TiNi/Al6061 형상기억복합재료의 고온에서의 손상거동에 대한 AE 특성

이진경,박영철,구후택 한국비파괴검사학회 2002 한국비파괴검사학회지 Vol.22 No.1

금속복합재료(MMC) 내부에서의 강화재와 기지재사이의 열팽창계수의 차이에 의해 발생하는 인장잔류응력은 복합재료의 인장강도를 저하시키는 심각한 문제중의 하나이다. 따라서 본 연구에서는 TjNi/Al6061 형상기억복합재료내부의 인장잔류응력의 문제를 해결하기 위하여 강화재로써 TiNi 합금을 사용하였다. TiNi 합금은 형상기억효과를 이용하여 복합재료내부에 압축잔류응력을 발생시킴으로써 인장강도를 증가시키는 역할을 한다. 복합재료내부에 압축잔류응력을 발생시키기 위하여 예변형(pre-strain)을 가하였다. 본 연구에서는 예변형의 변화에 따른 압축잔류응력의 영향을 평가하였으며 AE 기법을 이용하여 고온에서의 복합재료의 미시적 손상거동과 예변형의 영향을 평가하였다. It has been known that tensile residual stresses occurring by the thermal expansion coefficient mismatch between fiber and matrix is a cause of the weak strength of metal matrix composites(MMCs). In order to solve this problem, TiNi alloy fiber was used as a reinforced material in TiNi/Al6061 shape memory alloy composite in this study. TiNi alloy fiber improves the tensile strength of the composite by causing compressive residual stress in matrix on the basis of its shape memory effect. Pre-strain was imposed to generate the compressive residual stresses inside the TiNi/Al6061 shape memory alloy composites. AE technique was used to quantify the microscopic damage behavior of the composite at high temperature. The effect of applied pre-strains on the AE behavior was also evaluated.

가족생활교육 프로그램의 개발에 관한 연구 동향 분석

장진경,원소연 숙명여자대학교 건강·생활과학연구소 2006 生活科學硏究誌 Vol.- No.22

Korean society with low fertility rate and high divorce rate crisis has been tried very hard to find out alternatives to solve these social problems. These efforts resulted in increasing the development of family life education programs. One of the characteristics for family life education is multidisciplinary so that family life education programs have been development in various different academic fields. Therefor, this is the time to establish database for family life education programs which were developed so far. The purpose of this study is to examine research trend in the field of family life education programs in Korea. For this purpose, 228 family life education programs developed during the last 10 years were analyzed. Frequencies, percentages were used for this analysis. The results of this study were as followed: First, family life education programs were very actively developed in Home Management field compared to other academic fields such as Social Work, Education, Psychology, and so on. Second, in terms of family life education program subjects, a family dynamics subject was mainly used. Third, with program participative, most family life education programs were focused on participants in early adulthood and families with childbearing. Finally, with respect to the fact that whether or not effective study was published, 71.5% of family life education programs had effective study results.

21세기 기독교 지도사상

정진경 국제기독교언어문화연구원 1999 기독교언어문화논집 Vol.3 No.-

오늘의 우리 세대는 하나님을 진실하게 믿는 기독교 지도자들이 나타나기를 기대하고 있다. 기독교 지도자와 세상의 지도자는 그 의미가 다르다. 세상의 지도자는 자신의 철학과 사상에 기초를 두고 있지만 기독교 지도자는 하나님의 소망과 그리스도께서 명하신 대사명(The Great Commission)에 근거한다. 그러므로 기독교 지도자는 개개인의 인격이나 전문적인 직업 등에 관계없이 모든 기독교 지도자들의 공통된 사명은 그리스도께서 위임하신 대사명을 수행하므로 하나님의 나라를 세우는 것이다.

일개 종합병원중심 가정간호 간호진단분류를 위한 NANDA와 HHCC의 적용 비교

이진경,박현애 성인간호학회 2000 성인간호학회지 Vol.12 No.4

Application of NANDA and HHCC to Classification of Nursing Diagnosis in a Hospital-Based Home Health Care This study examines that Noith American Nursing Diagnosis Association(NANDA) and Home Health Care Classification(HHCC) is appropriate to classify home health care client's nursing problems and suggests a modified nursing diagnosis classifcation system. Two hundred and forty-nine clients' records at a general hospital were reviewed and nursing problems were diagnosed according to each classification system. Results of this study are as follows. The major client's medical diagnosis are pregnancy, childbirth and puerperium. malignant neoplasm, and benign neoplasm. Of four hundred and sixty-three nursing problems, all nursing problems made a diagnos according to HHCC, while three hundred and eighty-five made a diagnosis according to NANDA. The HHCC diagnosis included 78 more nursing problems than NANDA The discrepancy in the results may indicate a significant advantage to HHCC diagnosis because HHCC nomenclature was created empirically from hard data. However, this may be due to limitations in the data collection method so determination of which classification system is more useful is difficult to judge. However, nursing components of the HHCC are more concrete and clearer than human response patterns of the NANDA. Also the HHCC facilitates the documentation of Patient care by computer, while using a conceptual framework consisting of 20 Care Components based on the nursing process: assessment, diagnosis, outcome identification, planning, implementation and evaluation. Accordingly, the practical application of HHCC is more useful than NANDA. Limitations of this study include a retrospective data collecting method and universality of samples. Further research for various samples that use prospective data collection method is recommended.

머리의 위치변화에 따른 파노라마방사선 사진상에서의 상악동 및 인접조직의 평가

이진경,김재덕 大韓口腔顎顔面 放射線學會 1992 Imaging Science in Dentistry Vol.22 No.2

The purpose of this study was to evaluate the utilization of the orthopantomograph as diagnostic aid to observe maxillary sinus and adjacent structures. For achieving this goal, the lead plates were attached to the five walls of the maxillary sinus of a human dry skull. The dry skull was placed in fourteen different positions : standard, 20mm forward, 20mm backward, 10 degree upward, backward & downward & lateral, upward & lateral, downward &lateral position The obtained results were as follows ; 1. The image of the medial wall was observed very differently according to the head position. 2. The image of the anterior wall was observed at medial third to half of the maxillary sinus in each head position. 3. The image of the posterior wall was always observed at lateral third of the maxillary sinus in all head positions and more obviously in the downward-lateral position. 4. The image of the superior wall was observed at the inferior third to half of the orbit in each head position. 5. The image of the inferior wall was always observed at the inferior third of maxillary sinus in all head positions and observed more obviously in the standard and downward-lateral positions. 6. The image of the zygomatic process, zygomatic arch and zyomaticotemporal suture were observed very well in the downward-lateral position.

Sort Root Anomaly에 관한 증례

박진경,양규호 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.2

Short roots in maxillary central incisors have been described as those with a root/crown ratio of less than 1.6. The prevalence of short rooted central incisor is 2.4-2.7%. The short root anomaly always affects both central incisors almost symmetrically. Other teeth are more rarely involed, and when they are, it is usually premolars and canines which are affected. Generalized Short Root Anomaly is extremly rare, and the pathogenesis of this condition is uncertain. The condition of short root anomaly produce no clinical symptoms except that in severe cases the central incisors may be somewhat loose. Therefore, the principal long-term aim of treatment is to prevent the teeth loss from caries or periodontal disease, and especially in anterior teeth, thus attempts should be made to protect the teeth from factors capable of eliciting root resortption.

동조배양에 의한 Chlorella ellipsoidea의 Ribulose 1, 5-Bisphosphate Carboxylase와 Phosphoenolpyruvate Carboxylase활성도에 미치는 IAA와 GA_3의 효과

이진경,이종삼 誠信女子大學校 1990 硏究論文集 Vol.30 No.1

생활사에 따른 Cholrella ellipsoidea의 Ribulose 1,5-bisphosphate carboxylase(RuBPCase)와 Phosphoenolpyruvate carboxylase(PEPCase)의 활성도에 미치는 IAA와 GA_3의 효과를 규명하기 위하여 IAA(10^-5M)와 GA_3(2×10^-8M)를 처리한 M4N배지에서 동조배양하였다. RuB-PCase와 PEPCase활성도는 340nm에서 NADH가 산화되는 비율로 구하였다. 생장율과 세포크기, 세포수등은 IAA처리구와 GA_3처리구가 대조구에 비하여 촉진되었음을 관찰할 수 있었다. 총단백질량도 대조구보다 IAA와 GA_3처리구에서 증가되었으며, 시기별로는 L시기보다 D시기에서 단백질합성이 촉진됨을 볼 수 있었다. RuBPCase의 활성도는 PEPCase의 활성도에 비하여 현저히 높게 나타났으나, PEPCase도 식물호르몬에 매우 민감하게 활성도가 증가되는 경향을 나타내었다. 또한 이들의 활성도는 division기간보다 ripening기간에서 뚜렷한 증가를 관찰할 수 있었다. 이러한 결과는 division기간보다 ripening기간에서 세포내의 대사작용과 광합성과정이 더욱 활발히 수행되는 것으로 추정된다. In order to observe the effects of IAA and GA_3 on the activities of RuBPCase and PEPCase in Chlorella ell??psoidea during the synchronous culture, the cells cultured in media treated with IAA(10^5M) and GA_3(2¡¿10_-8M). The activities of RuBPCase and PEPCase were assayed by measuring the oxidation of NADH to NAD at 340nm, 25¡E. The growth rate of Chlorella cells which was treated with IAA and GA_3 were promoted in comparison with the rate of the control. The content of total protein in the cells was more increased in the ripening phase than the division phase during the developmental stages In the cells. The activities of RuBPCase and PEPCase were more increased in treated with IAA and GA_3 than those of the control. RuBPCase and PEPCase were more increased in D stage than L stage during the synchronous culture. It was shown that photosynthetic activity and metabolism in the cells were more increased in ripening phase than in the division phase during the life cycle.

서울市內 井戶水의 鹽素要求量에 關한 硏究

申暻鎭 서울大學校 保健大學院 1968 公衆保健雜誌 Vol.5 No.2

The chlorination sanitarily gives the drinking water completely purified by the chlorine titrated in an accurate measurement to the well water. This investigation had been carried out to observe how much chlorine demand would be measured for the drinking water, from Apr. 15, 1968 to Sept. 30, 1968, bases on the 101 cases of wells that the people in Seoul could not help using wells by the non-water supply. From the test precedure used this investigation pH value related to the chlorine demand, the amount of KMnO₄consumed and NH₃-N resulted altogether as the following : 1. The water temperature showed that 93 cases or 93.1% out of 101 cases were under 12℃ and the rest, 7 casts or 6.9%, were higher than 12℃. 2. The accurate survey of pH value revealed that 91 cases or 90.0% out of 101 cases were neutral as 6. 5∼7.5, 3 cases or 3.0% less than 6.5 and 7 cases or 7.0% more than 7.5. 3. The discriminate survey of Ammonia-Nitrogen revealed that 20 cases or 19.8% out of 101 were positive. 4. The amount of KMnO₄consumed denoted that 60 cases or 59.3% were less than 2.0 ppm and 95 cases or 94.0% less than 4.0 ppm, in each, out of 101, but the case prescribed with that of more than 10.0 ppm in Korean drinking water standards was only within the limit of 1 case or 1.0% of the all. 5. The chlorine demand presented after an-contact time-hour revealed that 78 cases or 77.1% were less than 0.5 ppm. 93 cases or 92.0% less than 1.0 ppm and 8 cases or 8.0% 1.1∼2.0 ppm in each. Most of 8 cases or 8.0% out of 101, however, were the wells in the slum area in Seoul. 6. The interrelation between pH value(r₁) and the amount of KMnO₄consumed(r₂) revealed that they were in the positive correlation from the coefficient of it equated by the following general mathematical expression r₁.₂=0.34 ; p<0.01. 7. The interrelation of which had been done among pH value (r₁), the amount of KMno₄consumed(r₂) and the chlorine demand(r₃) was also in the same positive correlation from the coefficient of it as shown as r₁.₂.₃=0.34 and p<0.01.

제산제 탄산수산화마그네슘의 최적 제조조건 추구 및 분체학적 성질

남진경,이계주 충남대학교 약학대학 의약품개발연구소 1999 藥學論文集 Vol.15 No.-

Magnesium carbonate hydroxide (hydrotalcite) was synthesized to pursue the optimum conditions having the highest acid consuming capacity by a Box-Wilson experimental design, and micromeritical properties of samples were evaluated by laser particle size analyzer, SRD, BET system, mercury porosimeter, and several adsorption capacity test. The optimum preparation conditions for hydrotalcite were as followwws: concentration of aluminum hydroxide and magnesium hydroxide 1.17mole, reaction temp. 82.6℃, reaction time 2.32hr, ratio of (Al(OH)_3/Mg(OH)_2 4.25, drying temperature 93.2℃ respectively, and its acid consuming capacity was 286ml/g. the neutralization curve shows that sample whose acid consuming capacity was the highest has the best neutralizing capacity and duration capacity. The crystalline form of the synthesized hydrotalcite was identified with a hexagonal system, and the d (003) spacing value of three samples was large. a part of alumina crystal form was shown at 2θ=18°, 38° in sample 3. The micromeritical properties of the synthesized hydrotalcite has no relation with an acid consuming capacity, and there was a tendency that the higher the acid consuming capacity is the larger the particle size and the narrower the size distribution. The values of pore invasive volume, pore area and specific surface area of sample 1 were small among three samples. Isotherm by BET system forms hyteresis loop and it shows the synthesized hydrotacite was porous. the pore diameter was about 10Å and it verifies mesopore. The adsorption capacity measured by methylene blue has no relation with acid consuming capacity. The adsorption of quinine sulfate in aqueous solutuion was identical with the Langmuir isotherm.

형상기억복합재료에 대한 온라인 모니터링 시스템 개발

이동화,박영철,이민래,이동화,이규창 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.1

형상기억복합재료를 제조하기 위하여 핫프레스 방법을 이용하여 최적의 제조조건을 도출하였으며 냉간압연에 의해 기지재와 강화재의 계면접합을 강화하여 강도를 증가시켰다. 이러한 방법에 의해 제조된 형상기억복합재료에 대하여 외부 하중에 의한 손상정도와 균열의 발생을 감지하여 균열 발생 및 진전을 억제하는 온라인 모니터링 시스템을 개발하고자 한다. 이를 위하여 음향방출 신호의 파라미터를 이용하여 손상에 따른 최적의 AE 파라미터를 도출하였으며 가열시스템을 이용하여 형상기억합금을 가열함으로써 형상기억합금의 수축에 의한 복합재료 내부에 균열진전을 억제시키는 시스템을 개발하였다. A hot press method was use for the optimal manufacturing condition for a shape memory alloy(SMA) composite. The bonding between the matrix and the reinforcement within the SMA composite by the hot press mothod was strengthened by cold rolling. In this study, the objective was to develop an on-line monitoring system for the prevention of the crack initiation and propagation by shape memory effect of SMA composite. Shape memory effect was used to prevent the SMA composite from cracking. For the system to be developed, an optimal AE parameter should be determined based on the degree of damage and crack initiation. When the SMA composite was heated by the plate heater attached at the composite, the propagating cracks appeared to be controlled by the compressive force of SMA.