• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 추계학술대회 논문집
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• pp.337-344
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• 1998

Conceptual design of the pantograph for high speed trains of 350km/h is introduced. The aims to be accomplished in the concept design are the good dynamic performance, low noise, aero-dynamic stability. The resulting mechanism of the pantograph have single-arm type structure with bebel gears to reduce noise sources, symmetric structure for the aero-dynamic stability and the special panhead assembly to obtain good dynamic performances.

• 한국음향학회지
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• 제23권2호
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• pp.146-161
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• 2004

기존의 국악원 설계에 있어서 국악음원의 음향 방사 특성을 고려하지 않아, 공연장의 음향목표설정 및 음향조정에 어려움이 있었다. 본 연구에서는 대표적인 국악 음원인 가야금 (현악기), 장고 (타악기), 대금 (관악기), 판소리 창 (성악) 등 4종에 대한 음향 방사 특성을 상세히 측정하여, 그 결과의 적용성을 살펴보았다. 음원을 반무향실의 중앙에 위치시키고, 매 10° 간격으로 음압 레벨을 측정함으로써 지향성을 파악하였다. 측정 결과, 가야금의 경우에는 주파수가 증가함에 따라 무지향성으로부터 지엽이 많아지는 형태로 순차적으로 지향성이 변하였다. 대금의 주요 방사방향은 위쪽이었고, 장고는 저주파수에서 왼쪽 지향성이 오른쪽보다 더 크게 나타난다. 창의 경우에는 주파수가 증가함에 따라 뒤쪽으로는 소리가 거의 전파되지 않는 지향성을 나타낸다. 측정된 국악음원의 지향성을 이용하여 건설중인 부산국립 국악원의 음향 인자들을 예측하였다. 대표적인 두 수음점 들에서 잔향시간, 음압 레벨, C80, LF, STI와 같은 주요 건축 음향 인자들이 음선 추적 기법에 의해 계산되었으며, 무지향성 음원과 국악 음원을 사용하였을 때 음향 인자들 사이에 큰 차이를 보였다. 본 연구에서 제시된 데이터와 설계 방법론 등은 향후 국악원의 설계에 있어서 기본적인 자료로 활용될 수 있다고 사료된다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권11호
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• pp.1725-1733
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• 2019

Objective: Evaluate the partial replacement of soybean meal with different protein sources in piglet feed during the nursery phase in terms of digestibility of feed, nitrogen balance, growth performance and blood parameters. Methods: Experiment I involved 24 crossbred entire male pigs with an initial body weight (BW) of $18.28{\pm}0.7kg$ and used a randomized complete block design consisting of 3 treatments (fish meal, FM; soybean protein concentrate, SPC; and soybean meal, SBM) and 8 replicates, with 1 pig per experimental unit. Experiment II involved 1,843 crossbred male and female pigs with an initial BW of $6.79{\pm}0.90kg$ and was based on a completely randomized design with a $2{\times}3$ factorial arrangement (2 sexes and 3 protein sources) and 13 replicates. Results: The results of Exp. I indicate effects (p<0.05) of dietary protein sources on digestible protein (FM, 17.84%; SPC, 16.72%, and SBM, 18.13%) and on total nitrogen excretion (TNE, $g/kg\;BW^{0.75}/d$) in which pigs fed with SBM-based feed had TNE values that were 5.36% and 3.72% greater than SPC and FM, respectively. In the Exp. II, there was difference (p<0.01) between sexes in the pre-starter I and starter phases, and total period in average daily feed intake (ADFI), which were greater in females, and between the protein sources, ADFI, final weight and daily weight gain. For urea in the pre-starter II and starter phases and glucose in the pre-starter II phase, there was a difference (p<0.05) between protein sources and between sexes, in starter phase in urea concentrations (females: 57.11 mg/dL and males: 50.60 mg/dL). Conclusion: The use of SBM as only protein source influences larger TNE ($g/kg\;BW^{0.75}/d$), reduces the growth performance of piglets and increases plasma urea concentrations in prestarter II phase.

• 산업경영시스템학회지
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• 제34권4호
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• pp.138-144
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• 2011

The design flexibility and robustness have become key factors to handle various sources of uncertainties at the early phase of design. Even though designers are uncertain about which single values to specify, they usually have a preference for certain values over others. In the first and second reports of a four-part paper, a set-based design approach has been proposed for achieving design flexibility and robustness while capturing designer's preference, and its effectiveness has been illustrated with a simple vehicle side-door impact beam design problem. This report presents the applicability of the proposed design approach to the large-scale multi-objective design optimization with a successful implementation of real vehicle side-door structure design.

• Journal of Electrical Engineering and Technology
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• 제10권1호
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• pp.30-40
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• 2015

For a shunt power quality controller (SPQC) the DC side voltage value which is closely related to the compensation performance is a significant parameter. Buy so far, very little discussion has been conducted on this in a quantitative manner by previous publications. In this paper, a method to design the DC side voltage of SPQC is presented according to the compensation performance in the single-phase system and the three-phase system respectively. First, for the reactive current and the harmonic current compensation, a required minimal value of the DC side voltage with a zero total harmonic distortion (THD) of the source current and a unit power factor is obtained for a typical load, through the equivalent circuit analysis and the Fourier Transform analytical expressions. Second, when the DC side voltage of SPQC is lower than the above-obtained minimal value, the quantitative relationship between the DC side voltage and the THD after compensation is also elaborated using the curve diagram. Hardware experimental results verify the design method.

• 복식
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• 제58권3호
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• pp.79-92
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• 2008

The purpose of this study is to develop knitwear design expressed not also Green but also LOHAS using natural yarns(wool and cotton) dyed with various natural sources(sappanwood, indigo plant, turmeric, cochineal, coffee, gallnut, and persimmon juice). This researcher tried to suggest solution scheme through the development of knitwear designs to break from the cottage industry and the limitation of design in Jeju and to preserve of traditional dye with persimmon juice simultaneously. Knitting is the formation of a fabric by the interlooping of one or more sets of yarns with hand knitting or industrial knitting. In hand-knitting, the two fundamental stitches are described as knit depending on the direction of the loop formation, front to back or back to front. In machine-knitting, the direction of loop formation is fixed, unless the stitch is mechanically transferred from front to back needle bed or vice versa. Industrial knitting technology can be divided into two main areas - weft knitting and warp knitting. Each has a different principle of construction. The majority of knitted fabrics for clothing are weft-knitted, and so this study is used weft-knitting and hand knitting technology. To achieve this purpose, researcher tried to present a lot of knitwear designs using yarns dyed with various natural sources focusing on Modern & Sophisticated Image and Elegance & Romantic Image to satisfy adult and missy consumer needs.

• 전자공학회논문지
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• 제52권2호
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• pp.119-124
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• 2015

본 논문은 광원 라인폭이 spectral amplitude coding (SAC) OCDMA 시스템에 미치는 영향을 구하였다. q와 m값에 따라 다양한 코드를 구현할 수 있으므로 symmetric balance incomplete block design(BIBD) 코드를 분석에 사용하였다. 그 결과 입력파워가 큰 경우 ($P_{sr}=-10dBm$) 이상적인 BIBD 코드가 비이상적인 BIBD 코드보다 더 좁은 광원 라인폭이 요구되었다. 그러나 입력파워가 작은 경우 ($P_{sr}=-25dBm$)에는 그 반대로 비이상적인 BIBD 코드가 이상적인 BIBD 코드보다 더 좁은 광원 라인폭이 필요했다.

• 한국의상디자인학회지
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• 제16권1호
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• pp.139-151
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• 2014

Storytelling contributes to easy flowing of cultural contents, and cultural original materials offer the creative subjects of cultural content. Now, in Korea, thanks to the Korean wave and etc, new kinds of cultural contents are requested and the demand for the original materials of storytelling has been increasing.A 5,000-year-old history, Korean traditional culture is the storage of the original materials of storytelling that can offer the creativity and the competitiveness, which are able to secure the national competitiveness. Particularly, there are different kinds of cultural archetype materials in the wedding ceremony and wedding costumes. This research, thus, is aimed at providing the subject materials for the cultural content development which are various and interesting by developing the original materials of storytelling on the wedding ceremony and wedding costumes during the Joseon dynasty. In the study for the wedding procedures in the late of Joseon Dynasty, the original sources within wedding ceremony created in the process where wedding customs in Joseon Dynasty and China were compromised are suggested. Further, in the research for the original sources on the wedding costumes associated the wedding ceremony, the original source of storytelling which are showed in a nation and an individual in the process where the wedding ceremony symbolizes the most important marriage one of the fomalities performed in one's life is suggested.

• 전기학회논문지
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• 제66권4호
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• pp.651-658
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• 2017

This paper proposes an analysis method of performance degradation of antenna due to radio frequency interference between an antenna and adjacent noise sources using active scattering parameters. The radio frequency interference can be analyzed by the measured or simulated scattering parameters and by excited noise sources in the circuit as well. In this paper, a planar inverted-F antenna and a noise source are designed and fabricated to analyze radio frequency interference between the planar inverted-F antenna and noise source. The proposed analysis method uses active scattering parameters, of which verification is experimentally verified, and in simulation as well.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 추계학술대회논문집
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• pp.735-741
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• 2003

A simplified view of array design and application process was introduced. Array design is critical to achieve a successful phased array measurements. A planar microphone array is designed to produce optimum performance and also to fit economic requirement in integrating data acquisition system. Certain performance characteristics are of primary concern when designing arrays. These characteristics include array resolution, spatial aliasing and array sidelobe suppression. Every array has its directional pattern that shows such characteristics. Assuming that a monopole source is located in center, beam-patterns have been simulated varying measurement conditions such as number of sensors. array aperture size, distance between array and source, frequency of interest and so on. Sensor correction was conducted on very channel using magnitudes and phased of FRF with respect to a reference microphone channel. Then with a spiral type array, measurements have been made with two point sources of same frequency in order to investigate array resolving abilities. It is observed that higher frequency source achieves better resolution than lower one does.