• Journal of KIISE:Information Networking
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• v.30 no.3
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• pp.371-376
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• 2003

As Mobile Internet gets more popular, the switchover of E-Commerce to M-Commerce gets faster and many service providers offer diverse M-Commerce service by using mobile technology. Also, as M-Commerce makes rapid progress, the security protocol gets more widely recognized for its significance. In particular, WAKE(Wireless Authentication and Key Establishment) protocol carried out wirelessly is of great importance, since the user and service provider must get through to carry out the M-Commerce. Key recovery method is a part of the key management in order to provide an emergency recovery of key whenever necessary, like when the user lost the key or the cryptosystem was illegally used. The ASPeCT project first tried to support the key recovery function in WAKE Protocol Since then, a variety of WAKE Key Recovery protocols have been proposed. In this thesis, problems of WAKE Key Recovery protocols proposed so far are analyzed and new WAKE Key Recovery protocol is suggested to solve those problems.

• Progress in Superconductivity and Cryogenics
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• v.24 no.3
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• pp.41-46
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• 2022

The superconducting properties of high temperature superconducting (HTS) GdBCO coated conductor (CC) tape (Ag/GdBCO/Buffer-layers/Stainless Steel) were investigated, specifically a series of samples prepared by vacuum heat treatment (200℃ to 600℃), using a Quantum Design PPMS-14. The critical current density J_c value was obtained by applying the modified Bean model to the irreversible magnetization ∆M_irr(H) data which was estimated from the magnetization M(H) loop. The reduction rates of lnJ_c and T_c values according to the increase of the vacuum annealing temperature T_an were d(lnJ_c)/dT_an = - 0.016 A/(cm²∙℃) and dT_c/dT_an = - 0.24, respectively. We examined the effect of recovery temperature T_re (475℃ to 700℃) and recovery duration time t (0.5 h to 24 h) on the restoration of previously completely lost superconductivity in samples that subsequently received heat treatment in an O₂ gas flow space. All samples were fully restored to superconductivity by heat treatment in an O₂ gas flow space. The recovery temperatures T_re (475℃ to 700℃) and recovery duration times t (0.5 h to 24 h) were both independent of the superconductivity recovery characteristics.

• Journal of Industrial Convergence
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• v.20 no.12
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• pp.97-106
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• 2022

The aim of this study was identify national forensic psychiatric hospital nurses' attitudes, perceived meaning, facilitators and barriers to the recovery of mental health. A descriptive study design was used. The participants were 100 nurses working in a national forensic psychiatric hospital. The collected data was analyzed by descriptive statistics, independent t-test, ANOVA, scheffe-test using SPSS 26.0 WIN program. Also, content analysis was used for the responses described by the participants. The participants attitude toward recovery from mental health was positive(3.90±0.41), attitude showed significant differences in certification of psychiatric mental health nurse practitioner(t=-2.06, p= 042), certification of addiction nurses(t=-2.36, p= 020). The meaning of recovery that participants perceived were symptom mitigation(42.0%), barriers were family indifference and prejudice(31.0%), facilitators were medication, psychiatric rehabilitation program and therapeutic interviews(33.0%). It is necessary to provide education to improve nurses' understand to mental health recovery, organizational efforts are needed to establish a family support system and therapeutic environments for the recovery of mentally disordered offenders.

• Transactions of the Korean Society of Automotive Engineers
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• v.20 no.2
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• pp.21-29
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• 2012

A dual loop waste heat recovery system with Rankine steam cycles for the improvement of fuel efficiency of gasoline vehicles has been investigated. A high temperature loop (HT loop) only recovers the heat of the exhaust gas. A low temperature loop (LT loop) recovers the residual heat from the HT loop, the coolant heat and the remaining exhaust gas heat. The two separate loops are coupled with a heat exchanger. This paper has dealt with a layout of the dual loop system, the review of the working fluids, and the design of the cycle. The design point and the target heat recovery of the HT boiler, a core part of a HT loop, have been presented. The prototype of the HT boiler was evaluated by experiment. For the performance evaluation of the HT boiler, inlet temperature of the HT boiler working fluid was set equal to the temperature degree of sub-cool of $5^{\circ}C$ at the condensing pressure. The exit condition was the degree of super-heat set at $5^{\circ}C$. The characteristics of the HT boiler such as heat recovery and pressure drops of fluids were evaluated with varying flow rates and inlet temperatures of exhaust gas under various evaporating pressure conditions.

• Korean Business Review
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• v.20 no.1
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• pp.55-71
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• 2007

The purpose of this study is to view the development process of customer satisfaction about service recovery by grafting disconfirmation theory an important paradigm in explaining customer satisfaction upon the Justice theory the recently on-going study of handling unfairness and to substantiate and analyze the influence of the perceived justice the important decisive factor in satisfaction about service recovery and disconfirmation about service recovery on customer satisfaction. The following conclusions are made according this study. First, the higher the expectation about service recovery is, the higher the standard of disconfirmation appears. Second, disconfirmation about service recovery turns out to have positive influence on customer satisfaction about service recovery. Third, the higher the perceived justice about service recovery is, the lower the level of disconfirmation about service recovery appears.

• JSTS:Journal of Semiconductor Technology and Science
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• v.4 no.4
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• pp.275-279
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• 2004

A new burst mode clock and data recovery circuit is realized that improves the previousldy-known gated-oscilletor technique with half rate clock recovery, The circuit was fabricated with 0.25um CMOS technology, and its functions were confirmed up to 1 Gbps.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.05a
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• pp.829-834
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• 2002

Carbonation of concrete used impregnation alkalization agent construction reinforcement, recovery of pH, elevation improve, in which efficiency decline mternal force of number and durability because of impregnation alkalization agent applyment general standard, used concrete. Material quality not understanding lack of study and stadard. This study investigate change of PH. recovery depth of impregnation alkalization agent, recovery depth belong a mount of aggregate that comparision, analysis parity.

• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.487-489
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• 2005

This paper proposes a symbol timing recovery method that is simple in structure and can provide high speed symbol synchronization. Transmitter and receiver are not synchronized in communication systems using digital modulation. Receiver should search the timing variation of transmitter continuously. The proposed timing recovery method searches sample position by comparing previous sample value with next sample value. This method can be applied to digital and optical transceivers with high data rate.

• Journal of Aerospace System Engineering
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• v.10 no.2
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• pp.22-26
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• 2016

Whole airplane recovery parachute system(WARPS) is a auxiliary safety system to protect occupants in emergency situation where recovery to normal flight condition is impossible. In this paper, application and certification cases of WARPS for Part 23 small airplane is introduced and considerations in certification of the WARPS installed airplane are provided in terms of performance of parachute, function and operation, loads and strength and protection of occupants.

• Proceedings of the CALSEC Conference
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• 2003.09a
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• pp.109-114
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• 2003

WS-BPMS(web service driven business process management system)은 기업 내 또는 비즈니스 파트너들 간의 비즈니스 프로세스를 체계적으로 통합, 관리하여 프로세스를 개선하고 자동화한다. 이는 비즈니스 프로세스를 검색한 후 BPEL4WS, BPML 등의 프로세스 메타모델을 이용하여 새 프로세스를 디자인하고 BPMS위에 전개 실행하는 과정을 거치게 된다. 디자인된 프로세스는 복잡하여 그 실행에 있어 체계적이고 확고한 기반을 바탕으로 운영되어야 한다. 이를 위해 본 논문에서는 BPMS의 운영에 있어 pi-calculus를 기반으로 한 structured exception handling 방법론과 transaction 모니터링을 통한 backward recovery 방법을 제시한다.