• International journal of advanced smart convergence
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• v.12 no.3
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• pp.221-232
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• 2023

Recently, due to the expansion of the logistics industry, demand for logistics automation equipment is increasing. The modern logistics industry is a high-tech industry that combines various technologies. In general, as various technologies are grafted, the complexity of the system increases, and the occurrence rate of defects and failures also increases. As such, it is time for a predictive maintenance model specialized for logistics automation equipment. In this paper, in order to secure the operational reliability of the ICT/Cold-Chain Unmanned Storage, a predictive maintenance system was implemented based on the LSTM model. In this paper, a server for data management, such as collection and monitoring, and an analysis server that notifies the monitoring server through data-based failure and defect analysis are separately distinguished. The predictive maintenance platform presented in this paper works by collecting data and receiving data based on RabbitMQ, loading data in an InMemory method using Redis, and managing snapshot data DB in real time. The predictive maintenance platform can contribute to securing reliability by identifying potential failures and defects that may occur in the operation of the ICT/Cold-Chain Unmanned Storage in the future.

• Atmosphere
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• v.33 no.4
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• pp.387-398
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• 2023

The double Fourier series (DFS) spectral dynamical core is evaluated for the two idealized test cases in comparison with the spherical harmonics (SPH) spectral dynamical core. A new approach in calculating the meridional expansion coefficients of DFS, which was recently developed to alleviate a computational error but only applied to the 2D spherical shallow water equation, is also tested. In the 3D deformational tracer transport test, the difference is not conspicuous between SPH and DFS simulations, with a slight outperformance of the new DFS approach in terms of undershooting problem. In the baroclinic wave development test, the DFS-simulated wave pattern is quantitatively similar to the SPH-simulated one at high resolutions, but with a substantially lower computational cost. The new DFS approach does not offer a salient advantage compared to the original DFS while computation cost slightly increases. This result suggests that the current DFS spectral method can be a practical and alternative dynamical core for high-resolution global modeling.

• Journal of Korean society of Dental Hygiene
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• v.23 no.4
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• pp.311-321
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• 2023

Objectives: The purpose of this study was conducted an in-depth analysis of the subjective oral status and oral care needs according and problems of the elderly. Methods: A phenomenological research method was from April 13 to 30, 2023, 15 elderly people aged 65 or older in Gwangju and Jeolla regions were surveyed. Results: He was experiencing oral changes such as difficulty chewing, dry mouth and indigestion, sensitive teeth, smell of fear and feeling sensitive when eating sweet or cold food. They were burdened by the financial difficulties of dental treatment costs, the inconvenience caused by frequent visits, and the pain experienced during treatment. Realized the need for necessity of oral care education, and their confidence was restored through dental treatment. It was necessary the image recovery of dentistry, and they wanted to maintain oral health through the expansion of treatment health insurance. Conclusions: Consequently, it is necessary to develop a practical oral health management program for the elderly based on social communication regarding of the elderly and to expand health insurance coverage.

• Journal of Korean society of Dental Hygiene
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• v.22 no.6
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• pp.563-572
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• 2022

Objectives: The purpose of this study is to provide basic data for elucidating the clinical experiences of nursing assistants working at dental clinics and for establishing the bases necessary for building a safe working environment for the staff at dental clinics. Methods: From March 28 to August 20, 2022, the study conducted in-depth interviews with nursing assistants working with dental hygienists in dental clinics. The collected data were analyzed using the phenomenological method. Results: The study analyzed the meanings associated with the dental clinical assistance work experiences of nursing assistants in dental clinics. A total of 98 semantic words and 9 sub-categories were extracted, which were ultimately categorized into 4 central meanings: 'imperfect reality', 'work without boundaries', 'putting oneself in someone else's shoes', and 'symbiosis'. Conclusions: The nursing assistants were exposed to an environment where they needed to perform delegated treatment procedures even when they lacked dental work competency. They recognized their gaps in learning and the necessity for designated roles as clinical assistants. Thus, it is necessary to review the allocation and expansion of the work roles of dental practitioners based on the practical and rational realities in dental practice.

• Journal of Korean Port Research
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• v.12 no.1
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• pp.75-86
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• 1998

To design a coastal structure in the nearshore region, engineers must have means to estimate wave climate. Waves, approaching the surf zone from offshore, experience changes caused by combined effects of bathymetric variations, interference of man-made structure, and nonlinear interactions among wave trains. This paper has attempted to find out the effects of two of the more subtle phenomena involving nonlinear shallow water waves, amplitude dispersion and secondary wave generation. Boussinesq-type equations can be used to model the nonlinear transformation of surface waves in shallow water due to effect of shoaling, refraction, diffraction, and reflection. In this paper, generalized Boussinesq equations under the complex bottom condition is derived using the depth averaged velocity with the series expansion of the velocity potential as a product of powers of the depth of flow. A time stepping finite difference method is used to solve the derived equation. Numerical results are compared to hydraulic model results. The result with the non-linear dispersive wave equation can describe an interesting transformation a sinusoidal wave to one with a cnoidal aspect of a rapid degradation into modulated high frequency waves and transient secondary waves in an intermediate region. The amplitude dispersion of the primary wave crest results in a convex wave front after passing through the shoal and the secondary waves generated by the shoal diffracted in a radial manner into surrounding waters.

• Advances in nano research
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• v.14 no.6
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• pp.575-590
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• 2023

Many of small-scale devices should be designed to tolerate high temperature changes. In the present study, the states of buckling and stability of nano-scale cylindrical shell structure integrated with piezoelectric layer under various thermal and electrical external loadings are scrutinized. In this regard, a multi-layer composite shell reinforced with graphene nano-platelets (GNP) having different patterns of layer configurations is modeled. An outer layer of piezoelectric material receiving external voltage is also attached to the cylindrical shell for the aim of observing the effects of voltage on the thermal buckling condition. The cylindrical shell is mathematically modeled with first-order shear deformation theory (FSDT). Linear elasticity relationship with constant thermal expansion coefficient is used to extract the relationship between stress and strain components. Moreover, minimum virtual work, including the work of the piezoelectric layer, is engaged to derive equations of motion. The derived equations are solved using numerical method to find out the effects of temperature and external voltage on the buckling stability of the shell structure. It is revealed that the boundary condition, external voltage and geometrical parameter of the shell structure have notable effects on the temperature rise required for initiating instability in the cylindrical shell structure.

• Elastomers and Composites
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• v.37 no.4
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• pp.234-243
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• 2002

A general scheme of a rubber structure is proposed. Using the thermomechanical method(TMA), some changes in the molecular and topological structures for uncured and cured, and unfilled and filled rubbers during processing are shown. In our investigations as region it is understood a complex structure, which is expressed at the thermomechanical curve(TMC) as a zone differed from others in thermal expansion properties. This zone is between the noticed temperatures of relaxation transitions, usually on the level like those determined by DMTA at 1Hz. These regions, which shares, are not stable, and differ in molecular-weight distribution(MWD) of chain fragments between the junctions. Differences in dynamics of the formation of the molecular and topological structures of a vulcanizate are dependent on the rubber formulation, mixing technology and curing time. Some of characteristics of these regions correlate with mechanical properties of vulcanizates what is shown for NR rubbers containing ENR or CPE as a polymeric additive. It is well known that the state of order influences diffusivity of low-molecular substances into the polymer matrix. Because of this, the two topological amorphous regions should influence the distribution of the ingredients and resulting in rubber compounds' heterogeneity, and related properties of cured rubber. Investigation of this problem is expected to be, in the future, one of the essential factors in determining further improvement of polymeric materials properties by compounding with additives and in reprocessing of rubber scrap.

• Journal of Korean Medical Ki-Gong Academy
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• v.21 no.1
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• pp.22-42
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• 2022

Objective : The researcher participated in the visiting treatment project organized by OO City in 2020 and showed the advantages of visiting Korean Medicine, so I would like to report it. Methods : A comprehensive Korean Medicine intervention method was performed for each symptom, and changes in basic physical strength were observed through vital signs, NRS, Single Leg Stance (SLS), and Chair Stand Test (CST) tests. Results : It can be seen that the NRS level, a pain scale for chronic pain, generally decreased at the last treatment compared to the beginning of treatment. Satisfaction with Project Information (PI) was relatively low at 3.20±1.30, but Ease of Participation (EoP), Intention to Participate Again (IPA), Expansion of Project (ExP), and Overall Satisfaction (OS) were high at 5.00±0.00. Conclusions : Summarizing the advantages of visiting Korean Medicine is that the treatment satisfaction for chronic pain is high, the patient's satisfaction is high, the treatment tool is easy to carry, and various visiting treatment services can be implemented.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.5
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• pp.1516-1539
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• 2022

This article shows a set of physical information fusion IoT systems that we designed for smart buildings. Its essence is a computer system that combines physical quantities in buildings with quantitative analysis and control. In the part of the Internet of Things, its mechanism is controlled by a monitoring system based on sensor networks and computer-based algorithms. Based on the design idea of the agent, we have realized human-machine interaction (HMI) and machine-machine interaction (MMI). Among them, HMI is realized through human-machine interaction, while MMI is realized through embedded computing, sensors, controllers, and execution. Device and wireless communication network. This article mainly focuses on the function of wireless sensor networks and MMI in environmental monitoring. This function plays a fundamental role in building security, environmental control, HVAC, and other smart building control systems. The article not only discusses various network applications and their implementation based on agent design but also demonstrates our collaborative information fusion strategy. This strategy can provide a stable incentive method for the system through collaborative information fusion when the sensor system is unstable in the physical measurements, thereby preventing system jitter and unstable response caused by uncertain disturbances and environmental factors. This article also gives the results of the system test. The results show that through the CPS interaction of HMI and MMI, the intelligent building IoT system can achieve comprehensive monitoring, thereby providing support and expansion for advanced automation management.

• Journal of the Daesoon Academy of Sciences
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• v.23
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• pp.153-192
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• 2014

This article's purpose is to overcome the inadequacy of deliberative democracy for communication on the basis of Haewonsangsaeng. The inadequacy of deliberative democracy for communication is presented as the following two. First, as deliberative democracy treats civic virtue as instrumental thing, deliberative democracy is still in moral solipsism. Second, as deliberative democracy doesn't consider 'the inequality of power' among diverse political positions, the project of deliberative democracy for communication ends up in the exposure of the inequality of power among diverse political positions. Sangsaeng in Haewonsangsaeng concerned with inter-relationship over individualism treats civic virtue as original motility. In this context, Sangsaeng in Haewonsangsaeng is the alternative notion to overcome the first inadequacy of deliberative democracy for communication. Haewon in Haewonsangsaengas is the condition for Sangsaeng. and Haewon's method is to exclude or to eliminate the structural frame of Sanggeuk meaning mutual conflict and antagonism. This article presents two structural frame of Sanggeuk. First, First structural obstacle as internal obstacle is suggested through analyzing pluralism on the basis of existential philosophy. The result of the analysis is the 'antagonism' between the hegemonical value and the peripheral value. Second structural obstacle as external obstacle is the extinction of public sphere caused by the growth of market and the expansion of bureaucracy.