• 한방안이비인후피부과학회지
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• 제15권1호
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• pp.140-150
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• 2002

Introduction: Atopic dermatitis is chronic eczematous dermatosis which is related strongly to a family history of atopic disease and hereditary disposition. Its threshold of itching is low so that severe itching occurs and causes secondary eczema. Adult atopic dermatitis has mostly severe symptoms and progresses to chronic relapsing. Objective: The purpose of this study was to estimate the efficacy of oriental medical treatment and management on chronic adult atopic dermatitis. Subject: We studied 3 patients who visited Dongguk University Gangnam Oriental Hospital Dept. of Dermatol. with chronic adult atopic dermatitis from August 2001 to April 2002 and were observed for over 4 months. Methods: We treated them with herb-medication, acupuncture, negative therapy, aroma therapy, full spectrum visible ray therapy(by carbon arc) and external application(Jaun-go). We used the SCORAD index to assess the severity of atopic dermatitis. Results: There were 3 patients with chronic adult atopic dermatitis we could check for over 4 months by clinical scoring using the SCORAD system. 1. The grades of the severity of atopic dermatitis were lower only by the oriental medical treatments and management. 2. Intensities of relapse cases were lower then before the oriental medical treatments. 3. The secondary treatment term for relapse cases was shorter then the first treatment term after oriental remedies were used. Conclusion: Considering the above results, more study is needed on the chronic relapse cases with adult atopic dermatitis, the factors of increasing seventy of adult atopic dermatitis, the prognostic factors of adult atopic dermatitis, and the clinical interchange of chronic adult atopic dermatitis between oriental medicine and western medicine.

• Mycobiology
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• 제30권1호
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• pp.22-26
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• 2002

This study was carried out to investigate the possibility for seeds germination of Gastrodia elata using symbiotic fungi. Since seeds of G. elata are very small and lack an endosperm and other nutrients, their germination is difficult without requirement for external nutrients. Out of twenty six isolates collected from protocorms of G. elata and roots of native orchids inhabited in wild, two strains(H-2 and H-21) were observed to stimulate the seed germination of G. elata. The seed germination of G. elates was excellent on oak tree leaves medium. The optimal conditions for mycelial growth of symbiotic fungi were $25^{\circ}C$ and pH 6.0, respectively. The mycelial growth of H-2 strain was excellent on YMA medium, while H-21 was poor on PDA medium. In case of carbon sources, the mycelial growth of H-2 and H-21 was good on media supplemented with glucose and dextrin, respectively. Calcium nitrate was good for mycelial growth of H-2 strain as a nitrogen sources, whereas urea was effective to H-21 strain.

• Journal of Microbiology and Biotechnology
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• 제18권11호
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• pp.1826-1835
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• 2008

An autotrophic denitrification reactor (ADR-l) and a heterotrophic denitrification reactor (HDR-2) were operated to remove nitrate and nitrite in an anoxic environment in raw sewage. The $NO_3$-N removal rate of ADR-l was shown to range from 52.8% to 78.7%, which was higher than the $NO_3$-N removal rate of HDR-2. Specific denitrification rates (SDNR) of ADR-l and HDR-2 were 3.0 to 4.0 and 1.1 to $1.2\;mgNO_3$-N/gVSS/h, respectively. From results of restriction fragment length polymorphism (RFLP) of the 16S rRNA gene, Aquaspirillum metamorphum, Alcaligenes defragrans, and Azoarcus sp. were $\beta$-Proteobacteria that are affiliated with denitritying bacteria in the ADR-l. Specifically, Thiobacillus denitrificans was detected as an autotrophic denitrification bacteria. In HDR-2, the $\beta$-Proteobacteria such as Denitritying-Fe-oxidizing bacteria, Alcaligenes defragrans, Acidovorax sp., Azoarcus denitrificans, and Aquaspirillum metamorphum were the main bacteria related to denitrifying bacteria. The $\beta$-and $\alpha$-Proteobacteria were the important bacterial groups in ADR-l, whereas the $\beta$-Proteobacteria were the main bacterial group in HDR-2 based on results of fluorescent in situ hybridization (FISH). The number of Thiobacillus denitrificans increased in ADR-l during the operation period but not in HRD-2. Overall, the data presented here demonstrate that many heterotrophic denitritying bacteria coexisted with autotrophic denitrifying bacteria such as Thiobacillus denitrificans for nitrate removal in ADR-l. On the other hand, only heterotrophic denitritying bacteria were identified as dominant bacterial groups in HDR-2. Our research may provide a foundation for the complete nitrate removal in raw sewage of low-COD concentration under anoxic condition without any external organic carbon or the requirement of post-treatment.

• 콘크리트학회논문집
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• 제20권4호
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• pp.477-486
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• 2008

탄소섬유시트 보강공법은 콘크리트구조물의 보강에 많이 사용되는 보강공법이다. 이러한 탄소섬유 보강공법에서는 콘크리트와 CFRP시트 사이의 경계면 거동이 전체 보강구조물의 거동을 지배하게 된다. 본 연구에서는 탄소섬유시트 보강공법을 적용한 콘크리트구조물의 경계면 거동에 대한 기존의 연구들을 고찰하고, 이를 바탕으로 경계면 부착거동해석에 효과적으로 사용될 수 있는 새로운 bond-slip model을 제시하고, 경계면의 부착거동을 해석할 수 있는 해석 기법을 제안하였다. 새롭게 제시된 bond-slip model은 기존의 bilinear bond-slip model을 개선한 것으로서, 전단응력이 증가하는 구간을 2개의 직선구간으로 구성하고, 전단응력이 감소하는 구간을 지수함수로 구성한 것이다. 제안된 bond-slip model은 기존의 부착전단 실험 결과 및 경계면 거동 모델들과의 비교를 통하여 검증하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.41-44
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• 2008

Fiber Reinforced Plymers (FRPs)는 기존 보수 보강재료에 비해 높은 강도, 내부식성, 절연성등 뛰어난 역학적 특성으로 인하여, 최근들어 기존 구조물의 보수 및 보강에 FRP를 이용한 외부부착 공법 이 활발하게 사용되어지고 있다. 현재 국내 외적으로 FRP 재료를 이용한 외부부착 공법이 적용된 철근 콘크리트보에 관한 연구는 활발히 진행되고 있으나 시간 의존적 거동에 관한 연구는 아직 미흡한 실정이다. 이에 대하여 본 연구에서는 무보강 RC보, Carbon Fiber Reinforced Plymers(CFRPs) 와 Glass Fiber Reinforced Plymers (GFRPs)로 보강된 철근콘크리트보 실험체를 제작하여 약 300일간 25KN의 지속하중을 받은 FRP 보강보의 시간경과에 따른 처짐, 변형률 그리고 온도 변화의 영향을 관찰하였다. 실험 결과 CFRP로 보강된 실험체는 GFRP로 보강된 실험체보다 시간의존적 거동에 있어 더 우수한 보강성능이 있음을 확인할 수 있었다.

• Smart Structures and Systems
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• 제17권1호
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• pp.91-105
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• 2016

One of the most commonly used techniques to strengthen steel reinforced concrete structures is the application of externally bonded patches in the form of carbon fiber reinforced polymers (CFRP) or recently, textile reinforced cements (TRC). These external patches undertake the tensile stress of bending constraining concrete cracking. Development of full-field inspection methodologies for fracture monitoring are important since the reinforcing layers are not transparent, hindering visual observation of the material condition underneath. In the present study acoustic emission (AE) and digital image correlation (DIC) are applied during four-point bending tests of large beams to follow the damage accumulation. AE helps to determine the onset of fracture as well as the different damage mechanisms through the registered shifts in AE rate, location of active sources and change in waveform parameters. The effect of wave propagation distance, which in large components and in-situ can well mask the original information as emitted by the fracture incidents is also discussed. Simultaneously, crucial information is supplied by DIC concerning the moments of stress release of the patches due to debonding, benchmarking the trends monitored by AE. From the point of view of mechanics, conclusions on the reinforcing contribution of the different repair methodologies are also drawn.

• 한국구조물진단유지관리공학회 논문집
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• 제3권3호
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• pp.245-251
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• 1999

이 연구는 탄소섬유판공법을 사용하여 보강된 철근콘크리트 슬래브에 집중하중 즉 같은 위치에서 휨모멘트와 전단력이 동시에 최대가 되는 경우에 대하여 탄소섬유판의 두께를 변수로 하여 슬래브의 구조적 거동을 실험하였다. 탄소섬유판의 두께에 따른 내력의 차이는 뚜렷이 나타나지 않았으며 이는 보강시험의 주된 파괴가 탄소섬유판의 파단이 아닌 하중점 주위에서의 휨-전단균열에서부터 층분리가 시작되기 때문이다. 그러므로 재하상태에 따른 설계방법을 다르게 할 필요가 있으며, 특히 같은 위치에서 휨 모멘트와 전단력이 최대가 되는 경우 탄소섬유판의 두께는 최대 0.6mm로 하고 무보강슬래브의 휨모멘트에 대한 보강된 슬래브의 휨모멘트는 1.5-2.0으로 제한하는 것이 바람직하다.

• 대한조선학회논문집
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• 제47권5호
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• pp.697-702
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• 2010

A WIG(Wing-In-Ground effect) craft flies close to the water surface by utilizing a cushion of relatively high pressurized air between its wing and water surface. This implies that when one designs such craft it is important to have lightweight structures with adequate strength to resist external loads with some margins. To investigate this requirement, this paper deals with the structural analysis of the bottom plate of small WIG craft having a design landing weight of 1.2-ton. As building materials for the WIG craft, pre-preg carbon/epoxy composites are considered. The strength information of the bottom plate is obtained using the first-ply-failure analysis in conjunction with a mid-plane symmetric laminated plate theory. As a result, the first-ply-failure location, load and deflection of the bottom plate are obtained. The calculated strength information is compared with the water reaction load for the bottom plate of seaplanes considered when they land on the water surface -the same fluid-structure interaction mechanism as that of WIG craft. In the calculation of seaplane water reaction load information, the rules shown in FAR(Federal Aviation Regulations) Part 25 are used. Through the comparison, the structural integrity of the bottom plate for the WIG craft is checked.

• 한국철도학회논문집
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• 제11권6호
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• pp.569-574
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• 2008

전차선과 팬터그래프는 물리적인 접촉을 통하여 전동차에 전력을 공급하는 장치로, 전동차가 안전하게 운행할 수 있도록 기술적인 규정에 따라 정밀하게 시공되어야 한다. 전차선의 편위 및 높이는 여러 가지 외부 환경요소에 의하여 상태가 변화하며, 허용치를 초과한 진차선의 편위 및 높이는 높은 아크와 순간적인 전기 단전을 유발한다. 이는 팬터그래프와 전차선에 큰 손상을 주며 고장과 사고의 원인이 된다. 따라서 주기적으로 전차선의 상태를 점검하여 유지 및 보수를 할 수 있는 측정 장치의 요구가 증대되고 있다. 본 논문에서는 전차선의 높이 및 편위 검측 시스템에 관하여 기술하였다. 검측 시스템은 Acuity사의 AR4000레이저 거리측정기와 AccuRange 라인 스캐너를 사용하여 전차선 높이 및 편위를 측정한다.

• 대한예방한의학회지
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• 제22권3호
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• pp.61-72
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• 2018

Objectives : This study was conducted to review the research trends in Korean Medicine of pompholyx based on publications in Korea. Methods : Literature published after 2000 were collected using OASIS, NDSL, KISS, and key words searched were "한포진" "발한이상" "pompholyx" "dyshidrotic eczema". Results : 10 case reports and 4 patient studies were selected for study. Conclusions : Korean medicine treatments included acupuncture, pharmacopuncture, venesection therapy, herbal medicine, ointments and carbon arc lamp therapy. The most commonly used diagnostic method for pompholyx was inspection along with pulse diagnosis, abdominal diagnosis, tongue diagnosis, culture test, and KOH smear screening. The most frequently used treatment evaluation method was Likert scale while VAS(Visual Analog Scale) and Visual&Subjective symptoms were each used in 4 studies. Among 29 patients in 14 papers who showed clinical manifestations of pompholyx, there were 15 male patients (52%), 14 female patients (48%), and the male to female ratio showed 1.07:1. Symptoms were improved using Korean Medicine treatments including acupuncture and herbal medicine. Concurrent treatment using special treatments such as pharmacopuncture, jiyang-go, bojungikgi-tang(ex), external applications showed higher treatment effects. Korean medical treatment of pompholyx was effective in all studies, but the lack of numbers of research on Korean medicine of pompholyx was witnessed compared to other diseases such as psoriasis. Also considering the number of patients suffering from pompholyx, further studies should be conducted.