 통해 jmp 명령어에 대한 분기처리가 매우 빠르고 정확하게 처리되기 때문에 난수를 삽입할 때 사용하는 jmp+rand 방식은 오버헤드가 매우 낮다. 또한 특정 프로그램에만 난수 삽입이 가능하므로 특히 클라우드 환경에서 중복제거 기능과 함께 사용하면 높은 효율성을 보일 수 있다고 예상한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권1호
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• pp.120-144
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• 2023

With the expansion of digital communication networks, a considerable number of randomization techniques have been invented and implemented to enhance the different data transmission algorithms' levels of security. Steganography is among the data transmissions techniques used to hide secret data. Nowadays, several randomization techniques have been used in steganography to elevate the security of transmitted data. Unfortunately, the majority of these techniques lack some simplicity, efficiency, and flexibility, in addition to other limitations. This research presents a new randomization technique called Rand-Stego. Rand-Stego could be applied/practiced over any steganography technique. It provides simplicity and efficiency and elevates the security level. Examples of implementing the proposed technique on some steganography algorithms will be explored. The proposed and current techniques will be compared. The obtained results show Rand-Stego's superiority in terms of efficiency and flexibility when compared to the current techniques.

• 국방과기술
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• 4호통권230호
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• pp.30-37
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• 1998

본 내용은 RAND 연구소에서 발행한 보고서 Troubled Partnership An Assessment of U.S.-Japan Collaboration on the FS-X Fighter의 요약으로 전형적인 미국의 시각에서 사업 위주로 분석하였다. 기 발행된 보고서와 상호 보완 역할을 하여 독자들에게 객관적인 자료를 제공하게 되어 그 의의가 클 것이다. 이보고서는 미국과 일본의 FS-X 전투기 공동 개발에 관한 RAND 연구소의 조사 결과와 평가를 종합한 것이며, 장기간에 걸친 미 항공우주산업 협력 개발사업의 적용과 기술 이전 문제에 초점을 맞추고 있다.