• 한국도서관정보학회지
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• 제53권2호
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• pp.355-375
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• 2022

이 연구에서는 FR 모형과 LRM을 개체, 속성, 관계 측면에서 비교 분석하여 목록 관련 표준 및 개별 시스템에서 LRM을 수용할 수 있도록 LRM 특성과 그 적용방안을 모색하고자 한다. LRM 특성에 따른 적용방안으로 다음을 제시하였다. 첫째, LRM에서 가족, 단체, 식별자, 전거형접근점, 개념, 대상, 사건, 기관, 규칙의 개체가 삭제되었지만, LRM을 적용하려는 표준과 시스템에서 필요시 하위 개체를 정의하여 개체를 확장해야 한다. 둘째, 링크드데이터를 위해 LRM에서는 속성 요소가 관계로 변경되면서 속성이 많이 감소하였으나, LRM을 수용하려는 표준과 시스템에서는 속성을 세분하여 확장해야 한다. 특히, LRM에서는 유사한 기능을 갖거나 여러 개체에서 반복되는 속성과 자료에 특화된 속성이 포괄적인 일반화된 속성명으로 통합되었기 때문에 표준 및 개별 시스템에서는 보다 구체적이고 세부적인 속성명을 명확하게 제시해야 하며, 속성에 해당하는 어휘인코딩스킴도 개발되어야 한다. 셋째, 관계가 속성에 비해서는 증가되었으나 관계 자체가 추상적이기 때문에, 관계는 세목화 및 다단계 관계를 통해 관계가 확장되어야 한다. 본 연구는 목록 관련 표준 및 시스템에서 LRM을 적용하는 경우 적용방안 모색에 활용될 수 있을 것이다.

• 대한공업교육학회지
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• 제42권1호
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• pp.68-86
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• 2017

본 연구의 목적은 2015 개정 교육과정에 따라 고등학교 진로선택 교과로 도입된 '지식 재산 일반' 교과의 안정적인 정착과 이를 지원하기 위한 전략을 모색하는 것으로써, 고등학교 관리자와 관련 교사들이 '지식 재산 일반' 교과의 도입과 활용에 대해 어떻게 인식하고 있는지를 비교하였다. 조사도구는 연구진이 개발한 뒤 발명교육 전문가 2인의 내용검토 후 최종 설문지로 완성되었다. 설문조사는 2016년 12월 1개월 간 한국발명진흥회에서 주관하는 직무연수 과정에 참여한 115명의 학교 관리자들과 교사들을 대상으로 실시하였으며, 최종적으로 자료 분석에 사용된 사례 수는 95개였다. 자료의 분석에는 SPSS 22.0K를 활용하였다. 연구의 통계처리 유의수준은 5%로 설정하였다. 이 연구의 결과를 요약 및 정리하면 다음과 같다. 첫째, '지식 재산 일반' 교과의 교육과정 내용과 '지식 재산 교과'의 필요 인식에서는 연수 참여자 모두가 보통 수준의 인식을 갖고 있었다. 둘째, '지식 재산 일반' 교과의 활용에 대해서는 연수 참여자 모두가 보통 이상의 인식을 갖고 있었으며, '지식 재산 일반' 교과의 성공적 정착을 위한 전략은 높은 정도의 인식을 갖고 있었다. 셋째, '지식 재산 일반' 교과의 교육과정 인식에서는 교사의 인식수준이 관리자보다 통계적으로 유의한 수준에서 높게 나타났으며, '지식 재산 일반' 교과의 필요에 대한 인식에서는 교내 활동의 활성화에 대해서만 인식의 차이가 있는 것으로 나타났다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 가을 학술발표회 논문집
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• pp.147-152
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• 1999

Distribution of fracture system is an important factor to analyse instability of jointed rock slope. In the most case of rock slopes, joint distribution properties are related to potential, shape, size and locality of slope failure. The purpose of this paper is to present an application of fracture characterization related to rock slope failure. Fracture data used in this study are collected by scanline survey. Two aspects of fracture characterization for rock slope are handled in this study First, In order to determine the potential and shape of slope failure, trace length of joints is considered as the weighting factor about collected orientation data. Second, Relationship between trace length and spacing is analysed to estimate failure location and size. The distribution of fracture system is directly influenced on wedge failure. It is effective to analyse the orientation of fractures by using weighting factors associated with the trace length of fractures rather than to analyse only that of fractures. It gives a conclusion that the wedge failure occurred along the peak of fracture density(or intensity) cycles.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제23권1호
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• pp.13-19
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• 2016

In this paper, we study some characterizations of unbounded domains. Among these, so-called G-domain is introduced by Cabre for the Aleksandrov-Bakelman-Pucci maximum principle of second order linear elliptic operator in a non-divergence form. This domain is generalized to wG-domain by Vitolo for the maximum principle of an unbounded domain, which contains G-domain. We study the properties of these domains and compare some other characterizations. We prove that sA-domain is wG-domain, but using the Cantor set, we are able to construct a example which is wG-domain but not sA-domain.

• 제어로봇시스템학회논문지
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• 제9권6호
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• pp.425-434
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• 2003

The disturbance observer(DOB) has been widely used in high speed and high precision motion control applications and the characteristics of DOB have been investigated in depth. Though most of DOB's have been implemented as the discrete-time form in digital devices, we are still short of the researches on discrete-time DOB (DDOB) in spite of rich references on continuous-time DOB. In this paper, we discuss about the disturbance rejection property and measurement noise effect of discrete-time DOB. Especially, we will focus on revealing the role of sampling time in designing the discrete-time DOB and show the validity of analysis through simulations and experiments for optical disk drive systems.

• 대한수학회보
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• 제34권2호
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• pp.273-285
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• 1997

The aim of this paper is to present theorems on the exitence of zeros for mappings defined on convex subsets of topological vector spaces with values in a vector space. In addition to natural assumptions of continuity, convexity, and compactness, the mappings are subject to some geometric conditions. In the first theorem, the mapping satisfies a "Darboux-type" property expressed in terms of an auxiliary numerical function. Typically, this functions is, in this case, related to an order structure on the target space. We derive an existence theorem for "obtuse" quasiconvex mappings with values in an ordered vector space. In the second theorem, we prove the existence of a "common zero" for an arbitrary (not necessarily countable) family of mappings satisfying a general "inwardness" condition againg expressed in terms of numerical functions (these numerical functions could be duality pairings (more generally, bilinear forms)). Our inwardness condition encompasses classical inwardness conditions of Leray-Schauder, Altman, or Bergman-Halpern types.

• 한국생산제조학회지
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• 제6권3호
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• pp.73-81
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• 1997

This study was to find the best adhesive condition comparing mechanical property in case of hot-melt adhesion using glue-gun, ultrasonic welding with adhesion and only ultrasonic welding in order to adhere thermoplastic resin of polyethylene (PE) in which reliable adhesion was resulted in case of ultrasonic welding with same materials of PE. The best welding condition were acquired at welding time 1 second, welding pressure 250kPa for PE-PE where welding time and welding pressure were increased in accordance with the increase of material strength. At the best ultrasonic welding conditions, bonding strength of PE-PE welding was about 21MPa of which material have tensile strength of 24MPa. Through the analysis of microscophic test for ultrasonic welding structure, it was distinguished between well welded structure with higher intermolecule flow and bad welded structure with lower flow, of which result is mostly correspond with the result of tensile strength test.

• Management Science and Financial Engineering
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• 제12권2호
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• pp.19-35
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• 2006

We use the hierarchical Bayesian approach to describe the transition probabilities of a binary nonhomogeneous Markov chain. The Markov chain is used for describing the transition behavior of emotionally disturbed children in a treatment program. The effects of covariates on transition probabilities are assessed using a logit link function. To describe the time evolution of transition probabilities, we consider two modeling strategies. The first strategy is based on the concept of exchangeabiligy, whereas the second one is based on a first order Markov property. The deviance information criterion (DIC) measure is used to compare models with two different time dependent structures. The inferences are made using the Markov chain Monte Carlo technique. The developed methodology is applied to some real data.

• 대한수학회보
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• 제54권3호
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• pp.993-1002
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• 2017

Let ${\Omega}$ be a bounded, uniformly totally pseudoconvex domain in ${\mathbb{C}}^2$ with the smooth boundary b${\Omega}$. Assuming that ${\Omega}$ satisfies the negative ${\bar{\partial}}$ property. Let M be a positive, finite area divisor of ${\Omega}$. In this paper, we will prove that: if ${\Omega}$ admits a maximal type F and the ${\check{C}}eck$ cohomology class of the second order vanishes in ${\Omega}$, there is a bounded holomorphic function in ${\Omega}$ such that its zero set is M. The proof is based on the method given by Shaw [27].

• 한국경영과학회지
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• 제32권3호
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• pp.17-31
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• 2007

In this paper, we consider a service system with bi-functional servers, which can switch between the primary service room and the secondary room. A service policy is characterized by the switching paints which depend on the queue length in the primary service room and the service level requirement constraint of the secondary room. The primary service room is modeled as a Markovian queueing system and the throughput of the primary service room is function of the total number of bi-functional servers. the buffer capacity of the primary service room, and the service policy. There is a revenue obtained from throughput and costs due to servers and buffers. We study the problem of simuitaneously determining the optimal number of servers, buffer capacity, and service policy to maximize profit of the service system, and develop an algorithm which can be successfully applied with the small number of computations.