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민간발전사업 촉진을 위한 신재생에너지 의무공급량의 비율
최재호,이재헌,Choi, Jae ho,Lee, Jae-Heon 한국플랜트학회 2015 플랜트 저널 Vol.11 No.4
본 논문에서는 2012년 시행된 신재생에너지공급의무화제도(RPS)에 따른 민간발전사들의 RPS 의무이행 현황을 알아보고 신재생에너지 공급인증서의 발급량 부족 및 거래시장에서의 심한 가격변동을 발전사업자들의 RPS 이행시 장애요인으로 분석하였다. RPS시행 이전에 추진하여 최근 준공한 동두천복합발전소에 대한 RPS이행방안 구성결과 연평균 약 334억원의 의무이행비용이 산출되었으며, 해당비용을 당초 사업타당성 검토 기초자료에 반영한 결과 내부수익률이 계획대비 31.8% 저하됨을 알 수 있었다. 신재생에너지 의무공급량의 비율이 해마다 증가하여 2024년부터는 전년도 발전량의 10%를 신재생에너지로 공급해야 하는데 RPS 의무공급 대상자로의 편입 초기부터 10%의 의무공급량을 이행해야 하는 신규 발전소의 경우 의무이행비용 과다로 사업성은 더욱 낮아지므로 의무공급량의 비율을 기존의 12단계에서 17단계로 완화하는 방안을 제시하였다. 즉, 동두천복합발전소의 이행비용을 기준으로 최초 2%부터 매년 0.5%씩 점진적으로 10%까지 높였을 때 내부수익률은 6.23%로써 처음부터 10%의 비율로 공급할 경우 산출한 내부수익률 4.18%보다 약 49%의 사업성 향상 효과를 얻을 수 있어 제도개선이 민간발전사업 촉진에 기여할 것으로 판단된다.
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최재호,정미자,정도연,오덕환 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.10
Sasang constitutional medicine is a major branch of Korean traditional oriental medicine. Constitutions ofSasang medicine are classified into Taeyangin, Taeumin, Soyangin, and Soumin. We investigated immunostimulatory activities of fermented soybean product (FSP) extracts and their major bioactive compounds, isoflavone glycosides in primary immune cells isolated from the blood of Soyangin, Taeumin, and Soeumin volunteers. Results showed that the cell proliferation, nitrite, tumor necrosis factor (TNF)-a mRNA, interleukin (IL)-6 mRNA, inducible nitric oxide synthase (iNOS) mRNA, cyclooxygenase-2 (COX-2) mRNA, TNF-a protein, and IL-6 protein production of immune cells treated with a 70% ethanol Doenjang extract (DJ), a 70% ethanol Kochujang extract (KCJ), and a 70% ethanol Cheonggukjang extract (CGJ), respectively, were significantly increased, and its immunostimulatory activities by both DJ and CGJ was higher than that of KCJ in primary immune cells isolated from the blood of Soyangin volunteers. However, the cell proliferation, nitrite, TNF-a mRNA, IL-6 mRNA, iNOS mRNA, COX-2 mRNA, TNF-a protein, and IL-6 protein production by both KCJ and CGJ was higher than that of DJ in primary immune cells isolated from the blood of Taeumin and Soeumin volunteers. The major bioactive compounds, isoflavone-glycosides, in FSP were daidzin, glycitin, and genistin. Daidzin, glycitin, and genistin were used to treat primary immune cells in the same condition, the cell proliferation; iNOS mRNA expression and nitrite concentration of daidzin, glycitin, or genistin-treated immune cells isolated from the blood of Soyangin volunteers was higher than that of Taeumin and Soeumin volunteers. The effect of DJ and isoflavone glycosides on immunostimulatory activities showed similar trends.
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재료지각 데이터: 군집분석을 이용한 신뢰성 검정과 재료의 지각성질 분석
최재호 한국재료학회 2025 한국재료학회지 Vol.35 No.1
Humans have the ability to perceive an object’s material and properties instantaneously, and use this information to prepare for future actions. Material perception is not only an important factor for humans but also for artificial intelligence robots that are being developed. In addition, material perception is one of the important design requirements in selecting materials suitable for the products desired by consumers and pursued by designers. Because it is impossible to perform material perception using an exact formula, it is determined from tendencies that are identified in surveys. In this study, surveys with a binary selection were conducted, presenting participants with pairs of bipolar adjectives and asking them to choose one of two. After multiple surveys were conducted all the data were merged. Before merging the data, to ensure the reliability of the data homogeneity and correlation were tested using hierarchical clustering, correlation coefficient, and k-means cluster analysis. Afterwards, the merged data was used to analyze universal and comparable perceptual qualities of various material classes using relative frequency and hierarchical cluster analysis.
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최재호,김상주,김기환 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.1
The variation of SME by the cyclic deformation process that, Fe-30Mn-5Si-1Co is annealed at 600℃ after 4.5% deformation has been studied. The cyclic deformation effect was investigated by measuring SME using the method of tensile cyclic deformation and bending cyclic deformation. In the result of measurement of SME by the tensile cyclic deformation, SME reached at constant value with small deviation after gradually increased until 7 cycle. And the bending cyclic deformation showed similar result. Investigation of the variation of the microstructure by cyclic deformation using X-ray and optical microscope showed that by the cyclic deformation the amount of ε martensite increased and the variants were gradually oriented. We could know that the increase of ε martensite and the re-orientation of the variants is concerned with the increase of SME. And after the saturation, the SME was no more increased. In the result of the measurement of Neel temperature, Neel temperature gradually increased and reached at constant value. This means that the gradual stabilization of matrix hinders the increase of ε martensite. A_s showed the same inclination, too. The addition of Co to improve the shape memory effect of FeMnSi alloys did not affect the enhancement of corrosion property nearly.
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최재호 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
Wheeled luggage has become a necessity for travel, and there is a wide range of products on the market. Many of theseproducts are of a high quality, both functionally and aesthetically, but nevertheless, these products can suffer damage duringuse. For example, wheels or handles can fall off or the luggage body can be deformed or destroyed. Therefore, in this study,we evaluate selection method for appropriate materials to prevent damage to the luggage body, even under harsh usageconditions. The material selection method is a combination of two methods. One is an engineering-based material selectionmethod using tangible material properties, and the other is a product personality-based material selection method usingintangible material properties. First, the design requirements are described in terms of function, constraints, personality,and objectives. Subsequently, materials are selected from each of these perspectives. Function represents the product function,and constraints are the essential conditions that the product must have. Materials that satisfy these conditions are, thus,selected. Then, the material class is determined by the product personality, which is based on the consumers' perception ofmaterials. Finally, the selected materials are ranked using the objectives, and the final material is selected by comparing thesupporting information between the materials in the upper ranking.
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