Static Output Feedback H∞ Control for a Fractional-order Glucose-insulin System

Ibrahima N’Doye,Holger Voos,Mohamed Darouach,Jochen G. Schneider 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.4

This paper presents the H∞ static output feedback control of nonlinear fractional-order systems. Based on the extended bounded real lemma, the H∞ control is formulated and sufficient conditions are derived in terms of linear matrix inequalities (LMIs) formulation by using the fractional Lyapunov direct method where the fractional-order α belongs to 0 < α < 1. The control approach is finally applied to the regulation of the glucose level in diabetes type 1 treatment. Therefore, it is attempted to incorporate fractional-order into the mathematical minimal model of glucose-insulin system dynamics and it is still an interesting challenge to show, how the order of a fractional differential system affects the dynamics of the system in the presence of meal disturbance. Numerical simulations are carried out to illustrate our proposed results and show that the nonlinear fractional-order glucose-insulin systems are, at least, as stable as their integer-order counterpart in the presence of exogenous glucose infusion or meal disturbance.

Discrete Wavelet Transform and a Singular Value Decomposition Technique for Watermarking Based on an Adaptive Fuzzy Inference System

Lalani, Salima,Doye, D.D. Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.2

A watermark is a signal added to the original signal in order to preserve the copyright of the owner of the digital content. The basic challenge for designing a watermarking system is a dilemma between transparency and robustness. If we want a higher rate of transparency, there has to be a compromise in terms of its robustness and vice versa. Also, until now, watermarking is generalized, resulting in the need for a specialized algorithm to work for a specialized image processing application domain. Our proposed technique takes into consideration the image characteristics for watermark insertion and it optimizes transparency and robustness. It achieved a 99.98% retrieval efficiency for an image blurring attack and counterfeits other attacks. Our proposed technique counterfeits almost all of the image processing attacks.

A Novel DWT-SVD Canny-Based Watermarking Using a Modified Torus Technique

Lalani, Salima,Doye, D.D. Korea Information Processing Society 2016 Journal of information processing systems Vol.9 No.3

Today's modern world requires a digital watermarking technique that takes the redundancy of an image into consideration for embedding a watermark. The novel algorithm used in this paper takes into consideration the redundancies of spatial domain and wavelet domain for embedding a watermark. Also, the cryptography-based secret key makes the algorithm difficult to hack and help protect ownership. Watermarking is blind, as it does not require the original image. Few coefficient matrices and secret keys are essential to retrieve the original watermark, which makes it redundant to various intentional attacks. The proposed technique resolves the challenge of optimizing transparency and robustness using a Canny-based edge detector technique. Improvements in the transparency of the cover image can be seen in the computed PSNR value, which is 44.20 dB.

A Novel DWT-SVD Canny-Based Watermarking Using a Modified Torus Technique

( Salima Lalani ),( D. D. Doye ) 한국정보처리학회 2016 Journal of information processing systems Vol.12 No.4

Today`s modern world requires a digital watermarking technique that takes the redundancy of an image into consideration for embedding a watermark. The novel algorithm used in this paper takes into consideration the redundancies of spatial domain and wavelet domain for embedding a watermark. Also, the cryptographybased secret key makes the algorithm difficult to hack and help protect ownership. Watermarking is blind, as it does not require the original image. Few coefficient matrices and secret keys are essential to retrieve the original watermark, which makes it redundant to various intentional attacks. The proposed technique resolves the challenge of optimizing transparency and robustness using a Canny-based edge detector technique. Improvements in the transparency of the cover image can be seen in the computed PSNR value, which is 44.20 dB.

Discrete Wavelet Transform and a Singular Value Decomposition Technique for Watermarking Based on an Adaptive Fuzzy Inference System

( Salima Lalani ),( D. D. Doye ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.2

A watermark is a signal added to the original signal in order to preserve the copyright of the owner of the digital content. The basic challenge for designing a watermarking system is a dilemma between transparency and robustness. If we want a higher rate of transparency, there has to be a compromise in terms of its robustness and vice versa. Also, until now, watermarking is generalized, resulting in the need for a specialized algorithm to work for a specialized image processing application domain. Our proposed technique takes into consideration the image characteristics for watermark insertion and it optimizes transparency and robustness. It achieved a 99.98% retrieval efficiency for an image blurring attack and counterfeits other attacks. Our proposed technique counterfeits almost all of the image processing attacks.

압력센서 기반의 균형시스템을 이용한 노인균형 특성 연구

권일호(Ilho Kwon),송준영(Junyoung Song),김도예(Doye Kim),손제영(Jeyoung Son),신원섭(Wonseob Shin) 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1

본 연구는 건강한 노인을 대상으로 압력정보제공과 자세정보제공에 따른 시각적 바이오-피드백에 대한 효과를 알아보는 목적으로 Randomized Cross-over Design 으로 연구되었다. 25 명의 노인 참가자를 대상으로 실험하였으며 3 가지 시각적 바이오-피드백의 조건에 무작위 순서로 할당하였다: 압력정보제공에 대한 시각적 바이오-피드백(Condition 1), 자세정보제공에 대한 시각적 바이오-피드백(Condition 2), 비시각적 바이오-피드백(Condition 3). 균형측정을 위해 Wii Balance Board(WBB)와 Balencia software ver 2.0 을 사용하였다. 방법으로 모든 대상자는 3 가지 시각적 바이오-피드백 상태에서 WBB 에 눈을 뜬 상태로 30 초 동안 정적 균형을 측정하였다. Condition 1 은 엄지발가락, 첫 번째와 다섯 번째 발가락허리뼈의 머리부분, 뒤꿈치 아래에 압력센서를 부착한다. 센서로부터 수집된 압력정보는 2m 앞의 LED 에 표시되며, 대상자는 불이 들어온 위치를 보고 체중을 이동시킨다. Condition 2 는 전신거울을 이용하여 자신의 자세를 보며 똑바른 자세를 유지하도록 노력한다. Condition 3 는 시각적 정보없이 2 m 앞에 벽을 보고 스스로 균형을 유지하도록 노력한다. 실험결과 Sway length 와 velocity 에서 모두 시각적 바이오-피드백에 따른 유의한 차이가 있었다 (p<.05). 결론적으로, 압력정보제공에 따른 정적균형훈련은 실제적이고 구체적인 정보를 이용한 훈련으로 효과가 나타난다고 사료된다.

Comparison of multigrid performance for higher order scheme with 5-point scheme

Han, Mun.S.,Kwak, DoY.,Lee, JunS. 한국산업정보응용수학회 2000 한국산업정보응용수학회 Vol.4 No.2

We consider a multigrid algorithm for higher order finite difference scheme for the Poisson problem on rectangular domain. Several smoothers including Jacobi, Red-black Gauss-Seidel are tested and compared. Since higher order scheme gives much more accurate result then 5-point scheme, one may use small number of levels with higher order scheme and thus the overall cost is reduced quite a lot. The numerical experiment compares the two cases.

Z세대의 의류 폐기물 최소화와 효율적 재이용을 위한 서비스 제안

김다빈(Dabin Kim),정도이(doyee Jeong),조문정(munjeong Cho),정혜욱(Hyeuk chung) 한국디자인학회 2022 한국디자인학회 학술발표대회 논문집 Vol.2022 No.11

국내 범죄예방 환경설계(CPTED) 관련 법제적 문제점 및 개선 방향 연구

이창훈(Chang-Hun Lee),최진혁(Justin Jin-Hyuk Choi),권도이(Doy Kwon) 한국셉테드학회 2017 한국셉테드학회지 Vol.8 No.1

최근 국내에서 범죄예방 환경설계(CPTED: 셉테드)에 대한 관심이 전국적으로 고조되면서 정부 부처는 물론 지방자치단체에서도 각종 유관 법규를 제정 해왔다. 하지만 이렇듯 법률적 근거가 마련되었음에도 불구하고 이를 기반으로 진행된 국내 셉테드 사업은 여러 가지 한계점을 내포한 채로 실질적인 사업으로 진척되지 못하거나 혹은 근거 법규들만 제정된 상태로 방치되고 있는 실태를 흔히 목격할 수 있었다. 이에 본 연구는 이러한 문제의 원인을 규명해 보고자 먼저 현재까지 제정된 셉테드 관련 법규—법률, 조례, 가이드라인 등— 의 내용을 조사하여 그 내용상의 미비점 또는 체계상 보완의 필요성 여부를 검토하고, 법규의 내용 상 문제점을 찾아내어 분석한 후, 그러한 결과를 기초로 향후 개선 방안을 제시하려 하였다. 본 연구 조사 결과, 현재 범죄예방 환경설계와 관련된 법규의 문제점들은 다음과 같은 세 가지의 공통적 요인으로 축약되었다. 첫째, 무엇보다 지나치게 물리적 개선에만 치중하도록 규정되었다는 점, 다시 말해 ‘사회적 환경’ 의 개선에 관한 내용이 법규에 반영된 바는 거의 전무한 상태라는 것, 둘째셉테드 관련 내용이 다양한 법규에 분절적으로 나뉘어 포함되어 있다는 점, 셋째로는 예산, 조직, 집행 및 추진 등에 대한 강제조항이 없어 셉테드 사업에 실효성 있는 동력을 제공하지 못하고 있다는 등으로 나타났다. 이러한 문제점을 개선하기 위한 방안으로 첫째, ‘범죄예방 환경설계 기본 법’ 및 시행령을 제정하고, 둘째, 동 기본법에 물리적 환경 개선뿐만 아니라 지역사회에서의 결속력 강화 등과 같은 사회적 환경의 개선과 관련되는 내용도 함께 명시되어야 할 것이며, 셋째, 관계 부처 간 및 다양한 이해관계 당사 자들의 통합적 접근이 가능할 수 있게 셉테드 기본법이 타 유관 법률에 우선 토록 조정하고, 넷째, 셉테드 정책의 내용, 절차, 예산, 추진 주체, 그리고 전문가 자문 등에 대한 강제성 있는 조항이 포함되어야 할 것임을 제언하였다. 마지막으로 해당 기본법에 포함되어야 할 것으로 판단되는 법제적 항목을 간략하게 제시해보았다. 본 연구를 기초로 해서 범죄예방 환경설계 관련 법규에 대한 전수 조사 및심층적 분석 연구가 진행되기를 바라며, 국내 범죄예방 환경설계 정책의 든든한 법률적⋅정책적 기초가 마련되기를 기대해본다. As the public attention to CPTED(Crime Prevention Through Environmental Design) has been on the rise for the past decade, the number of legislations for CPTED also have dramatically grown in South Korea. Several CPTED projects have been carried out in recent years, but outcomes and the maintenance of those projects have rarely kept for future reference. A major part of reasons for these problems is related to limitations in current rules and regulations for CPTED in South Korea. This study was purported to identify possible limitations and problems in the existing rules and regulations for CPTED and to provide future legislative directions to overcome those limitations and problems. Specifically, scrutinizing the existing laws, regulations, rules and guidelines for CPTED in South Korea, this study first identified that the existing laws have regulated only the aspects of physical improvement of CPTED in order for crime prevention. Second, relevant laws have not encompassed all of the major CPTED principles. Third, those laws in South Korea do not have mandatory provisions enforcing implementation of CPTED. To overcome those limitations, this study suggested the following legislative directions for the future of CPTED programs/projects in South Korea: First, ‘CPTED Act’ should be developed and enacted. Second, the Act should be intended to improve social cohesion and collective efficacy on top of physical improvement. Third, the Act should be prioritized than any other relevant laws and regulations in order to effectively implement multi-agency CPTED programs. Fourth, the Act should include mandatory guidelines for implementation procedure, contents, and practices. Lastly, this study provided a sample content for legislative directions for the ‘CPTED Act’.