• 제목/요약/키워드: Design methodology

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편집심사업무 관점에서 학술지 윤리강화를 위한 표절 검증사례 (Cases of Ethical Violation in Research Publications: Through Editorial Decision Making Process)

  • 황희중;이정완;김동호;신동진;김병구;김태중;이용기;김완기;윤명길
    • 유통과학연구
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    • 제15권5호
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    • pp.49-52
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    • 2017
  • Purpose - To improve and strengthen existing publication and research ethics, KODISA has identified and presented various cases which have violated publication and research ethics and principles in recent years. The editorial office of KODISA has been providing and continues to provide advice and feedback on publication ethics to researchers during peer review and editorial decision making process. Providing advice and feedback on publication ethics will ensure researchers to have an opportunity to correct their mistakes or make appropriate decisions and avoid any violations in research ethics. The purpose of this paper is to identify different cases of ethical violation in research and inform and educate researchers to avoid any violations in publication and research ethics. Furthermore, this article will demonstrate how KODISA journals identify and penalize ethical violations and strengthens its publication ethics and practices. Research design, data and methodology - This paper examines different types of ethical violation in publication and research ethics. The paper identifies and analyzes all ethical violations in research and combines them into five general categories. Those five general types of ethical violations are thoroughly examined and discussed. Results - Ethical violations of research occur in various forms at regular intervals; in other words, unethical researchers tend to commit different types of ethical violations repeatedly at same time. The five categories of ethical violation in research are as follows: (1) Arbitrary changes or additions in author(s) happen frequently in thesis/dissertation related publications. (2) Self plagiarism, submitting same work or mixture of previous works with or without using proper citations, also occurs frequently, but the most common type of plagiarism is changing the statistical results and using them to present as the results of the empirical analysis; (3) Translation plagiarism, another ethical violation in publication, is difficult to detect but occurs frequently; (4) Fabrication of data or statistical analysis also occurs frequently. KODISA requires authors to submit the results of the empirical analysis of the paper (the output of the statistical program) to prevent this type of ethical violation; (5) Mashup or aggregator plagiarism, submitting a mix of several different works with or without proper citations without alterations, is very difficult to detect, and KODISA journals consider this type of plagiarism as the worst ethical violation. Conclusions - There are some individual cases of ethical violation in research and publication that could not be included in the five categories presented throughout the paper. KODISA and its editorial office should continue to develop, revise, and strengthen their publication ethics, to learn and share different ways to detect any ethical violations in research and publication, to train and educate its editorial members and researchers, and to analyze and share different cases of ethical violations with the scholarly community.

KODISA 학술지 성장전략: 2016 개관 및 미래 성장개요 (Future Development Strategies for KODISA Journals: Overview of 2016 and Strategic Plans for the Future)

  • 황희중;이정완;윤명길;김동호;이종호;신동진;김병구;김태중;이용기;김완기
    • 유통과학연구
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    • 제15권5호
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    • pp.75-83
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    • 2017
  • Purpose - With the rise of the fourth industrial revolution, it has converged with the existing industrial revolution to give shape to increased accessibility of knowledge and information. As a result, it has become easier for scholars to actively persue and compile research in various fields. This current study aims to focus and assess the current standing of KODISA: the Journal of Distribution Science (JDS), International Journal of Industrial Distribution & Business(IJIDB), the East Asian Journal of Business Management (EAJBM), the Journal of Asian Finance, Economics and Business (JAFEB) in a rapidly evolving era. Novel strategies for creating the future vision of KODISA 2020 will also be examined. Research design, data, and methodology - The current research will analyze published journals of KODISA in order to offer a vision for the KODISA 2020 future. In part 1, this paper will observe the current address of the KODISA journal and its overview of past achievements. Next, part 2 will discuss the activities that will be needed for journals of KODISA, JDS, IJIDB, EAJBM, JAFEB to branch out internationally and significant journals will be statistically analyzed in part 3. The last part 4 will offer strategies for the continued growth of KODISA and visions for KODISA 2020. Results - Among the KODISA publications, IJIDB was second, JDS was 23rd (in economic publications of 54 journals), and EAJBM was 22nd (out of 79 publications in management field journals). This shows the high quality of the KODISA publication journals. According to 2016 publication analysis, JDS, IJIDB, etc. each had 157 publications, 15 publications, 16 publications, and 28 publications. In the case of JDS, it showed an increase of 14% compared to last year. Additionally, JAFEB showed a significant increase of 68%. This shows that compared to other journals, it had a higher rate of paper submission. IJIDB and EAJBM did not show any significant increases. In JDS, it showed many studies related to the distribution, management of distribution, and consumer behavior. In order to increase the status of the KODISA journal to a SCI status, many more international conferences will open to increase its international recognition levels. Second, the systematic functions of the journal will be developed further to increase its stability. Third, future graduate schools will open to foster future potential leaders in this field and build a platform for innovators and leaders. Conclusions - In KODISA, JDS was first published in 1999, and has been registered in SCOPUS February 2017. Other sister publications within the KODISA are preparing for SCOPUS registration as well. KODISA journals will prepare to be an innovative journal for 2020 and the future beyond.

노인의 가족결속력이 자기조절능력에 미치는 영향 연구 (A Study of Family Cohesion on Self-Regulation Ability of the Elderly)

  • 정명희
    • 산경연구논집
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    • 제8권6호
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    • pp.51-60
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    • 2017
  • 본 연구는 노인의 가족결속력과 사회활동에 미치는 영향을 알아보고, 노인의 가족결속력과 가정 만족도, 종교 사회활동 간의 관계에서 자기 조절능력의 매개효과를 규명하는 것을 목적으로 하고 있다. 노인들이 가정을 이용하는데 가족결속력과 자기 조절능력의 영향에 대하여 분석을 하고자 한다. 본 연구의 가설검증을 통한 연구결과를 요약하면 다음과 같다. 첫째, 가정의 가족결속력의 요인이 여가 사회활동에 미치는 영향연구에서 가족결속력 하위변인인 가족 응집성, 가족 화합성, 가족 적응성이 높아지면 여가 사회활동이 높아지는 것으로 나타났다. 둘째, 가정의 가족결속력의 요인이 종교 사회활동의도에 미치는 영향연구에서 가족결속력 하위변인인 가족 응집성, 가족 화합성, 가족 적응성이 높아지면 종교 사회활동의도가 높아지는 것으로 나타났다. 셋째, 가정의 자기 조절능력이 여가 사회활동, 종교 사회활동의도에 미치는 영향연구에서 자기 조절능력이 높아지면 여가 사회활동, 종교 사회활동의도가 높아지는 것으로 나타났다. 넷째, 가정의 가족결속력 요인이 여가 사회활동에 미치는 영향연구에서 자기 조절능력의 매개효과 분석 결과, 가족결속력이 강해지면, 자기 조절능력도 좋아지고, 여가 사회활동도 높아지는 것으로 나타났다. 다섯째, 가정의 가족결속력 요인이 종교 사회활동의도에 미치는 영향연구에서 자기 조절능력의 매개효과 분석 결과, 가족결속력이 강해지면, 자기 조절능력도 좋아지고, 종교 사회활동의도가 높아지는 것으로 나타났다. 본 연구는 점차 증가하는 노인들의 특성을 이해하는데 많은 도움이 되었으며, 세부적으로 이용 중요 전체적으로 영향이 있는 것으로 나타났지만 차후에 노인의 사회활동에 필요한 요인들로서 활동가능하다. 향후에는 표본 대상을 세분화하여 연구가 필요하다고 생각한다. 특히 사회활동의 범위를 세분화한 연구를 진행하고자 한다. 지금까지의 조사를 토대로 앞으로의 본 연구에 대한 몇 가지 제언을 해보고자 한다. 첫째, 점차 고령화 사회가 되어가는 현실에서 노인 삶의 질과 생활만족도를 높이기 위해서는 자녀와의 관계에서 가족결속력이 매우 중요하다는 것이다. 자녀와의 가족결속력에 심리적 행복감에 중요한 영향을 미쳐 노인의 자기조절능력 향상에도 영향관계가 있음을 알 수 있다. 따라서 자녀와의 진실한 대화를 통한 유대를 형성하는 노력이 더욱 필요하다. 이런 의미에서 노부모와 자녀들 간의 건강한 관계를 형성하기 위한 다양한 프로그램 및 상담서비스 제공이 필요하다. 둘째, 현재까지의 우리나라의 대부분의 연구가 노인이 생각하는 생활만족, 노부모가 느끼는 자녀와의 결속에만 치우쳐 있다. 앞으로의 연구는 자료수집과 분석에 어려움이 다소 예상되나 노부모와 자녀 모두를 연구대상으로 하여, 노부모와 성인자녀의 특성을 각각 파악하고 노부모가 느끼는 자녀와의 결속과 자녀가 느끼는 노부모와의 결속에 어떤 일치와 차이점이 있는지를 연구하는 것이 필요하다. 셋째, 노인의 가족결속력을 높이기 위한 방안으로 자녀의 노부모 부담 및 돌봄의 짐을 덜어주기 위한 현실적 정책제안이 필요하다. 즉, 노인을 돌보는 자녀들에 대한 지원 정책뿐만 아니라 장기요양서비스가 필요한 노인들이 언제든 자녀와의 만남을 가질 수 있도록 시군구의 직영 요양시설의 증가가 필요하다. 또한 거주지의 주소지 소속에 대한 혜택을 전국 어디서든지 자녀들의 주소지의 요양시설에도 혜택을 받을 수 있게 국가가 책임지고 재정적, 행정적인 지원을 지속적으로 할 수 있어야 하며, 사회적 인프라를 구축해야 한다. 본 연구는 연구의 대상과 방법에 있어서 다음과 같은 제한점을 갖는다. 첫째, 본 연구의 표집대상이 서울과 경기 지역에 소재한 7개의 복지관을 이용하는 노인 경로대학에 출석하는 대상자만을 선정하였기 때문에 표본의 대표성이 떨어져 연구결과를 일반화하는 데 한계를 지닌다. 둘째, 설문조사과정에 있어서 응답자의 개인변인 등을 고려하여할 때 향후에는 표본 대상을 세분화하여 연구를 진행할 필요가 있다.

TPB 이론을 적용한 치기공학 전공 대학생들의 실습실 안전교육 효과 평가 (Effect Assessment of Safety Education in Laboratories of Department of Dental Technology Applied of Theory of Planned Behavior (TPB))

  • 박종희;이명선
    • 한국학교ㆍ지역보건교육학회지
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    • 제9권2호
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    • pp.15-31
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    • 2008
  • 본 연구는 치기공과 학생들의 안전 행동 예측을 위하여 Ajzen(1988, 1991)의 계획된 행위이론에 근거하여 개발한 프로그램이 안전 행동 의도와 행동에 영향을 미치는지 확인하기 위하여 실시된 비동등성 대조군 전 후 설계에 의한 유사 실험연구로 본 연구 결과 사고예방 교육 후 실험군이 대조군보다 TPB 독립 변수인 안전행동에 대한 태도, 주관적 규범, 지각된 행위통제, 안전행동 의도 점수가 더 높을 것이다는 유의한 차이가 나타나지 않았으나 행동과 지식은 유의미한 차이가 나타났다. 행동에 있어서 사전, 사후 조사 결과 유의한 차이가 나타난 항목은 실험군의 경우 11개이었고, 대조군은 2개로 나타났으며, 지식은 실험군의 경우 12개, 대조군은 4개로 나타났다. 따라서 안전 행동에는 태도, 규범, 지각된 행위통제보다 지식이 영향을 미치는 것으로 나타났으므로 치기공과 학생들을 위한 실습실 안전교육시 사용하는 재료나 도구에 대한 안전 수칙이나 안전행동 방법에 대한 직접적인 지식교육이 1차적으로 이루어져야 하며 더불어 태도나 규범, 행위통제에 대한 교육이 이루어져야 할 것이라고 판단된다. 따라서 안전행동 방법에 대한 지식을 강화하고 생명의 존엄성과 안전의 중요성을 인식시켜 안전행동을 하도록 교육하는 것이 필요하다.

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미강의 $\gamma$-oryzanol 및 생리활성물질의 에탄올 추출공정 최적화 (Optimization of Ethanol Extraction of $\gamma$-oryzanol and Other Functional Components from Rice Bran)

  • 조인희;최용희
    • 한국식품저장유통학회지
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    • 제17권2호
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    • pp.281-289
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    • 2010
  • 본 연구에서는 미강의 지용성 생리활성 물질인 $\gamma$-oryzanol과 그 모핵인 ferulic acid를 ethanol을 용매로 효율적으로 추출하고자 반응표면분석법을 이용하여 최적 추출 조건을 설정하였다. 중심합성계획법에 따라 추출조건의 독립변수를 시료에 대한 용매비($X_1$), 추출 온도($X_2$), 추출 시간($X_3$)으로 하고 이에 따라 영향을 받는 종속변수로 추출 수율($Y_1$), 총페놀 함량($Y_2$), 전자공여능($Y_3$), 미강의 지용성 생리활성물질인 ferulic acid 함량($Y_4$)과 $\gamma$-oryzanol 함량($Y_5$)을 설정하였다. 추출 수율은 추출조건이 시료에 대한 용매비 22.56 mL/g ($X_1$), 추출 온도 $78.19^{\circ}C$ ($X_2$), 추출 시간 522.15 min ($X_3$)일 때 최대값 42.03%를 나타내었다. 총페놀 함량의 최대값은 90.78 mg GAE/100 g이었으며, 이때의 추출 조건은 시료에 대한 용매비 21.26 mL/g, 추출온도 $94.65^{\circ}C$, 추출시간 567.97 min이었고, 전자공여능은 시료에 대한 용매비 20.20 mL/g, 추출온도 $81.89^{\circ}C$, 추출 시간 701.87 min일 때 최대값 54.72%를 나타내었다. 그리고 ferulic acid 함량의 최대값은 시료에 대한 용매비 5.22 mL/g, 추출 온도 $79.66^{\circ}C$, 추출 시간 575.24 min일 때 210.47 mg/100g이었고 $\gamma$-oryzanol 함량은 시료에 대한 용매비 5.10 mL/g, 추출온도 $81.83^{\circ}C$, 추출시간 587.39 min에서 최대값 660.39 mg/100g를 나타내었다. 실험결과 모든 종속변수들은 시간보다는 시료에 대한 용매비와 추출온도에 영향을 많이 받았다. 특히 미강의 지용성 생리활성물질인 ferulic acid와 $\gamma$-oryzanol은 온도가 약 $80^{\circ}C$보다 높아지면 추출함량이 감소하는데 이는 온도가 높아짐에 따라 추출용매의 증발과 같은 손실때문인 것으로 사료된다. 이들 특성을 모두 만족시키는 최적 추출조건은 시료에 대한 용매비 10.45 mL/g, 추출온도 $80^{\circ}C$, 추출시간 535 min으로 예측되었다. Ethanol 역시 isopropanol 과 같이 hexane의 대체용매로서 미강의 추출 용매로 적합하다고 사료된다.

구곡원림의 원류, 중국 무이구곡(武夷九曲)의 텍스트성 -국내 전승(傳承) 과정을 중심으로 - (A Study on the Textuality of China's Wuyi-Gugok, the Origin of Gugok-Wonlim -Focus on the Tradition Process to Korea -)

  • 노재현
    • 한국조경학회지
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    • 제36권6호
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    • pp.66-80
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    • 2009
  • 본 연구는 '무이도가(武夷櫂歌)'나 '무이구곡(武夷九曲)' 관련 문화현상이 어떠한 연유와 과정으로 조선시대에 수용되었으며 내재된 담론과 문화적 응집의 규칙성, 특히 국내에서 구곡문화의 반복과 모방을 통한 전승과정에서 나타난 특성은 무엇인가를 밝히기 위해 시도되었다. 문헌고찰 및 현장답사에 의한 경관 인식과 함께 드레슬러(Dressier)가 제시한 텍스트성의 7가지 기준을 근거로 '해석 및 논의 틀'을 구축하고 텍스트의 의존관계, 생산자와 수용자의 관계, 반복 및 모방 그리고 전파과정으로 나누어 '무이구곡'의 텍스트성을 해석하였다. 텍스트 파악 의도와 상황적 근거로 볼 때 주자의 무이도가 그리고 무이구곡 경영은 무이산지 등의 문헌과 그림을 통해 조선에 전파되면서 일종의 사회현상으로 국내에서도 산간 계곡의 뛰어난 지형경관에 구곡을 설정하며, 정사를 경영하는 등 문학적 원림경관적 반복과 모방사례가 헤아릴 수 없을 정도로 많이 생겨났다. 생산자의 의도 또는 용인에 관계없이 조선에 수용된 구곡문화는 수용자 계급이 지향한 도교문화적 상황과 유교의 경세제민(經世濟民)적 사대부 사고관에 편승하면서 새로운 문화로 정착하게 되었고 그 결과, 조선 구곡원림은 무이도가와 무이구곡에서 나타난 상자연(賞自然)의 미의식을 수용하면서 도교와 성리학적 사유방식과 결합되었다. 그러나 텍스트적 요인에 의한 의존 관계만을 살펴 볼 때, 국내에는 무이구곡과 같이 배를 타고 하상을 거슬러 올라갈만한 장소가 드문 관계로 하천 형태와 기능적 텍스트성으로서의 결속구조는 다소 이완된 채 도학적 사고나 풍류적 향유에 의존한 구곡문화가 텍스트성의 내적 구조를 지배한 것으로 보인다. '무이구곡'의 텍스트성을 지배하는 내적 요인은 "굽음의 미학, 물돌이", "영역성의 표현, 각자(刻字)", "의미경관의 성찰로 본 문화적 풍경", "기(奇)의 추구와 표상성" 그리고 "도교와 성리학적 토포스의 초월적 풍경"으로 해석되었다.

컴퓨터 및 스마트폰 사용이 근골격계질환으로 인한 업무능력 저하에 미치는 영향 : 근골격계 질환의 매개효과 (The Effect of using Computer & Smart-phone on Decreased Work Efficiency due to Musculoskeletal Disorders ; Mediating Effect of Perceived Musculoskeletal Disorders)

  • 박종호
    • 유통과학연구
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    • 제14권3호
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    • pp.55-62
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    • 2016
  • Purpose - Average using time of smart-phone for Korean people is 3 hours 39 minutes and most people who are using a computer at home and their workplace can be affected over force to neck and shoulder due to unstable body posture. musculoskeletal disorders which caused by unstable body posture can affect strongly to decrease work efficiency. So this research is designed to measure the effect of using computer & smart-phone on decreased work efficiency due to musculoskeletal disorders and mediating effect between decreased work efficiency and musculoskeletal disorders. Research Design, Data, and Methodology - The author has developed a questionnaire with 6 hypothesis on the basis of previous research result with 5 constructs. The questionnaires were also made by interview and E-mail. 300 copies of questionnaires were distributed and 282 questionnaire were used for the analysis as valid data responses. SPSS ver.21.0 were used and made Cronbach's α and reliability test, correlation, Baron & Kenny 3 step mediated regression analysis. Result - Cronbach's α shows 0.770~0.954 and C.R. is 0.963~0.997 which is higher than 0.7. and AVE was 0.867~0.933. So the data are all acceptable condition. Using for a long time of a computer & smart-phone has a positive effect on musculoskeletal disorders. This means, it can cause musculoskeletal disorders if people use a computer & smart-phone for a long time due to unstable body posture. And musculoskeletal disorders can effect strongly decrease work efficiency. This study also found out that a long time of using computer can cause musculoskeletal disorders rather than using smart-phone a long time. To check mediate effect of musculoskeletal disorders between using a computer & smart-phone and Decreased Work Efficiency, author used 3-step mediated regression analysis of Baron & Kenny (1986). Using a computer for a long time mediate partially and using a smart-phone for a long time mediate completely. This means that using a smart-phone a long time is not the actual reason to decrease work efficiency. But using level of smart-phone is increasing rapidly day by day. So we need to make additional research about this matter seriously. Conclusion - Nowadays, people can not live on without a computer & smart-phone even a moment. But, using a computer for a long time will affect to cause musculoskeletal disorders and it will effect strongly to decrease work efficiency. Before, we thought over that musculoskeletal disorders were diseases of elder people. But, we found out from this study that musculoskeletal disorders can be happen to any people, even children, or workers in heavy industry or engaged in brain work. So we need to be careful when we use a computer for a long time. People also need to be careful to keep correct body posture when using both a computer and smart-phone since a smart-phone became more popular and using time level became longer. Due to increased income and living standard of people, physical growth of young people is so rapid. But the physical environment of society is not suitable for them since it can not follow up the speed of growth. Suitable work table is very important to prevent musculoskeletal disorder which can affect decrease work efficiency. For a person, a society or country, increased productivity is very important since it can directly connected to the job satisfaction. Education and reeducation for the people is also important, but to teach them how to keep good condition of health will be more important since it can increase the quality of work efficiency and quality of life. Computer and Smart-phone is one the best invention of modern society, but it can cause mental and physical disease which can affect decrease work efficiency and productivity. So it is necessary to observe attentively for the situation continually.

양봉농가 표준 경영과 마케팅 진단표 개발 (The Development of Beekeeping Farm Management and Marketing Standard Diagnostic Checklist)

  • 이철휘;송전의;장현동;최칠구;김웅;최재혁;허무열;권세혁;황수연
    • 유통과학연구
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    • 제13권10호
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    • pp.115-122
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    • 2015
  • Purpose - This study was conducted to develop a beekeeping farm management standard checklist. This is essential to increase the competitive power of beekeeping farmers. Checklists in relation to crops and livestock were established by the Rural Development Administration in the 2000s. To date, 60 checklists have been created by crop and livestock experts. However, other farmers outside the 60 checklists are increasing. Therefore, extra development is required for these farmers. This study was conducted to meet farmers' requirements. The special farming dealt with in this study is beekeeping. Such checklists were not developed due to the small number of beekeeping farmers. However, these days, a number of such farmers are emerging. Research design, data, and methodology - Many related experts participated in this study. This study was conducted in four stages. First, a basic outline of beekeeping was created by surveying many kinds of beekeeping experts. The draft of the beekeeping checklist was created by a secondary advisory council. This draft was then sent to 14 beekeeping experts to confirm whether or not it was suitable as a management checklist. For collecting the experts' opinions, a direct visit survey was done through an arranged questionnaire. Additionally, a basic management checklist blueprint was reviewed by many experts. In the third stage, a Delphi survey method was utilized with a special Delphi questionnaire. In this stage, experts who participated in the first and second stages were excluded. As there were uncertain answers among them, a second Delphi survey was done. As a result of this survey, all answers were agreed among them. Results - From the results of this survey, four subjects in the management accomplishment index were determined. These are farming scale, average product per beehive, the sale price of honey (1kg), and the number of bee plates in the beehive. In the case of the management checklist content, five items were determined. These are beekeeping farming facilities, the environment around the farm land and general management, the product management of the beekeeping harvest, the management of the disease and pest, and farming management. This checklist will be utilized for beekeeping farmers to implement in a management situation. Conclusions - These days, the number of beekeeping farmers is increasing. The management checklist for beekeeping farmers will be used to improve their farming situation and marketing. Beekeeping farmers can understand their management by reviewing their checklist. After checking, the situation of management can be analyzed. Farmers can supplement weaknesses with expert advice. This checklist will be used by agricultural technique extension workers for farming management consulting. This checklist has to be complemented by a change in the management of the environment. This checklist will be delivered to beekeeping farmers after a verification survey is done. The result of the checklist score will be utilized for a benchmarking service to be implemented for beekeeping farmers to utilize.

공학적 기법을 응용한 카드뮴의 흡입독성 연구를 위한 초음파 네뷸라이져의 설계 그리고 광산란 광도계를 이용한 성능평가 (Design of Ultrasonic Nebulizer for Inhalation Toxicology Study of Cadmium with Application of Engineering Methodology and Performance Evaluation with Light-Scattering Photometer)

  • 정재열;도날드밀턴;김태형;이종영;정명수;고광재;김상덕;강성호;송용선;이기남
    • 동의생리병리학회지
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    • 제16권3호
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    • pp.464-471
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    • 2002
  • Author applied several engineering methodologies to classical ultrasonic nebulizer to cope with it's demerits. After several trials and errors, we got the several meaningful results. To evaluate the modified ultrasonic nebulizer for inhalation toxicology of cadmium, author used light-scattering photometer. This paper is the one part of inhalation exposure systems for inhalation toxicology study of cadmium. According to the testing conditions, source temperature 50℃ and inlet-duct band temperature 150℃, aerosol generation results for sodium chloride and cadmium chloride were as followings: Coefficients of variation(CV) of sodium chloride and cadmium chloride for repeated trials were 3.38 and 4.77 for 10g, 2.47 and 5.02 for 5g, and 4.70 and 2.98 for 2.5g. All the CVs were within 10% of acceptance variability. Count Per Minute(CPM) changes of NaCl and CdCl₂ for 5 repeated trials were similar. CPM ratios of CdCl₂/NaCl were 1.13 for 10g, 0.76 for 5g, and 1.06 for 2.5g. Relative aerosol generation of cadmium chloride to sodium chloride was the highest in 10g. Efficiency increases of 24.50% for 5g NaCl, 14.91 % for 2.5g NaCl, and 16.48% for 2.5g CdCl₂ with respect to theoretical efficiency were observed but 0.04% efficiency decrease was observed in 5g CdC₂. According to the modifications of source temperature(20, 50, 70℃) and inlet-duct band temperature(20, 50, 100, 150, 200℃), aerosol generation results for NaCl and CdCl₂ were as followings: CPM trends for each quantity excepting 10g NaCl in inlet-duct band temperature 200℃ were similar, and the highest CPM was observed in source temperature 70℃ to each inlet-duct band temperature. The highest CPMs to 10, 5, and 2.5g NaCl were observed in source temperature 70℃ and inlet-duct band temperature 20℃. Aerosol generation of cadmium chloride was increased with the higher source temperature, excepting inlet-duct band temperature 200℃. The highest CPMs for 10, 5, and 2.5g CdCl₂ were observed in source temperature 70℃ and inlet-duct band temperature 20℃, and this trend was similar to NaCl aerosol generation The highest CPMs for 10, 5, and 2.5g CdCl₂ were observed in source temperature 70℃ and inlet-duct band temperature 20℃, and this result was similar to NaCl aerosol generation. Observed efficiencies of 5 and 2.5g NaCl were similar to ifs theoretical efficiency but -3.08% efficiency decrease of 5g CdCl₂, 17.47% efficiency increase of 2.5g CdCl₂ were observed. CPM ratio of CdCl₂/NaCl of 10g was different to 5 and 2.5g, and 2.5g ratio was higher than 5g ratio. In conclusion, to get maximum aerosol generation for NaCl and CdCl₂ will be the conditions that set the appropriate inlet-duct band temperature for each materials and increase the source temperature. Sodium chloride can be used to evaluate the performance and predict the concentration for cadmium aerosol in aerosol generator and inhalation exposure system.

흡입독성 연구를 위한 2730ppm 납 네뷸라이징 용액에서 발생된 에어로졸의 입경분석 (Particle Size Analysis of Lead Aerosol with the use of 2730ppm Lead Nebulizing Solution for Inhalation Toxicology Study)

  • 정재열;강성호;김삼태;이은경;송용선;이기남
    • 동의생리병리학회지
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    • 제17권2호
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    • pp.518-524
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    • 2003
  • Ultrasonic nebulizer with the application of new engineering methodology and the design of electronic circuit was made for lead inhalation toxicology study and 2730ppm lead nebulizing solution was used to generate lead aerosol. After modification of source and inlet temperatures, the results of particle size analysis for lead aerosol were as following. The highest particle counting for source temperature 20℃ was 39933.66 in inlet temperature 100℃ and particle diameter 0.75tLm. The highest particle counting for source temperature 50℃ was 39992.71 in inlet temperature 250℃ and particle diameter 0.75μm. The highest particle counting for source temperature 70℃ was 37569.55 in inlet temperature 50℃ and particle diameter 0.75μm. The ranges of geometric mean diameter(GMD) were 0.754-0.784μm for source temperature 2℃, 0.758-0.852μm for source temperature 50℃, and 0.869-1.060μm for source temperature 70℃. The smallest GMD was 0.754μm in source temperature 20℃ and inlet temperature 20℃, and the largest GMD was 1.060μm in source temperature 70℃ and inlet temperature 250℃. The ranges of geometric standard deviation(GSD) were 1.730-1.782 for source temperature 20℃, 1.734-1.894 for source temperature 50℃, and 1.921-2.148 for source temperature 70℃. The lowest GSD was 1.730 in source temperature 20℃ and inlet temperature 20℃, and the highest GSD was 2.148 in source temperature 70℃ and inlet temperature 250℃. Lead aerosol generated in this study was polydisperse. The ranges of mass median diameter(MMD) were 1.856-2.133μm for source temperature 20℃, 1.877-2.894μm for source temperature 50℃, and 3.120-6.109μm for source temperature 70℃. The smallest MMD was 1.856μm in source temperature 20℃ and inlet temperature 20℃, and the largest MMD was 6.109μm in source temperature 70℃ and inlet temperature 250℃. Slight increases for GMD, GSD, and MMD values were observed with same source temperature and increase of inlet temperature. MMD for inhalation toxicology testing in EPA guidance is less than 4μm. In this study, source temperature 20℃ and 50℃ with inlet temperature from 20℃ to 250℃ were conformed to the EPA guidance, but inlet temperature 20℃ and 50℃ for source temperature 70℃ were conformed EPA guidance. MMD for inhalation toxicology testing in OECD and EU is less than 3μm. In this study, source temperature 20℃ and 50℃ with inlet temperature from 20℃ to 250℃ were conformed to the EPA guidance, but none for source temperature 70℃.