• The Bulletin of The Korean Astronomical Society
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• v.42 no.2
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• pp.69.3-70
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• 2017

음력은 양력과 함께 우리가 사용하고 있는 달력이다. 천문법은 양력인 그레고리력을 공식 달력으로 규정하는 한편 음력 또한 병행사용이 가능함을 명시하고 있다. 하지만 이 음력이 구체적으로 어떠한 방법으로 제정된 달력인지를 공식적으로 규정한 추가적인 근거는 있지 않다. 이 때문에 지금까지는 관습적으로 음력을 사용해왔다. 이에 국가 천문역법 업무를 수행하는 한국천문연구원에서는 최근 음력(태음태양력) 운용지침을 제정하고, 음력과 관련된 업무는 이 지침을 근거로 수행하고 있다. 이 발표에서는 음력의 생산과 공표절차와 같은 현재 우리나라의 음력 운용 체계를 소개하고, 음력 운용지침의 제정 배경과 절차, 그리고 상세내용을 설명하고자 한다.

• The Bulletin of The Korean Astronomical Society
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• v.44 no.1
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• pp.45.1-45.1
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• 2019

대중에게 천문정보를 효과적으로 확산시키기 위해 최근에 다양한 시도들이 제시되고 있다. 천문달력을 제작 배포하는 일은 가장 전통적인 방법 중의 하나이다. 본 연구는 천문달력의 제작 배포가 천문정보의 확산에 어떤 기여를 하고 있는지 알아보기 위해 2006~2016년 사이 10년동안 한국천문연구원이 제작 배포한 천문달력과 그 외에 최근 제작된 국내 및 해외 천문달력에 수록된 내용들을 비교해 본 후, 천문달력 사용자들로부터 얻어진 피드백을 반영하여 개선한 전략을 수립하였다. 또한, 이를 실제 한국아마추어천문학회 천문달력 제작에 적용한 결과를 소개한다. 이를 바탕으로 향후 모바일 온리(Mobile Only) 시대를 맞아 천문정보 및 천문학의 효과적 확산 방향에 대해 논의해 보고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.861-864
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• 2013

기존의 애플리케이션 개발방식은 각각의 스마트폰 플랫폼에 종속되어 있기 때문에 플랫폼별로 매번 따로 개발하여야 하므로 비효율적이다. 반면, HTML5 기반 스마트 애플리케이션은 사용자의 스마트 폰이 안드로이드/iOS 여부에 관계없이 동일하게 동작한다. 본 연구에서는 Web DB와 Store를 활용한 캘린더를 구현하였으며, HTML5 UI Framework인 Sencha Touch를 사용하여 HTML5 기반 하이브리드 애플리케이션으로 제작하였다. 특히, Web DB와 Store를 활용하여 날짜 데이터를 다루는 방법, 날짜 기반 검색방법을 소개한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1226-1229
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• 2009

본 연구개발은 Windows CE 기반의 Navigation에 탑재될 부가 기능의 개발을 목표로 한다. Music Player, Photo viewer, World clock, Calendar, Currency/Unit converter, Calculator로 구분되는 각각의 기능을 개발하고, 이를 네비게이션에 장치에 탑재하여 네비게이션의 활용도와 가치를 높이고자 한다.

• Journal of Preventive Medicine and Public Health
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• v.49 no.5
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• pp.288-300
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• 2016

Objectives: Diagnostic medical radiation workers in Korea have been officially monitored for their occupational radiation doses since 1996. The purpose of this study was to design models for reconstructing unknown individual radiation doses to which diagnostic radiation technologists were exposed before 1996. Methods: Radiation dose reconstruction models were developed by using cross-sectional survey data and the personal badge doses of 8167 radiologic technologists. The models included calendar year and age as predictors, and the participants were grouped into six categories according to their sex and facility type. The annual doses between 1971 and 1995 for those who were employed before 1996 were estimated using these models. Results: The calendar year and age were inversely related to the estimated radiation doses in the models of all six groups. The annual median estimated doses decreased from 9.45 mSv in 1971 to 1.26 mSv in 1995, and the associated dose variation also decreased with time. The estimated median badge doses from 1996 (1.22 mSv) to 2011 (0.30 mSv) were similar to the measured doses (1.68 mSv to 0.21 mSv) for the same years. Similar results were observed for all six groups. Conclusions: The reconstruction models developed in this study may be useful for estimating historical occupational radiation doses received by medical radiologic technologists in Korea.

• Journal of Information Management
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• v.42 no.2
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• pp.103-120
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• 2011

The astronomical data obtained by observations of celestial objects movements are useful in our daily life. These data - such as 1) sunrise and sunset data, 2) data transformation between lunar calendar and solar calendar, 3) solar eclipse and lunar eclipse data, and 4) sun's altitude and azimuth data - were used to important things in the agricultural society and ancient kingdom. In the modern society, these data have been used continuously for the legal disputes, construction of buildings and the other areas. This is a good example of pure science data using directly in our life. However there are difficulties to public service because all the data were printed as an Almanac. Using MySQL, we constructed web-based service system which makes to use them easily. This database system was made for the quick search using the calculated orbital data of celestial bodies.

• The Korean Journal of Applied Statistics
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• v.8 no.1
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• pp.89-104
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• 1995

This paper is concerned with the method of estimating lifetime distributin from field data for products with multiple modes of failure. When product failures occur within warranty period, a manufacturer can obtain failure-record data; failure times, causes of failure, and covariates. Since these data are seriously incomplete for satisfactory inference, that is, only failures occured during warrantly period may be recorded, it is usually necessary to incoporate the failure-record data by taking a supplementary sample of items obtained following up a portion of products that survive warranty time. The log linear function is considered as a model for describing the relation between failure time of a product and covariates. General methods for obtaining pseudo maximum likelihood estimators(PMLEs) for the parameters are outlined and their asymptotic properties are studied, and specific formulas for exponential or Weibull distribution are obtained. Effects of follow-up percentage on the PMLEs are investigated. Extensions to calendar time warranty or calendar and obtaining time warranty are also considered.

• Korean Journal of Acupuncture
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• v.23 no.4
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• pp.59-65
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• 2006

Objectives : By comparing the correspondence of Three Eums and Yangs (三陰三陽) to calendr in ${\ulcorner}Somun\;Make'ae{\lrcorner}$ with twelve principal divinatory symbols, this paper intends to explain the exterior and interior of meridian system using the phenomena of the trigrams from Juyeok(卦). It also tries to relate the phenomena of the trigrams with the characteristics of the original Gi (本氣) of Three Em and Yangs tough the interpretation of Three Eums and Yangs assigned to twelve principal divinatory symbols. Methods : This paper compares the correspondence of Three Eums and Yangs to calendar in ${\ulcorner}Somun\;Make'ae{\lrcorner}$ with twelve principal divinatory symbols. By this, it traces the making of the exterior and interior relationship between Taeeum (太陰)-Yangmyeong (陽明), Soeum (少陰)-Taeyang (太陽), and Gworeum (厥陰)-Soyang (少陽) through the phenomena of trigrams assigned to Three Eums and Yangs. It also interprets Three Em and Yangs assigned to twelve principal divinatory symbols, using the original Gi of the six atmospheric influences(六氣). Results and Conclusions : Three Eums and Yangs in ${\ulcorner}Somun\;Make'ae{\lrcorner}$ signify the six meridians of the leg. Soeum (少陰) is assigned to October in ${\ulcorner}Somun\;Make'ae{\lrcorner}$ but it is more appropriate to assign it to July. If Soeum (少陰) is assigned to July, Three Eums and Yangs have phenoma of the trigrams with Em and Yang lines (陽爻) counter to each other, and can be explained as the exterior and interior relationship. lastly, in case of Three Eums and Yangs assigned to twelve principal divinatory symbols, the phenomena of the trigrams can be interpreted as the original Gi of Three Eums and Yangs.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.5
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• pp.501-506
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• 2015

This study seeks to analyze ships traffic characteristics according to water time in order to provide the necessary data for efficient traffic management development. To analyze maritime traffic volume according to water time, 1 year amount of solar calendar data were converted into lunar calendar, and then applied the traditional water time system of West Sea by using AIS(Automatic Identification System) observation data gathered in Mokpo port for a year of 2013. As a result, it was found herein that the number of outbound ships was larger on the $2^{nd}-3^{nd}$ water times than the $7^{th}$ water times by 23-24 %. And the number of inbound ships was higher on the $12^{th}-13^{th}$ water times than the $9^{th}$ water time by 29-33 %. The hourly variation index of inbound and outbound ships according to time, in particular, was found to change in the form of sine function model. This study is expected to serve as a necessary basic material for development of maritime traffic management according to water time.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.37 no.1
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• pp.115-119
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• 2014

When the number of items of same type of industrial property is quite large, calculating depreciation for a group of such item may be more efficient than depreciating each item separately. Also, predicting the service life of a specific individual unit is very difficult to do with any degree of accuracy. Estimating the probable average service life (PASL) of many units (or dollars) is not an easy task; however, an average life of many units can probably be predicted with a much higher degree of accuracy than the life of some particular unit. Using the average of many units allows for some units having relatively short lives and some units having relatively long lives without specifying whether a particular unit will have a short or a long life. If the life of each vintage in an account are not estimated, then the broad group procedure can be used. The broad group procedure depreciates the several vintage in an account as a single group. The PASL for this procedure is the estimate of the average of lives of the individual dollars in the group. If the estimated PASL's of the vintages are not the same, then a weighted average PASL would have to be calculated for each calendar year. In this paper, we illustrate the calculations of accrual rates and the annual depreciation charge for each of the calendar years by the broad group depreciation procedure.