스트리밍 프레임워크와 멀티미디어 데이타베이스와의 연동기법

이재욱,이승룡,이종원,Lee, Jae-Wook,Lee, Sung-Young,Lee, Jong-Won 한국정보과학회 2002 정보과학회논문지 : 소프트웨어 및 응용 Vol.29 No.7

본 논문은 실시간 멀티미디어 스트리밍 프레임워크과 멀티미디어 데이타베이스의 연동 모듈인 데이타베이스 커넥터를 소개한다. 스트리밍 시스템과 멀티미디어 데이타베이스를 연동하는 경우 스트리밍 중에도 재생중인 미디어에 관련된 정보들을 데이타베이스로부터 검색 및 재결합이 가능하여 다양한 멀티 미디어 데이타베이스 서비스를 제공받을 수 있다. 그러나, 현재 스트리밍 시스템과 데이타베이스와의 연동은 파일 시스템으로 구현되거나, 파일형태의 스트리밍 데이타와 컨텐츠를 다루는 메타 데이타가 분리되어 관리되는 관계형 데이타베이스에 국한되어 있어 다양한 멀티미디어 서비스를 제공하기에 부적합하다. 이런 제약점을 보완하기 위하여 본 논문에서는 스트리밍 프레임워크와 멀티미디어 데이타베이스가 동일한 호스트에 존재한다는 가정 하에 작동되는 IPC 기반의 데이타 베이스 커넥터를 제안한다. 제안된 데이터베이스 커넥터는 데이타베이스 기능을 사용할 수 있도록 읽기, 쓰기, 찾기, 재생 트랜잭션과, 트랜잭션 처리를 위한 인터페이스를 정의하였고, IPC 인터페이스 모듈을 플러그인 형태로 구현하여 본 논문에서 적용한 BeeHive와의 연동뿐 아니라 다른 다양한 멀티미디어 데이타베이스와 연동 시 바로 적용시킬 수 있는 확장성을 가지고 있다. 성능 분석 결과 제안된 IPC 기반 연동기법은 기존의 파일 방식의 연동기법과 비교하여 성능의 저하가 크지 않았다. This paper describes on our experience of developing the Database Connector as an interconnection method between multimedia database, and the streaming framework. It is possible to support diverse and mature multimedia database services such as retrieval and join operation during the streaming if an interconnection method is provided in between streaming system and multimedia databases. The currently available interconnection schemes, however have mainly used the file systems or the relational databases that are Implemented with separated form of meta data, which deafs with information of multimedia contents, and streaming data which deals with multimedia data itself. Consequently, existing interconnection mechanisms could not come up with many virtues of multimedia database services during the streaming operation. In order to resolve these drawbacks, we propose a novel scheme for an interconnection between streaming framework and multimedia database, called the Inter-Process Communication (IPC) based Database connector, under the assumption that two systems are located in a same host. We define four transaction primitives; Read, Write, Find, Play, as well as define the interface for transactions that are implemented based on the plug-in, which in consequence can extend to other multimedia databases that will come for some later years. Our simulation study show that performance of the proposed IPC based interconnection scheme is not much far behind compared with that of file systems.

Al-20Si-5.5Fe-1.2Mg-0.5Mn 합금분말의 치밀화에 미치는 소결온도와 분위기의 영향

이재욱,박상빈,양상선,김용진,Lee, Jae-Wook,Park, Sang-Bin,Yang, Sang-Sun,Kim, Yong-Jin 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.3

The densification behavior of Al-20Si-5.5Fe-1.2Mg-0.5Mn powders was investigated through micro-structure analysis of sintered specimens. The specimens sintered in vacuum or in high purity (99.999%) nitrogen showed porous near-surface microstructures. The densification of near-surface part was enhanced by means of ultra-high purity (99.9999%) nitrogen atmosphere. The relationship between slow densification and oxide surfaces of Al alloy powders was discussed. And the effects of Mg addition, nitrogen gas, and humidity on densification were discussed. In addition, the rapid growth of primary Si crystals above the critical temperature was reported.

[2]Pseudorotaxanes Containing the Tertiary Alkylammonium Salts as Strings and Cucurbit[6]uril as a Bead

이재욱,임귀택,Lee, Jae-Wook,Lim, Gui-Taek Korean Chemical Society 2005 대한화학회지 Vol.49 No.1

비정질 $Al_2O_3$ 코아 재료를 이용한 Solenoid 형태의 고품질 RF chip 인덕터에 관한 연구

이재욱,정영창,윤의중,홍철호,Lee, Jae-Wook,Jung, Young-Chang,Yun, Eui-Jung,Hong, Chol-Ho 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.6

우수한 성능을 가지며 소형${\cdot}$경량인 무선통신기기를 구현하기 위해서는 GHz 대의 고주파수에서 동작하는 소형 RF chip 인덕터의 개발은 중요한 연구분야가 되어왔다. 또한 최근 많이 사용되는 자성 ferrite core 재료는 300MHz 이상의 주파수영역에서 자화율이 급속하게 감소하여 고성능 RF chip 인덕터 개발에 큰 장애가 되고 있다. 따라서 본 논문에서는 비정질 $Al_2O_3$ 코아 재료를 응용한 단순 solenoid 형태의 소형${\cdot}$고성능 RF chip 인덕터를 연구하였다. Cu를 코일 (직경=40${\mu}m$)로 사용하였고 인덕터 크기는 $2.1mm{\times}1.5mm{\times}1.0mm$였다. 외부 전류원은 코일의 양단을 코아 가장자리에 적층된 Au 막에 본딩시킨 후 인가되었다. 코아의 성분은 EDX를 사용하여 분석하였다 개발된 인덕터의 인덕턴스 (L), quality factor (Q), 인피던스(Z)등의 주파수 특성은 RF impedance/Material Analyzer (HP16193A test fixture가 장착된 HP4291B)로 측정되었다. 인덕터들의 인덕턴스 값은 22 nH ~ 150 nH 범위를 가지며, 이들의 자기공진주파수 (SRF)는 1~3.5GHz 영역을 나타낸다. 또한 자기공진주파수가 증가함에 따라 인덕턴스 값이 감소하는 경향을 보이고 있다. 임피던스는 공진주파수에서 최대 값을 가지며 Q-factor의 값은 500 MHz ~ 1.5 GHz 주파수 범위에서 최대 70~97까지 얻어졌다. Recently, there is a growing need to develope small-size RF chip inductors operating to GHz to realize high-performance, micro-fabricated wireless communication products. For the development of high-performance RF chip inductors, however, the ferrite-based chip inductors can not be used above 300MHz due to the limitation of the permeability of this material. In this work, small-size, high-performance RF chip inductors utilizing amorphous $Al_2O_3$ core material were investigated. Copper (Cu) with 40${\mu}m$ diameter was used as the coils and the chip inductor size fabricated in this work is $2.1mm{\times}1.5mm{\times}1.0mm$. The external current source was applied after bonding Cu coil leads to gold pads electro-plated on the bottom edges of a core material. The composition of core materials was measured using a EDX. High frequency characteristics of the inductance (L), quality factor (Q), and impedance (Z) of developed inductors were measured using an RF Impedance/Material Analyzer (HP4291B with HP16193A test fixture). The developed inductors have the self-resonant frequency (SRF) of 1 to 3.5 GHz and exhibit L of 22 to 150 nH. The L of the inductors decreases with increasing the SRF. The Z of the inductors has the maximum value at the SRF and the inductors have the quality factor of 70 to 97 in the frequency range of 500 MHz to 1.5 GHz.

대사증후군의 습담 변증군과 심박변이도의 관련성에 관한 고찰

이재욱,신윤리,배수현,박선영,최상옥,김경민,김영균,Lee, Jae-Wook,Shin, Yoon-Ri,Bae, Su-Hyun,Park, Seon-Young,Choi, Sang-Ok,Kim, Kyoung-Min,Kim, Young-Kyun 대한한방내과학회 2012 大韓韓方內科學會誌 Vol.33 No.3

Objectives : This study was performed to investigate characteristic indice of heart rate variability (HRV) according to presence of metabolic syndrome (MS), pattern identification. Methods : We analyzed 167 subjects who participated in a stroke check-up. We classified the subjects into two groups as MS (n=48) and non-MS (n=119) based on NCEP ATP III. First, we investigated pattern identification of all subjects based on Korean Standard Pattern Identifications for Stroke-III. Second, we surveyed significance of HRV indices between MS and non-MS groups. Third, we investigated significance of HRV indices between classified DP of MS and classified DP of non-MS. Fourth, we investigated significance of HRV indices between classified DP of MS and non-MS. Fifth, we investigated significance between components of MS and HRV indices. Results : 1. SDNN, RMS-SD, HF, Ln(HF), and HF (NORM) were significantly lower in the MS than non-MS group. LN (TP), LF/HF were significantly higher in the MS than non-MS. 2. Ln (HF), Ln (TP), and LF/HF were statistically significant in the classified DP of MS group. 3. RMS-SD, and Ln (HF) were significantly lower in the abdominal obesity group than in the non-abdominal obesity group. SDNN, RMS-SD, TP, Ln (TP), VLF, Ln (VLF), and Ln (LF) were significantly lower in the hypertension group than in the non-hypertension group. RMS-SD was significantly lower in the diabetes group than in the non-diabetes group. Mean HRT,LF/HF were significantly higher in the hypertriglyceridemia than non-hypertriglyceridemia group, but Ln (HF), RMS-SD, and HF (NORM) were significantly lower in the hypertriglyceridemia than non-hypertriglyceridemia group. Conclusions : We found a few significant relationships between classified DP of MS and HRV indices. The resluts demonstrate that MS has potentially negative effects on the cardiovascular system, and these effects could be detected by HRV.

알루미늄 분말야금부품의 기술동향

이재욱,양상선,김용진,Lee, Jae-Wook,Yang, Sang-Sun,Kim, Yong-Jin 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.6

알루미늄 분말야금부품은 철계 분말부품에 비해 가볍고 알루미늄 주조부품에 비해 우수한 기계적 물성을 갖는다. 단, 상대적으로 비싼 가격이 이 부품의 응용을 제약하는 장벽이었으나 최근의 환경과 에너지 문제에 대한 세계적인 관심은 이를 극복할 수 있는 계기를 제공하고 있다. 선진국은 이미 일본을 중심으로 1990년대부터 알루미늄 분말부품에 대한 기술개발을 진행하였고 현재는 다양한 상용 부품을 판매하고 있으며 조만간 그 판매량이 크게 증가할 것으로 예상된다. 이에 이 글에서는 국내 관련 연구자들의 이해를 돕고자 알루미늄 분말야금부품의 국내외 기술개발 동향, 특허 동향, 원재료 동향 등을 분석하여 소개한다.

나노 구조를 가지는 다공성 주석 산화물의 전기화학적 특성

이재욱,박수진,신헌철,Lee, Jae-Wook,Park, Su-Jin,Shin, Heon-Cheol 한국재료학회 2011 한국재료학회지 Vol.21 No.1

A nano-porous structure of tin oxide was prepared using an anodic oxidation process and the sample's electrochemical properties were evaluated for application as an anode in a rechargeable lithium battery. Microscopic images of the as-anodized sample indicated that it has a nano-porous structure with an average pore size of several tens of nanometers and a pore wall size of about 10 nanometers; the structural/compositional analyses proved that it is amorphous stannous oxide (SnO). The powder form of the as-anodized specimen was satisfactorily lithiated and delithiated as the anode in a lithium battery. Furthermore, it showed high initial reversible capacity and superior rate performance when compared to previous fabrication attempts. Its excellent electrode performance is probably due to the effective alleviation of strain arising from a cycling-induced large volume change and the short diffusion length of lithium through the nano-structured sample. To further enhance the rate performance, the attempt was made to create porous tin oxide film on copper substrate by anodizing the electrodeposited tin. Nevertheless, the full anodization of tin film on a copper substrate led to the mechanical disintegration of the anodic tin oxide, due most likely to the vigorous gas evolution and the surface oxidation of copper substrate. The adhesion of anodic tin oxide to the substrate, together with the initial reversibility and cycling stability, needs to be further improved for its application to high-power electrode materials in lithium batteries.

7-[(3-메틸티오 또는 3-메틸티오메틸)-3-피롤리닐]퀴놀론-3-카르복실산의 합성과 항균작용

이재욱,손호정,이규삼,유영효,김대영,Lee, Jae-Wook,Son, Ho-Jung,Lee, Kyu-Sam,Yu, Young-Hyo,Kim, Dae-Young 대한약학회 1994 약학회지 Vol.38 No.5

A number of 7-[(3-methylthio or methylthiomethyl)-3-pyrrolinyl] quinolone-3-carboxylic acids were synthesised by condensation of 7-fluoro substituted quinolone-3-carboxylic acid with 3-methylthio-3-pyrroline or 3-methylthiomethyl-3-pyrroline. The in vitro antimicrobial activity of them were tested against twenty species of Gram-positive or Gram-negative microorganisms. It showed remarkable antibacterial activity, particularly against Gram-positive microoganisms. Among those 1-cyclopropyl-6,8-difluoro-7-[(3-methylthiomethyl) -3-pyrrolinyl]-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid(12a) and 1-cycl opropyl-6-fluoro-8-chlore-7-[(3-methylthiomethyl)-3-pyrrolinly]-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid(12b) showed the most potent in vitro antibacterial activity.

Syntheses and Antibacterial Activities of 7-(5-Methylthio-2,7-diazabicyclo[3.3.0]oct-7-yl)quinolone-3-carboxylic Acids

이재욱,임귀택,이길성,Jae Wook Lee,Gui Taek Lim,Kilsung Lee Korean Chemical Society 2003 대한화학회지 Vol.47 No.5

법과 제도적 관점에서 본 소방특별조사의 개선방안

이재욱,정기성,Lee, Jae Wook,Jeong, Gi Sung 국제문화기술진흥원 2021 The Journal of the Convergence on Culture Technolo Vol.7 No.3

2011년 8월 4일에 개정된 법률에 따라 소방특별조사는 소방시설의 유지·관리 등을 관계인(소유자·관리자·점유자)이 하고 이에 대한 책임도 관계인에게 주어졌다. 소방특별조사는 기존의 모든 소방대상물에 직접 출입하여 소방시설의 유지·관리 상태 등을 조사하는 대신에 매년 일부 대상물을 선별하여 방문하고 소방시설의 유지·관리 상태 등을 확인하고 잘못된 부분에 대하여 시정하고 그 책임에 대하여 과태료 등의 처분을 하는 것이다. 이 제도를 도입한 이유가 관계자의 책임을 강화하여 민간자율정정제도의 정착, 소방전문 인력의 부족, 빈번한 대민접촉에 따른 부패의 개연성과 소방검사에 따른 소방기관의 책임 등이 고려되었다. 그러나 소방특별조사제도를 도입하여서도 여러 가지 문제가 대두되고 있다. 소방안전을 위한 제도 중 하나인 소방특별조사는 관계 법령에 따라 소방대상물에 설치된 소방시설에 대하여 적합하게 설치·유지·관리되고 있는지를 관계 공무원, 특히 소방공무원이 확인하는 것이다. 소방특별조사는 1958년 소방법이 제정된 당시에 소방검사로 도입되어 최근까지 30여 차례의 개정과정을 거쳐, 현행 소방특별조사는 2003년 기존의 소방법체계가 4개의 법률로 분법화되면서 "화재예방, 소방시설 설치·유지 및 안전관리에 관한 법률"로 기존의 소방검사 소방특별조사로 변경되어 수용되었다. Under the Act amended on August 4, 2011, a special fire-fighting investigation was conducted by the relevant person (owner, manager, oil refineries), and the responsibility was also given to the relevant person. Instead of directly entering all existing fire-fighting targets and investigating the maintenance and management status of fire-fighting facilities, the fire-fighting agency selects and visits some targets every year, checks the maintenance and management status of fire-fighting facilities, corrects them, and imposes fines, etc. Reasons for the introduction of the system were the establishment of a private autonomous correction system by strengthening the responsibility of officials, lack of firefighting professionals, possible corruption due to frequent public contact, and responsibility of fire agencies. However, many problems arose even after the introduction of a special fire investigation system. A special fire investigation, one of the fire safety systems, checks whether related public officials and especially fire officials are properly installed, maintained and managed in accordance with relevant laws. Special firefighting investigations were introduced as firefighting inspections at the time the firefighting law was enacted in 1958, and have undergone a revised process more than 30 times until recently. Firefighting Facility Installation, Maintenance and Safety Management Act", the existing firefighting inspection was changed to a special firefighting investigation and accepted. At the time of enactment of the Fire Service Act in 1958, a special firefighting investigation was introduced as a firefighting inspection, and until recently, more than 30 revisions have been made. In 2003, as the existing fire fighting system was divided into four laws, it was approved by changing the existing fire fighting inspection to a special fire fighting investigation in the "Fire Fighting Facility Installation, Maintenance and Safety Management Act".