• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.1
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• pp.68-75
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• 2009

As the recent performance of microprocessor is improving quickly, the necessity of cache is growing because of the increase of the access time of main memory. Every block of direct-mapped cache maps to one cache line. Although the mapping rule is simple, if different blocks map to one cache line, the miss ratio will be higher than the set-associative cache due to conflicts. In this paper, for the improvement of the direct-mapped cache of OpenRISC, 4-way set-associative cache is proposed. Four blocks of the main memory of the proposed cache map to one cache line so that the miss ratio is less than the direct-mapped cache. Pseudo-LRU Policy, which is one of the Line Replacement Policies, is used for decreasing the number of bits that store LRU value. The OpenRISC core including the 4-way set-associative cache was verified with FPGA emulation. As the result of performance measurement using test program, the performance of the OpenRISC core including the 4-way set-associative cache is higher than the previous one by 50% and the decrease of miss ratio is more than 15%.

• Journal of KIISE:Information Networking
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• v.28 no.3
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• pp.309-320
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• 2001

This paper deals with security issues in a mobile agent system, especially protecting agent data from malicious agent servers. For this purpose, one-time key generation system, OKGS in short, is proposed. In OKGS, we integrate notions of a one-way hash function and a coupler. One-way function plays a major role in ensuring confidentiality and integrity of agent data. And the notion of a coupler is used to establish inter-relationship among consecutive encryption keys for agent data, i.e. all agent keys form a unidirectional chain. With these two features of OKGS, therefore, only the agent owner, who creates the agent bearing data, can decrypt and protect all the agent data which are gathered in the itinerary.

• Journal of Digital Convergence
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• v.13 no.8
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• pp.473-481
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• 2015

The flood and environment surveillance network on riverside is a network requiring a way to efficiently manage the information from all kinds of sensors, along with an optical communication device that can deliver high-quality video information at high speed. Since on-site prompt recovery is very important especially for communication problems that occurred due to cut-off or aged network, various researches have been carried out on this. However, because the security against outside hacking or outside intrusion with illegal purposes is very important for environment surveillance network, such as the national backbone network, an efficient network maintenance and repair should be enabled while satisfying security and reliability at the same time. A characteristic of requirement is that when security is improved, the efficiency of maintenance and repair drops as they are conflicting to each other. Therefore, this research proposed a system in order to satisfy the conflicting requirement and improve security, by developing a one-way Bypass TAP and an android-based smartphone app that can enable efficient network maintenance and repair.

• Korean Institute of Interior Design Journal
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• v.27 no.1
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• pp.48-57
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• 2018

Recently, cosmetic shops are facing a complicate economy situation and a great number of brands are attempting two-way communication with customers, not one-way communication. 'Brand' equity is important to deliver virtual brand mark as visual image. We have 4 steps for brand identity structure, and this study is about the first 'brand-awareness' and the second step 'brand-image'. We investigated the correlation between brand-awareness and brand-image after searching which spatial elements are highly effective to both steps as we designated 5 cosmetic shops. We already organized the means of spatial analysis and we separated into two elements, constructive and decorative. For constructive element, a shop needs a distinct ceiling and wall design, and for decorative element, strong brand image communication is required through showcase design. We proved that brand awareness and brand image have the correlation, which also can be in direct proportion, by regression analysis. The result of this study shows that improving brand awareness as the primary element for cosmetic road shop can be an effective way to enhance brand image.

• ETRI Journal
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• v.32 no.6
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• pp.854-862
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• 2010

One-way delay variation (OWDV) has become increasingly of interest to researchers as a way to evaluate network state and service quality, especially for real-time and streaming services such as voice-over-Internet-protocol (VoIP) and video. Many schemes for OWDV measurement require clock synchronization through the global-positioning system (GPS) or network time protocol. In clock-synchronized approaches, the accuracy of OWDV measurement depends on the accuracy of the clock synchronization. GPS provides highly accurate clock synchronization. However, the deployment of GPS on legacy network equipment might be slow and costly. This paper proposes a method for measuring OWDV that dispenses with clock synchronization. The clock synchronization problem is mainly caused by clock skew. The proposed approach is based on the measurement of inter-packet delay and accumulated OWDV. This paper shows the performance of the proposed scheme via simulations and through experiments in a VoIP network. The presented simulation and measurement results indicate that clock skew can be efficiently measured and removed and that OWDV can be measured without requiring clock synchronization.

• Journal of the Korean Institute of Telematics and Electronics
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• v.24 no.1
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• pp.115-122
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• 1987

In this paper, we proposed an improved weakly-coupled power divider(TAP UNIT) for CATV and/or MATV systems, by which the degree of freedom in design and density of coupling interval are signifcantly increased compared with the intrinsic one even though the turn ratios are still of discrete values. On the other hand, the new design theory of a generalized n-way power divider with arbitrary dividing ratios, for CATV and/or MATV systems, which consists of ideal multiwinding transformers and resistors only was presented. Since the circuit elements is not frequency dependent, the proposed power divider is to be of considerably broad bandwidth. Furthermore, the experimental verification has been achieved, and, hence, the validity of the design theory proposed here is confirmed.

• Korean Journal of Human Ecology
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• v.17 no.1
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• pp.1-12
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• 2008

The purpose of this study is to examine influences of male salaried employee's marital communication on their job satisfaction and organizational commitment. The subjects of this study were 279 married male employees from 10 companies. The data were analyzed by descriptive statistics, one way ANOVA, Scheffe & Pearson's correlation with SPSSWIN(ver 12.0). There were significant differences according to the young married couple who has school background high, under 10 years of the length of their service in Marital communication And there were positive correlations among the marital communication which were communication agreement, communication contentment and communication smoothness and job satisfaction.

• Korean Journal of Child Studies
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• v.16 no.2
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• pp.113-124
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• 1995

The objective of this study was to clarify the relations among mothers' self-esteem and facilitative communication, to children's self-esteem, and facilitative communication and then to inquire into how these relationships relatively contribute to children's self-esteem. Subjects were 206 elementary school children and their mothers in Anjang. Two types of instruments were used in this study. To measure the children's and mothers' self-esteem, SEI(Self-Esteem Inventory) was to used. To measure mothers' facilitative communication levels, "Mothers' Facilitative Communication Scales" was constructed by the researcher. The statistical procedures used for collected data analyses were correlation, one-way ANOVA, multiful regression. The findings are as following: 1. A significant static correlation was found between mothers' self-esteem and children's self-esteem. 2. Also, a significant static correlation was revealed between mothers' facilitative communication level and children's self-esteem. 3. The level of mothers' facilitative communication discloses a significant difference depending upon the mothers' self-esteem. 4. Mothers' level of facilitative communication affected children's self-esteem rather than the mothers' self-esteem.

• Tunnel and Underground Space
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• v.13 no.4
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• pp.270-278
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• 2003

Transparency on the Total System Performance Assessment (TSPA) is the key issue to enhance the public acceptance for a permanent high level radioactive repository. Traditionally, the study on features, events and processes (FEPs) and associated scenarios has been regarded as the starting point to open the communicative discussion on TSPA such as what to evaluate, how to evaluate and how to translate outcomes into more friendly language that many stakeholders can easily understand and react with. However, in most cases, it has been limited to one way communication, because it is difficult for stakeholders outside the performance assessment field to assess the details on the story of the safety assessment, scenario and technical background of it. Fortunately, the advent of the internet era opens up the possibility of two way communication from the beginning of the performance assessment so that every stakeholder can exchange their keen opinions on the safety issues. To achieve it, KAERI develops the systematic approach from the FEPs to Assessment methods flow chart. All information is integrated into the web based program named FEAS (FEp to Assessment through Scenario development) under development in KAERI. In parallel, two independent systems are also under development the web based QA(Quality Assurance) system and the PA(Performance Assessment) input database. It is ideal to integrate the input data base with the QA system so that every data in the system can checked whenever necessary. Throughout the next phase R&D starting from the year 2003, these three systems will be consolidated into one unified system.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.7
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• pp.3131-3149
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• 2016

In-band Full-duplex (IBFD) wireless communication allows improved throughput for wireless networks. The current Half-duplex (HD) medium access mechanism Request to Send/Clear to Send (RTS/CTS) has been directly applied to IBFD wireless networks. However, this is only able to support a symmetric dual link, and does not provide the full advantages of IBFD. To increase network throughput in a superior way to the HD mechanism, a novel three-way handshaking access mechanism RTS/SRTS (Second Request to Send)/CTS is proposed for point to multipoint (PMP) IBFD wireless networks, which can support both symmetric dual link and asymmetric dual link communication. In this approach, IBFD wireless communication only requires one channel access for two-way simultaneous packet transmissions. We first describe the RTS/SRTS/CTS mechanism and the symmetric/asymmetric dual link transmission procedure and then provide a theoretical analysis of network throughput and delay using a Markov model. Using simulations, we demonstrate that the RTS/SRTS/CTS access mechanism shows improved performance relative to that of the RTS/CTS HD access mechanism.