• 한국분말재료학회지
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• 제12권1호
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• pp.51-55
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• 2005

$Cu_2O$ nano cubes with high catalase activity were synthesized by reduction of freshly prepared Cu in distilled water at $40^{\circC}$ and their catalase activities of $H_2O_2$ were studied. Transmission electron microscopy (TEM) observation showed that most of these nanocubes were uniform in size, with the average edge length of 30 nm. Selected area electron diffraction of TEM revealed that the nanocube consisted of single crystalline $Cu_2O$, but it changed to CuO phase. The catalase activity depends on the amount of both cuprite phase and surface area.

• 한국동물위생학회지
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• 제36권2호
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• pp.147-150
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• 2013

This study was carried out to investigate the prevalence of honeybee (Apis mellifera) disease in cheonan and asan area. From September to November in 2012, 33 samples were collected from 33 apiculture farms in the regions and reverse transcriptase-polymerase chain reaction (RT-PCR) and polymerase chain reaction (PCR) was conducted. Among 33 samples, prevalence rate was 42% in Sac Brood Virus (SBV), 52% in Nosema, 21% in American foulbrood (AFB), 70% in European foulbrood (EFB), 97% in Stonebrood, 3% in Chalkbrood. The result indicate that stonebrood was most prevalent disease in apiculture farms in cheonan and asan area.

• 한국환경보건학회지
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• 제30권2호
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• pp.123-132
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• 2004

The purpose of this study was to characterize background mass concentration of PM$_{10}$ and metallic composition from September 2001 to August 2002 in comparison with Asan and Seoul. Annual mean of PM$_{10}$ concentrations in Asan and Seoul were 47.98 and 75.33$\mu\textrm{g}$/㎥, respectively. The concentrations of PM$_{10}$ were highest in spring season in both cities. The concentrations of measured metals except for As and Pb in Asan were higher than those in Seoul. Yellow dust could affect the mass and metals concentrations of measured PM$_{10}$ in Asan and Seoul. Relationship between measured metals concentrations showed that Si and Fe were associated with natural sources such as soil. Pb, Cu and Zn were closely related to urban anthropogenic sources such as fuel combustion. Especially, relationship between metals showed different association during yellow dust. Proper management for PM$_{10}$ will need in Asan, considered the concentrations of metallic elements in PM$_{10}$ in Asan were relatively higher than those in Seoul.se in Seoul.

• 한국항해학회지
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• 제18권2호
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• pp.41-56
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• 1994

This paper was a part of the risk management in planning a channel. It utilized Korea Marine Training & Research Institutes(KMTRI) which Houses a real-time, full-mission shiphandling simulator to examine the safety of the ship's transit in the planned channel of Asan port. 6 competent Captains participated in this study. The vessel modelled was a 60,000-ton ship. The two variables(factors) examined were environ-mental conditions such as flood-and-ebb current condition and day-and-night condition. The two variables were combined to produce four experimental conditions. To evaluate the safety of the environmental conditions, two categories of performance measures were analyzed. They were vessel's proximity to channel boundary and vessel controalbility. The findings regar-ding the effects of environmental conditions were as follows : - Closest Point of Approach(CPA) to channel boundary was enough for 60,000-ton ship to transit th-rough the channel with 99.999% confidence level. - Closest Point of Approach(CPA) to channel boundary further was under against-current condition than under with-current condition. -Vessel controlability was better under against-current condition than under with-current condition. -Vessel controlability was better under inbound transit than under outbound transit.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.166-168
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• 2003

전력계통의 안정운용을 위하여 대용량 발전소와 주요 345kV 전력소로부터 시각 동기화된 계통 운전자료를 온라인으로 취득하여 계통 안정성을 실시간으로 감시, 분석할 수 있는 전력계통 온라인 안정성 감시, 분석시스템을 개발하였다. 전력계통 온라인 안정성 감시, 분석시스템은 크게 Master 시스템과 Local 시스템으로 구성된다. Local 시스템은 시각동기 데이터 취득시스템(TSDS)이라고도 하는데, GPS를 이용한 시각 동기화된 계통 운전데이터를 측정하고, 지역사고 판단 및 사고데이터를 기록하며, 측정/기록데이터를 Master 시스템으로 온라인 전송해주는 역할을 한다. Master 시스템은 각 Local 시스템에서 전송되어진 측정/기록데이터를 수집하고, 광역사고 판단 및 사고데이터를 기록하며, 과도안정도를 온라인으로 평가해주는 역할은 한다. 현재 1단계 연구결과로서 울진, 영광, 고리 원자력발전소와 동서울,신제천,청양,아산,신옥천 전력소 등 총 8개소에 Local 시스템 설치 및 시운전이 완료되었고, 한국전력거래소(KPX)에 설치된 Master 시스템을 이용하여 TSDS의 확대적용을 위한 활용성 검증작업을 진행하고 있다.

• 산업기술연구
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• 제18권
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• pp.425-430
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• 1998

The Asan Bay area Korea is situated in an unbalance or water supply and demand relating to the Ansung, Sapkyo, Dangjin and Youmwha rivers and their estuary reservoirs. The multi-reservoir operation was studied by the Hierarchical Operation Model for Multi-reservoir System(HOMMS) assuming that these four estuary reservoirs were linked to each other in order. The result of this study shows that storage capacity deficiency in 2011 was estimated as 8 MCM in the Sapkyo and 31 MCMin Dae Ho estuary reservoir, respectively. In case of linking four reservoirs, the water deficiency will not occurs in all the reservoirs even if additional agricultural water of 78 MCM/yr was supplied. Total additional water demand for agricultural, municipal and industrial uses was estimated as 321.9 MCM/yr while additional supply by linking the reservoirs was estimated as 160.4 MCM/yr. 50% of additional demand. The remaining 161.5MCM/yr would be supplied transferring other watershed.

• 보존과학연구
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• 통권23호
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• pp.59-75
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• 2002

In this study human bones and teeth, excavated from the Myeongam-risite in Asan, Chungcheongnam-do Province, have been analysed by nuclear DNA typing and mitochondrial DNA sequencing methods. Twenty-one samples of long bones and twenty-seven samples of teeth from twenty-one individuals were collected and analysed. Among these thirteenteeth were successfully subjected to nuclear DNA extraction, quantification, and PCR(Polymerase Chain Reaction) amplification. Silver STR III (D16S539, D7S820, D13S317) multiplex PCR method was used in this study for a short tandem repeat (STR) analysis. Mitochondrial DNAs of tooth samples were also amplified and sequenced by a DNA sequencer. These analyses show that a sample from Burial no. 29 and one from Burial no. 38(right) possessed the same maternal inheritance. This may suggest that the Myeongam-ri cemetery was used by a kin group for a relatively long period of time.

• 한국유기농업학회지
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• 제19권3호
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• pp.309-327
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• 2011

The paper analyzed on the level of consumer member's awareness to green marketing strategies (4P's; product, price, place and promotion strategies) of Hansalim specialty shops for environmentally friendly agri-products. For the study, Hansalim-Cheonanasan members had been surveyed. Consumers purchase environmentally friendly agri-products because quality and freshness of those is good. The difference in amount of the average monthly purchase between loyal customers and disloyal customers is about 130,000 won. And customer's awareness is that the first is promotion strategy, the second product strategy, the third place strategy, the last price strategy. The average monthly purchase is related with product strategy in correlations between the 4P's each other. If Hansalim maintains a product strategy, promotes extensively and keeps their product standard, more consumers will purchase Hansalim products because the most important one of effect of green marketing strategies on consumer behavior is products. Hansalim needs to go into action to increase recognition. Some of consumers have misconcepts or don't know about the 4P's well. If Hansalim promotes positively considering interrelationship about 4P's strategies or other strategies, the consumers awareness will be changed more effectively. This study shows that balanced 4P's is better than only one superior strategy because of the correlation amomg green marketing strategies.

• 한국정보통신학회논문지
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• 제12권3호
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• pp.575-580
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• 2008

최근 IPv4 주소의 고갈과 더블어 P2P 트래픽의 증가로 인해 NAT의 사용은 피할 수 없다. NAT 내부에 있는 서버는 외부의 릴레이 서버를 통해서만 접속이 이루어지는 속성을 가지고 있다. 따라서 NAT 외부에 있는 서버는 많은 자원을 소비하고 네트워크 트래픽을 증가시킨다. 본 논문에서는 NAT 외부에서 NAT 내부로의 세션을 형성 할 수 있고, NAT 외부의 릴레이 서버를 NAT 내부에 둠으로써 네트워크 트래픽을 감소시킬 수 있는 토폴로지를 제안한다.

• Animal Systematics, Evolution and Diversity
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• nspc2호
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• pp.13-24
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• 1988

충남 아산군을 중심으로 깔따구 성충을 채집 조사한 결과 총 15속 21종이 동정되었는데 그중에서 한국 미기록 2종과 3종을 확인하였다. 한국 미기록 종은 Polypedilum masudai(국명: 마쓰다무늬깔따구, 신칭)와 Pentapedilum un-cinatum(국명: 갈고리오각깔따구, 신칭)이고 3신종을 Pentapedilum pseudo-tritum(국명: 옆구리띠오각깔따구), cladotanytarsus sinjongensis(국명: 신정눈장부깔따구) 및 Rheotanytarsus dogoensis(국명 : 도고유장부깔따구)로 명명한다. 이로써, 한국산 깔따구류는 총 22속 36종이 된다.