• Journal of Microbiology and Biotechnology
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• 제20권4호
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• pp.749-756
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• 2010

In many conditions, bacterial surface properties are changed as a result of variation in the growth medium and conditions. This study examined the influence of bile salt concentrations (0-0.1%) on colony morphotype, hydrophobicity, $H_2O_2$ concentration, S-layer protein production, and slpA gene expression in Lactobacillus acidophilus ATCC 4356. It was observed that two types of colonies (R and S) were in the control group and the stress condition. When the bile level increased in the medium, the amount of S type was more than the R type. A stepwise increment in the bile concentration resulted in a stepwise decline in the maximum growth rate. The results showed that hydrophobicity was increased in 0.01%-0.02% bile, but it was decreased in 0.1% bile. Treatment by bile (0.01%-0.1%) profoundly decreased $H_2O_2$ formation. S-Layer protein and slpA gene expression were also altered by the stress condition. S-Protein expression was increased in the stress condition. The slpA gene expression increased in 0.01%-0.05% bile and it decreased in 0.1% bile. However, we found that different bile salt concentrations influenced the morphology and some surface properties of L. acidophilus ATCC 4356. These changes were very different in the 0.1% bile. It appears that the bacteria respond abruptly to 0.1% bile.

• 한국환경복원기술학회지
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• 제20권6호
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• pp.51-66
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• 2017

This study was conducted to develop detailed evaluation indicator as a way for evaluating sustainable urban ecosystem health focused on ecological urban elements from an eco-cultural point of view after the appearance of Eco-cultural City to meet various needs. And this study was also conducted to search for ways to utilize the detailed evaluation indicator like institutionalization. Eco-cultural City was defined as a city where ecological environment and cultural environment coexist and was aimed to derive applicable planning indicators in Korea. For this, FGI was executed, planning indicators were derived, and suitability was examined. The weights were calculated based on the selected indicators through AHP expert survey. After getting the result of FGI, experts reviewed the adequacy of definition from Eco-cultural City and its necessity, and the applicability of planning indicators was examined with evaluation of suitability. As a result of evaluating suitability, it was judged that 41 indicators based on an overall average of 4 areas were relatively high on suitability and also important among sectors. As for the analysis result, the priority order in multistage classification was as followed : harmony between human and environment(B) 0.349, environmental resources(A) 0.266, city environment and quality of culture(C) 0.208, and role division and citizen participation(D) 0.177. In the second level of relative importance, environment protection and infra in the role and citizen participation section was the highest, 0.449, harmonization policy and system in calculating weights was the highest.

• 생태와환경
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• 제45권1호
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• pp.34-41
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• 2012

The variation of dissolved oxygen (DO) was monitored with high frequency by an automatic data-logging sensor in a eutrophic urban stream (the Anyang Stream) located in a metropolitan area of Seoul, South Korea. In general, DO showed the diel variation of increase in daytime and decrease at night, implying that primary production is a major mechanism of oxygen supply in this ecosystem. The fluctuation of oxygen was determined by rainfall. DO depletion was most obvious after a rainfall resulting in an anoxic condition for a day, which is thought to be caused by scouring of periphyton and organic ooze at the stream bottom. Seasonally DO was higher in winter and frequently depleted in warm seasons. DO depletion was often at a dangerous level for fish survival. Fish survey showed that little fish was living at the study site and oxygen depletion may be the major stress factor for aquatic animals. From the results it can be suggested that a high frequency monitoring of oxygen should be established for the proper assessment of aquatic habitats and better management strategy.

• 한국환경복원기술학회지
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• 제18권1호
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• pp.127-133
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• 2015

Interests in ecosystem services have increased and a number of attempts to perform a quantitative valuation on them have been undertaken. To classify the ecosystem types landcover classification maps are generally used. However, some forest types on landcover classification maps have a number of errors. The purpose of this study is to verify the forest types on the landcover map by using a variety of field survey data and to suggest an improved method for forest type classifications. Forest types are compared by overlaying the landcover classification map with the 4th forest type map, and then they are verified by using National Forest Inventory, 3rd National Ecosystem Survey and field survey data. Misclassifications of forest types are found on the forest on the forest type map and farm and other grassland on the landcover map. Some errors of forest types occur at Daegu, Busan and Ulsan metropolitan cities and Gangwon province. The results of accuracy in comprehensive classification show that deciduous forest is 76.1%; coniferous forest is 54.0%; and mixed forest is 22.2%. In order to increase the classification accuracy of forest types a number of remote sensing images during various time periods should be used and the survey period of NFI and the National Forest Inventory and National Ecosystem Survey should be consistent. Also, examining areas with wide forest patch should be prioritized during the field survey in order to decrease any errors.

• 기술경영경제학회:학술대회논문집
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• 기술경영경제학회 1999년도 제16회 동계학술발표회 논문집
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• pp.216-239
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• 1999

Korean government has planned a large scale multidepartment-participated national R&D program to advance and improve her science and technology and the quality of life In the level of advanced(especially G-7) countries in the forthcoming 21st century. It is called as "Highly Advanced National projects" or "G7 projects", which was initiated in 1991 with 18 sub-programs to date. It has planned to be continued until 2001 with its total fund of 4, 591 billion Won, comprised of 2, 033 billion Won from the public sector and 2, 558 billion Won from the private sector. Evaluation activities, the country has carried out to date, for national R&D programs including HAN projects are focused mainly on the assessment of scientific and technological results to decide that a specific program should be continued, terminated, or modified. Thus, it is necessary for national R&D programs to be evaluated socioeconomically for the purpose of assessing the nationwide economic and social impact from the program. Socioeconomic evaluation would be told how and where the program contributed to the society, and what the socioeconomic impacts are resulted from the program. It would be useful for the means of (ⅰ) fulfillment of public accountability to legitimate the program and to reveal the expenditure of pubic fund, and (ⅱ) managemental and strategical learning to give information necessary to improve the making. program and policy decision making, The objectives of the study are to develop the methodology of modeling the socioeconomic evaluation, and build up the practical socioeconomic evaluation model of the HAN projects including scientific and technological effects. Since the HAN projects consists of 18 subprograms, it is difficult In evaluate all the subprograms simultaneously. Despite, each program is being performed under the category of HAN projects, so the common socioeconomic issues are existing, The followings are main results of the study. First, the hierarchical structure of the socioeconomic evaluation are constructed; Evaluation Perspective, Evaluation Bounds, and Evaluation Aspect. Second, based on the goals of the HAN projects, the evaluation perspectives are established as (ⅰ) the strengthening of industrial competitiveness, (ⅱ) the enhancement of national scientific and technological capability, (ⅲ) the improvement of quality of life. Third, the evaluation bounds for each evaluation objective are defined to specify the affected area. Finally, the evaluation aspects for each evaluation bounds are formulated containing essential elements describing the evaluation bounds.

• 한국산학기술학회논문지
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• 제16권10호
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• pp.6551-6557
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• 2015

철근부식에 의해 발생된 녹은 철근 주변의 콘크리트에 팽창 압력을 유발하여 콘크리트의 균열, 피복콘크리트의 박리나 탈락, 철근의 단면적 감소 등 구조물의 내구성에 부정적인 영향을 끼친다. 본 논문에서는 코일철근을 대상으로 3차원 스캐너를 이용하여 철근이 부식됨에 따른 표면적을 측정하여 철근의 부식률과 표면 거칠기와의 관계를 프랙탈 이론을 이용하여 규명하였다. 코일 철근은 현장 적재일이 길수록 부식률이 증가하였으며, 부식률이 증가할수록 표면 거칠기는 거칠게 평가되었다. 프랙탈 차원의 증가량은 적재일 3일, 7일, 14일, 21일 경우 각각 0.0235, 0.0280, 0.0319, 그리고 0.0455로 나타났다. 이때의 부식률은 각각 0.3367%, 0.6127%, 0.7898%, 그리고 1.1965%로 나타나 프랙탈 차원을 이용한 부식된 코일철근의 표면 물리량 평가는 실제 부식률과 유사한 결과를 나타냈다.

• 정보관리학회지
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• 제34권2호
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• pp.47-80
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• 2017

본 연구의 목적은 과학분야 연구자를 대상으로 기관리포지터리 수용에 영향을 미치는 요인들을 도출하고 이들 요인들간의 관계를 규명함으로써 기관리포지터리 수용모형을 개발하는 것이다. 270명의 물리수학분야와 생명과학분야 연구자들이 응답한 설문조사와 12명의 심층면담 내용 분석 결과, 개인의 심리적 특성이 기관리포지터리 수용의도에 가장 높은 영향을 미치는 것으로 나타났다. 그 다음은 성과기대, 사회조직적 영향 순으로 확인되었으나, 인지된 위험은 유의한 영향을 주지 못하는 것으로 검증되었다. 기관리포지터리 수용의도 향상을 위한 전략으로 국가주도적 제도 개선 방안과 운영 기관의 역할강화 및 홍보 방안, 그리고 연구자의 참여유도형 서비스방안을 제언하였다.

• 방사성폐기물학회지
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• 제7권3호
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• pp.167-174
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• 2009

EBR-II사용후핵연료의 파이로건식처리공정에 의해 발생된 우라늄의 순도에 대한 포괄적인 분석을 수행하였다. 분석 결과를 미국 아이다호 국립연구소 및 한국원자력 연구원의 협력과제 하에서 한국과 미국의 저준위 폐기물 기준으로 비교하였다. 미국의 저준위 폐기물 기준은 우라늄 등위원소를 포함하지 않으나, 한국의 경우는 포함하는 것으로 조사되었다. 분석 결과 EBR-II 우라늄 생성물 내에서 저준위 기준을 초과하는 유일한 알파 핵종은 우라늄 동위원소가 아니라 Pu-239였다. 생성물 내의 Pu 오염은 개량된 염증류공정을 통한 예비실험 결과 획기적으로 줄일 수 있음을 알 수 있었으며, 보다 공정을 개선시킨다면 제안된 기술을 이용하여 미국의 저준위 기준을 만족시킬 수 있을 것으로 판단된다.

• 한국식생활문화학회지
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• 제27권5호
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• pp.415-421
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• 2012

This study summarized findings from an investigation into the awareness and evaluation of traditional foods among 197 male and female university students in the Chungnam area. The results were as follows. Regarding awareness of cooktable setting of traditional foods, 44.67% (88 students) of subjects answered that they had little knowledge. Female students showed a significantly high level of awareness of cooktable setting (p<0.05). Regarding the taste of traditional foods, 64.97% (128 students) of subjects responded appropriately. Regarding the necessity for partial development of traditional foods into a modern style, 61.90% (52 students) of male subjects and 84.96% (96 students) of female subjects were in agreement (p<0.01). Regarding the necessity for traditional food education, 77.16% (152 students) were in agreement, especially female students (86.73%, 98 students) showed considerably higher consent (p<0.05). For the assessment of traditional foods, nutrition (4.57 scores), taste (4.31 scores), and appearance (4.26 scores) were very highly assessed, whereas cookery (3.30 scores) and economic aspects (3.04 scores) scored relatively lower. Traditional desserts were recognized as routine and modern by male students. On the other hand, girls recognized desserts as traditional (p<0.05). Accordingly, we must preserve and pass down Korean traditional foods by increasing awareness through education or experience as well as through planning better cookery and economical aspects by applying certain standards for traditional foods.

• 수산해양기술연구
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• 제46권4호
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• pp.392-405
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• 2010

The population of small yellow croaker, Larimichthys polyactis, in the Yellow and East China Seas has decreased significantly since the mid 1970s. Several management measures have been introduced to conserve it, but population size remains low. To rebuild this population, it is now necessary to consider more effective management methods based on the stock assessment. To determine long-term population changes, fishery and biological data collected over 34 years (1969-2002) were analysed. Yearly fish length compositions were analysed for the time periods 1968 through 1970, 1978 through 1982, and 1993 through 2002; and catch data was available from 1969 to 2002. Annual population sizes were calculated based on length composition, the relationship between total length and body weight, and total landings. Analyses showed that since the 1970s, average size of harvested fish decreased; the proportion of less mature fish (smaller than the 50% maturity length, 19cm) in catches has increased and the estimated biomass has decreased significantly. Consequently, the main management recommendation is that juvenile fish need to be better protected to allow the rebuilding of resources to a more sustainable population level. This will require fish size limit, permissible mesh size, and closed area and season regulations.