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시분할-파장분할 방식이 혼합된 라우팅 구조를 가지는 대용량 광 ATM 스위치
김광복,박기오,안상호,엄진섭,Kim, Kwang-Bok,Park, Ki-O,Ahn, Sang-Ho,Eom, Jin-Seob 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.2
본 논문에서는 시분할-파장분할 방식이 혼합된 라우팅 구조를 가지는 대용량 광ATM 스위치 구조를 제안하였다. 제안된 구조는 셀의 경로배정 과정에서 겪게되는 광 파워의 손실 및 시스템 구성시 요구되는 하드웨어를 줄일 수 있을 뿐만 아니라 수동소자를 사용함으로써 전기적 제어부분의 복합성을 피할 수 있다. 또한 제안된 스위치는 확장이 용이하도록 설계되어졌기 때문에 처리용량에 있어서 미래의 대욜양 광 교환 시스템에 적합한 구조라고 할 수 있다. In this paper, large capacity Photonic ATM switch structure is proposed. It contains mixed routing structure using TDM and WDM methods. Through this structure, we can get not only required hardware reduction, and optical power loss reduction in cell routing procedure but also the less complexity of electrical parts using passive device. Also, it is designed for ease to simplicity of extension in throughput, so it is suitable structure for large capacity Photonic ATM switching system of the future.
Development of Wearable Glucose Monitoring Sensor for the Healthcare of Diabetic Patients
Kwang Bok Kim(김광복) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: In this paper we report on a novel method for enhancing repeatability and stability of continuous glucose sensor. Background: The most widely used blood glucose monitoring systems are disposable devices based on blood collection by pricking fingers. Diabetic patients are simply able to check blood glucose level with the finger prick tests, but this gives the value of glucose level only at the particular time when the test is done. Therefore, it is difficult that the patients completely check changes of glucose level during the day or night when the blood sugars may go very high or low. Additionally, finger prick tests can induce significant pain and infection problems. Method: The electrode surface is initialized by sequential negative and positive pulse to reduce the factors influencing stability, such as non-faradaic current by residual products. Secondly for evaluation of the continuous glucose sensor, the micro-needle is connected to a reusable transmitter that continuously sends the measured glucose values to a mobile phone via Bluetooth. The insights and knowledge from this study provide a solution to recover the sensor to the same initial state before beginning each trial, which allow the sensor to have reliable results of in-vivo testing. Results: The results shown that the proposed continuous glucose sensor had excellent linear response at glucose concentration between 0 and 400 ㎎/dL with sensitivity of 12.1 nA/㎎·dL-1 (CV = 1.7%) and coefficient of determination, R² = 0.99. In addition, the sequential pulse allowed the sensor to have high repeatability of CV = 1.1% (n=10) and long-term stability of CV = 5.56% for 72 hours. Conclusion: For in-vivo long-term testing, the COC-PPy/GOx-pTTCA/Nafion based micro-needle was combined with the transmitter and penetrated the human skin. Comparing with conventional glucose sensor, it was confirmed that the proposed continuous glucose sensor could measure the glucose in the ISF and maintain its sensitivity under the aggressive biological environment. Application: The proposed continuous glucose sensor does not require a complicated and sophisticated process. Despite the simple structure and short fabrication process, the sensor could have enhanced repeatability and stability. The COC-PPy/GOx-pTTCA/Nafion based continuous glucose sensor has the great potential for evolving into future CGMS for proactive managing diabetes.
김광복(Kwang-bok Kim),이선희(Sun-Hee Lee),박호섭(Ho-seop Park),양동욱(Dong-Wook Yang),김대준(Dae-Jun Kim) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
The field emission lamps have the advantages to their cold cathode-characteristic and the eco-friendly. We realized that the dual emitter system showed very simple structure which gate and cathode electrodes are formed on the same glass surface. In this paper, we reported the properties of dual emitters depended on variation of gate width and spring for optimum panel structure. In combination of dual emitter structure and bi-polar driving, electron beam spreads more than normal gate structure or diode structure, and emission uniformity increased in dual emitter structure at 5""-diagonal.
음향방출시험 기술을 이용한 수소충전소용 복합용기 안전진단
김광복(Kwang-Bok Kim),김봉기(Bong-Gi Kim),우진호(Jin-Ho Woo),김창일(Chang-Il Kim),송기명(Gi-Myung Song),한주봉(Joo-Bong Han),이병일(Byeong-Il Lee),구경완(Kyung-Wan Koo) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
첨단 비파괴 진단 기술의 하나로 폭넓은 응용분야와 뛰어난 정밀성으로 각광받고 있는 AET 기술을 이용하여 수소충전소용 복합저장용기 안전진단 기술을 소개한다. 본 논문에서는 폴리이미드 라이너 위에 CFRP 와인딩 및 레진으로 건조된 Type-IV 구조의 용기로 시험하였다. 사용압력 700bar로 설계된 수소저장용기에서 ASME 코드 절차서에 따라 가압시험과 동시에 AET 시스템으로 결함 인자신호를 수집 및 건전성 유무에 대한 결과를 제시하였다.
Study of New Light Source with Nano Carbon Material
Kwang-Bok Kim(김광복),Yong-Won Kim(김용원),Han-Gi Jung(정한기),Yoon-Ho Song(송윤호) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
The characteristic of carbon nano fiber (CNF) as electron emitters was described. Carbon nano fiber (CNF) of herringbone was prepared by thermal chemical vapor deposition(CVD), mixed with binders and conductive materials, and then were formed by screen-printing process. In order to increase effectively field emissions, the surface treatment of rubbing & peel-off was applied to the printed CNF emitters on cathode electrode. The measurements of field emission properties were carried out by using a diode structure inline vacuum chamber. CNF of herringbone type showed good emission properties that a turn on field was as low as 2.5 V/㎛ and current density was as large as 0.15 mA/㎠ of 4.5 V/㎛ with electric field. After the vacuum packaged panel of 5-inch in diagonal, the measured white brightness was as high as 7000 cd/㎡ at 1900V of anode and 700V of gate voltage.
김광복(Kwang-Bok Kim),양동욱(Dong-Wook Yang),김태현(Tae-Hyeon Kim),김대준(Dae-Jun Kim) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
In this paper, we report the improved driving methode using planar-gate for field emission light source. Due to the cold cathode in field emission device, it has advantage for driving system in terms of high speed pulse driving with narrow duty ratio. This paper shows that our driving method offers the stable and reliable driving system without rapid electric field variation for field emission light source.
Study on Carbon Nano Fiber Emitter for Field Emission Lamp
Kwang-Bok Kim(김광복),Sun-Hee Lee(이선희),Seung-Ho Yu(유승호),Dae-Jun Kim(김대준),Yong-Won Kim(김용원) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
Properties of carbon nano fiber (CNF) as field emitters were described. Carbon nano fiber (CNF) of herringbone was prepared by thermal chemical vapor deposition(CVD). Field emitters mixed with organic binders, conductive materials and were prepared by screen-printing process. In order to increase field emissions, the surface treatment of rubbing & peel-off was applied to the printed CNF emitters on cathode electrode. The measurements of field emission properties were carried out by using a diode structure inline vacuum chamber. CNF of herringbone type showed good emission properties that a turn on field was as low as 2.1 V/㎛ and current density was as large as 0.15 ㎃/㎠ of 4.2 V/㎛ with electric field. Through the results, we propose that CNFs are suitable for application of electron emitters in Field Emission Devices.