• 한국가금학회지
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• 제34권1호
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• pp.53-56
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• 2007

ME가와 단백질 수준이 백세미 육계의 생산성과 경제성에 미치는 영향을 알아보기 위하여 시중에 판매되는 육계 초이 및 전기 사료를 T1로 하여 전기(starter) 및 육성기(grower) 사료로 각각 이용하였고, T1 사료의 ME가와 조단백 함량을 하향 조정한 세 처리구 등 총 4가지 사료(전기: T1; ME 3,040, CP 21.40%, T2;ME 2,950, CP 20.62%, T3; ME 2,950, CP 19.90%, T4; ME 2,900, CP 18.50% 그리고 후기: T1; ME 3,070, CP 20.86%, T2; ME 3,000, CP 19.70%, T3; ME 3,000, CP 18.70%, T4; ME 2,920, CP 18.00%)를 실용 산란계 암컷(Hy-Line)과 육용 종계 수컷($Ross^{(R)}$)을 인공 수정하여 부화시킨 백세미 초생추 360수(4처리, 6반복, 반복당 15수)에 공시하여 5주간의 사양 시험을 실시하였다. 증체량은 T1구가 다른 세 처리구에 비해 가장 높았고 사료 섭취량 또한 T1구가 가장 높았다. 사료 전환율도 T1구가 가장 좋았다. 생산 지수에서도 T1이 153으로 T2: 112, T3: 108 그리고 T4: 101 보다 유의하게 높았다. 또한 경제성 분석에서도 T1이 다른 처리구에 비하여 현저하게 우수하였으며 kg 증체당 사료비가 가장 낮았다. 그 다음으로 T4, T3, T2 순이었다. 결론적으로 백세미의 증체량과 사료 요구율 및 경제성을 고려할 때 기존의 육계 사료를 급여 시 생산성이 가장 높았으며, 사료의 ME가와 조단백질 함량을 하향 조정할수록 생산성이 저하되었다.

• 산업경영시스템학회지
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• 제37권4호
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• pp.82-89
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• 2014

Recently, the mineral resource protection policies and regulations in production countries of natural resources including rare metals are becoming more stringent. Such environment makes which market has malfunction. In other word, those are not perfect or pure market. Therefore because each market of natural resources have special or unique characters, it is difficult to forecast their market prices. In this study, we constructed several models to estimate prices of natural resources using statistical tools like ARIMA and their business indices. And for examples, Indium and Coal were introduced.

• 공업화학
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• 제32권2호
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• pp.197-204
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• 2021

본 연구는 건축용 자재인 목재 및 플라스틱의 연기 위험성 평가에 대하여 새로 고안된 연기성능지수-V (smoke performance index-V, SPI-V), 연기성장지수-V (smoke growth index-V, SGI-V), 연기위험성지수-VI (smoke risk index-VI, SRI-VI)를 중심으로 조사하였다. 시험편은 가문비나무, 나왕, polymethylmethacrylate (PMMA), polycarbonate (PC)를 사용하였다. 연기 특성은 콘칼로리미터(ISO 5660-1) 장비를 사용하여 시험편에 대하여 측정하였다. 연소반응 후 측정된 연기성능지수-V는 PMMA를 기준으로 1.0~3.4로 나타났다. 연기성능지수-V에 의한 연기위험성은 PC, 가문비나무, 나왕과 PMMA 순서로 증가하였다. 나왕과 PMMA는 유사한 값으로 나타났다. 연기성장지수-V는 PMMA를 기준으로 1.0~9.2로 나타났다. 연기성장지수-V에 의한 연기위험성은 PMMA, PC, 가문비나무, 나왕의 순서로 증가하였다. 모든 시편의 CO 피크 발생속도는 0.0021~0.0067 g/s로 측정되었다. 결론적으로 연소가 용이한 물질은 연기성능지수-V가 낮고, 연기성장지수-V가 높기 때문에 화재로 인한 연기위험성이 높은 것으로 이해된다. 이는 총괄적으로 연기위험성지수-VI로 정리된다.

• Journal of Biosystems Engineering
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• 제43권2호
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• pp.119-127
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• 2018

Purpose: Fermented feedstuffs have been found to improve productivity, reduce manure odor, and increase immunity. However, because there is not a commercialized pelletizing system for fermented total mixed ration (TMR) for pig feeding in Korea, a pelletizing system using TMR fermented feed was developed. Methods: The particle size, density, and volumetric density of the TMR feeds used in the test were measured. The pellet durability index (PDI, %) value of the pelletized TMR feed based on its moisture content, and the amount of pellet production based on the rotation speed of the compression roller were measured. Results: The test materials, TMR1 and TMR2, were approximately compressed to 387 kg/m3 with 18.2% (w.b.) and 544 kg/m3 with 22.2% (w.b.), respectively. Throughout this pellet molding test, the moisture content from 15 to 20% (w.b.) of mixture feedstuffs, including fermented forage, could be used for pellet molding. Based on the results, a small-scale pellet molding system of fermented TMR was designed and manufactured for pig farms. As rotation speed increased, the throughput increased, whereas the moisture content decreased by approximately 2% (w.b.) because of pellet molding. The best yield of pellets with 94.2% PDI was of 536 kg/h at 135 rpm rotation speed. Conclusions: Although the throughput of the prototype increased as the rotation speed increased, it was difficult to operate because of the greater noise and the lower PDI (%) at the higher rotation speed of the pellet molding rotor. It was found that the best production of pellets using the prototype was 536 kg/h having a PDI of 94.2% or more at a rotation speed of 135 rpm.

• 한국경제지리학회지
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• 제15권1호
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• pp.77-94
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• 2012

본 연구의 목적은 우리나라 지역 산업의 수직적 생산 분화를 분석하는 데 있다. 본 연구에서는 2005년 16개 지역 간 산업연관표를 대상으로 현시비교우위지수를 적용하여 지역 산업의 이출경쟁 및 이입대체 능력을 분석하였고 평균전파길이를 추정하여 산업의 분화 정도를 평가하였다. 그 결과로 우선, 경남지역에서는 전기가스수도업에 대해, 인천, 광주 지역에서는 소비제조업에 대해 이출 경쟁력 및 이입 대체 경쟁우위가 나타났다. 또한 평균전파길이는 해당 지역이 공간적, 사회경제적으로 인접할수록, 간접 생산유발효과의 비중이 클수록 높게 나타났다. 산업기반이 발달한 지역일수록, 타 산업에 중간재를 공급하는 기능이 강할수록 생산 사슬 내에서 전방에 위치하였다. 마지막으로 대규모 공단 입지 지역의 제조업 및 서울 소재 서비스업은 전, 후방 평균전파길이가 모두 길게 나타나 이들 산업의 분화 정도가 높으며 산업군의 동반성장을 유도하는 선도 산업의 성격을 갖는다고 볼 수 있다.

• 수산해양기술연구
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• 제53권1호
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• pp.12-18
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• 2017

Lots of fishery stocks are overexploited and the overcapacity exists in Korean fishing fleets. One of the reasons is technological development, which increases the efficiency of the vessels continuously. The analysis was conducted to identify the change of fishing power index to develop the vessel and gear technology that may have improved the fishing efficiency of the offshore large powered purse seine fishery from 1960s to 2010s. Gross tonnage and horse power per fishing vessel was increased annually. Fishing gear material was changed to the knotless webbing to settle faster. Fishing equipments was modernized and supply rate was also increased. Therefore the relative fishing power index in the offshore large powered purse seine fishery increased from 0.4 in 1970 to 1.0 in 1980, to 1.5 in 2000 and to 1.6 in 2010, but the rate of increase slowed down gradually. The results are expected to contribute to reasonable fishery stock management.

• 대한토목학회논문집
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• 제43권5호
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• pp.675-687
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• 2023

한반도 비무장지대에 인접한 접경지역은 DMZ(DemilitarizedZone) 그린평화 지대화를 위한 그린데탕트(GreenDétent) 실천무대로 주목 받고있다. 본논문은 접경지역에 계획된 생태·환경 분야 산업·인프라 사업의 복합적 성격을 판단 할 수있는 항목으로 구성된 프로슈밍지표(Prosuming-index)를 제안하고, 이 를 통해 그린데탕트 실천 대상지로서의 잠재력과 방향성을 시각화 하였다. 그 결과, 접경 지역중 인천·강화 지역은 '물류·인적 네트워크 중심 권역이자 특화 농수산물 생산지' 로서, 경기 북부지역은 '스마트기술 활용 산업을 기반으로하는 교류 네트워크 중심권역' 으로서, 강원 서부지역과 경기 연천 지역은 '탄소 감축 기술을 골자로 하는 생산-소비 복합권역' 으로서, 강원 동부지역은 '재생에너지 산업을 통한 유휴·노후 인프라의 그린 인프라 전환권역' 으로서, 크게 4가지 권역으로 그린데탕트 실천 잠재력을 유형화 할 수 있었다.

• 원예과학기술지
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• 제33권6호
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• pp.932-940
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• 2015

One of the main factors restricting production of triploid seedless watermelon is poor germination due to weak embryos, thick seed coats, and larger air spaces. This study was carried out to investigate the priming effects of different concentrations of chemicals, including hydrogen peroxide ($H_2O_2$), fusicoccin, and gibberellic acid (GA) on germination and seedling uniformity of triploid watermelon (Citrullus lanatus). Three commercial triploid cultivars, Seedless Plus, Sinus, and Sizero, were pretreated with water and different levels of $H_2O_2$ (2 and 4%), fusicoccin (FC: 1, 5, and $10{\mu}M$), and GA (1, 5, and $10{\mu}M$). The present findings helped to find optimal priming conditions for improving germination of triploid watermelon. Treatment with $5{\mu}M$ GA and hydropriming helped to break seed dormancy, enhancing the final germination percentages in all triploid cultivars and increasing the germination index in Sizero. These seed-priming treatments could be used on large scale for industrial applications. Moreover, hydropriming provides a simple, effective, and costless method to improve seed germination and seedling vigor of Sinus and Sizero varieties.

• The Journal of Asian Finance, Economics and Business
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• 제7권3호
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• pp.149-156
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• 2020

The study aims to investigate a close relation between macro and non-macro variables on stock performance of tourism companies in Korea. The sample used in this study includes monthly data from January 2001 to December 2018. The stock price index of the tourism companies as a dependent variable are obtained from Sejoong, HanaTour, and RedcapTour as three leading Korean tourism companies that have been listed on the Korea Stock Exchange. This study assesses the tourism stock performance using the quantile regression approach. This study also investigates whether global crisis events as the Iraq War and the global financial crisis as non-macro variables have a significant effect on the stock performance of tourism companies in Korea. The results show that the oil prices, exchange rate and industrial production have negative coefficients on stock prices of tourism companies, while the effects of tourist expenditure and consumer price index are positive and significant. We estimate the result of quantile regression that non-macro determinants have statistically a significant and negative effect on tourism stock performance because the global crisis could threaten traveler's safety and economy. Overall, empirical results suggest that the effects of macro and non-macro variables are statistically asymmetric and highly related to tourism stock performance.

• International Journal of Industrial Entomology and Biomaterials
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• 제46권1호
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• pp.1-8
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• 2023

Mulberry (Morus spp.) production is a vital activity in sericulture along with rearing of silkworms (Bombyx mori L.) for silk production. The Sericulture Research and Development Institute (SRDI) conducted a study that evaluated 11 mulberry varieties, including nine newly-evolved mulberry hybrids and two check varieties. These mulberry varieties were fed to silkworm hybrid, DMMMSU 115 x 100. The rearing performance of DMMMSU 115 x 100 was determined based on the silkworm economic traits such as weight of 10 matured larvae, cocoon weight, shell weight, shell percentage, cocoon yield, reelability percentage, filament length and filament size. Six silkworm rearing trials were conducted with 50 silkworm larvae per treatment in three replicates. The data were analyzed in a one-way Analysis of Variance. Significant differences were tested further using Tukey's Honest Significant Difference. Mulberry varieties that garnered an evaluation index value of higher than 50 were identified and selected. Results of the study revealed significant variations among the mulberry varieties based on the parameters gathered except on the reelability of cocoons, filament length and size. Matured silkworm larvae fed with Alf 55 were significantly heavier and higher cocoon yield compared to those fed with Alfonso and S₅₄. Alf 32, Alf 55, Alf 58, Bat 37 and Bat 73 were identified as potential varieties and highly recommended as feed for the silkworm hybrid, DMMMSU 115 x DMMMSU 100.