• Journal of the Korea Convergence Society
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• v.11 no.4
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• pp.343-350
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• 2020

This study was intended to use the Inertia Sensor Units(IMU) for the national women's handball team to quantify movements for a total of 16 domestic or international practice games over five months and to identify the efficiency of training and differences in movements by position. A total of 15 players were participated excluding goalkeepers. The results are as follows. Player Load came in order of Wing>Back>Pivot and high in international games. Change of Direction(CoD) were found to have the most Pivot at low intensity, while middle and high intensity were the most in the Back. There have been a lot of low and middle intensity CoD in International games. Low-intensity acceleration(ACC) and deceleration(DEC) were found to have the most Pivot, while middle & high intensity ACC and DEC had the most Back. There have been many low and middle intensity ACC and low, middle and high intensity DEC in international games. There were many middle and high intensity jumps in Back and Wing, but there were no differences in the types of games.

• Korean Chemical Engineering Research
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• v.61 no.3
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• pp.446-455
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• 2023

A mathematical model for predicting the liquid circulation velocity in an airlift reactor was developed based on the mechanical energy balance of the fluid circulation loop. The model considered the energy loss due to a 90° turn, the energy loss due to friction, and the energy loss due to the change in cross-sectional area at each part of the reactor. The model that separately considered the loss coefficients related to friction, direction change, and cross-sectional area change was able to predict the liquid circulation velocity better than the previous model using lumped parameters. The liquid circulation velocity was measured by the tracer pulse method. Most of our experimental results obtained in external-loop airlift reactors, which had the top and bottom connecting pipes, as well as other investigators' results obtained in various types of airlift reactors, were well predicted by the developed model with an error within 20%. Useful empirical equations for the loss coefficient related to the 90° turn of the circulating fluid were obtained in external and internal-loop airlift reactors and used to predict the liquid circulation velocity.

• JOURNAL OF ELECTRICAL WORLD
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• s.456
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• pp.47-49
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• 2014

현재 전력산업의 패러다임은 늘어나는 전력수요를 발전소 등 전력설비를 증설해 대응하는 것에서 벗어나, 전력수요를 적절히 관리해 수요 증가세를 억제함으로써 전력수급의 안정화를 이루겠다는 방향으로 전환됐다. 이에 지난달 25일 개설된 수요자원 거래시장은 매우 특별한 의미를 갖는다. 발전자원만을 유일한 공급원으로 거래하던 현행 전력시장에서, 발전자원과 수요자원을 통합해 거래하는 시장으로 전환됨을 뜻하기 때문이다. 수요자원 거래시장에 대해 자세히 알아본다.

• The Journal of the Korea Contents Association
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• v.9 no.1
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• pp.293-303
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• 2009

The purpose of this study is to review causal effect of corporate image, customer royalty on switching cost. Specifically, giving managerial view point to build strategic CRM is major purpose of this research with finding out how the switching cost influences to the corporate image and customer loyalty deciding customer's desire of repurchase and knowing the important factors of corporate image. The result of this study is that switching cost has an effect on corporate image as the important factors. Also corporate image influences on customer loyalty.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.237-240
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• 2001

비디오 데이터의 효율적인 저장, 관리를 위해서는 장면전환 검출을 통한 비디오 분할 기술에 대한 연구가 필요하다. 기존의 장면전환 검출 알고리즘은 복호화에 의한 연산량 및 프레임들간의 비교에 의한 연산량이 많고 잡음에 의한 오검출 및 미검출이 발생하게 된다. 본 논문에서는 MPEG 압축 비디오에서 압축 영역에서의 타른 장면전환 검출을 위한 최적의 검색 간격을 유도하였고, 검색간격 내의 B 프레임의 방향성을 직접 추출하여 장면전환검출에 이용하므로 빠르고 정확한 장면전환 검출 알고리즘을 제안한다.

• Journal of Korea Fair Competition Federation
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• no.85
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• pp.14-23
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• 2002

독과점적인 시장구조를 경쟁적인 구조로 전환시키기 위한 방안으로 검토될 수 있는 대안은 여러 가지가 있을 수 있는데, 첫째로 현재 신규진입장벽으로 작용하고 있는 신용카드업 허가기준을 완화하는 방향으로 신용카드회사 수를 늘리거나, 허가제를 신고제로 전환하는 등의 검토가 필요할 것이고, 둘째로 경쟁을 통한 고율의 수수료 인하를 유도하며, 셋째로 신용카드 회사간의 자유로운 경쟁을 도모하고 소비자를 보호하기 위해서는 시장구조를 경쟁적인 구조로 전환시키는 노력과 함께 당해 시장에서 공정한 경쟁이 이루어지도록 시장감시활동을 강화하는 노력이 병행되어야 할 것이다.

• Journal of Life Science
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• v.20 no.2
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• pp.292-297
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• 2010

Anthocyanin, a phenolic compound, is a pigment that shows blue or red color in the fruit, petal and other tissues. It is an important factor in grape berry skin pigment and accumulates only in the skin. This skin-specific accumulation of anthocyanin has been reported to be regulated by the ufgt gene which encodes UDP-glucose: flavonoid 3-O-glucosyltransferase that participates in the biosynthesis of anthocyanin. The ufgt gene is expressed only in berry skin, while the other genes involved in the biosynthetic pathway are expressed in both skin and flesh tissues. In order to determine whether anthocyanin accumulation is primarily regulated by compartment of UFGT, a ufgt cDNA clone was isolated from grape berry, its open reading frame was ligated in pBI121 vector in either a sense or an antisense orientation under the control of the CaMV35S promoter and the recombinant constructs were incorporated into tobacco plants. Several transgenic lines were selected and characterized to determine the level of expression of the grapevine ufgt transcript and endogenous homologs of tobacco. Compared to the wild-type, the amount of anthocyanins in sense transgenic plants increased by 44%, while the amount of anthocyanins in antisense transgenic plants decreased by 88%. In addition, the color of flowers became intense in the sense transgenic plants. These results suggest that over-expression or repression of the ufgt gene affected the accumulation of anthocyanin in flowers of tobacco.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.83-86
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• 2007

가시광에서 활성을 보이는 $TiO_2$광촉매를 이용하여 대표적인 방향족 VOCs인 BTEX의 분해효과에 대한 실험을 실시하였다. 실험 결과 Xylene은 높은 전환율을 나타낸 반면, Benzene은 가장 낮은 전환율을 나타냈다. 이는 Benzene이 다른 물질에 비해 상대적으로 안정적인 분자 구조에 의해서 반응성이 매우 약하기 때문인 것으로 사료된다. 본 실험은 여러 가지 조건들 중에 농도와 유량만 변화 시킨 가운데 얻어진 결과이기 때문에 향후 연구에서 습도, 농도, 유량 및 빛의 강도 등 다양한 조건의 변화에 따라 최적의 조건을 찾아낼 수 있을 것으로 판단된다. S 가 도핑된 $TiO_2$ 광촉매는 가시광 하에서 방향족 VOCs를 제어하는 광촉매 기술 중에 비교적 최신의 기술이며, 향후의 연구 개발이 더욱 필요하다.

• Proceeding of EDISON Challenge
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• 2016.11a
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• pp.44-48
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• 2016

물 속에서 고속으로 유영하는 상당수의 어류는 긴 부리 모양의 주둥이를 가진다. 대표적으로 지구상 가장 빠른 물고기인 돛새치가 있다. 이러한 사실은 이 독특한 형상과 고속운동의 상관관계에 대해 학구적 호기심을 자아냈고 그에 따라 본 연구를 수행하였다. 본 연구에서는 돛새치, 청새치들의 2차원 형상을 가지고 부리의 존재 유무가 항력에 미치는 영향을 분석하고 더 나아가 미사일의 spike가 항력에 미치는 영향을 분석하였다. 또한 부리가 방향전환 시 기동성 증진에도 기여하는지를 알아보았다. 해석을 위해 Kflow Edison_13와 2D_Comp_P 해석자를 활용하여 동일 유동조건에서 항력계수를 비교하였다. 그리고 돛새치가 방향 전환할 때 발생하는 모멘트계수를 얻기 위해 2D_Incomp_P 해석자를 활용하였다.

• Applied Chemistry for Engineering
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• v.9 no.5
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• pp.624-628
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• 1998

The aromatic organic solvents(BTX) were decomposed in the fixed bed reactor packed with a 0.5% $Pt/{\gamma}-Al_2O_3$ catalyst, then, supercritical carbon dioxide(SC-$CO_2$) was used as the reaction media. And the conversion was dependent on the inlet concentration of BTX and the molar density of SC-$CO_2$. The conversion of BTX was decreased with increasing of inlet concentration, and was increased with temperature and pressure. The maximum conversion of benzene was 98.5% at $300^{\circ}C$ and 204.1 atm, and that of toluene and xylene were 82.0 and 76.5%, respectively, at $350^{\circ}C$ and 204.1 atm. The intermediate products of partial oxidation were identified as benzaldehyde, phenol, benzenemethanol, and so on. The BTX can be effectively converted into harmless $CO_2$ and $H_2O$ at appropriate operating condition. Thus, the nontoxic recovery process was suggested as the removal method of BTX.