• Journal of Digital Convergence
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• v.18 no.2
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• pp.163-174
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• 2020

The market for electric vehicles is growing due to the public's interest in the environment and the expansion of electric vehicle support projects in terms of government policy. This study surveyed 2,332 people in Jeju, one of the nation's representative areas of electric vehicles, and the higher the perceived value in terms of the total cost of automobile ownership for electric vehicles, the higher the intention to purchase electric vehicles. The higher the level of knowledge and attachment, the higher the intention to purchase electric vehicles. While many previous studies considered economic value mainly as price, the study was conducted to approach economic value in terms of total cost of ownership. Marketing practitioners also look for practical contributions in that they can propose price framing so that customers can judge the economic value of the electric vehicle as a strategic way to increase the intention to purchase the electric vehicle, rather than just the purchase price. can see. In addition, the same research should be conducted in various regions besides Jeju, so that the research results can be generalized.

• The KIPS Transactions:PartB
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• v.15B no.2
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• pp.171-178
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• 2008

Foreign word transliterations are not consistently used in documents, which hinders retrieving some important relevant documents in exact term matching information retrieval systems. In this paper, a meta search method is proposed, which expands and refines relevant variant queries from an original input foreign word transliteration query to retrieve the more relevant documents. The method firstly expands a transliteration query to the variants using a statistical method. Secondly the method selects the valid variants: it queries each variant to the retrieval systems beforehand and checks the validity of each variant by counting the number of appearance of the variant in the retrieved document and calculating the similarity of the context of the variant. Experiment result showed that querying with the variants produced at the first step, which is a base method of the test, performed 38% in average F measure, and querying with the refined variants at the second step, which is a proposed method, significantly improved the performance to 81% in average F measure.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.4A
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• pp.465-474
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• 2008

Generally design of frame structures composed of beam-column member is accomplished by stability evaluation of each member considering the effective buckling length. This study selects a member of the smallest non-dimension slenderness ratio using the buckling eigenvalue calculated by the elastic buckling eigen-value analysis and axial force of the each member, and decides the initial deflection quantity reflected geometric and material nonlinearities from a suggested equation on the base of standard strength curve of Korea Bridge Design Code. Second-order elastic analysis applying the initial deflection is executed and the stability of each member is evaluated and decides ultimate strength. Through examples of eight-stories and four-stories plane frame structures, the evaluation of the stability is compared with the existing method and ultimate strength of the suggested method is compared with ultimate strength by the nonlinear inelastic analysis. Through these procedures, the increasing of effective buckling length by elastic buckling eigenvalue analysis is prevented from a new design method that considers initial imperfections. And the validity of this method is proved.

• The Journal of the Acoustical Society of Korea
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• v.28 no.5
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• pp.416-423
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• 2009

The ultrasonic pressure fields for the 3 MHz linear phased array transducer with sixteen piezoelectric elements of which one may not be operated by defect were simulated theoretically and measured experimentally using a visualization system of the Schlieren method. The simulation results for steering angles of $0^{\circ}$ and $30^{\circ}$ show that the side-lobe patterns of the transducer including a defective element is quite different from the transducer with all normal elements, and those patterns are in good agreement with the results of visualization. It is shown that the defective elements in a linear array transducer can be detected by comparison of the simulated and the visualized side-lobe patterns in two dimensional acoustic fields.

• Proceedings of the Korean Association for Survey Research Conference
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• 2005.12a
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• pp.91-113
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• 2005

본 연구는 청년들의 취업 및 실업 경험이 정신건강에 어떠한 영향을 미치는지 종단적으로 알아보는 데 목적이 있다. 구체적으로 대학을 졸업하고 난 이후에 지속적으로 미취업 상태로 남아있는 사람들의 정신건강의 문제 그리고 취업에 성공하는 경험이 정신건강에 미치는 영향을 미치는지 알아보고자 한다. 이를 위해서 국내 대학교 4학년생들을 대상으로 1차 조사를 실시하고 이후 약 6개월 간격으로 2차 조사, 3차 및 4차 조사를 실시하였다. 네 시점에서 모두 응답자들의 취업여부와 정신건강 수준을 측정하였다. 4차 조사까지 모두 응답한 560명 중에서 2차, 3차, 및 4차 시점의 취업여부에 의해서 집단을 다음과 같이 나누었다: 2차, 3차 및 4차 시점 순서대로, 모두 취업 상태인 집단('취업-취업-취업 집단'), 3차 시점에서 취업에 성공한 집단('미취업-취업-취업 집단'), 4차 집단에서 취업에 성공한 집단('미취업-미취업-취업집단') 그리고 모두 미취업 상태인 집단('미취업-미취업-미취업 집단'). 그 결과를 보면, 취업-취업-취업 집단의 경우에는 취업에 성공한 2차 시점에서 정신건강 수준이 상당히 좋아졌다가 3차 및 4차 시점에서 다시 본래 수준으로 돌아가는 경향을 보였다. 미취업-취업-취업 집단의 경우에는 취업에 성공한 3차 시점 이후로, 미취업-미취업-취업 집단의 경우에는 취업에 성공한 4차 시점에서 정신건강 수준이 좋아지는 경향을 보였다. 지속적으로 미취업 상태였던 집단에서는 3차 시점에서 정신건강 수준이 상당히 나빠졌다가 여전히 미취업 상태인 4차 시점에서 오히려 완화되는 경향을 보였다. 본 연구의 시사점과 제한점 및 장래 연구의 과제가 논의되었다.iments and numerical analysis of luminescence efficiency in the hole carrier transport layer's thicknes. 나아갈 것이며, 아울러 향후에도 아직 미흡한 분야인 IT 아웃소싱에서 적정수준의 대가지급 방안 및 바람직한 Relationship 에 영향을 미치는 여러 가지 요인에 대해서도 살펴 봄으로써 IT분야의 Outsourcing을 검토하거나, 추진할 때 도움이 될 수 있도록 하고자 한다.개의 총 297개의 데이터를 추출하여 사용하였다. 실험과는 좌측공격 91.7%, 우측공격 100%, 중앙공격 87.5%, 코너킥 97.4%, 프리킥 75%로서 매우 양호한 인식율을 보였다. 사용경험정도가 가입직후 해지에만 영향을 미치는 요인임을 보여준다. 또한 매체의 정보전달 풍부성 (media richness)이 상대적으로 높은 소매점이나 웹사이트를 통해 서비스에 가입한 소비자일수록 가입 직후뿐만 아니라 서비스사용 이후에도 낮은 해지성향을 나타냈다. 이러한 분석결과를 바탕으로 인터넷전화 서비스에 적합한 고객지원 프로그램 설계와 마케팅 매체선정과 관련한 전략적 시사점을 도출한다. 그리고 국내에서 최근 이슈가 되고 있는 차세대 무선인터넷 서비스인 와이브로 출시에 따른 마케팅 및 고객관리와 관련된 시사점을 논의한다.는 교합면에서 2, 3, 4군이 1군에 비해 변연적합도가 높았으며 (p < 0.05), 인접면과 치은면에서는 군간 유의차를 보이지 않았다 이번 연구를 통하여 복합레진을 간헐적 광중합시킴으로써 변연적합도가 향상될 수 있음을 알 수 있었다.시장에 비해 주가가 비교적 안정적인 수준을 유지해 왔다고 볼

• Geophysics and Geophysical Exploration
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• v.13 no.3
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• pp.243-248
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• 2010

Two suspicious events, which were claimed as underground nuclear tests by North Korea, were detected in the northern Korean Peninsula on October 9, 2006 and May 25, 2009. The KIGAM and Korea-China Joint seismic stations are distributed uniformly along the boundaries between North Korea and adjacent countries. In this study, the data from broadband stations with the distance of 200 to 550 km from the test site are used to analyze and compare two nuclear tests of North Korea. By comparing the time differences of the Pn-wave arrival times of 1st and 2nd tests at multiple stations, the relative locations of two test sites could be calculated precisely. From the geometrical calculation with the velocity of Pn wave $V_{Pn}$ = 8 km/s, the 2nd test site is estimated to move in the WNW direction from 1st one with the distance of 2 km. Body wave magnitude, mb of the 2nd test, which was announced officially as the network average of 4.5, varies widely with the directional location of stations from 4.1 to 5.2. The magnitude obtained from Lg wave, $m_b$(Lg), shows less variation between 4.3 to 4.7 with the average of 4.6. The moving-window spectra of time traces of 1st and 2nd tests show very similar pattern with different scale level. In addition, the corner frequencies of P wave of 1st and 2nd tests at each station show no or negligible difference. This indicates the burial depths of two tests might be very similar. The relative yield amount of the 2nd test is estimated 8 times larger than that of the 1st from the weighted average of ground-velocity amplitude ratios.

• The Bulletin of The Korean Astronomical Society
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• v.30 no.2
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• pp.61.2-61.2
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• 2005

• The Journal of the Korea Contents Association
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• v.19 no.1
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• pp.205-222
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• 2019

In this study, we explored the relationship between experienced discrimination and volunteering activities among the $2^{nd}$ baby boom generation. Specifically, applying structural equation modeling, we examined how the effect of experienced discrimination on volunteering among the $2^{nd}$ baby boom generation is mediated by the negative perception of equal opportunity and achievement by personal merit. Data were obtained from the 2016 National Survey on Unequal Opportunity from the Circle Foundation. The research sample was comprised of 474 baby boomers ages 42 to 48 at the time of survey. Results indicated that perceived discrimination affects the level of volunteering among the $2^{nd}$ baby boom generation, through the negative perception of equal opportunity and achievement by personal merit. Based on the findings, we presented policy implications that could promote volunteering activities among the $2^{nd}$ baby boom generation.

• Journal of Korean Society of Transportation
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• v.20 no.5
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• pp.23-31
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• 2002

The headway of vehicles entering an intersection is closely related with the saturation flow rate and is a basic parameter required for determining the saturation headway and the start-up lost delay. Since such headway value reflects the drivers' behaviors and features of the intersection, all intersections don't have an equal value, but are affected by number and location of their lanes, changing types, local characteristics and time zone. Accordingly, this study attempted to suggest proper values on the basis of data by investigating headway in lanes. Number of exclusive through lanes was divided into single lane, double lanes and triple lanes, the locations of lanes were divided into inside lane, central lane and outside lane. As a result of investigating the headway, single through lane, double through lanes-inside lane, and triple through lane-outside lane showed as 1.73 sec., 1.71 sec. and 1.93sec., respectively. The result of calculating the area factor of business areas by fixing 1.00 for the residental area and applying relation between headway and saturation flow rate was 0.96. In the case of start-up lost delay lead dual left turn and directional separation were 1.41 sec. and 3.27 sec., respectively, showing the great difference. Therefore, different start-up lost delay according to changing type should be applied.

• Industry Promotion Research
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• v.8 no.2
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• pp.1-9
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• 2023

To bridge the research gap in the area of the Fourth Industrial Revolution, we explore the correlation between the core technologies of the Fourth Industrial Revolution and the economic performance of companies. The results show that the technologies have a statistically significant positive (+) correlation with company sales. The size of the correlation is highest for 3D printing (139%), followed by big data (129%), cloud computing (127%), artificial intelligence (78%), and the internet of things (70%). We also found a statistically significant negative (-) interaction effect between the internet of things and 3D printing, cloud computing and big data, and cloud computing and 3D printing when examining the interaction effect of introducing core technologies of the Fourth Industrial Revolution on company sales. This paper represents an early attempt to examine the correlation between the core technologies of the Fourth Industrial Revolution and the economic performance of companies and may serve as a basis for further empirical research.