• 한국전산유체공학회지
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• 제22권1호
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• pp.37-42
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• 2017

Infrared signals are frequently used to detect objects exposed to wide variety of environmental conditions. Detection by infrared signature is accomplished by distinguishing objects by using the IR radiant contrast between objects and the background. There are several methods of estimating the IR radiant contrast. The inverse distance weighting method, which is one of the IR radiant contrast estimation method using the effect of distance from objects, is known to be an effective way to analyze radiant contrast for complex backgrounds. However this method has a disadvantage of requiring a long calculation time. In this study we propose a statistical method of estimating the IR radiant contrast by using randomly selected pixels of arbitrary number among background pixels to reduce calculation time. Some measured IR images in MWIR and LWIR regions are used to test the applicability of the method proposed and we found that the proposed method is very effective in determining the IR radiant contrast showing very rapid estimation with minar accuracy loss.

• Structural Engineering and Mechanics
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• 제43권5호
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• pp.691-709
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• 2012

This paper provides a variety of viewpoints to illustrate the mechanism of the deck-stay interaction with the appropriate initial shapes of cable-stayed bridges. Based on the smooth and convergent bridge shapes obtained by the initial shape analysis, the one-element cable system (OECS) and multi-element cable system (MECS) models of the Kao Ping Hsi Bridge in Taiwan are developed to verify the applicability of the analytical model and numerical formulation from the field observations in the authors' previous work. For this purpose, the modal analysis of the two finite element models are conducted to calculate the natural frequency and normalized mode shape of the individual modes of the bridge. The modal coupling assessment is also performed to obtain the generalized mass ratios among the structural components for each mode of the bridge. The findings indicate that the coupled modes are attributed to the frequency loci veering and mode localization when the "pure" deck-tower frequency and the "pure" stay cable frequency approach one another, implying that the mode shapes of such coupled modes are simply different from those of the deck-tower system or stay cables alone. The distribution of the generalized mass ratios between the deck-tower system and stay cables are useful indices for quantitatively assessing the degree of coupling for each mode. These results are demonstrated to fully understand the mechanism of the deck-stay interaction with the appropriate initial shapes of cable-stayed bridges.

• 응용통계연구
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• 제33권1호
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• pp.11-23
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• 2020

표본조사는 비용과 시간을 절약하면서도 주어진 정확성을 만족하는 통계를 얻을 수 있다. 그러나 최근에는 다수의 무응답 발생으로 인해 조사의 정확성이 크게 떨어지고 있다. 무응답은 다양한 이유로 발생하고 있으나 무응답이 관심변수와 함수 관계가 있는 경우에는 이 정보를 이용하여 무응답을 적절히 처리해야 추정의 정확성이 유지될 수 있다. 최근 Chung과 Shin (2017, 2019), Min과 Shin (2018)은 응답률이 관심변수의 지수 또는 선형함수이고 초모집단모형의 오차가 정규분포를 따를 때 무응답으로 인해 발생한 편향을 제거함으로써 추정의 정확성이 향상되는 것을 확인하였다. 이에 본 연구에서는 사업체조사에서 초모집단모형의 오차가 감마분포 또는 로그-정규분포를 따르는 경우에서의 무응답 편향보정 추정량을 제안하였다. 또한 모의실험을 통하여 제안된 추정량의 우수성을 확인하였다.

• 한국간호교육학회지
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• 제17권2호
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• pp.257-266
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• 2011

Purpose: The aim of this study was to elucidate the themes involved in a nursing experience of caring for extremely low birth weight infants (ELBWIs) in a neonatal intensive care unit (NICU). Methods: Interviews with 6 nurses in various positions and observations in a level III NICU were conducted. The transcribed interview contents and observational notes were reviewed to analyze the data and conceptualize major themes. Results: Three major themes were identified: the fears expressed by the nurses regarding taking care of ELBWIs, reasons for persistent fears, and overcoming fears and gaining intuition. Nurses were afraid of the following factors: the physical fragility of the infants; the possibility of developing disabilities in the future; and the rapid changes in infants' physical condition. These fears were reduced when nurses had developed intuition and confidence in taking care of ELBWIs through various situational experiences. Conclusion: NICU nurses may benefit from obtaining more opportunities to participate in various learning experiences with simulated nursing situations in a variety of patient groups. Applying knowledge and skills into various nursing situations in an integrative way may contribute to enhancing nurses' confidence in nursing practice.

• 패션비즈니스
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• 제15권6호
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• pp.1-22
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• 2011

This paper is a study on the information required for developing Korean clothing products intended for Chinese students in Korea and for opening markets of Korean clothing and brands in China. It analyses the buying behaviors, purchasing ability, the favourite apparel type for clothing, and satisfaction with Korean clothing and brands of Chinese students in Korea, with which it seeks a program for South Korea branding to enter into the Chinese clothing market. Three hundred fifty seven students of Hannam University and PaiChai University Chung nam National University in Daejeon-city took part in this study. This paper adopts Descriptive Analysis, Crossing Analysis, Bivariate Correlations, and One-way ANOVA in SPSS 17.0 with Post Hoc Multiple Comparisons to know about the impact of demographic variables of Chinese students in Korea on buying information sources, the criteria for store selection, buying capacity, praise degree on various properties of Korean clothes products and their satisfaction with Korean clothes products. The first proposal of expanding China market for Korean merchants is to achieve maximum sales based on sales promotion strategies, such as the credit card corporations, the store display and sales person service development, SPA, design size development, and to upgrade consumption values. The second proposal is Korean clothes corporations should open the Internet shopping corresponding to the physical stores, the most frequently used information source of Chinese students is the network, from the age distribution of Internet users in 2008 in China, population above 10 and below 30 accounts for 66.7% of all users, In recommending clothes made in Korea to Chinese young people, on-line advertising will get better effects than other strategies, specially during advertisement, they should take good use of Korean television shows and variety shows or help Chinese poor areas to do the social contribution hereby to improve the public image of Korean clothes corporations, which can bring good sale promotion effects as well.

• 지역사회간호학회지
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• 제18권4호
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• pp.662-672
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• 2007

Purpose: In recent years, the problem of runaway youths, which is rapidly increasing and worsening in nature, has emerged as a serious problem to individuals, home and the society as a whole. Against this back drop, this study was designed to illuminate the danger signals through extensive analysis of factors influencing the running away of middle-school students and, on this basis, build a forecast model on runaway middle-school students. Method: The subjects of this descriptive survey on the causal relation were 592 subjects enrolled in middle schools selected through convenience sampling. The data collected from June 19 to July 19, 2003 were analysed through the SPSS 10.0 program. The differences between the runaway group and the non-runaway group were determined through chi-square and t-test. Also logistic regression analysis was conducted on the basis of the purposeful selection method for constructing the forecast model. Result: The findings are as follows: Individual-related factors predicting runaway middle-school students were smoking experience, delinquent experience, psychosomatic symptoms and stress. A home-related factor was attachment to family. A society-related factor was the number of delinquency friends. Conclusion: The findings of this study suggest that a broad intervention program should be provided to middle-school students' culture related to runaway group. It is also recommended that a variety of individual, home and society-related programs should be developed for the runaway group.

• 한국육종학회지
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• 제41권4호
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• pp.547-551
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• 2009

"칠보"는 국립식량과학원 영덕출장소에서 2007년에 육성한 쌀 품위가 좋고 밥맛이 양호하며 바이러스병에 강한 중만생 벼 품종으로 주요 특성과 수량성을 요약하면 다음과 같다. 1. 출수기는 평야지의 보통기 재배에서 8월 15일로 "화성벼"보다 3일 늦은 중만생종이다. 2. 주당수수는 18개로 "화성벼"보다 3개 많으며 수당립수는 적은 편이고 등숙비율은 더 높으며 현미천립중은 비슷한 중립종이다. 3. 심복백이 거의 없고 "화성벼"보다 맑고 투명하며 도정률 및 완전미율이 높고 아밀로스 및 단백질함량은 비슷하며 밥맛은 "화성벼"보다 양호하다. 4. 불시출수와 수발아가 않되는 편이고, 위조현상에 강하고 성숙기 엽노화가 느린 편이며 내냉성은 "화성벼"보다 출수지연은 심하고 임실률은 중정도이다. 5. 잎도열병은 중도저항성이며, 줄무늬잎마름병에는 강하나 흰잎마름병, 오갈병 및 검은줄오갈병에는 약하고 벼멸구 등 충해에는 감수성이다. 6. 쌀수량은 5.57 MT/ha로 "화성벼"보다 8% 증수 되었으며, 이모작재배에서는 5.33 MT/ha, 만식재배에서는 4.60 MT/ha의 수량성을 보였다.

• KIEE International Transactions on Electrophysics and Applications
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• 제4C권2호
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• pp.55-59
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• 2004

Throughout manufacturing processes, pulse shaping is required for material processing and it is regarded as an important (actor according to the specific characteristics of materials. Therefore, this study suggests a highly appropriate pulse shaping technique using a multi-switching method. This is a pulse superposition method in which one flash lamp can consecutively turn on by the double switching of the discharging system. It is possible to construct a variety of pulse shapes and pulse widths by the consecutive trigger of the silicon-controlled rectifiers (SCR) of a PIC (program integrated circuit) one-chip microprocessor. The use of this technique can provide a number of advantages to people who require suitable pulse shaping for particular applications such as welding, cutting, and drilling.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1501-1503
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• 1999

The $(Sr_{0.85}Ca_{0.15})TiO_3$(SCT) thin films are deposited on Pt-coated electrode$(Pt/TiO_2/SiO_2/Si)$ using RF sputtering method. Ag, Cu, Al, Pt films for the formation of top eletrode were doposited on SCT thin films by thermal evaporator and sputtering. The effects of top electodes have be studied on SCT samples with a variety of top electrode materials.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1526-1532
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• 2011

Railway bridges are highly susceptible to resonance due to the equidistant axle load with constant speed of train. Thus, it is necessary to verify dynamic characteristics and quantities against dynamic guidelines. Recently, many newly developed bridge systems have been developed for medium span length between 30m and 40m. However, less variety of bridge systems are available for span length between 45m and 50m. Steel box girder is considered as an alternative for span length between 45m and 50m. This study is to investigate the dynamic properties and safety of steel box railway bridge. Modal properties are extracted and moving load analyses are performed using mode superposition method. The results are then compared to various standards.