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Scale-up of stirred media mills for fly ash grinding
이준헌,조희찬,권지회,옥정훈,정진안,이대양 한국자원공학회 2017 Geosystem engineering Vol.20 No.5
In this study, fly ash was ground for use as a CO2 foam stabilizer. The investigated set of mills comprised 1 L and 10 L batch-type wet grinding stirred media mills. The employed grinding media was zirconia (ZrO2) beads with a density of 6 g/cc and mean diameter of 1.0 mm. Grinding experiments were conducted under different rotational speeds of the rotor. The investigated rotational speeds varied from 360 to 800 rpm for each type of mill. Based on the experimental results, a scale-up procedure related to the net specific grinding energy was developed, taking mill dimension into consideration. With the developed procedure, the D50 particle size could be estimated on the basis of operating conditions such as the rate of revolution and grinding time. Finally, this study investigated a scale-up procedure for stirred media mills, and the useful application of the function to predict mean particle size.
주요 가축들의 유용 유전자 및 질병관련 유전자 연구현황
이준헌,박찬규 충남대학교 형질전환복제돼지연구센터 2007 논문집 Vol. No.10
Great success has been being achieved in identification and utilization of candidate genes affecting economically important as well as disease related traits in animals for the past two decades. This article reviews the current status of candidate genes in animals, with particular emphasis on the disease causing genes in livestock. Two different types of phenotypes, monogenic and polygenic, are also described. Finally, commercialized animal DNA markers, which can be used for the molecular breeding in near future, are discussed.
페카리 종 Tayassu tajacu에서 내인성 리트로 바이러스의 발견
이준헌,Lee, Jun-Heon Institute of Agricultural Science 2003 Korean Journal of Agricultural Science Vol.30 No.1
본 연구는 페카리와 돼지간의 내인성 리트로 바이러스의 연관성을 조사하기 위하여 실시되었으며 페카리의 리트로 바이러스의 DNA 염기서열을 알기위해 degenerate primers를 이용하였다. 두개의 리트로 바이러스의 클론이 이 연구에 의해 만들어 졌으며 DNA 염기서열을 분석하여 본 결과 기존에 알려진 쥐와 돼지의 리트로 바이러스 염기서열과 높은 상동성을 보였다. 이 페카리 리트로 바이러스는 페카리 종에 있어서 처음으로 밝혀진 내인성 리트로 바이러스인 동시에 페카리 종은 C형 리트로 바이러스 염기서열을 가지고 있지 않다는 기존의 연구결과와 상반된 것으로 그 중요성이 있다. To investigate the relationship of endogenous retroviruses in peccaries and pigs, a set of degenerate primers was used in this study to amplify peccary retroviral sequences. The sequences of two putative retroviral clones showed close homology to mouse and pig retroviral sequences. The peccary endogenous retroviral sequences are significant in that they are the first such sequences reported in peccary species and repudiate old claims in the literature that peccaries do not have C-type retroviral sequences.
이준헌,김태경 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
A halochromic fluorescence dye was synthesized to fabricate acid-gas sensing textiles. The dye has a maximumabsorption at 436 nm and stokes shift of 54 nm in ethanol, which means that it exhibits a typical fluorescence color ofgreenish yellow. The dye was designed to have good substantivity toward hydrophobic and chemical resistant polyethylenicfibers, such as high molecular weight polyethylene (HMWPE) fibers, by introducing di-butyl and t-butyl groups on coumarinand benzoxazole moieties of the chromophore, respectively. The fluorescence dye showed the change of both color andfluorescence emission properties not only in a solution by addition of hydrochloric acid but also inside the HMWPE fiber onexposure to gas phase hydrogen chloride even at relatively low concentrations. From the repeat test, the sensing performancewas maintained reversibly even after 20 repeat cycles of adsorption and desorption of gas phase hydrogen chloride. TheHMWPE fabrics dyed with the fluorescence dye can be washable by showing fastness of rating 4-5 to washing.
스포츠용 폴리우레탄 섬유 소재의 형광 발현 및 견뢰도 특성
이준헌,김소영,김태경 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.3
In order to develop high fastness fluorescence color on polyurethane fabrics used for sports, three fluorescent dyes having alkyl substituents were investigated. The quantum yield of the dyes was obtained the lowest value for Fluoro Yellow B (0.421) and higher ones for Fluoro Yellow A (0.782) and C (0.830). However, with regard to the fluorescence intensity on fabrics, Fluoro Yellow B showed stronger value than other two dyes. Durability of the dyeing against five organic solvents was appeared in the order of hexane, ethanol, benzene, acetone, and chloroform. Fastness to washing and rubbing was excellent for the three dyes showing ratings 4-5. Fastness to dry heating which had been worried about with regard to sublimation was good exhibiting ratings at least 4. Practically acceptable result was achieved in terms of light fastness which was one of the biggest drawback of fluorescence, showing ratings 3 for Fluoro Yellow B and 3-4 for Fluoro Yellow C except for rating 1 for Fluoro Yellow A.
랜덤포레스트 (Random Forest) 기반 다 범주 분류기를 이용한 실시간 대조 관리도
이준헌,백준걸 대한산업공학회 2017 대한산업공학회 추계학술대회논문집 Vol.2017 No.11
공정의 이상여부를 확인하고 원인 변수를 확인하는 과정은 제조 공정에서 매우 중요하다. 분포를 가정하여 수행되는 전통적인 관리도의 통계적 검정방법의 한계점을 극복하기위해서 연속적인 분류 문제로 접근하는 랜덤포레스트를 이용한 실시간 대조 관리도가 제안되었다. 이 방법은 원인 변수를 쉽게 확인할 수 있는 장점에도 불구하고 비정상 상태를 검출하는 능력의 한계가 있어서 데이터 간의 거리에 기반한 기계학습 기법을 이용하여 성능을 개선하려는 시도가 있었다. 본 논문에서는 기존 실시간 대조관리도의 두 범주 분류 문제를 데이터 간의 거리를 통해 새로운 범주를 생성하여 다 범주 분류 문제로 전환하는 연구를 통해 기존 방법의 장점을 유지하면서 결점 검출 능력을 크게 개선시킬 수 있는 랜덤포레스트 기반 다 범주 실시간 대조 관리도를 제안한다.
강황이 난황의 비강내 점적을 통하여 유발된 생쥐의 천식에 미치는 영향
이준헌,김종한,박수연,최정화,Lee, Jun-Hun,Kim, Jong-Han,Park, Su-Yeon,Choi, Jeong-Hwa 대한한방안이비인후피부과학회 2008 한방안이비인후피부과학회지 Vol.21 No.3
Objective : This study was designed to investigate the effects of Curcuma longa Rhizoma(CLR) on asthma. Methods : Detecting splenocyte proliferation rates, cytokines and antigen specific antibody isotypes in bronchoalveolar lavage fluid (BALF). In addition, the present author I also investigated changes in spleen and histopathological changes of lung tissues. Results : Oral administration of CLR lowered spleen weight and splenocyte proliferation rates. In addition, levels of IL-4, IL-17A and Granulocyte/Macrophage Colony-Stimulating Factor(GM-CSF), Th2 driven cytokines, were lowered respectively and IFN-g, and Th1 driven cytokine, were elevated by CLR. Levels of Ovalbumin(OVA) specific IgE and IgGl in BALF were also lowered by oral administration of CLR too. Conclusion : CLR is useful to treat patients with asthma and the mechanisms are related to the in suppression of Th2 skewing reactions.