• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.23 no.3
• /
• pp.266-272
• /
• 2014

This study proposes a closed-loop shaping control method with $H_{\infty}$ optimization for optical image stabilization (OIS) in mobile phone cameras. The image stabilizer is composed of a horizontal stage constrained by ball bearings and actuated by the magnetic force from voice coil motors. The displacement of the stage is measured by Hall effect sensors. From the OIS frequency response experiment, the transfer function models of the stage and Hall effect sensor were identified. The weight functions were determined considering the tracking performance, noise attenuation, and stability with considerable margins. The $H_{\infty}$ optimal controller was executed using closed-loop shaping and limiting the controller order, which should be less than 6 for real-time implementation. The control algorithm was verified experimentally and proved to operate as designed.

• Proceedings of the KIEE Conference
• /
• 1998.07b
• /
• pp.778-780
• /
• 1998

The distributied control system consists of PCS(Process Control System), OIS(Operator Interface System), Communication Network and EWS(Engineering Workstation). This parer describes the system structures and the technological trends of domestically developed distributied control system (DCS).

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.46 no.9
• /
• pp.25-32
• /
• 2009

Recently, research for Network-on-chip(NoC) is progressing. However, due to the increase of system complexity and demand on high performance, conventional copper-based electrical interconnect would be faced with the design limitation of performance, power, and bandwidth. As an alternative to these problems, combined use of Electrical Interconnects(EIs) and Optical Interconnects(OIs) has been introduced. In this paper we propose efficient routing optimization strategy and hybrid switch architecture, which use OIs for critical path and EIs for non-critical path. The proposed method shows up to 25% performance improvement and 38% power reduction.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2013.08a
• /
• pp.104.2-104.2
• /
• 2013

A residual gas analyzer (RGA) system has been developed in this laboratory. Characteristics of the RGA system parts such as ion source, quadrupole mass filter and sensitivity are introduced. Some efforts have been made to improve performance of the two types of ion sources, open ion source (OIS) and closed ion source (CIS). A metal mesh was placed onto the electron beam entrance of the CIS anode tube to block the filament field penetration. Sensitivity of the CIS ion sources with and without the mesh was compared by mass spectra of SF6 gas (97% He base) introduced into the CIS anode through a needle valve. About ten-times improvement in the RGA sensitivity was observed for the CIS with the mesh in the electron entrance. Computer simulation showed an axi-symmetric anode potential distribution and improved focusing of the electron beam inside the anode tube with the mesh.

• Journal of the Korean Society for Railway
• /
• v.11 no.3
• /
• pp.286-293
• /
• 2008

In this paper, u-FOS system is applied to field test in order to design the code structure based on standards and both 900MHz passive and 2.45GHz active RFID devices were used to test identification capacity in the field tests. For the stable RFID data obtainments, optimum speed of trucks and rail cars and most suitable tagging locations on them were resulted from field tests. The data obtained from ground logistics base and identified through the system is sent to u-FOS. Because the code structure is designed in the form of KKR code structure, this system can be implemented on RFID ODS network without difficulty. Therefore, we suggested the result as a guideline for corporations and government agencies to easily adopt the system.

• Proceedings of the Korea Multimedia Society Conference
• /
• 1998.10a
• /
• pp.407-412
• /
• 1998

21세기는 고도의 정보화 사회가 될 것이다. 이러한 정보화의 사회의 가장 중요한 요소는 수많은 문서 정보를 전자 문서로 만들고 관리하는 것인데, 최근 들어 OIS(Office Information System), 디지털 도서관, CALS/EC 등의 다양한 응용 분야에서 일한 전자 문서의 저장, 처리, 검색이 요구되고 있다. 이러한 상황에서 다양한 전자 문서의 표준들이 나오고 있고, 그 중 차세대 전자 문서의 표준의 선두로서 XML이 대두되고 있다. 따라서 최근에는 XML 문서를 저장하고 검색하는 다양한 응용들이 개발중이고, 이러한 응용들은 XML 문서의 다양한 문서 정보를 모두 만족할 수 있는 검색 기능들을 요구하고 있다. 본 논문에서는 이러한 다양한 XML 응용들의 요구에 따라서 XML 문서가 지닌 다양한 문서 정보에 대해서 검색할 수 있는 XML 질의 언어의 개발에 목적이 있다.

• Transactions of the Society of Information Storage Systems
• /
• v.7 no.2
• /
• pp.70-74
• /
• 2011

The mobile camera module is a device to be inserted in the digital device for camera feature. The mobile camera module is being shaken by vibrations such as handshake during the exposure time. The clarity is compromised by these vibrations, thus the vibration is considered as an external disturbance. Moreover the use of mobile camera module has been being expanded for automotive vibration should be considered. These external disturbances can cause image blurring, thus optical image stabilization should be applied for image compensation. The compensator is fulfilled mechanically by movable lens group or image sensor that adjusts the optical path to the camera movement. Open loop control is useful for well-defined systems like compliant mechanism. Notch filter and lead compensator are designed and applied to improve the stability and bandwidth. The final level of image compensating is confirmed by image processing with MATLAB and CODE V to verify the better performance.

• Cross-Cultural Studies
• /
• v.39
• /
• pp.7-32
• /
• 2015

In 1950, Anne $H{\acute{e}}bert$ published Le Torrent, a collection of seven short stories. These stories containing many shocking themes and expressions have placed her one of the pioneers of modern novels in Quebec. This paper tries to analyze several phases of alienation described in the novels and the reactions of alienated caracters in their situation. Some examples of alienated and mentally or physically deformed characters in Le Torrent are Fran?ois, $St{\acute{e}}phanie$, Stella, etc. Although the author wanted readers to interpret these characters on ther individual level, this paper interprets them differently. The result of this study is as following. Alienation doesn't come from one's interior but his exterior. Society and history are major agents of alienation. The injustice of life imposed on the caracters results from political and religious underdevelopment, cultural lowness, absence of social security system and of universal education at that time. The conquest of Quebec by England left a deep and historical wound on the French Canadians. This fact is, in my opinion, one of the essential themes of Anne $H{\acute{e}}bert^{\prime}s$ novels. In spite of all these alienating situations, the reactions showed by the caracters of the novels are limited to escapist illusion, self-destruction, mistaken revenge, eternal submission, etc. In conclusion, Le Torrent by Anne $H{\acute{e}}bert$ which deeply approached themes of violence and alienation could be called authentic landscape of the inner world of Quebecois before 'la Revolution tranquille.'

• Journal of Korean Society of Archives and Records Management
• /
• v.21 no.1
• /
• pp.211-230
• /
• 2021

This study aims to design folk song metadata based on the OAIS reference model for the folk songs' preservation and permanent use. Thus, the folk songs' general characteristics were investigated by researching literature and related technical standards. The type of records, the methods and standards for long-term storage of records, OAIS reference models, and each package's metadata elements were identified through opinions from the popular songs' creators and researchers. The results awere that first, folk songs were created for social transformation, serving as a cultural heritage different from popular songs given their noncommercial quality. Second, the types of folk song records were identified, and the long-term preservation system suitable for the types of records was based on the OAIS reference model. Third, the metadata were edited, and the OIS reference model was applied such that respect was given to the folk songs' characteristics, context, and original order. Fourth and last, information package metadata elements matching the folk songs' records were derived and applied to the representative Korean folk song, "The March for Being."

• Journal of the Korean Society of Radiology
• /
• v.3 no.3
• /
• pp.5-11
• /
• 2009

When using Image Guided Radiation Therapy, the patient is placed using skin marker first and after confirming anatomical location using OBI, the couch is moved to correct the set up. Evaluation for the error made at that moment was done. Through comparing $0^{\circ}$ and $270^{\circ}$ direction DRR image and OBI image with 2D-2D matching when therapy planning, comparison between patient's therapy plan setup and actual treatment setup was made to observe the error. Treatment confirmation on important organs such as head, neck and spinal cord was done every time through OBI setup and other organs such as chest, abdomen and pelvis was done 2 ~ 3 times a week. But corrections were all recorded on OIS so that evaluation on accuracy could be made through using skin index which was divided into head, neck, chest and abdomen-pelvis on 160 patients. Average setup error for head and neck patient on each AP, SI, RL direction was $0.2{\pm}0.2cm$, $-0.1{\pm}0.1cm$, $-0.2{\pm}0.0cm$, chest patient was $-0.5{\pm}0.1cm$, $0.3{\pm}0.3cm$, $0.4{\pm}0.2cm$, and abdomen was $0.4{\pm}0.4cm$, $-0.5{\pm}0.1cm$, $-0.4{\pm}0.1cm$. In case of pelvis, it was $0.5{\pm}0.3cm$, $0.8{\pm}0.4cm$, $-0.3{\pm}0.2cm$. In rigid body parts such as head and neck showed lesser setup error compared to chest and abdomen. Error was greater on chest in horizontal axis and in AP direction, abdomen-pelvis showed greater error. Error was greater on chest in horizontal axis because of the curve in patient's body when the setup is made. Error was greater on abdomen in AP direction because of the change in front and back location due to breathing of patient. There was no systematic error on patient setup system. Since OBI confirms the anatomical location, when focus is located on the skin, it is more precise to use skin marker to setup. When compared with 3D-3D conformation, although 2D-2D conformation can't find out the rolling error, it has lesser radiation exposure and shorter setup confirmation time. Therefore, on actual clinic, 2D-2D conformation is more appropriate.