• Journal of Information Technology Applications and Management
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• v.20 no.2
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• pp.39-56
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• 2013

There have been many studies that open innovation activities have positive effects on firm performance. However, the previous studies have shown conflicting results, depending on the characteristics of companies or the timing of the product launch. This study empirically compares open innovation performance of first-mover companies and follower companies. The analyses are performed on the samples of the Korean Innovation Survey 2010 companies that explored external information and performed R&D cooperation. The results indicate that open innovation activities can have different effects depending on a company's status in the market. For the first-mover companies, the intensity of utilizing external information has greater impact on the firm's performance than the diversity of it. By contrast, for the follower companies, the diversity of utilizing external information has greater impact on the firm's performance than the intensity of it. In terms of R&D cooperation, the external cooperation is found not to have significant effects on a first-mover company's performance. However, external R&D cooperation of a follower company is showing positive impact on the firm's performance. The implication of the study is to analyze the firm's Open-Innovation performance by comparing first-mover companies with follower companies. Therefore, companies need to execute the Open-Innovation strategy by considering firm characteristics or the timing of the product launch.

• Asian Journal of Business Environment
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• v.1 no.1
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• pp.21-25
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• 2011

Sub-region cooperation is necessary based on the condition that China-Japan-Korea free trade area has not been established. Shandong has common interests with Koreain economic and trade cooperation and it has been equipped with prominent external environment and industrial advantages in sub-region cooperation. The article discusses the advantages, the specific patterns, the cooperation contents and the matched government measures of sub-region cooperation between Shandong and Korea, with the purpose of modifying the relevant policies launched by government.

• Journal of dental hygiene science
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• v.16 no.1
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• pp.84-92
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• 2016

Cooperation of the patients in orthodontic treatment is an essential element. This study examines the internal and external restriction factors and level of cooperation for orthodontic treatment of adolescent orthodontic treatment patients, and the factors that impart influence on the level of cooperation for orthodontic treatment. 'Form for students' among the indices of internal and external restrictions for orthodontics, which is an adaption of 'Orthodontic Locus of Control Scale' was used as survey tool, and 'Reliability and Stability of the Orthodontic Patient Cooperation Scale' was used as survey tool for the level of cooperation of orthodontic patients. As the result of examination of the effect of internal and external restriction factors on level of cooperation for orthodontic treatment by compensating the general characteristics in the multiple regression analysis, it was found that the level of cooperation for orthodontic treatment is higher for the patients who believe there is strong influence of external restrictions-patents-on the events that determines orthodontic treatment. In order to enhance the level of cooperation for orthodontic treatment of adolescent orthodontic patients, there is a need to assess the relationship between the patient and parents as well as the attitude or psychological state of the patients on orthodontic treatment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.5
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• pp.1983-1989
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• 2012

This paper presents the stability analysis of UH-60 helicopter with external store such like chaff/flare dispenser. An external store can affect the natural frequency of the aircraft and induce the resonance, which cause the failure of structures. In this paper, therefore, Rayleigh method is used to investigate the resonance with aircraft and external store, and transmission formula is used to determine the vibration load. Structural analysis with local modeling method are performed to present the robust design of aircraft with external store. The ground and flight test are also done to verify the stability of the aircraft.

• International Commerce and Information Review
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• v.16 no.5
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• pp.203-221
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• 2014

This study examines the effect of external environments such as technological change and competitive intensity on HQ-subsidiary cooperation. It was empirically tested by a Korean sample to verify the validity of the research framework. The empirical result confirms that external environments increase the odds of HQ-subsidiary cooperation. The result also indicates that technology change and HQ-subsidiary cooperation are related. The data support that firms facing a high rate of technology change stress the relationship between headquarters and foreign subsidiaries. The result also confirms that competitive intensity directly influences HQ-subsidiary cooperation.

• Journal of the Economic Geographical Society of Korea
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• v.18 no.4
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• pp.505-521
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• 2015

Using small and medium sized firms located on 3th seongseo industry complex in Daegu, this study investigated the effects of technology development factors on innovation performance, and suggested the implications in terms of technology policies. Technology development factors are categorized into both fundamental based factors and external cooperation based factors as independent variables. According to the research results, external cooperation based factor positively affects innovation performance, and this positive effect is reported in firms having more than average firm size. Under environment uncertainty, external cooperation based factor plays a key role to increase innovation performance to firms having more than average firm size. Therefore, policy making should be focused on external cooperation, not on fundamental base such as people and infrastructure, and also dissimilar policy suggestion based firm size is needed to be considered.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.2
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• pp.137-144
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• 2006

This paper proposes the design of a robust controller based on disturbance observer which is strong to variation of system parameters, uncertainty of models or external disturbance. The controller consists of a mode based compensator and a feedback controller based on two-loop structure. The compensator in the internal-loop removes internal and external disturbances and a feedback controller in the external loop achieves performance along with given specifications. As a result, it shows that the proposed robust controller can stabilize a system against disturbance and improve controlling performance.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.11
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• pp.4095-4099
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• 2010

Nano-measurement systems such as scanning probe microscopes should be protected against external disturbances. For the design of a scanning probe microscope, the external vibrations need to be characterized and the vibrational properties of the structural frame itself should be modeled. Also, the influences of the external vibration on the apparatus need to be known for its utmost precision. In this paper, the combined vibrational-characteristics of the floor and the structural frame are analyzed and experimentally investigated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.2
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• pp.168-174
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• 2006

We investigated field-effect ion-transport devices based on carbon nanotubes by using classical molecular dynamics simulations under applied external force fields, and we present model schematics that can be applied to the nanoscale data storage devices and unipolar ionic field-effect transistors. As the applied external force field is increased, potassium ions rapidly flow through the nanochannel. Under low external force fields, thermal fluctuations of the nanochannels affect tunneling of the potassium ions whereas the effects of thermal fluctuations are negligible under high external force fields. Since the electric current conductivity increases when potassium ions are inserted into fullerenes or carbon nanotubes, the field effect due to the gate, which can modify the position of the potassium ions, changes the tunneling current between the drain and the source.

• Health Policy and Management
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• v.12 no.2
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• pp.115-135
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• 2002

Many tertiary hospitals have started to establish cooperative relationships with small and medium sized hospitals in Korea. But the performance of the relationship is not satisfactory to both of partners. The relationship and performance of cooperation for small and medium sized hospitals are analyzed according to the framework of inter-organizational cooperation. Data are collected by 4 focal hospital and 34 small and medium sized hospitals through interview and questionnaire. The findings are : a) The cooperation is focused on management area, such as healthcare technology transfer and information sharing, rather than patient referral. b) Patient referral is not yet active in cooperative relationship. But some partner hospitals which is located close and managing internal organization for cooperation show a significant number of referrals. c) The characteristics of high performers are positive attitude about cooperation, and recognition of the relationship as flexible, experiences of cooperation, internal and external management activities.