• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.818-819
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• 2007

생산자는 제품의 생산이나 판매에 소요되는 비용보다 낮은 가격으로 제품을 판매하지 않을 것이며, 신규시장의 진입에 따른 불활실성과 기타 영업비용의 지출로 인해 어느 정도 수익이 감소할 경우도 있다. 또한 CRM은 제품의 수익성을 논하는 것이 아니고, 수요자의 필요성을 만족시키기 위해 수요자와 관계를 발전시키고 궁극적으로 이윤을 창출하게 하는 분야이다. 그러므로 Customer Profitability Analysis(CPA)의 궁극적인 목표는 각 개인의 수익성을 평가하기 위하여 개인별 수입과 비용을 추적하는 것이 된다. 전력시장의 경우 경쟁체제로 변하고 있으며 전력사업자는 기존 고객을 어떻게 유지하고 이탈을 방지하느냐가 중요한 이슈로 떠오를 전망이다, 따라서 민간부분 경쟁 강화 등에 대비하여 기존 고객유지를 위한 서비스강화와 고객에게 맞춤형 서비스를 제공하여 수익성을 확보해야 한다. 본 논문은 CPA의 궁극적인 목표를 전력산업에 반영하여 전력사업자의 수익을 위한 전력서비자의 수익 성분석에 대한 방법론을 제시하고자 한다.

• Journal of Information Technology Services
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• v.5 no.1
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• pp.35-46
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• 2006

In recent years, academic scholars and practitioners have given increasing attention to the importance of strategic performance measurement systems including both financial and non-financial performance metrics. The Balanced Scorecard (BSC) is known as integrated performance management framework that helps an enterprise to translate strategic objectives into relevant performance within an organization. While the current literatures and management articles offer BSC design and implementation. there are few reports of detailed validation of using the rationalized sets of CSF (Critical Success Factors) and KPI (Key Performance Indicators) for the Korean construction industry. This paper first propose the perceived sets of CSF/KPI using current literatures and validate with a major construction company's executives and senior managers in Korea. The paper then examines whether the perceived sets of CSF/KPI have co-relationships with the firm performances. The results of the research contribute in heightening of competitiveness of the Korean construction companies in strategic and performance management.

• Applied Chemistry for Engineering
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• v.26 no.4
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• pp.470-476
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• 2015

In this study, three dicaffeoylquinic acids (DCQAs) isolated from Gnaphalium affine D. DON. extracts were structurally identified and evaluated for their antioxidant activities, cellular protective effects, and tyrosinase inhibitory activities. The ethyl acetate fraction of G. affine was chromatographed, which yielded 3 DCQA derivatives of 1-3 : 3,5-dicaffoylquinic acid (3,5-DCQA, 1), 4,5-dicaffeoylquinic acid (4,5-DCQA, 2), 1,5-dicaffoylquinic acid (1,5-DCQA, 3). The structure of each compounds was determined using $^1H$ NMR and MS analyses. Compounds of 1-3 showed strong free radical (1,1-diphenyl-2-picrylhydrazyl, DPPH) scavenging activities ($FSC_{50}=3.70$, 5.80, and $5.50{\mu}M$, respectively) compared to those of a commonly used lipophilic antioxidant, (+)-${\alpha}$-tocopherol ($21.90{\mu}M$). Cellular protective effects of 1-3 compounds on the $^1O_2$ sensitized photohemolysis of human erythrocytes were similar to (+)-${\alpha}$-tocopherol. 1-3 compounds also exhibited higher tyrosinase inhibitory effects ($IC_{50}=0.15$, 0.16, and 0.13 mM) compared to arbutin (0.33 mM), known as a skin-whitening agent. These results indicate that three DCQA derivatives may be applied as an antioxidant and a skin whitening agent in food or cosmetic industries.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.11
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• pp.983-988
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• 2009

This study was performed to evaluate the toxicity and seek the control method of the wastewater in which nickel (Ni) was included into an industrial wastewater treatment plant. Nickel concentration of the wastewater, of which samples were taken every hour during 24hours, were various from 0.33 to 116.0 mg/L, with 24.0 mg/L of the average concentration. IC50 values against nitrosomonas and nitorbactor, a toxic level against bacteria which could inhibit 50% of nitrification bacteria in the wastewater, are 5.5 and 4.9 mg/L respectively. Nickel in this industrial wastewater can inhibit the 50% of nitrification bacteria even after diluting this wastewater 5 times. Also, this research, which reduced the nickel concentraion, forming nickel hydroxide compounds by increasing pH of the wastewater, shows that nickel concentraion can be obtained under 1.7 mg/L at pH 11 and 0.6 mg/L at pH 12. Consequently, the result of this study is that the nitrification efficiencies can be obtained from 83.8 to 99.4% with 97.6% of the average in the biological treatment after removing nickel in the wastewater by increasing the pH above 11~12, which is forming the nickel hydroxide compounds.

• Korean Journal of Food Science and Technology
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• v.43 no.4
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• pp.464-468
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• 2011

Halocynthia roretzi is one of the most important cultured marine species on the southern coast of Korea. Samples were extracted using methanol (ME), ethanol (EE) and water (WE) to evaluate the antioxidant activities and antilipase activity in Halocynthia roretzi extracts. Antioxidant potentials of the samples were determined by poly-phenol content, flavonoid content, free radical scavenging activity, reducing potential, and chelating activity. The ME showed significant scavenging activity (1176 ${\mu}g/mL$ IC50 for DPPH, and 895 ${\mu}g/mL$ IC50 for ABTS assay). The IC50 for lipase inhibition activity was 12,021, 6,004, and 14,979 ${\mu}g/mL$ in the ME, EE, and WE, respectively. In conclusion, Halocynthia roretzi extracts exhibited antioxidant activities and anti-lipase activity. These results suggest that Halocynthia roretzi extracts can be potentially used as a source of antioxidant and antiobesity agents.

• Korean Journal of Materials Research
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• v.3 no.3
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• pp.253-260
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• 1993

High strength and fracture toughness of Al-Li-Cu alloy(2090 Al alloy) have been achieved by the improvement of melting and casting, extrusion and heat treatment techniques. To establish the sucessful process for semi-industrial scale ingot(20Kg) the following areas have been investigated: (1) Improvement of melting and casting techniques for ingot by introducing atmospheric modifications, vacuum and rotary degassing, and deslagging. (2) The effect of heat treatment on mechanical properties (3) Mechanical characterization by tensile test, fracture toughness test and fatigue crack propagation test. High mechanical properties were found to be intimately related with ingot soundness. Tensile strength of final products varied from 534MPa to 566MPa in peak aged condition while elongation/ductility ranged from 9.0% to 11.9%. From the fracture toughness test with using compact tensile specimen, plane strain fracture toughness($K_{Ic}$) appeared to be 39MPa${\surd}$m in peak aged condition and 23MPa${\surd}$ m in underaged condition. When load ratios of 0.1, 0.3 and 0.5 were given ${\Delta}K_{th}$ was 6.0MPa${\surd}$ m, 5.3MPa${\surd}$ m and 4.3MPa${\surd}$ m respectively.

• Korean Journal of Construction Engineering and Management
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• v.16 no.1
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• pp.82-91
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• 2015

Recently, due to the increasing concern of environmental factors and low carbon usage, the use of natural gas has been inclining steadily. In order to meet the growing demand of natural gas, government have established strategies to secure the sufficient amount of gas that is mainly used by industries, power generation and residential use by constructing additional receiving terminals for Liquid Natural Gas (LNG). In the process of selecting the optimal site for the terminals, the characteristics of the terminals are not considered where the decision making is done through internal meetings or outsourcing. In respect to site selection, researches are done to derive the factors that are considered for optimal site selection. However, there have not yet been researches in creating a systematic model for analyzing the optimal site selection. To this aim, the paper aims to propose a model for site selection of LNG receiving terminals that considers the characteristics of the terminal construction. Total of 47 factors considered in site selection is derived through interviews with experts and analyzing the previous cases of site selection by various firms. Furthermore, the derived 47 factors are used for the survey for the previous LNG terminals in PT, IC, TY, SC and BR areas where the survey data is analyzed by factor analysis and multiple regression models to depict the optimal site. By applying the model for site selection, practitioners are able to make decisions for site selection in a systematic approach for new candidates of sites.

• Journal of Food Hygiene and Safety
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• v.28 no.4
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• pp.337-341
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• 2013

After it was known that an antioxidant function was associated with a reducing risk of cancer and cardiovascular disease, a large number of plant have been investigated for their antioxidant activity. However, lacking of the extensive antioxidant data in vegetables, a few natural antioxidant was used in the food industry. Therefore, this study was carried out to provide some scientific antioxidant activity data in the various vegetables. The samples (n = 275) including 24 kinds of vegetables were examined for antioxidant activity. Total Phenol Contents (TPCs) were measured colorimetric determination method using the Folin-Ciocalteu reagent by gallic acid as the control group. DPPH radical scavenging activity were also investigated using calculation of $IC_{50}$(concentration of extracted needed to inhibit 50% of the DPPH radical). The contents of TPCs were $0.32{\sim}49.26{\mu}g/kg$ and DPPH radical scavenging activity ($CI_{50}$) was 0.0~2.43 mg/mL in vegetables. The best antioxidant effect was shown in Garlic for both antioxidant assay methods.

• Journal of Radiation Industry
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• v.3 no.1
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• pp.13-18
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• 2009

In earlier investigations, seeds of Perilla frutescens(L.) Britt. cv. Chookyoupjaso were irradiated with 200 Gy gamma ray to generate mutagenesis. The aim of this study is to investigate the effects of a hexane extract from Perilla frutescens (L.) Britt. cv. Chookyoupjaso mutant 45 on the actions of anti-inflammatory activity on inducible nitric oxide synthase, and an identification of the major active compound. The hexane extract from P. frutescens exhibited activity of inhibition of a NO production ($IC_{50}$, $295.1{\mu}g\;ml^{-1}$). The hexane extract was further divided into subfractions by silica-gel chromatogarphy. Inhibition of the NO production by various fractions was assayed in LPS-stimulated RAW 264.7 cells. Among the seven fractions, the 5th fraction was the most effective ($IC_{50}$, $19.5{\mu}g\;ml^{-1}$). The 5th fraction suppressed the expression of protein of iNOS in LPS-induced RAW 264.7 cells, and GC/MS analyses showed that isoegomaketone is a major bio-active compound in the 5th fraction. The result indicated that isoegomaketone has a good potential to be developed as an anti-inflammation agent.

• Journal of Korea Entertainment Industry Association
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• v.15 no.8
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• pp.363-377
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• 2021

The present study investigated the effects of dynamic tubing gait training(I and II) on the postural alignment, gait, and quality of life in chronic patients with Parkinson's disease. This study is based on the case study that recruited a total of 3 patients with chronic Parkinson's disease (Hoehn and Yahr Stage of 1 to 3 each one person). Dynamic tubing gait training (I and II) applied to chronic patients with Parkinson's disease for 25 sessions, 30 minutes a day, 5 days a week, over 5 weeks period. To investigate the effects of this study, evaluating using the postural alignment test, muscle activity tests, gait analysis, and quality of life scale for patient with Parkinson's disease. After the intervention of Dynamic tubing gait training (I and II), Trunk flexion was decreased. Also, during walking from initial contact (IC) to mid stance (Mst), muscle activity of Quadriceps, Hamstring, and Tibialis Anterior (TA) was increased and muscle activity of Gastrocnemius was decreased. The muscle activation of Erector Spinae (ES T12, L3) was increased in the H&Y I and III stages and decreased in the H&Y II stage. Length of gait line, single support line, ant/post position and lateral symmetry of center of pressure (COP) parameters improved. The spatio-temporal gait parameters including of step length, stride length, and velocity was increased, and cadence decreased. Further the quality of life of patients with Parkinson's disease was improved. Based on these findings, Dynamic tubing gait training (I and II) could be applied as a new approach to improve posture, gait, quality of life in chronic patients with Parkinson's disease for more than 5 years, whose drug resistance is halved.