• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.1135-1136
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• 2008

Error correcting codes (ECC) are widely used in all types of memory in industry, including caches and embedded memory. The focus in this paper is on studying of power consumption in memory ECCs circuitry that provides single error correcting and double error detecting (SEC-DED) designed by various evolution strategies. The methods are applied to two commonly used SEC-DED codes: Hamming and odd column weight Hsiao codes. Finally, we conduct some simulations to show the performance of the various methods.

• 지식경영연구
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• 제6권2호
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• pp.67-90
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• 2005

Attention has been focused recently on the concept of shared cognition which encompasses the notion that effective team members hold knowledge that is overlapping and complementary with teammates. This shared cognition is expected to improve team effectiveness. In contrast to the continued efforts in developing theoretical approach of shared cognition, empirical studies are meager. Thus, we conducted an empirical study to investigate the role of shared cognition on team effectiveness. This study classifies shared cognition into two types, team mental model and transactive memory system, by shared meaning. A total of 121 new product development teams in the IT industry were surveyed for the data collection. The results of analysis can be summarized as follows: first, team mental model has a positive influence on team performance, team innovative behavior and team learning effect. And the relation with team mental model and team performance is moderated by the similarity of knowledge structure among the expert. Second, transactive memory system has a positive influence on team performance, team innovative behavior and team learning effect.

• 대한본초학회지
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• 제36권2호
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• pp.1-9
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• 2021

Objectives : Gossypium arboreum (cotton) is traditionally used to treat various health disorders. However, anti-amnesic effect of G. arboreum has not been reported. The objective of this study was to investigate in-vivo the anti-amnesic effects along with in vitro antioxidant and acetylcholinesterase (AChE) inhibition potential in G. arboreum seed essential oil. Methods : The essential oil of G. arboreum obtained by solid phase microextraction (SPME) techniques were identified by gas chromatography-mass spectroscopy (GC-MS). 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) assay were performed to determine the antioxidant activity at various concentrations (312.5, 625, 1250, 2500, 5000, 10000 ㎍/㎖. Y-maze, passive avoidance and Morris water maze tests were carried out to evaluate improved effect on scopolamine (1 mg/kg)-induced memory dysfunction at the dose level of 50, 100 and 200 mg/kg. Donepezil (5 mg/kg) was used as a positive drug control. We performed acetylcholinesterase (AChE) activity assay in ex vivo. Results : Five volatile compounds were identified in G. arboreum. The assays of DPPH and ABTS revealed that G. arboreum increased antioxidant activity in a dose-dependent manner. G. arboreum ameliorated the percent of spontaneous alternation in the Y-maze test, shortened step-through latency in the passive avoidance test, and increased swimming time in the target zone in the Morris water maze test. In addition, G. arboreum inhibited the AChE activity. Conclusions : Based on these findings, G. arboreum may aid in the prevention and treatment of learning and memory-deficit disorders through antioxidant and AChE inhibitory activities.

• 한국정보시스템학회지:정보시스템연구
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• 제25권3호
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• pp.175-196
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• 2016

Purpose The development of new products in automobile parts industry plays an important role. Nowadays, automobile industry is one of the most important industries in the world, because automobile industry includes the industries of steel, machinery, electronic, etc. As a result, automobile industry embodies a country's level of development and competitiveness. The purpose of this study is to analyze the relationship between team characteristics such as communication, familiarity, and contiguity, and team performance through TMS in the process of new products development in automobile parts industry. Design/Methodology/Approach Based on real phenomenon of Korean automobile parts industry, this study tried to figure out the influence of TMS between team members for new product development on team performance. Thus, this study adopts communication, familiarity and contiguity as antecedents, and TMS with specialty, credibility and coordination as a mediating variable, and adopts team performance as a dependent variable. The data of questionnaire were collected from team managers who belong to new product development team in automobile parts firms. 171 questionnaires as data unit of group level from 80 Korean automobile parts firms were collected using face-to-face interview methods. Findings This study proved empirically that the relationship between antecedents and TMS has a positive influence, and TMS also has a positive influence on team performance. This study provides the managers an insight that automobile parts companies should pay more attention to set up TMS in order to improve higher performance between their team members for new product development of automobile parts.

• Wind and Structures
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• 제30권2호
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• pp.211-217
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• 2020

Vibrations of a wind turbine blade have a negative impact on its performance and result in failure of the blade, therefore an approach to effectively control vibration in turbine blades are sought by wind industry. The small domestic horizontal axis wind turbine blades induce flap wise (out-of-plane) vibration, due to varying wind speeds. These flap wise vibrations are transferred to the structure, which even causes catastrophic failure of the system. Shape memory alloys which possess physical property of variable stiffness across different phases are embedded into the composite blades for active vibration control. Previously Shape memory alloys have been used as actuators to change their angles and orientations in fighter jet blades but not used for active vibration control for wind turbine blades. In this work a GFRP blade embedded with Shape Memory Alloy (SMA) and tested for its vibrational and material damping characteristics, under martensitic and austenite conditions. The embedment portrays 47% reduction in displacement of blade, with respect to the conventional blade. An analytical model for the actuated smart blade is also proposed, which validates the harmonic response of the smart blade.

• 한국컴퓨터산업학회논문지
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• 제7권3호
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• pp.145-154
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• 2006

본 논문에서는 프로그램 최적화를 위해 개선된 추론적 부분 중복 제거(SPRE) 알고리즘을 제안했다. 본 논문에서 제안한 SPRE 기법은 컴파일러의 프로필링 기법 등을 통해 얻어진 실행 빈도에 대한 정보를 이용하여 실행 속도 최적화를 수행한다. 제안하는 알고리즘의 첫 번째 목적은 프로그램 실행 시 요구되는 메모리의 감소이며 두 번째는 실행 시간을 감소시키는 것이다. 단지 프로그램의 실행 속도만을 고려하는 경우에는 메모리 요구가 크게 증가하기 때문에 메모리 감소에 대한 고려도 중요하다. 이것은 프로그램을 실행하는데 요구되는 메모리의 크기가 실행 속도 보다 더 중요한 임베디드 시스템에 적합한 최적화 기법이다. 본 논문에서는 제어흐름그래프를 네트워크로 구성하여 분할하는데 사용하는 Min-Cut 알고리즘을 구현한다.

• 한국자동차공학회논문집
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• 제17권3호
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• pp.127-141
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• 2009

While the ever-increasing complexity of automotive software systems can be effectively managed through the adoption of a reliable real-time operating system (RTOS), it may incur additional resource usage to a resultant system. Due to the mass production nature of the automotive industry, reducing physical resources used by automotive software is of the utmost importance for cost reduction. OSEK OS is an automotive real-time kernel standard specifically defined to address this issue. Thus, it is very important to develop and exploit kernel mechanisms such that they can achieve minimal resource usage in the OSEK OS implementation. In this paper, we analyze the task subsystem, resource subsystem, application mode and conformance classes of OSEK OS as well as the OSEK Implementation Language (OIL). Based on our analysis, we in turn devise and implement kernel mechanisms to minimize the dynamic memory usage of the OSEK OS implementation. Finally, we show that our mechanisms effectively reduce the memory usage of OSEK OS and applications.

• 한국생산제조학회지
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• 제18권6호
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• pp.551-557
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• 2009

A development of smart materials is becoming a prominent issue on present industries. A smart material, included in functions, is needed for micro fabrication. A shape memory alloy(SMA) in a smart material is best known material. Ni-Ti alloy, composed of nikel and titanium is one of the best shape memory alloy(SMA). Nitinol SMA is used for a lot of high tech industry such as aero space, medical device, micro actuator, sensor system. However, Ni-Ti SMA is difficult to process to make a shape and fabrications as traditional machining process. Because nitinol SMA, that is contained nikel content more than titanium content, has similar physical characteristics of titanium. In this paper, the characteristics of ECM grooving process for nitinol SMA are investigated by experiments. The experiments in this study are progressed for power, gap distance and machining time. The characteristics are found each part. Fine shape in work piece can be found on conditions; current 6A, duty factor 50%, gap distance 15%, gap distance $15{\mu}m$, machining time 10min.

• 대한안전경영과학회지
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• 제19권2호
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• pp.147-157
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• 2017

The tourism experience factor is an essential source of competitive advantage in the tourism industry and is an important factor for predicting future tourism behavior. Tourism experience elements can be composed of areas of education, entertainment, aesthetics and deviance (Pine and Gilmore, 1998). This study examines the effect of tourist experience factors on tourist loyalty and it is meaningful to see if the experiential economic theory of Pine and Gilmore (1999) is applicable. In order to achieve the purpose of this study, we conducted a questionnaire survey on tourists using experiential tourism factors. As a result, it was found that recreational experiential factors had a significant effect on memory. Memory has a significant effect on both visitor satisfaction and tourist loyalty. This study has academic significance because it focuses on the tourism experience factor which is the core of experiential economic theory. Practical significance is that a lot of experiential contents should be found in order to better match the tourist experience factor to the requirements of visitors to the tourist site. As a result, it is expected to generate revenue and improve its competitiveness.

• 한국엔터테인먼트산업학회논문지
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• 제13권5호
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• pp.247-262
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• 2019

본 연구는 가정방문 인지자극 활동이 치매특별등급(5등급) 노인의 인지기능 및 기억 자기효능감에 미치는 효과를 알아보고자 하였다. 연구기간 및 대상은 2019년 2월 11일부터 4월 26일까지 G광역시에 거주하는 65세 여성 1명으로, 개별대상연구의 A-B-A' 설계를 사용하였다. 초기 진단을 받은 치매특별등급(5등급)의 경증치매 노인에게 비교적 접근성이 쉽고, 스스로 생각하고 풀어갈 수 있는 수준의 신체·인지자극 활동을 병행함으로써 지적능력을 반복적으로 자극하여 저하된 인지기능을 완화시켰고, 일상생활에서 친숙한 글자, 숫자, 신체 움직임 등을 이용한 단기기억 및 회상 활동을 지속적으로 훈련함으로써 저하된 기억력과 집중력의 인지기능에 긍정적 영향을 미쳤다. 이는 인지자극 활동이 초기 경증치매 노인들에게 센터, 복지관 등의 특정장소를 벗어나 가정에서 손쉽게 접근 가능한 치매예방프로그램임을 확인하였다. 따라서 본 연구의 인지자극 활동은 치매특별등급(5등급) 노인의 인지기능 및 두드러지는 기억저하에 긍정적 영향을 미칠 수 있는 효과적 중재로의 가능성을 확인하였기에, 적극적인 실용 방안을 제안하는 바이다.