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리튬이차전지용 다공성 Si-Ge-Al계 음극활물질의 전기화학적 특성
조충래,김명근,손근용,박원욱,Cho, Chung Rae,Kim, Myeong Geun,Sohn, Keun Yong,Park, Won-Wook 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.1
Silicon alloys are considered promising anode active materials to replace Li-ion batteries by graphite powder, because they have a relatively high capacity of up to 4200 mAh/g, and are environmentally friendly and inexpensive ECO-materials. However, its poor charge/discharge properties, induced by cracking during cycles, constitute their most serious problem as anode electrode. In order to solve these problems, Si-Ge-Al alloys with porous structure are designed as anode alloy powders, to improve cycling stability. The alloys are melt-spun to obtain the rapidly solidified ribbons, and then ball-milled to make fine powders. The powders are etched using 1 M HCl solution, which gives the powders a porous structure by removing the element Al. Subsequently, in this study, the microstructures and the characteristics of the etched powders are evaluated for application as anode materials. As a result, the etched porous powder shows better electrochemical properties than as-milled Si-Ge-Al powder.
디지털홈을 위한 댁내 멀티미디어 분배 표준화 및 기술 동향
조충래,전용일,한상우,이현룡,이동욱,김종원 한국통신학회 2004 정보와 통신 Vol.21 No.8
각 가정으로의 초고속 인터넷이 보편화됨에 따라, 웹 기반의 단순 정보 서비스 및 저해상도 동영상 서비스를 벗어나 지능형 홈 네트워크 및 다양한 멀티미디어 서비스에 대한 관심이 높아지고 있다. 특히 유무선 및 방송$.$통신 융합형 정보통신 환경에서 광대역 멀티미디어 서비스를 고품질로 이용할 수 있는 차세대 통합 네트워크인 광대역통합망(BcN: Broadband convergence Network)이 2010년까지 2천만 가입자에게 제공될 것으로 예상되며, 이를 기반으로 한 디지털 홈네트워킹은 다양한 홈네트워크와 초고속 액세스망을 연결할 것으로 판단된다.(중략)
이영주,유훈,조충래 순천향대학교 1986 논문집 Vol.9 No.2
This retrospective clinical study of 155 cases of twin deliveries were made from Jan. 1, 1796 to Dec. 31, 1985. The results were as follows: 1. The incidence of twin birth was one in 104 births. The frequency of twin births increased with age and parity. 2. Among 155 cases of twin deliveries, the predominant age group was 26-30 with 56.1%. The youngest age was 21 years old woman and the oldest age was 38 years old. 3. Among 155 cases of twin deliveries, nullipara was the most prominent with 53.5% and more than para 3 was only 1.2%. 4. The prominent group in gestational weeks was 37-39 weeks with 465.% and preterm labor occurred in 36.1% of the cases. 5. In fetal presentations of twin, vertex-vertex combination was most common with 49%, and vertex-breech combination was next with 32.9%. 6. The most common mode of twin delivery was spontaneous vertex vaginal delivery with 46.5% and Cesarean section was done in 32.6% of the case. 7. In mean birth weights, the first twin and second twin were 2441.4 gm and 2334.3gm respectively, and first baby was heavier than second one at one minute. 9. In the cases of 50.3%, both babies were male. 10. The most common maternal complication was pregnancy induced hypertension with 45% and followed by preterm labor and anemia. 11. The perinatal mortality rate of the first and second twin was 122 and 154. 12. There was one case of maternal death.
웹서버 로그를 이용한 웹 컨텐츠 사용료 정산 방안 연구
조충래(Chunglae Cho),김용호(Yongho Kim),남기서(Giseo Nam) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅲ
컨텐츠 산업의 증가와 함께 웹을 기반으로 하는 컨텐츠 제공 산업 또한 크게 증가하고 있다. 이에 따라 웹 컨텐츠에 대한 효율적이고 합리적인 사용료 정산 방법이 요구된다. 웹을 기반으로 하는 컨텐츠 서비스의 경우 웹의 특성상 서버와 클라이언트의 연결이 지속되지 않으므로 사용 시간에 따라 사용료를 부과하기가 어렵다. 웹서버의 로그를 이용한 컨텐츠 사용료 부과 방식은 사용자가 사용한 컨텐츠의 질과 량에 따라 사용료를 부과할 수 있는 효과적인 방법이다. 컨텐츠 사용자 정보와 컨텐츠 사용료 부과기준 정보를 이용하여 웹서버의 로그 파일을 분석하여 사용자별 컨텐츠 사용료를 구한다. 웹서버 로그를 이용한 컨텐츠 사용료 정산 방법은 모든 형태의 웹 컨텐츠 제공 시스템에 쉽게 적용할 수 있다.
조충래(Chungnae Cho),최재원(Jaeweon Choi) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
There exists a structural limit of 2WS cars that drivers would not like simultaneously to follow the desired path and attenuate moments resulting from disturbances because lateral acceleration and yaw rate are coupled. In order to overcome the limit, 4WS cars that have rear wheel steering as an additional input are introduced. But 4WS cars have disadvantages that much cost is required due to structural alteration, it is difficult to be used to the driving circumstances and tire performances are not efficient in nonlinear or large lateral acceleration ranges. Therefore, it is proposed that, in this paper, the robust controller is easy to apply to 2WS cars by using direct yaw moment, decouples lateral acceleration from yaw motion and is robust against disturbances and uncertainties of system parameters, and thus the proposed control method has the advantages of 4WS cars which can be achieved in 2WS cars.