• 한국가정과교육학회지
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• 제17권4호
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• pp.157-173
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• 2005

본 연구의 목적은 중학교 2학년 가정교과의 '자원의 활용과 환경' 단원을 중심으로 Keller의 동기유발(ARES) 전략을 적용한 수업을 개발하고 실행하여 이 수업이 가정과 학습동기 및 가정교과태도에 효과를 주는 지를 알아보고 학습자의 성적수준 및 동기수준에 따라 가정과 학습동기와 가정교과 태도에 효과를 주는 지를 밝히는 데 있다. 본 연구의 실험설계는 이질 통제 집단 전후 검사 설계(Nonrandomized Control-Group Pretest-Posttest Design)이다. 본 연구 대상은 인천광역시 소재의 중학교 2학년으로 4개 학급 남학생 155명(실험집단 2학급 76명, 비교집단 2학급 79명)이다. 실험집단과 비교집단은 1학기말 가정교과 성적의 학급 평균이 비슷하고 통계적으로 유의미한 차이가 없는 학급으로 선정하였다. 수업 방법에 따른 효과 검증에서 교사 변인을 최대한 통제하기 위해 실험집단과 비교집단 수업을 한명의 가정과it사가 모두 진행하였다. 본 연구의 학습동기 검사도구는 Keller(1987)가 개발한 'The Course Interest Survey'를 박수경(1998)이 번안한 것을 본 연구의 목적에 맞게 수정$\cdot$보완하여 사용하였다. 교과에 대한 태도 검사도구는 이희애(2001)의 도구와 황옥주(2001)의 도구를 참고하여 연구자가 수정$\cdot$보완하여 개발하였다. 동기유발(ARCS) 전략을 적용하여 개발한 교수$\cdot$학습 과정안은 중학교 2학년 자원의 활용과 환경 단원으로 5차시에 해당하는 분량이다. 연구 결과는 다음과 같다. 첫째, 동기유발 전략을 적용한 가정과 수업은 전체 가정과 학습동기, 하위요소인 주의집중, 관련성, 자신감, 만족감 모두의 향상에 효과가 있었다. 둘째, 동기유발 전략을 적용한 가정과 수업은 학습자의 가정교과에 대한 태도 및 그 하위영역인 흥미도, 자신감의 향상에 효과가 있었다. 셋째, 동기유발 전략을 적용한 가정과 수업은 학습자의 성적수준이나 동기수준에 관계없이 강의식 수업보다 학습동기나 가정교과태도의 향상에 효과가 있었다.

• 대한공업교육학회지
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• 제38권2호
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• pp.89-113
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• 2013

본 연구에서는 미래 인력 수요 변화에 대하여 효율적 효과적으로 신속 대응하기 위해 가장 기본적으로 갖추어야할 학습자의 태도로 자발적으로 학습에 임할 수 있는 자세를 길러야 한다는 점에 주안점을 갖고 시작하였다. 이를 위해 어떤 외부적인 요인보다 자기학습능력 신장과 지속적인 학습동기 및 의지를 가질 수 있는 적절한 교수-학습 방법의 고안의 필요성과 특성화 고등학교에서 발생되는 여러 가지 수업관련 문제점들을 해결할 수 있는 수업 전략으로 모듈기반의 팀 보조 개별학습(이하, TAI) 모형을 적용하였다. 이를 통해 학습자의 흥미를 이끌어 내고, 학습 지속력을 높여보고자 하였다. 본 연구를 통하여 얻을 수 있는 결론은 다음과 같다. 첫째, 학습 단원을 모듈식으로 구조화하여 학습단계를 진행함으로써 학습적응 능력이 향상되었다. 성취기준(학습목표)은 교과 특성상 실무 현장과 교과 간 연계를 고려하여 교재를 분석하고 재구성하여 모듈식으로 구조화함으로써 모듈식 학습단계의 과정을 통해 단원의 특성 파악과 학습 적응 능력이 향상되었다. 둘째, 모듈 기반의 TAI 모형 적용을 통하여 자기주도적 학습능력과 현장 적응능력의 향상을 가져왔다. 모듈식 학습 방법을 적용하여 종래의 수동적인 학습 환경에서 벗어나 보다 능동적으로 학습하는 자기주도학습을 할 수 있었으며, TAI 모형과 협동학습의 접목으로 함께하는 수업에서의 흥미와 성취감, 자신감과 공동체 의식, 그리고 사고의 폭을 넓히는 계기를 갖게 되었다. 특히 자신감의 향상은 단순 기능 및 지식의 습득에서 벗어나 산업사회에서 요구되는 능력과 새로운 환경에 적응할 수 있는 능력을 길러주는데 효과적이다. 셋째, 산업현장과 관련된 보다 현장 중심적인 과제를 해결함으로써, 측량실기능력 향상뿐만 아니라 다양한 경험을 통하여 과제를 발견하고 해결하는 등 부가적인 능력 또한 신장되었다. 나아가 학생 스스로 자신의 생애와 학습에 대한 관심과 동기를 일으키고 새로운 지식과 기술이 급격하게 변화하는 직업세계에 적응할 수 있는 자질과 능력을 길러내는데 도움이 되었다. 넷째, 2012년부터 도입된 전문교과 성취평가제를 학습지도안 모형 구안에 적용하여, 보다 명료하고 객관화된 평가기준을 마련하였으며, 성취수준별 지도를 통해 개별적인 학습이 가능하도록 구상하였다. 이는 모둠별 협동학습의 단점을 보완하여 학습자 개인의 성취수준을 높이고, 일정 수준의 성취목표에 도달하는데 도움이 되었다.

• 한국지반환경공학회 논문집
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• 제13권9호
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• pp.5-16
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• 2012

원지반을 절토하여 생성된 토질재료를 입도조절 없이 곧바로 성토재료로 사용하는 경우, 성토의 설계나 밀도관리를 위해 필요한 다짐특성이나 재료정수는 실내시험을 통해 구하는 것이 바람직하며, 이에 대한 연구가 수행되어 왔다. 그러나 선행된 연구는 주로 자연상태에 존재하는 입경이 상이한 혼합재료에 관련된 것으로, 최근 건설재료로 활발히 연구되고 있는 화력발전소 부산물인 석탄회를 활용한 연구는 전무한 실정이다. 따라서 본 연구에서는 쇄석과 화력발전소에서 부산되는 저회를 혼합한 재료의 다짐에 의한 입자파쇄가 재료의 압축특성에 미치는 영향을 규명하기 위하여 다짐시험을 실시하여 기본적인 공학적 성질을 파악하였고, 일차원압축시험을 실시하여 다짐특성과 재료특성에 미치는 각 재료 혼합량의 영향을 파악하였다. 다짐시험 결과, 저회의 최적함수 비는 약 23%로 나타났고, 동일한 다짐에너지 및 함수비로 저회와 쇄석의 혼합비에 따른 다짐시험 결과 저회의 혼합율이 30%를 넘어서면 건조단위중량은 감소되는 경향을 나타내었고, 혼합율이 30%일 때 건조단위중량이 약 $1.81gf/cm^3$로 나타났다. 쇄석과 저회 의 혼합비에 따른 일차원압축시험 결과, 저회 100%의 경우 입자파쇄에 의한 간극비 변화가 가장 크게 나타났고, 쇄석 100%의 경우 가장 작게 나타났다. 쇄석과 저회 혼합재료의 경우, 저회 30%에서 압축지수가 가장 작게 나타나 혼합재료로서 공학적으로 가장 안정한 혼합비로 예상되었다.

• 성인간호학회지
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• 제12권2호
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• pp.234-244
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• 2000

It is widely recognized that manipulation of body position takes advantage of the influences of gravity for improving oxygenation. The study aims to determine the effects of positioning(supine, prone, right lateral decubitus and left lateral decubitus positions) applied to the mechanically ventilatory acute respiratory failure patients on arterial oxygen partial pressure($PaO_2$), alveolar arterial oxygen tension difference($AaDO_2$), mean aterial pressure, peak inspiratory pressure and plateau pressure. Thirty two acute respiratory failure patients admitted to the medical intensive care unit at Kangnam St. Mary's Hospital, The Catholic University of Korea from March 1997 to January 1998, were divided into three groups by radiographic evidence of unilateral or bilateral lung disease. In group 1 with dominant right lung disease were twelve subjects, group 2 with dominant left lung disease had eight subjects and group 3 had twelve subjects with bilateral lung disease. The variables were measured in 30 minutes after each position of supine, prone, good lung down lateral decubitus and sick lung down lateral decubitus position. The position order was done at random by Latin squre design. The results are as follows; 1) With group 1 patients, the $PaO_2$ in the left lateral decubitus and prone position were $126.8{\pm}30.8$ mmHg and $106.7{\pm}36.8$ mmHg, respectively(p=0.0001). 2) With group 2 patients, the $PaO_2$ in the prone and the right lateral decubitus position were $121.7{\pm}44.7$ mmHg and $118.5{\pm}31.7$ mmHg, respectively (p=0.0018). 3) With group 3 patients, the $PaO_2$ was $143.6{\pm}36.6$ mmHg in the prone position (p=0.0001). 4) With group 1 patients, the $AaDO_2$ in the left lateral decubitus and the right lateral decubitus position were $178.1{\pm}29.7$ mmHg and $233.1{\pm}24.4$ mmHg, respectively(p=0.0001). 5) With group 2 patients, the $AaDO_2$ in the prone and the left lateral decubitus postion were $184.0{\pm}39.5$ mmHg and $231.0{\pm}23.9$ mmHg, respectively(p=0.0019). 6) With group 3 patients, the $AaDO_2$ in the prone and the supine postion were $377.1{\pm}35.6$ mmHg and $435.7{\pm}13.1$ mmHg, respectively (p=0.0001). 7) There were no differences among the mean arterial pressure, peak inspiratory pressure and plateau pressure for each of the supine, prone, left lateral decubitus and right lateral decubitus position. The results suggest that oxygenation may improve in mechanically ventilatory patients with unilateral lung disease when the position is good lung dependent and prone, and patients with bilateral lung disease when the position is prone without any effects on the mean arterial pressure and airway pressure. It is suggested that body positions improve ventilation/perfusion matching and oxygenation need to be specified in patient care plans.

• Asia pacific journal of information systems
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• 제22권4호
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• pp.75-99
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• 2012

Innovation can come from inside or outside organizations. Recently, organizations have begun turning to external knowledge more often, through various forms of collective intelligence (CI) as collaborative platform to solve complex problems. Several factors facilitate this CI utilization phenomenon. First, with the rapid development of Internet and social media, numerous web applications have become available to millions of the Internet users over the past few decades. Web 2.0 and social media have become innovative web applications that provide an environment for human social interaction and collaboration. Second, the diffusion of simple and easy-to-use technologies that enable users to interact and design web applications without programming skills have led to vast, previously unknown amounts of user-generated content. Finally, the Internet has enabled communities to connect and collaborate, creating a virtual world of CI. In this study, web enabled CI is defined as a composed ability of individuals who are acting as a single cognitive unit to achieve common goals, think reasonably, solve problems, make decisions, carry out complex tasks, and develop creative ideas collectively through participation and collaboration on the web. Although CI plays a critical role in organizational innovation and collaboration, the dubious quality of CI is still problem that is difficult to solve. In general, the quality level of content collected from the crowd is lower than that from professionals. Thus, it is important to identify determinants of CI quality and to analyze the relationship between CI quality and its usefulness. However, there is a lack of empirical study on the quality factors of web-enabled CI. There exist a variety of web enabled CI sites such as Threadless, iStockphoto or InnoCentive, Wikipedia, and Youtube. One of the most successful forms of web-enabled CI is the Wikipedia online encyclopedia, accessible all over the world. Another one example is Naver KnowledgeiN, a typical and popular CI site offering question and answer (Q&A) services. It is necessary to study whether or not different types of CI have a different effect on CI quality and its usefulness. Thus, the purpose of this paper is to answer to following research questions: ${\bullet}$ What determinants are important to CI quality? ${\bullet}$ What is the relationship between CI quality factors and the usefulness of web-enabled CI? ${\bullet}$ Does CI type have a moderating effect on the relationship between CI quality, its determinants, and CI usefulness? Online survey using Google Docs with email and Kakao Talk was conducted for collecting data from Wikipedia and Naver KnowledgeiN users. A totoal of 490 valid responses were collected, where users of Wikipedia were 220 while users of Naver KnowledgeiN were 270. Expertise of contributors, community size, and diversity of contributors were identified as core determinants of perceived CI quality. Perceived CI quality has significantly influenced perceived CI usefulness from a user's perspective. For improving CI quality, it is believed that organizations should ensure proper crowd size, facilitate CI contributors' diversity and attract as many expert contributors as possible. Hypotheses that CI type plays a role of moderator were partially supported. First, the relationship between expertise of contributors and perceived CI quality was different according to CI type. The expertise of contributors played a more important role in CI quality in the case of Q&A services such as Knowledge iN compared to wiki services such as Wikipedia. This implies that Q&A service requires more expertise and experiences in particular areas rather than the case of Wiki service to improve service quality. Second, the relationship between community size and perceived CI quality was different according to CI type. The community size has a greater effect on CI quality in case of Wiki service than that of Q&A service. The number of contributors in Wikipeda is important because Wiki is an encyclopedia service which is edited and revised repeatedly from many contributors while the answer given in Naver Knowledge iN can not be corrected by others. Finally, CI quality has a greater effect on its usefulness in case of Wiki service rather than Q&A service. In this paper, we suggested implications for practitioners and theorists. Organizations offering services based on collective intelligence try to improve expertise of contributeros, to increase the number of contributors, and to facilitate participation of various contributors.

• Journal of Animal Science and Technology
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• 제47권4호
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• pp.547-554
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• 2005

본 연구는 메주에서 순수 분리된 메주곰팡이의 대표적 균종인 황국균(Aspergillus oryzae; AO)으로 만든 AO culture와 Salmonella 병원특이 유전자를 삽입한 형질전환 AO(TAO) culture가 산란계의 생산성, 계란 품질 및 장내 미생물 균총에 미치는 영향을 규명하고자 실시하였다. 39주령 산란계 Hy-line Brown 840수를 공시하여 대조구, AO culture 0.2%와 0.5%, TAO culture 0.2%와 0.5%, UV를 조사하여 단백질 분해효소를 감소시킨 mutant에 Salmonella 병원 특이 유전자를 삽입한 형질전환 AO(TMAO) culture 0.2%와 0.5% 첨가구들을 비교하였다. 각 첨가구는 6반복, 반복당 20수씩, 한 케이지 당 2수씩 배치하여 8주간 사양시험을 실시하였다. 사양시험 결과 모든 산란 생산성 및 계란 품질 관련 조사항목에서 처리간에 유의한(P<0.05) 차이가 있었다. TAO culture 0.2% 첨가구가 산란 생산성에 있어서 유의적으로 가장 높았으며, 난중은 모든 AO 첨가구들이 대조구에 비해 유의적으로 낮거나 낮아지는 경향을 나타내었다. 연파란율은 TMAO culture 0.5% 첨가구가 가장 낮았다. 사료섭취량과 사료요구율은 대조구와 모든 AO 첨가구들간에 유의적 차이가 나타나지 않았다. 난각 강도는 대조구 보다 모든 AO 첨가구들에서 유의적으로 높게 나타났으며, 난황 색도는 TMAO culture 0.5% 첨가구에서 가장 높았다. 난각 색도와 Haugh unit은 대조구와 모든 AO 첨가구들간에 유의적 차이가 나타나지 않았다. 장내 미생물 균총(Salmo- nella spp., E. coli. Lactobacilli spp.)에서는 유의적(P<0.05) 차이가 있었다. AO culture 첨가에 의해서 Lactobacilli spp.의 수는 증가되고, E. coli 및 Salmonella spp.의 수는 감소되었다. 특히 TAO와 TMAO culture 첨가구에서는 AO culture 첨가구보다 Salmonella spp. 및 E. coli 억제효과가 컸으며 첨가수준(0.5% vs 0.2%) 간에는 유의한 차이가 없었다. 결론적으로 TAO culture 0.2% 첨가는 산란 생산성 증가에 효과가 있었으며 TAO 및 TMAO culture 0.2% 첨가는 장내 E. coli 및 Salmonella spp.의 감소에 유의한 효과가 있었다.

• 한국해양환경ㆍ에너지학회지
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• 제10권3호
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• pp.127-137
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• 2007

전기분해 염소소독기로 처리한 결과가 국제해사기구의 협약에서 제시한 생물처리 기준(D-2 regulation)을 만족하는지 확인하기 위해 박테리아, 식물플랑크톤($10-50\;{\mu}m$) 및 동물플랑크톤($>50\;{\mu}m$)의 사멸효과를 확인하였다. 실험조건은 대조구와 잔류염소농도 10 ppm(Expt. 1)과 30 ppm(Expt. 2)을 실험구로 설정하였고, 시험수를 $23.8\;m^3/hr$의 속도로 전기분해염소독기에 통과시켰다. 시험수의 생물조건은 국제해사기구에서 작성된 선박 평형수 관리 장치의 승인을 위한 지침서에서 제시한 기준을 따랐다. 식물플랑크톤의 생사판별은 광학현미경, 형광현미경 및 형광측정기(Turner Designs 10-AU)를 이용하여 확인되었다. 두 농도 조건(10 ppm, 30 ppm)의 처리수에서 운동성이 있는 식물플랑크톤은 움직임이 나타나지 않았고, 형광현미경 하에서 엽록소 형광색이 적색에서 녹색으로 바뀌었으며, 형광값은 고농도(Expt. 1: 6.95, Expt. 2: 7.11)에서 0으로 바뀌었다. 이는 식물플랑크톤의 활성이 상실되어 모두 사멸되었음을 의미한다. 동물플랑크톤의 생사판별은 해부현미경하에서 부속지의 움직임을 토대로 결정되었다. 전기분해 염소소독기 처리 후 해양환경에서 채집되어 농축된 자연군집 동물플랑크톤은 모두 사멸되었으나, 일부 Artemia가 생존하였다. 그러나 각 잔류염소 농도조건의 암소에서 노출시킨 지 24시간 뒤에는 모든 동물플랑크톤이 사멸되었다. 박테리아는 Petrifilm plates($3M^{TM}$)를 이용한 접종배양법으로 처리수의 총 세균, 대장균 군 및 대장균의 사멸효과를 확인한 결과, 균주가 전혀 관찰되지 않았다. 또한 각 염소농도 조건의 처리수에서 추가적으로 노출시킨 5일 동안 세 그룹의 생물에서 재성장이 나타나지 않았다. 본 연구결과는 세 그룹의 생물에 대한 전기분해염소소독기 처리결과가 국제해사기구에서 제정한 선박 평형수 배출기준을 만족시켰음을 보여주었다.

• 가정∙방문간호학회지
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• 제8권1호
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• pp.5-24
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• 2001

The purpose of this study was to develop a parenting intervention program and determine the efficacy of the program with low-birth weight infants and their mothers. Nine dyads for the experimental group and twelve dyads for the control group discharged from the Neonatal Intensive Care Unit of a University Hospital in Seoul were recruited for the study. For the intervention group, programmed education and support which focused on the maternal sensitivity of the infant's behavior. rearing environment. motherinfant interaction and infant care were given to each subject. Individual counseling and home visits were provided at discharge, one week after discharge. and one and three months of corrected age in every infant. Structured questionaires were administered and feeding interactions were videotaped and coded by a blinded certified observer. A Quasi-experimental design was conducted for this study. Postpartum depression, maternal self esteem. infant care burden, HOME. mother-infant interaction, and infant development were measured. Results were in favor of the intervention versus the control group. On the Beck depression inventory, intervention mothers showed decreasing trends in depressive symptom vs control mothers although, there were statistically no significant differences between the two groups at each time. The mean score of experimental group was 11.55(mild depression state) at discharge and became 8,6(normal state) at 1 month of corrected age. On the other hand, the mean score of the control group was 13.92(mild depression state) at discharge and became 14.0. Maternal self esteem in both groups improved over time. Infant care burden in both groups was also shown to increase over time. There was a significant difference between the two groups in HOME(p=.0340) at 3 months of corrected age. HOME scores of the experimental group and the control's were 31.10 and 25.58, respectively. Mothers' emotional and language responses were significantly high in the intervention group compared with the control group(p=.0155). Intervention group (53.33) showed a significantly high quality of motherinfant interaction compared with the in control group (42.80)(p =.0340). Intervention group mothers appeared have a better quality of mother-infant interaction behaviors. On the other hand, there was no statistical difference in the infant part between groups. Intervention group infants had higher trends in a general developmental quotient: although, there was no statistical difference between groups. The general developmental quotient of intervention infants was 102.56 and control's was 91.28. However, the developmental quotient of the domain of 'individuality-sociality' was higher in the intervention group infants compared with the control's(p=.0155). The concerns identified by parents revealed two domains of an infants' health management -knowledge and skills in caregiving of lowbirthweight-infants, characteristics of lowbirthweight infants, identifying a developmental milestone, coping with emergency situations and relaxation strategies of mothers from the infant care burden. Interview data with the mothers of low-birth weight infants can be used to develop intervention program contents. Limited intervention time and frequency due to time and cost limitations of this study should be modified. The intervention should be continuously implemented when low-birth weight infants become three years old. An NNNS demonstration appeared to be a very effective intervention for the mothers to improve the quality of mother-infant interactions. Therefore intervening in the mothers of low-birth weight infants as early after delivery as possible is desirable. This study has shown that home visit interventions are worthwhile for mothers only beyond the approach as an essential factor in ability of facilitating a growth fostering environment. In conclusion. the intervention program of this study was very effective in enhancing the parenting for the mothers of low-birth weight infants, resulting in health promotion of low-birth weight infants. The home-visit outreach intervention program of this study will contribute to the health delivery system in this country where there is a lack of continuous follow-up programs for low-birth weight infants after discharge from NICU, if it is activated as part of the home visit programs in community health systems.

• 농업과학연구
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• 제14권1호
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• pp.98-133
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• 1987

The mechanical and rheological properties of agricultural materials are important for engineering design and analysis of their mechanical harvesting, handling, transporting and processing systems. Agricultural materials, which composed of structural members and fluids do not react in a purely elastic manner, and their response when subjected to stress and strain is a combination of elastic and viscous behavior so called viscoelastic behavior. Many researchers have conducted studies on the mechanical and rheological properties of the various agricultural products, but a few researcher has studied those properties of rice plant, and also those data are available only for foreign varieties of rice plant. This study are conducted to experimentally determine the mechanical and the rheological properties such as axial compressive strength, tensile strength, bending and shear strength, stress relaxation and creep behavior of rice stems, and grain detachment strength. The rheological models for the rice stem were developed from the test data. The shearing characteristics were examined at some different levels of portion, cross-sectional area, moisture content of rice stem and shearing angle. The results obtained from this study were summarized as follows 1. The mechanical properties of the stems of the J aponica types were greater than those of the Indica ${\times}$ Japonica hybrid in compression, tension, bendingand shearing. 2. The mean value of the compressive force was 80.5 N in the Japonica types and 55.5 N in the Indica ${\times}$ Japonica hybrid which was about 70 percent to that of the Japonica types, and then the value increased progressively at the lower portion of the stems generally. 3. The average tensile force was about 226.6 N in the Japonica types and 123.6 N in the Indica ${\times}$ Japonica hybrid which was about 55 percent to that of the Japonica types. 4. The bending moment was $0.19N{\cdot}m$ in the Japonica types and $0.13N{\cdot}m$ in the Indica ${\times}$ Japonica hybrid which was 68 percent to that of the Japonica types and the bending strength was 7.7 MPa in the Japonica types and 6.5 MPa in the Indica ${\times}$ Japonica hybrid respectively. 5. The shearing force was 141.1 N in Jinju, the Japonica type and 101.4 N in Taebaeg, the Indica ${\times}$ Japonica hybrid which was 72 percent to that of Jinju, and the shearing strength of Taebaeg was 63 percent to that of Jinju. 6. The shearing force and the shearing energy along the stem portion in Jinju increased progressively together at the lower portions, meanwhile in Taebaeg the shearing force showed the maximum value at the intermediate portion and the shearing energy was the greatest at the portion of 21 cm from the ground level, and also the shearing strength and the shearing energy per unit cross-sectional area of the stem were the greater values at the intermediate portion than at any other portions. 7. The shearing force and the shearing energy increased with increase of the cross-sectional area of the rice stem and with decrease of the shearing angie from $90^{\circ}$ to $50^{\circ}$. 8. The shearing forces showed the minimum values of 110 N at Jinju and of 60 N at Taebaeg, the shearing energy at the moisture content decreased about 15 percent point from initial moisture content showed value of 50 mJ in Jinju and of 30 mJ in Taebaeg, respectively. 9. The stress relaxation behavior could be described by the generalized Maxwell model and also the compression creep behavior by Burger's model, respectively in the rice stem. 10. With increase of loading rate, the stress relaxation intensity increased, meanwhile the relaxation time and residual stress decreased. 11. In the compression creep test, the logarithmic creep occured at the stress less than 2.0 MPa and the steady-state creep at the stress larger than 2.0 MPa. 12. The stress level had not a significant effect on the relaxation time, while the relaxation intensity and residual stress increased with increase of the stress level. 13. In the compression creep test of the rice stem, the instantaneous elastic modulus of Burger's model showed the range of 60 to 80 MPa and the viscosities of the free dashpot were very large numerical value which was well explained that the rice stem was viscoelastic material. 14. The tensile detachment forces were about 1.7 to 2.3 N in the Japonica types while about 1.0 to 1.3 N in Indica ${\times}$ Japonica hybrid corresponding to 58 percent of Japonica types, and the bending detachment forces were about 0.6 to 1.1 N corresponding to 30 to 50 percent of the tensile detachment forces, and the bending detachment of the Indica ${\times}$ Japonica hybrid was 0.1 to 0.3 N which was 7 to 21 percent of Japonica types. 15. The detachment force of the lower portion was little bigger than that of the upper portion in a penicle and was not significantly affected by the harvesting period from September 28 to October 20. 16. The tensile and bending detachment forces decreased with decrease of the moisture content from 23 to 13 percent (w.b.) by the natural drying, and the decreasing rate of detachment forces along the moisture content was the greater in the bending detachment force than the tensile detachment force.

• Journal of Animal Science and Technology
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• 제49권4호
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• pp.481-490
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• 2007

본 시험은 대조구, 항생제 처리구:Avilla- mycin?? 6ppm, MOS 처리구:MOS 250ppm, lectin 처리구:Mannosespepecific lectin 12.5ppm, Organic acid F 처리구:FORMI??(formic acid 35.4%, formate 34.6%, potassium 30.0%) 0.3%, Organic acid G처리구: GALLACID?? 0.06% 등 6처리구를 두고 이들 처리가 산란계에 미치는 영향을 비교 평가하기 위하여 생산성, 혈액성상, 혈청 IgG, 장내 미생물 균총을 조사하였다. 사양시험은 48주령의 산란계(Hy-Line Brown??) 900수를 선별하여 6처리, 5반복, 반복당 15케이지, 케이지당 2수씩 A형 2단 케이지에 수용하고 randomized block design으로 배치하였다. 6주 동안의 산란율(hen-day, hen- house egg production)에서는 MOS 처리구가 가장 높은 산란율을 보였고 모든 첨가구가 대조구보다 산란율이 높았다(P<0.05). 난중은 lectin 처리구가 가장 높았으며 모든 첨가구들이 대조구보다 높은 경향이 있었다. 연파란율은 lectin 처리구를 제외한 모든 첨가구들이 대조구보다 낮았다(P<0.05). 난황색은 Organic acid G 처리구를 제외한 모든 첨가구들이 대조구보다 높았다(P<0.05). Haugh unit는 lectin 처리구가 가장 높았으며 모든 첨가구들이 대조구보다 높았다. Leukocytes 중 SI는 lectin 처리구가 가장 높았다(P<0.05). Erythrocytes 중 RBC, HB, MCHC는 lectin 처리구가 가장 높았으며 MOS 처리구가 가장 낮았다(P<0.05). 장내 미생물에서는 처리구간에 유의적인 차이는 없었으나 Lactobacilli 수는 대조구보다 첨가구들이 높은 경향이 있었고 Cl. perfringens 수는 Organic acid F를 제외한 모든 첨가구들이 대조구보다 낮은 경향이 있었다. 혈청 IgG 농도는 MOS 처리구가 가장 높았으며 모든 첨가구들이 대조구보다 유의적으로 높았다(P<0.05). 결론적으로 본 시험에서 사용된 면역조절제(MOS, Lectin)와 유기산제는 산란계에서 항생제(Avilamycin??)와 유사한 생산성을 나타내어 항생제 대체제로서 산란계의 생산성을 효과적으로 개선 할 수 있으며 특히 이중에서 MOS의 생산성 개선효과가 가장 높았다.