• Current Research on Agriculture and Life Sciences
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• v.4
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• pp.141-153
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• 1986

This study intends to document the existing cyclical fluctuations of garic and onion price at farm gate level during the period of 1966-1986 in Korea. The existing patterns of such cyclical fluctuations were estimated systematically by removing the seasonal fluctuation and irregular movement as well as secular trend from the original price through the moving average method. It was found that the cyclical fluctuations of garic and onion prices repeated six and seven times respectively during the same period, also the amplitude coefficient of cyclical fluctuations showed speed up in recent years. It was noticed that the cyclical fluctuations of price in onion was higher than that of in garic.

• KOREAN POULTRY JOURNAL
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• v.7 no.2 s.64
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• pp.37-44
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• 1975

사료협회 회원공장의 전체평균을 볼 때 155$\$$짜리 옥수수가 1월 4일이면 떨어지고 400 : 1의 적용을 받는 175$\$$짜리 옥수수는 2월 25일이면 떨어지기 때문에 2월 26일부터는 $\$$$174^{89}$의 485 : 1옥수수를 사용하게됨으로 1차 가격조정 14$\~$16$\%$ 인상후, 이 가격에 10$\%$+알파의 가격이 붙을 것이며 이와같은 가격은 7월말까지 지속될 것으로 전망된다.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.1 no.6
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• pp.54-60
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• 1980

7월과 8월의 이상기온으로 복숭아심식나방(桃姬心　忠)이 예년보다 한달이나 늦게 발생 전국 과수원에 피해를 주고 있는 것으로 나타났다. 예년같으면 8월 중에 나타나던 2 화기가 올해는 9월에 만연될 것으로 보여 과수농가에서는 예방과 방제에 각별히 유의해야 될 것 같다.

• Journal of Sericultural and Entomological Science
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• v.15 no.2
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• pp.68.2-68
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• 1973

1. 오갈병은 전국에 분포하고 최근지역에 따라 3∼4배씩 매년 발생이 급증한다. 2. 마름무늬 매미충은 1년 3세대 발생하며 1세대가 5월중순-7월초순이고 2세대가 7월중순-8월중순이며 3세대는 8월하순부터 10월초까지였다. 3. 마름무늬 매미충 산란은 가지의 하부에 산란하는 것이 많다. 4. 마름무늬 매미 충 월동란은 4월 24일에 안점기에 달하고 5월 5일부터 부화 시작한다.

• Digital Contents
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• no.1 s.116
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• pp.20-21
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• 2003

지난해 11월 대입수학능력시험이 치러지고 대입전형이 시작되면서 다양한 입시 관련 정보를 제공하는 사이트들의 트래픽이 대폭 상승했다. 전에 비해 신입생 전형제도가 복잡해지면서 다양한 입시 관련 사이트들이 자세한 입시정보 서비스와 채점 서비스, 지원대학 정보등의 각종 부가 서비스를 제공 하고 있어 수험생과 학부모의 큰 인기를 끌었던것으로 분석된다. 디지털대성학원은 순방문자수가 10월 36만명에서 11월 90만명으로 2배이상 증가했으며, 전체 순위도 10월 823위에서 11월 425위로 400위 이상 큰 폭으로 상승했다. 이밖에도 씨스쿨, 에듀피아가 각각 전월대비 46만명, 36만명이 증가한 99만명, 105만명을 기록했다.

• KOREAN POULTRY JOURNAL
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• v.53 no.10
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• pp.188-191
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• 2021

(사)소비자시민모임은 지난 5월 3일~9월 7일까지 서울시내 대형마트 4개사, 기업형슈퍼 4개사의 계란 가격(정상가 및 소비쿠폰 할인 가격)과 등급을 조사한 결과를 발표했다. 본고에서는 이 내용을 소개한다. - 9월 2주 가격, 6월 대비 30구는 8.1% 하락, 10구(-0.6%), 15구(-2.3%)는 거의 변동없어 - 9월 산지 가격, 6월 보다 10% 이상 하락, CJ, 풀무원 등 브랜드란은 산지 가격 하락에도 변동 없어

• Korean Journal of Environmental Biology
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• v.26 no.4
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• pp.355-366
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• 2008

The composition and abundance of mesozooplankton were studied from the five stations on the Bulgap stream near Yeonggwang, Jeollanamdo, Korea. Mesozooplankton samples were collected bimonthly in April, July, August, October, and December 2006 and February 2007. Total 44 taxa of mesozooplankton occurred with the highest abundance (31$\sim$53,230 indiv. m$^{-3}$) in October, and the fewest (16$\sim$97 indiv. m$^{-3}$) in December. Diversity index is the highest in July (1.072) and the lowest in October (0.386). The two copepod species, Pseudodiaptomus inopinus and Macrocyclops albidus were dominant during the study periods. A brackishwater species, P. inopinus occurred in the Bulgap stream during from August 2006 to February 2007. This species was the most dominant species (53,010 indiv. m$^{-3}$) in the stations that usually have low salinities (0.1$\sim$14.0 psu). M. albidus was predominated during from April to August 2006 in the freshwater stations.

• Journal of Korean Society of Forest Science
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• v.54 no.1
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• pp.36-40
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• 1981

with the chemical equilibrium formula by Hailwood and Horrobin, $$m=a{\cdot}((k_1k_2h)(1+k_1k_2h)^{-1}+(k_2h)_n-k_2h)^{-1})$$, based on absorption theory, monthly equilibrium moisture content(EMC) variations in southern Korea were predicted. The results were as follows: $$k_1=47370272{\cdot}10^{-7}+477345{\cdot}10^{-7}t-502775{\cdot}10^{-8}t^2$$ $$k_2=705940864{\cdot}10^{-9}+16979472{\cdot}10^{-10}t-555336{\cdot}10^{-11}t^2$$ $$w=2233848{\cdot}10^{-4}+694242{\cdot}10^{-6}+185328{\cdot}10^{-7}t^2$$ Here, it is temperature degrees in Celsius, k is the equilibria between hydrate water and dissolved water, k is the equilibria between dissolved water and the water vapour pressure surrounding atmosphere, w is the molecular weight of the polymer unit that forms the hydrate, h is the relative vapour pressure, And the formula was well agreed with the data when the constant values ${\alpha}$ were given to be 2200 in January, February, October, November and December, 1850 in March, April and May, 1920 June, July, August, and September seasonally.

• Korean journal of applied entomology
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• v.45 no.3 s.144
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• pp.275-282
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• 2006

Insect pests attacking the leaf of lettuce (Lactuca sativa) were surveyed in environmentally frendly leaf-lettuce-greenhouses in Hwaseong, Namyangju, and Suwon from 2003 to 2004. Sixteen insect species of eleven families in eight orders were collected in greenhouses. Among them, Acyrthosiphon solani, Frankliniella occidentalis, and Autographa nigrisigna were the most serious pest species because of their damage ratio was over 30%. Population of Acyrthosiphon solani showed the highest peak one or two times between mid-April and early June in both the second and the third cropping period. Frankliniella occidentalis reached the highest peak one or two times, the first peak between mid-June and the late July, and the second peak between the mid-August and the mid-October.Autographa nigrisigna reached the highest peak one or times between early June and late July and in the mid-August to late October. The highest peak occurrence of A. solami was observed in early June as many as 4,836 nymphs and adults per 100 leaves. And for F. occidentalis it was in early July occurring 437 larvae and adults per 100 leaves, for A. nigrisigna in early October occurring 42 larvae per 100 leaves. The density of F. occidentalis and its damage as well was greater in soil culture than in hydroponic culture, but in case of both A. solani and A. nigrisigna no such difference between cropping systems was found.

• Current Research on Agriculture and Life Sciences
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• v.6
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• pp.49-69
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• 1988

In order to develop a cropping system that can produce garlic in the period of short supply from March to April, effects of low temperature treatment of seed bulbs and planting dates, starting date of low temperature treatment, days of low temperature treatment on plant growth, maturity and yield were studied in Southern strain, 'Namhae' and in Northern strain, 'Euiseong' of garlic (Allium sativum). The results obtained were as follows. In Sorthern strain, sprouting was significantly enhanced by low temperature treatment only in Sep. 14, and Sep. 29 plantings. Days to sprout were least in 30 days of low temperature treatment of Sep. 14 planting and in 45 days treatment of Sep. 29 planting. When considering on the beginning date of low temperature treatment, a marked difference was observed between treatments started before July 31 and after Aug. 15. Sprouting was most enhanced in 45 days low temperature treatment of Aug. 15 and Aug. 30 plantings. In Northern strain, sprouting was en hanced by low temperature treatment in planting from Sep. 29 to Nov. 13 and low temperature treatment for 60 days was most effective. Effect of low temperature treatment on early plant growth was observed in Sep. 14 and Sep. 29 plantings, but the effect on plant growth at intermediate stage or thereafter was observed in up to Oct. 29 plantings. Optimun days for low temperature treatment on growth enhancement was 45 and 60 days in Southern strain and 60 days in Northern strain in each planting dates. In Southern strain, the longer the low temperature treatment and the later the planting date the less the number of leaves developed. In Northern strain, normal leaves were not developed in plantings from Sep. 14 to Nov. 13. In Southern strain, clove differentiation and bulbing were earlist in 45 and 60 days treatment of Sep. 14, Sep. 29, and Oct. 14 planting initiated on July 31 and Aug. 15. In Northern strain, clove differentiation and bulbing were earlist in 60 days treatment of Oct. 14 planting initiated on Aug. 15 and Aug. 30. In treatment initiated later than above, longer the low temperature treatment the earlier the clove differentiation and bulbing in both Southern and Northern strains. The earlier the initiation date and the longer of low temperature treatment, the earlier bolting in southern strain. In Northern strain, bolting was most enhanced in 45 and 60 days of low temperature treatment initiated on Aug. 15 and Aug. 30. The longer the low temperature treatment in plantings thereafter, the earlier the bolting. The earlier the planting date garlic bulbs. Harvest date was earliest in 45 and 60 days low temperature treatment started from July 31 to Aug. 30 in Southern strain, and it was in 60 and 90 days low temperature treatment initiated from July 31 to Aug. 30 in Northern strain. Bulb weight was heaviest in 45 days low temperature treatment of Oct. 14 planting and next was in 45 days treatment of Sep. 29 planting in Southern strain. In Northern strain, bulb weight was heaviest in 60 days treatment of Oct. 14 planting and next was in 45 days treatment of Oct. 14 planting. When considered in the aspect of the beginning date of low temperature treatment, bulb weight was heaviest in 45 days treatment started on Aug. 30 in Southern strain and in 60 days treatment started on Aug. 15 in Northern strain. A high negative correlation between days to harvest and plant height on January 12, and a high positive correlation between days to harvest and days clove differentiation were observed. This indicates that enhanced plant growth and clove differentiation induced by low temperature treatment advanced the harvest date. A high negative correlation between bulb weight and days to clove differentiation, days to harvest suggests that the enhanced clove differentiation result and in heavier bulb weight. From the above results, it suggested that early crop of garlic can be harvested by planting at the period of Sep. 29 to Oct. 14 after 45 days of low temperature treatment of seed bulbs of Southern strain. Then harvest date can be shortened by 30 days compared to control and garlic can be harvested in early April.