• 한국안전학회지
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• 제20권2호
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• pp.162-168
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• 2005

노말프로판올과 노말데칸의 가연성혼합물의 하부인화점을 Tag개방식 장치를 이용하여 측정하였다. 실험결과 인화점과 조성의 관계에서 혼합물 보다 낮은 인화점을 보여주었다. 노말 프로판올의 몰분율 0.71에서 $27^{\circ}C$였으며, 노말프로판올의 인화점은 $28^{\circ}C$였다. 실험 결과는 이상용액을 근거로 한 예측 값과 활동도계수 예측식인 van Laar식을 사용하여 계산된 값을 각각 비교하였다. 이상용액 개념을 이용한 예측 값은 실험 값과 차이를 보였으나, van Laar 식에 의한 예측 값은 실험 값과 일치하였으며, van Laar식에 의한 예측 값과 실험 값은 평균 $0.83^{\circ}C$차이를 보였다. 본 연구에서 제시된 방법론은 가연성물질에 대해 안전한 저장 및 취급하는 조건의 결정과 같은 화학공정 설계의 본질적 안전 설계에 적용할 수 있다.

• 한국식품과학회지
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• 제22권5호
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• pp.575-581
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• 1990

일정한 열처리 공정에 대해 Equivalent point가 존재함을 이상적인 두가지의 직접가열곡선 즉, $120^{\circ}C$에서 10분간 $135^{\circ}C$에서 10초간의 등온가열 곡선을 이용하여 예시하였다. 이러한 조건하에서 Arrhe nius model을 적용한 경우 임의의 Ea-값을 사용하여 G-값을 결정하고 Bigelow model을 적용한 경우, 임의의 z-값을 사용하여 F-값을 결정하였다. 이들 값을 사용하여 Equivalent time과 Equivalent Temperature를 두가지 방법 즉, 직교좌표법과 회기분석법에 의해 결정하였다. 이들 두 방법에 의해 결정된 Equivalent Point는 서로 일치하였으며 각각의 값은 초기에 가정했던 직접가열곡선의 가열시간 및 온도와 일치하였다.

• 호남수학학술지
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• 제39권4호
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• pp.527-559
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• 2017

The main motivation of this article is to generalized the concept of fuzzy ideals, (${\alpha},{\beta}$)-fuzzy ideals, (${\in},{\in}{\vee}q_k$)-fuzzy ideals of semigroups. By using the concept of $q^{\delta}_K$-quasi-coincident of a fuzzy point with a fuzzy set, we introduce the notions of (${\in},{\in}{\vee}q^{\delta}_k$)-fuzzy left ideal, (${\in},{\in}{\vee}q^{\delta}_k$)-fuzzy right ideal of a semigroup. Special sets, so called $Q^{\delta}_k$-set and $[{\lambda}^{\delta}_k]_t$-set, condition for the $Q^{\delta}_k$-set and $[{\lambda}^{\delta}_k]_t$-set-set to be left (resp. right) ideals are considered. We finally characterize different classes of semigroups (regular, left weakly regular, right weakly regular) in term of (${\in},{\in}{\vee}q^{\delta}_k$)-fuzzy left ideal, (${\in},{\in}{\vee}q^{\delta}_k$)-fuzzy right ideal and (${\in},{\in}{\vee}q^{\delta}_k$)-fuzzy ideal of semigroup S.

• 한국의류학회지
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• 제39권6호
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• pp.867-876
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• 2015

This research studies socio-cultural hegemony change focused on male society through contemporary ideal masculine images of Asian men (especially Korean and Chinese men). Participants were: South Korean men in and around Seoul and Chinese men in Beijing and Shanghai. The youngest survey participants in their 20's and the oldest in their 40's were asked about their present men's appearance images and masculinity as well as asked to evaluate satisfaction with their own style, and interest in fashion trends on a 5-point Likert scale. In this research, an ideal masculinity was tested by 6 characters (traditional masculinity, macho masculinity, androgynous masculinity, adolescent masculinity, trendy masculinity, and general masculinity) as male avatars. Asian men's consciousness of an ideal masculinity image has moved gradually from traditional masculinity to trendy masculinity, leading to new roles in a socio-cultural agenda. Korean and Chinese men are more interested in appearance and notice fashionable styles to be trendy that follow the latest fashion because most other Asian men reflect a traditional masculinity as an ideal appearance image.

• Kyungpook Mathematical Journal
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• 제45권1호
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• pp.115-121
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• 2005

Using the concept of fuzzy points, the notions of fuzzy point BCC-(sub) algebras, quasi BCC-(sub)algebras and quasi BCC-ideals are introduced. Some characterizations of them are discussed.

• Journal of Power Electronics
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• 제17권5호
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• pp.1268-1277
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• 2017

Three-phase pulse width modulation (PWM) rectifiers are usually designed under the assumption of ideal ac power supply and input inductance. However, non-ideal circuit parameters may lead to a voltage collapse of PWM rectifiers. This paper investigates the mechanism of voltage collapse in three-phase PWM rectifiers. An analytical stability boundary expression is derived by analyzing the equilibrium point of the averaging state space model, which can not only accurately locate the voltage collapse boundary in the circuit parameter domain, but also reveal the essential characteristic of the voltage collapse. Results are obtained and compared with those of the trial-error method and the Jacobian method. Based on the analysis results, the system parameters can be divided into two categories. One of these categories affects the critical point, and other affects only the instability process. Furthermore, an effective control strategy is proposed to prevent a vulnerable system from being driven into the instability region. The analysis results are verified by the experiments.

• 대한수학회보
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• 제61권3호
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• pp.735-744
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• 2024

In this note, we shed new light on Krull domains from the point view of Gorenstein homological algebra. By using the so-called w-operation, we show that an integral domain R is Krull if and only if for any nonzero proper w-ideal I, the Gorenstein global dimension of the w-factor ring (R/I)_w is zero. Further, we obtain that an integral domain R is Dedekind if and only if for any nonzero proper ideal I, the Gorenstein global dimension of the factor ring R/I is zero.

• 한국식생활문화학회지
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• 제31권2호
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• pp.121-130
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• 2016

This study attempted to understand the fast food brand personality in the domestic dining market to present the repositioning strategies within the competitive market. Positive analysis results were as follows. First, the five brand individualities of 'familiarity', 'passion', 'professionalism', 'reliability', and 'refinement' were derived. Second, the deductions made on perceptions of the population using a Biplot based on the brand personality showed that there were significant differences among the brand personality images of the brands, which were the targets of comparison. Third, there were significant between-group differences in the comparisons of perception among the subgroups according to gender, brand reliability, and brand satisfaction. Fourth, there were significant between-group differences in the consumer fast food brand preferences and ideal point. Such studies can provide information useful for establishing marketing differentiating strategies by grasping the brand personality of competing brands in the market.

• 한국광학회지
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• 제4권4호
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• pp.464-473
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• 1993

본 논문에서는 광섬유에 아르곤 레이저 빔이 입사될 때 생기는 위상격자 형성에 관한 역학을 다룬다. 간단한 쌍광자 표백모델(two-photon bleaching model)을 이용하여 위상격자가 시간이 지남에 따라 이상적인(ideal) 격자로 자기조직됨(self-organized)을 보인다. 광섬유의 각점에서의 시간에 따른 상태전개는 하나의 보편 매개변수(universial parameter)에 의해 나타내어지고 또한 이 광섬유계를 기술하는 연립편미분 방정식이 이 매개변수에 의해 연립 상 미분 방정식으로 간소화 된다. 이 연립 상 미분 방정식을 이용하여 위상격자가 자라나는 상태는 한 고정점(a fixed point)를 향해 가는 과정이고 이 고정점은 완벽히 위상맞춤(phase-matched)된 격자에 해당된다는 것을 보인다.

• Journal of applied mathematics & informatics
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• 제34권1_2호
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• pp.115-143
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• 2016

The concept of quasi-coincidence of interval valued intuitionistic fuzzy point with an interval valued intuitionistic fuzzy set is considered. By using this idea, the notion of interval valued (α, β)-intuitionistic fuzzy bi-ideals, (1,2)ideals in a semigroup introduced and consequently, a generalization of interval valued intuitionistic fuzzy bi-ideals and intuitionistic fuzzy bi-ideals is defined. In this paper, we study the related properties of the interval valued (α, β)-intuitionistic fuzzy bi-ideals, (1,2) ideals and in particular, an interval valued (Є, Є ∨q)-fuzzy bi-ideals and (1,2) ideals in semigroups will be investigated.