• 한국노년학
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• v.36 no.3
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• pp.827-846
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• 2016

The presented study was based on the notions that 1)the age-separated perspective would not be functional for post modern society which characterized by a diversity of life styles and 2)effects of wage peak system have been investigated mainly through managemental efficiency with quantitative analysis. In those notions, this study aimed to investigate effects of wage peak system based on age integration perspective with a qualitative method. Deep case study were executed with four workers who fully understand regarding wage peak system. Results showed that three sub categories were drawn in the meaning focused on issues of wage peak system; uneasy attention on workers who applied for wage peak system; pro and con of wage peak system for aged workers; achieving age integrated environment through mutual understanding.

• Journal of Digital Convergence
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• v.17 no.6
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• pp.287-296
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• 2019

This study is a qualitative research attempted to understand meaning and essential structure of experience of nursing students who received simulation training and video watching education. The collected data were analyzed using the Colaizzi method among the phenomenological methods. The results of the study showed that the simulation practice was divided into three categories (experience of clinical nursing in advance, benefit of simulation exercise, limitation of simulation exercise) and 14 themes. Video watching education was derived from three categories (convenience of education, increase of educational effect, lack of knowledge transfer) and 6 themes. In conclusion, it is suggested that the simulation training and the video watching education should be reflected the results of this study in order to apply to the nursing curriculum effectively.

• 한국노년학
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• v.32 no.3
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• pp.835-850
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• 2012

The recent trend shows that the number of internet users among older adults and their level of the ability to use internet have been increased. The purpose of this study is to investigate the phenomenon of senior information technology. Using qualitative descriptive method, this study aims to explore how and in which context older adults use internet. It also aims to address the nature and the outcomes of elderly people's use of internet in their daily lives. In-depth interviews with 16 older participants were analyzed with qualitative content analysis and constant comparison method. The finding shows as follows: (1) agonies felt by the "ambiguous" age group in the modern society, (2) the analogue generation joining the digital, (3) daily changes according to the internet use, (4) senior information technology and its flip side of coin. Based on the research findings, implications for senior information policy are addressed in three ways: promoting productive use of internet among older adults, meeting their health-related concerns using internet, and finding ways to integrate the idea of humanities into senior information technology.

• (The)Study of the Eastern Classic
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• no.73
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• pp.327-360
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• 2018

Ryu Seongryong, a Confucian scholar and politician, are two sides of the same coin that cannot be separated from each other. The scholarship of Confucian intellectuals is oriented toward the practice of the managing state and salvation of the world(經國濟世), and the precise study of historical precedent and political scene affects the success or failure of politicians. Ryu was able to become a real savior of Joseon Dynasty in crisis, because he synthesized dialectically both without distinction between theory and field. However, previous studies on Ryu did not pay attention to these points. In this article, I would like to start from the point that Ryu was interested in the Learning of Wang Yangming without being satisfied with the Neo-Confucianism. And I want to emphasize that he had a pragmatic view that was different from the orthodox scholars and that he was able to demonstrate his ability to cope with crisis even when Joseon was hit by the Japanese invasion of 1592. In short, this article seeks to re-examine Ryu's life in terms of pragmatism and realism which pursued a balance between learning and practice.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.9 no.4
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• pp.85-97
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• 1999

A blind signature scheme is a protocol allowing verifier to obtain a valid signature for a message m from a signer without him seeing the message. This means that the bank in collaboration with the shop cannot trace the electronic cash to user. However anonymous electronic cash also facilitates fraud and criminal acts such as money laundering anonymous blackmailing and illegal purchaes. Therefore in this paper we propose fair blind signature scheme based on KCDSA which is a domestic digital signature scheme and it apply a electronic cash system. In particularly a proposed electronic cash system have an anonymity control ability which trace a user who make use a electronic cash illegally in association with a trusted center.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.1
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• pp.73-85
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• 2001

Electronic check schemes are more efficient than electronic coin scheme with respect to computational costs and the amount of information exchanged. In spite of these, difficulties in making a refund reusable and in representing the face value of a check have discouraged its development. In this paper, a new online electronic check system is presented, which solves the above problems. This system uses the partially blind signature to provide user anonymity and to represent the face value of a check. The partially blind signature enables us to make the format of refunds and initially withdrawn checks identical. Thus, it allows refunds to be reused to buy goods without any limitatiosn. Both initially withdrawn checks and refunds in our system guarantee untraceability as well as unlinkability. We also use a one-time secret key as the serial number of a check to increase the efficiency of payments. The presented check system also provides multiple offline shopping sessions to minimize the number of online messages handled by a bank. During the multiple offline shopping session, we use a one-way accumulator to provide non-repudiation service. We also analyze our new systems our new system\`s security, efficiency, and atomicity.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.1
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• pp.33-42
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• 2002

We present a systematic way to armor a zero-knowledge interactive proof based identification scheme that has badly chosen keys. Keys are sometimes mistakenly chosen to be weak(neither random nor long), and a weak key is often preferred to a strong key so that it might be easy for human to remember. Weak keys severely degrade the security of ZKIP based identification schemes. We show using off-line guessing attack how the weak key threats the security of ZlKIP based identification schemes. For the proper usage of ZKIP, we introduce a specialized form of ZKIP, which has a secret coin-tossing stage. Using the secret coin tossing, a secure framework is proposed for ZKIP based identification schemes with weak key in the ideal cipher model. The framework is very useful in password based authentication and key exchange protocol

• Journal of radiological science and technology
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• v.44 no.1
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• pp.1-8
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• 2021

The purpose of this study was to analyze the effect of automatic exposure control (AEC) control factors in digital radiography systems based on the fine contrast images using coin phantoms. The AEC control factors were targeted at the range of dominent zone, sensitivity, and density. The dominent zone was divided into cases where a single coin was used to cover the field configuration, and cases where seven coins were used to cover the field configuration. The sensitivity was classified into three stages (200, 400, 800) and the density was classified into three stages (2.5, 0, 2.5). Image quality was evaluated by signal to noise ratio (SNR) and contrast to noise ratio (CNR). Then, the automatically exposed tube current was measured. As a result, the X-ray image of seven coins obtained a result value of about 1.2 times higher for SNR and 1.9 times higher for CNR than the X-ray image for one coin. The tube current was also about 1.6 times higher. In conclusion, In AEC, the higher the field configuration and dominent zone are matched and the higher the density, the lower the sensitivity, which increases the tube current and CNR, which increases the image quality. Therefore, it is judged that the appropriate setting of the range of dominent zone, sensitivity, and density of the control, which is the AEC control factor, could improve the fine contrast of images.

• Journal of the Korean Electrochemical Society
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• v.27 no.1
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• pp.8-14
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• 2024

Austenitic stainless steel 316L has been used a lot of applications because of its high corrosion resistance and formability. In addition, copper brazing is employed to create complex shape of 316L stainless steel for various engineering parts. In such system, copper-based filler metals make galvanic cell at metal/filler metal interface, and it accelerates corrosion of stainless steel. Furthermore, Cu-rich region formed by diffused copper in austenitic stainless steel can promote a pitting corrosion. In this study, we used an ammonia (NH₃) gas to nitride the 316L stainless steel for improving the corrosion resistance. The thickness of the nitride (nitrogen high) layer increased with the treatment temperature, and the surface hardness also increased. The potentiodynamic polarization test showed the improvement of corrosion resistance of 316L stainless steel by enhancing the passivation on nitride layer. However, in case of high temperature nitriding, a chromium nitride was formed and its fraction increased, so that the corrosion resistance was decreased compared to the intact 316L stainless steel.

• Journal of Advanced Navigation Technology
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• v.28 no.4
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• pp.544-551
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• 2024

In this study, the electrochemical polarization data required for the simulation of the plating process, simulation of plating conditions, and characterization of the plating layer were discussed. The electrochemical polarization data obtained by potentiodynamic polarization tests and potentiostat analysis of Ni and Cu were used to observe changes in the overvoltage distribution with the flow conditions of the plating solution. In the simulation of plating conditions, the current density distribution and plating thickness distribution were evaluated under different variables to analyze the influence of the location and number of contacts on the rack pins on the plating quality. Simulation results under variables such as anode geometry, interpole distance, auxiliary anode placement, and variation of substrate spacing were used to explore ways to improve plating thickness deviation. Additionally, plating layer characterization analyzed the thickness, adhesion, and delamination of the plating layer with and without buffer layer formation. The simulation results can be utilized as important basic data for improving the efficiency and quality of the plating process.