• 한국축산식품학회지
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• 제34권3호
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• pp.307-315
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• 2014

pH adjustment would be of advantage in improving the water holding capacity of muscle proteins. The objective of this study was to evaluate the addition of fish sarcoplasmic protein (SP) solution, which was adjusted to pH 3.0 or 12.0, neutralized to pH 7.0, and lyophilized to obtain the acid- and alkaline-treated SP samples, on the functional properties of the chicken myofibrillar protein induced by microbial transglutaminase (MTG). The solubility of alkaline-treated SP was higher than that of the acid counterpart; however, those values of the two pH-treated samples were lower than that of normal SP (p<0.05). All SP solutions were mixed with myofibrillar proteins (MP) extracted from chicken breast, and incubated with MTG. The shear stresses of MP with acid- and alkaline-treated SP were higher than that of normal SP. The thermal stability of MP mixture reduced upon adding SP, regardless of the pH treatment. The breaking force of MP gels with acid-treated SP increased more than those of alkaline-treated SP, while normal SP showed the highest value. The MP gel lightness increased, but cooking loss reduced, with the addition of SP. Smooth microstructure of the gel surface was observed. These results indicated that adjusting the pH of SP improved the water holding capacity of chicken myofibrillar proteins induced by MTG.

• 영재교육연구
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• 제20권2호
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• pp.503-526
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• 2010

본 연구에서는 과학적 창의력과 정서적 감수성의 관계를 알아보고자 고등학교 과학발명반집단(n=13)과 일반 고등학생집단(n=13)을 대상으로 정서를 유발하는 시각자극을 제시하고 뇌활동성을 기능성자기공명영상(fMRI)을 이용하여 분석하였다. 국내외 창의력 경진대회 수상자들을 중심으로 구성된 과학발명반집단은 창의적 성격검사(WKOPAY, SAM) 점수가 상위 96%이내였으며 일반집단은 보통 수준이었다. 정서를 유발하는 시각자극(IAPS사진) 제시 시 뇌활동성을 분석한 결과 과학발명반집단은 일반집단에 비해 중간측두이랑(MTG)과 상측두이랑(STG) 영역 등에서 뇌활동성이 높게 나타났다. 창의적 성격검사점수와 뇌활동성 간의 상관도를 분석한 결과 MTG, STG 영역 등에서 유의적인 상관도(p<0.005)를 나타내었다. 특히 흥분의 측면보다는 기분(유쾌/불쾌)의 측면에서 유의적인 상관도를 보이는 영역이 많았다. 이러한 결과는 과학적 창의력이 높은 학생들이 일반 학생들에 비해 정서적 감수성이 발달되어 있다는 점을 보여주는 것으로 과학영재교육 대상자의 선발과 교육프로그램에서 정서적 측면이 고려되어야 함을 시사한다.

• 한국전자파학회논문지
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• 제26권3호
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• pp.248-256
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• 2015

본 논문에서는 4G 이동 통신을 위한 메탈 폰용 보조 슬롯 하이브리드 MIMO 안테나를 설계하고, 이를 제작하였다. 보조 슬롯은 단말기 후면 메탈 커버에 슬롯을 내어 LTE class 40 대역을 담당하게 하였다. 보조 슬롯은 모노폴 안테나와 함께 하이브리드로 동작한다. 제안 안테나는 LTE class 13/ LTE class 14/ CDMA/ GSM/ DCS/ PCS/ W-CDMA/ LTE class 40 대역에서 VSWR 3:1 이하의 조건을 만족하였다. MIMO 동작을 위한 ECC(Envelope Correlation Coefficient)는 전 대역에서 0.2 이하의 특성을 보였다. MTG 무반사실 측정한 안테나의 평균 이득은 -5.57~-1.45 dBi이고, 효율은 27.75~71.6%로 측정되었다.

• 한국유체기계학회 논문집
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• 제14권5호
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• pp.24-30
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• 2011

500W class MTG(Micro turbine generator) operating at 400,000 rpm is under development. From the cycle analysis, it is decided that the self-sustaining speed of MTG is 200,000rpm and the generating speed is 400,000 rpm. Therefore, motor should be designed so that it is able to rotate the rotor up to 200,000rpm and generator should designed so that it is able to generate 500W output at 400,000rpm. First step to design motor/generator is to determine the power and efficiency requirement. Not only the power into the compressor and from the turbine at the operating speed but also the mechanical and electrical losses should be considered in determining the power and efficiency requirement. This study presents the procedure and the results of determining the power and efficiency requirement considering the mechanical and electrical losses depending on the rotating speed which is measured from the experiment.

• 한국군사과학기술학회지
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• 제14권6호
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• pp.1192-1197
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• 2011

Recent developments of small-size unmanned or manned mobile systems such as autonomous robots, exoskeleton or armored suits, micro air vehicles, and unmanned armored vehicles require long-lasting independent power sources of high energy and power density to support the systems' operation for up to 72 hours in the fields. Chemical batteries such as Ni-MH, Li-Ion, the current primary power sources for mobile devices, however, are not capable of providing enough power and energy density for the next generation high power mobile machines. For this reason, KIMM along with KERI and KIMS has been carrying out a 500W MTG development project under the DAPA's "Next generation military power source R&D program" since 2009. In this paper, a design process for a 500W MTG system currently being developed at KIMM is briefly described and the technical issues related to its development are addressed.

• 한국축산식품학회지
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• 제31권5호
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• pp.782-790
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• 2011

본 연구는 TGase 첨가에 따른 근원섬유 단백질과 비육류 단백질인 적소두단백질 또는 대두단백질간의 상호작용을 비교 평가하기 위해 수행되었다. 실험 1에서는 비육류 단백질 함량에 따른 물성 변화를 평가하였으며 실험 2에서는 TGase 반응시간에 따른 최적 조건을 평가하였다. 가열수율은 비육류 단백질을 첨가한 처리구에서 유의적으로 증가하였으며 특히 적소두단백질 1%을 첨가하였을 때 가장 높은 가열수율을 나타내었다(p<0.05). 반면에 겔 강도 및 점성도는 근원섬유 단백질 단독 처리구와 비육류 단백질을 첨가한 처리구와 비교하였을 때 유의적으로 차이가 나타나지 않았다(p>0.05). 또한 전기영동 결과는 가열 전 TGase 첨가 후 4시간 반응시켰을 때는 모든 처리구에서 변화를 보이지 않았지만(실험1), TGase 첨가 후 10시간 반응시킨 모든 처리구에서는 biopolymer 밴드가 나타났다(실험2). 또한 TGase 반응시간에 따른 겔 강도는 10시간째에 유의적으로 증가하였다(p<0.05). 하지만 10시간의 반응시간은 배양시간이 너무 길어 산업적으로 이용하기 부적합 하기 때문에 TGase함량을 0.5%로 증가시켜 효소와 단백질간의 최적 반응시간을 평가하고 비육류 단백질과의 상호작용을 통한 물성을 증진시키는 연구가 앞으로 필요할 것으로 사료된다.

• 한국축산식품학회지
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• 제35권6호
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• pp.841-846
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• 2015

This study was investigated to determine the effect of microbial transglutaminase (MTG) with or without red bean protein isolate (RBPI) on the porcine myofibrillar protein (MP) gel functionality at different pH values (pH 5.75-6.5). Cooking yield (CY, %), gel strength (GS, gf), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) were determined to measure gel characteristics. Since no differences were observed the interaction between 1% RBPI and pH, data were pooled. CY increased with the addition of 1% RBPI, while it was not affected by pH values. GS increased with increased pH and increased when 1% RBPI was added, regardless of pH. There were distinctive endothermic protein peaks, at 56.55 and 75.02℃ at pH 5.75, and 56.47 and 72.43℃ at pH 6.5 in DSC results, which revealed decreased temperature of the first peak with the addition of 1% RBPI and increased pH. In SEM, a more compact structure with fewer voids was shown with the addition of 1% RBPI and increased pH from 5.75 to 6.5. In addition, the three-dimensional structure was highly dense and hard at pH 6.5 when RBPI was added. These results indicated that the addition of 1% RBPI at pH 6.5 in MTG-mediated MP represent the optimum condition to attain maximum gel-formation and protein gel functionality.

• 한국유체기계학회 논문집
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• 제16권3호
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• pp.18-25
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• 2013

Recently the requirement of long-term mobile energy source for mobile robot or small-sized unmanned vehicle is highly increased, and the micro turbine generator(MTG) which is known to have high energy and power density is under development. MTG is designed to have air foil bearing and high speed rotor of which operating speed is 400,000rpm. In the development stage of high speed rotor and bearing, stability analysis for the full operational speed range is essential and the dynamic coefficients such as stiffness and damping coefficients of bearing depending on the rotational speed are required for that. Although perturbation method is usually used to identify the dynamic coefficients, it's not easy to give the perturbation to the high speed rotating rotor. In this study, we present the dynamic coefficients measurement system for air foil bearing which consists of electromagnets, gap sensors, high speed motor and controller. This measurement system can exert the sine sweep force to the rotor-bearing, measure the displacement of rotor and get FRF(Frequency response function) of rotor-bearing. The least square estimation method is applied to identify the dynamic coefficients of bearing from the measured frequency response at the different rpm and the identified dynamic coefficients for the wide rotational speed range are presented.

• 대한통합의학회지
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• 제11권3호
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• pp.127-135
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• 2023

Purpose : This study was performed to evaluate the effects of magnetic therapy (MT) on pain threshold, blood flow, and balance in patients with knee osteoarthritis. Methods : A single-blind, randomized controlled trial (RCT) was conducted with 30 patient with knee osteoarthritis. They were randomly allocated 2 groups; magnetic therapy group (MTG; n=15) and placebo magnetic therapy group (PG; n=15). The MTG group received 30 minutes magnetic therapy and 20 minute conservative physical therapy (Hotpack, ICT), magnetic therapy was conducted in magnetic therapy device (OM-100, NUGA, Korea). In the placebo magnetic group received 30 minutes placebo magnetic therapy and 20 minute conservative physical therapy. Each group performed 50 minutes a day 3 times a week for 8 weeks. The primary outcome pressure pain threshold test, blood flow, balance ability were measured by a pressure threshold meter (Commander algometer, JTECH medical, USA), laser dofler image (Moor LDI2-IR, Moor instruments, USA), balance measurement system (BioRescue, Marseille, France). The measurement were performed before and after the 8 weeks intervention period. Results : Both groups demonstrated significant improvement of outcome in pain threshold, blood flow, and balance ability during intervention period. magnetic therapy group revealed significant differences in pain threshold, blood flow, and balance as compared to the placebo magnetic therapy group groups (p<.05). Our results showed that magnetic therapy was more effective than placebo therapy on pain threshold, blood flow, and balance in patients with knee osteoarthritis. Conclusion : Our findings indicate that magnetic therapy can improve pain threshold, blood flow, and Balance, highlight the benefits of magnetic therapy. This study will be able to be used as an intervention data for recovering pain threshold, blood flow, and balance in patients with knee osteoarthritis.

• 전기저널
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• 통권300호
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• pp.78-83
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• 2001

미쓰비시電機가 제안하는 에너지솔루션은, 고객의 에너지절약, 코스트절약 및 환경개선의 파트너로서 현장에 밀착하여 에너지의 종합엔지니어링력(力)(에너지 발생$\cdot$공습$\cdot$이용기술)과 IT를 구사하여, 고객의 에너지와 관련된 여러 가지 과제(부분적인 과제에서 고객 전체의 에너지과제까지)에 대하여 에너지절약 컨설테이션, 설계시공, 설비리스, O&M, 에너지 공급, 에너지운용관리까지 폭넓게 고객과 함께 해결해 오고 있다. 그 일환으로서 동사는 마이크로 가스터빈의 코제너레이션 시스템''마이크로 에코터보 MTG-28''을 분산전원의 레퍼터리로서 제품화하고 동시에 분산전원에 의한 전$\cdot$열공급 서비스사업을 적극적으로 전개하고 있다. 동사는 Capstone사 제품인 28kW 마이크로 가스터빈을 이용하여 열이용을 포함한 코제너레이션 패키지를 개발하고 또한 고객의 큰 관심사항인 메인터넌스에 대해서도 24시간 원격감시하는 시스템을 실용화하여 애프터서비스 체제를 정비하고 있다.