• Journal of Korean Medical classics
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• v.24 no.3
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• pp.75-86
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• 2011

We would like to understand we should follow the rules of nature by having 'bupaeumyang(法於陰陽) to the "sanggocheonjinron "上古天眞論" and the healthy living shall be made based on the balance of yin and yang, and in harmony with the nature mentioned in Sagijoshindaeron "四氣調神大論" so it is considered that this is the Yangsaeng(養生) usually mentioned in Oriental medicine. Therefore, we would like to present the exercise methods according to the season and would like to propose two most basic Yangsaeng methods of the gymnastics Yangsaeng method(體操養生方法) and the massage Yangsaeng method(按摩養生方法) stimulating Musculoskeletal(筋骨格) and acupoints (血位) directly by the caregivers among the various infants exercise in order to help their physical growth and development and to promote the interaction between parents and children.

• The Journal of the Korea Contents Association
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• v.12 no.8
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• pp.366-372
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• 2012

In most of construction work, especially mat foundation construction, it is very important that accidents be prevented at early aged construction stage. To reduce the risk of accidents, it is necessary to choose the curing method to provide instructions for safety forming work by proper curing of concrete after placing. Therefore, this paper has proposed a designation algorithm of curing method for representing curing type and period by analyzing the transient hydration heat solution, focusing on mat foundation construction. This has been implemented, moreover, using an object oriented programming language to develop structural analysis system taking account crack index. In addition, we present in this paper a safety curing management system developed to assess risk during forming work.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.273-274
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• 2009

The curing method used on domestic sites for checking the concrete compressive strength of a structure. The curing method used for testing the specimens must be the standard ponding curing method (20${\pm}$%$2^{\circ}$C). However, because in-placed concrete is exposed to open air and cured under the seasonal temperature changes, the compressive strength of a real structure is different from the tested compressive strength. Therefore the curing method suggested in this research, which sets the internal conditions of the structural specimens as the conditions of the applied curing method. this thesis suggests the specimen curing method that most closely re-enacts the compressive strength of the concrete used on the structural specimens

• KSCE Journal of Civil and Environmental Engineering Research
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• v.35 no.2
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• pp.465-470
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• 2015

The curing of epoxy asphalt mixture depends on the chemical reaction of epoxy resin and the curing agent. The curing level of epoxy asphalt mixture needs to be predicted in order to decide traffic opening time and to establish further construction plans. In this study, chemical analysis of the prediction model was executed to expand the applicability of the previous prediction model. Consequently, the curing level prediction model of epoxy asphalt concrete mixture was proposed using the concentration ratio and the acid value ratio. According to the results of outdoor curing experiments, the final prediction model showed that the correlation coefficient is greater than 0.971. Precise prediction results of different composition epoxy asphalt were obtained by reflecting the chemical composition ratios in the curing level prediction model.

• Journal of the Korean Geotechnical Society
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• v.16 no.6
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• pp.59-68
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• 2000

현재까지 진동이 양생중인 콘크리트에 미치는 영향을 알아보기 위해 수행된 대부분의 연구에서는 콘크리트 공시체나 콘크리트 블록에 대해 100Hz 미만의 주주파수를 가지는 충격진동이나 진동테이블을 이용한 진동을 가한 후 콘크리트의 강도 변화를 평가하는 방법이 사용되었다. 이 연구에서는 발파진동이 양생중인 라이닝 콘크리트에 미치는 영향을 알아보기 우해 실험실 충격진동 시험과 터널 현장에서의 발파진동 시험을 수행하였다. 터널발파진동과 유사한 100~300Hz의 주주파수를 가지 충격진동을 각각 재령 3, 7, 12 시간에 다한 실험실 시험결과 2cm/sec의 진동속도는 모르타르 라이닝의 P파속도를 증가시키지만, 5 cm/sec, 10cm/sec의진동의 모르타르 라이닝의 P파 속도를 감소시킬 수 있는 것으로 나타났다. 양생기간동안 2.5 cm/sec 이하의 발파진동이 가해진 양생중인 라이닝 콘크리트는 진동을 가하지 않고 양생시킨 콘크리트 공시체에 비해 압축강도가 더 큰 값을 나타내었다. 재령 5시간에 콘크리트 라이닝애 대한 소규모 시험발파로 발파진동을 가한 콘크리트 시료와 진동을 가하지 않고 터널 내에서 양생시킨 공시체에 대해 압축강도를 비교한 결과 콘크리트의 강도 및 탄성파 속도를 저하시킬 수 있는 진동수준은 3~4cm/sec 인 것 으로 나타났다.로 나타났다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.20 no.2
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• pp.67-73
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• 2016

When assessing crack initiation of fiber reinforced concrete, usually tensile strength or flexural strength is becomes indicator, but also depend on the curing effect take place during the production of specimen. In general, after conducting concrete specimen is cured by water at temperature $20{\pm}3^{\circ}C$ in laboratory, and accomplished the assessment of strength, but most of concrete structure is kept in drying condition after moist curing through the prescribed period. However, unlike these trends that technological advances have been made, influence of the difference of curing method on crack strength is not yet clear. Therefore, in this study, it is examined on the effect of curing methods affecting the mechanical property of fiber reinforced concrete, especially crack strength.

• Journal of the Korea Concrete Institute
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• v.17 no.4 s.88
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• pp.551-558
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• 2005

The setting and hardening of concrete is accompanied with nonlinear temperature distribution caused by development of hydration heat of cement. Especially at early ages, this nonlinear distribution has a large influence on the crack evolution. As a result, in order to predict the exact temperature history in concrete structures it is required to examine thermal properties of concrete. In this study, the convection heat transfer coefficient which presents thermal transfer between surface of concrete and air, was experimentally investigated with variables such as velocity of wind, curing condition and ambient temperature. At initial stage, the convection heat transfer coefficient is overestimated by the evaporation quantity. So it is essential to modify the thermal equilibrium considered with the boiling effect. From experimental results, the convection heat transfer coefficient was calculated using equations of thermal equilibrium. Finally, the prediction model for equivalent convection heat transfer coefficient including effects of velocity of wind, curing condition, ambient temperature and boiling effects was theoretically proposed. The convection heat transfer coefficient in the proposed model increases with velocity of wind, and its dependance on wind velocity is varied with curing condition. This tendency is due to a combined heat transfer system of conduction through form and convection to air. From comparison with experimental results, the convection heat transfer coefficient by this model was well agreed with those by experimental results.

• 한국체육학회지인문사회과학편
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• v.57 no.1
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• pp.347-367
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• 2018

The purpose of this study is to explore the meaning of YangSaeng exercise as a recreational activity for older adults. Twelve older adults who participated in the 'YangSaeng Exercise' at the S Senior Welfare Service Center were interviewed through purposeful sampling method. Each participant was interviewed two times, and data were analyzed using Strauss and Corbin's(1988) grounded theory method. Centralization was appeared as 'An addiction to YangSaeng exercise' and causal conditions were appeared as 'Visiting Welfare Center' and 'Participation in YangSaeng exercise program' and situational context were appeared as 'Self-management of old ages' and 'For possession of Independent Life' as the results of Axial Coding. Moreover, arbitrational conditions were 'Coexistence of Regret and Attraction' and interaction strategies were appeared as 'Accept', 'Effort and Easing Mind' and 'Share Together'. As a result, 'Appreciation', 'YangSaeng Exercise that comes in my Life' and 'Softly Pitapat' were derived. Core category of 'Living Joyfully with comforted and eased' was selected through outline of story which means it contains Positivity and Expectations, Acceptance and Acknowledgement, Satisfaction and Appreciation, and Commitment and Hope. Based on the findings, we acknowledge that YangSaeng exercise plays a role in improving quality of life of older adults as a recreational activity. This study sheds light on the possibility of implementing 'YangSaeng Exercise' as a health promotion activity among older adults.

• Journal of the Korea Concrete Institute
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• v.23 no.2
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• pp.219-224
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• 2011

In this study, a piezoelectric smart sensor that can be embedded inside of concrete structures is developed to investigate the early stage of concrete curing. A waterproof coating is used to protect the piezoelectric sensor from moistures of concrete mixture. Also, a mortar case is utilized to encapsulate the sensor to protect it from impact loads. To estimate the strength of concrete, a self-sense guided-wave actuated sensing technique is applied. In the guided wave, its velocity is varied according to the mechanical properties of concrete such as modulus of elasticity. Because modulus of elasticity directly affects the strength of concrete, the guidedwave's velocity also affects the concrete strength development. To verify the feasibility of using the proposed approach, the smart sensor was embedded into a 100MPa concrete cylinder and the self-sense guided wave is continuously measured throughout the curing process. The measurements showed that the propagation time (TOF) of the measured guided waves gradually decreased as the curing age increased. Especially, at the early age of the curing process, the variation of the TOF was very significant. Furthermore, the results showed that there is a linear relationship between the TOF of the self-sense guided waves and the strength of concrete existed. It is safe to conclude that the proposed approach can be used very effectively in monitoring of the strength development of high strength concrete structures.

• 농업기술회보
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• v.46 no.4
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• pp.51-52
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• 2009