• Management Science and Financial Engineering
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• v.19 no.2
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• pp.19-29
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• 2013

Refuse collection network design, one of major decision problems in reverse logistics, is the problem of locating collection points and allocating refuses at demand points to the opened collection points. As an extension of the previous models, we consider capacity and maximum allowable distance constraints at each collection point. In particular, the maximum allowable distance constraint is additionally considered to avoid the impractical solutions in which collection points are located too closely. Also, the additional distance constraint represents the physical distance limit between collection and demand points. The objective is to minimize the sum of fixed costs to open collection points and variable costs to transport refuses from demand to collection points. After formulating the problem as an integer programming model, we suggest an optimal branch and bound algorithm that generates all feasible solutions by a simultaneous location and allocation method and curtails the dominated ones using the lower bounds developed using the relaxation technique. Also, due to the limited applications of the optimal algorithm, we suggest two heuristics. To test the performances of the algorithms, computational experiments were done on a number of test instances, and the results are reported.

• Toxicological Research
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• v.33 no.2
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• pp.97-106
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• 2017

Forest bathing has beneficial effects on human health via showering of forest aerosols as well as physical relaxation. Terpenes that consist of multiple isoprene units are the largest class of organic compounds produced by various plants, and one of the major components of forest aerosols. Traditionally, terpene-containing plant oil has been used to treat various diseases without knowing the exact functions or the mechanisms of action of the individual bioactive compounds. This review categorizes various terpenes easily obtained from forests according to their anti-inflammatory, anti-tumorigenic, or neuroprotective activities. Moreover, potential action mechanisms of the individual terpenes and their effects on such processes, which are described in various in vivo and in vitro systems, are discussed. In conclusion, the studies that show the biological effectiveness of terpenes support the benefits of forest bathing and propose a potential use of terpenes as chemotherapeutic agents for treating various human diseases.

• The Journal of Korean Academy of Prosthodontics
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• v.34 no.4
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• pp.687-697
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• 1996

There has been a lot of research into the essence of the smile, but so far just a few studies have been done on the relationship between personality and smile. On the assumption that smile aesthetics are closely related to individual physical condition and psychological state, this study investigated the correlation between personality factors and smile scores. The Personality Factor Questionnaire test was administered to 60 university students (male : 30, female : 30) who have no teeth missing, no experience of orthodontic or prosthodontic treatment and good dentition. Then, portraits were taken in a full smile. Esthetic smile scores were estimated by 10 appraisers who were dentists. These scores were analyzed statistically using the SAS program. The following results were obtained. 1. Personality factors of Warmth, Stableness, Surgency, Boldness, Untroubled-adequacy, Group-dependence, Relaxation, Extraversion, Low anxiety were positively correlated to the aesthetic level of smile. 2. For females, personality factors had greater influence on smile aesthetics, whereas male smile aesthetics were less influenced by personality factors.

• Nuclear Engineering and Technology
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• v.52 no.11
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• pp.2607-2612
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• 2020

The present work was aimed to show the possibility of using hydrogel (acrylic/boric acid) for evaluation of the neutron radiation shielding. The influence of acrylic acid concentration, different gamma doses and relative contents of boric acid were studied. The physical properties and the thermomechanical stability of the studied samples were investigated. The shielding property of the composite for neutron was tested by Pu-Be neutron source (5 Ci) under room temperature. The neutron fluence rates and gamma fluxes were measured using a stilbene organic scintillator. The macroscopic effective removal cross-section Σ_R (cm^-1) of fast neutrons and total attenuation coefficient μ (cm^-1) of gamma rays has been studied experimentally. The transmission parameters, the relaxation length (??) and the half-value layer (HVL) were obtained. The obtained results indicated that the addition of boric acid to acrylic acid tends to increase the macroscopic effective removal cross-section Σ_R (cm^-1) to 0.141 compared to 0.094 of ordinary concrete.

• Macromolecular Research
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• v.9 no.3
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• pp.129-142
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• 2001

To efficiently demonstrate the molecular motion, physical properties, and mechanical properties of polycarbonates, we studied the differences between bisphenol-A polycarbonate(BPA-PC) and tetramethyl bisphenol-A-polycarbonate(TMBPA-PC) using molecular modeling techniques. To investigate the conformations of BPA-PC and TMBPA-PC and the effect of the conformation on mechanical properties, we performed conformational energy calculation, molecular dynamics calculation, and stress-strain curves based on molecular mechanics method. From the result obtained from conformational energy calculations of each segment, the molecular motions of the carbonate and the phenylene group in BPA-PC were seen to be more vigorous and have lower restriction to mobility than those in TMBPA-PC, respectively. In addition, from the results of radial distribution function, velocity autocorrelation function, and power spectrum, BPA-PC appeared to have higher diffusion constant than TMBPA-PC and is easier to have various conformations because of the less severe restrictions in molecular motion. The result of stress-strain calculation for TMBPA-PC seemed to be in accordance with the experimental value of strain-to-failure ∼4%. From these results of conformational energy calculations of segments, molecular dynamics, and mechanical properties, it can be concluded that TMBPA-PC has higher modulus and brittleness than BPA-PC because the former has no efficient relaxation mode against the external deformations.

• The Korean Journal of Rehabilitation Nursing
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• v.14 no.2
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• pp.95-102
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• 2011

Purpose: The purpose of this study was to analyze intervention studies related to Snoezelen (multisensory environment). Methods: Studies related to Snoezelen (multisensory environment) published between 1995 and 2010 in both Korean and International journals were systematically reviewed, and analyzed following guidelines. Based on inclusion criteria, 23 studies including 5 Korean and 18 International articles were selected. Results: Most studies were conducted in various area of research such as medicine, nursing, and occupational therapy. There was no publication related to Snoezelen (multisensory environment) in Korean nursing journals. In terms of target population, more than 65 % of the study subjects were patients with dementia, mental retardation, and learning disability. Intervention was implemented mostly in less than 30 minutes, once a week for 2 to 4 weeks. The effects on behavior, physical, and psychological contexts were assessed as outcome indicators. There was more 'positive' than 'no effect' in self-stimulatory behaviors, problem behaviors, heart rate, pain, mood state, and anxiety, whereas more 'no effect' than 'positive' in blood pressure, respiration, enjoyment, and relaxation. Conclusion: Future studies are needed to develop the protocol and outcome indicators for effective use of this new intervention in Korea.

• Journal of Fashion Business
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• v.22 no.1
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• pp.71-81
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• 2018

This study aims at exploring how the existing stereotypes of needlework, which has long been regarded as a tribute to domestic labor and hobbies which are the purview of women, have come into play in the current trend of convergence among various fields, techniques and materials. This research examines these trends based on cases in two categories applied to the fields of art and space use products. In the field of art, it can be seen that needlework is applied in a variety of ways in the overall diffusion of craftivism, which is a way of asserting opinions about politics and societies. In yarn bombing and performance art, not only do needlework experts, but also, artists of other genres, underscore their propensity of carrying out projects that take advantage of the basic principles of needlework and various physical properties. Various needlework projects applied to the space use products showed the tendency to interact with the spectator or the user as a basic element through examples of playscape, which has the function of being used for relaxation and play. The study was able to confirm the tendency of interior products, which are made from needlework to furniture and tableware directly, and the tendency of materials' expansion. Based on this research, we are going to explore the possibilities for diverse new fusion attempts in fashion and textiles, as well as art, craft and design fields, in the future.

• Journal of Korean Biological Nursing Science
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• v.15 no.2
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• pp.65-73
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• 2013

Purpose: The purpose of this study was to review the literature on music intervention for neurological patients in Korea and to explore the effect of music intervention on functional rehabilitation of neurological patients. Methods: This systematic review examined literature from 2005 to 2010. The existing literature was searched in the electronic databases of RISS and KISS using the following keywords: music, rhythmic movement, stroke, brain injury, dementia, Parkinson, spinal cord injury. Seventy-seven studies were founded through the database. After The exclusion of duplicates, case studies, literature review, and irrelevant studies, nine studies were included for analysis. Results: They included nine quasi-experimental studies. The medical diagnoses of the study participants were stroke, dementia, brain injury, and spinal cord injury. Among nine studies, only two studies were conducted in the nursing area. Eight studies used comprehensive music programs composed of health education, gait training, vocal training, or relaxation therapy, and these comprehensive programs were effective in the areas of physical and psychosocial treatment. Seventeen sessions were provided on average throughout intervention, and the average duration of each session was 49.4 minutes. Conclusion: Comprehensive music intervention can be implemented in nursing care for patients with neurological problem.

• Research in Community and Public Health Nursing
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• v.12 no.1
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• pp.261-268
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• 2001

Recently, social concerns about addiction problems not only to substances like alcohol and drug but also to gambling or internet have been increasing. Addiction is caused by a combined influence of biological, psychological. and social factors. However, addiction may also occur due to weak will-power or poor education on addiction. Even though addicted behavior provides temporal mood change such as euphoria, satisfaction. or relaxation. it leads to serious physical and mental disorder of the addicted person and its family members, which possibly results in fatal consequences. Nurses are in an environment to meet and take care of those who are addicted or vulnerable to addiction in order to help the clients to recover or to prevent people from addiction. Despite the importance of nurses role in addiction problems, there is a lack of consistency of addiction is often interchangeably used with other similar concepts in the society. In this study, a concept analysis of addiction was performed to more clearly and comprehensively understand addiction and to develop effective nursing intervention methods for addicted clients. The analysis is conducted according to a series of processes described by Walker and Avant. The defining attributes of addiction identified in this study are as follows: 1) existence of object 2) control loss 3) withdrawal symptoms 4) continued use despite adverse consequences.

• Biomolecules & Therapeutics
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• v.20 no.3
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• pp.352-356
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• 2012

The present study was undertaken to determine whether ethanol influences on the agonist-induced vascular smooth muscle contraction and, if so, to investigate the related mechanism. The measurement of isometric contractions using a computerized data acquisition system was combined with molecular experiments. Ethanol significantly inhibited thromboxane $A_2$ mimetic-induced contraction with intact endothelial function, but there was no relaxation on thromboxane $A_2$ mimetic U-46619-induced contraction irrespective of endothelium suggesting that the pathway such as Rho-kinase activation, $Ca^{2+}$ entry or thin filament regulation was not affected. In addition, ethanol didn't decrease thromboxane $A_2$ mimetic-induced increase of phospho-myosin phosphatase targeting subunit protein 1 (pMYPT1) or pERK1/2. Interestingly, ethanol didn't inhibit significantly phorbol ester-induced contraction in denuded muscles suggesting that thin filament regulation is less important on the ethanol-induced regulation in the muscle than endothelial NO synthesis. In conclusion, this study provides the evidence and possible related mechanism concerning the effect of ethanol on the agonist-dependent contraction in rat aortic rings with regard to endothelial function.