• Journal of the Korean Data and Information Science Society
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• 제24권4호
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• pp.901-909
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• 2013

A skewed double power function distribution is defined by a double power function distribution. We shall evaluate the coefficient of the skewness of a skewed double power function distribution. We shall obtain an approximate maximum likelihood estimator (MLE) and a moment estimator (MME) of the skew parameter in the skewed double power function distribution, and compare simulated mean squared errors for those estimators. And we shall compare simulated MSEs of two proposed reliability estimators in two independent skewed double power function distributions with different skew parameters.

• 한국식품과학회지
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• 제32권4호
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• pp.747-754
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• 2000

Comet assay를 이용하여 방사선 조사육의 조사여부 및 조사량을 판별해내는 방법을 개발하기 위해 1-10 kGy의 감마선 조사량으로 조사한 육조직에서 일어나는 DNA 손상을 측정하였다. Comet assay에 있어 최적의 comet image를 얻기 위해 세포 분리, 세포 lysis 및 전기영동에 대한 여러 조건들을 적용하여 최적의 조건을 확립하였다. DNA 손상도는 관찰되는 comet의 평균 tail length와 tail length에 의해 구분된 4 손상 등급에의 분포, 그리고 그 분포비율에 의해 본 연구에서 제시한 식에 의해 계산한 relative damage index(RDI) 값 등으로 비교 판정하였다. 평균 tail length와 RDI 값은 조사량이 증가함에 따라 증가하여 DNA 손상도가 증가됨을 나타내었으며, 평균 tail length으로는 조사량 간의 차이를 명확히 분별하기가 어려웠던 반면 RDI 값에 의하면 조사여부 및 조사량을 판별하기에 적합함을 알 수 있었다. 국내산 한우육과 수입 냉장육에 대하여 blind test를 실시한 결과 수입육이 높은 DNA 손상도를 나타내었는데 그 RDI 값은 방사선 조사에 의한 값보다는 비교적 낮은 것이어서 수입육의 DNA 손상은 방사선 조사가 아닌 저온처리의 결과인 것으로 판단되었다. 본 연구의 결과로부터 Comet assay가 우육의 방사선 조사여부 및 조사량 판별에 유용한 기술로 응용될 수 있을 것으로 판단되었다.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2007년도 한국지능정보시스템학회
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• pp.101-110
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• 2007

본 연구는 웹의 플랫폼화에 대응하기 위한 서비스 유통 및 소프트웨어 개발방식의 핵심이슈로 '규모의 경제'와 '서비스화'이라는 모순적인 요구를 동시적으로 해결하는 것임을 제시했다. 소프트웨어 관점에서 본 이른바 웹 2.0 시대의 주요한 특징은 웹의 플랫폼화와 롱테일 서비스 시장의 등장이다. 웹이 독립적인 유통채널로 기능하게 되는데, 본 연구는 개발자 및 사용자 커뮤니티를 구축하기 위한 플랫폼전략을 규모의 경제와 상호소통(Interaction)의 관점에서 분석했다. 플랫폼 전략에서 제기된 이슈를 해결하기 위해서는 소프트웨어 개발전략도 오픈소스 커뮤니티를 활용한 레고형 개발이 필요하다. 비용절감과 사용자 채널을 확보하기 위해서는 오픈소스 커뮤니티를 이용한 조직화방식이 필요하고, 고객화된 서 비스의 가격경쟁 력을 확보 하기 위한 레고형 개발 방법이 필요하다.

• Asian-Australasian Journal of Animal Sciences
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• 제6권1호
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• pp.79-86
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• 1993

Twelve docked and 12 intact Najdi lambs of equal numbers of males and females were slaughtered at 40 kg shorn shrunk body weight, Lipid in all empty body fat components; namely, subcutaneous, intermuscular, intramuscular, omental, mesenteric, channel, perirenal, pericardial, tail, viscera, bone and hide, were determined. Except for ram lambs, which had a lower percentage of lipid in intermuscular partition in loin cut, sex did not influence the relative proportion of subcutaneous or intermuscular fat in each wholesale cut. The data also showed that docking did not change the distribution of lipid in intermuscular and intramuscular fat partitions in each wholesale cut. Docked lambs tended to accumulate lower proportions of the lipid in subcutaneous fat component in the cuts located along the dorsal line than intact lambs. The total amount of lipid deposited in the empty body of ewe lamb was heavier in weight than that of ram lamb. Docking had no effect on the distribution of total lipid in the empty body, except for subcutaneous fat component, being greater in docked lambs than did intact ones. Generally, the highest proportion of fat was associated with subcutaneous depot followed, in order, by intermuscular, mesenteric, tail, intramuscular and omental fat partitions.

• 대한수의학회지
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• 제39권1호
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• pp.20-26
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• 1999

To investigate the regional distribution and relative frequency of the neurotensin-, pancreatic polypeptide(PP)- and gastrin/cholecystokinin(Gas/CCK)-immunoreactive cells in the gastrointestinal tract of the bullfrog(Rana catesbeiana) with developmental stages, group of bullfrogs subdivided into the tadpole with hindlegs, metamorphosed bullfrog with tail, 2 weeks after metamorphosed bullfrog and adult bullfrog, were stained by immunohistochemical methods (PAP methods). Neurotensin-immunoreactive cells were observed from the pylorus of the metamorphosed bullfrog with tail, but these cells were not detected after that periods. PP-immunoreactive cells were detected from the adult bullfrog in the pylorus, duodenum and ileum. These cells were most predominant in the pylorus. Gas/CCK-immunoreactive cells were observed from the adult bullfrog in the pylorus. According to these results, most of immunoreactive cells in the gastrointestinal tract of the bullfrog were appeared after the complete metamorphosed periods, in which the complete differentiation of structure of gastrointestinal tract were occurred, and variable changes of the regional distribution and relative frequency with developmental stages were observed.

• Animal cells and systems
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• 제3권1호
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• pp.97-102
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• 1999

In order to investigate the regional distribution and relative frequency of the serotonin-, somatostatin- and motilin-immunoreactive cells in the gastrointestinal tract GIT) of the bullfrog (Rana catesbeiana) with developmental stages, group of bullfrogs subdivided into the tadpole with hindlegs, metamorphosed bullfrog with tail, 2 wk after metamorphosed bullfrog and adult bullfrog, were stained by immunohistochemical methods (PAP methods). Multifarious changes of the regional distribution and relative frequency of the gastrointestinal endocrine cells were observed as developmental stages but motilin-immunoreactive cell ere not detected in this study. Serotonin-immunoreactive cells were detected from 2 wk after metamorphosed bullfrog in the whole GIT. The positive cells were predominant in the pylorus regions. In the adult bullfrog, these cells increased in fundus. On the other hand, somatostatin-immunoreactive cells were observed from the tadpole with hindlegs in the stomach regions. In the metamorphosed bullfrog with tail, they were found in the whole GIT except for the ileum, and increased with developmental stages except for rectum. In the rectum, these cells were not detected after that period. Our results show that most of the immunoreactive cells appear from completed metamorphosed periods when the histological structure of GIT is completely differentiated.

• East Asian Economic Review
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• 제24권3호
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• pp.253-273
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• 2020

This paper investigates the impact of the effective minimum wage, defined as the log difference between the minimum and the median wages, on wage inequalities in the OECD countries. Unlike the previous studies that focus on single countries in which the minimum wage has no cross-sectional variation and rely instead on within-country variations of wage distribution across regions or socio-economic characteristics, we use a country panel that allows for both cross-sectional and time-series variations in minimum wage. We also control for more factors than in the previous studies whose absence may cause endogeneity. Our results confirm the previous findings that increases in minimum wage alleviate the wage inequality at the lower tail of the wage distribution, while having little effect at the upper tail. The estimated effect is larger for women than for men, which is consistent with the fact that the share of workers who are directly affected by the changes in minimum wage is bigger among women than men. An application of the IVs of Autor, Manning and Smith (2016) supports the robustness of our findings.

• 응용통계연구
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• 제26권6호
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• pp.987-998
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• 2013

이 논문에서는 한국의 대기질을 결정하는 중요한 수치인 미세먼지(PM10)에 대한 통계적 고찰을 한다. 2011년 매시 관찰된 자료 분석을 토대로 미세먼지가 매우 높은 시차에서도 강한 양의 상관관계를 가지는 장기 종속 시계열의 특징을 보임을 밝힌다. 또한 주변분포는 꼬리가 두터운 모형으로서 로그-정규분포보다는 일반화 파레토 분포가 훨씬 더 자료를 잘 적합함을 보인다. 하지만 이러한 높은 상관관계는 종종 단순한 평균변화 모형에 의한 그럴듯싸한 가짜 효과에 기인하기도 하여 통계모형을 세우는데 많은 혼동을 준다. 따라서 이 논문에서는 강한 종속성이 장기 종속 시계열에 의한 것인지 아니면 비정상 평균변화에 의한 것인지 근본적인 물리적 모형에 대한 논의를 통계적인 가설 검정을 통해 살펴본다. 그 결과 미세먼지의 강한 종속성은 구조변화에의한 착시 효과임을 밝힌다.

• Preventive Nutrition and Food Science
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• 제7권3호
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• pp.323-326
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• 2002

Ionizing radiation can be used to sanitize herbs contaminated by various microorganisms. However, health concerns related to irradiation damage to complex molecules in plants necessitate that methods be developed to monitor such damage. To elucidate DNA damage of herbs caused by irradiation, the DNA comet assay was used for Astragalus membranaceus Bunge and Havenia dulcis Thumb, irradiated at 1, 5, 7, and 10 kGy. With increasing irradiation doses, the tails of comets became longer with average tail length increasing from 17 (non-irradiated) to 124 (10 kGy) $\mu$m in Astragalus membranaceus Bunge. Above 7 kGy, some of the tails were separated from the heads of comets. Distribution patterns of the tail length of In comets selected randomly in the irradiated herbs were analyzed to quantify the DNA damage. These results clearly suggest that the DNA comet assay is an effective and inexpensive tool for the detection of irradiation damage to DNA in herbs.

• 응용통계연구
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• 제2권1호
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• pp.48-53
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• 1989

본 연구에서는 t 분포 백분위점을 구하는 방법으로 표준정규분포의 백분위점을 이용하는 간접근사공식들과는 달리 p와 n만의 직접근사공식을 찾았다. Hoaglin이 $\chi^2$분포에 적용했던 탐색적분석과정을 거쳐서 찾아낸 이 공식은 그 형태가 간단하여 일상적인 자료분석에서 손쉽게 이용될 수 있을 뿐만 아니라 최대 상대오차가 1.2%밖에 되지않는 좋은 공식이다.