W 입자크기가 W-Cu 복합재료의 전기 및 열전도도에 미치는 영향

양주환,오승탁,박상우,문인형 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.1

The electrical and thermal conductivity of W-Cu composites were investigated as a function of the W-particle size and W-W contiguity. Powder mixtures were prepared by ball milling or mechanical alloying process, and then sintered at various temperatures. The electrical conductivity of sintered composite was increased with decreasing W grain size. Dependence of electrical conductivity on the W grain size was explained by the W-W contiguity concept. The thermal conductivity was increased with increasing the temperature up to $600^{\circ}C$ but decreased at the temperature above $600^{\circ}C$ Also, thermal conductivity value was influenced by the W particle size. Change of thermal conductivity in W-Cu composites was discussed based on the observed microstructural characteristics and theoretical considerations.

고랭지배추 생산·유통체계의 발전전략

양주환,김기덕,Yang, J.H.,Kim, K.D. 국립한국농수산대학교 교육개발센터 2012 현장농업연구지 = Journal of practical agricultural resear Vol.14 No.1

The objective of this study is to provide development strategies in the production and distribution system of highland Chinese cabbage by evaluating and analyzing problems of the current system, focusing on several main stages between production and distribution system of highland Chinese cabbage. Through interview of groups such as farmers, distributers in the main producing areas, commission merchants of the wholesale market and large-scale distributors the relavant information was collected. Also, data such as production situations in main producing areas, distribution conditions in the wholesale market was analyzed. The functions of highland Chinese cabbage were classified and the current state of highland Chinese cabbage distribution system was investigated to provide an overall insight into the highland Chinese cabbage distribution system. Also the factors which will affect a price of wholesale market and consumer of highland Chinese cabbage were examined. Finally problems and improvements in the production and distribution system through analysis of the distribution system of highland Chinese cabbage were provided. the main contents of this study are as follows. The first is to keep stability of production in main producing areas by applying a differentiated production method, for example, rainshelter cultivation method. The second is to establish the distribution system which the relevant information is opened transparently. The third is that the consistent cold transportation system from main producing areas to consumers must be built.

농업종사가구와 비농업종사가구에 대한 삶의 만족도 결정요인에 관한 비교 연구

양주환 한국유기농업학회 2018 韓國有機農業學會誌 Vol.26 No.1

The objectives of this study are to analyze life satisfaction between agricultural and non-agricultural households using 1~4th KReIS (Korean retirement and income study) data, to investigate whether to affect on life satisfaction according to the employment industry of householder. and to examine various determinants of life satisfaction between agricultural and non-agricultural households. The summary of analysis results is as follows. First, life satisfaction is influenced by economic value. Also it is examined that both physical and mental health have a significant effect for life satisfaction. Especially, it is analyzed that the effect of mental health is larger than one of physical health for life satisfaction. In addition, it is investigated that life satisfaction of single-person households is higher than two or more person households. Second, there was significant difference between agricultural and non-agricultural households in life satisfaction. It was proved that life satisfaction of agricultural households is higher than non-agricultural ones. As a result, it is confirmed that life satisfaction is influenced by industrial characteristic and mental health rather than another determinants.

농식품 생산단지 조성에 대한 농식품 업체 및 소비자 태도에 관한 연구

양주환,안성식,민승규 (사)두레마을 친환경농업연구원 2007 친환경농업연구 Vol.9 No.1

The preferences of consumers toward the nature-friendly agricultural products and food safety are highly increased lately. However, there is no a production complex that produces only agricultural-food to be assured a food safety and sanitary conditions. Therefore the validation study about construction of an agricultural-food production complex to improve consumer's needs of food safety and a competition power of agricultural-food companies is meaningful significant. The purpose of this study is to analyze and investigate an attitude of agricultural-food companies and consumers to construct an agricultural-food production complex in Chungnam-do Province. At the first stage, we searched a difference of consumer's attitude about construction of an agricultural-food production complex by purchasing factors of consumer through ANOVA. Especially, food safety and sanitary condition among purchasing factors of consumer are investigated as an important ones. Second, we analyzed a relationship between consumer's attitude about construction of agricultural-food production complex and factors which have an effect on construction of agricultural-food production complex i.e. labeling of origin, labeling of quality certification and reliability of quality certification labeling contents using Multiple Regression Analysis. As a result of analysis, the importance of factors is revealed in order of labeling of origin, labeling of quality certification, and reliability of quality certification labeling contents. If the agricultural-food production complex is constructed, a management for labeling of origin will be considered significantly. Third, the attitude about construction of agricultural-food production complex is investigated more positively agricultural-food companies than consumers. If agricultural-food production complex is constructed, an opinion of agricultural-food corporations should be reflected sufficiently. As a consequence, based on the result of this study, we presented a necessary procedure to construct an agricultural-food production complex.

국내 꽃 소비실태 분석을 통한 화훼산업 활성화 방안에 대한 연구

양주환,박노복,Yang, J.H.,Park, N.B. 국립한국농수산대학교 교육개발센터 2015 현장농업연구지 = Journal of practical agricultural resear Vol.17 No.1

Korean floricultural industry has grown under the full backing of government, as it placed itself as the main export item since 2000s. Despite its high-speed growth after the domestic production scale of trillion won, the floricultural industry lost its pace after 2005, due to the market-opening of agricultural product and global economic depression. Although the national income is growing and the level of civilized living is following, spending on flowers is faltering. As of such circumstances, necessity for analyzing flower consumption trend and behavior has came out, along with the calls for expansion plan of flower consumption, under the basis of result analysis on consumer reports. The result of the research contains the trend/consumption behavior analysis on domestic and foreign flower industry to boost floricultural industry, along with reviews on various studies of the developmental process of domestic and foreign cut-flowers/pot-plants consumption trend. Also this study has reached to the various recognition of people toward flower, through a public survey. Through such results, this study would like to propose the measures for diffusion of flower-consumption culture, achieving the improvement of life-quality of public along. First, efforts on reviewing the customer accessibility is essential to create flower- culture and the consumption. Second, to eliminate the obstacles that prevents flowers from public's daily life is essential. Third is the effective public-relations on flowers. To create consuming culture and to adhere the positive images, it is essential to research and systematically organize categories of color, scent, and elements of flower and utilize them. Last proposal is the organization of flower-concerned personnels and the leading groups. The change is affected by the economical, social environment, along with the emotions of consumers. Therefore the necessity for the leading group to be the control-tower of such changes are very clear.

Effects of piezoelectric constants and thickness of lead zirconate titanate ceramics on the performances of an inkjet printhead

양주환,김재훈,강윤성,박윤석,양충모,강필중,유영석,정재우 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.5

The effects of the piezoelectric constants and the thicknesses of lead-zirconate-titanate (PZT) ceramics on the performances of inkjet printheads have been investigated. To find the optimum actuator design of an inkjet printhead, we prepared bulk PZT samples with different piezoelectric coefficients and thickness. A soft and slim bulk PZT sample with a thickness of 50 μm showed the best results, with a displacement of 238 nm, a jetting speed of 11 m/s and a 32-pL drop volume at 95 V with a 30-μm nozzle diameter. The results suggest that a soft and thinner bulk PZT could be promising for piezoelectric application. In this paper, we analytically explain that the doped elements strongly influence the piezoelectric performances and that the thickness ratio of the piezoelectric layer to the Si substrate is a main factor in actuating and jetting performance.

농협 하나로마트 경영성과의 영향요인에 관한 연구

양주환 ( Joo Hwan Yang ),배이만 ( I Man Bae ),안성식 ( Sung Sik Ahn ),민승규 ( Seung Kyu Min ) 한국식품유통학회 2007 食品流通硏究 Vol.24 No.2

비대칭 다차원척도법과 순서분석을 이용한 호텔 서비스 상품의 속성구조 분석

양주환(Joo Hwan Yang),이장우(Jang Woo Lee),안성식(Sung Sik Ahn) 한국관광연구학회 2007 관광연구저널 Vol.21 No.2

PEG를 가소제로 사용한 장용성 연질캡슐의 코팅 품질 특성

양주환(Joo Hwan Yang),한준택(Joon Taek Han),오인호(In Ho Oh),박금덕(Geum Duck Park) 한국식품영양과학회 2015 한국식품영양과학회지 Vol.44 No.2

본 연구에서는 장용성 연질캡슐 코팅가소제로서 PEG(polyethylene glycol)의 활용가능성에 대하여 알아보고자 PEG의 분자량 및 첨가 농도에 따른 코팅 품질을 확인하였으며, 기존에 보고된 가소제인 AMG(acetylated monoglyceride)와 triacetin을 사용하여 코팅된 장용성 연질캡슐의 품질 특성을 비교하였다. PEG 분자량(400, 4,000, 6,000)에 따른 코팅 품질에는 큰 차이가 없었으나 PEG 첨가 농도의 경우 고형분 대비 5% PEG를 사용한 코팅에서는 연질캡슐피막 접착부에서 코팅 필름 갈라짐이 발생하였으며, PEG 첨가량이 낮을수록 인공장액에서의 붕해시간이 연장되고 백색도가 증가하는 결과를 나타내었다. 용출시험에서 용출의 초기 구간(30~90분)에서는 PEG의 용출 속도가 상대적으로 빠른 모습을 나타내었으며, PEG, AMG 및 triacetin 간의 유의적 차이가 일부 시점에서 관찰되었으나 전체적인 용출 양상은 큰 차이를 보이지 않았다. 또한 PEG 코팅에 비해 AMG와 triacetin 코팅의 경우 백색도가 유의적으로 높았고 가속조건인 고온다습한 환경에서 2개월간 보관 후에 코팅 필름이 갈라졌으며, 붕해시험에서 부적합한 결과를 확인하였다. 결론적으로 우수한 물리?화학적 특성으로 의약품 등에 널리 사용되는 첨가제인 PEG는 장용성 연질캡슐 코팅가소제로서 활용가능성이 충분하다고 판단하였다. We investigated the applicability of polyethylene glycol (PEG) as a plasticizer in enteric-coated soft capsules based on determination of quality characteristics according to molecular weight and concentration of enteric-coating PEG solution. There was no difference according to molecular weight of PEG, whereas a low PEG concentration in the enteric-coating solution was associated with higher whiteness index and slower disintegration time in pH 6.8 media. Brittleness was observed in the coating film at seam areas in 5% PEG enteric-coating solution after 2 weeks of storage at room temperature. The enteric-coating properties of PEG were compared with those of acetylated monoglyceride (AMG) and triacetin, which are enteric-coating plasticizers. Enteric-coated soft capsule containing PEG as a plasticizer showed a lower whiteness index and faster dissolution profile than AMG and triacetin. Moreover, enteric-coated soft capsule containing AMG and triacetin as plasticizers showed coating film brittleness at seam areas after 2 months of accelerated storage [40°C, relative humidity (RH) 75%] but no difference at room temperature storage (25°C, RH 60%). The present study suggests that concentration of PEG is important to determine enteric-coating quality, regardless of the molecular weight of PEG. In conclusion, PEG has potential as a plasticizer due to its transparency and storage stability in enteric-coated soft capsules.

원예치료, 작업치료, 미술치료 및 음악치료 관련 학술지에 게재 논문(2002-2011)의 연구 경향 분석 Related with Horticultural Therapy, Occupation Therapy, Art Therapy and Musical Therapy from 2002 to 2011

박윤점,유용권,오대민,구양규,정호용,양주환,蕭淑君,허북구 한국인간·식물·환경학회 2014 인간식물환경학회지 Vol.17 No.5

원예치료 연구 방향 설정에 필요한 자료 확보 측면에서 2002년 부터 2011년까지 원예치료, 작업치료, 미술치료, 음악치료 관련 학 회지에 게재된 논문 910편을 대상으로 연구유형, 대상자 및 프로그 램을 비교분석 하였다. 학술지 게재 논문은 2002년에 54편(5.9%), 2006년에는 84편(9.2%), 2011년에는 134편(14.7%)을 나타내어 대체치료 관련 연구가 증가하는 경향을 보였다. 연구 유형은 실험 연구가 많아 원예치료는 76.1%, 미술치료는 74.7%, 작업치료는 68.3%, 음악치료는 57.0%였다. 실험 논문에서 대상자의 증상은 원예치료 및 미술치료의 경우 정신지체장애인이 각각 32.6%, 11.4%로 가장 많았으며 작업치료는 뇌졸중이 24.8%, 음악치료는 우울증이 15.1%로 가장 많았다. 실험 논문에서 대상자의 성별은 여성이 52.1-55.1%로 많았으며, 연령은 19세 이하가 가장 많아 미 술치료는 49.5%, 음악치료는 47.2%, 원예치료는 44.2%, 작업치 료는 28.0%였다. 실험 논문에서 프로그램 당 대상자 수가 10명 이 하인 논문 편수 비율은 원예치료의 경우 59.3%, 미술치료는 72.9%, 음악치료는 58.5%였으며 작업치료는 36명 이상이 40.9% 였다. 실험 논문에서 프로그램 회기 수가 20회 이하인 비율은 원예 치료의 경우 64.0%, 작업치료는 44.0%, 미술치료는 76.2%, 음악 치료는 68.0%였다. 실험 논문에 사용된 측정 및 평가 도구의 사용 비율은 원예치료의 경우 자아존중감 측정지가 21.4%, 작업치료와 미술치료에서는 관찰일지가 각각 44.5%, 15.9%, 음악치료에서는 비디오 녹화가 21.3%로 가장 높았다. 이와 같이 대체 치료법에 따 라 특성 차이가 있으므로 적용 시는 이를 고려해야 할 것이다. comparative analysis a published papers based on 910 journal articles related with horticultural therapy, occupation therapy, art therapy, and musical therapy from 2002 to 2011. Journal published articles in 2002, 2006 and 2011 were indicated 54 papers(5.9%), 84 papers(9.2%) and 134 papers(14.7%), respectively and alternative treatment related with research was increasing trend. Research type was focussed mainly experimental research and horticultural therapy, art therapy, occupation therapy and music therapy showed 76.1%, 74.7%, 68.3% and 57.0% respectively. Symptom of participant in an experiment papers, mentally retarded person showed 32,6 % in horticultural therapy and 11.4% in art therapy, stroke 24.8% in occupation therapy and depression 15.1% in music therapy. The gender of participants in an experiment papers, females was shown 52.1-55.1%, and age was greatest below 19 year-old, 49.5% of art therapy, 47.2% of musical therapy, 44.2% of horticultural therapy and 28% of occupation therapy was done. Participants per program in an experiment papers, number of articles less than ten participants were shown 59.3% in horticultural therapy, 72.9% in art therapy and 58.5% in music therapy and occupation therapy was 40.9% more than 36 participants. Measurement of evaluation of the use of the tools of horticultural therapy was 21.4% in self-worth measurement, occupation and art therapy was 44.5% and 15.9% in observation journal, music therapy was 21.3% in video recording. According to alternative therapy, characteristic difference tends to exist and application time should be considered.