칠레의 과수산업 경쟁력과 향후 교역전망

어명근,최지현,최윤국 한국농업정책학회, 한국축산경영학회 2000 농업경영정책연구 Vol.27 No.2

According to the measurement of Revealed Competitive Advantage (RCA) indices, relative competitiveness for grapes, plum, kiwi, pears and apples were higher than any other Chilean agricultural products. Climatic and geological conditions, market oriented agricultural polities as well as the plantational structure and development of processing, marketing and logistic systems for export were the sources of competitiveness of Chilean fruit industry. Export of Chilean fruits toward Korea would steeply increase as Korea-Chile free trade agreements are come into effects. Small-sized Korean fruit farmers should lower the costs and raise the quality of their products. At the same time, they should promote the development of fruit processing industry.

폴리머 콘크리트 휨부재의 휨 및 전단거동 특성

연규석,김남길,주명기 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

본 연구에서는 압축강도 1,400 kgf/㎠를 갖는 불포화 폴리에스터 폴리머 콘크리트를 이용하여 제작한 C형 시험체에 대한 편심압축 시험을 통하여 폴리머 콘크리트 휨부재의 응력-변형률 관계를 구명하고 등가직사각형 응력블럭의 파라미터 α,β_1, ν를 산출하였다. 아울러, 인장철근비를 0.038, 0.076 및 0.094로 하고 전단스팬비(a/d)를 1.5, 2.5 및 3.5로하는 9종의 철근 보강 폴리머 콘크리트 보를 제작하고 이에 대한 전단거동을 고찰하였다. 실험결과 등가직사각형 응력블럭의 파라미터 α,β_1, ν는 각각 0.61, 0.73, 0.845로 나타났으며, 사인장강도 및 극한전단강도의 예측식인 ACI 규준식 및 Zsutty 제안식을 수정하여 고강도 폴리머 콘크리트의 전단강도예측식을 제안할 수 있었다. 그러나, 보다 정확한 전단설계를 위해서는 스트럿-타이 모델이나 트러스 모델을 적용한 이론 및 실험적인 연구가 더 이루어져야 할 것이다. In this study, C-shaped specimens have been made with the unsaturated polyester resin of which the compressive strengths is 1,400 kgf/㎠. The stress-strain relations of polymer concrete beam member was examined by using the eccentric compressive test and the output stress block parameters α, β_1, γ were obtained by using the equivalent rectangular stress block. Three different tensile reinforced ratios, 0.038, 0.076, 0.094, and shear span ratios (a/d) 1.5, 2.5, 3.5 were used to make nine kinds of reinforced polymer concretes and the shear behaviors were investigated. The experimental results showed that the parameters, α, β_1, γ, of equivalent rectangular stress block were obtained as 0.61, 0.73, 0.84, respectively. The prediction formula of diagonal strength or the limit shear strength shown in the ACI standard and the Zsutty proposal was modified and applied for the proposal shear strength prediction formula of high-reinforced polymer concrete. In order to do the precise shear design, however, theoretical and experimental researches are thought to be continued by applying the strut-tie model or the truss model.

주5일 수업제의 성공적인 도입을 위한 선결과제

최관경,이명우,김지혜 부산교육대학교 초등교육연구소 2004 초등교육연구 Vol.19 No.-

The purpose of this study is to examine the function and problem of five-day school-week system and to build the desirable image of elementary school-teacher in the era of five-day work-week. As is generally known, the issue of the five-day work-week system was first raised in 1998 and banks were the first to implement it in July, 2002. However, the five-day work-week system was officially adapted July, 2004. As of July 2004, companies with more-than 1,000 employees adapted this system. This involves 1.8million workers, although some companies still have issues to work out such as holiday and pay adjustments. Five-day work-week system will be put into force in small and medium-sized businesses with more than 300 employees starting from July, 2005. The new working hours will also be fully introduced to the governmental and public sectors. Civil servants will start working five days a week from second half of 2005, while the remaining work places will only do so in 2011. Breathing in a more leisurely lifestyle, people are expected more and more to seek diverse and new ways to spend their extra time. The phases in which people may adapt to a leisurely lifestyle can be categorized into three types : cocoon, active and practical. The first describes individuals who will pass their time at home enjoying hobbies or watching television. The second refers to those who will take pace in activities outside the home and the third to those who will use the extra time to expand their knowledge and seek ways to increase their income. At the present time when there is serious talk of a five-day work-week, a number of thoughtful people are pointing out that without increased emphasis on education for leisure time, it could be very dangerous to so shorten the time that man must labor. It is no simple matter for man to learn how to utilize his leisure hours in ways that are, at best, socially beneficial and, at least, not injurious to others and to himself. In this context, five-day school-week system will be put into force in all elementary, middle and high schools nationwide once a month starting from March, 2005. Regretfully, we have traditional obsessions that 'working is a virtue' but not 'working is a vice', 'school is the only place of learning' but 'home is the place of playing', and 'the days of going to school are the only days of learning' but 'the day of not going to school is the day of playing to the full. First of all, teachers should become model persons to demolish such as fixed ideas thoroughly and to become habitual learners. As a matter of fact, man is born to live, not to prepare for life. It is urgent for us to have new ways of thinking which every place of staying is the place of learning and every day after day is the day of learning constantly. In addition, the prerequisites of successful operating of five-day school-week system are as follows : 1) the structural improvement of curriculum, 2) the flexible operation of curriculum adjusting to five-day school-week system, 3) new curriculum-development suited to the efficient reduction of curriculum and activities on holidays, 4) the constructing of various educational infrastructure, and 5) the program development for parents of students to participate voluntarily and positively. In conclusion, I suggest that teachers and parent of students make concerted efforts to introduce five-day school-week system successfully in all nation-wide schools.

플라이 애쉬가 콘크리트 구조물의 철근 부식에 미치는 영향

박진택,유지홍,김정구,이재호,이광명 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.4

Addition of fly ash has beneficial effects on some mechanical properties of concrete, as well as the corrosion process induced by the chloride ion. The aim of this study was to investigate the effect of fly ash on the steel corrosion in concrete with various water-to-binder ratios. The corrosion process of steel bars embedded in concrete without fly ash and with 20% fly ash was tested under complete immersion, in 3.5 wt.% NaCl solution. Monitoring of open-circuit potential and linear polarization method and electrochemical impedance spectroscopy(EIS) were used to follow the corrosion process. Also, ASTM C1202 test method was used to estimate the concrete's resistivity of chloride penetration in concrete. The results obtained from electrochemical tests show that the use of fly ash has led to the improvement of corrosion resistance. Partial cement replacement by fly ash caused significant pore refinement, reduced permeability to chloride ions, and increased corrosion resistance.

都市主婦의 結婚 適應度에 關한 硏究

金惠貞,李蓮淑,任春淑,鄭明姬,曺鏞旬,黃智暎 효성여자대학교 가정대학 학도호국단 1984 家政大論集 Vol.3 No.-

We measured general marital adjustment of the housewives who ilve in Daegu. We analysed marital affectional expression, cohesion, consensus and satisfaction and also analysed marital adjustment according to the level of education or length or marriage. The results are as follows; 1. The level of general marital adjustment of the urban housewives was medium. 2. According to factor analysis, the level of marital affectional expression was medium, the level of marital satisfaction and consensus was high, and the level of cohesion was low. 3. The more educated, the higher the degree of marital adjustment in general. 4. The marital adjustment was lowest in housewives whose length of marriage was 9-11 years. The second lowest were 3-5 years and 21-23 years. The highest was 15-17 years.

대구 성서지역 악취 민원발생일의 기상학적 특성

김해동,구현숙,정우식,최성우,안지숙,박명희 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10

We studied the relationship between a civil affair occurrence of bad smell and meteorological conditions around Seongseo district for recent 2 years. The results were as follows; (1) The civil affair occurrence days of bad smell were concentrated from May to August. (2) Daily mean temperatures were mostly 20~28℃ and daily mean relative humidities were 60~80%. (3) Wind speeds were mostly less than 2m/s(75%). and wind directions were southerly winds(50%). It was hardly occurred for relatively well-ventilated conditions in cases of wind speeds 2m/s over. And the Lagrangian particle dispersion model were used to figure out the transport route in a civil affairoccurrence days of bad smell. It was found that the south-western winds transported the bad smelling materials from Jungni-dong(the place of source) to the housing complex located along a piedmont district.

Morphological Variations Between Cultivated Types of Perilla Crop and Their Weedy Types in Korea and Japan

Ji Na Jung,Kweon Heo,Myong Jo Kim,Ju Kyong Lee 한국육종학회 2008 한국육종학회지 Vol.40 No.4

In order to better understand the morphological differentiation of the two cultivated types of Perilla crop and their weedy types in Korea and Japan, we studied the variation of 62 accessions by examining 15 morphological characteristics. By using ANOVA (one-way analysis of variance), we determined that var. frutescens and var. crispa showed significant morphological differences in terms of plant height and seed weight. Furthermore, cultivated var. frutescens and var. crispa could also be clearly discriminated from one another using PCA (principal component analysis). Specifically, quantitative and qualitative characteristics such as plant height, seed weight, degree of pubescence, shape of leaf, color of leaf, fragrance of plant, color of flower, color of stem and seed size greatly contributed to differences seen in the positive and negative direction on the first axis. In our study, most accessions of cultivated var. frutescens and those of its weedy type could be clearly discriminated from one another, however, most accessions of cultivated and weedy types of var. crispa were not clearly discriminated by the ANOVA and PCA analyses. These results indicated that cultivated var. frutescens can be considered to be a domesticated form, while the cultivated var. crispa can not be considered to be a domesticated form in Korea and Japan. It is our belief that our results concerning the morphological variations among cultivated types of Perilla crop and their weedy types in Korea and Japan will help ensure the long-term success of breeding programs and maximize the use of the germplasm resources in Korea.

The Influence of Dental Hygiene Student’s Communication Ability and Conflict Management Types on Adaptation to College Life

( Myong-suk Shin ),( Ji-hyoung Han ),( Ji-min Hwang ) 한국치위생과학회 2021 치위생과학회지 Vol.21 No.1

Background: The purpose of this study was to investigate the effects of dental hygiene students’ communication ability and conflict management types on adaptation to college life improve adaptation to college life and to suggest strategies to play a role as a professional dental hygienist in clinical practice. Methods: The subjects of this study were selected by random sample extraction of dental hygiene students from two colleges in Gyeonggi and one Chungcheong area. The survey was conducted online for dental hygiene students from July 20 to October 31, 2020. In order to comply with research ethics, this study was investigated with the consent of the subjects. The sample was analyzed for the final 351. Results: Dental hygiene students’ communication ability was 3.74 points, conflict management types was 3.01 points, and adaptation to college life was 3.30 points. In the type of conflict management according to the general characteristics, the problem-solving method, the avoidance method, the compromise method, and the concession method showed statistically significant differences in major satisfaction. Among the types of conflict management, the highest positive correlation (r=0.613) was shown in the relationship between the problem-solving method and the compromise method. Factors influencing the adaptation to college life were concentration, forced method, self-disclosure, conversational coherence, and social relaxation. Conclusion: This study is significant in that it derives sub-areas of communication ability and conflict management types that influence adaptation to college life. In the future, there is a need to improve the quality of dental hygienists by continuously conducting research on the types of conflict management targeting dental hygienists, and responding more proactively and actively to conflict situations in the clinical field.

Soil conditions during cultivation affect the total phenolic and flavonoid content of rosemary

Seo Ji Won,Kim Soo Kyung,Yoo Ji Hye,Kim Myong Jo,Seong Eun Soo 한국응용생명화학회 2022 Journal of Applied Biological Chemistry (J. Appl. Vol.65 No.2

In this study, the effects of soil conditions on antioxidant activities of the aerial and underground parts of rosemary were assessed to determine the most effective soil conditions for cultivation. The antioxidant activity was the highest (51.58±2.93 μg/mL) when cultivated in the mixture of gardening soil and vermiculite using DPPH assay. The antioxidant activity of underground parts the highest (127.48±12.38 μg/mL) when cultivated in the mixture of soil, vermiculite, and perlite. ABTS assay showed that the antioxidant activity of aerial parts was 230.34±57.93 μg·mL−1 when cultivated in the mixture of gardening soil and vermiculite and that of underground parts was 320.98±16.04 μg·mL−1 when cultivated in the mixture of gardening soil, vermiculite, and perlite. The total phenolic content of aerial parts was the highest (155.25±2.96 mg GAE/g) when cultivated in the mixture of gardening soil. The total flavonoid content of aerial parts was the highest (67.32±5.27 mg QE/g) when cultivated in the mixture of gardening soil. Therefore, the mixture of gardening soil, vermiculite, and perlite is superior to gardening soil alone for cultivation of rosemary to increase its antioxidant activity as well as total phenolic and flavonoid content.

보안 요구 수준에 근거한 효율적인 패킷 암호화 기법

노지명(Ji-Myong Nho),양정민(Jung-Min Yang) 한국정보보호학회 2004 정보보호학회논문지 Vol.14 No.5

온라인 게임과 같이 대규모로 데이터를 주고받는 클라이언트-서버 구조의 서비스에서 정보 보호를 위해 패킷을 암호화하면 암호화로 인해 서버에 과도한 부하가 유발되고 서비스에 심각한 문제가 생길 수 있다. 따라서 데이터의 보안 요구에 맞게 보다 효율적인 암호화 기법을 사용하여 암호화 부하를 되도록이면 줄이는 것이 필요하다. 본 논문에서는 암호화로 인한 부하를 줄이는 방법으로 복수의 암호 알고리즘을 이용하여 데이터의 보안 요구에 따라 암호화체계를 달리하는 패킷 암호화 기법을 제안한다. 이러한 기법은 중요도가 서로 다른 다양한 종류의 데이터들이 끊임없이 전송되는 클라이언트-서버 구조의 인터넷 서비스에서 잘 적용될 수 있다. 실험을 통하여 본 논문에서 제안한 방법의 효율성을 정량적으로 검증한다. Under a large-scale client-server service environment, e.g., online games, encrypting data for acquiring information security often causes overload to the server and hence degradation of the service itself. Therefore, for reducing encryption payload, it is necessary to use adequately an efficient encryption scheme with respect to the security requirements of transmission data. In this paper, we propose a packet encryption scheme using multiple cryptosystems to realize such capability, which assigns a different cryptosystem according to the security requirements level. The proposed encryption scheme is applicable to internet services with heavy traffic ratios in which different kinds of data packets are incessantly transmitted between clients and servers. To show its effectiveness and superiority, the performance of the proposed encryption scheme is verified by experiments.