• 전자공학회논문지B
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• 제28B권10호
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• pp.807-821
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• 1991

A mulitpath MIN(Multistage Interconnection Network), CSMP(Chained Shuffle Multi-Path) network, is proposed, having fault-tolerance and dynamic reroutability. The number of stages and the number of links between adjacent stagges are the same as in single path MINs, so the overall hardware complexity is considerably reduced in comparison with other multipath MINs. The CSMP networks feature links between switches belonging to the same state, forming loops of switches. The network can tolerate multiple faults, up to (N/4)*(log$_2$N-1), having occured in any stages including the first and the last ones(N:NO. of input). To analyze reliability, terminal reliability (TR) and mean time to failure( MTTE) age given for the networks, and the TR figures are compared to those of other static and dynamic rerouting multipath MINs. Also the MTTE figures are compared. The performance of the proposed network with respect to its bandwidth (BW) and probability of acceptance(PA) is analyzed and is compared to that of other more complex multipath MINs. The cost efficiency analysis of reliability and performance shows that the network is more cost-effective than other previously proposed fault-tolerant multipath MINs.

• Nuclear Engineering and Technology
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• 제52권1호
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• pp.185-191
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• 2020

Plant-specific analyses of an advanced reactor have been performed to assure the structural integrity of the reactor pressure vessel during transient conditions, which are expected to initiate pressurized thermal shock (PTS) events. The vessel failure probabilities from the probabilistic fracture mechanics analyses are combined with the transient frequencies to generate the through-wall cracking frequencies, which are compared to the acceptance criterion. Several sensitivity analyses are performed, focusing on the orientations and sizes of cracks, the copper content, and a flaw distribution model. The results show that the integrity of the reactor vessel is expected to be maintained for long-term operation beyond the design lifetime from the PTS perspective using the design data of the advanced reactor. Moreover, a fluence level exceeding 9×10¹⁹ n/㎠ is found to be acceptable, generating a sufficient margin beyond the design lifetime.

• Nuclear Engineering and Technology
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• 제52권5호
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• pp.975-983
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• 2020

Since the Fukushima Daiichi accident in 2011, concerns for the safety of multi-unit Nuclear Power Plant (NPP) sites have risen. This is because more than 70% of NPP sites are multi-unit sites that have two or more NPP units and a multi-unit accident occurred for the first time. After this accident, Probability Safety Assessment (PSA) has been considered in many countries as one of the tools to quantitatively assess the safety for multi-unit NPP sites. One of the biggest concerns for a multi-unit accident such as Fukushima is that the consequences (health and economic) will be significantly higher than in the case of a single-unit accident. However, many studies on multi-unit PSA have focused on Level 1 & 2 PSA, and there are many challenges in terms of public acceptance due to various speculations without an engineering background. In this study, two kinds of multi-unit Level 3 PSA for multi-unit site have been carried out. The first case was the estimation of multi-unit risk with conservative assumptions to investigate the margin between multi-unit risk and QHO, and the other was to identify the effect of time delays in releases between NPP units on the same site. Through these two kinds of assessments, we aimed at investigating the level of multi-unit risk and understanding the characteristics of risk in a multiunit context.

• The Journal of Asian Finance, Economics and Business
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• 제8권5호
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• pp.689-695
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• 2021

In the current technology-driven era, Small and medium enterprises (SMEs) have been deemed as one of the leading and prominent drivers of sustainable economic progress in emerging and developing economies such as in the Bangladesh context. Hence, it is of significance to understand what might fuel accelerating performance of SME business as increased SME performance will bring about more sustainability and strong development of SME sector within the country, through which more employment is anticipated to be generated. Therefore, the current study examines the impact of three factors: risk-taking, innovativeness, and proactiveness on SME performance in Bangladesh. The study has gathered data from SME entities in Dhaka city of Bangladesh, by applying a non-probability sampling strategy. 250 SME owners were contacted to act as respondents and finally, 180 SME owners fully completed the survey questionnaire, indicating that the final sample size is n=180. SPSS is used as a purpose of testing the hypotheses by considering a 5% significance level as acceptance criteria of the hypothesis. Hierarchical regression analysis was run to understand the impact of control variables and independent variables on SME performance and found that age of business, risk-taking, innovativeness, and proactiveness have an important impact on SME performance in Bangladesh.

• Journal of Forest and Environmental Science
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• 제36권4호
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• pp.311-317
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• 2020

Mushroom has economic, food and medicinal value to a large proportion of human populace. This study assessed the consumption pattern of mushroom species in Southwestern Nigeria. Non-probability sampling method was used to select 20 Local Government Areas (LGAs) from 3 states and four communities were selected purposively from each LGAs. Snow-ball sampling approach was used in selecting 5 respondents from each community, making a total of 400 respondents. Descriptive statistics was used to describe the socio-economic characteristics of the respondents, to compare the differences between the local (wild) and Exotic (cultivated) mushroom Species and to determine the rate at which mushroom substitute is consumed among the mushroom consumers. Logit regression was used to identify the factors influencing mushroom consumption in the study area. Thirty percent of the respondents were aged 41 to 50 years, with mean age of 49.76 years. About 82% had tertiary education, 17.3% earned above N200,000 monthly and 8.8% spent above N6000 monthly on mushroom. Logit regression showed that age (-3.21), household size (-2.17) and medicinal benefits (-2.17) had significant (p<0.01) negative effects on mushroom consumption. Conclusively, mushroom has wide acceptance among the general populace, good for food and medicine; hence, awareness should be created through agricultural policy on the need for mushroom cultivation and consumption in Nigeria.

• 대한간호학회지
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• 제53권4호
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• pp.480-495
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• 2023

Purpose: This study aimed to develop and test a structural equation model on social re-adjustment of individuals with stroke based on a literature review and Roy's adaptation model. Methods: This study involved 321 participants who had a stroke and visited the outpatient department after discharge. The hypothetical model was developed based on Roy's adaptation model and a comprehensive review of previous literature on the topic. The model comprised four exogenous variables (neurological damage, gender [man], age, and social support) and five endogenous variables (activities of daily living, acceptance of disability, depression, rehabilitation motivation, and social re-adjustment). The data were analyzed using SPSS Windows software version 22.0 and AMOS 23.0. Results: Out of 28 research hypotheses, 18 were supported, and they indicated approximately 64% probability of social re-adjustment. Social re-adjustment is directly and significantly affected by age, social support, activities of daily living, and depression. Social re-adjustment is indirectly affected by neurological impairment, gender (men), age, social support, and rehabilitation motivation. Conclusion: Continuous assistance and care should be provided for individuals with disabilities caused by sudden neurological damage to facilitate gradual improvement in their social re-adjustment. To enhance social re-adjustment, especially among older adults, newly developed interventions should focus on improving their activities of daily living, preventing depression, and enhancing support from family and healthcare personnel.

• 산경연구논집
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• 제15권3호
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• pp.21-29
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• 2024

Purpose: Electronic vehicles (EV) consumption become more prevalent among Vietnamese consumers. This paper aims to empirically assess the determinants of EV purchase intention among Vietnamese consumers. The research findings are expected to promote the consumption of electric vehicles in Vietnam. Research design, data and methodology: The quantitative research approach employed the Exploratory Factor Analysis (EFA). The sample size includes 301 respodents. Research design unified Theory of Acceptance and Use of Technology (UTAUT) and UTAUT2. The data collection process employ the non-probability sampling. Questionaire survey consists of 24 questions given to respondents via Google Form link. Data is processed by SPSS version 20 software. Results: The results proposed 04 determinants of the intention to buy electric vehicles: Government Support, Environmental Concern, Price Value, and Performance. Conclusions: Theorectical implications and managerial implications are also discussed to promote the consumption of electronic vehicles in Vietnam. Besides, the findings show that Price value, Environmental Concern and Performance positively affect the purchase intention of EV among Vietnamese consumers. Remarkably, Government Support is proven to be an insignificant factor in EV purchase intention. The call for further research rely on the role of government support in order to promote EV consumption in Vietnam and other emerging markets worldwide.

• 한국식품영양과학회지
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• 제35권5호
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• pp.641-648
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• 2006

본 연구는 함초가루를 이용한 설기떡을 개발하기 위하여 재료의 최적 혼합비율을 찾는데 목적이 있다. 설기떡의 품질에 가장 영향을 미치는 수분, 함초가루, 설탕첨가율을 독립 변수로 설정하였고, 예비실험을 거쳐 수분 $13{\sim}18%$, 함초가루 $2{\sim}6%$, 설탕 $8{\sim}13%$의 범위에서 혼합물 실험계획법(mixture design) 중 D-optimal design을 이용하여 최적 재료 혼합비율을 찾고자 하였다. 각 설정된 범위를 입력하였을 때 10개의 실험점이 형성되었고, 4개의 반복점이 선택되어 실험점은 모두 14개가 설정되었다. 각 조건별 실험결과를 모델링화 하여 F-test를 통해 유의성을 검증한 결과 색도의 명도, 적색도, 황색도, 텍스쳐의 검성과 씹힘성, 관능검사 항목인 맛과 부드러운 정도는 linear 모델로 결정되었고, 텍스쳐의 경도, 관능검사의 색, 냄새, 촉촉한 정도, 전반적인 기호도는 quadratic 모델로 결정되었다. 모델의 적합성을 분석한 결과 모든 항목에서 probability가 모두 0.05% 이내에서 유의성을 보여 모델로서 적합함이 인정되었다. 반응표면과 trace plot의 결과 수분과 설탕첨가율이 높을수록, 함초가루 첨가량율이 낮을수록 명도는 높고, 적색도와 황색도는 낮았다. 텍스쳐의 경우 함초 첨가율이 증가할수록 경도, 검성, 씹힘성이 증가하여 함초가루의 첨가율이 높을 경우 설기떡의 부드러움을 저하하는 원인이 되었다. 관능검사 결과에서도 수분, 함초가루, 설탕을 많이 첨가할 경우에는 오히려 낮은 점수를 받았고, 특히 수분과 함초가루에 의하여 많은 영향을 받았다. 함초가루를 첨가한 설기떡의 최적 재료 혼합비율은 수치 최적화에서는 수분 15.2%, 함초가루 3.0%, 설탕 9.8%이었고, 모형적 최적화에서는 desirability가 0.620에 해당하는 수분 15.2%, 함초가루 3.1%, 설탕 9.7%로 수치 최적화점과 유사하게 나타났다.

• 인터넷정보학회논문지
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• 제6권6호
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• pp.99-106
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• 2005

멀티프로세서 시스템에서 스케줄링은 매우 중요한 부분이지만, 최적의 해를 구하는 것이 복잡하여 다양한 휴리스틱 방법들에 의한 스케줄링 알고리즘들이 제안되고 있다. 최근 유전 알고리즘을 사용한 멀티프로세서 스케줄링 알고리즘들이 제시되고 있지만, 제시된 알고리즘 대부분은 한가지만의 목적을 가지는 단순한 알고리즘이다. 본 논문에서는 유전 알고리즘을 이용한 새로운 스케줄링 알고리즘을 제시한다. 또한, 해를 구하는 과정에서 시뮬레이티드 어닐링 (simulated annealing)의 확률을 이용하여 유전 알고리즘의 성능을 개선시킨다. 제시된 알고리즘은 태스크들의 최종 수행 완료 시간 (makespan)을 최소화하는 것과 사용된 프로세서의 수를 최소화하는 두 가지의 목표를 가진다. 모의 실험을 통하여 제시된 알고리즘이 다른 알고리즘보다 최종 수행 완료 시간과 사용된 프로세서의 수에서 더 나은 결과를 보임을 확인할 수 있었다.

• 방송공학회논문지
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• 제18권4호
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• pp.515-524
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• 2013

본 논문에서는 모바일 환경에서의 얼굴인증을 위해 개인별 주요 블록에 대한 LBP 매칭 기반의 새로운 방법을 제안한다. 주어진 사진으로부터 개인별 주요 블록을 구성하기 위하여 유사도가 높은 블록을 찾아 블록별 확률 분포를 계산하고 임계값을 적용하여 사람마다 다른 블록의 개수를 얼굴인증에 사용하도록 한다. 그리고 단일 반경 LBP 기반 얼굴인증 방법의 성능 향상을 위하여 다중 반경 LBP 히스토그램을 이용하여 개인별 주요 블록을 결정한다. 실험 결과 다중 반경 LBP 히스토그램을 이용함으로써 단일 반경 LBP 히스토그램만 사용하여 얼굴인증을 수행할 때보다 타인의 인증을 수락하는 오인수락율을 줄일 수 있었다. 또한, 기존 방법과의 성능 비교에서 제안한 방법이 블록의 개수는 기존 방법의 44.59%만 사용하면서 인증 오류율은 평균 7.72% 낮은 결과를 얻었다.