• KOREAN JOURNAL OF CROP SCIENCE
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• v.23 no.1
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• pp.5-13
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• 1978

An experiment was carried out to find out effective heading date and period of limited ripening in different regions of climatic conditions by sowing date and length of nursery stage of a new variety Milyang 23. Since varieties of Tongil line have a character of premature heading, these do not show the symptom of senescent even though length of nursey stage was delayed. And the delay of heading date is due to late transplanting date, on the other hand, length of nursery stage delayed.

• Journal of Environmental Health Sciences
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• v.20 no.2
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• pp.90-98
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• 1994

Introduction : Bovine mastitis is an economically and a hygienically important disease of dairy cows. Many factors predispose to bovine mastitis and an understanding of these is essential for systems of effective mastiris control to be formulated. The presence of non-pathogenic bacteria on body surfaces can protect against invasion by more pathogenic organisms. Bacteria of low pathogenicity (minor pathogens) are frequently isolated from the healthy bovine udder and may play an important role in protecting the udder from infection with pathogenic bacteria. The treatment of bovine mastitis is important for choosing adequate antimicrobias, and it take the base on the result of susceptibility to antimicrobias. Therefore, the current of numbers feeding dairy cattle were increasing and prevalence rate of bovine mastiris was occurred in 1.5~57.3%.(abbreviation)

• Journal of The Korean Society of Grassland and Forage Science
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• v.23 no.4
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• pp.265-270
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• 2003

This study was conducted to determine the influence of seeding date on growth, characteristic yield and chemical composition of Italian millet (Setaria italica) from April 20 to May 30, 2003(April 20, May 1, May 20 and May 30) in Jeju. A local variety was seeded on days to heading were lessened as seeding date was delayed. The plant height was longest when seeded on 1 May(131cm) than at the other seeding dates. Stem diameter, number of leaves, leaf length and leaf width had the similar trend with plant height. SPDA reading values were greater at earlier seedings. Fresh forage yield was greatest (43.28MT/ha) at 1 May seeding and decreased gradually before or after this seeding date. Dry matter yield, crude protein yield and total digestible nutrient (TDN) yield had nearly the same tendency with fresh forage yield. Crude protein, crude fat, NFE and TDN contents were greatest at 30 May seeding and then decreased earlier seedings. Crude ash and crude fiber content tended to decreased as seeding was delayed. Based on the these findings, optimum seeding date for forage production of Italian millet seems to be early May in Jeju island.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.14 no.4
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• pp.295-307
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• 2002

Water temperature, salinity, and DO concentration were measured vertically in the Chinhae-Masan Bay over the course of 1 year. The characteristics of the stratification were analysed using the measured water temperature and salinity data. The vertical DO concentration changes were also analysed through consideration of the degree of stratification and the level of sediment pollution. The results of the analyses show that the thermal stratification appears just before April and disappears after October. The salinity differences between the surface and the bottom were 3.9(equation omitted), 9.3 (equation omitted), 4.3(equation omitted) in April, August, and October, respectively. The DO concentration change averaged over water depth was 2.6(mg/L) in April; 8.3(mg/L) in June: 5.9(mg/L) in August; 7.2(mg/L) in September; and 4.4(mg/L) in October. The DO concentration changes were closely related to the levels of contamination and also to the effect of the mass-transfer inhibition between the surface and bottom layers due to the thermal and density stratification.

• Korean Journal of Ecology and Environment
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• v.34 no.3 s.95
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• pp.199-205
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• 2001

This study was investigated to the assessment of organic pollution using attached diatom assemblages in the Shinchon stream on April, June, September and December 1999. Diatoms were identified total 74 taxa which composed of 68 species, 4 varieties and 2 unidentified species. The Centrales were 5 taxa and Pennales were 69 taxa. Dominant species were Navicula subminuscula, Navicula saprophila and Nitzschia palea which were saprophilous taxa to organic pollution. N. palea was dominant species at st. $1{\sim}3$ on April, June and September and N. subminuscula was recorded as dominant species at st. 4 on June, September and December. N. saprophila was dominated only at station 4 on April. DAIpo values were ranged $0.4{\sim}15.3$ at all stations from April to December and the water qualities were polysaprobic states except to ${\alpha}-mesosaprobic$ state at st. 1 on June. If Navicula sp. was identified as saprophilous taxa, DAIpo value of this station will be 3.5 and water quality of the station will be polysaprobic state. This stream was assessed the water qualities of polysaprobic states.

• Clinical and Experimental Pediatrics
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• v.45 no.7
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• pp.896-901
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• 2002

Purpose : The aim of this study was to determine the epidemiology of Kawasaki disease in the Kyung Nam area and to evaluate whether the results of this epidemiological study could support infectious etiology. Methods : We sent a questionnaire to three training hospitals in the Kyung Nam area and retrospectively reviewed their medical records of Kawasaki disease from Jun. 1995 to Dec. 1999. Results : The total number of patients was 717 cases, with little differences of annual prevalence during the five years. In all cases, the monthly prevalence of Kawasaki disease was high in Apr. and Jul. At the eastern of Kyung Nam, the monthly prevalence was high in Apr. and Jul. in 1995 and 1996, Jul. in 1997, Apr. in 1998 and Apr. and Jul. in 1999. In the central area of Kyung Nam, the monthly prevalence was high in Apr. in 1995 and 1996, Apr. and Jul. in 1997 and Jul. in 1998 and 1999. In the western Kyung Nam, the monthly prevalence was high in Nov. in 1995, Aug. in 1996, Oct. in 1997, Dec. in 1998 and Nov. in 1999. Conclusion : In the eastern and central areas of Kyung Nam, the monthly prevalence of Kawasaki disease was similarly high in Apr. and Jul. However, in the western district, the prevalence was high in late fall and winter. We could not prove the hypothesis that Kawasaki disease occurred with the spread of single infectious agent, but the a nnually similar prevalence in eastern and central Kyung Nam supported the infection theory for the etiology of the disease.

• Korean Journal of Ichthyology
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• v.23 no.4
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• pp.261-268
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• 2011

To clarify the annual reproductive cycle of the Korean perch, Coreoperca herzi, the seasonal changes in gonadosomatic index (GSI), hepatosomatic index (HSI), histological aspects of gonad and liver, and plasma levels of sex steroid hormones were investigated from June 1994 to April 1996. The annual variations of GSI and HSI were positively related to the plasma levels of sex steroid hormones. Estradiol-$17{\beta}$ (E2) and testosterone levels were raised during the April to May. Based on the related results, annual reproductive cycle of the fish could be divided into five successive stages; 1) Growing stage (from February to March: GSI was increased rapidly and oocytes with yolk vesicle was increased. Nucleus migrates toward the animal pole. Spermatids were activated from the epithelial tissue of lobuli). 2) Maturation and spawning stage (from April to June: Oocytes were accumulated yolk globules. Active spermatogenesis was observed). 3) Degeneration or stagnation phase (from July to August). 4) Recovery phase (from September to November) and 5) resting phase (from December to January). The main spawning period was in May.

• Korean journal of applied entomology
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• v.32 no.4
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• pp.389-394
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• 1993

Seasonal fluctuation of Beet armyworm, Spodoptem exigua, adults and larvae were momtored by pheromone trap and direct obseration in the welsh onion field, respecLively. Adult peaked on mid~late November and occurred 4 Limes a year by pheromone trap at Yesan, 1990. There were 3 peaks a year at Asan, 1991. The highest number of adults were caught on early September. In Suwon, the yearly number of adults caught by pheromone trap was high in the order of 1990, 1991, and 1992. In 1992, the moLh was initily caught on mid April by pheromone trap at Koheung, Chonnam, and it vms 3 month earlier than that at Suwon. The larvae of beet armyworm at welsh onion field at Asan, 1991 was first found on late June and gradually increased until mid September. The density at peak occurrence was about 20 individual per 100 hills of welsh onion. The peak of the larvae appeared 20 days after peak emergence of adult. It is expected that there are 4 times of occurrence when the first egg of beet armyworm IS laid on mid May at Suwon. It takes 48, 25, 23, and 58 days to complete 1st, 2nd, 3rd. and 4th generation, respectively.

• Journal of Food Hygiene and Safety
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• v.18 no.1
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• pp.1-5
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• 2003

E. coli could cause a variety of different types of diseases, including diarrhea, urinal infection, peritonitis and infant septicemia. Ninety two E. coli strains (12.4%) were isolated among 742 seafood products in Seoul Garak fishery market from January to December in 2001. These isolates were serotyped as O24, O25, O29, O78, O112, O136, O146, O159, O166 and O168. Most E. coli strains were isolated from molluscs (28.1%), shellfishes (14.5%), fishes (10.4%) and crustaceans (4.7%) in summer. Therefore, we knew that E. coli could be contaminated in various seafood products.

• Journal of the Korean Society of Tobacco Science
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• v.1 no.1
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• pp.21-32
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• 1979

This experiment was carried out to fond out the proper transplanting time of burley tobacco since the transplanting dates In Jeonla Do varied from early April to late June. In this experiment , the first transplanting was lone on April 10 and continued until June, 20 with the total of 7 Plantings. The results of experiment from 1977 to 1978 showed no significant differences on value per kg (won /kg ) from April 10 to May 10 whether the plants were grown with mulching or non -mulching The yield and price per 10a were highest with May, 10 transplanting . The proper transplanting date obtained by regression analysis, however, was between May, 1 to May 5.