• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.404-406
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• 2015

128-비트 마스터키를 지원하는 블록암호 CLEFIA-128의 저면적 하드웨어 구현에 대해 기술한다. 라운드 키 생성을 위한 중간값 계산과 라운드 변환이 단일 데이터 프로세싱 블록으로 처리되도록 설계하였으며, 변형된 GFN(Generalized Feistel Network) 구조와 키 스케줄링 방법을 적용하여 데이터 프로세싱 블록과 키 스케줄링 블록의 회로를 단순화시켰다. Verilog HDL로 설계된 CLEFIA-128 프로세서를 FPGA로 구현하여 정상 동작함을 확인하였다. Vertex5 XC5VSX50T FPGA에서 823 slices로 구현되었으며, 최대 145 Mhz 클록으로 동작하여 105 Mbps의 성능을 갖는 것으로 예측되었다.

• 전자공학회논문지
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• 제49권12호
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• pp.142-146
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• 2012

Today, the demand for high-speed data communication and mobile communication has exploded. Thus, there is a growing need for optical communication systems that convert large volumes of data to optical signals and that accommodate and transmit the signals across long distances. Digital optical communication with these characteristics consists of a master unit (MU) and a slave unit (SU). However, the digital optical units that are currently commercialized or being developed transmit data without compression. Thus, digital optical communication using these units is restricted by the quantity of optical frames when adding diversity or operating with various combinations of CDMA, WCDMA, WiBro, GSM, LTE, and other mobile communication technologies. This paper suggests the application of a data compression algorithm to a digital signal processor (DSP) chip as a field programmable gate array (FPGA) and a complex programmable logic device (CPLD) of a digital optical unit to add separate optical waves or to transmit complex data without specific changes in design of the optical frame.

• 한국CDE학회논문집
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• 제13권6호
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• pp.429-439
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• 2008

With a remote operated manipulator system, the situation at a remote site can be rendered through remote visualized image to the operator. Then the operator can quickly realize situations and control the slave manipulator by operating a master input device based on the information of the virtual image. In this study, the remote operator visual support system (ROVSS) was developed for viewing support of a remote operator to perform the remote task effectively. A visual support model based on virtual environment was also inserted and used to fulfill the need of this study. The framework for the system was created by Windows API based on PC and the library of 3D graphic simulation tool such as ENVISION. To realize this system, an operation test environment for a limited operating site was constructed by using experimental robot operation. A 3D virtual environment was designed to provide accurate information about the rotation of robot manipulator, the location and distance of operation tool through the real time synchronization. In order to show the efficiency of the visual support, we conducted the experiments by four methods such as the direct view, the camera view, the virtual view and camera view plus virtual view. The experimental results show that the method of camera view plus virtual view has about 30% more efficiency than the method of camera view.

• 제어로봇시스템학회논문지
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• 제21권3호
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• pp.243-249
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• 2015

In direct vehicle teleoperation, a human operator drives a vehicle at a distance through a pair of master and slave device. However, if there is time delay, it is difficult to remotely drive the vehicle due to slow response. In order to address this problem, we introduced a novel methodology of shared vehicle teleoperation using a virtual driving interface. The methodology was developed with four components: 1) virtual driving environment, 2) interface for virtual driving environment, 3) path generator based on virtual driving trajectory, 4) path following controller. Experimental results showed the effectiveness of the proposed approach in simple and cluttered driving environment as well. In the experiments, we compared two sampling methods, fixed sampling time and user defined instant, and finally merged method showed best remote driving performance in term of completion time and number of collision.

• 한국멀티미디어학회논문지
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• 제20권2호
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• pp.271-278
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• 2017

This paper introduces a user-friendly PLC (programmable logic controller) monitoring and control system of heavy machinery using Android based smartphone. The proposed system will control diesel generator and many such like machine without a dedicated PC with respect to similar system and offers a new communication protocol for handling it. The smartphone controls the generator via Wi-Fi, through which it connects to the Raspberry pi which will be installed in the PLC panel to setup the communication between them. Furthermore, Raspberry pi connects to two devices, one is PLC which gives the status and current information of the machine and to ON/OFF the machine. This proposed system used RS485 as a key mediator for data exchanging between Raspberry PI(master) and PLC(slave). RS485 allows multiple devices (up to 32) to communicate at half duplex on single pair of wires and provides a long connectivity area (up to 1200 meters) as compared to another device. This proposed system specially focused on accurate data flow between smartphone and PLC panel.

• 한국사회복지학
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• 제40권
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• pp.5-37
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• 2000

The purpose of this study is to find out some characteristics of the family functions of single mothers to provide some useful data for the development of programs which may help single mothers to improve their family functions. The McMaster Family Assessment Device (FAD) which is composed of problem solving function (PS), communication function (CF), role function (RC), emotional reaction function (ER), emotional involvement (EI), behavioral control function (BC), and general function (GC) and McCubbins' FSI were administered to single mothers and their adolescent children and mothers and their adolescent children of ordinary families (control family). The single mothers' perception of their family function was lower than that of control family mothers in an the 7 categories of FAD. The perceptions of the family function of the single mothers' children were lower than those of control family mothers' children. There was on significant difference between the perceptions of single mothers and their children in PS, ER, EI, GC of their family. However, single mothers' perception in RC and BC was lower than that of their children, and the children's perception in CF were lower than that of their mothers. Single mothers who fall on the period of single motherhood was shorter than 7 years perceived their families' function as lower than that of single mothers' who fall on the periods of single motherhood longer than 7 years in all categories. Generally speaking, the single mothers' family functions were lower than that of control family. The different characteristics of each single mother's family functions should be considered in developing programs for single mothers.

• 한국통신학회논문지
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• 제16권10호
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• pp.992-1000
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• 1991

현대는 생산성 향상을 위하여 이런 방법이 사용되는데 그중 공장 측면에서는 공장 자동화를 함으로서 생산성 향상을 기하는 방법을 사용하고 있다. 공장 자동화의 첫 단계는 각 단위 공장의 자동화이다. 우리나라 현황을 보면 소수의 발전된 공장의 경우 라인의 자동화가 구축되어 있으며 대다수의 기업은 단위 공정의 자동화 장치가 설치되고 있다. 그러나 현재 설치된 장비로서 더 이상의 생산성을 높이기 위해서는 각 단위 공정간의 협력 또는 공조체계 및 사무자동화와의 인계가 이루어져야 한다. 이에 본 논문에서 제시된 공정 감시 제어 SYSTEM은 각 공정의 자동화를 이루고 각 단위 공장의 자동화를 이루고 각 단위 공정을 MAIN COMPUTER와 연결하여 모든 공정을 MASTER SYSTEM화하여 통계처리 및 감시 기능을 하고자 하여 생산성을 향상시키고자 한다.

• Human Ecology Research
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• 제53권6호
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• pp.619-628
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• 2015

Baby boomers who have rebuilt the Korean economy over the last half a century are now transitioning into a silver generation who are over 65 years of age. New silver consumers are qualitatively and quantitatively different from the previous generation and are considered to be 'the single most consumption-leading generation.' The number of new silver consumers using department stores and traditional markets has increased. SPSS ver. 21.0 was used with the methods of frequency analysis, t-test, one-way analysis of variance (ANOVA), device master record test, and regression analysis. This research studies consumer satisfaction of new silver consumers on department stores and traditional markets among retailing. The improvement of the parking environment is the most urgent issue for traditional markets because the long-term assessments of parking areas indicate that it is necessary to provide improved convenience for consumers. Salesman satisfaction has improved and consumer satisfaction ranks salesman satisfaction high for traditional markets; however, price satisfaction is low and the distribution system should be improved to supply products at a lower price. Salesman and price satisfaction should be improved at depart stores. Traditional markets should also promote consumer satisfaction through consistent management to make consumers trust information in regards to quality control and production and distribution; in addition, department stores should increase consumer satisfaction by maintaining store systems such as product diversification and display, cleanness, and atmosphere.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 춘계학술대회 논문집
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• pp.513-516
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• 2008

We have replicated nanopillar arrays using injection molding process of active heating and cooling method by several peltier devices. The injection melding has a high accuracy ed good reproducibility that are essential for mass production at low cost. Conventional molding processes widely use the water-based mold heating and air cooling methods. However, in case of replication for nano-patterned structures, it caused several defects such as air-flow mark, non-fill, sticking and tearing. In this study, periodic nano-scale patterns are replicated by using injection molding with Peltier devices. Porous nano-scale patterns, which have pore diameter range from 120nm to 150nm, were fabricated by using anodizing process. Periodic nano-pore structures ( $20mm\;{\times}\;20mm$) were used as a mold stamp of injection molding. Finally, PMMA with nanopillar arrays was obtained by injection molding process. By using the Peltier devices, the temperature of locally adiabatic molds can be dramatically controlled and the quality of the molded patterns can be slightly improved.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2015년도 추계학술발표대회
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• pp.740-743
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• 2015

The increasing complexity of integrated circuits and IP-based hardware designs have created the risk of hardware Trojans. This paper introduces a new type of threat, the coherence-exploiting hardware Trojan. This Trojan can be maliciously implanted in master components in a system, and continuously injects memory read transactions on to bus or main interconnect. The injected traffic forces the eviction of cache lines, taking advantage of cache coherence protocols. This type of Trojans insidiously slows down the system performance, incurring Denial-of-Service (DoS) attack. We used Xilinx Zynq-7000 device to implement and evaluate the coherence-exploiting Trojan. The malicious traffic was injected through the AXI ACP interface in Zynq-7000. Then, we collected the L2 cache eviction statistics with performance counters. The experiment results reveal the severe threats of the Trojan to the system performance.