• 정보저장시스템학회논문집
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• 제1권1호
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• pp.84-92
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• 2005

This work presents the feasibility of shunt damping far vibration suppression of the rotating HDD disk-spindle system using piezoelectric bimorph. A target vibration mode which significantly restricts the recording density increment of the drive is determined through modal analysis and a piezoelectric bimorph is designed to suppress unwanted vibration. After deriving the two-dimensional generalized electromechanical coupling coefficient of the shunted drive, the shunt damping of the system is predicted by simulating the displacement transmissibility using the coefficient. In addition, optimal design process using sensitivity analysis is undertaken in order to improve the shunt damping of the system. The effectiveness of the proposed methodology is verified through experimental implementation by observing the vibration characteristics of the rotating disk-spindle system in frequency domain.

• 한국컴퓨터정보학회논문지
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• 제21권1호
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• pp.9-16
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• 2016

In this paper, we present a performance evaluation agent based on fuzzy cluster analysis and validity measures. The proposed agent is consists of three modules, fuzzy cluster analyzer, performance evaluation measures, and feature ranking algorithm for feature selection step in CAD system. Feature selection is an important step commonly used to create more accurate system to help human experts. Through this agent, we get the feature ranking on the dataset of mass and calcification lesions extracted from the public real world mammogram database DDSM. Also we design a CAD system incorporating the agent and apply five different feature combinations to the system. Experimental results proposed approach has higher classification accuracy and shows the feasibility as a diagnosis supporting tool.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2005년도 공동추계학술대회
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• pp.359-368
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• 2005

Personalized reminder systems have to identify the user's current needs dynamically and proactively based on the user's current context. However, need identification methodologies and their feasible architectures for personalized reminder systems have been so far rare. Hence, this paper aims to propose a proactive need awaring mechanism by applying agent, semantic web technologies and RFID-based context subsystem for a personalized reminder system, which is one of the supporting systems for a robust ubiquitous service support environment. Rescorla-Wagner model is adopted as an underlying need awaring theory. We have created a prototype system. called NAMA(Need Aware Muiti-Agent)-RFID. to demonstrate the feasibility of the methodology and of the mobile settings framework that we propose in this paper Moreover, to test if the proposed system works in terms of scalability, a simulation was performed and the results are described.

• Journal of information and communication convergence engineering
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• 제19권3호
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• pp.175-179
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• 2021

Enhancing the reliability of the system is important for recent system-on-chip (SoC) designs. This importance has led to studies on fault diagnosis and tolerance. Fault-injection (FI) techniques are widely used to measure the fault-tolerance capabilities of resilient systems. FI techniques suffer from limitations in relation to environmental conditions and system features. Moreover, a hardware-based FI can cause permanent damage to the target system, because the actual circuit cannot be restored. Accordingly, we propose a simulation-based FI framework based on the Verilog Procedural Interface for measuring the failure rates of SoCs caused by soft errors. We execute five benchmark programs using an ARM Cortex M0 processor and inject soft errors using the proposed framework. The experiment has a 95% confidence level with a ±2.53% error, and confirms the reliability and feasibility of using proposed framework for fault analysis in SoCs.

• Journal of Information Processing Systems
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• 제12권4호
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• pp.741-753
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• 2016

In the medical fields, many efforts have been made to develop and improve Hospital Information System (HIS) including Electronic Medical Record (EMR), Order Communication System (OCS), and Picture Archiving and Communication System (PACS). However, materials generated and used in medical fields have various types and forms. The current HISs separately store and manage them by different systems, even though they relate to each other and contain redundant data. These systems are not helpful particularly in emergency where medical experts cannot check all of clinical materials in the golden time. Therefore, in this paper, we propose a process to build an integrated data model for medical information currently stored in various HISs. The proposed data model integrates vast information by focusing on medical images since they are most important materials for the diagnosis and treatment. Moreover, the model is disease-specific to consider that medical information and clinical materials including images are different by diseases. Two case studies show the feasibility and the usefulness of our proposed data model by building models about two diseases, acute myocardial infarction (AMI) and ischemic stroke.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권3호
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• pp.1063-1075
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• 2022

In recent years, container techniques have been broadly applied to cloud computing systems to maximize their efficiency, flexibility, and economic feasibility. Concurrently, studies have also been conducted to ensure the security of cloud computing. Among these studies, moving-target defense techniques using the high agility and flexibility of cloud-computing systems are gaining attention. Moving-target defense (MTD) is a technique that prevents various security threats in advance by proactively changing the main attributes of the protected target to confuse the attacker. However, an analysis of existing MTD techniques revealed that, although they are capable of deceiving attackers, MTD techniques have practical limitations when applied to an actual cloud-computing system. These limitations include resource wastage, management complexity caused by additional function implementation and system introduction, and a potential increase in attack complexity. Accordingly, this paper proposes a software-defined MTD system that can flexibly apply and manage existing and future MTD techniques. The proposed software-defined MTD system is designed to correctly define a valid mutation range and cycle for each moving-target technique and monitor system-resource status in a software-defined manner. Consequently, the proposed method can flexibly reflect the requirements of each MTD technique without any additional hardware by using a software-defined approach. Moreover, the increased attack complexity can be resolved by applying multiple MTD techniques.

• 대한공간정보학회지
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• 제1권1호
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• pp.217-225
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• 1993

지형공간정보체계에 대한 투자의 타당성을 조사하는 방법으로 비용효과분석을 하는 경우가 많다. 경제학분야의 비용/효과 분석기법을 일반적인 정보체계도입의 타당성조사에 대해서 많이 활용하여 왔으며 최근 GSIS에 대해서도 적용시키려는 노력이 많이 진행되고 있다. 본 연구에서는 국내 GSIS에 적합한 비용/효과 모델을 확립시키고 이모델을 시설물관리 업무에 적용시켰다. GSIS의 구축에 필요한 비용의 항목을 결정하고 각각의 항목에 필요한 단가를 조사하여 결정하므로서 국내실정에 맞는 비용모형을 제시하였으며 효과모형의 확립에서는 지형공간정보체계를 도입하므로서 얻을 수 있는 효과를 특성에 따라 분류하였으며 분류된 항목 중 정량화 가능한 항목을 세부적으로 분류하였다. 확립된 비용/효과 모형을 국내의 대규모의 도시가스공금 업체에 적용시켜 100명 이상의 직원수와 300,000 가구이상의 수용가를 관리하는데 필요한 GSIS를 설계하였으며 이러한 GSIS를 구축할 때의 비용과 GSIS의 도입 없이 수동식으로 운영하는 비용을 계산하여 비교하였다.

• 경영정보학연구
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• 제5권1호
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• pp.129-146
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• 2003

기술 투자와 거래의 증가는 기술가치 평가에 대한 관심을 증대시키고 있으나 평가의 전문성과 기술가치의 다양성으로 인해 객관적인 기술 가치 평가가 용이하지 않은 문제점을 가지고 있다. 이 연구는 웹 기반의 대화형 기술가치 평가(WITV) 시스템을 개발하고 이 시스템을 이용한 기술가치의 평가 및 기술가치의 전략 분석에 그 목적을 두고 있다. WITV 시스템은 내적 기술가치(IVT)와 외적 기술가치(EVT)로 구성 된 기술가치 매력도(TVA) 모형을 이용하여 기술가치를 평가하고 해당 산업에서 기술의 가치를 제고하기 위한 전략을 분석하는데 이용되고 있다. 이 연구는 코스닥에 등록된 IT산업 의 중소 제조기업을 대상으로 TVA 모형과 WITV 시스템의 타당성과 적용가능성을 실험하였으며, 실험결과에 의해 그 효용성을 검증하였다.

• Agribusiness and Information Management
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• 제2권1호
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• pp.89-102
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• 2010

Discussion in this article will center around introducing RFID/USN technology and exploring feasibility of applying the technology to agricultural area, based on actual pilot project done at the fisheries in Jeju Province, South Korea. The case in this article will suggest some factors needed to consider in applying RFID/USN system to the agricultural business.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(1)
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• pp.351-354
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• 2002

NAPTR(Naming Authority Pointer) is a type of resource record specified IETF RFC 2915. NAPTR enables to register various services in tile domain name systems and thus Provides a way to discover services available on specific hosts. This paper describes the design and implementation of a proxy DNS system aimed at supporting NAPTRS. The goal of this work is to study on the feasibility of the service discovery registered in DNS via NAPTR records. This research result can be applied to service discovery in the resource information management for high performance GRID environments as well as to implement generic ENUM services