• 한국정보통신학회논문지
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• 제11권4호
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• pp.800-807
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• 2007

웹서비스는 서로 다른 플랫폼간의 통합을 가능하게 하였으나, 네트워크 환경이나 임베디드 시스템과 같이 상대적으로 느린 통신 매체에 자주 접속하거나 모바일과 같이 자원이 한정적인 소형 기기에서 사용 할 경우 전체 응용프로그램의 성능을 저하시키는 문제가 발생하고 있다. 이에 ITU-T(International Telecommunication Union - Telecommunication)와 ISO(International Organization for Standardization)/ IEC(International Electrotechnical Commission) 에서 공동으로 바이너리 XML 인코딩 표준을 제안하게 되었으며, 현재 진행 중인 바이너리 XML 인코딩 표준으로는 Fast Infoset과 Fast Schema가 있다. 본 논문에서는 웹서비스의 성능 향상을 위해 현재 표준화가 진행 중인 Fast Infoset 알고리즘과 Fast Schema 알고리즘을 도입하여 Fast XML 인코딩 시스템을 구현하였다. 또한, 구현된 Fast XML 인코더를 통하여 개발자나 사용자들이 Fast 웹서비스 시스템을 구축하는데 있어 참고 할 수 있는 테스트 베드를 제공한다.

• 한국안전학회지
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• 제18권1호
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• pp.38-43
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• 2003

In this paper, the low cycle fatigue(LCF) life tests were carried out under waveforms of asymmetric triangle($4{\times}10^{-3}$ and $4{\times}10^{-10}$ strain rate) and hold-time(1min and 10min) in strain control. In triangular waveform, the fatigue lives of fast-slow waveforms were decreased to about 63-73% and them of slow-fast waveforms were down to about 23-24% compared to them of fast-fast waveforms. The shapes of fracture surfaces were transgranular in fast-fast and fast-slow waveforms and intergranular in slow-fast ones. The fatigue lives of slow-fast waveforms were remarkedly shorter than them of hold-time waveforms even though cycle times of hold time waveforms were longer than them of slow-fast ones. The damage mechanisms of frature surfaces were mixed frature with both transgranular and intergranular, but intergranular fratures were r-type cavity in hold-time waveforms and w-type cavity in slow-fast ones.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.865-868
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• 2007

웹서비스는 운영환경에 독립적인 XML(Extensible Markup Language)을 사용하여 서로 다른 플랫폼간의 통합을 가능하게 하고 있다. 그러나 XML은 불필요한 텍스트 데이터를 많이 가지고 있기 때문에 무선 인터넷이나 이동통신모뎀과 같이 상대적으로 느린 통신 매체에 자주 접속하거나 자원이 한정적인 소형 기기에서 사용할 경우 전제적인 성능을 저하시키는 문제점이 있다. 이에 XML을 바이너리화 하여 문서의 크기를 줄이는 표준을 ITU-T(International Telecommunication Union - Telecommunication)와 ISO(International Organization for Standardization)/ IEC(International Electrotechnical Commission) 에서 공동으로 제안하게 되었으며, 현재 진행 중인 바이너리 XML 인코딩 표준으로는 Fast Infoset과 Fast Schema가 있다. 이에 본 논문에서는 웹서비스의 성능 향상을 위해 현재 표준화가 진행 중인 Fast Infoset 알고리즘과 Fast Schema 알고리즘을 도입하여 Fast XML 인코딩 시스템을 구현하였다.

• 한국의류산업학회지
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• 제17권4호
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• pp.550-560
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• 2015

This study investigates clothing consumption behavior of fast fashion purchasers according to environmental consciousness. Questionnaire examined 245 males and females in Busan who experienced fast fashion product purchases. Data were analyzed using factor analysis, t-test. ANOVA, Duncan Test and ${\chi}^{2}-test$. The results are as follows. First, the result showed significant differences in environmental consciousness education according to demographic characteristics. Second, the results showed significant differences in the hedonic pursuit of purchase motivation for fast fashion products according to environmental consciousness. The low environmental awareness group pursued hedonic purchases towards the purchase motivation of fast fashion products. The results showed significant differences in fast fashion disposal behavior according to environmental consciousness; however, not for the disposal motivation of fast fashion. In the disposal behavior of fast fashion, the high environmental awareness group indicated social friendly disposal and the middle environmental awareness group indicated economical disposal. The result showed significant gender differences towards clothing consumption behavior of fast fashion according to demographic characteristics. Males and females showed significant differences in all purchase motivation factor for fast fashion products. They also showed significant differences in economical disposal towards fast fashion disposal behavior.

• Nuclear Engineering and Technology
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• 제52권6호
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• pp.1110-1119
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• 2020

The Floating Absorber for Safety at Transient (FAST) is a safety device used in the innovative Sodium-cooled Fast Reactor (iSFR). The FAST insert negative reactivity under transient or accident conditions. However, behavior of the FAST is still unclear under transient conditions. Therefore, the existing Floating Absorber for Safety at Transient Analysis Code (FASTAC) is improved to analyze the FAST movement by considering the reactivity and temperature distribution within the reactor core. The current FAST system is simulated under a single control rod withdrawal accident condition. In this investigation, the reactor thermal power does not return to its initial thermal power even if the FAST inserts negative reactivity. Only a 9 K of coolant temperature margin, in the hottest fuel assembly at EOL, can lead to unnecessary insertion of the negative reactivity. On the other hand, the FASTs cannot contribute to controlling the reactivity when normalized radial power is less than 0.889 at BOL and 0.972 at EOL. These simulation results suggest that the current FAST design needs to be optimized depending on its installed location. Meanwhile, the FAST system keeps the fuel, cladding and coolant temperatures below their limit temperatures with given conditions.

• 패션비즈니스
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• 제14권5호
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• pp.21-34
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• 2010

The purpose of this study is to examine the main characteristics of strategies and fashion styles in fast fashion. Ultimately, this study is aimed to give useful information to develop fast fashion companies in Korean apparel industry. There are several strategies commonly applied in most fast fashion companies. First, they produce a wide range of numerous items. Second, the price is very reasonable. The primary objective of fast fashion is to quickly produce products in a cost efficient manner. Third, fast fashion companies take charge in the whole process from designing and manufacturing to distribution and sales. Forth, while almost all apparel companies invest a large amount in advertisement to promote sales, most fast fashion companies invest in VMD instead. Also, the fashion style of fast fashion were examined. First, casual style dominated a big part in composition of the entire style. Second, they use various kinds of different fabrics. For example, natural fabrics including organic and recycled fabrics, denims, newly invented high-tech fabrics, and decorative fabrics are widely used. Third, fast fashion brands produce fashion product based on the most recent fashion trends. Forth, they pursue high quality design. Retailers' understanding of the target market's wants realizes the consumer to thrive on constant change and the frequent availability of new products. Accordingly, fast fashion is presently taking an important role in fashion although it has a short history compared to the general apparel industry.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권2호
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• pp.658-675
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• 2022

This paper presents a fast-simplified successive cancellation (SC) flipping (Fast-SSC-Flip) decoding algorithm for polar code. Firstly, by researching the probability distribution of the number of error bits in a node caused by channel noise in simplified-SC (SSC) decoder, a measurement criterion of node reliability is proposed. Under the guidance of the criterion, the most unreliable nodes are firstly located, then the unreliable bits are selected for flipping, so as to realize Fast-SSC-Flip decoding algorithm based on node reliability (NR-Fast-SSC-Flip). Secondly, we extended the proposed NR-Fast-SSC-Flip to multiple node (NR-Fast-SSC-Flip-ω) by considering dynamic update to measure node reliability, where ω is the order of flip-nodes set. The extended algorithm can correct the error bits in multiple nodes, and get good performance at medium and high signal-to-noise (SNR) region. Simulation results show that the proposed NR-Fast-SSC-Flip decoder can obtain 0.27dB and 0.17dB gains, respectively, compared with the traditional Fast-SSC-Flip [14] and the newly proposed two-bit-flipping Fast-SSC (Fast-SSC-2Flip-E2) [18] under the same conditions. Compared with the newly proposed partitioned Fast-SSC-Flip (PA-Fast-SSC-Flip) (s=4) [18], the proposed NR-Fast-SSC-Flip-ω (ω=2) decoder can obtain about 0.21dB gain, and the FER performance exceeds the cyclic-redundancy-check (CRC) aided SC-list (CRC-SCL) decoder (L=4).

• 한국안전학회지
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• 제14권1호
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• pp.41-48
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• 1999

The fatigue life tests were performed in strain control with triangular and hole-time wave-forms at $650^{\circ}C$. The fatigue lifes were investigated according to waveform examining damage mechanisms, which could be used to predict the fatigue life and estimate the remaining life. The results obtained are as follows; The fatigue lifes were in order of the fast-fast>the fast-slow>the slow-fast in the triangular waveforms, and the fatigue lifes in slow-fast waveforms got shorter in the hold-time waveforms. The damage mechanisms of the fracture surfaces were transgranular fracture in the fast-fast, the fast-slow waveforms and intergranular fracture in the slow-fast waveform.

• Nuclear Engineering and Technology
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• 제39권3호
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• pp.187-192
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• 2007

The basic research on fast reactor technology was started in the mid-1960's in China. The emphasis was put on fast reactor neutronics, thermohydraulics, sodium technology, materials, fuels, safety, sodium devices and instrumentation. In 1987, the research turned to applied basic research with the conceptual design of a 60 MW experimental fast reactor as a target. The Project of the China Experimental Fast Reactor(CEFR) with a thermal power 65 MW was launched in 1993. The R&D of fast reactor technology then carried out to serve a design demonstration connected with the different phases of the conceptual, preliminary and detailed design of the CEFR. Recently, three directions of fast rector technology R&D activities have been considered, and some research programs have been developed. They are: (1) R&D related to the CEFR, i.e. experiments to be conducted on the CEFR for its safe operation, (2) R&D related to the projects of a prototype and the demonstration of fast reactors, and(3) advanced SFR technology within the framework of the international cooperation of INPRO and GIF.

• Nuclear Engineering and Technology
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• 제53권6호
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• pp.1747-1755
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• 2021

This paper presents floating absorber for safety at transient (FAST) which is a passive safety device for sodium-cooled fast reactors with a positive coolant temperature coefficient. Working principle of the FAST makes it possible to insert negative reactivity passively in case of temperature rise or voiding of coolant. Behaviors of the FAST in conventional oxide fuel-loaded and metallic fuel-loaded SFRs are investigated assuming anticipated transients without scram (ATWS) scenarios. Unprotected loss of flow (ULOF), unprotected loss of heat sink (ULOHS), unprotected transient overpower (UTOP) and unprotected chilled inlet temperature (UCIT) scenarios are simulated at end of life (EOL) conditions of the oxide and the metallic SFR cores, and performance of the FAST to improve the reactor safety is analyzed in terms of reactivity feedback components, reactor power and maximum temperatures of fuel and coolant. It is shown that FAST is able to improve the safety margin of conventional burner-type SFRs during ULOF, ULOHS, UTOP and UCIT.