• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.179-187
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• 2022

The project performances can be measured in terms of meeting the project schedule, budget, and conformance to functional and technical specifications. Numerous studies have been conducted to examine the causes and effects of change orders for both vertical and horizontal construction, respectively. However, these studies mainly focus on a single project type, so this paper examines the impact of change order for cost growth and schedule overruns using four different building types to close the gap in the change order research area. A total of 211 building projects are collected from four building types: healthcare, residential, office, and education. Statistical analyses using ANOVA tests and linear regression models are used to examine the created metric $CO/day on the cost and schedule impacts. The results found that mean $CO/day values were not statistically different among building types, and that the sum of change orders is a statistically significant predictor of $CO/day. The results will help project stakeholders mitigate the negative change orders effects can be a challenge for project managers and researchers alike.

• 한국군사과학기술학회지
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• 제23권1호
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• pp.76-86
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• 2020

Technology growth curve methodology is commonly used in technology forecasting. A technology growth curve represents the paths of product performance in relation to time or investment in R&D. It is a useful tool to compare the technological performances between Korea and advanced nations and to describe the inflection points, the limit of improvement of a technology and their technology innovation strategies, etc. However, the curve fitting to a set of survey data often leads to model mis-specification, biased parameter estimation and incorrect result since data through survey with experts frequently contain outlier in process of curve fitting due to the subjective response characteristics. This paper propose a method to eliminate of outlier from a technology growth curve using M-estimator. The experimental results prove the overall improvement in technology growth curves by several pilot tests using real-data in Defense Science and Technology Survey reports.

• 한국컴퓨터정보학회논문지
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• 제15권10호
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• pp.137-145
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• 2010

본 논문은 USN(Ubiquitous Sensor Network) 기술 기반의 적외선 센서를 사용한 비접촉식 식물 생장 측정 시스템을 제안한다. 제안된 시스템은 식물 생장을 측정할 때 식물의 생장 피해를 줄이기 위하여 비접촉 센서를 사용하였다. 이 시스템은 직경, 단면적, 비대 형상과 같은 식물 생장 요소를 실시간 비접촉 방식으로 측정할 수 있다. 측정된 데이터는 센서 네트워크 기술을 사용하여 원격 서버까지 전송되고, 서버에서 저장 및 분석되며, 최종적으로 분석된 데이터는 사용자에게 제공될 수 있도록 구성하였다. 본 논문에서 제안된 식물 생장 측정시스템은 측정 방식과 장치에 비접촉 적외선 센서를 사용하여 설계 및 구현을 하였다. 그리고 시스템의 성능은 필드에서 측정 실험을 통하여 검증해 보았다.

• The Korean Journal of Ecology
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• 제19권2호
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• pp.125-139
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• 1996

The relationships between environmental factors and the establishment and growth of oak seelings were studied in the greenhouse. The early seedling performances of three oak species (Quercus mongolica, Quercus serrata, Quercus variabilis) were compared. Mean seed weight was the biggest in Q. variabilis, and the smallest in Q. serrata, and the germination rate was higher in Q. variabilis than in Q. mongolica and Q. serrata. The germination rate was significantly affected by seed weight class in Q. serrata, but not in Q. mongolica. Emergence of oak seedlings was similar in all three oak species, and especially the first leaf emergence increased about twenty days after germination. An experiment was designed using three environmental factors (light, soil moisture, fertilizer) to compare the response of the three oak species. Light and soil moisture significantly affected the seedling height growth of Q. variabilis, but the effect was marginal in Q. mongolica and Q. serrata. However, growth of seedling biomass was significant in all three oak species. In contrast, fertilizer did not affect seedling growth of any of the oak species. Q. variabilis is expected to grow well in large gaps because it is very sensitive and responds well to high light and high moisture conditions. Q. mongolica and Q. serrata are relatively tolerant to shade but may need gaps for the seelings to grow into saplings.

• 산업경영시스템학회지
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• 제43권1호
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• pp.79-86
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• 2020

The effects of R&D investment on innovation such as patents and intangible assets, and the effect on the corporate performance such as revenue and profit growth, were analyzed using path analysis. In particular, this study compared and analyzed the performances of non-cooperative R&D and cooperative R&D. The results of this study are summarized as follows. First, R&D investment has a significant impact on innovation performance. This supports the existing research results. Second, patents have a significant impact on intangible asset growth. Third, in the case of corporate groups carrying out cooperative R&D, intangible asset growth forms a significant causal relationship with revenue growth. Fourth, in case of cooperative R&D, intangible asset growth has a significant mediating effect between patent and revenue growth. Like the existing research, the results of this research support the innovation performance of R&D investment. It also supports the existing argument that the results of cooperative R&D are more favorable to increase corporate value. However, unlike the existing research, we found a path leading to increased revenue through patents and intangible assets, and confirmed that such a path is likely to be achieved through cooperative R & D rather than internal R&D.

• Journal of the Korean Data and Information Science Society
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• 제25권4호
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• pp.847-855
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• 2014

최근 몇 년간 여자프로골프는 상금액과 경기력에서 타 종목보다 크게 성장을 하고 있다. 그 이유로는 아시아지역에서의 스포츠마케팅의 활성화와 국제무대에서 대한민국 여자골프 선수들이 좋은 성적을 거두며 남자골프나 다른 여성스포츠 종목보다 인기가 상승하였기 때문이다. 또한, 상금액수가 타 종목과 비교해서 월등히 많고 골프와 연관된 금융상품이나 기타 의류 및 골프용품 산업의 발전 등으로 선수들의 경제적 혜택이 좋아졌다고 할 수 있다. 이러한 좋은 환경 덕분에 여성 스포츠 유망주들이 계속 유입되고 있고, 과학을 이용한 골프 장비의 발달로 선수들의 경기력이 날로 향상되고 있다. 본 연구에서는 2009년부터 최근 5년간 활동한 선수들의 반복 측정된 자료를 토대로 시간에 따른 경기력 변화를 성장곡선을 활용하여 분석하였다. 성장곡선은 여러 가지 분석방법으로 접근할 수 있으나, 본 연구에서는 반응변수들의 정규분포를 가정하고 고정, 임의효과를 고려할 수 있는 혼합모형을 적용하였다. 분석결과 골프 경기기술 중 드라이브 비거리와 평균 퍼팅은 시간에 따라 발전적이었으나 그린 적중률은 감소하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제8권4호
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• pp.337-342
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• 1995

Two feeding trials were conducted to determine the effect of molasses feeding on the growth performances of bulls. In the first experiment, the straw of a control diet of straw and urea was replaced by molasses of 150 g ($M_{150}$) or $300g{\cdot}kg^{-1}$ ($M_{300}$). The three diets were fed ad libitum to three groups of bulls having five in each and the dietary responses were statistically analyzed in a simple design. The bulls were given fishmeal ($30g{\cdot}hd^{-1}{\cdot}d^{-1}$), wheat bran (0.5% of Liveweight, LW) and allowed grazing for $5hrs{\cdot}d^{-1}$. Molasses supplementation significantly (p < 0.001) increased the dry matter intake (DMI) of the bulls of $M_{150}$ (35.8g) and of $M_{300}$ (42.9g) than the control ($30.4g{\cdot}kg^{-0.75}$). The daily LW gain of the bulls of the $M_{150}$ (982g) was significantly (p < 0.05) higher than the bulls of the control or of the $M_{300}$ diet. In the second experiment, a control group of four bulls was fed a straw diet. Treatment two groups, having four bulls in each, were fed a mixed diet of Leucaena leucocephala and Setaria splendida(1:1, DM basis) with (LSM) and without (LS) molasses at $100g{\cdot}kg^{-1}$. The dietary responses were statistically analyzed in a simple design. The bulls of the LSM diet had significantly (p < 0.05) higher DMI, DM digestibility and LW gain ($128g{\cdot}kg^{-0.75}$, $663g{\cdot}kg^{-1}$ and $419g{\cdot}d^{-1}$, respectively) than the bulls of the LS diet ($98.3g{\cdot}kg^{-0.75}$, $583g{\cdot}kg^{-1}$ and $292g{\cdot}d^{-1}$, respectively). But the differences between the LSM and the control were nonsignificant. It may be concluded that molasses may be utilized as supplement to straw at $150g{\cdot}kg^{-1}$ or forages at $100g{\cdot}kg^{-1}$ diet for the profitable beef production from young growing bulls.

• 벤처창업연구
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• 제15권5호
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• pp.37-50
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• 2020

본 연구는 중소·벤처기업에 대한 기술평가 및 기술금융 지원사업이 기업의 경영성과를 향상시키고 성장기반을 확보하는데 유용한 수단인지 여부를 검증하기 위해 기술보증기금이 직접 기술평가 및 보증을 지원한 3,688개 기업을 표본기업으로 분석하였다. 먼저 대표적 경영성과 지표로서 재무건전성이 우수한 기업과 취약한 기업 간에 기술평가지표 세부 항목별로 유의미한 차이가 있는지 t검증을 실시한 결과, 총 33개 기술평가 세부항목 중 25개항목 (75.8%)에서 재무건전성이 우수한 기업집단과 그렇지 못한 기업집단 간에 기술평가의 유의미한 차이가 있는 것으로 나타나 기술평가지표의 유의성이 비교적 높은 것으로 확인되었다. 그리고 대표자역량, 경영진팀웍, 기술집약도, 시장경쟁력 및 투자타당성 등 5개 구성개념 속성들은 모두 기술사업성에 정(+)의 유의한 영향을 미치고, 기술사업성은 기업의 성장성, 노동생산성 및 재무건전성 등 경영성과에 모두 정(+)의 유의한 영향을 미치는 것으로 나타났다.

• Asian-Australasian Journal of Animal Sciences
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• 제13권9호
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• pp.1296-1303
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• 2000

A series of four experiments was conducted to compare nutritional values of decorticated sunflower meals against soybean meal, in diets for pigs from weaning (Exp. 1 and 2) to finishing (Exp. 3 and 4). All experimental diets were prepared compensating for the energy content by using vegetable oil and the lysine content was matched using synthetic L-Lysine HCl. Twenty-one day old pigs were fed either corn-soybean meal based diet (CSBM) or corn- twice-decorticated sunflower meal based diet (CDSM) for four weeks (Exp. 1). There was no difference in performances between treatment groups. In Exp. 2, corn-non-decorticated sunflower meal based diet (CNSM) was added to the existing two treatments. Twenty-one day old pigs were fed three experimental diets for four weeks. Pigs fed CNSM had a lower weight gain and feed intake than other treatments (p<0.05). There was no difference between pigs fed CSBM and CDSM (Exp. 2). Growth performance of growing pigs was also greater (p<0.05) in pigs fed corn starch-twice- decorticated sunflower meal based diet (CSDSM) than pigs fed corn starch-non-decorticated sunflower meal based diet (CSNSM) during the eight week feeding trial (Exp. 3). There was no difference between pig fed corn starch-soybean meal based diet (CSSBM) and CSDSM (Exp. 3). In Exp. 4, growing pigs were fed three experimental diets (CSBM, CDSM, and barley-twice- decorticated sunflower meal based diet; BDSM) until the slaughter. There was no difference in growth performance of pigs during growing and finishing periods among treatments. However, pigs fed CSBM had a higher carcass dressing percentage (p<0.05) than pigs fed CDSM and BDSM. Pigs fed BDSM diet had a lower fat tissue percentage than other groups (p<0.05). The twice-decorticated sunflower meal can be used as a substitute for soybean meal in pig diets. The performances of piglets and growing-finishing pigs were not affected when soybean meal was replaced by twice-decorticated sunflower meal. This substitution needs the contribution of synthetic lysine and vegetable oil as sources of complementary nutrients to match the nutrient profile.

• Animal Bioscience
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• 제35권5호
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• pp.711-720
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• 2022

Objective: The objective of this study was to determine the appropriate amount of eri silkworm pupae meal (Samia ricini) to add to the broiler diet. Methods: Two hundred 1-day-old male chicks with initial weight at 50.03±0.56 g/chick were divided into four groups (five replicates per group and ten chicks per replicate): a control group fed a corn-soybean diet and experimental groups supplemented with 5%, 10%, or 15% eri silkworm pupae meal. All experimental diets were isocaloric and isonitrogenous and formulated respecting nutrient requirements. Growth performances were collected during the experimental period and other parameters were collected at the end of experiment when broilers reached thirty-eight days old. Results: A higher cold carcass weight and skin yellowness in the broilers fed 10% eri silkworm pupae meal compared with the other groups (p<0.05). Therefore, supplementation with 10% eri silkworm pupae meal is suggested for the broiler diet formulation because it did not cause any serious negative consequences on growth performance, health status, carcass characteristics and meat quality. However, the usage of eri silkworm pupae meal at 15% is not recommend because it led to negative outcomes Conclusion: The addition of eri silkworm pupae at 10% can be used as an alternative protein sources for broiler chickens which provided benefits on cold carcass weight and skin yellowness without adverse effects.