절연유에서 부분방전에 의한 극초단파 신호 특성분석

朱炯俊(Hyoung-Jun Ju),具嬋根(Sun-Geun Goo),朴基濬(Ki-Jun Park),韓基善(Ki-Seun Han),尹珍烈(Jin-Yul Yoon) 대한전기학회 2008 전기학회논문지 P Vol.57 No.1

We have designed 4 types(void in insulation paper, protrusion electrode, floating electrode, surface discharge) of partial discharge(PD) defect to simulate typical faults found in oil filled power transformers Ultra-high frequency(UHF) radiation due to PD was measured using a UHF measuring system and a conventional PD measuring system, simultaneously. Electromagnetic radiation spectra of these defects show UHF radiation up to about 1.5-2 ㎓ range. The phase resolved partial discharge(PRPD) patterns of UHF radiation from the PD defects were also measured and the pattern reveals distinct feature for each defect types. The UHF measuring could be used to detect PDs in oil filled transformers and analysis of the PRPD pattern should provide useful information on origin of PD signal.

소비자의 성격이 온라인 쇼핑몰에 대한 몰입과 구전의도에 미치는 영향

주형준(Hyoung Jun Ju),서현석(Hyun Suk Suh) 국제e-비즈니스학회 2015 e-비즈니스 연구 Vol.16 No.3

DEA를 이용한 지역SW성장지원사업 수행기관의 효율성 분석 및 개선 방안

주형준(Hyoung Jun Ju),김대철(Dae Cheol Kim) 한국생산관리학회 2014 한국생산관리학회지 Vol.25 No.4

정부는 지역의 SW산업 육성을 통한 지역 경제 활성화 및 창조경제 실현을 위한 핵심 수단으로 1998년부터 SW 수요가 높은 18개 지역을 대상으로 지역SW융합센터를 설치하여 지역SW성장지원사업을 진행해 오고 있다. 이러한 지역SW성장지원사업에 대한 지금까지의 평가는 각 기관 자체의 성과에 대한 계획 대비 실적을 기반으로 하는 정보통신산업진흥원의 정량ㆍ정성적인 평가 방식이 주로 사용되어 왔다. 그러나 이러한 평가 방식만으로는 각 기관에서 설정한 계획 또는 실적이 얼마나 효율적이고 합리적인지 알 수 없다. 따라서 본 연구는 DEA와 Post-DEA 모형을 사용하여 2012년에 수행된 지역SW성장지원사업에 대한 18개 지역SW융합센터의 효율성을 비교 분석해 보고 개선 방안을 제시하는데 그 목적이 있다. 지역SW융합센터의 효율성을 실증 분석하기 위해서 2013년 12월 지역소프트웨어산업발전협의회에서 18개 지역SW융합센터를 대상으로 수집한 2012년 지역SW산업진흥지원사업 자료를 사용하였다. DEA를 통한 효율성 분석을 통해서 비효율적인 기관의 잠재적인 개선 가능치를 도출하였으며, Tier 분석을 통해서 현실적으로 벤치마킹 대상으로 삼을 수 있는 집단을 규명하였다. 또한, Tobit 분석을 실시하여 지역의 총 IT/SW 기업체 수 및 지역SW융합센터 IT/SW 분야 총 담당인력 수가 효율성에 영향을 미치는 요인들임을 밝혔다. In this study, the efficiency of 18 agencies supporting regional software growth are analyzed using DEA and post-DEA. Based on the DEA, using results from the Regional SW Growth Supporting Projects conducted in 2012, directions for improvement are discussed for these 18 agencies. The results show that only 8 agencies(Gangwon, Gyeonggi, Goyang, Anyang, Yongin, Jeonnam, Jeonju, Chungbuk) are efficient. The average efficiency of these 18 agencies are about 78%. Furthermore, the total number of regional IT/SW companies as well as the number of agents of each regional software growth supporting Projects executing agencies affect efficiencies statistically at the 1% significance level.

생산성논집 : 온라인 쇼핑 동기가 실용적 가치, 쾌락적 가치, 재구매의도에 미치는 영향

주형준 ( Hyoung Jun Ju ),조중환 ( Joong Hwan Cho ) 한국생산성학회 2014 生産性論集 Vol.28 No.3

The current study investigates relationships shopping motivation have effects on repurchase intention. This causal relationship is mediated utilitarian value and hedonicvalue. Study samples composed of ages between 20s and 30s who have prior experiences in online shopping purchases. Total of 256 valid data were collected and analyzed. The results indicated cost saving, shopping convenience, and browsing showed significance on both utilitarian value and hedonic value. The variety seeking and self-gratification showed significance on utilitarian value. The social interaction showed significance on hedonic value. The utilitarian value and hedonic value showed significance on repurchase intention, and the intensity was prominent in the relationship between the utilitarian value and repurchase intention. In conclusion, we believe that to improve the degree of repurchase by providing all of the practical value and hedonic value to customers operators of on-line shopping channel. Also diversity motivation, is expected to be able to derive a more efficient repurchase effect by stimulating the buying motives other than self-satisfaction synchronization information seeking motivated, among hedonic value. Additionally, will be able to derivea more efficient effect over the repurchase hedonic value by stimulating information seeking, diversity motivation and self-satisfaction motivation. Therefore contribute to increased productivity of field sales and increased profits due to corporate business strategy speaks of online shopping.

오픈마켓에서의 웹사이트 품질과 관계요인이 관계의 질, 전환장벽 및 재구매의도에 미치는 영향에 관한 연구

서현석(Hyun-Suk Suh),주형준(Hyoung-Jun Ju) 국제e-비즈니스학회 2011 e-비즈니스 연구 Vol.12 No.3

고객화 혜택, 확신적 혜택, 경제적 혜택이 오픈마켓에서의 이탈의도와 충성도 유지에 미치는 영향

서현석(Hyun-Suk Suh),주형준(Hyoung-Jun Ju) 국제e-비즈니스학회 2012 e-비즈니스 연구 Vol.13 No.3

소비자성향과 채널선택행동간의 관계에 관한 탐색적 연구

서현석(Hyun Suk Suh),주형준(Hyoung Jun Ju) 중앙대학교 한국전자무역연구소 2016 전자무역연구 Vol.14 No.2

연구목적: 소비자는 전통적 쇼핑채널뿐만 아니라 인터넷과 모바일을 이용해 다양한 쇼핑채널을 넘나들고 있다. 본 연구는 소비자의 성향에 따른 채널선택 행동을 제품의 탐색과 구매단계를 고려하여 소비자관점의 시각에서 밝혀보고자 한다. 논문구성/논리: 본 연구에서 독립변수인 소비자성향 변수는 우유부단성, 자기효능감, 혁신성 등 3가지 차원으로 구성했고, 종속변수인 채널선택행동은 탐색과 구매단계를 온라인/오프라인으로 유형화해 4가지 형태로 구성했다. 이를 통해 소비자성향과 채널선택행동의 주효과와 이들 사이에서 위험추구 정도에 따른 조절효과를 살펴보았다. 결과: 분석결과 전통적인 순수오프라인형과 다른 채널유형과 비교해 볼 때 우유부단성과 자기효능감이 높을수록 리버스쇼루밍형, 쇼루밍형, 순수온라인형을 선택할 가능성이 높게 나타났고, 혁신성이 높을수록 순수온라인형을 선택할 가능성이 높게 나타났다. 반면 우유부단성이 높고 위험추구 정도가 낮을수록, 자기효능감이 높고 위험추구 정도가 높을수록 순수오프라인형에 비해 리버스쇼루밍형, 쇼루밍형, 순수온라인형을 선택할 가능성이 높았다. 그리고 혁신성이 높고 위험추구 정도가 높을수록 순수오프라인형에 비해 순수온라인형을 선택할 가능성이 높게 나타났다. 독창성/가치: 본 연구는 선행연구에서 사용되지 않았던 소비자의 채널선택행동을 4가지 형태로 유형화 시키고 소비자성향 변수를 접목했다는 점에서 기존의 연구와 차별화된다. 또한 최근 많이 언급되고 있는 리버스쇼루밍이나 쇼루밍현상을 전통적인 채널유형과 비교해보았다는 점에서 의미가 있다. Purpose: Consumers today not only use traditional shopping channels but also other social networking channels, such as Internet and mobile communications. Current study investigates how consumers choose their favorite channels depending on different dispositions they possess. Composition/Logic: Current study sets independent variables as indecisiveness, self-efficacy, and consumer innovation, while their behavior on channel choice as dependent one. The channel choice has been categorized as four types including on and off-line purchase. In between the causal relationship of consumer dispositions and their channel choices, the risk taking behavior was considered as a moderator. Findings: The results indicated that channel retention in off-line showed significance on reverse-showrooming, showrooming, and channel retention in on-line when test subjects are oriented toward indecisiveness and self-efficacy. But when the test subejcts showed high in innovation, they tend to choose channel retention in online. On the other hand, when they showed high in indecisiveness with low risk-taking behavior, and hight self-efficacy with high risk-taking behavior, they tend to choose reverse-showrooming, showrooming, and channel retention in online. When they showed high innovation with high risk-taking behavior, they tend to choose channel retention in online. Originality/Value: The current study suggested four types of consumer’s choice of different channels in which no other previous studies tested. Add to that, reverse-showrooming and showrooming are recent trend, in which our study compared them with the traditioal ones.

오픈마켓에서 관계혜택이 몰입과 이탈의도 및 충성도에 미치는 영향에 관한 연구

서현석(Suh, Hyun Suk),주형준(Ju, Hyoung Jun) 한국서비스경영학회 2012 서비스경영학회지 Vol.13 No.5

The current study looks at how relationship benefits consumers receive in on-line open market purchases, such as social opportunity, personalized service, and time and monetary savings, can influence on customer`s loyalty or the intention to alienate. This causal relationship is mediated by commitment. To explore the idea, we have chosen study participants ages between 20s and 30s who have prior exposures in open market purchases. A valid 302 questionnaire data were collected and used for analyses. The results indicated all relationship benefits showed significance on commitment. The commitment showed significance on loyalty but not on the intention to break away from the purchasing site. The social opportunity and economic benefits showed significance on break away. socialization, On looking at the mediating effect, social opportunity, personalized service influenced loyalty through commitment. In the relationship between commitment and loyalty, we`ve looked at the regulatory focus by comparing two groups; prevention-oriented focus group and promotion-oriented focus group. The former showed stronger tie. Overall, the economic benefits(time and money) was found to be the most significant factor in strengthening long term relationship between consumers and open markets. It was interesting to note consumer`s ambivalent attitude toward relationship in which consumers are ever-ready to break away from their favorite sites, while they have no intention to terminate the relationship with drop once in a while sites.

가스절연모선(GIB)에서 전자파 방전신호의 모드별 군속도 차이를 이용한 방전위치 산정기법

具嬋根(Sun-geun Goo),朱炯俊(Hyoung Jun Ju),朴基濬(Kijun Park),韓基善(Ki-Seon Han),尹珍烈(Jin-yul Yoon) 대한전기학회 2007 전기학회논문지 Vol.56 No.12

We developed a novel method of partial discharge(PD) location based on the fact that the waveform of PD signal propagate along the GIB(Gas Insulated Bus) is composed of several modes of electromagnetic wave with different group velocities and cut-off frequencies. From the PD waveform, measured at a broadband PD sensor attached on the GIB, we could derive arrival time and frequency components of different modes using the short term Fourier transform or etc. After the group velocities of different modes are calculated, the location of the PD source could be estimated. To show the effectiveness of this new locating method in a real on site application, we used this method to locate the position of a PD source at a 76 m long 345 ㎸ GIB substation. The estimated location of the PD source using the method proposed above was in good agreement with the actual location found from the inspection result of internal component in the GIB with 2.4 % of the estimation error.

TDR을 이용한 극초단파 대역에서 사용 절연유의 유전율과 전파속도 측정

具嬋根(Sun-Geun Goo),朱炯俊(Hyoung Jun Ju),朴基濬(Kijun Park),韓基善(Ki-Seon Han),尹珍烈(Jin-Yul Yoon) 대한전기학회 2008 전기학회논문지 Vol.57 No.11

We measured the permittivity and electromagnetic wave propagation velocity of used insulation oil with wide frequency range including ultra-high frequency by time domain reflectometry. The permittivity or propagation velocity is essential for locating discharge faults of oil filled power transformer. We derived 2.21 as a permittivity and 2.03 × 10? ㎧ as a velocity from the measurement of pulse travelling time along a coaxial line filled with used insulation oil or air. The permittivity measurement system we designed shows high measurement accuracy and the convenience for field use.