• 대한환경공학회지
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• 제30권5호
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• pp.544-551
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• 2008

QUAL2K는 QUAL2E 모델의 단점을 개선하고 편의성을 향상시킨 모델로 입자성 유기물, 부착조류, 탈질화 및 퇴적층-수체 상호작용 등을 추가 반영하였으며, CBOD는 느린 CBOD와 빠른 CBOD 두 가지로 구분하여 현실화 하였다. QUAL2E와 QUAL2K 모델을 안양천에 적용하여 DO, BOD, Org-N, NH$_3$-N, NO$_3$-N, Org-P, Dis-P 및 Chl-a 등 8개 수질항목을 모의하여 결과를 비교 분석하였다. Org-N, NH$_3$-N, Org-P 및 Chl-a는 두 모델에서 비슷한 결과가 나타났으나, DO, BOD, NO$_3$-N 및 Dis-P는 다른 결과가 나타났다. 이는 QUAL2K에 추가된 부착조류, 탈질화, 퇴적층-수체의 상호작용 및 입자성 유기물의 영향에 기인한 것으로 판단된다. DO는 부착조류의 영향으로 낮게 나타났고, BOD는 입자성 유기물의 영향으로 높게 나타났다. NO3-N은 퇴적층-수체의 상호작용과 탈질화의 영향으로 실측치에 더 가깝게 나타났다. 모의 결과를 단순통계인자를 이용하여 평가하였으며, 대부분 수질항목에서 상대오차와 분산계수가 QUAL2E보다 QUAL2K에서 작게 나타났다. 자연현상을 좀더 실제에 가깝게 모의할 수 있는 QUAL2K 모델은 하천 및 하천화한 호소 수질관리에 적절히 이용할 수 있을 것으로 판단된다.

• 생약학회지
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• 제27권2호
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• pp.129-135
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• 1996

Euphorbia ebracteolata Hayata is a perennial herb of Euphorbiaceae that has a cyathumal inflorescence, the glands of the involucres are rounded-cordate and reddish, stems are erect, thick and 40-50 cm high. The leaves are alternate and rather numerous. So far this plant has been known as a unreported species in Korea. However, as the result of this study, this plant was found to be widely distributed in Korea over eight habitats, i.e. Keunduk, Dokye and Kaliwangsan, Kangwon-do: Dunduksan, Kyongsangbuk-do: Okcheon, Chungcheongbuk-do: Manduksan, Baekyangsan and Naejangsan, Jeolanam-do. On the other hand, its variety, E. ebracteolata var. coreana Hurusawa which grows only in Poong-do, Kyongki-do was reviewed by comparative morphology and chemotaxonomy to be resulted in the same species, E. ebracteolata.

• Journal of Species Research
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• 제9권4호
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• pp.489-491
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• 2020

An yponomeutid genus Eumonopyta Moriuti, 1977 is recorded for the first time from Korea, based on the species Eumonopyta unicornis Moriuti, 1977. Eumonopyta is distinguished from Yponomeuta by the lack of the areole in the forewing, the presence of the hindwing veins, Sc and R₁ completely fused, the lack of the spinules on the gnathal processes, and the presence of three spiniform cornuti in the phallus. Eumonopyta unicornis is characterized by the presence of greenish irrotation on the forewings. The Korean records of E. unicornis are based on two male specimens from the islands, Geojedo (Gyeongsangnam-do) and Jejudo (Jeju-do) and one female specimen from the island Dolsando (Jeollanam-do). External appearance and genitalia of E. unicornis are redescribed and illustrated. The occurrence status of E. unicornis in Korea is briefly discussed. With our records from Korea, the distributional range of E. unicornis is expanded from Japan and Taiwan.

• 통상정보연구
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• 제7권2호
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• pp.115-137
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• 2005

E-trade is important that SMEs can do international business with activity. However, SMEs are facing psychological and economic barriers to e-trade. Therefore, SMEs depend on intermediaries for e-trading. In this context, APEC carried out the APEC Global B2B Interoperability Project to promote e-trade and increase benefits for member countries from 2002 to 2004. Especially this project emphasizes a collaboration with e-marketplaces. It has significance in that it is a new model to help SMEs do international trade. This study analyzes the APEC project in terms of technology and business and evaluates the project as a collaborative business model.

• 한국식품위생안전성학회지
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• 제23권2호
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• pp.157-162
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• 2008

열수(Hot water)를 이용 조제분유 및 선식 준비 시 살균효과를 실험한 결과 $60^{\circ}C$ 이상에서 살균 효과를 나타내었으나 조제분유와 선식에 열수를 가하였을 때 발생하는 온도 저하와 조제분유 및 선식 등의 분말 식품에서 biofilm을 생산하여 내열성이 증가되는 E. sakazakii의 특성을 고려하여 $70^{\circ}C$ 이상의 열수로 조제분유 및 선식 등을 용해하여야 할 것으로 판단된다. 마이크로웨이브를 이용 E. sakazakii의 살균 효과를 실험한 결과 E. sakazakii를 제어하기 위하여 100 mL의 경우 90초 이상 가열하거나 온도측정이 곤란한 경우에는 최초 끓는 시점까지 가열한 후 냉각하여 섭취하여야할 것으로 조사되었다. 용해된 조제분유 및 선식의 저장 안정성을 평가하기 위해 $5{\sim}35^{\circ}C$에 48시간 동안 보관하며 E. sakazakii의 성장곡선을 실험한 결과 $5^{\circ}C$, $10^{\circ}C$ 냉장온도에서는 48시간까지 증식이 미약하였다. 그러나 냉장 온도에서 사멸하지 않고 미약하게 증식하는 E. sakazakii의 특성을 고려하여 조제분유 및 선식의 냉장 보관은 24시간 이내로 제한하여 섭취하여야 할 것으로 판단된다.

• 한국식품위생안전성학회지
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• 제24권4호
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• pp.307-311
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• 2009

The objectives of this study were to compare the biochemical profiles with biogroups for the identification of Cronobacter spp. (formally known as Enterobacter sakazakii) isolates using biochemical identification kits. A total of 38 Cronobacter spp. contained 5 clinical, 31 food, and 2 environmental isolates were used. All isolates were identified as Cronobacter spp. with the Vitek II system and ID 32E kit. The API 20E kit identified all isolates as Cronobacter spp. but the percentage identification was 51.1% for 16 of 38 isolates. These strains were contained to Biogroup 2, 9, 10, and 11. The utilization of inositol is a factor determining the percentage identification of Cronobacter spp. with the API 20E kit.

• 한국자동차공학회논문집
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• 제17권5호
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• pp.16-25
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• 2009

Testing engine performance using an engine dynamometer requires high technical researchers and many facilities. Nowadays, different variables of CAE program are used for identifying the engine performance instead of engine dynamometer test. This is more convenience, as it does not necessitate an abundance of engine dynamometer experiments and, in addition, produces better results. However, CAE programs also contain various variables which can affect engine performance. Those are coupled with each other, thus making it difficult to determine the effectiveness of different variables on engines. DoE (Design of Experiments) methodology is an efficient way to verify the magnitude of effectiveness on engine performance as well as making responses to be optimized at once without trial & error. This study used data from WAVE simulations, which modeled the DOHC SI engine with in-line 4 cylinders at 1500, 3000 and 4500rpm. DoE methodology is designed properly to determine the effectiveness of five variables on power, BSFC, and volumetric efficiency, as well as to find the optimal response conditions at each rpm through a minimized number of experiments. After finishing DoE process, all the results are examined concerning the reliability of test through a verification experiment.

• Parasites, Hosts and Diseases
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• 제52권5호
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• pp.507-511
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• 2014

Outbreaks of tick-borne disease cases in Santa Catarina, Brazil are known, but the presence of the pathogen DNA has never been determined. In this study, the first survey of Anaplasma marginale, Babesia bigemina, and Babesia bovis DNA on blood samples of 33 cattle from an outbreak in Ponte Alta Municipality, Santa Catarina, Brazil, has been carried out. A multiplex PCR detected 54.5% of animals were co-infected with 2 or 3 parasites, while 24.2% were infected with only 1 species. The most prevalent agent was B. bigemina (63.6%) followed by A. marginale (60.6%). This is the first report of tick-borne disease pathogens obtained by DNA analysis in Southern Brazil.

• 물과 미래
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• 제26권3호
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• pp.75-85
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• 1993

본 연구에서는 QUAL2E 모형의 계산구간을 유입지점마다 분할하여 정하고, 계산에 피룡한 수문인자들 및 수질자료를 가능한한 실측치나 또는 직접계산치로 사용했다. 대상하천은 미국 Clorado 주의 South Platte 강을 선정하고, 수질항목 용존산소(DO)와 생물학적 산소요구량(CBOD5)에 대하여 1991년 9월과 1992년 1월 자료를 사용하여 계산하고 관측치와 비교한바, DO는 5%이내, CBOD5는 20% 정도에서 잘 일치하였다. 수질예측결과에 의하면 2001년에는 대상하천의 수질이 미환경청 기준으로 4등급수에 해당되는 것으로 나타났다.

• 한국물환경학회지
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• 제22권1호
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• pp.66-73
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• 2006

The purpose of this study was done to evaluate degradation characteristics of non-biodegradable organic matters including aromatic compounds in livestock wastewater using CFZ process. The CFZ process is consisted of coagulation/sedimentation, Fenton oxidation and zeolite adsoption process. degradation charateristics of each treatment water including livestock wastewater were analyzed by UV scanning, FT-IR and GC/MS. After coagulation/sedimentation process as 1st treatment, non-biodegradable matters remained after 1st treatment were removed by using OH radical produced in Fenton oxidation process. As a result of treatment using these processes, NBDCOD removal efficiency was over 90%. Increase of $E_2/E_3$ ratio (absorbance at 250 and 365 nm) in each treatment water means that aromaticity of livestock wastewater decreased. In case of GC/MS, most aromatics or polynuclear aromatics like benzene, phenol and scatol in livestock wastewater almost wasn't detected after oxidation using OH radical.