• Asian-Australasian Journal of Animal Sciences
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• 제2권3호
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• pp.325-326
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• 1989

• 한국축산시설환경학회지
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• 제21권3호
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• pp.77-82
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• 2015

This survey was conducted to collect basic data about the effect of buffering zone installation in weaned pig house. Buffering zone was installed either inside or outside of pig house to compare changes of temperature, humidity and air velocity of pig room. The body weight and mortality of weaned pigs in house with buffering zone was also measured. There was no difference in temperature, humidity and air velocity between inside and outside buffering zone. Mortality of weaned pig in house with buffering zone was drastically decreased compare to pigs in house without buffering zone that could be useful to maintain constant temperature and decrease mortality.

• 한국물환경학회지
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• 제25권6호
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• pp.910-915
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• 2009

The ecohydrologic characteristics according to planting in riparian zone for the riparian restoration are analyzed in this research. The ecohydrologic components due to land use change in riparian zone from existing land cover to planted area such as pasture and wildrye are simulated in the test basin with the integrated SWAT-MODFLOW model. After analysis of change of the hydrologic properties such as surface flow, lateral flow, transpiration and soil water in riparian zone, it is revealed that soil water is one of the key factors and planting of wildrye can increase soil water in riparian zone. The simulation performance of the SWAT-MODFLOW model is validated in this study and it is expected that this model can be used to evaluate various riparian restoration scenarios.

• Ocean Systems Engineering
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• 제2권1호
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• pp.33-47
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• 2012

This study revealed the behavior of droplets formed through leak process in deep water. There was a threshold depth named the universal attraction depth (UAD). Droplets rose upward in the zone below the UAD called the rising zone, and settled down in the zone above the UAD called the settling zone. Three mass loss modes were identified and formulated: dissolution induced by mass transfer, condensation by heat transfer and phase separation by pressure decrease. The first two were active for the settling zone, and all the three were effective for the rising zone. In consequence, the life time of the droplets in the rising zone was far shorter than that of the droplets in the settling zone.

• Asian-Australasian Journal of Animal Sciences
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• 제28권7호
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• pp.943-950
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• 2015

Heat stress has adverse effects on fertility of dairy animals. Decline in fertility is linearly associated with an increase in combination of both temperature and humidity. The purpose of this study was to investigate the relationship between temperature humidity index (THI) and the pregnancy rate of Murrah buffaloes in a subtropical climate. The effects of genetic and non-genetic factors viz., sire, parity, period of calving and age group at first calving were found non-significant on pregnancy rate. The effect of THI was found significant (p<0.001) on pregnancy rate of Murrah buffaloes calved for first time and overall pregnancy rate. The threshold THI affecting the pregnancy rate was identified as THI 75. The months from October to March showed THI<75 and considered as non heat stress zone (NHSZ), while months from April to September were determined as heat stress zone (HSZ) with $THI{\geq}75$. The lowest overall pregnancy rate (0.25) was obtained in July with THI 80.9, while the highest overall pregnancy rate (0.59) was found in November with THI 66.1. May and June were identified as critical heat stress zone (CHSZ) within the HSZ with maximum decline (-7%) in pregnancy rate with per unit increase in THI. The highest overall pregnancy rate was estimated as 0.45 in NHSZ with THI value 56.7 to 73.2. The pregnancy rate was found to have declined to 0.28 in HSZ with THI 73.5 to 83.7. However, the lowest pregnancy rate was estimated as 0.27 in CHSZ with THI value 80.3 to 81.6.

• 대한환경공학회지
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• 제35권12호
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• pp.953-959
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• 2013

본 연구는 도시 인공호수에서 서식하는 큰입배스 위 내용물 분석을 통해 먹이 다양성에 따른 성장 특성과 수생동물 군집 특성을 조사하였으며 대상호수는 국내에서 가장 큰 도시 인공호수 중 하나인 일산호수에 대하여 실시하였다. 큰입배스의 길이와 무게의 관계에 따라 Zone III(생태 구역)에서의 체중증가속도가 다른 Zone보다 더 빠른 것으로 나타났다. 어류 총 16종 및 9종이 각각 Zone III 및 Zone I, II(인공 구역)에서 관찰되어 Zone III의 어류의 종다양성이 Zone I, II에 비해 높았다. 상대중요성지수(IRI)는 Zone III에서 Zone I, II에 비해 더 다양하였으며, 공복율을 고려할 때 먹이 스트레스는 Zone I, II에서 더 심각한 것으로 나타났다. 어류의 군집분석 결과, 피라미 Zacco platypus가 우점종인 것으로 나타났고, 긴몰개 Squalidus gracilis majimae와 밀어 Rhinogobius brunneus는 Zone III에서만 풍부하게 발견되었다. Zone I, II에서 나타난 먹이종의 낮은 다양성을 고려할 때, 소금쟁이류 Heteroptera와 같은 절지동물문은 Zone I, II에서 Zone III에 비해 큰입배스의 위 속에서 상대적으로 높은 비율로 관찰되었다. 본 연구에 의해 큰입배스의 위 내용물 분석과 같은 간접적인 평가에 의해 수생동물 군집의 특성을 파악하는 것이 가능한 것으로 나타났다.

• 한국수산과학회지
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• 제48권5호
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• pp.760-767
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• 2015

First annulus formation and age determination of otoliths were examined for chub mackerel Scomber japonicus collected in Korean waters over the one year from January to December in 2009. Translucent zone was regarded as an annual mark. Age interpretation criteria was based on the data of the number of translucent zone, capture date, and edge type of the otolith, assuming the nominal birthday to be 1 January. Monthly changes in mean marginal index indicated that translucent zone was formed once a year, mainly in June. The otolith of 0-ring group was detected comparing the progression by month of the smaller fish length, appearing to be a single first opaque zone. The average distance from the core to the first translucent zone was ~1.77 mm, provided as supplementary information to increase ageing accuracy. The ageing criteria for chub mackerel was made to determine correct year-class with the purpose of effective stock assessment. This method using nominal birthdate and edge type analysis could estimate age of fish closer to the true age than purely counting the number of translucent zone on a whole otolith.

• 해양환경안전학회지
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• 제22권6호
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• pp.738-749
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• 2016

낙동강 상류지역 건설사업 이후, 식물플랑크톤의 시 공간 분포특성을 파악하기 위해 2013년 2월부터 2015년 12월까지 낙동강 하구둑에서 가덕도 동편에 이르는 수역에서 격월로 환경요인과 식물플랑크톤을 조사하였다. 환경요인은 연간 유의한 차이를 보이지 않았으나, 상 하부수역 및 계절적 차이가 나타났다. 상부수역은 돌말류, 녹조류, 남조류가 하부수역보다 높았고, 특히 담수돌말류와 남조류가 우점하였다. 반면 하부수역은 와편모류가 주로 출현하였다. 상관분석 결과, 상부수역은 Stephanodiscus spp., Asterionellopsis formosa, Microcystis spp.가 주로 담수방류에 의한 인위적인 유입과 관련성이 나타났다. 우점종과 상관관계가 나타난 환경요인은 수온, 풍속, DIP, DIN 등으로 나타났다. 하부수역에서 상위종으로 출현한 와편모류는 대부분 영양염류 및 바람과 상관성이 나타났다. 특히 하부수역에서 Prorocentrum donghaiense은 DIN, 풍속, 강풍발생 일수와 음의 상관성이 나타났고, 하계시기에 집중적으로 출현한다. 유사도와 PCA분석에서도 상부수역은 시기적인 구분이 뚜렷하지 않은 반면 하부수역에서는 계절적인 차이가 발생하였다. 하부수역은 2014년 일부시기를 제외하고, 크게 와편모류가 증가하는 6-8월과 돌말류가 우점하는 10-4월로 구분되었다. 이는 지리적 특성에 의한 담수 방류의 영향범위 차이가 담수종과 영양염류의 유입을 변화시켜 식물플랑크톤 군집특성에 영향을 미치고 있음을 의미한다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.768-776
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• 2006

Recently in spite of Development of Investigation machine, in Application of Geotechnical Properties by empirical recommendation to the Slope Stability Analysis. It is generally Application of convenience and conservative Geotechnical Properties by Borehole Shear Test(BST) in Representative Zone that Non-Division of Increase as the depth of Strength Parameters In Deep Weathered Zone. Therefore, it is become environment pollution and Non-Economical Slope Design to Application of convenience and conservative Geotechnical Properties. The production mechanism of Deep Weathered Zone is tend to Weathering Degree low and Strength increase by increase as the depth. it is realistic design that Division of Deep Weathered Zone and application Geotechnical Properties of Each Layer. In this Paper, Determined The Relationship of Strength Parameters between Standard Penetration Test(SPT), Borehole Shear Test(BST) and empirical recommendation also Applyed each strength parameters of divided zone to the Slope Stability Analysis by continuous Borehole Shear Test(BST) in Deep Weathered Zone during design of The 2nd Bridge Connection Road of Incheon International Airport.

• Journal of Welding and Joining
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• 제31권5호
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• pp.41-46
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• 2013

Different microstructures in the weld zone of a metal structure such as a fusion zone or heat affected zone are formed as compared to the parent material. Thus, the mechanical properties in the weld zone are different from those in the parent material. As the basic data for reliably understanding the structural characteristics of a welded PCHE specimen to be made of Alloy 617, the mechanical properties in the weld zone and parent material for a Alloy 617 plate are measured using an instrumented indentation technique in this study.