• Food Science of Animal Resources
• /
• v.33 no.3
• /
• pp.377-389
• /
• 2013

Gamma-amino butyric acid (GABA) is a kind of pharmacological and biological component and its application is wide and useful in Korea specially, becoming aging society in the near feature. GABA is request special dose for the purposed biological effect but the production of concentrated GABA is very difficult due to low concentration of glutamic acid existed in the fermentation broth. To increase GABA concentrate using fermentation technology, high content of glutamic acid is required. For this reason, various strains which have the glutamic acid decarboxylase (GAD) and can convert glutamic acid to GABA, were isolated from various fermented foods. Most of GABA producing strains are lactic acid bacteria isolated from kimchi, especially added monosodium glutamate (MSG) as a taste enhancer. Optimizing the formulation of culture media and the culture condition, GABA conversion yield and amounts were increased. Finally GABA concentration of fermentation broth in batch or fed batch fermentation reached 660 mM or 1000 mM, respectively. Furthermore formulation of culture media for GABA production developed commercially. Many studies about GABA-rich product have been continued, so GABA-rich kimchi, cheese, yogurt, black raspberry juice and tomato juices has been also developed. In Korea many biological effects of GABA are evaluated recently and GABA will be expected to be used in multipurpose.

• Food Science and Biotechnology
• /
• v.16 no.2
• /
• pp.270-274
• /
• 2007

To characterize the polysaccharides which exist as soluble forms in fruit wines, crude polysaccharides were isolated from red, white, raspberry, wild grape, and pear wine, respectively. Among them, the crude polysaccharide (RW-0) in red wine showed the highest yield and considerable amounts of thiobarbituric acid (TBA)-positive materials. The pectic polysaccharide RW-2 was purified to homogeneity from RW-0 by subsequent size-exclusion chromatography using Sephadex G-75 and its structure was characterized. RW-2 consisted of 14 different monosaccharides which included rarely observed sugars in general polysaccharides, such as 2-O-methyl-fucose, 2-O-methyl-xylose, apiose (Api), 3-C-carboxy-5-deoxy-L-xylose (aceric acid, AceA), 3-deoxy-D-manno-2-octulosonic acid (Kdo), and 3-deoxy-D-lyxo-2-heptulosaric acid (Dha). Methylation analysis indicated that RW-2 comprised at least 20 different glycosyl linkages such as 3,4-linked fucose, 2,3,4-linked rhamnose, 3'-linked apiose, and 2,3,3'-linked apiose, being characteristic in rhamnogalacturonan II (RG-II). High performance size-exclusion chromatography indicated that RW-2 mainly comprised RG-II of higher molecular weight (12,000), and that the changes of molecular weight to apparent 7,000 under less than pH 2.0 were observed. These analyses indicated that the higher molecular weight polysaccharide in RW-2 was mainly present as a RG-II dimer.

• Atmosphere
• /
• v.28 no.3
• /
• pp.317-324
• /
• 2018

In this study, we review the ground-based whole-sky camera (WSC), which is developed to continuously capture day and night cloud images using the illumination data from a precision Lightmeter with a high temporal resolution. The WSC is combined with a precision Lightmeter developed in IYA (International Year of Astronomy) for analysis of an artificial light pollution at night and a DSLR camera equipped with a fish-eye lens widely applied in observational astronomy. The WSC is designed to adjust the shutter speed and ISO of the equipped camera according to illumination data in order to stably capture cloud images. And Raspberry Pi is applied to control automatically the related process of taking cloud and sky images every minute under various conditions depending on illumination data from Lightmeter for 24 hours. In addition, it is utilized to post-process and store the cloud images and to upload the data to web page in real time. Finally, we check the technical possibility of the method to observe the cloud distribution (cover, type, height) quantitatively and objectively by the optical system, through analysis of the captured cloud images from the developed device.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.11a
• /
• pp.1034-1036
• /
• 2017

최근 가구별 라이프스타일의 변화로 외식 소비문화가 증가하면서 간편하면서도 건강한 음식인 회전초밥을 찾는 수요도 늘어나고 있다. 하지만 기존 회전초밥 가게는 레일 위의 초밥을 일일이 직접 확인하고 만들어야하는 번거로움이 있어 판매량 및 초밥 현황 파악에 정확성이 낮으며, 소비자는 초밥의 신선도가 떨어져도 알 방법 없다. 본 논문은 이러한 문제들의 해결책으로 라즈베리파이를 이용한 초밥 관리 시스템을 제안한다. 이 시스템의 첫 번째 기능은 회전하는 레일에 부착된 파이카메라로 영상처리를 하여 불필요한 인력 없이 한눈에 레일 위의 초밥을 확인한다. 두 번째 기능은 RFID 태그로 시간을 체크하여 최대한의 신선도를 유지하면서 고객에게 상품을 제공한다. 세 번째 기능은 카메라와 RFID로 판매량을 파악하고 웹에서 조회 가능하게 한다. 즉, 이 시스템은 실시간으로 판매량과 초밥 공급을 확인할 수 있도록 하고, 더욱 신선한 상품을 제공하여 상품의 질적 향상과 일의 효율성을 높일 수 있도록 한다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.11a
• /
• pp.1231-1234
• /
• 2017

이 논문은 실내 환경을 개선하기 위한 창문 자동제어 시스템을 제안한다. 현대인들은 하루에 약 70% 이상을 실내에서 생활하고 있다. 이로 인해 실내 환경의 질이 매우 중요한 요소로 부각되면서 사람들의 관심이 크게 증가하고 있다. 이 논문에서는 아두이노, 라즈베리 파이 및 다양한 센서를 이용하여 실내 환경을 적정수준으로 유지하고 개선할 수 있는 창문 자동제어 시스템을 제안한다. 제안 시스템 구현을 위해 온습도 센서, 미세먼지 센서, 공기 질 센서, 모터 등을 이용한다. 또한 3D프린팅을 이용하여 제작한 프로토타입을 보인다.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.12 no.6
• /
• pp.1093-1098
• /
• 2017

In this study, we designed the system that helps drivers check all information about parking space at the entrance and find out whether the places is available or not, because the system has 'Image recognition function' which can even recognize car number plates exactly. Besides, we place the webcam close to the car number plate, so that car number can be identified more quickly. Finally, since we set the webcam high, the system keeps us from parking wrong places by displaying on the screen.

• Journal of Electrochemical Science and Technology
• /
• v.8 no.1
• /
• pp.25-34
• /
• 2017

Concurrent electrocatalysis and sensing of hydrazine, sulfite ions, and nitrite ions in a mixture were studied using electrodes modified by electrodeposited Au nanostructures (NSs). The ${\beta}$-cyclodextrin-mixed silicate sol-gel composite was drop-casted on the electrode surface and nucleation guided by ${\beta}$-cyclodextrin occurred, followed by the electrodeposition of Au NSs. The additive, ${\beta}$-cyclodextrin, played an evident role as a structure-directing agent; thus, small raspberry-like Au NSs were obtained. The modified electrodes were characterized by surface characterization techniques and electrochemical methods. The Au NSs-modified electrodes effciently electrocatalyzed the oxidation of toxic molecules such as hydrazine and sulfite and nitrite ions even in the absence of any other electron transfer mediator or enzyme immobilization. Well-resolved oxidation peaks along with decreased overpotentials were noticed during the electrooxidation process. The fabricated Au nanostructured electrode clearly distinguished the electrooxidation peaks of each of the three analytes from their mixture.

• Journal of IKEEE
• /
• v.21 no.3
• /
• pp.227-233
• /
• 2017

Python language is widely used because of its ease of learning and its wide application range. Arduino, on the other hand, is also widely utilized hardware for physical computing and internet of things(IoT). However, Arduino is controlled by $C{^+^+}$ language, which makes it difficult for non-experts to enter swiftly. This paper proposes an errorless protocol that can simultaneously control multiple Arduino devices in a master device using python language with I2C communication. Using the protocol proposed in this paper, we can take advantage of the python language to control multiple Arduinos.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.13 no.4
• /
• pp.859-864
• /
• 2018

This paper is about image improvement - we used the contrast ratio and the outline emphasis method after synthesizing two low quality images utilized by several low definition cameras. Two raspberry cameras were used to capture each image, and then we synthesized images with MATLAB program. After applying the mean computation (alignment, geometry, and harmony) to synthesized image, we extracted the cross-space. In the experiment of this study, we identified and compared the improvement consequences of extracted, synthesized image after applying outline emphasis(unsharpmask filter, highboost filter) and increasing contrast ratio (histogram uniformity, histogram stretching) to the original images.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2015.10a
• /
• pp.24-26
• /
• 2015

최근 많이 활용되고 있는 라즈베리파이에 기반한 임베디드 시스템을 구축함에 있어서 사용자는 회로에 대한 이해와 하드웨어 비용이라는 측면에서 어려움을 갖게 되는 경우가 많다. 본 논문에서는 이러한 시스템을 가상으로 테스트할 수 있는 솔루션을 제안하고자 한다. 개발된 프로그램은 사용자가 실제 회로를 구성하는 것과 같이 가상의 공간에서 모듈을 배치하고 모듈 간에 선을 연결하는 것으로 회로를 구성하고 동작을 테스트할 수 있다 프로그램은 회로편집기, 인터프리터, 시뮬레이터의 세 가지 요소로 구성되어 있으며 전체 9개의 모듈을 제공하고 있다. 각각의 모듈은 제조사에서 제공하는 데이터 시트와 제원을 바탕으로 실제 회로 테스트를 거쳐 추상화하는 작업을 수행하였다. 개발된 프로그램의 품질수준을 한층 끌어올린다면 비용절감과 학습, 교육 측면에서 유용하게 이용될 수 있으며, 전기물리엔진의 구현, 실제 보드로 포팅이 가능한 수준의 인터프리터, 시뮬레이션 로직의 일반화가 필요할 것으로 판단된다.