• Korean Journal of Mathematics
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• 제24권2호
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• pp.181-198
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• 2016

In this work, we suggest a new system of generalized nonlinear regularized nonconvex variational inequalities in a real Hilbert space and establish an equivalence relation between this system and fixed point problems. By using the equivalence relation we suggest a new perturbed projection iterative algorithms with mixed errors for finding a solution set of system of generalized nonlinear regularized nonconvex variational inequalities.

• Journal of Preventive Medicine and Public Health
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• 제56권5호
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• pp.407-412
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• 2023

Objectives: Work stress is associated with non-communicable diseases, increased healthcare costs, and decreased work productivity among employees in the information technology sector. There is a need for regular work-stress screening among employees using valid and reliable tools. The Tool to Assess and Classify Work Stress (TAWS-16) was developed to overcome limitations in existing stress assessment tools in India. This study aimed to test the reliability of TAWS-16 in a sample of managerial-supervisory employees. Methods: This observational reliability study included data from 62 employees. Test-retest and inter-method reliability were investigated using a TAWS-16 web application and interview by telephone, respectively. Kappa values and intra-class correlation coefficients were calculated. Internal consistency was assessed through Cronbach's alpha. Results: For both test-retest and inter-method reliability, the agreement for both work-related factors and symptoms suggestive of work stress exceeded 80%, and all kappa values were 0.40 or higher. Cronbach's alpha for test-retest and inter-method reliability was 0.983 and 0.941, respectively. Conclusions: TAWS-16 demonstrated acceptable reliability. It measured stressors, coping abilities, and psychosomatic symptoms associated with work stress. We recommend using TAWS-16 to holistically identify work stress among employees during periodical health check-ups in India.

• 대한조선학회논문집
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• 제45권1호
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• pp.29-41
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• 2008

The present paper provides a CFD analysis of diffraction problem for a ship with forward speed using an unsteady RANS simulation method, a WAVIS code. The WAVIS viscous solver adopting a finite volume method has second order accuracy in time and field discretizaions for the RANS equations. A two phase level-set method and a realizable ${\kappa}-{\varepsilon}$ turbulence model are adopted to compute the free surface and to meet the turbulence closure, respectively. To validate the capability of the present numerical methods for the simulation of an unsteady progressive regular wave, computations are performed for three grid sets with refinement ratio of ${\sqrt{2}}$. The main simulation is performed for a DTMB5512 model with a forward speed in a regular head sea condition. Validation of the present numerical method is carried out by comparing the present CFD results with available unsteady experimental data published in the 2005 Tokyo CFD Workshop: resistance, heave force, pitch moment, unsteady free surface elevations and velocity fields.

• 대한수학회보
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• 제36권4호
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• pp.799-808
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• 1999

We investigate when the .product of two smooth manifolds admits a weakly Lagrangian embedding. Assume M, N are oriented smooth manifolds of dimension m and n,. respectively, which admit weakly Lagrangian immersions into $C^m$ and $C^n$. If m and n are odd, then $M\;{\times}\;N$ admits a weakly Lagrangian embedding into $C^{m+n}$ In the case when m is odd and n is even, we assume further that $\chi$(N) is an even integer. Then $M\;{\times}\;N$ admits a weakly Lagrangian embedding into $C^{m+n}$. As a corollary, we obtain the result that $S^n_1\;{\times}\;S^n_2\;{\times}\;...{\times}\;S^n_k$, $\kappa$>1, admits a weakly Lagrang.ian embedding into $C^n_1+^n_2+...+^n_k$ if and only if some ni is odd.

• 대한원격탐사학회지
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• 제37권6_3호
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• pp.2011-2025
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• 2021

고해상도 위성영상 분류에서 다양한 색상을 가지는 건물들과 같이 동일한 클래스에 속하지만 색상 정보가 상이한 화소들이 클래스를 구성하는 경우에는 클래스를 대표하는 색상 정보를 결정하기가 어렵다. 본 논문에서는 클래스의 대표적인 색상 정보를 결정하는 문제를 해결하기 위해 HSV(Hue Saturation Value)의 색상 채널을 분할하고 객체 기반의 분류를 수행하는 방법을 제안한다. 이를 위해 RGB 컬러 공간의 입력 영상을 HSV 컬러 공간의 성분으로 변환한 후에 색상(Hue) 성분을 일정 간격의 서브채널로 분할한다. 각 색상 서브채널에 대해 최소거리기반의 영상 분류를 수행하고 분류 결과를 영상 분할 결과와 결합한다. 제안한 방법을 아리랑3A 위성영상에 적용한 결과 overall accuracy는 84.97%, kappa coefficient는 77.56%로 나타났고 상용 소프트웨어 대비 분류 정확도가 10% 이상 개선된 결과를 보였다.

• 한국식품영양과학회지
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• 제31권4호
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• pp.629-635
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• 2002

본 연구는 유화형 소시지와 유사한 물성을 갖는 저지방 소시지를 제조하기 위하여 실시하였다. 이전의 모델연구결과를 통해 얻은 최적조건을 저지방 육제품 제조에 적용하였으며 제조한 저지방 소시지의 pH는 6.29~6.34, 수분 74~76%, 지방<3% 및 단백질 15~18%인 반면, 유화형 소시지는 pH 6.51, 수분 56%, 지방 26.9% 및 단백질은 13.2%이었다. 친수성 콜로이드를 단독으로 첨가한 저지방 처리구는 무침가구와 비교할 때 가열수율, 보수력 및 색도에 영 향을 미치지 않았으나, CN을 첨가한 처리구의 보수력은 유화형 대조구와 KF 및 LBG를 각각 단독으로 첨가한 처리구에 비하여 오히려 낮았다. 물성특성에서는 저지 방 대조구와 CN을 첨가한 저지방 처리구가 유화형대조구보다 탄력성 및 응집성이 높았고, KF와 LBG를 각각 첨가한 처리구는 부서짐성과 경도 및 탄력성이 낮았다. KF, CN 및 LBG의 2종 내지 3종을 복합으로 첨가하여 저지방 소시지를 제조하였을 때 유화형 대조구에 비하여는 보수력은 떨어졌으나, KF와 LBG(KLL) 및 KF와 CN과 LBG(KCL)를 복합으로 첨가한 처리구는 단독 첨가구에 비하여 보수력이 증진되었다. 물성적인 특성에 있어서는KF와 LBG를 혼합하여 첨가한 처리구를 제외하고 다른 혼합 첨가구는 유화형 대조구와 비교적 유사한 물성적인 성상을 가졌으며 그 중 KF와 CN의 복합처리구가 유화형 대조구와 가장 유사한 물성을 가졌다. 이상의 결과에서 볼 때 기존의 유화형 대조구와 유사한 물성을 갖는 저지방 소시지를 개발하기 위하여 친수성 콜로이드의 단일첨가보다는 보수력이 좋은 KF 혹은 LBG등과 경도를 높여 주는 CN과의 복합지방대체제의 첨가가 더욱 효율적임을 알 수 있었다.

• Journal of Microbiology and Biotechnology
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• 제32권1호
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• pp.81-90
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• 2022

Peucedanum japonicum Thunberg (PJT) has been used in traditional medicine to treat colds, coughs, fevers, and other inflammatory diseases. The goal of this study was to investigate whether 3'-isovaleryl-4'-senecioylkhellactone (IVSK) from PJT has anti-inflammatory effects on lung epithelial cells. The anti-inflammatory effects of IVSK were evaluated using phorbol 12-myristate 13-acetate (PMA)-stimulated A549 cells and regular human lung epithelial cells as a reference. IVSK reduced the secretion of the inflammatory mediators interleukin (IL)-8 and monocyte chemoattractant protein-1 (MCP-1), and the mRNA expression of IL-6, IL-8, MCP-1, and IL-1β. Additionally, it inhibited the phosphorylation of IκB kinase (IKK), p65, Iκ-Bα, and mitogen-activated protein kinases (MAPKs) p38, JNK, and ERK in A549 cells stimulated with PMA. Moreover, the binding affinity of activator protein-1 (AP-1) and nuclear factor-κB (NF-κB) was significantly reduced in the luciferase assay, while nuclear translocation was markedly inhibited by IVSK in the immunocytochemistry. These findings indicate that IVSK can protect against inflammation through the AP-1 and NF-κB pathway and could possibly be used as a lead compound for the treatment of inflammatory lung diseases.

• IMMUNE NETWORK
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• 제11권2호
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• pp.107-113
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• 2011

Background: Metabolic disorders, including type II diabetes and obesity, present major health risks in industrialized countries. AMP-activated protein kinase (AMPK) has become the focus of a great deal of attention as a novel therapeutic target for the treatment of metabolic syndromes. In this study, we evaluated whether dietary aloe could reduce obesity-induced inflammation and adipogenesis. Methods: Male C57BL/6 obese mice fed a high-fat diet for 54 days received a supplement of aloe formula (PAG, ALS, Aloe QDM, and Aloe QDM complex) or pioglitazone (PGZ) and were compared with unsupplemented controls (high-fat diet; HFD) or mice fed a regular diet (RD). RT-PCR and western blot analysis were used to quantify the expression of obesity-induced inflammation. Results: Aloe QDM complex downregulated fat size through suppressed expression of scavenger receptors on adipose tissue macrophages (ATMs) compared with HFD. Both white adipose tissue (WATs) and muscle exhibited increased AMPK activation through aloe supplementation, and in particular, the Aloe QDM complex. Obesity-induced inflammatory cytokines (IL-$1{\beta}$ and -6) and $HIF1{\alpha}$ mRNA and protein were decreased markedly, as was macrophage infiltration by the Aloe QDM complex. Further, the Aloe QDM complex decreased the translocation of NF-${\kappa}B$ p65 from the cytosol in the WAT. Conclusion: Dietary aloe formula reduced obesity-induced inflammatory responses by activation of AMPK in muscle and suppression of proinflammatory cytokines in the WAT. Additionally, the expression of scavenger receptors in the ATM and activation of AMPK in WAT led to reduction in the percent of body fat. Thus, we suggest that the effect of the Aloe QDM complex in the WAT and muscle are related to activation of AMPK and its use as a nutritional intervention against T2D and obesity-related inflammation.