• Korean Chemical Engineering Research
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• v.57 no.4
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• pp.455-460
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• 2019

Hydrotreating catalysis refers to a various hydrogenation which saturate an unsaturated hydrocarbon, together with removing heteroatoms such as sulfur, nitrogen, oxygen, and trace metals from different petroleum streams in a refinery. Most refineries include at least three hydrotreating units for upgrading naphtha, middle distillates, gas oils, intermediate process streams, and/or residue. Among them, hydrotreating catalysis for residue are the core of the process, because of its complexity. This article reviews recent progress in tackling the issues found in the upgrading residues by hydrotreating, focusing on the chemistry of hydrodemetallization (HDM) and hydrodesulfurization (HDS). We also discuss the composition and functions of hydrotreating catalysts, and we highlight areas for further improvement.

• Journal of Environmental Science International
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• v.27 no.12
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• pp.1241-1247
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• 2018

This study was conducted to evaluate resistance of 10 different cowpea cultivars which were introduced from the United States against two major root-knot nematodes, Meloidogyne arenaria and M. incognita, that affect greenhouse crop cultivation in Korea. The results showed that the resistance of the tested cultivars to the root-knot nematodes varied with the cultivar. Texas Cream 40 showed moderate resistance to M. arenaria whereas the other cultivars were susceptible. Purple Hull Pinkeye and Texas Pinkeye Purple Hull were found to be resistant to M. incognita, whereas Mississippi Silver showed moderate resistance and the other cultivars were susceptible. As the cultivars exhibit resistance to M. arenaria and M. incognita, such cultivars resistant to root-knot nematodes should be considered during the cultivation of cowpea as a green manure crop.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.28 no.6
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• pp.250-255
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• 2018

The CoCrMo as-built alloys prepared by 3D-printing process are studied on tensile strength, wear resistance, crystal structure and microstructure after complex heat-treatment including HIP. In this study, HIP treatment for removing micropores, ambient heat-treatment for formation of metal carbides, and solution heat-treatment for homogenization of the created metal carbides were tried and characterized for applying to artificial joint. The complex heat-treatment effects of the CoCrMo as-built alloys prepared by 3D-printing process were owing to the densification during HIP, formation of metal carbides and homogenization of the created metal carbides. The effects of the complex heat-treatment were confirmed by XRD, FE-SEM and EDS.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.10a
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• pp.6-6
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• 2019

대마는 인류가 이용해 온 가장 오래된 약제 중 하나로 그 원산지는 중앙아시아와 남아시아이다. 식물분류학적으로 대마속 일년생 식물로서 Cannabis sativa, Cannabis indica, Cannabis ruderalis 3종이 있으며, 우리나라에서 재배되고 있는 종은 Cannabis sativa이다. 대마 재배의 역사는 인류의 시작과 그 궤를 같이하며, 동 서양을 막론하고 고대 문명에서 대마에 대한 기록을 쉽게 찾아볼 수 있다. 기록에 의하면 병의 치료나 심리적 치유 및 신에게 제사를 올릴 때 제사장이 사용한 것으로 알려져 있다. 대마의 약효에 대하여는 B.C. 2737년 중국의 신농황제시대의 기록에 관절염과 통증등 의료목적으로 사용했던 최초의 기록이 있으며 본초강목과 동의보감에 저술되어 있다. 우리나라의 대마에 관한 문헌 기록은 삼국지 '위지동이전', 삼국사기 '동성왕편'과 삼국유사에 삼베를 사용한 기록이 있는 것으로 미루어 봤을 때 대마재배의 역사는 삼국시대 이전으로 볼 수 있다. 우리 민족은 생활 속에서 대마를 즐겨 사용하였으며 삼베로 의복과 멍석, 행주 그리고 칠공예품이나 신발등을 만들어 사용하였으며, 죽음에 이르러 삼베옷을 수의로 사용하였다. 대마의 용도는 뿌리, 줄기, 잎, 꽃대 그리고 씨앗까지 다양하게 이용된다. 전통적으로 줄기의 껍질을 이용한 섬유제품이 있으며 실, 의복 및 밧줄등이 있다. 대마 줄기의 속대는 종이, 건축자재, 연료로 사용된다. 씨앗의 경우 식품과 조류의 먹이, 생약으로 이용되고 씨앗의 기름은 연료, 화장품, 맛사지 오일등으로 사용되고 있다. 환각성분이 있어 마리화나 원료로 사용되는 꽃대와 잎은 의약품의 원료로 주목받고 있다. 대마에 관한 최초의 논문은 1843년에 Cannabis indica의 약효에 관한 것으로 보고되었다. 1850년부터 1937년까지 미국의 약전은 대마를 100가지 이상의 질병에 효과가 있는 주요 의약품으로 기재하고 있다. 세계적으로 여러 가지 이유로 대마를 의료 응용과 연구 및 사용을 제한하여 대마에 관한 연구가 침체되었다. 대마의 의학연구는 대마의 약효성분인 칸나비노이드의 발견과 그 구조 및 약효에 관한 연구가 시작되면서 1960년대부터 증가하였으며 2000년 이후에는 칸나비노이드 및 칸나비디올의 다양한 의학적 효과가 밝혀지면서 급격히 증가하고 있다. 대마에 포함된 성분의 의학적 효과가 입증되면서 대마 사용을 합법화한 국가가 증가하면서 대마 산업이 급부상하고 있으며, 의료용뿐만 아니라 기호용, 식품용, 그리고 주류 및 음료시장까지 확대되고 있다. 우리나라도 2019년 3월 질병 치료 목적 대마성분 의약품을 제한적으로 허용하는 마약류 관리에 관한 법률 일부 개정안이 시행되면서 의료용 대마에 관한 연구와 산업화에 관심이 증가하는 추세이다.

• Journal of Korea Foundry Society
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• v.41 no.1
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• pp.3-10
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• 2021

In the compound casting between the aluminum alloy and the cast iron, the iron component may be dissolved from the cast iron during the process and mixed into the aluminum melt, thereby forming various iron-containing intermetallic compounds and significantly deteriorating the tensile properties of the aluminum alloy. On the other hand, unlike Fe, which is added as an impurity, Cu is added to improve the mechanical properties of the aluminum alloy. In this study, the change in microstructure and tensile properties of aluminum alloys due to the addition of Fe and Cu was investigated. A large amount of iron-containing compounds such as coarse Al₅FeSi phases were formed when the iron content was 1% or more, and the tensile properties were significantly reduced. In the case of the aluminum alloy to which Cu was added, an Al₂Cu phase was additionally formed and the tensile strength was clearly improved.

• Korean Journal of Materials Research
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• v.33 no.1
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• pp.8-14
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• 2023

In order to broaden the range of application of light weight aluminum alloys, it is necessary to enhance the mechanical properties of the alloys and combine them with other materials, such as cast iron. In this study, the effects of adding small amounts of Cu and Zr to the Al-Si-Mg based alloy on tensile properties and corrosion characteristics were investigated, and the effect of the addition on the interfacial compounds layer with the cast iron was also analyzed. Although the tensile strength of the Al-Si-Mg alloy was not significantly affected by the additions of Cu and Zr, the corrosion resistance in 3.5 %NaCl solution was found to be somewhat lowered in this research. The influence of Cu and Zr addition on the type and thickness of the interfacial compounds layer formed during compound casting with cast iron was not significant, and the main interfacial compounds were identified to be Al₅FeSi and Al₈Fe₂Si phases, as in the case of the Al-Si-Mg alloys.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.102-102
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• 2020

가시오가피(Acanthopanax senticosus)는 오갈피나무과(두릅나무과, Araliaceae)에 속한 낙엽관목인 가시오갈피나무 Acanthopanax senticosus Seem. 또는 기타 동속 식물의 뿌리 및 줄기 껍질이다. Acanthopanax 속 식물의 잎에 대한 약리 연구로는 위장보호작용, 항산화작용, 소염진통작용, 항암작용, 항균작용, 심근경색 개선 작용, 혈당강하작용 등에 대한 탁월한 효과가 알려져 있다. 그 중 가시오가피는 모든 오갈피 나무를 통틀어 약효가 가장 높고 보약의 역할을 한다. 인삼의 가공 과정을 적용하여 가시오가피를 증숙하면 수배에서 수십배까지 생이용성과 생리활성이 증진되나, 이렇게 제조하기 위해서는 증숙 및 냉각하는 공정을 반복적으로 가하고 효소 처리하는 증 가공 공정으로 의해 가격이 증가하게 된다. 콩단백은 콩기름이나 두부를 제조하고 남은 부산물로 영양학적으로 쇠고기 단백질과 비견할 만큼 우수한 영양학적 가치를 가지지만, 이용되는 양은 현저히 적어 이에 따른 활용도가 요구되고 있다. 압착대두 단백은 압착방식으로 기름을 짜고 남은 부산물을 파우더 형태로 가공하여 6% 가량의 지방질과 Glutamic acid, Arginine, Aspartic acid, Alanine 등 여러 가지 필수 아미노산을 제공한다. 이에, 본 연구에서는 압착대두단백과 두부건조분말을 가시오가피 소재의 기능증진 소재로 활용하고자 한다. 건조 가시오가피와 콩단백 분말의 비율을 1:0, 1:1, 1:10, 10:1로 하여, 고온고압 혼합 가공한 효과를 측정하였다. 가시오가피 단독 가공한 것에 비하여, 가시오가피-콩단백 가공물에서 가시오가피 단독 열가공에 비해, 가시오가피의 항산화도가 약 2-4배 증가하였고, 가시오가피 사포닌의 생이용성이 현격하게 증가함을 확인하였다. 본 연구는 콩가공 부산물의 고부가가치 산업화에 기여할 뿐만 아니라, 가시오가피 산업 활성에도 기여할 수 있을 것으로 기대된다.

• Journal of Life Science
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• v.30 no.3
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• pp.298-303
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• 2020

This study aimed to investigate possible applications of Rodgersia podophylla in the food and cosmetic industry. Ethanol extracts of leaves (RP-L), branches (RP-B), and root (RP-R) were prepared, and their antimicrobial, antioxidant, and anti-diabetic activities were evaluated. The polyphenol content in the RP-R, RP-L, and RP-B extracts was 79.6, 30.4, and 16.9 mg/g, respectively. An antimicrobial activity assay showed that the RP-L and RP-R extracts exhibited strong growth inhibition of pathogenic and food spoilage Gram-positive bacteria. Furthermore, the RP-R extract inhibited the growth of the Gramnegative E. coli and P. vulgaris bacteria. All extracts showed strong scavenging activity for DPPH, ABTS, nitrite, and reducing power determined by A 700 nm. In particular, the RC₅₀s of the RP-R extract for the DPPH anion and ABTS cation were 23.0-29.7 and 15.0-18.2 ㎍/ml, respectively, which are comparable to those of vitamin C (9.8 and 8.0 ㎍/ml, respectively). An activity assay of α-glucosidase and β-amylase suggested a high potential for the RP-R extract as an anti-diabetic agent. Its inhibition levels of α-glucosidase and β-amylase at 0.5 mg/ml were 6.9 and 48.5%, respectively. This is the first report of the antimicrobial and anti-diabetic activities of R. podophylla. Our results suggest that RP-L and RP-R extracts could be developed as novel cosmeceutical and functional food resources.

• Industry Promotion Research
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• v.5 no.3
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• pp.145-155
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• 2020

Co-operatives are a deep-rooted organization that was first organized in Britain in the 19th century and spread to Europe and North America in the early 20th century and to the rest of the world from the mid-20th century. Cooperative in Italy are fraternal (friendly societies) separated from religion, and in the early days of socialism and the late 19th century Catholic Italy, but independent of activity. And the Church's social participation, as well as multiple personalities. Therefore, the purpose of this study is to study the laws and institutions of Italian cooperatives. And let's look at how the laws and systems of Italian co-operatives support society and the national economy. Specifically, firstly, based on prior research, the concept of co-operatives and the cooperative movement and social values are considered. Second, review the development process and characteristics of Italian co-operatives and the legal system. Third, I would like to analyze the case of Italian co-operatives. Fourth, suggest implications according to the results of the study. The results of the study suggested the following. First, the attitude such as attachment and sincerity of representatives and staff of village enterprises is very important. Second, all members of the organization should participate in decision making with empathy and attachment to the vision of the village enterprise. Third, it should be highly likely that village enterprises, which can draw capital from outside according to the needs of the organization, will generate higher economic results. Fourth, it is important to establish a model of mind enterprise by presenting factors and success factors in establishing a village enterprise based on cases and theories. In conclusion, Co-operatives should contribute to social contribution rather than economic profit-seeking.

• Archives of design research
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• v.16 no.3
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• pp.309-318
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• 2003

A work of Art is not supposed to be isolated from the world, but it should be influenced by its cultural background and situations of the times. Therefore, Art itself reflects its era. In other words, it is created being based on the thought of its artist and simultaneously interacting with external conditions or circumstances of the era, so it would also affect the cultural code of its society. This is why modern art made by the individual living in this complicated and diversified society is quite avant-garde. Various demands from its society and diversified senses have been influencing diversification of works of Art. Now we can say that a mode of art is also dose to current stream of the times. A lot of artists have been trying to get out of traditional way of presentation techniques and classification of genres. In that point, the emergence of Multimedia Alt is inevitable in this digital era. The terms of Internet or multimedia are now familiar with everybody in the world, and a lot of works like Technology Art, Information Art, Computer Art, Digital Art, New Media Art, and so on have been coming into the world by using multimedia. Unlike other works of Art, these works from multimedia are practically used by being combined with technologies. Hereupon, in this paper I would like to find out a concept of Multimedia Art, its social function, and the future prospect of this brand-new form of art.