• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.1
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• pp.29-43
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• 2019

In recent years, as the network traffic in the WSN(Wireless Sensor Network) has been increased by the growing number of IoT wireless devices, SDWSN(Software-Defined Wireless Sensor Network) and its security that aims a secure SDN(Software-Defined Networking) for efficiently managing network resources in WSN have received much attention. In this paper, we study on how to efficiently and securely design a PUF(Physical Unclonable Function)-assisted group key distribution scheme for the SDWSN environment. Recently, Huang et al. have designed a group key distribution scheme using the strengths of SDN and the physical security features of PUF. However, we observe that Huang et al.'s scheme has weak points that it does not only lack of authentication for the auxiliary controller but also it maintains the redundant synchronization information. In this paper, we securely design an authentication process of the auxiliary controller and improve the vulnerabilities of Huang et al.'s scheme by adding counter strings and random information but deleting the redundant synchronization information.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.6
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• pp.67-75
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• 2003

The development of mobile phone is growing fast in the all over the world. Besides the basic voice communication, many multimedia services and global roaming service are capable in the 3rd generation mobile telecommunication. Because mobile phone has been the essential tool to communicate, the protection of privacy and the safe transmission are critical ones. In synchronous, asynchronous mode IMT2000 service, the mechanism of mutual authentication and generation of cipher key and integrity key are implemented in smart card chip called UIM, USIM. In this paper, we describe the authentication mechanism of 3GPP and 3CPP2 and its implementation results. Then, we specify a few problems which are not defined in standard.

• Journal of Digital Contents Society
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• v.19 no.8
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• pp.1515-1525
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• 2018

Security threats in the 4th Industrial Revolution have expanded to the issue of safety, but the environment for information security of domestic companies is still at a low level. This study aims to propose policy implications by empirically analyzing factors affecting investment intention. We investigated the state of information security and protection behavior and expanded UTAUT to investigate correlations. The results showed that information assets affect facilitating conditions, and perceived and new concerns have impacts on social influence. Social influence affect experience and habits, but the impact on security investment intentions was rejected. Facilitation conditions, previous experiences and habits have great influences on investment intention, new service security investment intention. The influence of perceived and new concern are low or rejected. There are moderating effects between types of business, size, security organization, experience of infringement, security personnel ratio, and personal information collection. This study will help to establish policies for enhancing the level of information security.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.3
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• pp.239-244
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• 2014

As the usefulness of mobile device is kept growing the privacy of the cloud computing is receiving more attentions. Even though many researches and solutions for privacy matters are suggested we are still worrying about the security problems. In addition most of cloud computing systems uses file-level synchronization which make it difficult to modify a part of a file. If we use data-centric app that stores data on embedded DBMS such as SQLite, a simple synchronization may incur some loss of information. In this paper we propose a solution to build a personal cloud that supports record-level synchronization. And we show a prototype system which uses RESTful web services and the same schema on mobie devices and the cloud storage. Synchronization is achieved by using a kind of optimistic concurrency control.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.5
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• pp.1045-1057
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• 1997

In this paper, we propose an algorithm of block synchronization that uses data withoug synchronization preambles. Block synchronization systems is implemented using the DSP chip employing the proposed algorithm. The data spread of the DFT blocks is proportional to the offset of DFT block and this information is used to achieve the block synchronization in the receiver. The initial bleock synchronization and the clock synchronization between transmitter and receiver are achieved using the early-late removal of the guard interval. The hardware implmentation is carried out using the DSP chip TM320C30 to verify the proposed block synchronization algorithm with the data rate 1200bps. The DSP chip calculates the spread of the 128 complex FFT in the receiver with the system clock 30MHz. It is believed that the proposed synchronization algorithm can be used in the design of OFDM block synchronization with the high processing DSP chip.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.1
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• pp.139-149
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• 2007

Asynchronous OFCDM(Orthogonal Frequency and Code Division Multiplexing) systems must have a cell search process necessarily unlike synch개nous systems. this process is hewn initial synchronization and a three-step cell search algorithm is performed for the initial synchronization in the following three steps: OFCDM symbol timing, i.e., Fast Fourier Transform(FFT) window timing is estimated employing guard interval (GI) correlation in the first step, then the frame timing and CSSC(Cell Specific Scrambling Code) group is detected by taking the correlation of the CPICH(Common Pilot Channel) based on the property yielded by shifting the CSSC phase in the frequency domain. Finally, the CSSC phase within the group is identified in the third step. This paper proposes a modification group code with two or three block of the conventional CPICH based cell search algorithm in the second step which offers MS(Mobile Station) complexity reductions. however, the effect of the reduction complexity leads to degradation of the performance therefore, look for combination to have the most minimum degradation. the proposed block type group code with suitable combinations is the nearly sane performance as conventional group code and has a complexity reduction that is to be compared and verified through the computer simulation.

• Korean Journal of Social Welfare Studies
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• v.42 no.4
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• pp.445-468
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• 2011

Based on the framework of self-determination theory and past relevant literature, the study develops and estimates a causal relationship between intrinsic motivation, career commitment, and turnover intention. The study utilizes data from a cross-sectional survey conducted on 353 child welfare workers of the fields of foster care, child protective services, and child residential care all over the country. The study relies on Structural Equation Modeling(SEM) method. The results of Confirmatory Factor Analysis indicate the validity of measurement model. The results of SEM tests show a good fit of the proposed model. Controlling the level of salary and the working hours of the workers, the model reveals that intrinsic motivation is positively related to career commitment, and that career commitment is negatively related to turnover intention. In other words, the effect of intrinsic motivation on turnover intention is mediated by career commitment. Implications of the findings for practice and study limitations are discussed.

• Journal of Biosystems Engineering
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• v.26 no.2
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• pp.189-196
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• 2001

바이오 센서 개발에 대한 주 동기는 건강보호 산업이었지만, 최근의 연구 동향은 농업 및 생물 생산 시스템 분야로 확산되고 있다. 바이오 센서의 본질과 기능에 관한 일반적인 논의가 간단히 제시되었고, 제자들에 의해 연구된 및 종류의 바이오 센서 예와 그들의 적용에 대해 소개하였다.

• ETRI Journal
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• v.14 no.2
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• pp.16-28
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• 1992

본고에서는 CCITT 표준에 기본을 둔 다양한 전송서비스 능력을 갖는 SDH 망요소들의 모듈화 구현기법을 제시하고, 나아가 이들 망요소들을 응용한 동기식 전송망의 구조를 전송서비스의 보호특성을 강조하여 제시한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.4
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• pp.55-66
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• 2001

In this paper, we analyze the security of OFB encryption mode which is one of the basic modes of operation for the block cipher and the security of 3GPP f8 encryption mode used to provide the data confidentiality over a radio access link of W-CDMA IMT-2000. We provide the lower bound and the upper bound on security of both modes in random function model and random permutation model, respectively, by means of the left-or-right security notion, and prove the security of both modes using a pseudorandom function and a pseudorandom permutation, respectively.