• KSBB Journal
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• v.22 no.5
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• pp.271-277
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• 2007

Natural pigments have many applications like colouring agent, pigments, food additives, and antiseptics. At present, instead of synthetic pigments that have contributed to the development of industry, many kinds of natural pigments have been developed. The constituents of gardenia fruits, Gardenia jasminoides ELLIS, are traditionally known as herb medicine and natural dyes/pigments due to the customer is needs. The fruits produce yellow carotenoid pigments and iridoid compounds. The two main components in the yellow pigments are called crocin and crocetin. The extraction mode of yellow pigment from Gardenia is depended upon the extraction time, temperature, and volume of solvent. Red pigments or blue pigments formed from geniposide and amino acids have been reported a lot. Geniposide, the principal iridoid glucoside contained in gardenia fruit, was hydrolyzed to genipinic acid or genipin as a precursor for the pigment by enzymatic or chemical reaction. These red or blue pigments prepared with materials hydrolyzed of geniposide and amino acid and had properties governed by the electrostatic character of the amino acid. The pigments showed good stability to heat and pH but were gradually bleached by light while the other natural pigments are unstable in light, heat, acid, and base solution. The safety of the pigments was considered to be of little virulences in comparison to synthetic pigments.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.35 no.2
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• pp.501-514
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• 2015

Earthwork is a basic operation for all forms of civil works and affects construction time, cost and productivity. It is a mechanized operation that needs various construction equipment as a group and uses a lot of fuel for construction equipment. But, the problem is that earthwork operation is usually performed by equipment operator's heuristic and intuition, which can cause low productivity, high fuel consumption, and high carbon dioxide emission. As one of solutions for this problem, the fleet management system for construction equipment is suggested for effective earthwork planning, optimal equipment allocation, efficient machine operation, fast information exchange, and so forth. The purpose of this research is to suggest core methods for developing the equipment fleet management system. The methods include 3D solid parametric model generation, soil distribution using Cctree data structure, equipment fleet construction and equipment fleet operation. A simulation test is performed to verify the effectiveness of the equipment fleet management system in terms of equipment operating ratio, fuel usage, and $CO_2$ emission.

• Journal of the Korean Society for information Management
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• v.31 no.2
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• pp.173-188
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• 2014

This research aims to analyze empirically the effects of learners' knowledge sourcing behavior on the knowledge utilization outcomes in a social learning community. This kind of virtual community is of service to users who not only produce but also share a variety of valuable knowledge which is created based on relationships and interactions among learners. In order to conduct the study, a group of learners was made of 55 undergraduate students who were majoring in social science. The data was collected by online survey at the end of the term and multiple regression methods have been used for empirical analysis. The study shows that dyadic knowledge sourcing and published knowledge sourcing both have significant effects on knowledge reuse and knowledge adaptation. In addition, knowledge adaptation and knowledge innovation were affected by group knowledge sourcing. The research results help to select appropriate knowledge sourcing behavior depending on one's purpose of knowledge use.

• Applied Chemistry for Engineering
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• v.31 no.5
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• pp.467-474
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• 2020

Polymer solar cells have attracted extensive attention over the past decade due to their benefits, such as good solution-process-ability, light weight, low-cost, mechanically flexibility, and high efficiency. Conjugated (CPE) and non-conjugated (NPE) polyelectrolyte materials have been employed to avoid the typical weaknesses associated with conventional metal oxide interlayers. However, the application of CPEs is more complicated than that of NPEs because the synthesis procedures are complicated. NPEs containing charged ion groups can provide numerous benefits for renewable energy applications. Especially when implemented in polymer solar cells.

• Journal of Life Science
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• v.20 no.1
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• pp.66-70
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• 2010

The genetic relationships of 14 Dolsan leaf mustard (Brassica juncea) lines were analysed using random amplified polymorphic DNA (RAPD) analysis. Thirty nine random primers were tested and seven primers which showed polymorphism were selected. The amplified fragments ranged from 0.2 to 3.5 kb in size. The number of bands amplified in each primer showed the variations ranging from 2 to 27, with an average of 8.7. Based on the UPGMA cluster analysis, 14 lines were separated into three groups. The results showed that RAPD analysis was useful in the genetic diversity and in the cross combination of the $F_1$ hybrid of leaf mustard.

• 한국IT서비스학회:학술대회논문집
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• 2003.11a
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• pp.194-201
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• 2003

본 연구는 최근 국내 SI 기업의 활발한 해외시장 진출과 관련하여 일반적인 IT 서비스의 성질을 도출해 고객의 구매결정을 방해하는 요인을 찾아내고 이를 해결하기에 적합한 시장진출유형을 제시하는 것을 목적으로 한다. 또한 거래비용 관점에서 SI 기업에게 가장 효율적인 진출유형이 무엇인지를 도출하는 것이다. IT 서비스는 구매계약이 체결된 이후에 생산이 시작되므로 일단 사용해 본 후에야 품질평가가 가능한 경험적 성질을 갖는다. 따라서 해당 SI 기업과의 사업경험이 없는 고객은 구매 전에 IT 서비스의 품질을 평가할 수 없기 때문에 구매에 대한 높은 불확실성을 인식하게 되고 이것은 구매결정을 방해하는 요인으로 작용한다. 이러한 문제는 SI 기업이 새로이 해외시장에 진출할 때 현지에서 명성과 신뢰를 쌓고 있는 기업과의 합작투자를 통해 해결될 수 있다. 왜냐하면 이럴 경우 IT 서비스와 관련해서는 아직 사업경험이 없다고 할지라도 현지 기업의 명성이나 신뢰, 또는 기존의 돈독한 사업관계를 통해 SI 기업이 자신을 속이거나 배반하지 않을 것이라는 기본적인 믿음을 통해 고객의 불확실성을 감소시킬 수 있기 때문이다. 또한 시장거래비용과 관리적 거래비용 측면에서 순수 자회사 설립보다는 현지 시장 및 고객환경에 밝은 현지 기업과의 합작회사 설립을 통해 진출하는 것이 보다 효율적이다. 이와는 달리 최근 국내 대형 SI 기업의 해외진출 현황을 살펴보면 자회사 설립을 통한 진출을 선호하는 것으로 나타났는데 이것은 이들이 속한 그룹사들이 많은 해외시장 경험을 통해 해당 시장환경에 익숙하기 때문에 현지 기업의 도움 없이도 시장개척이나 고객확보가 가능하다고 판단했기 때문이라고 해석된다. 본 연구결과는 특히 해외시장 경험이 아직 부족한 국내 SI 기업들이 해외시장에 진출할 때 유용한 자료로 활용될 수 있다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.34 no.6
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• pp.449-453
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• 2021

Interest and investment in renewable energy have increased worldwide, highlighting the need for renewable energy. Solar energy was the most promising energy of all renewable energy sources, and it has the highest investment value. Because photovoltaics require a certain amount of area for installation, high density and high output performance are required. Shingled module is a promising technology in that they are featured by higher density and higher output compared to the conventional modules. Shingled technology uses a laser scribing to divide solar cells that are to be bonded with electrically conductive adhesive (ECA) to produce and connect strings, which has a higher output in the same area than the conventional modules. In the process of producing solar modules, metal ribbons are used to interconnect cells, but they are also needed for string connections in shingled solar cells. Accordingly, in this study, we researched the interconnection that best suits the connector that joins the string to the string. The module outputs produced under the conditions of the string interconnection were compared and analyzed.

• Journal of the Korea Convergence Society
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• v.10 no.3
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• pp.395-400
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• 2019

The Web environment of the frontend domain is increasingly competitive to preempt the new standard of presentation layer. N-Screen, a service that enables users to seamlessly use one content in various devices in Korea, is competing for market preemption by recognizing it as a core service of the future. In the cloud computing, N-screen is a typical service type. However, most of the frontend research required for groupware in enterprise environments has been limited to responsive web design for the web and native apps for mobile. Gradually, the need for MVC design patterns is increasingly widening in enterprise environments to overcome the cultural differences of companies and to support one source multi-use strategy supporting multiple devices and development productivity. Therefore, in this study, we will analyze and design JPetStore with hybrid application design based on Spring MVC, e-government standard framework environment of next generation web standard, and provide reference model of frontend hybrid apps design in future enterprise environment.

• The Journal of the Korea Contents Association
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• v.19 no.9
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• pp.221-232
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• 2019

The uniqueness of the K-Pop 'idol' culture, which is a key area of its success, can be found not only through the acceptance of diverse cultures and the strengthening of the performance capacity, but also by the effective utilization of new technological environment. As a result, the Korean idol system, which is distinguished from the Japanese idol system, is established. And these systems are evolving with new technological environments. This paper examines the process of evolution of the Korean idol system that adapts to the technical environment through the case of the idol girl group 'IZ*ONE'. 'IZ*ONE' not only achieved rapid success by actively utilizing SNS and new media and producing interactive narratives, but also establishing stable expansion and homogeneity of fandom through interactive rituals. By comparing the evolution and achievement of such a system with the Japanese idol system, we will be able to present the factors of K-Pop success more clearly.

• Journal of the Korean institute of surface engineering
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• v.56 no.2
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• pp.152-159
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• 2023

The night visibility of pavement is being considered as a global issue in the field of traffic safety. Although the spreading glass beads on the lane paints has been mainly used to secure night-visibility by utilizing the effect of retroreflection, obvious shortcoming of this method is that retroflection does not occur in the range where the headlights do not reach the glass beads. The use of functional paints including phosphorescent constituents could be a solution for overcoming fore-mentioned problem. SrAl₂O₄ based chemicals have not only good phosphorescent property, but also are chemically stable compared to existing ZnS based materials. However, this chemicals also need the improvement due to slightly reduced luminous effect in time. Herein, we developed novel paints showing enhanced phosphorescent properties by putting rare earth elements such as Eu, Dy and Y into SrAl₂O₄. These prepared phosphorescent pigments have displayed improved properties in terms of durability and long afterglow. For instance, the property of afterglow has been persisted after 5 hours with luminace of 20.6 mcd/m².