• Proceedings of the Korean Association for Survey Research Conference
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• 2001.04a
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• pp.109.1-127
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• 2001

This paper offers a method to measure the distribution of niches of two types of social organizations, Internet sites and voluntary organizations, based on the socio-demographic characteristics of their members. It examines the niches of Internet sites based on age and education of site visitors and those of voluntary organizations based on age, education, and occupational prestige of their members. The method to measure organizational niches makes it possible not only to understand the niche width of organizations but also to examine the extent to which organizations potentially compete and coexist. This leads to a method to recognize the way organizational environments influence the performance of individual organizations ecologically.

• Korean journal of applied entomology
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• v.34 no.1
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• pp.70-74
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• 1995

A study on seasonal changes in age structure and fecundity of Gryllotalpa africana Palisot de Beauvois was conducted in Suwon from 1991 through 194. It seemed that most of newly hatched nymphs emerge to adults in September and October, so have a life cycle a year, and some overwinter as nymphs and emerge to adults from August, so have a life cycle tow years. The mean number of eggs per cell was $36.00\pm$2.84 for egg cells laid in the laboratory, and $47.68\pm$4.35 for egg cells collected in the field. Mean and range of the numbers of egg cells produced per female were $1.17\pm$0.19 and 0~3.

• Journal of The Korean Society of Integrative Medicine
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• v.1 no.3
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• pp.1-8
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• 2013

연구목적 : 본 연구의 목적은 선천성 사경을 가진 22명의 유아에 대해 임상적 양상과 물리치료 만족도 및 사경의 요인을 알아보는 것이다. 연구방법 : 설문지를 통해 유아의 성별과 연령분포, 사경의 요인, 사경의 관리, 사경의 물리치료를 조사하였다. 연구결과 : 1. 환자의 성별 및 연령분포는 남자아이가 9명(41%), 여자아이가 13(59%) 이었고, 연령분포는 1~4개월이 5명(22.7%), 5~8개월이 6명(27.3%), 9~12개월이 4명(18.2%), 그리고 1년 이상은 7명(31.8%) 이었다. 2. 사경의 정도는 경도가 3명(13.6%), 중등도 3명(13.6%), 중증 16명(72.8%) 이었고, 사경의 분만요인으로 정상분만 12명(54.5%), 재왕절개분만 8명(36.4%), 그리고 둔위분만 2명(9.1%)으로 나타났다. 산모의 건강상태에 따른 요인은 매우 양호 7명(31.9%), 양호 11명(50%), 약함 3명(13.6%), 그리고 매우 약함 1명(4.5%) 이었다. 사경의 요인으로 분석된 가족력, 임신, 분만 사이에는 특별한 관련성은 없었다. 3. 사경 환자가 물리치료를 받는 횟수는 매일 치료 9명(40.9%), 일주일에 2~3회 12명(54.5%) 이었고 물리치료에 대한 만족도는 매우 우수 4명(18.2%), 우수 15명(68.2%), 보통 3명(13.6%)로 나타났다. 결론 : 이러한 결과를 통해 물리치료가 선천성 사경에 매우 효과적이었다.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.715-719
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• 1998

한국정상인에서 휴식기의 뇌철류분포는 연령별, 성별에 따라 의의있는 차이는 없었으며, 뇌혈류예비능은 여자에서 남자보다 더 높았고, 연령에 따라 차츰 감소하는 양상을 보였다.

• The Korean Journal of Applied Statistics
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• v.21 no.6
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• pp.1045-1063
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• 2008

This paper derives conversion formulas from yearly-based absolute rates of decrements to monthly-based rates of decrement due to cause j under FI (fractional age independence) assumption that is a generalization of UDD assumption. Next, it suggests conversion formulas from monthly-based absoluterates of decrements to monthly-based rates of decrement due to cause j under FI assumption. In addition, it calculates conversion formulas from yearly-based rates of decrement due to cause j to the corresponding monthly-based absolute rates of decrements under FI assumption. Some numerical examples are discussed.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.340-341
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• 2000

제주도에 주 분포하는 소라, Batillus cornutus는 제주도 연안의 암초성 패류 중 가장 대표적인 패류이다. 그간 소라에 대하여는 TAC 적용등 자원관리를 위하여 여러 조사 및 연구등이 활발하게 보고되고 있으나, 연령형질이 없는 소라의 연령과 성장을 정확히 파악하기는 어려움이 많은 종이다. 따라서 연급군의 분리를 통한 소라의 성장 parameter를 추정하여 금후 합리적 자원관리를 위한 자원생물학적 특성치를 정립하기 위하여 성장식을 유도하였다. (중략)

• Clinical and Experimental Pediatrics
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• v.48 no.11
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• pp.1179-1186
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• 2005

Purpose : A universal standard of the birth weight for gestational age cannot be made since girth weight distribution varies with race and other sociodemographic factors. This report aims to establish the birth weight distribution curve by gestational age, specific for Korean live births. Methods : We used the national birth certificate data of all live births in Korea from January 2001 to December 2003; for live births with gestational ages 24 weeks to 44 weeks(n=1,509,763), we obtained mean birth weigh, standard deviation and 10th, 25th, 50th, 75th and 90th percentile values for each gestational age group by one week increment. Then, we investigated the birth weight distribution of each gestational age group by the normal Gaussian model. To establish final standard values of Korean birth weight distribution by gestational age, we used the finite mixture model to eliminate erroneous birth slights for respective gestational ages. Results : For gestational ages 28 weeks 32 weeks, birth weight distribution showed a biologically implausible skewed tail or bimodal distribution. Following correction of the erroneous distribution by using the finite mixture model, the constructed curve of birth weight distribution was compared to those of other studies. The Korean birth weight percentile values were generally lower than those for Norwegians and North Americans, particularly after 37 weeks of gestation. The Korean curve was similar to that of Lubchenco both 50th and 90th percentiles, but generally the Korean curve had higher 10th percentile values. Conclusion : This birth weight distribution curve by gestational age is based on the most recent and the national population data compared to previous studies in Korea. We hope that for Korean infants, this curve will help clinicians in defining and managing the large for gestational age infants and also for infants with intrauterine growth retardation.

• Economic and Environmental Geology
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• v.49 no.2
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• pp.155-165
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• 2016

Quartz schist - quartzite is often intercalated in metasedimentary rocks of Ogcheon belt or aligned parallel to the boundary between Yeongnam massif and Ogcheon belt. However, stratigraphic sequence and or geologic age of the rocks has been still variable among authors as Precambrian or Paleozoic. In this study, we carried out SHRIMP U-Pb age data of detrital zircons from Yeongam and Yeongsanpo areas and compared ours with other zircon ages from other areas. The detrital zircons from the studied area show no age younger than 1.8 Ga but yielded clusters at Neoarchean (2.5 Ga) and Paleoproterozoic (1.8 Ga). On the other hand, the age range of zircon U-Pb dating of Paleozoic quartzites yielded from Archean to middle Paleozoic and clusters at Paleoproterozoic, Neoproterozoic and Paleozoic. The characteristics of the zircon age range and the dominant age peak might become a key to classify the Proterozoic to Paleozoic quartz schists-quartzites, which ages are still remained under controversy. Based on the statistical results of the zircon ages in this study, quartz schist - quartzite from Yeongam and Yeongsanpo is considered to be deposited during Proterozoic.

• Journal of Korean Ophthalmic Optics Society
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• v.11 no.2
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• pp.121-129
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• 2006

Prevalence of refractive error have revealed variation in relation to ethnicity, educational level, age, gender, and social economic status. Especially prevalence of refractive error varies by country, estimation of prevalence of refractive error have shown increase in Asia than in Western world. The present report aimed to investigate the prevalence of refractive errors by the age and gender in Korean population without eye disease. A total of 960 subjects were sampled and their refractive error was determined using Auto refractometer. Prevalence of emmetropia was 29% and that for myopia and hyperopia was 67%, 4%, respectively. Astigmatism was 22%, and the simple astigmatism was 1%. However the compound astigmatism was 99%. Prevalence of refractive errors differed significantly among age and gender group in our results. The percentages of with-the-rule, against-the-rule and oblique astigmatism among people with astigmatism were 36.6%, 20.7% and 42.7% for right eye and 31.8%, 10% and 58.1% for left eye.

• The Journal of the Korean bone and joint tumor society
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• v.1 no.1
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• pp.38-44
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• 1995

Metastatic bone tumor is the most common bone tumor and 32.5% of all primary malignant tumors are eventually metastasize to bone. Metastatic bone tumor has been more frequently encountered disease in the orthopedic fields due to the greater longevity of life of the patients with primary visceral cancers by major advances in early detection, diagnosis, and surgical/radiotherapeutic/chemotherapeutic treatment of primary and metastatic lesions. Therefore, the epidemiologic data about the incidences and the patterns of bone metastasis is important. We reviewed 417 patients who were diagnosed and treated for metastatic bone tumor at Kosin University Medical Center from 1985 to 1993 to analyse the primary lesion, age and sex distributions, location of bone metastasis, patterns of metastasis according to the primary. The results were as follows : 1. The common origin of bone metastasis were lung(29.5%), stomach(15.3%), breast(11.3%), unknown(7.7%), cervix(5.3%), liver(4.8%) in order of frequency. 2. There were 251 men and 166 women and their mean age was 54.8 years and the peak age incidence was in 6th decades. Most cases(85.3%) were occured beyond 5th decades. 3. The preferred sites of metastatic deposits were spine(64.0%), pelvis(40.5%), rib(38.8%), femur(36.7%), skull(21.1%), humerus(13.9%), scapula(13.0%) in order of frequency. In the spine, thoracic(42.1%), lumbar(39.1%), cervical(13.2%), sacral(5.6%) vertebrae were involved in order of frequency. 4. Multiple bone metastases were more common(73.1%) than single metastasis(26.9%). 5. In the lung cancer, the peak age incidence was 6th decades, and the preferred sites of bone metastasis were spine, pelvis, femur. 6. In the stomach cancer, the peak age incidence was 6th decades, and the preferred sites of bone metastasis were spine, femur, pelvis. 7. In the breast cancer, the peak age incidence was 5th decades, and the preferred sites of bone metastasis were spine, rib, pelvis. 8. In the bone metastasis with unknown primary site, the peak age incidence was 7th decades, the preferred sites of bone metastasis were spine, femur, pelvis, and the common histologic types were adenocarcinoma and squamous cell carcinoma.