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.

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.

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

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.

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.

소방특별사법경찰제도의 운영 근거 및 전문성 강화방안

이재욱,Lee Jae Wook 국제문화기술진흥원 2024 The Journal of the Convergence on Culture Technolo Vol.10 No.3

특별사법경찰은 일반경찰이 수사하기 어려운 전문성이 요구되는 분야에 수사권을 행사하고 있다. 소방특별사법경찰도 이와 마찬가지고 소방사범이라는 전문적인 분야의 수사를 하기 때문에 소방분야의 전문성뿐만 아니라 수사에 관해서도 전문적인 역량을 필요로 한다. 이를 위해서는 우수한 수사인력을 확보할 수 있도록 소방특별사법경찰의 선발과정에 대한 개선이 있어야 하며, 선발된 수사인력을 체계적으로 교육시켜 전문성을 강화할 수 있는 교육시설, 교육내용 등이 부족하므로 이에 대한 개선도 이루어져야 한다. 소방특별사법경찰을 둘러싸고 논란이 되고 있는 부분에 대한 법률을 정비하고, 열악한 수사여건을 개선하여 소방특별사법경찰이 그 역할을 제대로 수행할 수 있도록 하여야 한다. Special judicial police officer are exercising their right to investigate areas that require expertise that is difficult for ordinary police to investigate. The fire special judicial policer are also like this, and since they investigate the specialized field of fire offenders, they require not only expertise in the firefighting field but also professional capabilities in the investigation. To achieve this, there must be improvements in the selection process for fire and special judicial police officers to secure excellent investigative personnel. There is a lack of educational facilities and training content that can systematically educate selected investigative personnel and strengthen their expertise, so improvements are needed. must also be done. Laws on controversial areas surrounding the fire and special judicial police must be reorganized and poor investigative conditions must be improved so that the fire and special judicial policer can properly perform their role.

태음인(太陰人) 위완한증(胃脘寒證)으로 오인한 청심연자탕증(心蓮子湯證) 환자 치험1례

이재욱,허한솔,조혜원,임은철,Lee, Jae-Wook,Hur, Han-Sol,Cho, Hey-Won,Lim, Eun-Chul 사상체질의학회 2017 사상체질의학회지 Vol.29 No.1

Objectives It is important to decide if the patient is belong to cold syndrome or heat syndrome in Sasang Constitutional Medicine. The purpose of this study is to report some proof to determine cold and heat syndrome and characteristic of the patient who can be treated with Cheongsimyeonja-tang. Methods To evaluate the results of this treatment, muscular symptom was assessed by Visual Analogue Scale(VAS). The patient's general condition such as urinary and fecal discomfort is assessed by the progress notes. Results The patient did not improved when she was treated with Choweseuncheung-tang. But when she was treated with Cheongsimyeonja-tang, she got improved with not only her main problem such as muscular symptom, but also general condition such as indigestion, urinary & fecal discomfort and menopausal symptom. Conclusion This study suggests that number of defecation per day also can be the clue to decide heat or cold syndrome not only appearance of defecation. And the patients who can be treated by Cheongsimyeonja-tang is different from the patients who can be treated by Yeoldahansotang in the color of their face, personality and edema.

원인불명의 고열 및 흉수 이후 악화된 폐결핵후유증 소양인환자 치험 1례 보고

이재욱,허한솔,조혜원,임은철,Lee, Jae-Wook,Hur, Han-Sol,Cho, Hey-Won,Lim, Eun-Chul 사상체질의학회 2016 사상체질의학회지 Vol.28 No.2

Objectives It is important to care aftereffects of the tuberculosis such as cough and sputum especially for the old. The purpose of this study is to report a case which showed symptoms improvement after treatment with Hyungbangjihwang-tang.Methods To evaluate the results of this treatment, Decrease of cough and sputum was assessed by Visual Analogue Scale(VAS). The patient`s oral intake and body weight were measured.Results The patient who suffered with cough and sputum after tuberculosis developed high fever and pleural effusion of unknown origin. After treatment with western and oriental medicine, high fever and pleural effusion were subsided but cough and sputum got worse and body weight was decreased after high fever and pleural effusion. So we prescribed Hyungbangjihwang-tang and then the symptoms of the patient were improved.Conclusions This study suggests that using Sasang constitutuional medical treatment is effective for Soyangin patient with afftereffects of the tuberculosis such as cough and sputum.

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.