• 제목/요약/키워드: Small Size Tube

검색결과 132건 처리시간 0.017초

조개류에 기생하는 흡충류에 관한 연구 IV. 백합(Meretrix lusoria)에서 검출되는 Himasthla kusasigi YAMAGUTI, 1939에 대하여 (Studios on a Trematode Parasitic in Bivalves IV. On the Metacercaria of Himasthla kusasigi YAMAGUTI, 1939(Trematoda) found in the clam, Meretrix lusoria Roding)

  • 김영길;전세규
    • 한국수산과학회지
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    • 제17권1호
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    • pp.61-67
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    • 1984
  • 서해안 내초도 및 부안돈지산 백합의 족부 근육내에서 Himasthla kusasigi의 피낭유충을 다량 검출하고, 충체의 형태와 기생률을 조사하였고, 검출된 피낭유충을 괭이갈매기에 먹여 10일, 25일후 충체를 분리함으로써 동흡충의 감염 경로를 규명하였다. 검출된 피낭유충의 크기는 $210{\sim}230{\times}220{\mu}m$, 탈낭된 유충은 $420{\times}160{\mu}m$이며, 두극은 좌우 우극을 포함하여 31본이다. 구흡반은 $52{\times}52{\mu}m$이고, 복흡반은 $112{\times}100{\mu}m$으로서 충체의 후방에 위치하며 식도는 가늘고 길며, 장은 복흡반 상단에서 좌우로 분지되어 중체 후단에 까지 달한다. 내초도산 백합 448개중 441개, 부안산 123개중 118개가 감염되어 각각 $98.43\%,\;95.93\%$의 감염률을 나타낸 반면에 서산산은 동흡충이 검출되지 않았다. 조개의 크기가 클수록 기생충수가 많았고, 최고 99개(각장 6.64cm), 최저 1개(각장 2.05cm)이었다. 조개에서 얻은 피낭유충 120개를 괭이갈매기에 먹여25일후 102개의 성충을 장에서 분리하였다. 이 성충은 크기가 $4.8{\sim}7.5{\times}0.22{\sim}0.24mm$이었고, 구흡반은 $68{\sim}120{\times}70{\sim}120{\mu}m$, 인두는 $80{\times}50{\mu}m$, 복흡반 $630{\sim}680{\times}610{\sim}680{\mu}m$, 두관부는 $48{\sim}75{\times}10{\mu}m$의 두극 31개가 배열되어 있다. 충난은 $92{\sim}95{\times}58{\sim}60{\mu}m$의 크기이다. H. kusasigi의 제이중간숙주는 백합이며 종숙주는 괭이갈매기 및 삑삑도요새이다.

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다변량 프로빗 모형을 이용한 가전제품 구매의 상관관계 분석 (Correlation among Ownership of Home Appliances Using Multivariate Probit Model)

  • 김창섭;신정우;이미숙;이종수
    • 마케팅과학연구
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    • 제19권2호
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    • pp.17-26
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    • 2009
  • As the lifestyle of consumers changes and the need for various products increases, new products are being developed in the market. Each household owns various home appliances which are purchased through the choice of a decision maker. These appliances include not only large-sized products such as TV, refrigerator, and washing machine, but also small-sized products such as microwave oven and air cleaner. There exists latent correlation among possession of home appliances, even though they are purchased independently. The purpose of this research is to analyze the effect of demographic factors on the purchase and possession of each home appliances, and to derive some relationships among various appliances. To achieve this purpose, the present status on the possession of each home appliances are investigated through consumer survey data on the electric and energy product. And a multivariate probit(MVP) model is applied for the empirical analysis. From the estimation results, some appliances show a substitutive or complementary pattern as expected, while others which look apparently unrelated have correlation by co-incidence. This research has several advantages compared to previous literatures on home appliances. First, this research focuses on the various products which are purchased by each household, while previous researches such as Matsukawa and Ito(1998) and Yoon(2007) focus just on a particular product. Second, the methodology of this research can consider a choice process of each product and correlation among products simultaneously. Lastly, this research can analyze not only a substitutive or complementary relationship in the same category, but also the correlation among products in the different categories. As the data on the possession of home appliances in each household has a characteristic of multiple choice, not a single choice, a MVP model are used for the empirical analysis. A MVP model is derived from a random utility model, and has an advantage compared to a multinomial logit model in that correlation among error terms can be derive(Manchanda et al., 1999; Edwards and Allenby, 2003). It is assumed that the error term has a normal distribution with zero mean and variance-covariance matrix ${\Omega}$. Hence, the sign and value of correlation coefficients means the relationship between two alternatives(Manchanda et al., 1999). This research uses the data of 'TEMEP Household ICT/Energy Survey (THIES) 2008' which is conducted by Technology Management, Economics and Policy Program in Seoul National University. The empirical analysis of this research is accomplished in two steps. First, a MVP model with demographic variables is estimated to analyze the effect of the characteristics of household on the purchase of each home appliances. In this research, some variables such as education level, region, size of family, average income, type of house are considered. Second, a MVP model excluding demographic variables is estimated to analyze the correlation among each home appliances. According to the estimation results of variance-covariance matrix, each households tend to own some appliances such as washing machine-refrigerator-cleaner-microwave oven, and air conditioner-dish washer-washing machine and so on. On the other hand, several products such as analog braun tube TV-digital braun tube TV and desktop PC-portable PC show a substitutive pattern. Lastly, the correlation map of home appliances are derived using multi-dimensional scaling(MDS) method based on the result of variance-covariance matrix. This research can provide significant implications for the firm's marketing strategies such as bundling, pricing, display and so on. In addition, this research can provide significant information for the development of convergence products and related technologies. A convergence product can decrease its market uncertainty, if two products which consumers tend to purchase together are integrated into it. The results of this research are more meaningful because it is based on the possession status of each household through the survey data.

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