• Korean Journal of Poultry Science
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• v.48 no.1
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• pp.41-50
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• 2021

Although feather-sexing using sex-linked genes related to feather development is a widely used chick sexing method in the poultry industry, the feather-sexing method has yet to be used for Korean native chickens (KNCs). The purpose of this study was to construct a KNC feather-sexing line using early-feathering (EF) and late-feathering (LF) genes for industrial application. Using 557 reddish-brown KNCs as the basal flock, frequencies of the EF (k) and LF (K) genes were estimated to be 0.814 and 0.186, respectively. This indicating that it would be feasible to construct a feather-sexing line using this chicken group, and we accordingly constructed EF paternal and LF maternal lines. On the basis of test-cross for the selection of LF homozygous (KK) males in the maternal line, we confirmed that three of 40 chickens were homozygous males. The survival rate, body weight, days at first egg-laying, hen-day egg production, and egg weight were analyzed to compare the production performance of EF and LF chickens. The results revealed that EF chickens were characterized by a superior survival rate, whereas LF chickens were superior in terms of egg production rate. However, no differences between LF and EF chickens were detected with respect to other production performance parameters. In addition, assessment of the fitness of sexed chicks produced in the established KNC feather-sexing lines revealed that the accuracy of sexing was 98.6%. Collectively, these findings indicate the feasibility of constructing effective KNC feather-sexing lines with potential industrial application.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.33 no.4
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• pp.307-319
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• 2000

Community structure (seasonal fluctuation), taxon diversity, nematodes/benthic harpacticoids and nematodes/kinorhynchs ratios of meiobenthos were studied in the Gamak Bay, Korea. A series of samplings were carried out from April 1997 to May 1999. Meiobenthic organisms was collected by van Veen grab and three subcores of 34 mm in internal diameter were taken from each sediment sample. The total density of meiobenthos in each seasons was found to be the highest in May 1999, and the lowest in December 1998. Total density of meiobenthos at each station was the highest at Station 9 in May 1999 ($2,218 inds./10 cm^2$) and the lowest at Station 3 in December 1998 ($2 inds./10 cm^2$). The Gamak Bay seemed to have an individual number increased from the inner toward the outer stations. The highest number of meiobenthos was observed on 0.125 and 0.063 mm mesh size. In every season, over $80{\%}$ of the meiobenthos was composed of only four groups: nematodes, benthic harpacticoids, sarcomastigophorans and nauplius larvae of crustaceans. Seasonal fluctuation of meiobenthos was also studied. The nematodes/benthic harpacticoids(nematodes/kinorhynchs) ratios were studied as an index of pollution monitoring for benthic ecosystem at each station in each season. The value of nematodes/benthic harpacticoids ratio was the highest at the inner stations and the lowest at the outer stations in the Gamak Bay. Taxon diversity (H') was the highest at the outer stations and the lowest at the inner stations in the Gamak Bay. The value of nematodes/benthic harpacticoids ratio significantly increased from the outer toward the inner stations, whereas the taxon diversity (H') significantly increased from the inner toward the outer stations in Gamak Bay.

• Economic and Environmental Geology
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• v.54 no.5
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• pp.581-594
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• 2021

In 2020, about 132 million m³ of aggregate was produced in Korea. Of the total domestic aggregates produced in 2020, about 33.3 % was sand and about 66.7% was gravel. It estimated that of the 132 million m³ of aggregates in Korea in 2020, about 52% was produced by screening crushed aggregate, by 36% by forest aggregate, 3% by land aggregate, 5.6% by sea aggregate and 2.5% by washing each other, and 0.4% by river aggregate. This indicates that screening crushed aggregate and forest aggregate are the main producers of domestic aggregates. Leading producing metropolitan cities were Gyeonggi-do, Gyeongsangnam-do, Chungcheongbuk-do, Gangwon-do, Chungcheongnam-do, Incheon in order decreasing volume, which together accounted for about 72.4% of total product. In 2020, aggregates were produced in 153 cities, about 67% of the 231 cities of Korea, 38 local governments have developed aggregates of more than 1 million m³, and the combined production of the 38 cities accounted for about 65% of national total. This means that the aggregate extraction trend of local governments is becoming larger and more concentrated. In 2020, at 153 local governments, a total of 889 operations produced aggregates with 420 operations by permission, 469 operations by declaration. A review of production by size of operation indicated that about 17 million m³ (12.8% of the total aggregate) was produced by 14 operations reporting production of more than 1 million m³. In about 420 operations, the maximum period of permit is 32 years to at least 2 months. When the remaining period of permit is taken into account, only about 55% of active operations can be developed the aggregate after 2021. In order to maintain the permitted aggregate volume by 2020 level, it will be necessary to obtain an extension permit or find new operation sites for at least 200 or more operations.

• Health Policy and Management
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• v.34 no.2
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• pp.196-210
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• 2024

Background: In January 2018, revised elderly fixed outpatient copayment for the elderly were implemented. When people ages 65 years and older receive outpatient treatment at clinic-level medical institutions (clinic, dental clinic, Korean medicine clinic), with medical expenses exceeding 15,000 won but not exceeding 25,000 won, their copayment rates have decreased differentially from 30%. This study aimed to examine the changes of health utilization of elderly after revised elderly fixed outpatient copayment. Methods: We used Korea health panel data from 2016 to 2018. The time period is divided into before and after the revised elderly fixed outpatient copayment. We conducted Poisson segmented regression to estimate the changes in outpatient utilization and inpatient utilization and conducted segmented regression to estimate the changes in medical expenses. Results: Immediately after the revised policy, the number of clinic and Korean medicine outpatient visits of medical expenses under 15,000 won decreased. But the number of clinic outpatient visits in the range of 15,000 to 20,000 won and Korean medicine clinic in the range of 20,000 to 25,000 won increased. Copayment in outpatient temporarily decreased. The inpatient admission rates and total medical expenses temporarily decreased but increased again. Conclusion: We confirmed the temporary increase in outpatient utilization in the medical expense segment with reduced copayment rates. And a temporary decrease in medical expenses followed by an increase again. To reduce the burden of medical expense among elderly in the long run, efforts to establish chronic disease management policies aimed at preventing disease occurrence and deterioration in advance need to continue.

• The Korean Publising Journal, Monthly
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• s.249
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• pp.26-26
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• 1999

"제3의 길'은 계약한 지 22일 만에, 원서가 출간된 지 2개월 만에 나와 출고된 둘째 주에 베스트셀러 1위에 올랐다. 반면 "전지구적 자본주의에 눈뜨기"는 오랜 번역작업 끝에 출간시기를 이미 실기한 상황에서 세상에 나왔다. 학술서가 도식적 틀에서 벗어나 순발력 있게 대응할 때 출판시장은 살아난다.

• 주택과사람들
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• s.208
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• pp.26-29
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• 2007

새 기본형 건축비가 $3.3m^2$당 소형 주택은 431만8000원, 중대형 주택은 439만1000원으로 제시됐다. 건축비는 건축 형식이나 가구 면적, 층수, 동수, 베이, 용적률 등에 따라 차이가 나므로 기본형 건축비엔 한계가 있다. 이에 따른 한계점을 진단한다.

• 핵융합뉴스레터
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• s.46
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• pp.20-21
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• 2010

영화 "타이타닉"으로 유명한 제임스 카메론 감독의 "아바타"는 개봉 후 약 40일 만에 한국관객 1,000만 명을 돌파하며 흥행에 성공했다. 개봉 후 반년이 지난 지금까지도 영화에 대한 다양한 논의가 계속되고 있는 것은 물론 관객의 눈을 사로잡는 화려한 입체 영화 즉, 3D 영화의 새로운 장을 열어 더욱 의미가 큰 "아바타". 게다가 한국의 인공태양 KSTAR 장치의 기본 원리가 숨어 있어 그것을 찾아보는 재미까지 쏠쏠하니, 다시 한 번 판도라 행성으로 떠나 보자.

• The Monthly Technology and Standards
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• s.115
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• pp.40-41
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• 2011

BP는 멕시코 만 기름유출 사고 이후 지속저긴 석유시추활동을 위하여 미 연방규제보다 엄격한 안전과 환경표준을 자발적으로 도입할 예정이다.

• 건강소식
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• v.37 no.3
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• pp.16-17
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• 2013

한결같은 배우 박진희(35). 평소 '여자의 진정한 매력은 외모보다 내면의 아름다움'이라고 말할 만큼 자기관리가 철저한 배우다. 그래서 그런지 느낌도 외모도 데뷔시절의 풋풋함 그대로다. 맑고 깨끗한 눈과 단아한 얼굴형, 오똑한 콧날과 새초롬한 입술, 여기에다 청순하고 우아한 이미지까지. 동료 여자 연예인들 사이에서도 부러움의 대상이 되는 그녀만의 건강 스타일을 알아보자.

• Nuclear industry
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• v.8 no.10 s.68
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• pp.62-64
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• 1988

일본원자력산업회의가 조사한 금년 상반기의 세계 원자력발전 개발동향에 의하면 12기, 시설용량 1,389만4천kW가 신규로 운전개시하여 1988년 6월 30일 현재 전세계에서 운전중인 원자력발전소는 410기, 3억1,562만4천kW에 달하는 것으로 밝혀졌다.