The study of grinding behavior characteristics on the metal powders has recently gained scientific interest due to their useful applications to enhance advanced nano materials and components. This could significantly improve the property of new mechatronics integrated materials and components. So, a new evaluation method for standardizing grinding equipment and a comparative study for the grinding experiment during the grinding process with various grinding mills were investigated. The series of grinding experiments were carried out by a traditional ball mill, stirred ball mill, and planetary ball mill with various experimental conditions. The relationship between the standardization of equipment and experimental results showed very significant conclusions. Furthermore, the comparative study on the grinding experiment, which investigated changes in particle size, particle morphology, and crystal structure of materials with changes in experimental conditions for grinding equipment, found that the value of particle size distribution is related to the various experimental conditions as a revolution speed of grinding mill and media size.

산소 분리를 위한 세라믹 중공사막을 상전이 방적기술을 통해 제조하였다. Ba0.5Sr0.5Co0.8Fe0.2O3-δ 선구 물질을 고분자 용액에 분산시킨 후 이중관형 노즐을 통해 사출한 후 상전이, 건조한 후 분리막의 한쪽 끝을 밀봉하였다. La0.6Sr0.4Ti0.3Fe0.7O3-δ 코팅 층은 dip coating 방법으로 제조되었으며 최종적으로 고온에서 소결하여 La0.6Sr0.4Ti0.3Fe0.7O3-δ로 코팅된 one end-closed type Ba0.5Sr0.5Co0.8Fe0.2O3-δ 중공사막을 제조하였다. 산소투과실험은 대기 중 공기를 사용하였으며 진공펌프를 연결하여 투과된 산소 유량 및 순도를 측정하였다.

Excess phosphorus in water has become a crucial aspect concerning the eutrophication. Experiments were carried out to fabricate particles of iron oxide to polymer and the beads were then calcinated. It was found that adsorption process most satisfactory fitted to Langmuir equation (R2>0.92) with maximum adsorption capacity 2.663 mg P/g adsorbent. Equilibrium of adsorption was reached after 3 h, while the initial adsorption rate increased from 0.46 mg/g-h to 3.83 mg/g-h when the bead iron content increased from 40.4 mg Fe/g to 160 mg Fe/g. This research was supported by a project (No. 2013001390002) from the Korea Environmental Industry & Technology Institute funded by the Ministry of Environment and the Brain Korea 21 Plus program of the Korean government.

습식흡수제를 이용한 이산화탄소 포집 공정은 재생 시 많은 에너지가 필요한 단점이 있어 에너지를 낮추기 위한 다양한 대체 기술이 개발되고 있다. 이런 연구의 일환으로 최근에 분리막과 흡수제를 혼합하는 접촉막 기술이 개발되고 있으며, 흡수제의 단점을 극복하는 연구가 진행되고 있다. 본 연구에서는 세라믹소재를 이용하여 중공사막을 제조하였고 젖음성을 제어하기 위해 소수성 코팅을 한 중공사막을 개발하였다. 중공사막의 XRD, SEM, FT-IR 및 Porosimeter를 이용하여 분석하였고, 기공에 따른 CO2 분리 특성을 규명하였다.

The purpose of this study is to examine the negative effects of silence climate on the innovation behavior and LMX (Leader-Member Exchange). In order to test our model, we conducted a survey based on the questionnaire. Results showed that silence climate had a negative effect on the innovation behavior and LMX. Secondly, The LMX had a positive effect on innovation behavior. Moreover, the LMX partially mediated silence climate and the innovation behavior. Finally, we drew a conclusion by discussing limitations and implications of the research, and suggested directions for further researches.

PURPOSES : The objective of this study is to analyze the performance of anti-stripping agent depending on its type and content to reduce pothole, an increasing pavement distress due to abnormal climate intensity. METHODS : In the past years, U.S and many countries in Europe use hydrated lime and liquid anti-stripping agent in asphalt mixtures. Hydrated lime or liquid anti-stripping agent is substituted for filler and binder, respectively, to improve the anti-stripping property of asphalt mixtures. To investigate this, indirect tensile strength test was performed and TSR values were compared for different content of hydrated lime and types of liquid anti-stripping agent in asphalt mixture. RESULTS : Test results indicate that hydrated lime remarkably increased the asphalt mixture performance on anti-stripping denoted by the increased in TSR values from 55% to 100%. Liquid anti-stripping agent also increased the value of TSR but not significant. In addition, depending on the types of aggregate, TSR values and effect of liquid anti-stripping were different. CONCLUSIONS : Using anti-stripping agents improve the anti-stripping property of asphalt mixture especially hydrated lime; however, more experiments should be conducted to improve the reliability about the effect of liquid anti-stripping agent.

Antibodies are used for preventing several infectious diseases in food animals. Though, antibiotics can deal with infection however, their widespread usage may cause developments of resistance and can also get transferred to humans through animal products. Therefore, production of antibodies against infectious agents in the egg yolk could be an interesting alternative. The present study was conducted with a focus on producing the antibody against Escherichia coli E68 and H28 in egg yolk of laying hens, which are believed to be a cause for diarrhea and beriberi in piglets. The result received from the experiment were promising and have shown efficiency of antibody production in the range of 2-7.3% in the groups which are infected with E68 only and the one which was infected with both strains. The outcome of present research has revealed the potentiality of egg yolk in production of antibody for laying hens, could open a new approach for production of antibodies to manage diarrhea and beriberi

캄보디아는 동양구에 위치한 국가로 북동쪽으로 라오스, 동쪽과 남동쪽으로 베트남, 북쪽과 서쪽으로 태국과 접하고 있다. Samkos지역은 캄보디아 서쪽에 위치한 산림지역으로 1997년 유네스코 생물권 보호구역으로 지정된 바 있다. Samkos산은 1750m 높이로, 산림이 우거지며 야생동물이 다양하게 서식하는 지역이다. 현재 Samkos지역은 화전에 의한 화재와 개발로 인해 산림이 심각하게 훼손되고 있으며, 그에 따라 생물다양성 감소에도 큰 영향을 미칠 것으로 예상되는 지역이다. 본 연구는 2012년 7월 12일 ~ 7월 23일, 2013년 2월 13일 ~ 2월 18일까지 캄보디아 서부지역에 위치한 Samkos산에서 실시하였다. 연구방법은 Sweeping, Light trap, Bucket trap 등 다양한 방법을 이용하여 곤충상을 조사한 결과, 나비목은 총 7과 81속 98종이 채집되었다.

PURPOSES : The objective of this study is to evaluate the mechanical characteristics of castor oil based bio-polymer concrete for use of ultra thin overlays. METHODS : To evaluate the mechanical properties of bio-polymer concrete, the various laboratory tests including compressive, tensile, and flexural strength, and elongation tests were conducted on bio-polymer concrete specimens in this study. The mechanical characteristics of bio-polymer concretes were examined by changing the content of hardener and polymer binder to determine the optimum content for ultra-thin overlays. The bio-polymer concrete developed in this study was used for field trial test of the ultra-thin bridge deck pavement for verifying the workability and monitoring the long-term performance of materials. RESULTS : Test results showed that tensile and the flexural strength of bio-polymer concretes increase and the elongation of bio-polymer concrete decreases with increase of binder content. A field adhesive strength tests conducted on bridge deck pavement indicates the bio-polymer concrete has more than 2MPa of adhesive strength satisfy with the design criteria. CONCLUSIONS : The bio-polymer concrete with more than 20% content of castor oil was developed for ultra-thin overlays in this study. It is found from this study that the 35% of hardener content is most appropriate for maintaining the strength characteristics and flexibility.

본 연구는 다양한 기상변화에 따른 안전을 확보하기 위한 해상에서의 플로팅 플랫폼의 연결에 대하여 연구하였다. 본 연구의 목적은 다양한 해상변화가 일어나는 연안역에 설치되는 플로팅 구조물에 관한 문헌 조사를 실시한 후, 콘크리트 구조물 연결하는 모델을 제시하는 것이다. 본 연구에서는 플로팅 구조의 개념, 기존의 모델, 설계적 평가를 포함한 콘크리트 구조물 기반 플로팅 플랫폼을 기술하였고, Rigid Pontoon Connector를 국내 연안역에 적합한 모델로 제안하였다. 연구의 결과로서, 리기드 폰툰 커넥터 디자인은 (Rigid Pontoon Connector) 안정적으로 플로팅 플랫폼의 연결을 구축할 수 있는 매우 효율적이고 실용적인 솔루션으로 분석되었다.

공급 체인 관리 및 물류 개발에 RFID 기술에 대한 국제적 적용에 대한 분석과 향후 활성화 방안에 대하여 연구를 수행하였다. 국제 물류의 RFID의 최근 응용 프로그램을 연구 분석하고 제조업체, 보관업체, 물류업체, 운송업체, 항만 및 유통업체간의 RFID 채택 및 사용의 핵심 요소를 범국가적, 국제적 물류체인과 연계하여 필요한 내용을 분석하고 국내에 필요한 요소 및 방안에 대하여 연구 기술하였다.

This study was conducted to assess the levels of microbiological hazards of preprocessed Namuls, which were served at the school foodservice. 19 preprocessed ground or root vegetables were collected from 21 schools in May to June of 2011. Heavy contamination of aerobic plate counts (from 3.39 to 8.42 logCFU/g) and total coliform groups (from 3.16 to 7.84 logCFU/g), enterobacteriaceaes (from 2.53 to 7.55 logCFU/g) were detected in preprocessed Namuls. In addition, the detection rates of Escherichia coli, Staphylococcus aureus and Bacillus cereus (emetic form) were 4.3%, 11.7% and 2.1%, respectively. In addition, sanitary indicative bacterium at preprocessing steps of root vegetables (lotus root, burdock root, bellflower root) and blanched Namuls (bracken, sweet potato vine, chinamul) were analyzed. Aerobic plate counts, coliform groups, and enterobacteriaceaes were not effectively removed during preprocessing including washing and soaking steps. In the case of blanched Namuls (bracken, sweet potato vine, chinamul), contamination levels increased more after drying process and no significant reduction effect on the levels of microbial contamination was observed during preprocessing steps. Thus, effect of preprocessing steps on the microbiological hazards in Namuls must be reevaluated to improve the microbiological quality of preprocessed Namuls at the school foodservice and retail markets.

고등식물은 고정된 장소에 서식하기 때문에 주변 환경의 오염에 따른 부정적 영향을 회피할 수 없다. 대기 오염 지역과 청정지역에 서식하는 가로수의 이온화 방사선에 대한 효소활성 변화를 이용하여 대기오염 정도를 진단하는 방법을 개발하고자 본 연구를 수행하였다. 오염된 대기 속에 서식하며 대기에 포함된 오염물질로부터 지속적으로 산화스트레스를 받아온 식물체의 경우 이를 극복하기 위한 수단으로 생화학적 저항성을 발달시키게 된다. 항산화 효소와 자유라디칼 제거능,