• 무역학회지
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• 제47권6호
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• pp.21-37
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• 2022

This study sought to look at why Facebook and Twitter, which have dominated the social media market, are moving away from other services. To this end, we sought to identify the causes of churn in terms of firm-level strategic direction and resource allocation, which have not been actively presented to the studies. For this purpose, this study divides the social media firm's strategies into horizontal expansion strategy and vertical integration strategy based on the existing reports and researches, and how each of the representative firms' strategies affects users' switching behavior. As a result, there was a significant difference in the strategic direction of the social media firm, when a horizontal expansion strategy is taken, user's switching intention is higher than when a vertical integration strategy is taken. In addition, the switching intention according to the level of dependence showed that the lower the dependence on social media, the higher the intention to switch to other media. The findings are expected to provide highly realistic and concrete strategic alternatives for a variety of economic actors, such as individuals and companies who want to do business using social media.

• 한국콘텐츠학회논문지
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• 제18권9호
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• pp.594-605
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• 2018

본 연구는 실용음악전공 대학생의 긍정심리자본, 감성지능, 문화성향이 갈등관리방식에 어떠한 영향을 미치는가를 밝혀내는데 목적을 두고 있다. 실용음악전공 대학생 283명을 대상으로 설문조사가 이루어졌으며 상관관계분석과 다변인 회귀분석으로 연구문제를 검증하였다. 분석결과를 요약해 보면 다음과 같다. 첫째, 긍정심리자본이 많은 대학생일수록 갈등상황에서 통합방식과 타협방식을 구사하는 것으로 나타났다. 특히 자기효능감은 통합방식과 타협방식, 낙관성은 회피방식과 복종방식, 희망은 지배방식에 가장 큰 영향력을 미치는 것으로 밝혀졌다. 둘째, 감성지능이 높은 대학생일수록 갈등상황에서 통합방식, 타협방식을 구사하는 반면 회피방식과 복종방식은 적게 사용하는 것으로 나타났다. 특히 타인 감성이해는 통합방식, 복종방식, 타협방식, 자기감성이해는 회피방식, 감성조절은 지배방식에 가장 큰 영향을 미치는 것으로 밝혀졌다. 셋째, 수평적/수직적 집단주의와 수평적 개인주의 성향을 가진 대학생일수록 갈등상황에서 통합과 타협방식을 많이 사용하는 것으로 나타났다. 특히 수평적 개인주의 문화성향은 통합방식과 타협방식, 수평적 집단주의 문화성향은 복종방식, 수직적 개인주의 문화성향은 지배방식, 수직적 집단주의 문화성향은 회피방식에 가장 큰 영향력을 발휘하는 것으로 밝혀졌다.

• 대한감각통합치료학회지
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• 제21권2호
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• pp.12-23
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• 2023

목적 : 감각통합치료와 가정프로그램의 중재병행이 다운증후군 아동의 시각적 주의력에 미치는 효과를 알아보고자 하였다. 연구방법 : 본 연구는 다운증후군 아동 1명의 대상으로 개별실험연구를 진행하였으며, 감각통합치료 중재는 주 1회씩 16주간, 가정프로그램은 주 4회씩 16주간 시행하였다. 대상 아동에게 중재 후 시각적 주의력의 변화를 측정하였다. 결과 : 중재 후 물체 주시, 물체 수평적 추시, 물체 수직적 추시 시간은 기초선 기간에 비해 평균값이 상승하였다. 중재 기간에 관찰된 물체 주시, 물체 수평적 추시, 물체 수직적 추시가 기초선 기간의 ±2 표준편차보다 높게 나타났다. 결론 : 본 연구를 통해 감각통합치료와 가정프로그램의 중재병행이 다운증후군 아동에게 시각적 주의력과 시지각 향상된 것을 확인하였으며, 효과적인 중재 방법을 제시하였다는 점에 의의가 있다.

• 보건행정학회지
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• 제16권4호
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• pp.68-85
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• 2006

With the competitive environment accelerating in healthcare industry, the hospital network system is considered as one of the strategies for clinical and managerial efficiency. This study was intended to offer a theoretical view on the hospital network system and to analyze the current network status of hospitals in Korea. Specifically, network types were classified based on the criteria modified from previous studies, and were used to describe and compare the scope and intensity of associated activities. The questionnaire survey was conducted with 237 hospitals during the period of December 27 2005 to January 25 2006. Above 90% of tertiary and secondary care hospitals were under the network system, while only 20% of primary care clinics were affiliated. In general, the scope and intensity of network activities was limited. Vertical and/or clinical integration was more common than horizontal and/or managerial integration. Three most frequent types of hospital network systems were clinical-vertical integration (Type A), clinical/managerial-vertical integration(Type B), and clinical/managerial-horizontal /vertical integration (Type C). Such network types differentiated significantly different features of affiliated hospitals and network systems. The affiliation duration to the network system was the only significant factor influencing on the network type. The strategic approach to the network system was emphasized for hospitals to increase the potential advantage of hospital network systems.

• Journal of applied mathematics & informatics
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• 제20권1_2호
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• pp.391-399
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• 2006

In order to solve the optimization problem of designing the trajectory of three-dimensional horizontal well, we establish a multi-phase, nonlinear, stochastic dynamic system of the trajectory of horizontal well. We take the precision of hitting target and the total length of the trajectory as the performance index. By the integration of the state equation, this model can be transformed into a nonlinear stochastic programming. We discuss here the necessary conditions under which a local solution exists and depends in a continuous way on the parameter (perturbation). According to the properties we propose a revised Hooke-Jeeves algorithm and work out corresponding software to calculate the local solution of the nonlinear stochastic programming and the expectancy of the performance index. The numerical results illustrate the validity of the proposed model and algorithm.

• Journal of Positioning, Navigation, and Timing
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• 제8권2호
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• pp.87-94
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• 2019

The Global Navigation Satellite System (GNSS) Real-Time Kinematic (RTK) positioning has been widely used in geodesy, surveying, and navigation fields. RTK can benefit enormously from the integration of multi-GNSS. In this study, we develop a GPS/BeiDou Navigation Satellite System (BDS) RTK integration algorithm for long baselines ranging from 128 km to 335 km in South Korea. The positioning performance with GPS/BDS RTK, GPS-only RTK, and BDS-only RTK is compared in terms of the positioning accuracy. An improvement of positioning accuracy over long baselines can be found with GPS/BDS RTK compared with that of GPS-only RTK and that of BDS-only RTK. The positioning accuracy of GPS/BDS RTK is better than 2 cm in the horizontal direction and better than 5 cm in the vertical direction. A lower Relative Dilution of Precision (RDOP) value with GPS/BDS integration can obtain a better positional precision for long baseline RTK positioning.

• Structural Monitoring and Maintenance
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• 제5권1호
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• pp.111-127
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• 2018

Horizontal displacement of high-rise building is an essential index for assessing the structural performance and safety. In this paper, a novel inclinometer-based method is proposed to address this issue and an algorithm based on three spline interpolation principle is presented to estimate the horizontal displacement of high-rise buildings. In this method, the whole structure is divided into different elements by different measured points. The story drift angle curve of each element is modeled as a three spline curve. The horizontal displacement can be estimated after integration of the story drift angle curve. A numerical example is designed to verify the proposed method and the result shows this method can effectively estimate the horizontal displacement with high accuracy. After that, this method is applied to a practical slender structure - Shanghai Tower. Nature frequencies identification and deformation monitoring are conducted from the signal of inclinometers. It is concluded that inclinometer-based technology can not only be used for spectrum analysis and modal identification, but also for monitoring deformation of the whole structure. This inclinometer-based technology provides a novel method for future structural health monitoring.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2001년도 e-Biz World Conference
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• pp.11-30
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• 2001

Session Agenda ㆍ E-Business Economy - B2B · What is C-Commerce？ - Marketplace or Businessplace？ ㆍ C-Commerce Business Models - Horizontal, Industry, Private ㆍ C-Commerce via Exchange Solution Models - Marketplace Exchange - Supply Chain Exchange - Product Development Exchange ㆍ Integration is key... NOT Functionality(omitted)

• Korean Journal of Geomatics
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• 제2권2호
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• pp.99-105
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• 2002

The accuracy of the Digital Photologging System, designed for the construction of the road Facility Database, highly depends on the positions and attitudes of the cameras from GPS/INS integration. In this paper, the development of a loosely coupled GPS/INS is presented. The performance of the system is verified through a simulation as well as a real test data processing. Since the IMU used in this study shows large systematic errors, the possible accuracy of the positions and attitudes of this low-performance IMU when combined with precise GPS positions are assigned. Currently, the integrated system shows the positional accuracy better than 5cm in real data processing. Although the accuracy of attitude based on real test could not be assigned at this time, it is expected that better than 0.5 degrees and 1.8 degrees for horizontal and down component are achievable according to the simulation result.

• 전자공학회논문지A
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• 제29A권4호
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• pp.38-48
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• 1992

OEIC(Optoelectronic Integrated Circuit)'s can be integrated horizontally or vertically. Horizontal integration approach is, however, more immune to parasitic and more universally applicable. In this paper, a structural modeling, fabrication and characterization of PIN photodiodes which can be used in the horizontal integration are performed. For device modeling, we build a transmission line model from 2-D device simulation, from which lumped model parameters are extracted. The speed limits of the PIN photodiodes can also be calculated under various structural conditions from the model. Thus optimum design of horizontally integrated PIN photodiodes for high speed operation are possible. Such InGaAs/InP PIN photodiodes for long-wavelength communications are fabricated using pit etch, epi growth, planarization, diffusion and metallization processes. Planarization process using both RIE and wet etching and diffusion process using evaporated Zn$_{3}P_{2}$ film are developed. Characterization of the fabricated devices is performed through C-V and I-V measurements. At a reserve bias of 10V, the dark current is less than 5nA and capacitance is about 0.4pF. The calculated bandwidth using the measured series resistance and capacitance is about 4.23GHz.