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고주파수분센서(FDR)를 활용한 콘크리트 단위수량 평가에 관한 실험적 연구
이승엽 ( Lee¸ Seung-yeop ),양현민 ( Yang¸ Hyun-min ),이한승 ( Lee¸ Han-seung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
The unit-water content has a major problem in concrete structures which leads to micro cracks on the concrete during drying time. Thus, the compressive strength and durability of the concrete structures are significantly reduced. Several techniques have been developed to measure the unit-water content in concrete structures such as heating drying, unit volume mass, and capacitance measurements. However, these techniques have problems in during measurement such as longer time, expensive and difficult in analysis of data. Frequency Domain Reflectivity (FDR) is one of the sensors which used to measure the water content. This method has several advantages including easy to measure, inexpensive, and capable of measuring moisture in real time. In this study, an attempt has been made to evaluate the unit-water content in concrete using the FDR sensor and interpret the data with deep learning method.
Seungyeop Lee,Dong-Kwon Rhee 고려인삼학회 2017 Journal of Ginseng Research Vol.41 No.4
Ginseng effectively regulates the immune response and the hormonal changes due to stress, thus maintaining homeostasis. In addition to suppressing the occurrence of psychological diseases such as anxiety and depression, ginseng also prevents stress-associated physiological diseases. Recent findings have revealed that ginseng is involved in adjusting the hypothalamicepituitaryeadrenal axis and controlling hormones, thus producing beneficial effects on the heart and brain, and in cases of bone diseases, as well as alleviating erectile dysfunction. Recent studies have highlighted the potential use of ginseng in the prevention and treatment of chronic inflammatory diseases such as diabetes, rheumatoid arthritis, and allergic asthma. However, the mechanism underlying the effects of ginseng on these stress-related diseases has not been completely established. In this review, we focus on the disease pathways caused by stress in order to determine how ginseng acts to improve health. Central to our discussion is how this effective and stable therapeutic agent alleviates the anxiety and depression caused by stress and ameliorates inflammatory diseases.
Effects of Tinnitus Sound Therapy depending on Air- and Bone-Conduction Transducers
Seungyeop Jeong,In-Ki Jin 한국청각언어재활학회 2020 Audiology and Speech Research Vol.16 No.2
Purpose: The purpose of this study was to determine to compare the effects of sound therapy depending on air- and bone-conduction transducers (ACT and BCT). Methods: Participants were twenty adults who have diagnosed as subjective tinnitus in this study. All participants conducted a sound therapy using the level of mixing point for three months. Participants were randomly assigned to different groups, such as the ACT group, or BCT group. To identify the effects of sound therapy, Korean tinnitus primary function questionnaire (K-TPFQ) and visual analogue scale (VAS) were administered at pre- and post-treatment (3 months) sessions. Results: In a result of mixed model analysis of variance, all subcategories for VAS showed significant decrements of scores to the measurement session (pre- vs. post-session), but there was no different between groups. Also, the overall and all subcategories for K-TPFQ showed significant decrements of scores to the measurement session (pre- vs. post-session), but there was no different between groups. Conclusion: As a result of this study, the sound therapy using portable hearing devices with transducers is effective for subjective tinnitus sufferers. Because the transducer type does not significantly affect effectiveness of the sound therapy, therefore, audiologists or hearing professionals may recommend transducers, which the tinnitus sufferer prefers when they consider sound therapy.
Guidance Law for Agile Turn of Air-to-Air Missile During Boost Phase
Seungyeop Han,Ji Hoon Bai,Seong-Min Hong,Heekun Roh,Min-Jea Tahk,Joongsup Yun,Sanghyuk Park 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.4
This paper proposes the guidance laws for an agile turn of air-to-air missiles during the initial boost phase. Optimal solution for the agile turn is obtained based on the optimal control theory with a simplified missile dynamic model. Angle-of-attack command generating methods for completion of agile turn are then proposed from the optimal solution. Collision triangle condition for non-maneuvering target is reviewed and implemented for update of terminal condition for the agile turn. The performance of the proposed method is compared with an existing homing guidance law and the minimum-time optimal solution through simulations under various initial engagement scenarios. Simulation results verify that transition to homing phase after boost phase with the proposed method is more effective than direct usage of the homing guidance law.
Study on the exchange reaction of HDTMA with the inorganic cations in reference montmorillonties
SeungYeop Lee,SooJin Kim 한국지질과학협의회 2003 Geosciences Journal Vol.7 No.3
The adsorption of hexadecyltrimethylamonium(HDTMA) cations on swelling layer silicates (montmorilonites)was studied by adsorption isotherms, X-ray diffraction, and electronmicroscopy. At low HDTMA concentrations, HDTMA ions startedto be adsorbed on interlayer sites of SWy montmorilonite, causinga preferential release of interlayer Na+ compared with Ca2+, whilethe lateral attraction betwen adsorbed HDTMA cations at edges orexternal surfaces highly prevailed in SAz montmorillonite. Mont-morilonite clay surfaces appeared as foliated and iregular aggre-gate structures at high HDTMA loadings. Besides the clay surfacecharge, the interlayer inorganic cations appeared to have a sub-stantial influence on the expansion behavior of silicate layers aswell as the evolution of the surface aggregates as a function ofHDTMA surface coverage.
Velocity Maximizing Suboptimal Control Law for Agile Turn of Air-to-Air Missile
Seungyeop Han,Min Ki Kim,Min-Jea Tahk,Yun-Young Kim 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
In this paper, optimal control problems considering agile turn of missile as maximizing terminal velocity at boost phase are dealt. The missile in the phase experiences dramatic variation in velocity, mass and angle of attack within finite duration. This research at first, classifies the missile models into two different cases; longitudinal motion and lateral motion, but all of the models neglect aerodynamic forces. Each model has an optimal solution known as Bang-Singular Control, and the corresponding optimal control as well as switching condition for Bang to Singular is analytically derived. After the derivation of optimal solutions, two different suboptimal control laws which are based on the optimal solutions and capable of aerodynamic forces are proposed. The first law uses the optimal solution directly while the other incorporates theoretical aerodynamic equations. A comparison between results from the proposed control laws, results from PD type control law and optimal results from a commercial optimization tool are presented and usefulness of proposed method is validated through the comparison.