• Journal of architectural history
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• v.25 no.2
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• pp.21-30
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• 2016

Autonomia movement that emerged in Italy in the 1960s from workerist (operaismo) communism gives historical and discursive context to Manfredo Tafuri's famous criticism of ideology. His thesis on the death of architecture was a radical criticism of Keynesian intervention which was a strategy to cope with the Great Depression. For him, this capitalist development had taken away ideological prefiguration from architecture. At least Tafuri's this early intellectual phase was formed in the wake of magazine Contrapiano and Antonio Negri's influence. Tafuri almost entirely adapted Negri's thought on the importance of capitalist innovation that was uncovered by Keynes, Schumpeter, and Manheim and the periodization in modern history. When we read Tafuri's text with this concrete context, we can avoid being plunged into his abstruseness. On the other hand, 1980's Korea cannot understand Tafuri comprehensibly. 1980's situation to struggle to acquire democracy prescribed only one mode of reception of Tafuri's historiography in Korea. Tafuri's so-called pessimist view point could not satisfy student activists. They want to take intellectual means to sustain student movement and to secure political dynamics of protest. But at the same time they have anxiety to understand tafuri's thesis that they consider ad a critical theory for Korean Architecture. Double contexts of Tafuri's criticism of ideology bring to light to historicize both Tafuri's historiography itself and reception of his text in Korea.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.2
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• pp.121-127
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• 2007

Frequent occurrences of a fire cause tremendous loss of human lives and their property. Recently, in order to cope with such catastrophic accidents, researches on fire-fighting robots are carried out in developed countries. Under the dangerous situations, it is sometimes impossible for fire-fighting men to access the firing place because of explosive materials, smoke, high temperature and so on. In such an environment, fire-fighting robots can be useful to extinguish the fire. It is usually very dangerous place where fire-fighting robots operate. Hence, these robots should be controlled by remote users who are for away from the firing place exploiting remote communication systems. This paper considers the communication systems between fire-fighting robots and remote users. The communication systems consist of two parts; digital packet communication systems and analog image communication systems. Digital packet communication systems transfer data packets in order to control fire-fighting robots and to check the state of the fire-fighting robots. Remote users watch the video around the fire-fighting robots by exploiting the analog image communication systems. In the future, the more prosperous the commercial communication network systems will be, the more evolved the communication systems for fire-fighting robots are.

• Journal of Korean Medicine for Obesity Research
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• v.8 no.1
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• pp.1-12
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• 2008

Adverse reactions to foods are common and increasing problems worldwide. It is important to differentiate between the different forms of adverse reactions to foods, in particular the difference between food intolerance and food allergy. Food allergy is an adverse immunologic response to food and typically rapid in onset, whereas food intolerance is consequence of a variety of non-immune mechanisms and slow in onset. It has been difficult to diagnose food intolerance because of lack of diagnosis measure. There are now effective findings to identify food intolerance, and paradigms with food allergy are shifting. Food intolerance affects virtually every part of the body-from mildly uncomfortable symptoms to severe illness. While there is no known simple 'cure' for food allergy and food intolerance, there are a number of measures that will help avoid and lessen symptoms and correct the underlying causes. We focus the diagnosis and treatment of food intolerance through various views.

• Journal of Korean society of Dental Hygiene
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• v.13 no.6
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• pp.1057-1062
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• 2013

Objectives : The purpose of this study was to investigate the possible differences in elementary schools jointed to fluoride mouth rinse plans in health centers. Methods : Students from the third to sixth grades filled out the questionnaires. Data were analyzed by the statistical package SPSS 12.0. Results : The rate of a personal toothbrush holding and toothbrushing after lunch were higher in those who rinsed their mouths with fluoride than those who did not.(p<0.05). Toothbrushing by the rolling method was more prevailing in the students who rinsed their mouths with fluoride(57.0%) and having regular dental checkup(p<0.05) than in those who did not(39.8%). Conclusions : The students who had rinsed their mouths with fluoride showed the good oral health behavior. Continuing good quality of oral health care education must be provided to the students by professional dental hygienists.

• Journal of the Korean Ceramic Society
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• v.25 no.3
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• pp.201-206
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• 1988

To investigate the effects of Mo addition on the microstructures and mechanical properties of Al_2O_3$ ceramics, two kinds of Mo particles with average sizes of 2-${\mu}{\textrm}{m}$ and 6-${\mu}{\textrm}{m}$ were used as additives. It was shown that Mo particles inhibited the grain growth of Al_2O_3$, and the smaller Mo particles were more effective. In case of 2-${\mu}{\textrm}{m}$ Mo dispersion, the bending strength and the fracture toughness were increased. Dispersion of 6-${\mu}{\textrm}{m}$ MO did not increase the strength but improved the fracture toughness a little. The toughening mechanisms of Al_2O_3$-Mo composites are thought to be the crack deflection and microcracking mechanisms.

• Journal of the Korean Ceramic Society
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• v.27 no.2
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• pp.233-243
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• 1990

For theinvestigation of MgO addition effect on 12Ce-TZP ceramics, MgO-CeO2-ZrO2 ceramics was fabricated using commercial powders under sintering condition of 130$0^{\circ}C$-1$600^{\circ}C$ for 2hr. Fully tetragonal phase could be obtained by proper heat treatment and MgO addition amount. Minor cubic phase was appeared in relatively high MgO content composition at each sintering temperature. As alloying amount of MgO increased, tetragonal stability increased and grain size decreased. Grain size dependence on MgO content was verified by SEM observation of fractured surface. Surface bloating was observed from the 2 m/o to 6m/o in the temperature range of 150$0^{\circ}C$ to 1$600^{\circ}C$. In spite of very porous microstructure owing to surface bloating, 100% TZP could be maintained in 2.0m/o MgO composition by heat treatment of 150$0^{\circ}C$. This result indicated that MgO was more powerful stabilizer than CeO2. Mechanical proprties of MgO-CeO2-ZrO2 ceramics were consistent with the stability observation of tetragonal phase very well.

• Journal of the Korean Ceramic Society
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• v.27 no.4
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• pp.501-512
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• 1990

Al2O3 and 0.25wt% MgO-doped Al2O3 powders were made from the alcohol solution of Al(NO3)3.9H2O and Mg(NO3)2.6H2O by spray pyrolysis method. Each powder was prepared at 900 and 100$0^{\circ}C$. Powders prepared at 90$0^{\circ}C$ were amorphous phase, but prepared at 100$0^{\circ}C$ wre mainly ${\gamma}$-Al2O3 crystalline form. Particle size of the MgO-doped Al2O3 powders was in the range of 0.2-2${\mu}{\textrm}{m}$, but undooped powders shwoed comparatively wider range of particle size. All the powders prepared at 900 and 100$0^{\circ}C$ were transformed to $\alpha$-Al2O3 crystalline form by calcination at 110$0^{\circ}C$ for 1hr. Each powder was sintered at 1600, 1650 and 1$700^{\circ}C$ for 2hrs. MgO-doped Al2O3 body sintering at 1$650^{\circ}C$ showed 99% of relative density but undooped Al2O3 showed 95% of relative density, even sintered at higher temperature of 1$700^{\circ}C$.

• The Journal of the Korean dental association
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• v.54 no.4
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• pp.274-283
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• 2016

Bisphosphonates are widely used mainly for the treatment of osteoporosis and bone metastasis of malignancy. Since the first report of MRONJ, there have been many studies associated, however the pathogenesis of MRONJ is not yet clear. Medication-related osteonecrosis of the jaws (MRONJ) is a serious complication associated with long-term medication therapy. It is characterized by exposed necrotic bonein the jaw, which has persisted for more than 8weeks despite continuous treatment by dentist. The mechanism of development of MRONJ is still unclear and there is no definitive standard treatment for MRONJ. The purpose of this study is to investigate the jaw bone destruction mechanism of accumulated bisphosphonates, so that we can develop therapeutic method to repair the defect and stop the destruction process. The authors performed simultaneous application of PRF(Platelet rich fibrin) and BMP-2(Bone morphogenetic protein-2) to stimulate not only soft tissue healing but also osseous regeneration. Our case series demonstrate that simultaneous application of platelet rich fibrin and bone morphogenetic protein-2 can be a treatment of choice for MRONJ.

• Women's Health Nursing
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• v.14 no.1
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• pp.28-35
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• 2008

Purpose: The study was performed to evaluate effects of aroma therapy on the anxiety, blood pressure and pulse of uterine leiomyoma patients before surgery and to apply it as the actual nursing intervention. Method: From Aug1st to Nov. 30th, 2007, the experimental group (n=30) and the control group (n=30) were selected in 1 hospital, Busan. Lavender and Bergamot oil mixed together at a 3:2 ratio was applied to the experimental group two times at 8-9 pm the day before surgery and twice 30 minutes before the surgery. Anxiety, VAS, blood pressure, and pulse were measured to evaluate the effects of aroma therapy. The data analysis was done using the SPSS/PC 12.0 program using chi-square test and t-test. Results: Hypothesis 1 was supported. The VAS of the experimental group was lower than control group after aroma therapy. Hypothesis 2 was partly supported. The systolic blood pressure and pulse of experimental group was significantly decreased, but diastolic blood pressure wasn't difference. The VAS, systolic blood pressure and pulse of control group were increased. Conclusion: The study verified that the aroma therapy is a very effective nursing intervention that can reduce anxiety before surgery. It is recommended to apply aroma therapy actively to patients experiencing anxiety before surgery procedure.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.3
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• pp.190-195
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• 2009

All the failure in fatigue of torsion, bending and rolling contact, and in sliding wear begins mostly from surface. So much efforts have been invested to the surface technology which deal these problems during past decades, but the industrial demand keeps growing and more significant requirements are added to researchers and engineers. Nano crystal surface modification technology which makes the surface layers into nano crystalline, induces big and deep compressive residual stress, increases surface hardness, improves surface hardness, and make micro dimples structure on surface is an emerging technology which can break limits of current surface technology and relieve the burden of researchers and engineers. In this study, a nano crystal surface modification technology which is calling UNSM(Ultrasonic nano crystal surface modification) technology, is introduced and how it has been applied to industry to solve these failure problems is explained.