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Changes in Fructosazines and Major Volatile Components of Burley Leaf Tobacco Extracts by Heat Treatment (버어리잎담배 추출물의 열처리에 의한 화학성분 변화)

  • 이재곤;곽재진;장희진;김옥찬
    • Journal of the Korean Society of Tobacco Science
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    • v.19 no.2
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    • pp.151-158
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    • 1997
  • Burley leaf tobacco extracts has been heated at loot for 2 hours and changes in non-volatile fructosazines and volatile components were investigated. Major changes for the heat treatment with corn syrup of burley leaf tobacco extracts were as follows, increases in the contents of 2,5-deoxyfructosazine and 2,5-fructosazine that is produce for the heating reaction of sugar and ammonia, production of pyraEine compounds, such as 2,6-dimethyl pyrazine,2,4-dimethyl pyrazine, ethrnyl pyrazine, methylethyl pyraxine, trimethyl pyrazine, 2-ethenyl-5-methyl pyrazine, 2-acetyl parazine and 2-acetyl-3-methyl pyrazine, increases in the content of furfuryl alcohol derived from sugar degrad ation, production of 2,5-dimethyl-4-hydroxy-3(2H)-furanone and 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one derived from thermal degradation of Amadori compounds.

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The Comparison of Performance Hierarchical Routing Protocols in Wide Area Sensor Field

  • Park, SeaYoung;Jung, KyeDong;Lee, Jong-Yong
    • International journal of advanced smart convergence
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    • v.5 no.1
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    • pp.8-15
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    • 2016
  • Studies have been made for the wireless sensor network protocols by a number of researchers to date. In particular, the studies as to the hierarchical protocol LEACH algorithm was concentrated. Various studies have been derived for the performance of the protocol is based on the LEACH protocol have been made. Improved algorithms have been proposed continuously. On the other hand, The performance comparison and evaluation of the improved algorithm is insufficient. Therefore, we compared the performance for the ML-LEACH (Multi Hop-Layered) and DL-LEACH (Dual Hop-Layered) been derived mainly LEACH. scalability, energy consumption, CH elected, network lifetime were selected as a Performance evaluation items.

An Experimental Study on the Mechanical Properties of Fiber Reinforced Cement Composites Utilizing by-Products(II) (산업부산물을 활용한 섬유보강 시멘트 복합체의 역학적 특성에 관한 실험적 연구(II))

  • 박승범;윤의식;조청휘
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.10a
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    • pp.144-149
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    • 1993
  • The results of an experimental study on the manufacture and the mechanical properties of carbon fiber reinforced silica fume.cement composites and light weight fly ash.cement composites are presented in this paper. The CF reinforced silica fume.cement composites using silica fume early strength cement were prepared with Pan-derived or Pitch-derived CF, and Lt. Wt, fly ash.cement composites using fly ash, early strength cement, perlite and a small amount of foaming agent. As the test results show, the flexural strength, toughness and ductility of CF reinforced silica fume .cement composites were remarkably increased by fiber contents. Also, the manufacturing process technology of Lt. Wt. fly ash.cement composites was developed and its optimum mix proportions were proposed. And the compressive and flexural strength of the fly ash.cement composites by hot water cured were improved even more than by moist cured, but are decreased by increasing fly ash replaced ratio for cement.

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Development of Flow Stress equation of High strength steel for automobile using Neural Network and Precision Roll Force Model (신경망 함수를 이용한 자동차강의 변형저항 개발 및 압연하중 예측)

  • Kwak W. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.08a
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    • pp.145-152
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    • 2004
  • The flow stress value was calculated by comparing predicted and measured roll force. Using basic on-line roll force model and logged mill data the flow stress equation of high strength steel for automobile was derived. The flow stress equation consists of the flow stress equation of carbon steel and flow stress factor calculated by neural network with input parameters not only carbon contents, strip temperature, strain, and strain rate, but also compositions such as Mn, p, Ti, Nb, and Mo. Using the flow stress equation and basic roll force model, precision roll force model of high strength steel for automobile was derived. Using test set of logged mill data the flow stress equation was verified.

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The Effect of the MSW-RDF Power Generation and Tipping Fee Sharing in RDF Project (RDF발전효과와 사업비 분담방안)

  • Choe, Gap-Seok;Choe, Yeon-Seok;Kim, Seok-Jun;Gwon, Yeong-Bae
    • 연구논문집
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    • s.32
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    • pp.5-13
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    • 2002
  • This paper deals with the result of an analysis on the effect of the power generation by municipal solid waste(MSW)-refuse derived fuel(RDF) and the introduction of tipping fee sharing between RDF manufacturing and power generation project. As a model case for the MSW generated at small and medium cities in our country, an analysis of the RDF power generation and Tipping fee sharing shows that 1) MSW amount of 7,800* $10^3 $t/y could produce 1,950*$10^3$t/y of RDF 2) Electric power generated by MSW-RDF could supply 290,000 households/year and 98,548 C-t/y of $CO_2$ could be reduced. 3) Tipping Fee should be shared by the considering of the contents of project of both side between RDF Production and power generation.

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The Needs Analysis of Software Safety Education Program for Common Competency Area

  • Kang, Ji-Woon;Do, Sung-Ryong
    • Journal of Information Processing Systems
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    • v.17 no.5
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    • pp.960-971
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    • 2021
  • As the era of the 4th Industrial Revolution enters, the importance of software safety is increasing, but related systematic educational curriculum and trained professional engineers are insufficient. The purpose of this research is to propose the high priority elements for the software safety education program through needs analysis. For this purpose, 74 candidate elements of software safety education program were derived through contents analysis of literature and nominal group technique (NGT) process with five software safety professionals from various industries in South Korea. Targeting potential education participants including industrial workers and students, an on-line survey was conducted to measure the current and required level of each element. Using descriptive statistics, t-test, Borich needs assessment and Locus for focus model, 16 high priority elements were derived for software safety education program. Based on the results, suggestions were made to develop a more effective education program for software safety education.

What Quality Factors Affect to the e-Learning Performance (e-러닝 성과에 영향을 미치는 품질요인에 관한 연구)

  • Kim, Sung-Gyun;Sung, Hang-Nam;Jeong, Dae-Yul
    • The Journal of Information Systems
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    • v.16 no.1
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    • pp.201-230
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    • 2007
  • Recently, the growth of e-Learning systems and its related information technology has presented a unique challenge for both schools and industry. It would make an extremely phenomenal paradigm shift in the educational method and practice. Methods of assessing the quality of e-teaming services and contents are critical issue in both practice and research. Moreover, many researchers are interested in what qualify factors more affect to the Performance of e-Learning service. Nevertheless, service quality is a construct that is difficult to define and measure. e-Learning services are composed of many factors, and they are more complicated than the traditional education services because they we performed on the distance basis and the many platforms of IT infrastructure. The purposes of our research are to classify the e-Learning service dimension and identify their factors, to develop the measurement of the factors, and finally to test empirically their relationship between the service factors and e-Learning service performance. For the development of the service factors we considered SERVQUAL model and SERVPERF model which were developed in the service marketing area. The SERVQUAL model was more fitted to the e-Learning services than the latter. From that we derived several factors that fit to our research domain, ie, tangibles, access, reliability, credibility, security, responsiveness, assurance, empathy. We combined three factors of them(reliability, credibility, security) into a factor, system stability for the semantic simplicity, and divided responsiveness factor into system operator responsiveness and teacher responsiveness as the entity based dimension classification. In the e-Learning services research, Most researcher are mentioned the quality factors of contents, so we added to two contents quality factors, ie, contents production method and richness of contents itself. We examined the relationship between the service quality factors and e-Learning performance(student satisfaction and service reuse intention). As result three quality factors(contents production method, teacher responsiveness, empathy) significantly affected student satisfaction. To the other performance variable, ie, service reuse intention, the teacher related quality factors(such as teacher responsiveness, assurance, empathy) affected only. In conclusion, even in the on-line distance teaming, the teacher's role md earnestness is as important as ever.

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A Study on Promotion plans of the Cultural Contents Industry from a Perspective of Simulacre - Focused on Characters - (시뮬라크르 관점에서 문화컨텐츠산업의 활성화 방안에 관한 연구 -캐릭터를 중심으로-)

  • Jun, Jeon-Sook;Son, Young-Bum
    • Archives of design research
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    • v.19 no.5 s.67
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    • pp.269-280
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    • 2006
  • In the 21st century, a nation's industrial success will depend on her cultural industry. Thus, Korea has been investing much in the cultural contents industry, expecting high. A nation's potential in the industrial contents industry will be determined by 1) IT infrastructure, 2) digital convergence, 3) rich cultural heritage and 4) government's effective policies. Nevertheless, our cultural contents industry is not as much homogeneous as that of the United States or Japan, but only some parts of it have grown much. So, our cultural contents industry is not very stable, which means that it would grow in a short term but not in a long term. One of the ways to promote the cultural contents industry effectively may be derived from Jean Baudrilliard's theory of simulacra. The aim of this study is to review the ultimate simulacra required of our cultural contents industry, focusing on Disneyland which Jean Baudrilliard emphasizes as the most perfect simulacra.

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Contents Recommendation Scheme Considering User Activity in Social Network Environments (소셜 네트워크 환경에서 사용자 행위를 고려한 콘텐츠 추천 기법)

  • Ko, Geonsik;Kim, Byounghoon;Kim, Daeyun;Choi, Minwoong;Lim, Jongtae;Bok, Kyoungsoo;Yoo, Jaesoo
    • The Journal of the Korea Contents Association
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    • v.17 no.2
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    • pp.404-414
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    • 2017
  • With the development of smartphones and online social networks, users produce a lot of contents and share them with each other. Therefore, users spend time by viewing or receiving the contents they do not want. In order to solve such problems, schemes for recommending useful contents have been actively studied. In this paper, we propose a contents recommendation scheme using collaborative filtering for users on online social networks. The proposed scheme consider a user trust in order to remove user data that lower the accuracy of recommendation. The user trust is derived by analyzing the user activity of online social network. For evaluating the user trust from various points of view, we collect user activities that have not been used in conventional techniques. It is shown through performance evaluation that the proposed scheme outperforms the existing scheme.

Digital Application and Suggestions of Cultural Prototypes in Traditional Costumes (전통복식 문화원형 콘텐츠의 디지털 활용 현황과 제언)

  • Cho, Hyo-Sook;Lim, Hyun-Joo
    • Journal of the Korean Society of Costume
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    • v.60 no.6
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    • pp.89-100
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    • 2010
  • This study is intended to analyze current status of costume in the cultural industry and explore feasibility of integrating costume as important cultural contents in the digital era. Among the websites for contents as the cultural archetypes, some have strong foundations while others don't. First, as for various archetypal characters restored based on the Korean history, most of their clothes focus on shapes and colors but lack details. They should be produced in 3D to provide back views or textile patterns to users. To ease understanding of the history of costume, user-friendly services such as launch of a pop-up window when users click on specific contents in question should be available for detailed information. At least there should be a link to other related sites where users can conveniently find more details. Second, some sites have too much data under one subject, increasing complexity and undermining orderliness. As a result, it takes long time to identify the site map. In this case, it is required to rearrange the contents with Quick View by subject and related links for in-depth study. Third, each subject is important to develop the archetypes for a variety of purposes. Creation of design derived from them or their commercialization can be an example but these activities should not restrict imagination of users or degrade the value of the archetypes. Last, it is needed to adopt validation system to detect the needs for a regular update (renewal) and to fix errors. We found many servers whose operation is not stable in general. When these technical issues are addressed for stable operation, users will rely on the sites to utilize them for their purpose of developing the cultural archetypes. In conclusion, advancement of www.culturecontent.com is essential. Based on efficient management and operation of the system, the quality of contents would be increased and multi-faceted advertising campaigns focusing on needs should be launched, to promote application of the contents. This is the recommendation for the future of the cultural archetype industry in Korea.