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중소기업형 CIM시스템 구축을 위한 생산계획수립 및 실적파악 모듈
최후곤,신완선,장중순,서준성,여명구,안동근,김진봉 成均館大學校 科學技術硏究所 1996 論文集 Vol.47 No.2
This study Focuses on developing several modules involved in an integrated production information system for medium- or small-sized industries. The modules of order management, quality control, production scheduling, and shop management are executed for an example case industry. The potential values of this research includes that the major information modules to collect, analysis, and display production data and shop data for constructing the computer integrated manufacturing system(CIMS) are programmed with various features of medium- or small-sized industries
이정화,최후균 조선대학교 약학연구소 1998 藥學硏究誌 Vol.19 No.1
To develop piroxicam transdermal plaster, the effect of adhesive matrix and various vehicles on the permeation of piroxicam across hairless mouse skin was evaluated. The permeation rate of piroxicam was higher from polyisobutylene adhesive matrix than from acrylic adhesive matrix. Piroxicam seemed to be saturated in acrylic adhesive at the concentration range of 8.3% - 11.1%. Isopropyl myristate did not have significant effect on the permeation rate of piroxicam from acrylic adhesive matrix. However, it increased permeation rate of piroxicam from rubber adheisve matrix. When various permeation enhancers were tested in rubber adhesive matrix, transcutol showed the best results. Considering the measured solubility of piroxicam in those enhancers, it can be concluded that no relationship can be found between the thermodynamic activity of piroxicam and the permeation rate across the skin. It also indicates that the mechanism of the permeation enhancers is the change in the barrier property of the skin.
류호정,김정우,구형남,최정후 건국대학교 산업기술연구원 1999 건국기술연구논문지 Vol.24 No.-
The bed expansion characteristics have been investigated in a fluidized bed (0.1 m I.D., 2.4 m height) with variations of the gas velocity (0.015 - 1.0 m/s), the static bed height (0.1, 0.2m) and the type of particle (Geldart group A, B and D). The ratio of bed expansion increased as the gas velocity increased. However, it decreased with an increase of the static bed height. It also decreased in order of Geldart group A, B and D particles at the same excess gas velocity and static bed height. A correlation on the bed expansion has been proposed on the basis of the present experimental result.
( Jung-hoo Kook ),( Na-eun Kim ),( Kung-mun Choi ),( Yeon-jung Kim ),( Yong-joo Kim ),( Dong-cheol Seo ),( Hyeon-tae Kim ) 한국농업기계학회 2021 농업기계공학 Vol.1 No.1
At the 21st General Assembly of the Parties in 2015, the Paris Agreement, which will be the basis of a new climate system in which all countries participate, was adopted from 2020, and a system in which all countries participate in GHG reduction was established to reflect their own circumstances. Korea should reduce a total of 276.5 million tons compared to BAU (850.8 million tons) in 2030, and the agricultural and livestock sector should reduce 1.6 million tons. In order to achieve this, this study was conducted because it was necessary to identify major greenhouse gas sources. The criteria for the year of use were divided into three stages: 5 years or less, 6 to 10 years, and 11 years or more, and 18 agricultural heaters actually used by farms were set, and gas from exhaust pipes was collected and analyzed. As an analysis device, a gas chromatography system (Agilent technologies 7890B) was used, and as a result of the analysis, the average carbon dioxide emission concentration was 971.83 μmol/mol for 5 years or less, 1,209.83 μmol/mol for 6 years or more and 10 years or less, and 1,268.5 μmol for 11 years or more. More samples will be required for accurate results, but when comparing each value, it is judged that there is a difference in carbon dioxide emission concentration depending on the year of use of the agricultural heaters.
정후길 ( Hoo Kil Jung ),최하늘 ( Ha Nuel Choi ),오현희 ( Hyun Hee Oh ),허창기 ( Chang Ki Huh ),양희선 ( Hee Sun Yang ),오전희 ( Jeon Hui Oh ),박종혁 ( Jong Hyuk Park ),최희영 ( Hee Young Choi ),김경희 ( Kyoung Hee Kim ),이승구 ( S 한국유가공기술과학회 2012 Journal of Dairy Science and Biotechnology (JMSB) Vol.30 No.2
Molds cause severe cheese deterioration, even though some white and blue molds are used for the manufacture of Camembert and Blue cheese, respectively. The species of Geotrichum, Moniliella, Aspergillus, Penicillium, Mucor, Fusarium, Phoma, and Cladosporium are the main fungi that affect contamination during cheese ripening. Once deteriorated by fungal spoilage, cheese becomes toxic and inedible. Fungal deterioration of cheese decreases the nutritional value, flavor profiles, physicochemical and organoleptic properties, and increases toxicity and infectious disease. Fungal contamination during cheese ripening is highly damaging to cheese production in Korean farmstead milk processing companies. Therefore, these companies hesitate to develop natural and ripened cheese varieties. This article discusses the recent and ongoing developments in the removal techniques of fungal contamination during cheese ripening. There are 2 categories of antifungal agents: chemical and natural. Major chemical agents are preservatives (propionic acid, sodium propionate, and calcium propionate) and ethanol. Among the natural agents, grapefruit seed extract, phytoncide, essential oils, and garlic have been investigated as natural antifungal agents. Additionally, some studies have shown that antibiotics such as natamycin and Delvocid(R), have antifungal activities for cheese contaminated with fungi. Microbial resources such as probiotic lactic acid bacteria, Propionibacterium, lactic acid bacteria from Kimchi, and bacteriocin are well known as antifungal agents. In addition, ozonization treatment has been reported to inhibit the growth activity of cheese-contaminating fungi.
Jae Hoo Choi,Gi Hye Lee,Hannah Lee,Jung Dae Lim,Ki Hyun Kim,Jae Hak Lee,Jae Geun Lee,Seon Kang Choi,Na Young Kim,Chang Yeon Yu 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.10
Background : This study was performed to investigate by antioxidant activity, total phenolic contents, total flavonoid contents, and effective component of Astragalus membranaceus treated with different artificial light Sources (fluorescent lamp, red, blue, green, white, LEP). Methods and Results : We investigated the effects of various artificial light sources on the DPPH radical activity, total phenol and flavonoid contents, tyrosinase activity and main flavonoid compounds contents (formononetin and calycosin) and other biological activities in A. membranaceus. Antioxidant activities were 53.6% as the highest level of activity under LEP light. Growth under LEP light also produced the highest total phenolic and flavonoid contents of 36.05 and 5.94 mg/ml, respectively. Extracts from plants grown under LEP light caused the highest inhibition of tyrosinase activity with inhibition of 35.37, 61.87, and 65.49%, respectively, for extract concentrations of 100 μg/ml, 500 μg/ml, and 1000 μg/ml compared with other artificial light treatments. Conclusion : Little information is available on the influence of LED and LEP light sources on antioxidant production or other biological activities in A. membranaceus. Our goal in this study was to determine the effects of LED and LEP artificial light sources on the production of new functional compounds in A. membranaceus.
정정열(Jung-Yeul Jung),오후석(Hoo-Suk Oh),곽호영(Ho-Young Kwak),최경빈(Kyong-Bin Choi),고창복(Chang-Bok Ko) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Convective heat transfers of a nanofluid in rectangular microchannel were measured. An integrated microsystem consisting of a single microchannel on one side and two localized heaters and seven polysilicon temperature sensors along the channel on the other side were fabricated. Aluminum dioxide (Al₂O₃) suspended nanofluids with various particle volume fractions were used in experiment to investigate the effect of the volume fraction of the nanoparticles to the convective heat transfer and fluid flow in microchannels. The convective heat transfer coefficient with Al₂O₃ suspended nanofluid was measured to be increased up to 30 % compared to the distilled water at a volume fraction of 1.8 vol.% without major friction loss. A new type of convective heat transfer correlation was proposed to correlate experimental data of heat transfer for nanofluids in microchannels.