• 한국항공우주학회지
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• 제34권10호
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• pp.7-15
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• 2006

스트레이크를 부착한 이중 삼각 날개에서 스트레이크의 붙임각이 날개면 압력분포와 와류 특성에 미치는 영향을 실험적으로 연구하였다. 스트레이크 붙임각의 음(-)방향 증가(스트레이크가 주 날개 윗면으로부터 pitch-down방향으로 부착된 상태)는 날개 전체의 받음각을 증가시키는 것과 같은 효과를 가져와 날개 윗면의 부압의 크기를 증가시켰다. 이러한 스트레이크 붙임각 변화에 의한 날개 윗면 부압 분포 변화는 와류의 강도 변화에 기인하기 보다는 와류 중심이 날개면에 가까이 위치하는 것에 기인하였다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권22호
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• pp.9899-9903
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• 2014

Nasopharyngeal carcinoma (NPC) is an uncommon disease in most countries but occurs with much greater frequency in southern China. This study aimed to examine the secular trends of NPC in urban Guangzhou over the time period of 2000-2011 using data from the Guangzhou Cancer Registry. Age-adjusted annual incidence rates of NPC were calculated by the direct method using the WHO World Standard Population (1960) as the reference. The average annual percentage change (AAPC) was used as an estimate of the trend. A total of 7,532 new cases of NPC and 3,449 related deaths were registered. In both genders, the peak incidence occurred in the 50- to 59-year age group, and this age distribution pattern remained similar throughout. The AAPC in NPC incidence rates was -3.26% (95% CI: -5.4%--1.1) for males and -5.74% (95% CI: -8.9%--2.5) for females, resulting in a total decrease of 39.3% (from 22.14 to 13.44 per 100,000 population) for males and 48.6% (from 10.1 to 5.18 per 100,000 population) for females over this 12-year period. The AAPCs in NPC mortality rates were -4.62% (95%CI: -3.5%--5.7) for males and -6.75% (95% CI: -5.2%--8.3) for females, resulting in a total decrease of -46.1% (from 12.1 to 6.54 per 100,000 population) for males and 51.7% (from 4.14 to 2.00 per 100,000 population) for females. The age-adjusted incidence and mortality rates of NPC declined during 2000-2011 in urban Guangzhou but remained high. Future efforts to improve prevention, early detection and treatment strategies are needed.

• Asian Pacific Journal of Cancer Prevention
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• 제16권7호
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• pp.2653-2657
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• 2015

Nasopharyngeal carcinoma (NPC) is the second most common neoplasm of head and neck in Tunisia. The distribution is bimodal with a first period occurrence between 15 and 20 years old and a second peak at around 50 years of age. Undifferentiated carcinoma of nasopharynx type III (UCNT) is the predominant histological type (93.4%). Data of cancer registry of North Tunisia confirmed that it is an intermediate risk area for NPC with overall ASRs of 3.6 and 1.6/100,000 respectively in males and females. This study aimed to present the evolution of incidence rate of nasopharyngeal carcinoma over a period of 12 years (1994-2006). Data of cancer registry of North Tunisia (NTCR), covering half of the Tunisian population, were used to determine evolution of NPC incidence, calculated by 5 year periods. The estimated annual percentage change (EAPC) was used as an estimate of the trend. To best summarize the behavior or the data trend across years, we used a join-point regression program. Between 1994 and 2006, we observed negative annual average change of standardized incidence in men and women (-3.3%and -2.7%) also for the standardized incidences which showed a rather important decline (26.4% in males and 22.3% in females). The truncated age standardized incidence rate of NPC in adults aged of 30 years old and more (N= 1209) decreased by -0.4% per year from 1994 to 2006 over time in north Tunisia dropping from 6.09 to 4.14 person-years. However, the rate was relatively stable during this period among youths aged 0-29 years (N= 233) in both sexes. NPC demonstrated a favorable evolution from 1994-2006 probably due to a improvement in socioeconomic conditions.

• Asian Pacific Journal of Cancer Prevention
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• 제16권10호
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• pp.4447-4450
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• 2015

Background: Nasopharyngeal cancer is a disease with distinct ethnic and geographical distribution. The aim of this review was to describe the epidemiological characteristics of nasopharyngeal cancer in Iran from 2004 to 2009 because no systematic study has been performed to evaluate the trends of its incidence yet. Materials and Methods: The data were derived from the databases of the National Cancer Data System Registry in the period of 2004-2009. Nasopharyngeal cancers were classified according to the International Classification of Diseases for Oncology. Incidence rates and trends were calculated and evaluated by gender, age decade, and histopathology types. Results: A total of 1,637 nasopharyngeal cancers were registered in Iran from 2004 to 2009 giving an incidence of 0.38 per 100,000. The male-to-female ratio was 2.08:1. The trend of incidence was found to have increased, with a significant increase observed in males. Undifferentiated carcinoma was the most common histopathology type in all the age decades. Conclusions: Because the incidence of nasopharyngeal cancers in Iran has increased, especially in males, further studies are recommended for understanding of the etiological factors involved in the rise of the disease.

• Journal of Preventive Medicine and Public Health
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• 제42권4호
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• pp.261-266
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• 2009

Objectives : The aim of this study is to examine the cognitive function change related to aging, the incidence of cognitive impairment, and the association between apolipoprotein E polymorphism and cognitive impairment through a follow-up of the elderly with normal cognitive ability at baseline. Methods : Two hundred and fifteen subjects aged 65 and over were surveyed in February, 1998 (baseline survey), and their cognitive function was assessed again in 2003 1st follow-up) and the once again in 2006 (2nd follow-up). Ninety one subjects completed all surveys up through the 2nd follow-up and their cognitive function scores using MMSE-K (Korean Version of the Mini-Mental State Examination) and the distribution of apolipoprotein E allele were analyzed. Results : The cognitive function scores decreased with aging and the difference between baseline and the 2nd follow-up scores of the study increased with the age group. The incidence rate of cognitive impairment through an 8-year follow-up was 38.5% and higher in older age groups. Age was the only significant factor for incidence of cognitive impairment, but there was no significant association between apolipoprotein E genotype and incidence of cognitive impairment. Conclusions : The cognition of the elderly decreased with aging and the association of apolipoprotein E genotype with incidence of cognitive impairment was not significant in this study. To confirm the association between apolipoprotein E polymorphism and incidence of cognitive impairment further studies will be needed.

• Journal of the Korean Data and Information Science Society
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• 제20권1호
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• pp.149-158
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• 2009

쯔쯔가무시증은 가을철 유행성 출혈열 중 80%이상을 차지하는 질병으로 1주에서 2주의 잠복기를 가지는 것으로 알려져 있다. 우리는 그 잠복기간의 확률분포가 감마분포라 가정하고 후향연산식을 이용하여, ${\hat{\mu}}=309.92$$, ${\hat{\sigma}}=14.154$인 정규분포를 따르는 감염자 분포를 추정하였다. 감염자는 10월에 집중적으로 분포하는 것으로 나타났다. 이러한 감염자 분포형태는 발병자 수가 11월동안 급격하게 증가하는 것에 기인한다. 본 연구에서 추정한 감염확률에 의해 미래의 유병자수를 계산한 결과 최대 1200명이었고 이는 매년 증가하는 발병자 수의 경향을 반영하지 못한 한계가 있다. 또한 우리는 전염병 모형으로 잘 알려져 있고 전염발전 단계간의 상호작용을 고려하는 SIRS 모형을 적용해 보았다. 모수는 초기값으로부터 잘 근사되어 수렴하는 값으로 추정하였다.

• 소음진동
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• 제7권6호
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• pp.945-952
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• 1997

This paper shows the feasibility of the suggestion that the angle distribution of incident sound to panels might be gaussian, instead of the conventional uniform distribution in the analysis of transmission loss of panels. To prove the suggestion, the problems with the diffuse sound field in a reverberation room are examined by case studies and the comparision of the prediction with the measurement of sound transmission loss of walls are performed. The results of the comparision show good agreement between the two values.

• Journal of Periodontal and Implant Science
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• 제20권2호
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• pp.159.1-159.1
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• 1990

• Journal of Periodontal and Implant Science
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• 제13권1호
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• pp.67.2-67.2
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• 1983

• Journal of Preventive Medicine and Public Health
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• 제22권2호
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• pp.276-282
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• 1989

모성연령 및 출산순위의 변화가 출생시 체중에 미치는 영향을 알아보기 위하여 부산시내 1개 대학병원, 5개 종합병원,1개 병원, 1개 의원, 1개 조산소에서 분만된 1977년 7,786건과 1987년 8,671건의 단태아를 대상으로 산실의 분만대장에서 출생시 체중, 모성연령 그리고 출산순위를 조사하였다. 모성 연령은 1977년에 25-29세가 56.4%, 30-34세가 18.8%였으나 1987년에는 25-29세가 65.1%, 30-34세가 21.6%로 증가하였으며, 24세이하군과 35세 이상군의 출생아 비율은 감소하였다. 출산순위별 분포는 1977년에 1,2순위 출생아가 각각 56.9%, 28.8%였는데 1987년에는 각각 59.9%, 36.8%로 증가한 반면 3,4순위는 1977년에 10.6%, 3.6%에서 1987년에 각각 2.8%, 0.5%로 감소하였다. 저 체중아 출생률은 1977년에 5.3%였는데 1987년에는 4.0%였고, 이 가운데 직접표준화법을 응용하여 추정한 모성연령 및 출산순위별 변화가 저체중아 출생률 감소에 기여한 것은 10.7% 이었다. 나머지 89.3%는 모성 연령 및 출산순위별 저 체중아 출산률의 감소에 기인한 것이다.