• 산업기술연구
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• 제32권A호
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• pp.87-94
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• 2012

For soils with high void ratios, the inverse method of utilizing results obtained from centrifuge model test was used to find the constitutive relation of effective stress - void ratio - permeability whereas conventional oedometer test and constant rate of strain consolidation(CRS) test about settlement of interface and pore pressure and distribution with time were compared with numerically estimated values to confirm such a constitutive relation as obtained from the inverse method. As results of numerical method, the volumetric ratio and reclamation velocity were obtained for the reclamation condition.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2013년도 제46회 KOSCO SYMPOSIUM 초록집
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• pp.83-85
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• 2013

With an increase in the use of low rank coals in power plants, various operational issues were raised in the fuel storage and supply, combustion, boiler and flue gas treatment systems. In the fuel storage and supply system, the main issue is the self-heating propensity of low rank coals leading to spontaneous combustion in yard storage, transport and pulverization. This study evaluated the reactivity of various sub-bituminous and bituminous coals with oxygen at low temperatures by analyzing the temperature increase characteristics of coals under a constant flow rate of oxygen supply. The results were quantified to a self-heating index and the relation with the fuel properties were evaluated.

• 한국소음진동공학회논문집
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• 제19권10호
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• pp.1053-1061
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• 2009

The goal of this paper is to investigate the generation characteristics of the main impulsive noise sources generated by the supersonic flow discharging from a muzzle. For this, this paper investigates two fundamental mechanisms to sound generation in shocked flows: shock motion and shock deformation. Shock motion is modeled numerically by examining the interaction of a sound wave with a shock. The numerical approach is validated by comparison with results obtained by linear theory for a small disturbance case. Shock deformations are modeled numerically by examining the interaction of a vortex ring with a blast wave. A numerical approach of a dispersion-relation-preserving(DRP) scheme is used to investigate the sound generation and propagation by their interactions in near-field.

• 교육시설
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• 제1권2호
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• pp.57-64
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• 1994

The purpose of this study is to get data of architectural planning in the special school for the Blind. To this end the chilcren's learning activities were analyzed, and their characteristics were noted in relation with the corresponding rooms. The findings may be summarized as follows. i) The pattern of study activities are multivarious. ii) Variety in learning spases is required. And it needs a space which can accommodate simultaneously both static and dynamic study activities. iii) The learning space must be conveniently planned in relation to those facilities for basic life activities such as eating and washing so that the children receive training in those activities as well.

• Elastomers and Composites
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• 제58권4호
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• pp.201-207
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• 2023

Owing to their unique properties originating from slidable cross-links, polyrotaxane derivatives have potential applications as polymer electrolytes for lithium-ion batteries, lightweight polymer alloys for vehicular bodies and their glazing, elastic rubbers for tires, hydrogels for drug delivery. This article reviews the structures of polyrotaxanes comprising cyclic molecules threaded by a linear axle polymer. Next, the versatile characteristics of polyrotaxane gels, elastomers, and polymer alloys such as toughness, elasticity, and softness are discussed in relation to their supramolecular architectures. Finally, the mechanical behavior of solid ring cross-links are compared with that of conventional fixed cross-links for better understanding.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.981-984
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• 1997

This paper deals with the relation of cutting conditions and damaged layer by investigating cutting force, cutting temperature and residual stress in high speed machining. Damaged layer was measured using optical microscope on samples prepared by metallographic techniques. The scale of this damaged layer depends upon characteristics of cutting force and cutting temperature. Damaged layer depth increases with feed per tooth and radial depth. In a different another way, damaged layer remains almost unchanged according to spindle speed. Therefore, the effective method for decreasing damaged layer is that cut down feed per tooth and radial depth.

• Journal of Korean Biological Nursing Science
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• 제12권3호
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• pp.186-194
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• 2010

Purpose: This study was designed to identify the correlation among perceived health status, health behavior, activities of daily living and depression among the elderly with hypertension. Methods: The subjects consisted of 238 person aged over 65 with hypertension who live in house located in BukGu Daegu city. The Data was collected through interview with questionnaire from July, to August 10, 2010. Results: There was a significant relation between perceived health status & ADL (r=.328, p=.000) and between depression & ADL (r=-.293, p=.000). There was s significant relation between depression & perceived health status (r=-.199, p=.002). The general characteristics which significantly affected depression was sex (t=2.49, p=.013), age (F=5.882, p=.001) education (F=6.550, p=.000), occupation (t=-6.990, p=.000). Conclusion: The findings of this study provide useful information for constructing an intervention program and care for the elderly with hypertension.

• 동력기계공학회지
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• 제7권3호
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• pp.69-73
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• 2003

In this paper, the relation between displacement of piezoelectric disk and electric field was proposed. From Navier-Stokes equation and Reynold's equation, the relation between flow and gap of plate was determined. This models were further verified by experiments. Based on theoretical study and experimental verification, the proposed model between flow rate and voltage can be used in the design of mass flow controller in gas supplying system.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.648-651
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• 2013

The information generated in large-scale and complex construction projects are transferred continuously and transformed into project products on the long span life cycle. Therefore, information flow management is related with the success of project directly. However, certain characteristics of large-scale and complex construction projects make the solving the problem more difficultly. Although several information retrieval systems support the information management system, it is not suitable to grasp information flows. Hence, we developed an information retrieval system specialized with the information flow based on a preceding research. The system consists of a relation-based database and the process information transferring relation inference application module. The system enables project managers to manage the entire project process more efficiently and each project member to work their own task being served the information flow retrieval results.

• The Journal of Korean Physical Therapy
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• 제10권2호
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• pp.105-111
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• 1998

My prior questionnaire has applied to 12 male and 29 female adults over 30-69 years old suffering from lumbago fer 6 months at least or having diagnosis of lumbago. I had the following conclusions from physical characteristics and cardiopulmonary capacity of lumbago Patients caused by obesity 1) The rate of lipids in the body was rotated to the maximum heart rate in the male group of lumbago patients (P<0.01). 2) The rate of lipids in the body was related to the maximum intake of oxygen(O2) in the male group of lumbago patients(P<0.01). 3) The maximum heart rae was related to the maximum intake of oxygen in the male group of lumbago patients(P<0.01). 4) The rate of lipids in the body was related to the maximum intake of oxygen in the female group of lumbago patients(P<0.05). 5) The rate of lipids in the body showed no relation to the maximum heart rate in the female group of lumbago patients(P>0.05). 6) The maximum heart rate was related to the maximum intake of oxygen in the female group of lumbago patients(P<0.01). 7) The cardiovascular system showed no relation te the function of the lungs in the male and female groups of lumbago patients(P>0.05) 8) The lung capacity per second of lumbago patients(FEV $1.0\%$) measured less than normal adults. 9) The maximum intake of oxygen(V02max) and heart rate was less than normal adults. Thus I summarized the conclusion so follows: the cardiovascular system of lumbago patients showed no relation to their pulmonary function, and the rate of lipids in the body Showed a correlation with the maximum intake of oxygen but the rate of lipids in the body showed no relation to their pulmonary function.