• Journal of fish pathology
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• v.8 no.1
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• pp.23-30
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• 1995

We had reported the infection rates of trematode larvae, Cercaria tapidis and C. harengulae in the gonad tissues of Tapes philippinarum and Solen strictus in the estuary of Kum river, the west coast in Korea in 1980~1982. At the same sites from January 1994 to January 1995, we investigated the variation of the infection rates of these trematode larvae in the two clams. The results are follows. The infection rate of C. tapidis parasitized in T. philippinarum increased in 2.4 times (14.0%) higher than that (5.7%) in 1981. Monthly maxium infection rate was 32.0% in October 1994. Comparing the rate (23.3%) in December 1981, the rate in 1994 showed a higher trend than that in 1981. The mean infection rate of C. harengulae in T. philippinarum showed 2.3% in 1994. Comparing that (5%) in 1980, it showed a decreased rate than that in 1980. And monthly maximum infection infection rate of this clam was 6.7% in May 1994, compared with the rate (19.0%) in March 1980. It appeared furthermore decreased rate in 1994. The mean infection rate of the year of C. harengulae in S. strictus was 6.9% in 1994, while it was 10.2% between 1981 and 1982. It showed a decreased trend in 1994. Monthly maximum infection rate was 23.4% in August 1981, while it was 13.3% in April 1994. It showed a decreased trend in 1994 also. In case of C. tapidis the more large sizes of shell length the more infection rates were higher as same in the investigation in 1980, while in C. harengulae the smaller sizes, the more infection rates showed a higher trend.

• 발명특허
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• v.6 no.1 s.59
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• pp.4-4
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• 1981

• KOREAN POULTRY JOURNAL
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• v.6 no.3 s.53
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• pp.23-27
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• 1974

농수산부는 지난해 12월 1973년$\~$1981년의 장기 축산진흥계획을 발표하였는데 기본시책은 급증하는 육류수요에 대처하고, 유휴국토를 생산자원화하며, 축산물 수출의 확대와 농민의 소득증대에 기여하는 것을 골자로 하고 있다. 농수산부는 74년 1월 29일 장기 축산진흥계획을 원활히 수행하기 위하여 각시도 식산국장 회의를 열고 축산계획과 74년의 주요시책을 시달하였다. 축산진흥 장기계획의 내용은 다음과 같다.

• Journal of the KSME
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• v.21 no.5
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• pp.335-342
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• 1981

우리나라에서도 급속한 산업발전에 따라 공해문제가 날로 심각하게 대두되고 있으며, 특히 대 도심지의 자동차 배기가스로 인한 대기오염 (Air Pollution)은 큰 사회적 문제로 되고 있다. 이에 법적인 규제가 절실하게 필요하게 되어 1977년 12 월 31 일 환경보전법이 공모되고 자동차배 출가스의 규제조합이 수립되었다. 한편 행정직으로 환경청이 설립되어 이를 전달하게 되었으며 아울러 환경관계법령집(1981 년 5월)이 완성을 보았다. 그러나 자동차배출가스의 허용기준치가 자동차공업이 발달한 선진국에 비하여 너무도 미흡한 단계인바 국가적 차원에서 집중적인 대 책강구와 규제를 강화시켜야 할 실정이다. 따라서 우리나라와 선진제국들의 자동차배출의 규제 치및 대책방법 등을 고찰하고, 금후의 개발과 기술적 문제점들을 기술하고자 한다.

• The tire
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• s.93
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• pp.40-41
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• 1981

일본도로공단에서는 요즈음 동공단에석 관리하고 잇는 전국고속도로와 일반유료도로에서 1979년(1월~12월)에 발생한 교통사고와 차량고장의 건수를 도로별ㆍ원인별로 조사하는 한편 차종별ㆍ원인별로도 종합분석 하였다.

• The tire
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• s.104
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• pp.51-52
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• 1983

본자료는 최근 일본도로공단에서 관리하고 있는 전국 고속도로와 일반유료도로에서 1981년 (1월~12월)에 발표한 교통사고 및 차량고장건수에 대해 동공단에서 발표한 도로별ㆍ원인별 및 차종별ㆍ원인별로 조사분석한 결과를 종합 정리한 것이다.<편집자 주>

• 한국해양학회지
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• v.19 no.1
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• pp.11-17
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• 1984

The abnormal cooling phenomenon occurred in the coastal areas of East Sea of Korea in summer, 1981 is studied on the basis of the oceanographical data obtained by the National Fisheries University of Pusan, in July, 1981 and by Fisheries Research and Development Agency of Korea during 1961 to 1981 and by Japan Meteorological Agency in 1975 and 1981. Th vertical section of temperature along 130 E showed that the warmer waters more than 10 C occupied at upper layer of about 75m depth in south of 35 30'N the layer changed rapidly thinner as 20m th 30m depth. In the areas of East Sea during 1966 to 1981, the temperature fluctuations at 100m depth ranged greatly in standard deviation from 2 C to 4 C. The temperature anomaly in 1981 was about 1.5 times of the standard deviation and at the upper layer of 150m depth the temperatures became colder by 5 -10 C than average values in August, 1961-1975. The 10 C isotherm at 100m depth in 1981 appeared between 35 and 36 N, shifting southward 20 to 120 miles than mean year. These results showed that the abnormal cooling phenomenon in the areas of East Sea of Korea in summer occurred mose predominantly in 1981 in period from 1966 to 1981

• Korea Petroleum Association Journal
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• no.12 s.10
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• pp.68-71
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• 1981

'80년 5월 ,하루 6만 배럴의 정유시설을 가동하기 시작한 쌍용은 81년 1월에 국내최초로 윤활기유 제조부문도 가동개시했다. 이는 전량수입에 의존하던 윤활유기유의 국산대체를 의미하는 것이다. 또한 그 제조공정은 일본, 캐나다에 이어 세계에서 세번째의 성공적인 기술축적인 것이4다.

• Journal of Korean Electronics
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• v.2 no.3
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• pp.86-99
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• 1982

• Journal of the Korean Wood Science and Technology
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• v.42 no.6
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• pp.653-658
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• 2014

This research was carried out to investigate equilibrium moisture content (EMC) of wood in outdoor locations in Korea. EMC was calculated using Hailwood-Horrobin equation for 73 different locations in Korea using the 1981 to 2010 climate normal data obtained from the Korea Meteorological Admnistration (KMA). Daegu showed the lowest values of EMC (11.5), and the highest EMC values (15.8) was found in Heuksando. Considering the season effect, summer (June, July, August) showed the highest values 15.3, followed by autumn (September, October, November) 13.7, winter (December, January, February) 12.2, and spring (February, March, April) 12.0. Monthly EMC showed the lowest values 11.6 in April and July showed the highest EMC values 16.1. The smallest changes in monthly EMC were found in Jeju island and Heuksando showed the largest values 8.7. A proper wood drying based on average EMC is more required in the regions with larger variation in EMC.