• Convergence Security Journal
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• v.23 no.4
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• pp.43-52
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• 2023

Many businesses and organizations use smartcard-based user authentication for remote access. In the meantime, through various studies, dynamic ID-based remote user authentication protocols for distributed multi-server environments have been proposed to protect the connection between users and servers. Among them, Qiu et al. proposed an efficient smart card-based remote user authentication system that provides mutual authentication and key agreement, user anonymity, and resistance to various types of attacks. Later, Andola et al. found various vulnerabilities in the authentication scheme proposed by Qiu et al., and overcame the flaws in their authentication scheme, and whenever the user wants to log in to the server, the user ID is dynamically changed before logging in. An improved authentication protocol is proposed. In this paper, by analyzing the operation process and vulnerabilities of the protocol proposed by Andola et al., it was revealed that the protocol proposed by Andola et al. was vulnerable to offline smart card attack, dos attack, lack of perfect forward secrecy, and session key attack.

• Journal of Convergence for Information Technology
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• v.8 no.1
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• pp.131-138
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• 2018

The purpose of the study was to explore whether the Cyber Motion sickness used VR causes a change in the dynamic balance and fall. For 39 people who voluntarily participated in this study, this study measured the motion sickness questionnaires, the heart rate and stability of limit test in BioRescue. The study used Samsung Gear VR and applied the games to the To the homeland. The game proceeded 20minutes. Although the value of the stability after a VR application is slightly reduced, it did not reach statistical significance. The motion sickness questionnaires increased, and it had a statistical significant impact. Also Heart rate increased and it had a statistically significant impact. A virtual reality game affect for getting motion sickness but it did not affect the dynamic balance. So, cyber motion sickness caused by virtual reality wear does not result in decreased balance and falls.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.7 no.2
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• pp.267-277
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• 2017

One of fundamental problems in developing robust distributed services is how to achieve distributed consensus agreeing some data values that should be shared among participants in a distributed service. As one of algorithms for distributed consensus, Raft is known as a simple and understandable algorithm by decomposing the distributed consensus problem into three subproblems(leader election, log replication and safety). But, the algorithm dose not mention any types of dynamic configuration of participant peers such as adding new peers to a consensus group or deleting peers from the group. In this paper, we present a new consensus algorithm named Raft-D, which supports the dynamic configuration of participant peers by extending the Raft algorithm. For this, Raft-D manages the additional information maintained by participant nodes, and provides a technique to check the connection status of the nodes belonging to the consensus group. Based on the technique, Raft-D defines conditions and states to deal with adding new peers to the consensus group or deleting peers from the group. Based on those conditions and states, Raft-D performs the dynamic configuration process for a consensus group through the log update mechanism of the Raft algorithm.

• Journal of Korean Medical classics
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• v.19 no.4
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• pp.80-85
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• 2006

재(在) "금궤요략(金궤要略)", 제시료금궤당귀산유양혈청열적효능(提示了金궤當歸散有養血淸熱的效能), 소이치태동불안증(所以治胎動不安證). 이재(而在) "동의보감(東醫寶鑑)" 설명료본처방치반산(設明了本處方治半産), 병차설명료예방태열여두진(병且設明了豫防胎熱與痘疹). 유어여차적설명(由어如此的設明), 가이추론금귀당귀산능예방태열(可以推論金歸當歸散能豫防胎熱). 태동불안여반산(胎動不安與半産), 도시인잉부음허이허양조동이발병적(都是因孕婦陰虛而虛陽조動而發病的). 태열시모체적열전우태아이발생적병증(胎熱是母體的熱傳于胎兒而發生的病症). 유우이상적내용(由于以上的內容), 가간도태동불안(可看到胎動不安) 반산(半産) 태열(胎熱), 도시인음허이허양조동적병기소발(都是因陰虛而虛陽躁動的病機所發). 소이파금궤당귀산(所以把金궤當歸散), 용우태동불안여반산적치료급예방(用于胎動不安與半産的治療及豫防), 이차가이확대응용어태열적예방(而且可以擴大應用於胎熱的豫防).

• Journal of the Korean Society for information Management
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• v.13 no.2
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• pp.5-18
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• 1996

For the construction of thesaurus, a thesaurus management system is needed which can process dynamic variations fast and exactly such as input. correction and deletion of words, and definition of new relationship between words. In this paper, I developed a thesaurus management system based on the object-oriented technique and GUI(graphic user interface) screen, and to enhance the effectiveness of information retrieval. I put emphasis on the expansion of synonym, English and Korean words containing the same concept.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.502-504
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• 2010

We propose novel transition rule of cellular automata for image enhancement and sharpening algorithm using it. Transition rule present sequential and parallel behavior. it also satisfy Lyapunov function. This image sharpening was developed and experimented by using a dynamic feature of convergence to fixed points. We can obtain efficiently sharpened image by performing arithmetic operation at the gradual parts of difference of brightness without image information.

• The korean journal of orthodontics
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• v.30 no.3 s.80
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• pp.273-285
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• 2000

The aim of this investigation was to evaluate the differences of two canti-leyer springs by using a new simulation system. This was done using a Calorific machine that compared iron uprighting spring and root uprighting spring. The Calorific machine was designed to allow observation of the whole process of tooth moving, and is composed of three parts(a temperature regulating system, electro-thermodynamic teeth, and an artificial alveolar bone component). The experiment of both mechanics were repeated five times and measured two times. The intra-examiner agreement and inlet-examiner agreement were $96.54\%\;and\;95.73\%$ and these data were statistically tested by paired t-test. The obtained results were as follows. 1. Distal and buccal movement of the anchor teeth were observed greater in the root uprighting spring than the crown uprighting spring. 2. Crown uprighting spring showed distal movement of the crown of lower second molar for 3.29mm but root uprighting spring showed only 1.68mm. 3. Crown uprighting spring exhibited forward movement of mesial and distal root of the lower second molar for 3.91mm, 3.60mm but the root uprighting spring showed 6.76mm, 6.26mm.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.629-632
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• 2009

The interactive art and design can be interpreted as an intelligent system in the aspect of engineering. Because this information is treated and analyzed in real time and then such results is expressed in various media such as image, graphic, sound and etc. after these information are input through the sensor, camera and etc., for the efficient communication between human and production, namely, to communicate the interactive reaction, The image utilizing such interactive is being gradually developed as it widens its region in various art design fields. This research is purposed to make the system, which lets the citizens contact the information naturally by mixing the information for the environment with the interactive art of the arty type, and which lets the citizens feel the surrounding environment directly. This research will construct the live mood in the space itself and is utilized for the public art that can be directly experienced. It can provide the experience in the participation type that acquires the information being harmonized with the human naturally in the more developed type than the concept of the existing static installation. Therefore, it is sincerely required to research the interactive art in utilizing the public design.

• Journal of the Korean Applied Science and Technology
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• v.37 no.6
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• pp.1728-1737
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• 2020

The purpose of this study was to verify the effects of the types of exercise on the health-related fitness among the elderly women, and to provide the information for managing and preventing the chronic disease. 40 elderly women who living in the B metropolitan city participated in the study and randomly divided four groups(control, aerobic exercise, resistance exercise, and combined exercise). The exercise groups performed 50 min, 3 times/week for 8 weeks at RPE 11-13. Low body strength, dynamic balance, static balance, and agility were significantly improved in all exercise groups after the intervention. Cardiovascular endurance was improved in aerobic and combined exercise groups. Consequently, any types of exercise could be improved the daily living fitness for elderly women if exercise intensity were the same. In addition, the combined exercise may be more suitable type of exercise for elderly.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.10
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• pp.138-149
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• 2003

As the Internet is quickly evolving from best-effort networks to business quality networks, billing based on the precise traffic measurement becomes an important issue for Internet Service Providers (ISPs). Billing settlement is necessary not only between ISP and customers but also between ISPs. Currently, most ISPs use a flat rate charging policy. Besides the degree of difficulty in deriving appropriate charging policies agreeable by a concerned party, there are substantial technical challenges to come up with a good usage-based accounting system. Usage-based accounting depending on IP packet header information only is not sufficient anymore due to highly dynamic nature of the development and the use of the Internet applications such as peer-to-peer and network games. They are using port numbers dynamically and even several applications can use the same port number. Thus, more precise means of classifying them and accounting their traffic usages are required. In this paper, we propose a high performance, adaptable, configurable, and scalable content-aware application traffic measurement and analysis system which can achieve very accurate usage-based accounting.