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Consumerism and Sustainable Development:An Austrailian-South Korean Comparative Study
Patrick Mullins,정대연,John S. Western,Ian Lowe,Rod Simpson 한국사회과학협의회 2004 Korean Social Science Journal Vol.31 No.1
This paper addresses a socio-cultural contradiction, one that is of monumental proportion, being global in scale and allegedly threatening the survival of the natural and social worlds. It emanates from two cultural imperatives - consumerism and environmentalism - and their consequent behaviours - consumption and environmental behaviour. Consumerism is a cultural imperative that demands we appropriate as many goods and services as possible and that we should do this essentially for fun and enjoyment. In contradistinction, environmentalism is the cultural imperative that demands we act in an environmentally sustainable way and, most particularly, do this by cutting back on consumption and against a backdrop of a impending
뇨중 Urinary Dipeptidase 의 근원에 대한 고찰
박행순,김도하,박성광,강성귀,Marlyn Burks,James M . Mullins,Benedict J . Campbell ( Haeng Soon Park,Doh Ha Kim,Sung Kwang Park,Sung Kyew Kang,Marlyn Burks,James M . Mullins,Benedict J . Campbell ) 생화학분자생물학회 1992 BMB Reports Vol.25 No.4
Urinary dipeptidase, an enzyme with β-lactamase activity, was purified from the urine of healthy individuals. The purified enzyme was monophoretic when examined in polyacrylamide gel electrophoresis at pH 8.3, and its molecular mass estimated by HPLC was 227,000 daltons. It catalyzed the hydrolysis of the β-lactam antibiotic, N-formimidoyl-thienamycin (imipenem) with K_m=15.8 mM and V_(max)= 55 μ㏖/min/㎎. Lineweaver-Burk analysis of urinary dipeptidase-catalyzed hydrclysis of imipenem in the presence of cilastatin (Z-S-[6-carboxy-6-{ [2,2-dimethyl-(S)-cyclopropyl carboxy]-amino}-5-hexenyl]-L-cysteine) demonstrated reversible, competitive inhibition. The K_i for the competitive inhibitor, cilastatin, was 6 M. Renal dipeptidase was solubilized with n-butanol from membranes prepared from the kidneys of renal stone patients and purified. The two enzymes showed many properties in common including molecular mass, substrate specificity, kinetic parameters, inhibition by cilastatin, pH optima, electrophoretic mobility, and immunological cross-reactivity. Disintegration of kidney tubules and release of peptidase activity into the urine of rabbits treated with sublethal levels of the nephrotoxic agent, cephaloridine, suggest that the urinary dipeptidase originates from the proximal tubules of mammalian kidneys.
Dynamic characterization of satellite assembly for responsive space applications
Mascarenas, David,Macknelly, David,Mullins, Josh,Wiest, Heather,Park, Gyuhae IOP Pub 2013 Measurement Science and Technology Vol.24 No.7
<P>The rapid deployment of satellites for responsive space surveillance applications is hindered by the need to flight-qualify their components and the resulting mechanical assembly. Conventional methods for qualification testing of satellite components are costly and time consuming. Furthermore, full-scale vehicles must be subjected to simulated launch loads during testing, and this harsh testing environment increases the risk of damage to satellite components during qualification. This work focuses on replacing this potentially destructive testing procedure with a non-destructive structural health monitoring (SHM)-based technique while maintaining the same level of confidence in the testing procedure's ability to qualify the satellite for flight. We focus on assessing the performance of SHM techniques to replace the high-cost qualification procedure and to localize faults introduced by improper assembly. The goal of this work is to create a dual-use system that can both assist in the process of qualifying the satellite for launch, as well as provide continuous structural integrity monitoring during manufacture, transport, launch and deployment. SHM techniques were applied on a small-scale structure representative of a responsive satellite. The test structure consisted of an extruded aluminum space-frame covered with aluminum shear plates assembled using bolted joints. Multiple piezoelectric transducers were bonded to the test structure and acted as combined actuators and sensors. Piezoelectric active-sensing based techniques, including measurements of low-frequency global frequency response functions and high-frequency wave propagation techniques, were employed. Using these methods in conjunction with finite element modeling, the dynamic properties of the test structure were established and areas of potential damage could be identified and localized. A procedure for guiding the effective placement of the sensors and actuators is also outlined.</P>