A 3 month nutrition and exercise program improved hallux strength among senior daycare center users in Korea: a cluster randomized controlled trial.

Introduction: With a growing aging population, the focus on the health and well-being of older adults, especially in preventing falls, becomes crucial. This 3 month study, initiated in July 2022, aimed to assess the impact of a nutrition and exercise program in senior daycare centers in Chuncheon, South Korea.

Methods: A 3 month study, beginning in July 2022, included 204 older adults from 10 senior daycare centers in Chuncheon, South Korea.

Native defect clustering-induced carrier localization centers leading to a reduction of performance in GaInN/GaN quantum wells.

In this study, we aimed to better understand the mechanism for creating carrier localization centers (CLCs) in GaInN/GaN quantum wells (QWs) and examine their impacts on device performance. Particularly, we focused on the incorporation of native defects into the QWs as a main cause of the mechanism behind the CLC creation. For this purpose, we prepared two GaInN-based LED samples with and without pre-trimethylindium (TMIn) flow-treated QWs.

Investigation and direct observation of sidewall leakage current of InGaN-Based green micro-light-emitting diodes.

Electrical and optical characteristics of InGaN-based green micro-light-emitting diodes (µLEDs) with different active areas are investigated; results are as follows. Reverse and forward leakage currents of µLED increase as emission area is reduced owing to the non-radiative recombination process at the sidewall defects; this is more prominent in smaller µLED because of larger surface-to-volume ratio. Leakage currents of µLEDs deteriorate the carrier injection to light-emitting quantum wells, thereby degrading their external quantum efficiency.

In vitro antidiabetic, antioxidant, antimicrobial, and cytotoxic activity of Murraya koenigii leaf extract intercedes ZnO nanoparticles.

Nanotechnology is an emerging field with tremendous potential and usage of medicinal plants and green preparation of nanoparticles (NPs) is one of the widely explored areas. These have been shown to be effective against different biological activities such as diabetes mellitus, cancer, antioxidant, antimicrobial, etc. The current studies focus on the green synthesis of zinc NPs (ZnO NPs) from aqueous leaf extract of Murraya koenigii (MK).

[Job Analysis of Nurse Care Coordinators for Chronic Illness Management in Primary Care Settings: Using Developing a Curriculum Process].

Purpose: This study aimed to conduct a job analysis of nurse carecoordinators and to identify the frequency, importance and difficulty of each task of their job.

Methods: A committee for developing a curriculum (DACUM) was formed and members of the committee defined nurse care coordinators' jobs and enumerated the duties, tasks and task elements by applying the DACUM technique. Then nurse care coordinators enrolled in the pilot project evaluated the frequency, importance and difficulty of each task.

Metabolic labeling of glycans with isotopic glucose for quantitative glycomics in yeast.

Changes in glycan levels could directly affect the biochemical properties of glycoproteins and thus influence their physiological functions. In order to decode the correlation of glycan prevalence with their physiological contribution, many mass spectrometry (MS) and stable isotope labeling-based methods have been developed for the relative quantification of glycans. In this study, we expand the quantitative glycomic toolbox with the addition of optimized Metabolic Isotope Labeling of Polysaccharides with Isotopic Glucose (MILPIG) approach in baker's yeast (Saccharomyces cerevisiae).

Identifying the cause of thermal droop in GaInN-based LEDs by carrier- and thermo-dynamics analysis.

This study aims to elucidate the carrier dynamics behind thermal droop in GaInN-based blue light-emitting diodes (LEDs) by separating multiple physical factors. To this end, first, we study the differential carrier lifetimes (DCLs) by measuring the impedance of a sample LED under given driving-current conditions over a very wide operating temperature range of 300 K-500 K. The measured DCLs are decoupled into radiative carrier lifetime (τ) and nonradiative carrier lifetime (τ), via utilization of the experimental DCL data, and then very carefully investigated as a function of driving current over a wide range of operating temperatures.

Understanding Facilitators and Barriers of Online Cancer Information Utilization among Cancer Survivors and their Families: Focus on the Theory of Planned Behavior.

Objective: Cancer survivors have various health care needs and are willing to be proactive with their health maintenance. Online information would be a useful resource to guide cancer survivors and their family members. Therefore, identifying the factors that influence Internet searching behaviors among cancer survivors and their family members is a first step toward providing better health care services for cancer care.

A pilot study of team-based primary health care for people with disabilities in South Korea.

To assess the feasibility of a primary health care (PHC) project for people with disabilities (PwDs) in South Korea, participants' experiences and perceptions were explored using the Analysis of Determinants of Policy Impact (ADEPT) model as a guide. Three focus group interviews and three one-on-one interviews were administered, and a directed content analysis was conducted based on four determinants from the ADEPT model. The findings showed that the project goal should be specified and reviewed periodically by participants.

How Much Do Older Adults Living Alone in Rural South Korea Know About Dementia?

Objectives: This study aimed to examine the level of dementia knowledge of older Korean adults living alone in rural areas and to identify related factors.

Methods: A cross-sectional descriptive design was applied. The participants were 231 older adults living alone who were recruited from 12 of the 13 primary health care posts in the rural area of Chuncheon.

One-year mortality among newly admitted older patients in a long-term care hospital in South Korea.

Objectives: Older Korean people's admission to long-term care (LTC) hospitals is increasing. This study aimed to investigate one-year mortality and related factors among older patients admitted to a LTC hospital.

Methods: Medical records of 330 patients admitted to a LTC hospital in 2014 were reviewed.

Optoelectronic Performance Variations in InGaN/GaN Multiple-Quantum-Well Light-Emitting Diodes: Effects of Potential Fluctuation.

We investigate the cause of the optoelectronic performance variations in InGaN/GaN multiple-quantum-well blue light-emitting diodes, using three different samples from an identical wafer grown on a -plane sapphire substrate. Various macroscopic measurements have been conducted, revealing that with increasing strain in the quantum wells (QWs), the crystal quality improves with an increasing peak internal quantum efficiency while the droop becomes more severe. We propose to explain these variations using a model where the in-plane local potential fluctuation in QWs is considered.

Factors associated with mortality risk in critical care patients treated with veno-arterial extracorporeal membrane oxygenation.

Objectives: To identify factors associated with mortality in patients treated with veno-arterial extracorporeal membrane oxygenation (VA-ECMO) and to validate the discrimination of the risk assessment tools to predict mortality.

Background: VA-ECMO is a rescue therapy for patients with life-threatening cardiac failure, but mortality remains high.

Methods: In this retrospective study, we reviewed the medical records of adult patients who underwent VA-ECMO in an intensive care unit of a university hospital, between 2009 and 2013.

Designing an Internet-Based Intervention Tailored to Psychological Factors for CVD Risk Reduction: Role of Stress and Anger.

Purpose: To examine the mediating role of occupational stress on the relationship of anger expression to cardiovascular disease (CVD) risk using Framingham risk score equation in Korean adults with metabolic syndrome.

Methods: This cross-sectional study was a secondary analysis of baseline data from a longitudinal study conducted in 91 Korean male workers. Psychological variables were assessed using structured questionnaires.

Study on the biodegradation of perfluorooctanesulfonate (PFOS) and PFOS alternatives.

Objectives: In this study, we investigated the biodegradation features of 4 perfluorooctanesulfonate (PFOS) alternatives developed at Changwon National University compared to those of PFOS.

Methods: Biodegradation testing was performed with microorganisms cultured in the good laboratory practice laboratory of the Korea Environment Corporation for 28 days following the Organization for Economic Cooperation and Development guidelines for the testing of chemicals (Test No. 301 C).

Effects of an empowerment program for self-management among rural older adults with hypertension in South Korea.

Objective: This study aimed to examine the effects of an empowerment program for hypertension self-management among rural older adults in South Korea.

Design: A pretest-posttest controlled design for a 12-month hypertension self-management program with assessments at commencement, 6 months and 12 months.

Setting: Two subsistence farming areas.

Direct synthesis of pyrazoles from esters using tert-butoxide-assisted C-(C=O) coupling.

This paper describes the direct synthesis of pyrazoles from esters that comprises two sequential reactions: tert-butoxide-assisted C-C(=O) coupling reaction to yield β-ketonitrile or α,β-alkynone intermediates, and condensation by hydrazine addition. The method reported allows for easy control of the regioselectivity and structure of substituents at N-1, C-3, C-4 and/or C-5 positions.

Older adults' perception of chronic illness management in South Korea.

Objectives: Despite the recent emphasis on a patient-centered chronic care model, few studies have investigated its use in older adults in South Korea. We explored how older Korean adults perceive and cope with their chronic illness.

Methods: We conducted focus group interviews in Seoul, Korea in January 2010.

Spatiotemporal path discontinuities of wavepackets propagating across a meta-atom.

The realization of phase discontinuities across metasurfaces has led to a new class of reflection and refraction. Here we present theory and experiment on the discontinuous propagation of wavepackets across subwavelength-thickness meta-atoms. Using acoustic waves, we observe the process of wavepackets traversing a meta-atom with abrupt displacements, which appear as path discontinuities on a space-time diagram.

Biodegradation of perfluorooctanesulfonate (PFOS) as an emerging contaminant.

Perfluorooctanesulfonate (PFOS) is a compound of global concern because of its persistence and bioaccumulation in the environment. Nevertheless, little is known of the potential for PFOS biodegradation, even though the importance of characterizing the function and activity of microbial populations detected in the environment has been discussed. This study focused on the biodegradation of PFOS by a specific microorganism.

Psychometric evaluation of a Korean version of the 8-item Medication Adherence Scale in rural older adults with hypertension.

Objective: To examine the psychometric properties of a structured self-reported 8-item Korean-version Morisky Medication Adherence Scale (MMAS-K) among rural older adults with hypertension.

Design: Cross-sectional descriptive survey.

Setting: A rural community comprising three primary health care posts in Gangwon Province, South Korea.

Optical characterization of Eu3+ doped ZnO nanocomposites.

A rare-earth metal ion (Eu3+) doped ZnO nanocomposites have been successfully synthesized by employing wet chemical procedure using multi-wall carbon nanotubes (MWCNT's) as removable template. The preparation was carried out by immersing empty and dried MWCNT's in a stoichiometric composition of zinc nitrate and europium nitrate solution followed by filtration and sintering. The synthesized Eu3+ doped ZnO nanocomposites were characterized by means of different characterization techniques namely XRD, SEM, EDS, FT-IR and Raman spectroscopy.

Porphyrin-POSS molecular hybrids.

Porphyrin-POSS hybrid: Porphyrin-POSS molecular hybrid composites (see scheme; POSS = polyhedral oligomeric silsesquioxanes) were synthesized and structurally characterized, allowing the realization of truly homogenous dispersion of basic functional building blocks between organic and inorganic components at the molecular level. These materials allow the optimization of aggregation/association behavior and thus the functional optical properties of the porphyrinato zinc compounds.

Enhancement in the microstructure and photoluminescence properties of YVO4:Eu3+ by Al doping.

Al contents have been doped as a sensitizer to improve the luminescent brightness, and the conventional solid state reaction method has been used to synthesize the phosphors. Al doping effects on the microstructures of YVO4:Eu3+ phosphors were measured by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The luminescent characteristics were characterized by photoluminescence excitation (PLE) and emission (PL) measurements.

Photoluminescence properties of NaSr(P, V)O4:Eu3+ phosphors.

Eu3+ activated NaSr(P,V)O4 phosphors have been synthesized using solid state reaction method and further characterized for their structure and optical properties using different techniques such as X-ray diffraction, scanning electron microscopy, photolumniscenec excitation, emission, and chromaticity coorrdinate analysis, etc. Material shows a broad excitation peak (monitored for lambda(ems) = 613 nm) lying in the 300-360 nm region and gives intense transitions (lambda(exc) = 320 nm) namely 5D0 --> 7F1 at 590 nm, 5D0 --> 7F2 at 613 nm, 5D0 --> 7F3 at 650 nm, and 5D0 --> 7F4 at 700 nm due to Eu3+ ion. Our results show that replacement of the PO4(3-) ions with isomorphic VO4(3-) ions improves the structural stability and the overall intensity of the emission.