• 대한수학교육학회지:학교수학
• /
• 제4권3호
• /
• pp.463-481
• /
• 2002

In this paper, I review the historical background of "the principle of the permanence of equivalent forms" and sum- marize properties of "the principle of the permanence of equivalent forms" as a kind of heuristic. 1 think that "the principle of the permanence of equivalent forms" can be used effectively for student's discovery of the algebraic structure. There are three ways of using "the principle of the permanence of equivalent forms" in extending number system - an extension on the base of set theory(SMSC), the formal or axiomatic extrapolation and the inductive-extrapolatory method. All those three methods are mixed up and being used potentially at various levels in current Korean text books. "The principle of the permanence of equivalent forms" is used most effectively in the subject of the exponent. 1 try to present a situation that makes the students find more general definition and cultivate their desirable attitudes for the mathematics in the process of extending the exponent through summarizing the debate between Goel & Robillard(1997) and Tirosh S, Even(1997).

• 펄프종이기술
• /
• 제40권2호
• /
• pp.73-79
• /
• 2008

The permanence is of great importance to library and archival paper. According to the established standardizations including ISO and ANSI, the permanence can be specified with tear strength, pH, alkali reserve and kappa number. In this study, we evaluated the permanence and durability of domestic coated and copy paper grades. Two types of coated paper grades and all kinds of copy papers which were tested in this study were satisfied with the criterion of permanence specification. However, all of the tested paper grades didn't meet the requirements of durability because of their low folding endurance.

• 한국프랜차이즈경영연구
• /
• 제14권3호
• /
• pp.37-52
• /
• 2023

Purpose: This study is to investigate the causal relationship between franchise headquarters' franchise cost and franchise satisfaction and management performance, and to verify the structural relationship between franchise cost and corporate permanence. Research design, data and methodology: The data were collected from 200 medium-sized franchisees in Seoul and analyzed using confirmatory factor analysis (CFA) to test the validity of the measurement model and the structural equation model (SEM) to identify the impact of franchise costs on corporate performance with the Amos 28.0 program. Result: Franchise costs were found to have a negative effect on franchise satisfaction and corporate permanence. It was confirmed that franchise satisfaction had a significant positive effect on management performance and corporate permanence. Franchise costs had a sequential mediating effect on franchise satisfaction and management performance, which had a significant impact on corporate permanence. Conclusions: This study expanded the theoretical scope by applying the expectation confirmation theory to corporate transactions. In addition, the franchise headquarters proposes ways to create a culture of franchise business with trust by presenting appropriate franchise costs to improve management performance and corporate permanence through franchise satisfaction.

• Journal of applied mathematics & informatics
• /
• 제31권1_2호
• /
• pp.247-262
• /
• 2013

In this paper, using the time scale calculus theory, we first discuss the permanence of a $n$-species competition system with feedback control on time scales. Based on the permanence result, by the Lyapunov functional method, we establish sufficient conditions for the existence and uniformly asymptotical stability of almost periodic solutions of the considered model. The results of this paper is completely new. An example is employed to show the feasibility of our main result.

• 대한수학회보
• /
• 제52권4호
• /
• pp.1069-1076
• /
• 2015

In this paper, a two species competitive model with stage structure and harvesting is investigated. By using the differential inequality theory, some new sufficient conditions which ensure the permanence of the system are established. Our result supplements the main results of Song and Chen [Global asymptotic stability of a two species competitive system with stage structure and harvesting, Commun. Nonlinear Sci. Numer. Simul. 19 (2001), 81-87].

• Journal of applied mathematics & informatics
• /
• 제27권5_6호
• /
• pp.1097-1107
• /
• 2009

In this paper, three species stage-structured predator-prey model with time delayed and periodic constant impulsive perturbations of predator at fixed times is proposed and investigated. We show that the conditions for the global attractivity of prey(pest)-extinction periodic solution and permanence of the system. Our model exhibits a new modelling method which is applied to investigate impulsive delay differential equations. Our results give some reasonable suggestions for pest management.

• Kyungpook Mathematical Journal
• /
• 제49권4호
• /
• pp.763-770
• /
• 2009

We investigate the dynamical properties of a Holling type I predator-prey model, which harvests both prey and predator and stock predator impulsively. By using the Floquet theory and small amplitude perturbation method we prove that there exists a stable prey-extermination solution when the impulsive period is less than some critical value, which implies that the model could be extinct under some conditions. Moreover, we give a sufficient condition for the permanence of the model.

• 한국산림과학회지
• /
• 제101권1호
• /
• pp.83-90
• /
• 2012

산림은 온실가스의 흡수원이자 배출원으로 지구 기후완화에 중요한 역할을 하고 있다. 산림탄소 상쇄사업으로 발생하는 배출권의 신뢰성을 높이기 위해서는 비영속성(non-permanence) 문제를 현실적으로 해결하여야 한다. 본 연구는 주요 산림탄소 상쇄표준에서 적용하고 있는 비영속성 처리 방법을 분석하고 국내 산림탄소 상쇄제도에 적용 가능한 비영속성 문제 해결 방안으로 버퍼 제도의 도입을 제안하였다. 버퍼 제도는 주요 산림탄소 상쇄제도에서 비영속성을 처리하는 일반적인 방안일 뿐만 아니라 우리나라의 전문가 역시 가장 선호하는 방안이었다. 따라서 국내산림탄소 상쇄제도의 영속성 보장 조치로 버퍼제도의 도입 및 운영을 우선적으로 고려해야 한다. 기타 적용 가능한 방법으로는 산림인증제, 보전지역권, 산림보전 의무기간의 장기화 등을 고려할 수 있다. 산주들의 참여와 배출권의 영속성을 보장하기 위하여 산림사업별 위험도를 표준화하고 위험도에 따라 버퍼 양을 차등화하는 표준개발이 뒤따라야 한다.

• 한국산업정보학회논문지
• /
• 제24권5호
• /
• pp.77-93
• /
• 2019

본 논문은 조직브랜드 내부화가 조직브랜드 영속성에 미치는 영향력을 연구하였다. 구체적으로 조직브랜드 내부화가 고객지향성, 브랜드애착, 조직브랜드 영속성에 어떠한 경로로 영향을 미치는지를 살펴보았다. 또한 고객지향성과 조직브랜드 영속성 간의 관계에 있어서 브랜드애착의 효과도 함께 검토하였다. 실증적 연구 결과, 조직브랜드 내부화는 종업원의 브랜드에 대한 애착을 높이고 고객과의 관계를 긍정적으로 형성하는데 중요한 역할을 하는 것으로 나타났다. 즉, 브랜드애착이 높아질수록 조직 내 직원들은 고객의 니즈를 잘 인지하고 공유함으로써 조직의 장기적인 발전을 위한 핵심역량을 제공한다. 따라서 기업들은 브랜드를 단일된 컨셉으로 잘 조직화함으로써 내부 브랜드 파워를 강화하고, 이를 기반으로 직원의 조직적 통합화를 실현할 필요가 있다. 끝으로, 본 연구는 이 같은 관점에서 실무적 시사점과 향후 연구방향을 제안하였다.

• Kyungpook Mathematical Journal
• /
• 제48권3호
• /
• pp.503-514
• /
• 2008

We investigate a three-species food chain system with Lotka-Volterra functional response and impulsive perturbations. In [23], Zhang and Chen have studied the system. They have given conditions for extinction of lowest-level prey and top predator and considered the local stability of lower-level prey and top predator eradication periodic solution. However, they did not give a condition for permanence, which is one of important facts in population dynamics. In this paper, we establish the condition for permanence of the three-species food chain system with impulsive perturbations. In addition, we give some numerical examples.