• International Journal of Reliability and Applications
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• 제11권2호
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• pp.139-151
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• 2010

The main objective of this study is to present a new approach to obtain moment inequalities for the new better than renewal used (NBRU) class of life distributions. In order to achieve our main objective, the moment inequalities for NBRU class of life distribution using the new approach has been derived and then a new test for testing exponentiality against NBRU class based on these inequalities has been constructed. Then we calculate the Pitman asymptotic efficiency for the proposed test using some alternative distributions and comparing it with the other tests. Moreover, we make a comparison between Pittman asymptotic efficiencies (PAE's) and PAE's of some other tests. A simulation study is conducted to calculate the upper critical values and the power estimate of the proposed test for some common alternatives. Finally, we apply the suggested test to some real data.

• International Journal of Reliability and Applications
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• 제15권1호
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• pp.1-9
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• 2014

Let X and $X_t$ denote the lifetime and the residual life at age t, respectively. X is said to be a NBUL (new better than used in Laplace transform order) random variable if $X_t$ is smaller than X in Laplace order, i.e., $X_t{\leq}_{LT}X$. We propose a new test statistics for testing exponentiality versus NBUL class of life distribution. The tests by Hollender and Proschan (1975) and the generalized Hollender and Proschan test by Ains and Mitra (2011) are considered as special cases of the our of test statistics. Our proposed test statistics is simple, consistent and asymptotically normal. Efficiency and powers of the test statistics for some commonly used distributions in reliability are discussed. Finally, real examples are presented to illustrate the theoretical results.

• 한국해양공학회지
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• 제26권2호
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• pp.26-32
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• 2012

In this paper, the effects of irregular bead shapes on fatigue life were investigated. A modified S-N curve method was used to estimate the fatigue life, which considered the inherent multiaxiality caused by the geometrical feature produced by the welding process. The point method of the critical distance method was used to determine the fatigue effective stress. Three types of fillet joint models were tested in the fatigue experiments. For each model, real bead shapes were collected using a 3D laser scanner, and finite element analyses were performed. The results of the analyses with actual bead shapes were compared with those using an idealized bead shape model. The results of the present analytical methods showed good agreement with the experimental results.

• Geomechanics and Engineering
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• 제18권4호
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• pp.373-389
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• 2019

It is important to study the problem of durability for tunnel structures. As a main influence on the durability of tunnel structures, carbonation-induced corrosion is studied. For the complicated environment of tunnel structures, based on the data samples from real engineering examples, the intelligent method (genetic programming) is used to construct the service life prediction model of tunnel structures. Based on the model, the prediction of service life for tunnel structures in carbonation environments is studied. Using the data samples from some tunnel engineering examples in China under carbonation environment, the proposed method is verified. In addition, the performance of the proposed prediction model is compared with that of the artificial neural network method. Finally, the effect of two main controlling parameters, the population size and sample size, on the performance of the prediction model by genetic programming is analyzed in detail.

• Asian-Australasian Journal of Animal Sciences
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• 제26권11호
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• pp.1644-1650
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• 2013

Ribosomal protein (rp) S6 is the substrate of ribosomal protein S6K (S6 kinase) and is involved in protein synthesis by mTOR/S6K/S6 signaling pathway. Some S6 cDNA have been cloned in mammals in recent years but has not been identified in the goat. To facilitate such studies, we cloned the cDNA encoding Cashmere goat (Capra hircus) S6 (GenBank accession GU131122) and then detected mRNA expression in seven tissues by real time PCR and protein expression in testis tissue by immunohistochemisty. Sequence analysis indicated that the obtained goat S6 was a 808 bp product, including a 3' untranslated region of 58 bp and an open reading frame of 750 bp which predicted a protein of 249 amino acids. The predicted amino acid sequence was highly homologous to cattle, human, mouse and rat S6. Expression analysis indicated S6 mRNA was expressed extensively in detected tissues and S6 protein was expressed in testis tissue.

• Journal of Information Processing Systems
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• 제5권2호
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• pp.77-86
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• 2009

In this paper, we propose a framework for the real-time monitoring of wireless biosensors. This is a scalable platform that requires minimum human interaction during set-up and monitoring. Its main components include a biosensor, a smart gateway to automatically set up the body area network, a mechanism for delivering data to an Internet monitoring server, and automatic data collection, profiling and feature extraction from bio-potentials. Such a system could increase the quality of life and significantly lower healthcare costs for everyone in general, and for the elderly and those with disabilities in particular.

• Journal of Microbiology and Biotechnology
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• 제22권4호
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• pp.479-483
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• 2012

The secretory efficiency of recombinant xylanase xynB from yeast Pichia pastoris between the ${\alpha}$-factor preprosequence and a classical mammalian signal peptide derived from bovine ${\beta}$-casein was compared. The results showed that although the bovine ${\beta}$-casein signal peptide could direct high-level secretion of recombinant xylanase, it was relatively less efficient than the ${\alpha}$-factor preprosequence. In contrast, the bovine ${\beta}$-casein signal peptide caused remarkably more recombinant xylanase trapped intracellularly. Real-time RT-PCR analysis indicated that the difference in the secretory level between the two signal sequences was not due to the difference in the transcriptional efficiency.

• 한국가정과교육학회지
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• 제16권4호
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• pp.95-105
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• 2004

본 연구의 목적은 청소년들이 건전하고 합리적인 소비생활을 영위할 수 있도록 실생활에 활용할 수 있는 실질적이고 효율적인 학교 소비자 교육 프로그램을 개발하는데 있다. 청소년을 대상으로 개발한 "나 가정, 사회 그리고 소비생활" 프로그램은 가정인. 생활인으로서의 개인이 소비생활과 관련된 일상생활에서 부딪히는 실천적 문제를 해결하는데 주안점을 두었다. 본 프로그램의 내용은 "나와 소비생활", "나와 가정의 소비생활", "나와 사회의 소비생활"로 구성되었으며. 이를 통하여 청소년들은 소비생활에서 부딪히는 실천적 문제를 해결할 수 있는 실천적 추론 능력을 향상시킬 수 있고, 올바른 소비 가치관을 형성하여 미래의 현명한 소비자로서의 역할을 수행할 수 있을 것이다.

• 유통과학연구
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• 제4권2호
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• pp.123-144
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• 2006

국민의 재산권 보호를 위하여 부동산거래의 불확실성 해소와 신뢰성 확보는 매우 중요하다. 생활양식의 변화에 따라 부동산시장은 다양화되고 부동산거래의 수준도 다양화되는데 비하여 부동산거래제도는 아직도 과거의 틀을 벗지 못하고 있다. 이에 능동적으로 대처해 나가기 위해서는 부동산 거래방식에 대한 재검토가 필요하며, 특히 현재의 중개계약방식을 선진화할 수 있는 방안을 검토할 필요가 있다. 전속중개계약과 부동산거래정보망제도는 이미 미국, 일본 등의 여러 선진국가에서 보편화된 제도이며 부동산중개업의 거래질서를 확립하고 부동산중개의뢰인의 재산권 보호 및 편익제공을 위해 권장 실시되고 있는 제도이다. 우리나라에서는 1993년 12월에 개정된 부동산중개업법에서 전속중개계약과 부동산거래정보망제도가 신설되었다. 그러나 여러 가지 문제로 말미암아 10여년이 지난 현재까지도 제대로 제도 정착이 안 되고 있는 실정이다. 이에 본 연구에서는 전속중개계약 및 부동산거래정보망제도 활성화에 대한 특성요인을 개발하여 요인별 상관관계를 살펴보고, 이러한 요인이 중개기능의 제고와 부동산중개업자의 신뢰성, 고객만족에 미치는 영향을 실증분석을 통하여 고찰하였다. 이를 바탕으로 현재 존재가치가 유명무실한 우리나라의 전속중개계약 및 부동산거래정보망제도에 대한 활성화방안과 정책적 시사점을 제시하였다.

• 한국재난정보학회 논문집
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• 제20권2호
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• pp.448-461
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• 2024

연구목적: 본 연구는 포스트 코로나 시대에 생활 SOC 시설을 설치하고, 운영하기 위해 우리나라 특성에 적합한 생활권 위계를 설정하고, 유형을 구분하는 것을 목적으로 한다. 연구방법: 생활권과 관련된 정책과 선행연구들을 통해 생활권의 개념을 정립하였고, 생활권 위계에 따라 생활권의 유형을 인구, 고용, 교통, 경제, 교육 등 다양한 분야의 데이터를 z-score 기법을 이용하여 유형구분을 하였다. 연구결과: 우리나라 생활권은 규모에 따라 광역생활권, 권역생활권, 도시생활권, 마을생활권, 동네생활권으로 구분할 수 있으며, 역할에 따라 중심생활권, 직주균형생활권, 주거생활권, 산업생활권, 저밀생활권으로 유형구분을 할 수 있다. 결론: 본 연구의 결과는 타당한 생활권 설정과 적절한 생활 SOC공급은 낙후지역의 쇠퇴를 막고, 지역 간 균형발전에 기여할 수 있다