• The Journal of Advanced Prosthodontics
• /
• v.11 no.3
• /
• pp.147-154
• /
• 2019

PURPOSE. This study aimed to evaluate the effect of two different implant-abutment connection structures with identical implant design on peri-implant bone level. MATERIALS AND METHODS. This clinical study was a patient-blind randomized controlled trial following the CONSORT 2010 checklists. This trial was conducted in 24 patients recruited between March 2013 and July 2015. Implants with internal friction connection were compared to those with external hex connection. One implant for each patient was installed, replacing the second molar. Implant-supported crowns were delivered at four months after implant insertion. Standardized periapical radiographs were taken at prosthesis delivery (baseline), and one year after delivery. On the radiographs, distance from implant shoulder to first bone-to-implant contact (DIB) and peri-implant area were measured, which were the primary and secondary outcome, respectively. RESULTS. Eleven external and eleven internal implants were analyzed. Mean changes of DIB from baseline to 1-year postloading were 0.59 (0.95) mm for the external and 0.01 (0.68) mm for the internal connection. Although no significant differences were found between the two groups, medium effect size was found in DIB between the connections (Cohen's d = 0.67). CONCLUSION. Considering the effect size in DIB, this study suggested the possibility of the internal friction connection structure for more effective preservation of marginal bone.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.15 no.4
• /
• pp.397-405
• /
• 2004

In this paper, performance analysis of mobile phone with internal antenna for PCS band was carried out. The radiation patterns for antenna and mobile phone with internal antenna were simulated by using 3D simulation program, HFSS and SEMCAD. Radiation pattern variation was observed according to installation of LED circuit and ground pattern and by using simulation radiation pattern was improved. And radiation patterns of mobile phones with internal and external antennas were measured by using for field measurement system and chamber. Measured radiation pattern for mobile phone with internal antenna shows good agreement with simulation result. And the radio sensitivities of mobile phones with internal and external antennas were measured by using Agilent E5515C and chamber and compared. The measured radio sensitivity of mobile phone with internal antenna shows proper performances comparable to other model with external antenna. Measured result shows that the difference on averaged co-polar radio sensitivity is 0.12 ㏈.

• Korean Journal of Construction Engineering and Management
• /
• v.5 no.5 s.21
• /
• pp.109-116
• /
• 2004

Recently, many korean construction companies have faced many environmental changes and demands for external changes. This demand for external changes is necessary for all companies that is under the survival of fittest. The internal/external of environmental changes affect the organizations of company largely, and these management organizations have relation with the corporate of management performance closely. In response to that, to be adapted to the environmental change and to raise the corporate of management performance, the construction companies have tried to change the organizations such as organization re-design, organization re-build, organization innovation. Because the organizational structure that is preventive in the growth of companies bring a negative effect, the companies need to have the effective organizations to raise the corporate value. The effective organizations could be used the important indicator that builds the corporate goals and manages the organizations. Also, the organization development and organization management can prepare for environmental changes can be the important base to increase the management performance. Therefore, After surveying and analyzing the character of organization structure in respect to the OLC, this study present the Organization Structure Model that can design the appropriate organization by the growth of companies.

• Journal of Sasang Constitution and Immune Medicine
• /
• v.9 no.1
• /
• pp.1-12
• /
• 1997

Neiging Medicine(內經醫學) based on Yin-Yang and Five elements was the main stream of Korea Traditional Medicine until the end of 19th century. And the establishment of Sasang Constitutional medicine. In this paper, author proved that the Yin-Yang of Sasang Constitutional Medicine was different from that of Neiging Medicine and that explained the Yin-Yang of Sasang Constitutional Medicine as our own medicine. After considering the philosophical and medical background of Sasang Constitutional Medicine, and author researched the Yin-Yang of ontology, structure, function, symptoms in Sasang Constitutional Medicine. Also we compared this with that of Neiging medicine. The results were as follows 1. Neiging Medicine was based on the Yin-Yang and Five elements centering on the nature and Sasang joy, and pleasure centering on the human. 2. The ontology of Sasang Constitutional Medicine were the mind as a unitary substance, the mind and body as a dual substance, and affair, mind, body, and objects as a four substance which were the basic theory of philosophy. 3. Sasang Constitutional Medicine explained social phenomenon with a four substancial structure consisted of affairs, mind, body, and objects, a complex four substancial structure consisted of heaves, human, nature and order, and a three dimension structure including time. 4. On the other hand Neiging Medicine recognized seven emotions as five emotions, Sasang Constitutional Medicine recognized seven emotions as qi, nature, and emotions which consisted of sorrow, anger, joy, and pleasure. The qi had an effect on internal and external part of body and the nature and the emotion had an effect on the upward and downward of body. 5. It was taked great importance to control the up and down balance and the internal and external balance in Sasang Constitutional Medicine instead of reinforcing and reducting method of Neiging Medicine. 6. The Yin-Yang of Korean Traditional Medicine developed centering on the human from centering on the nature and Sasang Constitutional Medicine was a practical medicine compared with Neiging Medicine.

• Journal of Sensor Science and Technology
• /
• v.10 no.6
• /
• pp.304-309
• /
• 2001

A Fiber optic strain sensor for the measurement of the internal strain of a concrete specimen was developed. This sensor was a 11 mm Fiber-optic Fabry-Perot interferometer attached inside a stainless steel pipe of 2 mm diameter. The fabricated strain sensors were embedded in a reinforced concrete structure of $100{\times}100{\times}500\;mm^3$ size and were measured the internal strain of a concrete structure when the external pressure was applied to the structure. For a field application, the strain sensors were attached on the bottom of a real bridge and dynamic loading test were executed. In the test, they showed good sensitivity as a deformation sensor and capability of remote monitoring.

• Korean journal of communication and information
• /
• v.31
• /
• pp.167-192
• /
• 2005

How to facilitate Integrated Marketing Communication (IMC)? An approach to answer this question is to identify an organization's internal and external barriers to IMC and then to resolve them. Eight dimensions emerged from the factor analysis of the barrier items: organizational structure problem, department ego, lack of database, difficulty in analyzing effectiveness, lack of perception on consumer-oriented communication, increasing dependency on an agency, lack of agencies' expertise on IMC, and fear of budget reductions. With regression analyses, this study found that 'organizational structure problem' and 'lack of perception on consumer-oriented communication' were negatively related to IMC and that 'department ego', 'lark of perception on consumer-oriented Communication', 'organizational structure problem', and 'fear of budget reductions' were negatively related to the expectation of IMC usefulness. The findings indicate that organizations surveyed stay at a low level of IMC and urgently needs to resolve internal barriers rather than external ones in order to enhance IMC.

• Proceedings of the Korea Contents Association Conference
• /
• 2006.11a
• /
• pp.213-217
• /
• 2006

4 panels Comic Strips spreads it's story with introduction, development, turn and conclusion. The structure of introduction, development, turn and conclusion adds to the fun of story through the envelopment of deduction, induction so in the work the narrative structure is unfolded so many evolutions in order to communicating with further effective and funny. Therefore the study is mostly mended deduction, induction unfolding on the 4 panels comic strips. The purpose of this study is based on search for formation of the story and comparison of humor comic strips and satire comic strips through analysis of the narrative structure on 4 panels comic strips in internal and external.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1998.10c
• /
• pp.161-166
• /
• 1998

The concrete structures designed and constructed by conventional design concept based on structural performance consideration show sometimes serious durability problem when the structures are exposed to aggressive environment. Because present design system focuses on the structure safety and considers durability indirectly by the concrete mix design and cover depth, the durability of concrete structure cannot be ensured. As the first step to develope the durability design for concrete structure, durability index which represents internal concrete resistance and environment index which represents external environmental exposure are derived quantitatively. In the next step, the durability design system is developed by checking durability limit state with computed two indexes under service life condition by considering of the reliability of structure. Finally, the proposed system is verified with a model problem.

• Ceramist
• /
• v.21 no.1
• /
• pp.64-79
• /
• 2018

Recent years, OLEDs have been progressed intensively and been widely applied to Display and Lighting industry,Almost 100% internal quantum efficiency was achieved by developing new materials and structure optimization. However, external quantum efficiency was still low due to total internal reflection of light inside OLED devices and absorption of light at the surface of metal electrode. In order to improve external quantum efficiency of OLED devices, various kinds of optical functional structures were introduced to inside and outside of OLED devices to increase light extraction efficiency. In this paper, various efforts to apply optical functional structures in OLED devices were reviewed and way to improve light extraction efficency of OLED devices were discussed.

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