• 항공우주기술
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• 제9권2호
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• pp.185-192
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• 2010

75톤급 터보펌프를 대상으로 한 속도복합형 터빈과 설계회전수를 50% 증가시킨 30톤급 터보펌프 터빈 적용을 위한을 압력복합형 터빈 설계를 수행하였다. 속도복합형 터빈의 경우 1차원설계-유동해석-1차원설계의 반복적인 설계과정을 통해 원형노즐을 적용한 2열 초음속 충동터빈의 특성을 파악하였으며 최종적으로 기본형인 1열 충동형 터빈 대비 비출력 23.1% 향상, 무게 5% 감소된 ver. 14h 모델을 완성하였다. 압력복합형 터빈은 에너지 회수 비율, 2단 노즐 출구각, 2단 노즐 누설유량, 단별 출력 비율 등의 새로운 인자의 고려하여 각 변수의 성능에 미치는 영향을 검토하였으며 1차원 해석 기준 비출력이 36%가 증대되고 무게는 51% 감소한 터빈을 설계하였다. 압력복합형 터빈의 높은 성능을 위해서는 1단 및 2단 노즐의 형상설계가 매우 중요할 것으로 판단되며 유동해석을 통해 최적화할 예정이다.

• 대한물리치료과학회지
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• 제10권2호
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• pp.29-36
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• 2003

The purpose of this study was to investigate the effects of height of shoe lifts on gait and balance in hemiplegic patients. Twenty-two hemiplegic patients who were receiving rehabilitation treatment at Hanyang University Seoul Hospital and National Rehabilitation Center participated in this study from November 8, 2002 through March 20, 2003. Data analysis using repeated measures ANOVA and Bonferroni method, for a post-test. The results of this study were as follows : First, shoe lift on the height of 3mm, 6mm, 9mm, 12mm significantly improved, as compared to un-lift status, in gait velocity, PCI, weight bearing(p<0.05). Second, gait velocity was significantly difference between 3mm and 9mm, and between 3mm and 12mm, and weight bearing on the affected side was significantly difference between 3mm and 12mm, and between 6mm and 12mm(p<0.05). Third, after the shoe lift removed was significantly improved in gait velocity, PCI, weight bearing than before shoe lifts being added(p<0.05). These results suggest that shoe lift on the unaffected side may helpful for improving the gait efficiency and symmetrically of weight bearing. Furthermore, persistence of gait efficiency and symmetrically of weight bearing after removing the shoe lift suggests carryover effect of gait training on shoe lift of unaffected side.

• 한국전문물리치료학회지
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• 제21권2호
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• pp.57-66
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• 2014

The objective of this study was to determine the duration of maintained calf muscle flexibility gained in young adults with calf muscle tightness, as measured by increases in ankle active and passive dorsiflexion range of motion (DFROM) after three stretching interventions. Twenty subjects (5 men and 15 women) with calf muscle tightness received the following three stretching interventions in one leg (assigned at random): static stretching (SS), eccentric training on stable surface (ETS), and eccentric training on unstable surfaces (ETU). The subjects received all three interventions to the same leg, applied in a random order. Each intervention had a break of at least 24 h in-between, in order to minimize any carryover effect. Each intervention used two types of stretching: with the calf muscle stretched and both knees straight, and with the knee slightly bent in order to maximize the activation of the soleus muscle. All three interventions were performed for 200 seconds. We measured the duration of maintained calf muscle flexibility through active and passive ankle DFROM before intervention, immediately after intervention (time 0), and then 3, 6, 9, 15, and 30 min after intervention. We found a difference in the duration of maintained calf muscle flexibility between the three interventions. In the ETS and ETU interventions, a significant improvement in calf muscle flexibility, both ankle active and passive dorsiflexion ranges of motion (ADFROM and PDFROM), was maintained for 30 min. In the SS intervention, however, ADFROM before 9 min and PDFROM before 6 min were statistically different from the baseline. Our results suggest that ETS and ETU may be more effective than SS for maintaining calf muscle flexibility in young adults.

• 분석과학
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• 제34권6호
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• pp.259-266
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• 2021

대마는 전 세계적으로 가장 많이 남용되고 있는 물질 중의 하나이며, 우리나라에서는 메트암페타민 다음으로 많이 남용되고 있으며, 1976년부터 국내에서 마약류관리법에 의해 규제되고 있다. 소변 중 대마성분의 검출을 위하여는 대마의 유효 성분인 Δ⁹-tetrahydrocannabinol (THC)의 생체내 주된 대사체인 11-nor-Δ⁹-carboxy-tetrahydrocannabinol (THCCOOH)을 확인하는 것이 일반적이며, 이는 과학수사 및 사법처리와 관련된 법과학 분야에서 중요한 증거로 받아들여지고 있다. 본 연구에서는 소변 중 대마 대사체의 분석을 위하여 분석법이 간단하고 단시간이 소요되는 분석방법으로 THCCOOH 및 THCCOOH-glucuronide를 액상 추출하고 액체크로마토그라피/질량분석법(LC-MS/MS)을 사용하여 동시 분석하는 방법을 확립하였다. 내부표준물질로는 THCCOOH-D₃ 및 THCCOOH-glucuronide-D₃를 사용하였다. 시험방법의 유효화를 위하여 매질 효과, 회수율, 직선성, 정밀도, 정확도, 시험과정의 효율성 및 안정성 등을 시험하였고, 모든 결과가 적합함을 알 수 있었다. 실험 과정에서의 carryover는 나타나지 않았으며, 선택성 및 간섭성도 우수하였다. THCCOOH 및 THCCOOH-glucuronide의 검출 한계는 각각 0.3 및 0.2 ng/mL 이었다. 확립된 분석방법을 면역시험법과 가스크로마토그라피/질량분석법(GC/MS)법에서 대마 양성으로 최종 판정된 28개의 실제 소변에 적용하여 분석법의 적합성을 검토하였다. 28개 소변 중 THCCOOH 및 THCCOOH-glucuronide의 농도는 각각 정량 한계 미만~226.90 ng/mL 및 6.43~2133.03 ng/mL이었고, 모든 시료에서 THCCOOH-glucuronide가 THCCOOH 보다 많이 검출되었다. 본 분석법을 소변 중 대마의 흡연여부를 판정하는 감정시험에 적용함으로써 단시간에 효율적인 분석을 실시할 수 있게 되어 과학수사 발전에 기여할 수 있을 것으로 사료된다.

• 대한한방내과학회지
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• 제28권3호
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• pp.492-501
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• 2007

Objectives : This study was executed in order to evaluate the effects of electroacupuncture on upper-extremity spasticity control in stroke patients. Methods : Eighteen patients with stroke were enrolled and classified into two groups, the study and control group. The control group did not receive any oriental medical treatment. In the study group, the electroacupuncture points were applied to Kokt'aek (PC3) and $Ch'{\u{o}}ch'{\u{o}}n$ (PC2), Naegwan (PC6) and $Ch'{\u{o}}kt'aek$(LU5) of the affected limb. H-reflexl M-response ratio (HIM ratio), modified Ashworth scale (MAS) and Fugl-Meyer motor function assessment (FMA) were used for evaluation of spasticity control before electroacupuncture, within two hours after electroacupuncture, and at two weeks. Results : In MAS, the study group declined more than the control group. but there was no statisticallysignificant consideration. In H/M ratio. the study group was more efficient than the control group. and spasticity decreased successively during the series in the study group. In FMA, motor function in the study group improved more than in the control group and motor function in the study group increased successively during the series. Conclusions : These results showed that electro acupuncture was a useful method to decrease upper-extremity spasticity in patients with stroke. Further studies are needed to explore more cases and the long-lasting carryover effects on upper-extremity spasticity in electroacupuncture.