• 전기전자학회논문지
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• 제1권1호
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• pp.164-175
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• 1997

본 논문에서는 PSK 를 비선형증폭기에 적용하여 전력효율을 개선하고자 등포락선을 갖는 CE-OQPSK 를 설계하였다. 이의 실현을 위해서 비교적 전력소모가 적은 ROM 과 D/A 변환기를 사용하였다. CE-OQPSK의 전력스팩트럼밀도를 기존의 OQPSK 와 비교한 결과 등포락선을 만들기 위한 계수 ${\alpha}$ =0.707 인 경우 주로브와 부로브에서 각각 최대 5% 와 20%의 대역효율의 개선을 보였으며 여기에 대역제한 필터를 부가하였을 경우 설계기준으로 설정한 FCC 무선 LAN 규격을 만족함을 보였다.

• 대한수의학회지
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• 제50권3호
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• pp.253-257
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• 2010

A 3-year-old female Thoroughbred racehorse was presented following the accidental oral and skin administration of amitraz. This case report describes the clinical signs and the treatment of this horse. Clinical signs of amitraz toxicosis are associated with the stimulation of alpha2-adrenergic receptors. Amitraz is seldom fatal because the effects can be reversed by alpha2-adrenergic antagonists. The horse displayed typical clinical signs of colic, including pawing, small hard drops, tranquillisation, depression, ataxia, muscular incoordination and impaction colic lasting up to 7 days. The syndrome was accompanied by mild dehydration. The horse survived after persistent symptomatic treatment, including the giving of intravenous fluids, antibiotics, multiple doses of mineral oil per os, nonsteroidal anti-inflammatory drugs and dexamethasone intramuscularly and intravenously.

• 대한관절경학회지
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• 제2권2호
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• pp.181-184
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• 1998

저자들은 생체 분해성 Meniscus Arrow$^{(R)}$를 이용한 반월상 연골 봉합술후에 발생한 비세균성 활액막염을 최초로 경험하였다. 따라서 향후 Meniscus Arrow$^{(R)}$를 이용한 반월상 연골 봉합술 후에 활액막염이 발생할 수 있음을 고려하여야 하며, 이 경우에서 활액막 절제술로 좋은 결과를 얻을 수 있었기에 문헌과 함께 보고하는 바이다.

• The Korean Journal of Pain
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• 제7권2호
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• pp.282-286
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• 1994

The central antihypertensive agent clonidine is an ${\alpha}_2$-adrenergic agonist that possesses pain-relieving properties. It has been administered epidurally in the treatment of cancer pain and for postoperative analgesia. 1) Case 1, 62-year-old woman who suffered from neurogenic pain syndrome due to metastatic squamous cell carcinoma of spinal canal was treated. 2) Case 2, 51-year-old woman undergoing lower abdominal surgery, epidurally administered morphine did not produced postoperative analgesia. In these cases, continuous epidural administeration of clonidine (200ug/day) and 0.3% bupivacaine(12 ml/day) produce high quality pain relief. These results suggest that antinociceptive effect of epidural clonidine is assumed to result from activation of ${\alpha}_2$-adrenergic receptors in the dorsal horn of the spinal cord.

• 동력기계공학회지
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• 제9권1호
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• pp.70-75
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• 2005

The damping property of Fe-12Cr-22Mn-X alloys has been investigated to develop high damping and high strength alloy. Particularly, the effect of the phase of austenite, alpha and epsilon martensite, which constitute the structure of the alloys Fe-12Cr-22Mn-X alloys, on the damping capacity at room temperature has been investigated. Various fraction of these phases were formed depending on the alloy element and cold work degree. The damping capacity is strongly affected by ${\varepsilon}$ martensite while the other phase, such as ${\alpha}'$ martensite, actually exhibit little effect on damping capacity. In case of Fe-12Cr-22Mn-3Co alloy, the large volume fraction of ${\varepsilon}$ martensite formed at about 30% cold rolling, and in case of Fe-12Cr-22Mn-1Ti alloy, formed at about 20% cold rolling and showed the highest damping capacity. Damping capacity showed higher value in Fe-12Cr-22Mn-1Ti alloy than one in Fe-12Cr-22Mn-3Co alloy.

• 대한기계학회논문집B
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• 제31권11호
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• pp.957-962
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• 2007

The flow around a rotating circular cylinder near a plane wall is investigated by the measurement of the lift acting on the cylinder and by the flow visualization using the hydrogen bubble technique in the circulating water tank. The experimental parameters are the rotating direction of the cylinder, the space ratios H/D($H/D=0.05{\sim}0.5$) between cylinder and plane wall and the velocity ratios ${\alpha}({\alpha}=0{\sim}{\pm}2.0)$. In the case of clockwise, the lift on the rotating circular cylinder was increased with the reduction of the space ratios and with the velocity ratios, the upper separation point was more shifted in the rotating direction with them. In the case of anticlockwise, the absolute value of the lift on the rotating circular cylinder was increased with the space ratios and with the velocity ratios, the lower separation point was more shifted in the rotating direction with them.

• 방사성폐기물학회지
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• 제2권3호
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• pp.155-164
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• 2004

사용후핵연료의 효율적인 관리를 위하여 원자력연구소에서 개발중인 사용후핵연료 차세대관리 종합공정(ACP)은 공정타당성연구 단계를 마치고 이의 실증을 위한 $\alpha$-${\gamma}$ type핫셀 건설 단계에 이르렀다. 핫셀의 설계에 앞서 사용후핵 연료를 취급하게 되는 과정에서 발생할 수 있는 방사능에 대한 환경영향평가를 정상운전 시와 사고발생 시로 나누어 수행하였다. 평가에 필요한 자료들은 공정의 개념설계 보고서와 최근 연구소부지 기상 테이터 및 부지특성 자료를 바탕으로 하였으며 기존의 유사한 시설에 대한 평가방법을 참조하였다. 각 핵종별 발생량과 방출량을 계산하여 피폭선량을 계산하였으며 평가결과 원자력법관련 규제기준과 핫셀이 위치하게 되는 IMEF 건물의 안전성분석 기준보다 매우 안전한 결과를 얻어 시설 운영에 대한 안전성을 확보하였다.

• 한국동물위생학회지
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• 제34권1호
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• pp.31-35
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• 2011

This is a case report that 24 heads of cattle suddenly died without clinical signs in a Hanwoo farm. The cause of death was Clostridium perfringens enterotoxemia resulted from them with feeding leftover food. The clinical signs were observed just before the death; increase of heart rate, shallow and rapid respiration, amyostasia, spasm and so forth. In autopsy, blood coagulation disorder, a little abdominal inflation, hepatomegaly and different size of red spots, congestion hemorrhage and undercurrent of bloody exudation were observed in the entire parts of small and large intestines. C. perfringens were isolated from the substantive organs, and a unique fragment of 405bp C. perfringens was amplified by PCR. Therefore, this case was diagnosed as enterotoxemia caused by ${\alpha}$-toxin of C. perfringens A type.

• 미생물학회지
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• 제37권2호
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• pp.124-129
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• 2001

하수종말처리장의 처리효율에 미치는 염분의 영향을 알기 위하여 염분의 농도 변화에 따른 종속영양세균, 총세균 그리고 FISH 방법으로 세균 군집 구조를 파악하였다. 총세균수는 염분과 관계없이 큰 변화가 없었으나, 종속영양세균수와 군집구조는 염분에 따라 다르게 변화하였다. 염분이 1% 인 경우에는 대조구에 큰 변화가 없었으나, 염분이 2% 이상이 되면 종속영양세균과 Eubacteria의 비율이 줄어들고, 세균 군집도 큰 변화가 있었다. 특히 Proteobacteria $\alpha$-group, $\gamma$-group 및 Cytophaga-Flavobacterium group의 비율이 감소하였다. 염분이 증가하면, 종속영양세균수와 세균 군집이 변화하므로, 하수처리과정에서 염분이 유입될 경우에는 염분을 1% 이하로 유지하여야 한다.

• 산업경영시스템학회지
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• 제30권4호
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• pp.71-77
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• 2007

In this study, reactions of central nervous systems working against different conditions of forced frequency and acceleration were measured and analyzed. The experiment are conducted with health men. The steady vibration conditions of forced frequency (0.315m/s2-1.0Hz, 0.315m/s2-10Hz and 10Hz-1.0m/s2) are used and the waves of EEG (Electroencephalogram) are measured. As a result, this paper shows that the ${\alpha}-wave$ of frontal lobe transfers from low to high frequency band under the vibration environment. Additionally, the average frequency of ${\alpha}-wave$ is higher under the vibration than under non-vibration environment. In the case of forced frequency of 1.0Hz-0.315m/s2, the feeling with the vibration are nearly same compared with the non-vibration condition. But in the case of 10Hz-1.0m/s2, uncomfortable feeling increased compared with the non-vibration condition. This study also shows the relationship between fluctuation slop and feeling. From this study, it is found that the effect of vibration on human depends on acceleration characteristics. Highly accelerating vibration is more harmful to human.