• Nuclear Engineering and Technology
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• 제44권2호
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• pp.177-198
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• 2012

This paper reviews the fast reactor physics and computational methods. The basic reactor physics specific to fast spectrum reactors are briefly reviewed, focused on fissile material breeding and actinide burning. Design implications and reactivity feedback characteristics are compared between breeder and burner reactors. Some discussions are given to the distinct nuclear characteristics of fast reactors that make the assumptions employed in traditional LWR analysis methods not applicable. Reactor physics analysis codes used for the modeling of fast reactor designs in the U.S. are reviewed. This review covers cross-section generation capabilities, whole-core deterministic (diffusion and transport) and Monte Carlo calculation tools, depletion and fuel cycle analysis codes, perturbation theory codes for reactivity coefficient calculation and cross section sensitivity analysis, and uncertainty analysis codes.

• International Journal of Costume and Fashion
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• 제6권2호
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• pp.1-10
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• 2006

The purpose of this study was to identify the differences in shopping orientation and clothing benefit sought of a group of consumers according to the preference for fast-fashion. Data were collected from a questionnaire conducted on 416 female adults. The results were as follows. First. the factor analysis used to identify shopping orientation involved the following five factors: hedonic. economic. convenient. brand-oriented. and relation-oriented. The dimensions of the clothing benefit sought consisted of fashion. social status. practicality. figure flaw compensation. and sex appeal. Second. the differences in shopping orientation and clothing benefit sought according to the preference for fast-fashion were identified using a t-test. The consumer group preferring fast-fashion exhibited a hedonic. convenient shopping orientation. and the non-preferring group exhibited an economic. brand-oriented shopping orientation. The consumer group preferring fast-fashion pursued fashion and sex appeal clothing benefits. and the non-preferring group pursued social status and practicality clothing benefits.

• 대한전기학회논문지:시스템및제어부문D
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• 제50권6호
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• pp.272-282
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• 2001

This paper developed improved fast Walsh transform based on dyadic-ordered fast Walsh transform, then regenerated signal flow graph of improved fast Walsh transform, and used it for digital filtering, and then measured fundamental frequency and harmonics for current and voltage signals of power system. Using the improved fast Walsh transform, we present a new algorithm which reduces the computational amount, and it can consequently calculate the real and imaginary components for current and voltage signals of power system in sampling intervals. The calculation amount is reduced to 2(N-1) at N samples to measure full harmonics using developed algorithm. When, in single harmonic measuring, it needs only 2(log2N-1) additions and subtractions.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2011년도 춘계학술대회
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• pp.185-204
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• 2011

Fast Fashion (fast fashion) is to reflect the latest trends and quickly create an immediate and quick with words related to clothing to distribute immediately reflect the latest fashion design, a relatively low cost, rapid product turnover means to succeed in fashion or business. The popularity of fast fashion is growing in the recent domestic fashion market. In this study, fast-fashion consumers' purchasing behavior recognition for brand identification and brand personality, brand reputation and brand identification, brand attitude, and affect the relationship between customer loyalty will be discussed. The results of this study can be summarized as follows. First, In this study, based on existing studies, brand personality and brand identification through a process that affects customer loyalty reaffirmed. Second, the 5 dimensions of brand personality and brand identification of the factors found by the sophistication and unique. Third, the brand's reputation in the brand identification had a significant impact. Fourth, brand identification, brand attitude and the impact on customer loyalty was significant.

• 한국생활과학회지
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• 제16권5호
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• pp.997-1006
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• 2007

The consideration of the effective corresponding system is required to enhance expectation of consumers and satisfy consumer needs in response to recent fashion market trend showing polarized phenomena. One of the solutions is to establish Korean style SPA brand which not only utilizes traditional fashion markets and but also adopt a production system of the fast fashion. A traditional market can provide some advantages such as low price, a variety of items in an integrated buildings, fast propagation of fashion trends and a flexible production system reflecting consumer's need immediately. The production system of fast fashion has integrated system of planning, manufacturing and distributing to provide trendy products with low price on time. Therefore, The Korean style SPA offers trendy, cheap and chic clothing to customers as quickly as possible.

• Journal of electromagnetic engineering and science
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• 제1권1호
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• pp.18-23
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• 2001

A fast-sweep broadband FM reflectometer system has been successfully developed and operacted at the DIII-D tokamak, producing reliable density Profiles with excellent spatial (1 $\leq$ cm) and temporal resolution (~100 $\mu$ s). The system uses a solid-state microwave oscillator and an active quadrupler, covering full Q-band frequencies (33~50 GHz) and providing relatively high output power (20~60 mW). The system hardware allows fu11band frequency sweep in 10 $\mu$ s, but due to digitization rate limit on DIII-D, sweep time was limited to 75~100 $\mu$ s. Fast frequency sweep has helped to reduce density fluctuation effects on the reflectometer phase measurements, thus improving reliability for individual sweeps. The fast-sweep system with high spatial and temporal resolution has allowed to measure fast-changing edge density profiles during plasma ELMS and L-H transitions, thus enabling fast-time sca1e physics studies.

• Journal of electromagnetic engineering and science
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• 제14권4호
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• pp.336-341
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• 2014

Dosimetry of radiating electromagnetic wave from mobile devices to human body has been evaluated by measuring Specific Absorption Rate (SAR). Usual SAR measurement system scans the volume by robot arm to evaluate RF power absorption to human body from wireless devices. It is possible to fast estimate the volume SAR by software deleting robot moving time with the 2D surface SAR data acquired by arrayed probes. This paper shows the principle of fast SAR measurement and the measured data comparison between the fast SAR system and the robot scanning system. Data of the fast SAR is well corresponding with data of robot scanning SAR within ${\pm}3$ dB, and its dynamic range covers from 10 mW/kg to 30 W/kg with 4.8 mm probe diameter.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2620-2623
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• 2000

The standard approach consists of using correlation of orthogonal functions in digital filtering, such as well-known FFT(Fast Fourier Transform) and FWT(Fast Walsh Transform). But it needs much calculations, multiplications and additions. The calculation amount is m $log_2m$ in the general case. Therefore, this requires high speed processors to calculate in real time, which can calculate floating point. This study developed improved fast Walsh transform based on dyadic-ordered fast Walsh transform, then regenerated signal flow graph of improved fast Walsh transform, and used it for digital filtering, and then measured fundamental frequency and harmonics for current and voltage signals of power system.

• 전기학회논문지
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• 제60권7호
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• pp.1331-1338
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• 2011

This paper proposes a method for frequency control of islanded microgrid with battery energy storage system. For frequency control of islanded microgrid, battery energy storage system uses a phase locked loop algorithm with positive sequence components for a fast frequency estimation. Microgrid is a power system with small inertia because it has small capacity generators and inverter systems for renewable energy. So, Islanded microgrid's frequency varies fast and large as small generation and load changes. To reduce frequency variation of islanded microgrid, it needs a device with fast frequency response. For fast frequency response, a fast frequency tracking is important. To show the validation of proposed fast frequency tracking algorithm, battery energy storage system with proposed algorithm is tested in microgrid pilot plant.

• 한국통신학회논문지
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• 제28권12A호
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• pp.991-1001
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• 2003

CCFH(Candidatecasting Fast Handoff) 알고리듬은 기존의 Mobile IP에 멀티캐스팅을 결합한 고속 핸드오프의 성능을 능가하며, B/W 효율성 측면에서 역시 뛰어난 성능을 보이는 새로운 핸드오프 방법이다. 이 알고리듬은 L2 정보를 이용, L2 핸드오프가 발생하기 전 미리 멀티캐스팅하여 L3 핸드오프 지연을 타 방법에 비해 획기적으로 줄인다. 본 논문에서는 제안된 핸드오프 방법을 소개하고, 기존 MIP(Mobile IP)의 기본적인 핸드오프 방법뿐만 아니라 다른 핸드오프 방법들과의 비교 분석을 통하여 제안된 방법의 성능이 우수함을 확인한다.