• Transactions on Control, Automation and Systems Engineering
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• 제2권2호
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• pp.104-109
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• 2000

In this paper, the output feedback stabilizing problem is solved using any given state feedback control law. Compared to the linear systems is not so straightforward for nonlinear systems. We briefly explain the intrinsic obstructions for this problem and provide new output feedback scheme which achieves the semi-global stabilization with the high-gain state observer. THe overall uniform observability of the plant. Therefore, the result can be regarded as an extension of the separation principle for linear systems in some aspect.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
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• pp.539-543
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• 1990

In this paper, we present a method of parameterizing LQG which simultaneously stabilizes a set of plant model by employing the well known separation principle and Hurwith polynomial. A conditions for existence of simultaneously stabilizing LQG for, given set of plant is drived. We show that suggested parameterization achieves the closed loop stability by fixed LQG for given set of plant.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 C
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• pp.976-978
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• 1998

This paper presents the stability proof of a nonlinear feedback linearization-reduced order observer/sliding mode controller (NFL-ROO/SMC). The closed-loop stability is proved by a Lyapunov function candidate using an addition form of the sliding surface vector and the estimation error.

• Preventive Nutrition and Food Science
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• 제1권1호
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• pp.127-133
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• 1996

The development of high resolution capillary columns and a large variety of different detectors led to a strong position of gas chromatography in instrumental analysis. Every effort has been made to solve sophisticated separation problems by column switching. Nowadays, several systems are commercially available for this purpose. The principle and the capabilities of multidimensional gas chromatography(MDGC) are illustrated by different applications in the field of modern flavor and essential oil research.

• 대순사상논총
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• 제40집
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• pp.77-114
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• 2022

이 연구의 목적은 대한민국헌법에 구현된 법체계의 기본원리를 기준으로 『도헌』의 사상적 배경과 법률적 구성, 그리고 제도적 장치의 권력분립에 대해 분석하는 것이다. 『도헌』의 사상적 배경은 대순진리이다. 대순진리에는 선천의 상극적인 신의 의지로 인해 상극적인 자연법, 상극적인 자연 상태, 상극적인 인간으로 이루어진 진멸할 위기의 세상을 상제가 상생의 자연법, 상생의 자연 상태, 상생의 인간으로 개벽하는 우주 자연의 질서에 대한 패러다임의 전환이 설명되어 있다. 패러다임의 전환 시기 상제는 인간에게 상생적 인간이 되도록 신의 의지를 밝혔다. 따라서 『도헌』은 인간에게 부여된 상제의 의지를 도인의 사명으로 받아들여 실행하기 위한 '도인의 권리와 의무'에 기초한 근본규범이다. 『도헌』의 법률적 구성은 본문, 부록으로 되어 있고, 본문은 총칙, 도인의 권리와 의무, 연원, 제도적 장치로 구성되어 있다. 제도적 장치에는 중앙본부의 체계, 중앙종의회, 포정원, 정원, 종무원, 사업, 재정, 감사원, 도헌 개정 등으로 구성되어 있다. 『도헌』의 법률적 구성은 헌법의 법률 구성과 유사하다. 차이점은 헌법이 '최대권리 최소의 무의 원칙'이 적용된 데 반해 『도헌』에는 도인의 사명 완수를 위해 권리보다 의무가 더 많이 규정되어 있다. 『도헌』의 제도적 장치에는 권력분립의 원리가 적용되어 있다. 『도헌』상 중앙본부의 조직 형태는 도전의 별세 이전과 이후로 나누어서 살펴보았다. 도전의 별세 이전 중앙본부의 조직 형태는 입헌군주제와 유사하다. 『도헌』 상 도전의 별세 이후 중앙본부의 조직 형태는 의원내각제와 유사하다. 그리고 중앙본부의 기능 간 권력분립은 입법권(중앙종의회), 행정권(종무원), 사법권(감사원) 등 삼권분립의 원리이다. 중앙정부의 기능 내 권력분립은 첫째, 중앙종의회와 종무원 간에는 입법부 우위형(의회정부제), 둘째, 중앙종의회와 감사원 간에는 입법부 우위형(의회정부제), 셋째, 종무원과 감사원 간에는 사법부 우위형이다. 그리고 중앙본부와 방면 조직 간에는 수직적 권력분립의 원리가 작용하고 있다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.111-116
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• 2001

Waste office paper, photocopied or laser printed, has recently increased along with office automatization. In waste office paper, toner ink is used as the printing medium in place of conventional oil ink. Since toner ink cannot be saponificated by alkali and be decolored by bleaching, different from the case of oil ink, toner remains on regenerated paper as black specks. Although cascade recycling of waste office paper is compelled at present, the demand for low-grade paper is limited. From such circumstances, a new separation process for waste office paper is demanded to achieve parallel recycling. At the first stage of separation studies, the sharpness of separation is evaluated using small separators to obtain fundamental data. In a lab-scale separator, the sample amount of one feed is generally a few grams. However, the sample amount used for brightness, ERIC, and image analysis that are generally used to evaluate the efficiency of deinking are not small for lab-scale tests of these analyses. This paper describes an investigation of a sheet preparation method by a small amount of sample under 0.5g and compares the precision of toner content determination of spectroscopic analysis and image analysis from the viewpoint of separation evaluation. The easiness and convenience of the operation using only general-purpose equipments has also been set as a principle purpose. From the viewpoint of an analysis that yields high precision with a small amount of sample in short time, the method calculating the absorption coefficient from diffuse reflectance in the visible region is the most rational method in this study.

• 건축역사연구
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• 제14권3호
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• pp.53-76
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• 2005

Through a field study of the folk houses, 'Closed ㄱㄴ Type' in Goyang-si, Gyonggj-do, focused on the dweller's life by the method of ethnographic interview, observation, and physical survey. L and opposite L type of inner and outer buildings form a closed inner court, and innermost backyard for woman is enclosed by fence. Form and space of the house contains dweller's traditional life. Outer space of a front gate becomes semiprivate space, for thrashing and piling up harvest and raising vegetables and pigs. Confucius principle does not fully dominate dweller's life of ancestral rite at Daecheong floor, and separation of man's and woman's quarter. Superstitious worship activities took place for lord of site and house. In everyday life, Anbang, inner main room, is assigned for parent's quarter instead of woman's quarter, and Geornbang, next room, was for son's family. Anbang has symbolic meaning for a place of deathbed. House contains agricultural activities, crop harvesting, thrashing, putting into storage, hulling rice, and keeping grain near kitchen. At present, rooms are needed more; sheds are made into rooms, rooms are enlarged toward outside, half outside space like Daechong floor becomes interior space by sash screen. And modern facilities of kitchen and bathroom are equipped for convenience. At the end, meaning and generative principle of those forms are discovered.

• Computers and Concrete
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• 제14권1호
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• pp.91-107
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• 2014

Using the principle of damage mechanics, zero-thickness pore pressure cohesive elements (PPCE) are used to simulate the casing-cement interface (CCI) and cement-rock interface (CRI). The traction-separation law describes the emergence and propagation of the PPCE. Mohr-coulomb criteria determines the elastic and plastic condition of cement sheath and rock. The finite element model (FEM) of delamination fractures emergence and propagation along the casing-cement-rock (CCR) interfaces during hydraulic fracturing is established, and the emergence and propagation of fractures along the wellbore axial and circumferential direction are simulated. Regadless of the perforation angle (the angle between the perforation and the max. horizontal principle stress), mirco-annulus will be produced alonge the wellbore circumferential direction when the cementation strength of the CCI and the CRI is less than the rock tensile strength; the delamination fractures are hard to propagate along the horizontal wellbore axial direction; emergence and propagation of delamination fractures are most likely produced on the shallow formation when the in-situ stresses are lower; the failure mode of cement sheath in the deep well is mainly interfaces seperation and body damange caused by cement expansion and contraction, or pressure testing and well shut-in operations.

• Environmental Analysis Health and Toxicology
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• 제29권
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• pp.16.1-16.9
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• 2014

Objectives Rapid increase in engineered nanoparticles (ENPs) in many goods has raised significant concern about their environmental safety. Proper methodologies are therefore needed to conduct toxicity and exposure assessment of nanoparticles in the environment. This study reviews several analytical techniques for nanoparticles and summarizes their principles, advantages and disadvantages, reviews the state of the art, and offers the perspectives of nanometrology in relation to ENP studies. Methods Nanometrology is divided into five techniques with regard to the instrumental principle: microscopy, light scattering, spectroscopy, separation, and single particle inductively coupled plasma-mass spectrometry. Results Each analytical method has its own drawbacks, such as detection limit, ability to quantify or qualify ENPs, and matrix effects. More than two different analytical methods should be used to better characterize ENPs. Conclusions In characterizing ENPs, the researchers should understand the nanometrology and its demerits, as well as its merits, to properly interpret their experimental results. Challenges lie in the nanometrology and pretreatment of ENPs from various matrices; in the extraction without dissolution or aggregation, and concentration of ENPs to satisfy the instrumental detection limit.

• 정보처리학회논문지C
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• 제13C권6호
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• pp.725-732
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• 2006

역할 기반 접근 제어(Role-Based Access Control)은 역할 계층 구조에서 역할 상속과 의무 분리 등을 제공하여 접근제어의 관리를 쉽게 하는 장점이 있다. 그러나 RBAC은 실 세계에서 빈번하게 이루어지는 권한의 위임을 효율적으로 처리하지 못 한다. 본 논문에서는 위임된 권한의 영속성을 보장하고 최소 권한의 보안 원칙과 의무분리 원칙에 위배되지 않는 향상된 권한 위임 모델(APBDM)을 제안한다. APBDM은 RBAC96을 바탕으로 하며, 사용자 대 사용자, 역할 대 역할의 위임을 제공한다. 위임자는 원하는 권한을 특정인에게 부여 할 수 있고, 위임자가 원하는 시점에서 권한이 회수 될 수 있다. 본 논문에서는 APBDM을 분석하고 이의 유효성을 입증하였다.