• Journal of the Korean Data and Information Science Society
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• 제24권6호
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• pp.1103-1112
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• 2013

탐색적 자료분석에서는 자료를 통계적 모형에 바로 적합시키기 보다는 자료를 있는 그대로 보려는 데 주안점을 둔다. 우리는 시계열 자료에 대한 그래픽 탐색적 자료분석방법의 하나로서 재현그림을 사용할 수 있다. 재현그림의 장점은 통계모형에 대한 가정 없이 시계열 자료의 구조적 패턴을 확인할 수 있고 이 패턴을 통하여 탐색적으로 시계열 데이터의 구조 변화점을 한 눈에 확인할 수 있다는 데 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2164-2168
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• 2003

Real time control system such as in factory automation fields, defense field, aerospace, railway industries, financial trading and so forth, includes multiple computers on multiple nodes, and share data to process various actions and functions. This is similar to multitasking in a multiprocessor computer system. The task processing efficiency of such system is proportionally increased by process speed of each process computer. And also it is greatly influenced by communication latencies of each node. To provide proper operation of such real time system, a network that can guarantee deterministic exchange of certain amount of data within a limited time is required. Such network is called as a real time network. As for modern distributed control system, the timeliness of data exchange gives important factor for the dynamics of entire control system. In a real time network system, exchanged data are determined by off-line design process to provide the timeliness of data. In other word, designer of network makes up a network data table that describes the specification of data exchanged between control equipments. And by this off-line design result, the network data are exchanged by predetermined schedule. First, this paper explains international standard real time network TCN (Train Communication Network) applied to the KHST (Korean High Speed Train) project. And then it explains the computer program developed for design tool of network data table of TCN.

• 경영과학
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• 제19권1호
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• pp.75-88
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• 2002

In recent years, it Is necessary to develop an alternative measure, the time efficiency of management activities, as a more measurable and operational tool Instead of traditional accounting measures such as inventories turnover. Therefore the concept of throughput time has got much attention as useful tool for controlling time based management. The purpose of this paper is to investigate the usefulness and adaptability of throughput time. The sample consists of 212 non-banking firms listed on the Korean Stock Exchange. The test Period were 10 years(1989-1998). The regression analysis for this study was performed using the cross-sectional data for the sample, and it was also performed for each Industry. The results show that net Income to tonal assets and labor productivity (value added Per employee) variables in the model was signiflcantly associated with throughput time. On the other hand, the relationship between throughput time and logistics cost to sales do largely not have statistical significance. Especially, it is found that the relationship do not have significance or negative response in food & beverage industry and wholesale & retail industry. In summary, the results show that the measure of throughput time can be an effective managerial Indicator for time based competition and management.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2002년도 춘계학술대회 논문집
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• pp.76-81
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• 2002

The characteristics of the track are important concerning the mobility of tracked vehicles. It can be represented in terms of the track tension and maintaining the track tension adequately guarantees the stable and improved driving of the tracked vehicles. The track tension must be known in order to be controlled and it needs to be estimated in real-time because it is difficult to be measured. The tension around idler and sprocket can be controlled by the frizzy logic control system base on the estimated values. Dynamic Track Tensioning System(DTTS) which is estimating and controlling the track tension. In this paper, simulation tool is developed in order to apply the DTTS to real battle tanks. To construct the simulation tool, the Modeling the tracked vehicle, constructing estimation system, and designing controller should be achieved first and then all subsystem should be organized in one. The simulation tool make the RecurDyn model of tracked vehicle, which is plant model, and the control system exchange their data simultaneously. Simulation with many kinds of driving conditions and road conditions is carried out and the results are interpreted. The interpretation provides necessary information to apply the DTTS to real battle tanks.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1061-1066
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• 2004

It is certain that the future manufacturing environment will be network-centric and spatially distributed based on Internet. Today, wide variety of distributed computing and communication technologies are available for implementing a system for product data exchange and sharing. One of the technologies that have been received most attentions for product data exchange and sharing is Product Data Management (PDM). PDM tries to integrate and manage process of data and technical documents that are connected to physical product components. In accordance to previous researches about PDM, it can be regarded as an integration tool of many different areas, which ensures that the right information is available to the right person at the right time and in the right form throughout the enterprise. PDM with Web-enabled CAD system is proposed in this paper in order to acknowledge the usefulness of the system mentioned. The system will use Web service on Visual Studio C#.Net to invoke the web application system.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2004년도 춘계공동학술대회 논문집
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• pp.245-248
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• 2004

It is certain that the future manufacturing environment will be network-centric and spatially distributed based on Internet. Today, wide variety of distributed computing and communication technologies are available for implementing a system for product data exchange and sharing. One of the technologies that have been received most attentions for product data exchange and sharing is Product Data Management (PDM). PDM tries to integrate and manage process of data and technical documents that are connected to physical product components. In accordance to previous researches about PDM, it can be regarded as an integration tool of many different areas, which ensures that the right information is available to the right person at the right time and in the right form throughout the enterprise. PDM with Web-enabled CAD system is proposed in this paper in order to acknowledge the usefulness of the system mentioned. The system will use Web service on Visual Studio C#.Net to invoke the web application system.

• International Journal of Internet, Broadcasting and Communication
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• 제11권3호
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• pp.59-63
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• 2019

VoIP technology is a technology for exchanging voice or video data through IP network. Various protocols are used for this technique, in particular, RTP(Real-time Transport Protocol) protocol is used to exchange voice data. In recent years, with the development of communication technology, there has been an increasing tendency of services such as "Kakao Voice Talk" to exchange voice and video data through IP network. Most of these services provide a service with security guarantee by a user authentication process and an encryption process. However, RTP protocol does not require encryption when transmitting data. Therefore, there is an exposition risk in the voice data using RTP protocol. We will present the risk of the situation where packets are sniffed in VoIP(Voice over IP) communication using RTP protocol. To this end, we configured a VoIP telephone network, applied our own sniffing tool, and analyzed the sniffed packets to show the risk that users' data could be exposed unprotected.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제4권7호
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• pp.277-282
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• 2015

건강정보의 교환, 통합, 공유, 검색의 표준을 개발하는 Health Level Seven(HL7)에서 발표된 표준들은 글로벌한 의료정보 서비스에 성공적으로 사용되고 있다. 그러나 V2.x Message와 V3 Clinical Document Architecture(CDA)는 습득하고 개발하는 데 많은 시간이 소요되는 문제점이 있다. 개선된 Fast Healthcare Interoperability Resources(FHIR)를 사용함으로써 이러한 문제점을 해결할 수 있는 방법인지 모색한다. 개인건강기록이 사회적인 관심을 끌고 있고, 스마트폰 보급률이 급격히 증가하는 점을 반영하여 스마트폰으로 접속 가능한 개인건강기록 프로파일링 시스템을 개발한다. Furore에서 개발한 FHIR Profile editor tools을 통해 profile의 생성, 변경의 개선점을 찾아본다. 이와 같은 시스템을 구축하기 위해서 Electronic Medical Record(EMR) 시스템과 Personal Healthcare Record(PHR) 시스템 간의 정보교류를 FHIR Open API로 구성한다. PHR 프로파일링 시스템에서는 이들 트랜잭션을 RESTful 서비스로 제공한다. 본 연구에서는 FHIR를 통해 PHR 프로파일링 시스템 개발의 효율성을 검증한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.1049-1052
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• 1999

We present a use. interface(UI) simulator for developing a mobile phone. This simulator consists of 3 major modules: Graphic Tool Editor, User Interface Software(UI), and Network Command Processor(NCP). The Graphic Tool Editor can design a virtual mobile terminal. The NCP sends a command to the phone and then receives its status from the phone after completion of the command. We can add or modify lots of features easily to the phone using the UI module. These modules can interact each other by sharing the common area in the memory. By doing so, these modules can exchange their status and data to operate in real-time. We have designed and tested a virtual prototyping phone for the LGP 3200 manufactured by LGIC by using the simulator. Through a series of experiment, we have believed that our virtual prototyping interactive simulator can do shorten its development and testing cycle by applying it in the early design phase.

• Korean Chemical Engineering Research
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• 제52권1호
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• pp.98-105
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• 2014

라이소자임은 용균 작용, 조직 회복 과정의 촉진 등의 작용을 하며 난백 중에 0.3% 함유되어 있다. 난백에서 라이소자임을 분리하는 방법으로 친화성 크로마토그래피, 이온교환크로마토그래피, 한외여과법 등이 있는데 이 중 이온교환크로마토그래피가 가장 많이 사용된다. 라이소자임을 양이온 젤이 충전된 유리 칼럼에서 분리 정제할 때 최적의 pH와 온도 조건을 찾는 것을 실험 목표로 하고, ASPEN Chromatography 전산 모사의 결과와 비교하였다. 실험에 사용되는 완충용액은 인산완충용액이었고 pH를 5~8로 변화를 주어 상온에서 실험하였고, 가장 분리가 잘 이루어진 pH에서 온도를 $5^{\circ}C$ 간격으로 $25{\sim}40^{\circ}C$로 변화시켜 실험하였다. RP-HPLC (Reversed phase High Performance Liquid Chromatography) 분석을 통해 라이소자임의 체류 시간을 확인하였고, OriginPro 8을 이용해 용출 단계에서 크로마토그램의 면적을 비교하여 라이소자임의 양을 정량분석하였다. 결과를 분석한 결과, pH 5일 때, 온도가 $25^{\circ}C$에서 가장 많은 양의 라이소자임이 분리되었다.