ROBUST CONTROLLER DESIGN FOR IMPROVING VEHICLE ROLL CONTROL

Du, H.,Zhang, N The Korean Society of Automotive Engineers 2007 International journal of automotive technology Vol.8 No.4

This paper presents a robust controller design approach for improving vehicle dynamic roll motion performance and guaranteeing the closed-loop system stability in spite of vehicle parameter variations resulting from aging elements, loading patterns, and driving conditions, etc. The designed controller is linear parameter-varying (LPV) in terms of the time-varying parameters; its control objective is to minimise the $H_{\infty}$ performance from the steering input to the roll angle while satisfying the closed-loop pole placement constraint such that the optimal dynamic roll motion performance is achieved and robust stability is guaranteed. The sufficient conditions for designing such a controller are given as a finite number of linear matrix inequalities (LMIs). Numerical simulation using the three-degree-of-freedom (3-DOF) yaw-roll vehicle model is presented. It shows that the designed controller can effectively improve the vehicle dynamic roll angle response during J-turn or fishhook maneuver when the vehicle's forward velocity and the roll stiffness are varied significantly.

THE IMPACT OF GENERATION Y MONEY ATTITUDES ON COMPULSIVE BUYING: CONTINGENCY EFFECTS OF CHILDHOOD FAMILY RESOURCES AND GENDER

Duh Helen Inseng,Thorsten Teichert 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7

Research findings show that money attitude dimensions variedly affect compulsive buying. We surveyed 750 Generation Y South Africans to examine whether gender and family resources received during childhood is influencing the varied impact of money attitude dimensions on compulsive buying. Depending on whether low or high family resources were received during childhood, we found gender differences and a similarity on how money attitude dimensions affect compulsive buying. In terms of similarity, we found that high provision of both tangible and intangible family resources during childhood promotes the development of budget money attitude, which negatively affects the development of compulsive buying behavior.

Identification of Topological Entities and Naming Mapping for Parametric CAD Model Exchanges

Mun, Duh-Wan,Han, Soon-Hung Society for Computational Design and Engineering 2005 International Journal of CAD/CAM Vol.5 No.1

As collaborative design and configuration design gain increasing importance in product development, it becomes essential to exchange parametric CAD models among participants. Parametric CAD models can be represented and exchanged in the form of a macro file or a part file that contains the modeling history of a product. The modeling history of a parametric CAD model contains feature specifications and each feature has selection information that records the name of the referenced topological entities. Translating this selection information requires solving the problems of how to identify the referenced topological entities of a feature (persistent naming problem) and how to convert the selection information into the format of the receiving CAD system (naming mapping problem). The present paper introduces the problem of exchanging parametric CAD models and proposes a solution to naming mapping.

Plato's Criticism of Rhetoric in the Gorgias

Nam Duh Kim,Jae Hong Kim(토론자) 한국수사학회 2006 한국수사학회 학술대회 Vol.- No.-

Chapter 11 : Justice in Plato's Republic Ⅳ

Nam-Duh Kim 한국철학회 2008 Philosophy and Culture Vol.4 No.-

ASPECTS OF CELEBRITY ENDORSEMENTS AND BRAND VALUES INFLUENCING YOUNG ADULTS’ ATTITUDE AND PURCHASE INTENTION OF COSMETICS BRANDS IN SOUTH AFRICA

Helen Duh Inseng,Banqobile Tshabalala 글로벌지식마케팅경영학회 2019 Global Fashion Management Conference Vol.2019 No.07

Ultrasound Image Enhancement Based on Automatic Time Gain Compensation and Dynamic Range Control

Lee, Duh-Goon,Kim, Yong-Sun,Ra, Jong-Beom The Korean Society of Medical and Biological Engin 2007 의공학회지 Vol.28 No.2

For efficient and accurate diagnosis of ultrasound images, appropriate time gain compensation(TGC) and dynamic range(DR) control of ultrasound echo signals are important. TGC is used for compensating the attenuation of ultrasound echo signals along the depth, and DR controls the image contrast. In recent ultrasound systems, these two factors are automatically set by a system and/or manually adjusted by an operator to obtain the desired image quality on the screen. In this paper, we propose an algorithm to find the optimized parameter values far TGC and DR automatically. In TGC optimization, we determine the degree of attenuation compensation along the depth by dividing an image into vertical strips and reliably estimating the attenuation characteristic of ultrasound signals. For DR optimization, we define a novel cost function by properly using the characteristics of ultrasound images. We obtain experimental results by applying the proposed algorithm to a real ultrasound(US) imaging system. The results verify that the proposed algorithm automatically sets values of TGC and DR in real-time such that the subjective quality of the enhanced ultrasound images may be sufficiently high for efficient and accurate diagnosis.

Strategies for finding the adequate air void threshold value in computer assisted determination of air void characteristics in hardened concrete

David Duh,Roko Žarnic,Violeta Bokan-Bosiljkov 사단법인 한국계산역학회 2008 Computers and Concrete, An International Journal Vol.5 No.2

The microscopic determination of air void characteristics in hardened concrete, defined in EN 480-11 as the linear-traverse method, is an extremely time-consuming and tedious task. Over past decades, several researchers have proposed relatively expensive mechanical automated systems which could replace the human operator in this procedure. Recently, the appearance of new high-resolution flatbed scanners has made it possible for the procedure to be automated in a fully-computerized and thus cost-effective way. The results of our work indicate the high sensitivity of such image analysis automated systems firstly to the quality of sample surface preparation, secondly to the selection of the air void threshold value, and finally to the selection of the probe system. However, it can be concluded that in case of careful validation and the use of the approach which is proposed in the paper, such automated systems can give very good estimate of the air void system parameters, defined in EN 480-11. The amount of time saved by using such a procedure is immense, and there is also the possibility of using alternative stereological methods to assess other, perhaps also important, characteristics of air void system in hardened concrete.

플라톤의 정치철학에서 정치적 지식의 성격(1)

김남두(Nam Duh Kim) 한국서양고전학회 2014 西洋古典學硏究 Vol.53 No.1

이 글은 『국가』4-6권을 중심으로 플라톤에서 정치적 지식의 성격을 논의한다. 정치적 지식이라는 말은 이 저술에서 플라톤에 의해 직접 사용되는 개념은 아니며 이 개념 자체가 논의를 통해 규정되어야 할 개념이다. 논문의 검토 작업은 결론적으로 다음의 세 주장으로 요약될 수 있다: 1) 사안에 관한 숙고를 통해 가능한 정치적 지혜는 정치공동체에 부분적으로가 아니라 전체적으로 관련될 때에만 성립한다. 정치적 지혜의 전체성은 다른 지식들이 그 지식의 고유 영역에 대해 가지는 전체성과 본질적인 차이가 없다. 정치적 지식이 여타 지식에 대해 전체성과 그에 따른 우위를 주장할 수 있는 것은 오로지 정치공동체에 관해서이며 이 경우에만 타당하다. 2)『국가』의 대화자들이 그리는 정치공동체는 공동체 구성원 전체의 행복을 추구한다. 농부, 목수, 옷만드는 이, 구두수선공의 네 사람의 최초공동체에서 이루어지는 노동의 분업에 관한 결정은 공동체 구성원 전체에 공히 좋음을 위한다는 원칙 아래 이루어진 것인 만큼 단순히 경제적 효율의 결정이 아니라 공동체 전체를 고려하는 정치적인 결정이다. 구성원 전체의 행복이라는 사상할 수 없는 목표를 가지는 정치공동체의 전체성은 바로 공동체 구성원 전체의 행복을 비켜갈 수 없다는 점에서 단순히 형식적 전체성이 아니라 실질 내용의 충족을 요구하는 실질적 전체성이다. 3) 정치적 앎의 성격에 대한 플라톤의 이런 입장은 정치 공동체의 좋음의 추구가 투명한 지적 근거제시의 과정을 통해 모두에게 말을 통해 접근 가능한 것이라는 합리적 정치과정의 꿈을 제시하는 것이다. 태양에 비유된 좋음의 이데아는 빛이 모든 것을 밝히 드러내고 가시세계의 모습을 모두에게 공유 가능한 것으로 보여주듯이, 萬有가 질서 지어진 것이며, 이렇게 질서 지어진 可知界의 진상이 로고스를 통해 드러나고, 변증과정을 통해 로고스에 참여하는 모두에게 접근 가능한 것이라는 비전을 제시한다. 아울러 철학적 지식과 정치적 지식의 결합이 정치적 지식의 궁극적 정초가능성을 뜻하는 것이라면, 이런 의미에서의 정치적 지식의 전체성은 여타 지식의 전체성과 구분되는 궁극적 전체성의 요구를 담는다. This paper aims to clarify Plato’s idea of political knowledge in connection with some passages in Republic. I make the following three claims: 1) The wholeness claim of political wisdom that it does not deliberate about some particular thing in the city, but about the city as a whole, is not a special feature of political wisdom. Every knowledge deliberates about the matter it concerns as a whole. Thus, in this respect, there is no difference between the political knowledge and other kinds of knowledge. The wholeness claim of political knowledge and its superior position over other knowledge can maintain its validity only in connection with matters on the polis. 2) Plato’s city aims for the happiness of the whole member of the city. That the whole citizen, not merely some part of it, must be happy in the city constitutes a substantial goal of the city and consequently provides a substantial guideline for political knowledge of Plato’s city. 3) Plato’s position that the political power and philosophy must be throughly blended together for the realization of the kallipolis assumes that the political knowledge must be philosophical. Philosophical knowledge culminates, according to Plato, in the the?ria of the idea of the Good. The idea of the Good confers political knowledge the ultimate foundation on which the philosopher king can ground and explain the goodness of laws and decisions he makes. Founding the polis on the knowledge of the idea of the Good, Plato gives us at the same time the vision that the political procedure, laws and institutions of the polis can be accounted scientifically and everybody can have access on this rational account, in so far as he is ready to participate in the common dialectical research.

SOCIAL MEDIA PLATFORMS IGNITING COSMETICS INTEREST AMONG FEMALE GENERATION Y SOUTH AFRICANS

Helen Inseng Duh,Ashley Biack 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07