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집속형 레이저 유도 초음파를 이용한 박판에서의 결함 검출
정지홍,김홍준,장경영 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
An are array slit is used for generating the focused Lamb wave by laser, where spatially expanded Nd:YAG pulse laser is illuminated through the are array slit on the surface of a sample plate to generate the Lamb wave of the same pattern as the slit. Then the generated Lamb wave is focused at the focal point of which distance from the slit position is dependent on the curvature of slit arc. The focusing effect enables to acquire higher intensity of wave at the focus, better SNR in the received signal, and improved spatial resolution than when we use the conventional line array slit. In order to show the usefulness of the proposed method, experiments is carried out for the detection of the artificial linear and circular defects on a thin aluminum plate and proposed quantitative analysis of the defect size.
Multimedia System의 사용자 인터페이스에 관한 연구
정지홍 同德女子大學校 1995 同大論叢 Vol.25 No.1
The purpose of this paper is on Multimedia based user interface. At first, the background of the user interface continuum are discussed and command-line interface, menu driven interface graphical user interface and object-oriented user interface. I surveying method of the Visual shape, animation and sound. With Multimedia, things should look move, and sound like they work, and they should work like look, move and sound! It can make better help define and distinguish how Multimedia based user interface works with the various human sensory mechanisms.
독거노인의 자산이 우울에 미치는 영향에 대한 건강증진행위 매개효과
정지홍 인문사회 21 2022 인문사회 21 Vol.13 No.3
This research focused on the economic status and behavioral patterns of the elderly living alone, and tried to examine how the economic status of assets and positive behavioral health promotion behaviors affect the depression of the elderly living alone. Using the 2018 KLoSA (Korean longitudinal study of ageing), frequency analysis and hierarchical regression were performed on 4,630 elderly living alone over the age of 65. The results showed that assets of the elderly living alone negatively affected depression and positively affected health promotion behaviors. It was also verified that health promotion behavior variable has a partial mediating effect between assets and depression. In direct channel, the more assets the elder had, the less depressed they were, and in indirect channels, more assets increased health promotion behaviors, which decreased depression. Programs for Assets management and health promotion behaviors must adopt an integrated approach taking economic, behavioral, and psychological conditions into account.
장애인을 위한 화면 키보드(on screen keyboard) 디자인에 관한 연구
정지홍 同德女子大學校 1997 同大論叢 Vol.27 No.1
The advancement of computer environment is not simply increase in processing speed. Instead, it represents increasing ease of use to the user. Computers have now passed the point of simply being a tool for the disabled and have become the very element in which the physically challenged are able to overcome their obstacles. In this study, we look for ways to improve getting in touch with and communicating withthe physically challenged individuals withthe aid of computers. There are two methods of input on a computer-keyboard and pointing device. This article will illustrate how individuals who cannot operate a keyboard can simulate the use of a keyboard by using an "on screen keyboard" with a pointing device. Typing a large amount of information requires dexterity. If an individual is not able to type fast enough, a way to decrease the number of keystrokes is used. One such method, Word Prediction System should bring about a more effective way for input. Such methods give ability to input words to individuals who can freely maneuver their hands and/or feet. Also, the "on screen keyboard" does not only act as a keyboard substitute but also redices the space taken up by a real keyboard thus enhancing the mobility of the computer used by the disabled. This is not only beneficial to the disabled individual but can also benefit the computing environment in a limited environment.
3D printing inorganic-organic hybrids for bone repair
정지홍 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.1
Inorganic-organic class II hybrids have two different phases that form inter-penetrating networks via covalent bonding. This fine interaction provides opportunity to fabricate materials in bottom-up approach, which allows control over their physical and biological properties. In previous studies, various polymer-SiO2 hybrids were fabricated with well-defined polymers for bone regeneration. However, it is challenging to produce hybrids with controlled porous architectures with pore inter-connects, which is essential for vascularization and cell transportations. Here, printability of inorganic-organic hybrids were investigated. Polymer source was introduced to silica network via sol-gel process. The hybrid 'sol' was 3D printed to grid-like pattern which resembled trabecular bone structure. Additionally, we explored potential of the hybrid scaffolds as bone substitute material.