• 생약학회지
• /
• 제52권3호
• /
• pp.157-162
• /
• 2021

The heat-mediated reflux apparatus extraction of Paeonia lactiflora Pall. has been widely used as a traditional extraction method. In this paper, the microwave apparatus extraction method of Paeonia Radix was performed and the active ingredients and functional constituents were compared with the reference extraction method. The most effective extraction condition of albiflorin using the microwave was 120℃ in 50% methanol, and paeoniflorin was maximally extracted at 60℃. The reduced level of paeoniflorin molecule at high-pressure and high-temperature extraction condition was caused by the molecular instability. Additionally, the microwave extraction of 50% methanol extracts at 150℃ showed the highest functional constituents determined by in vitro DPPH radical scavenging activity, polyphenol concentration, and tyrosinase inhibition assay. The microwave apparatus was adapted as a rapid, low-cost, and environmentally friendly method to extract active ingredients and the practical extraction conditions of Paeonia Radix can be used in industrial applications.

• 동아시아식생활학회지
• /
• 제11권2호
• /
• pp.131-139
• /
• 2001

The physicochemical and sensory characteristics of brown rice flakes by different processing conditions such as flaking Process and their heat treatments were investigated to establish the brown rice flake processing procedure. To successfully make the compressed rice grain type flakes, the most appropriate water steeping conditions were 5 hours at 60'C. The brown rice flakes by compressed flaking procedure and heat treatment with microwave toasting showed the best crispiness-texture that tested from textrometer or sensory evaluation, and there was no significant difference between the source of rice varieties. The water absorption index(WAI) of tested flakes were negatively correlated with the water soluble index( WSI) and positively correlated with bowl life. The flakes made by compressed flaking procedure and heat treatment with microwave toasting showed longer bowl life, which is the length of the time that the cereal can retain its crispness after being soaked in milk.

• 한국산학기술학회논문지
• /
• 제16권7호
• /
• pp.4388-4397
• /
• 2015

이 연구는 아크릴 수지의 유도광선변화에 따른 속성 변화를 연구하여 최적의 특성을 가진 아크릴 수지를 개발할 수 있도록 건열 및 마이크로파 경화 의치상 아크릴 수지의 향상된 물성에 대한 연구이다. 굽힘강도와 경도, 색차를 관찰한 결과 Vertex RS 및 Paladent 20는 건식 열 경화 시편 5, 15, 25 kGy의 조사에 이상적인 속성을 보였다. 마이크로 웨이브 경화에서는 5 kGy의 조사에서 이상적인 속성을 보였다. 상관관계 분석은 ARD와 굴곡 강도 (0 418), E 계수 (0.675), 및 바콜 경도 (0 588) 사이의 긍정적인 상관관계를 보여 주었다. 방사선 경화형 기술은 고분자 복합 재료의 제작으로 인한 오염 문제를 완화하는 데 도움이 될 수 있으며 고분자의 가공성에 영향을 주지 않고 자외선 경화 기술과 나노 기술 융합 및 기계적 특성의 향상에 크게 기여할 수 있다.

• Journal of Biosystems Engineering
• /
• 제40권3호
• /
• pp.224-231
• /
• 2015

Purpose: Corn is a major commercial crop targeted for genetic modification owing to its high consumer demand as a foodstuff for humans and livestock, as well as its other industrial applications. However, the safety of genetically modified (GM) crops is controversial. Indeed, several countries have banned the importation of GM seeds that can germinate. Therefore, development of effective, convenient, and nondestructive methods to inhibit seed germination is required. Methods: This study aimed to examine the efficacy of microwave heat treatment for inhibition of germination of corn kernels and for optimization of power and exposure time required for effective aging treatment. Artificial inhibition was induced in corn kernels using microwave heat treatment. Seven power levels were examined (400, 500, 600, 700, 800, 900, and 1000 W) at each of the four exposure times (0.5, 1.0, 1.5, and 2.0 min). Results: Corn kernels could be aged effectively after heating for 0.5~1.0 min at powers greater than 800 W, with increasing efficacy observed at higher powers. Further analysis showed that the most effective inhibition of germination was observed at 1000 W for 40 s. This setting did not cause any physical damage to the corn kernels. Conclusions: Optimal inhibition of corn kernel germination was achieved using higher power for shorter times, which may be useful for industrial corn seed treatment.

• Radiation Oncology Journal
• /
• 제2권1호
• /
• pp.11-20
• /
• 1984

The renewed interest in the use of hyperthermia in cancer therapy is bases on radiobiological and clinical evidence indicated that there may be a significant therapeutic advantage with the use of heat alone or combined with radiation or chemotherapy, There are many methods for generating heat for localized tumor as like radiofrequency, microwave, electromagnetic induction and ultrasound. But it is very difficult to be even thermal dose distribution and stable output of power and then the detection of temperature in tumor is difficult to be precise with thermocouples and semiconductor sensors. We designed the microwave heating generator, dipole antenna applicators and autometic temperature controlled thermocouples for localized hyperthermia on skin and in cavities. 1. The microwave generator with 120 W, 2,450MHz magnetron could be heating up to $40^{\circ}C\~50^{\circ}C\;for\;1\~2$ hours in living tissues. 2. The thermal dose distribution in tissue with microwave was described $42^{\circ}C\~44^{\circ}C$ with in 3 cm depth and $2\~6cm$ diameter area. 3. Skin surface heating applicator with spiral 3 times wave length antenna radiated high Power of microwave. 4, Intracavitary heating applicator with dipole antenna with autometic control temperature sensor kept up continuously constant temperature in tissue. 5. For constant thermal distribution, applied two steps power with 10W microwave after $17\~20W$ during first 10 minutes. 6. The cooling rate by blood flew in living tissue was rised as $10\%$ then meats.

• 한국건축시공학회지
• /
• 제1권2호
• /
• pp.179-184
• /
• 2001

The most recent building trend is going large, high rise, high strength as overlarge project is developing in domestic construction business. Belite cement has properties like low heat, excellent long term strength, and durability without admixture(fly ash, silica fume). so, Beilte cement is suitable for mass structure which is needed high strength, high fluidity and low heat property. This study is to examine the possibility if site adoption microwave-use early strength estimation method. Based on the existed study related the portland cement, the interrelation between Belite cement and microwave-use early strength estimation method is required. In this study, interrelation between mortar and Evaluating strength estimation method is investigated before the concrete experiment.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
• /
• pp.1077-1082
• /
• 2001

The most recent building trend is going large, high rise, high strength as overlarge project is developing in domestic construction business. Belite cement has properties like low heat, excellent long term strength, and durability without admixture(fly ash, silica fume). so, Belite cement is suitable for mass structure which is needed high strength, high fluidity and low heat property. This study is to examine the possibility of site adoption microwave-use early strength estimation method. Based on the existed study related the portland cement, the interrelation between Belite cement and microwave-use early strength estimation method is required. In this study, interrelation between mortar and Evaluating strength estimation method is investigated before the concrete experiment.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
• /
• pp.1041-1046
• /
• 2003

The most recent building trend is going large, high rise, high strength as overlarge project is developing in domestic construction business. Belite cement has properties like low heat, excellent long term strength, and durability without admixture (fly ash, silica fume). So, Belite cement is suitable for mass structure which is needed high strength, high fluidity and low heat property. This study is to examine the possibility of site adoption microwave-use early strength estimation method. Based on the existed study related the portland cement, the interrelation between Belite cement and microwave-use early strength estimation method is required.

• 한국구조물진단유지관리공학회 논문집
• /
• 제18권4호
• /
• pp.126-137
• /
• 2014

목재 건조의 용이성 및 품질확보, 2차 보존처리를 위한 기초자료 확보를 위해 초고주파를 이용한 캐나다산 직수입 미송의 가열 건조 특성은 다음과 같다. 초고주파 조사 후 목재 내부 온도변화 곡선을 분석한 결과 원주목은 3kW 30분 및 120분 가열 할 경우, 판목은 4kW 3분 및 9분 가열 시 안정적인 열분포와 소비 열량, 표면 함수분포 확보가 가능한 것으로 나타났다. 특히 초고주파 가열에 따른 표면 함수분포는 매우 균일한 Leveling이 이루어진 것으로 나타났으며, 함수 감소율도 중량대비 30% 이상인 것으로 나타나 건조효율이 우수한 것으로 나타났다. 또한 소비 열량 분석 결과에 따라 2차 액상 보존처리를 위한 침지 시 대량의 보존처리제 침투가 가능할 것으로 사료되므로, 초고주파 가열 목재는 빠른 함수감소 및 건조 특성과 많은 열량의 소비가 가능하여 산업재로의 사용 및 2차 응용제품 개발에 우수한 특성이 있는 것으로 사료된다.

• 한국식품저장유통학회지
• /
• 제4권1호
• /
• pp.17-25
• /
• 1997

The effects of microwave treatment on the perservation of foods, such as a seaweed soup and sea stoned radish shreds, were studied. Microwave treatment of microbial cell suspensions revealed that viable cells decreased dramatically when heated to 6$0^{\circ}C$. However, it was unlikely that microwave treatment to 60 is enough to decrease the viable cell counts efficiently in a seaweed soup and radish shreds. It was thought that microwave heating to at least 7$0^{\circ}C$ as a final temperature was an important factor to reduce microbial cell counts in foods. When foods were heated to 7$0^{\circ}C$ with a repetitive 15 sec "on" followed by 30 sec "off", no big differences were observed in viable counts during storage at 2$0^{\circ}C$ for 3 days, as compared to those treated with a full power. The microwave treatment with three stages was designed to solve problems associated with variations depending on food volumes and difficulties of heat diffusion in a solid food to be irradiated with a microwave oven. The three stage method was found to have a similar efficiency in the reduction of viable cell counts in foods to microwave treatment at a full power and to conventional methods, such as water bath heating or boiling for 3 min with a gas range.in with a gas range.