• Korea Petroleum Association Journal
• /
• no.8 s.162
• /
• pp.65-69
• /
• 1994

이 자료는 석유개발공사의 주간석유뉴스(94.6.17)에서 발췌요약한 것이다. <편집자 주>

• Korea Petroleum Association Journal
• /
• no.5 s.147
• /
• pp.13-20
• /
• 1993

이 자료는 일본의 중동경제연구소 연구주간 소도진씨가 작성, 월간「석유」지에 게재된 것을 옮긴 것이다. <편집자 주>

• Korea Petroleum Association Journal
• /
• no.5 s.135
• /
• pp.62-76
• /
• 1992

이 자료는 한국수출입은행의 주간해외투자정보호('92.4.18)에서 전재한 것이다.<편집자 주>

• Korea Petroleum Association Journal
• /
• no.7 s.231
• /
• pp.80-83
• /
• 2002

이 자료는 한국석유공사에서 발간하는 주간석유뉴스(2002. 5. 31)에서 발췌한 것임. -편집자 주-

• The Korea Swine Journal
• /
• v.24 no.9 s.277
• /
• pp.146-148
• /
• 2002

• LP가스
• /
• s.68
• /
• pp.53-57
• /
• 2000

이 자료는 '주간석유뉴스' 최근호에 실린 내용이다.

• Journal of Korean Society of Transportation
• /
• v.34 no.3
• /
• pp.222-233
• /
• 2016

Recently, mobile phone data was applied in travel demand modeling as a new source of dynamic population movement. This study is also aimed to estimate "occupancy population" during a given period of time within a given spatial region using mobile phone data. An occupancy population was defined as the number of people residing or moving within a given time and space. In case of Seoul Metropolitan area, we divided the area into a number of administrative districts as zones for analysis and estimated the occupancy population of each zone by mobile phone data collected by SK telecom Co., a wireless telecommunication provider in Korea. For the expansion of mobile phone data, a new concept of "communication probability" was introduced and applied in the estimation of occupancy population of each zone by the hour. We compared the estimated number with the daytime population and the daytime population index referred by the Statistics Korea. The results showed that a positive correlation existed between the estimated number and the statistical number by nationwide survey. It was concluded that mobile phone data could be more cost-effective sources than a conventional survey method to estimate the pattern of population movement by the hour or by the day.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.33 no.9
• /
• pp.89-96
• /
• 2005

This paper discusses the daytime atmospheric conditions and the possibility of daytime star detection with the purpose of practical use of the star sensor for daylight navigation. In order to estimate the daytime atmospheric data, we use the standard atmospheric model (LOWTRAN 7), from which atmospheric transmittance and radiance from background sky are calculated. Assuming the star sensor with an optical filter to reduce background radiation, different separation angles between the star sensor and the sun are set up to express the effect of the solar radiation. As considerations of field of view (FOV) of the star sensor, the variation of the sky background radiation and the star density of the detectable star are analyzed. In addition, the integration time to achieve a required signal-to-noise ratio and the number of the radiation-caused electrons of the charge coupled detector(CCD) working as the limit to daylight application of the star sensor are calculated.

• Proceedings of the KIEE Conference
• /
• 2006.07a
• /
• pp.76-77
• /
• 2006

본 연구를 통하여 전력수급계획에 필요한 연간 시간대별 총수요를 예측하는 산법을 개발하였다. 예측과정은 크게 평상일 예측과 특수일 예측으로 구분된다. 평상일의 경우는, 연중 최대수요가 발생하는 하절기 기상으로부터 연중 최대수요를 예측한 다음, 하향식 접근에 의해 주간-일간-시간대별 평상일 수요를 예측하며, 특수일 수요는 예측된 평상일 수요와 평상일 대비 상대계수 모형으로부터 예측한다. 예측의 정확도를 개선하기 위하여 시계열 자료에 가중치를 부여하고, 실적자료가 생길 때마다 자동으로 모형이 갱신되도록 하였으며, 수요예측 결과를 검증, 보정하기 위해 주간수요예측을 재수행할 수 있다. 또한 계획된 월간 전력량 제약에 협조하는 예측산법도 포함하였다.

• 한국해양학회지
• /
• v.30 no.1
• /
• pp.64-68
• /
• 1995

To investigate a proper sampling method for larval fish in the western coastal waters, the abundances of larval fish sampled at upper and lower layers during the day and nighttime were compared. The difference in the abundances at upper and lower layers seems to be related to the diurnal vertical migration of larval fish. Therefore, samples at upper layer during the day causes an underestimation of the number of species and the abundance. As the abundances through whole water column during the day is not significantly smaller than during the nighttime. samples obtained by oblique tow through whole water column during the day can be used to estimate the abundance of fish larvae.