• 한국환경과학회:학술대회논문집
• /
• 한국환경과학회 2005년도 추계 학술발표회 발표논문집
• /
• pp.189-191
• /
• 2005

전국매립지 중 수도권, 울산, 대구 세 매립지의 침출수를 채수하여 Photobacterium을 이용한 독성 test와 Yeast Two-hybride Based Assay을 이용하여 에스트로겐성을 측정하였다. 독성도 값은 대구에서 145로 가장 높은 값을 나타냈다. 에스트로겐성은 울산이 hER 3.2ppt, mER 210ppt로 가장 높게 나타났으며, 채수지점 모두 industrial hormones에 반응성이 좋은 mER 값이 높게 나타났다. 특히 대구지점은 독성도 값은 높으나 에스트로겐성은 낮은 값을 나타내는 것으로 보아 호르몬 영향을 억제하는 antangonist chemicaldml 존재 가능성이 시사된다.

• KSTLE International Journal
• /
• 제7권1호
• /
• pp.1-4
• /
• 2006

The electro rheological behavior of the hollow polyaniline pimelate suspension in silicone oil was investigated. Hollow polyaniline pimelate suspension showed a typical ER response (Bingham flow behavior) upon application of an electric field. The shear stress for the suspension exhibited the dependence with a factor equals to 0.84 power on the electric field. The experimental results for the hollow polyaniline pimelate suspension correlated with the conduction models of Tang et al., and this suspension behaved as an ER fluid.

• KSTLE International Journal
• /
• 제7권1호
• /
• pp.18-21
• /
• 2006

The electrorheology of hollow PANI derivative suspensions in silicone oil was investigated by varying the electric fields and shear rates, respectively. The hollow PANI derivative susepnsions showed a typical electrorheological (ER) response caused by the polarizability of an amide polar group and shear yield stress due to the formation of chains upon application of an electric field. The shear stress for the hollow PANI succinate suspension exhibited an electric field power of 0.67. On the basis of the experimental results, the newly synthesized hollow PANI derivative suspensions were found to be an anhydrous ER fluid.

• Tribology and Lubricants
• /
• 제17권2호
• /
• pp.124-129
• /
• 2001

The electrical and rheological behaviors of the cellulose phosphate ester suspension in the silicone oil were investigated. Cellulose phosphate ester suspension showed a typical ER response (Bingham flow behavior) upon application of an electric field. The shear stress for the cellulose phosphate ester suspension exhibited a linear dependence on the volume fraction of particles and a square power of the electric field. On the basis of the experimental results, cellulose phosphate ester suspension correlated with the conduction model of Tang et al, and found to be an ER fluid.

• KSTLE International Journal
• /
• 제9권1_2호
• /
• pp.36-38
• /
• 2008

The electrical and rheological behavior of the hollow polyaniline glutarate suspension in silicone oil was investigated. Hollow polyaniline glutarate suspension showed a typical ER response (Bingham flow behavior) under a DC electric field. The shear stress for the suspension exhibited the dependence with a factor equals to 0.95 power on the electric field. The experimental results for the hollow polyaniline glutarate suspension behaved as an ER fluid.

• KSTLE International Journal
• /
• 제4권1호
• /
• pp.14-17
• /
• 2003

The electrical and rheological properties of a chitosan malonate suspension in silicone oil was investigated by varying the electric fields, volume fractions of particles, and shear rates, respectively, The chitosan malonate susepnsion showed a typical electrorheological (ER) response caused by the polarizability of an amide polar group and shear yield stress due to the formation of multiple chains upon application of an electric field. The shear stress fur the suspension exhibited a linear dependence on the volume fraction and an electric field power of 1.88. On the basis of the experimental results, the newly synthesized chitosan malonate suspension was found to be an anhydrous ER fluid.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2006년도 하계종합학술대회
• /
• pp.355-356
• /
• 2006

MPEG-4 ER-BSAC decoder employes a full search method for maximum significance search and arithmetic decoding position search in spectral data decoding procedure. Then the search procedure have the most complexity. This paper proposes the new search method, the maximum significance tree structure, for the optimized implementation of BSAC decoder.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2007년도 춘계학술대회B
• /
• pp.2879-2884
• /
• 2007

Dynamic responses of electrorheological (ER) fluids in steady pressure flow to stepwise electric field excitations are investigated experimentally. The transient periods under various applied electric fields and flow velocities were determined from the pressure behavior of the ER fluid in the flow channel with two parallel-plate electrodes. The pressure response times were exponentially decreased with the increase of the flow velocity, but increased with the increase of the applied electric field strength. In order to investigate the cluster structure formation of the ER particles, it was verified using the flow visualization technique that the transient response of ER fluids in the flow mode is assigned to the densification process in the competition of the electric field-induced particle attractive interaction forces and the hydrodynamic forces, unlike that in the shear mode determined by the aggregation process.

• 한국윤활학회:학술대회논문집
• /
• 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
• /
• pp.345-346
• /
• 2002

The electrical and rheological properties of a chitosan malonate suspension in silicone oil was investigated by varying the electric fields, volume fractions of particles, and shear rates, respectively. The chitosan malonate susepnsion showed a typical electrorheological (ER) response caused by the polarizability of an amide polar group and shear yield stress due to the formation of multiple chains upon application of an electric field. The shear stress for the suspension exhibited a linear dependence on the volume fraction and an electric field power of 1.88. On the basis of the results, the newly synthesized chitosan malonate suspension was found to be an anhydrous ER fluid.

• 영어어문교육
• /
• 제18권1호
• /
• pp.69-89
• /
• 2012

This paper explored the effects of extensive reading (ER) on Korean university students' L2 reading proficiency and reading rates. This study also illustrated how ER can be integrated into a university English reading class. Seventeen students who took a summer reading course participated in this study. Data were gathered through pre- and post- tests in terms of participants' reading comprehension proficiency and reading rates and post- questionnaire with regard to their attitudes toward L2 storybook reading after they have experienced it. The analysis was carried out using the Paired Samples t-test. It was revealed that ER has a positive effect on the enhancement of the participants' reading comprehension and reading rates. The participants showed their continued intention to read in English and a strong belief that persistent reading in English in the long run will help improve their English. The results of this study confirm the educational values of incorporating ER into university English reading classes. The pedagogical implications for EFL instructors are described.