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이명재,김광래,유봉환 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.2
By using AIP(Arc Ion Plating) of a physical vapor deposition for the first time in Korea a ceramic tool whose surface is coated single layeredly with TiN is developed. In addition, cutting resistance appearing in the process of finishing cut of hardened carbon tool steel, STC3 is studied. The principal and radial components of cutting resistance in those cutting conditions appear to be the same or similar, and the feed component is relatively small. The feed component is found to be in proportion to cutting width, and the radial component in proportion to cutting thickness. Owing to coating the cutting resistance of a TiN coated ceramic tool increases compared with that of a general ceramic tool.
황문구,이상래,김명녕 大田産業大學校 2001 한밭대학교 논문집 Vol.18 No.-
In this paper, the circuit properties of hi-fi audio interconnect cables are analyzed and verified by input-output signal analysis with the traditional lumped-parameter approach, the connecting cable is modeled and the input-output signal simulation is carried on. And then actual signal input-output transfer characteristics are measured and verified. Input signal is a white noise. Output signal is detected at the other terminal. The results show that it is improper for cables to be handled as a lumped parameter, but must be treated as a distributed parameter approach. Therefore, on this results, a new type distributed-sense cable model is proposed.
권순석,김명녕,이상래,황문구 한밭대학교 2004 한밭대학교 논문집 Vol.21 No.-
이 논문에서는 P₂O_(5)-ZnO-BaO계와 SiO₂-ZnO-B₂O₃계의 반사특성과 유전특성이 연구 되었다. P₂O_(5)-ZnO-BaO계의 반사율은 SiO₂-ZnO- B₂O₃계의 반사율보다 낮게 나타났고, TiO₂의 함유량이 증가할수록 반사율이 감소되었다. 또한 P₂O_(5)-ZnO-BaO계의 유전율은 SiO₂-ZnO-B₂O₃계의 유전율보다 높은 값을 보였고, TiO₂ 함유량이 증가함에 따라 두 계 모두 유전율이 증가되었다. 이 현상은 공간전하효과로 설명될 수 있다. 본 연구의 결과는 높은 반사율과 높은 절연파괴 강도가 요구되는 플라즈마 디스플레이(PDP)의 하판 유전체, 또는 플라즈마 현상을 응용하는 조명 및 광고용 기구의 반사 유전체로서 응용이 가능할 것으로 기대된다. In this paper, the reflectance and the dielectric characteristics for P₂O_(5)-ZnO-BaO system and SiO₂-ZnO-B₂O₃ system have been investigated as a function of contents of TiO₂. The reflectance was decreased with increasing the contents of TiO₂ contents, and the reflectance of P₂O_(5)-ZnO-BaO system was lower than that of SiO₂-ZnO-B₂O₃ system. The dielectric constant of P₂O_(5)-ZnO-BaO system was higher than SiO₂-ZnO-B₂O₃ system, and the dielectric constant in the both system was increased with increasing of TiO₂ contents. This could be explained as the space charge effects. These results are could be applied to the under plate dielectrics of PDP required high reflective ratio and breakdown strength.
유봉환,사승윤,이명재,김광래,강신철 한국공작기계학회 1995 한국생산제조학회지 Vol.4 No.2
The diagnosis and monitoring system of abnormal cutting condition is necessary to realize precision machining process and factory automation, which are final goal of metal cutting. In order to develop this system, the image processing technique has been investigated in machining process. In this paper, the measurement system of tool wear using computer vision is designed to detect the wear pattern by non-contact and direct method and get the realiable wear information about cutting tool. We measured the area of the side and front part of the diamond core drill which is used in 40 kHz ultrasonic vibration machine.
Lee, Hak-Lae,Park, Jung Hwan,Choe, Hyun-Seok,Lee, Myung-Soo,Park, Jeong-Min,Harada, Naoyuki,Sasaki, Yoichi,Yanai, Nobuhiro,Kimizuka, Nobuo,Zhu, Jintao,Bhang, Suk Ho,Kim, Jae-Hyuk American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.30
<P>A recyclable, aqueous phase functioning and biocompatible photon upconverting system is developed. Hollow mesoporous silica microcapsules (HMSMs) with ordered radial mesochannels were employed, for the first time, as vehicles for the post-encapsulation of oil phase triplet-triplet annihilation upconversion (TTA-UC), with the capability of homogeneous suspension in water. In-depth characterization of such upconverting oil-laden HMSMs (UC-HMSMs) showed that the mesoporous silica shells reversibly stabilized the encapsulated UC oil in water to allow efficient upconverted emission, even under aerated conditions. In addition, the UC-HMSMs were found to actively bind to the surface of human mesenchymal stem cells without significant cytotoxicity and displayed upconverted bright blue emission under 640 nm excitation, indicating a potential of our new TTA-UC system in biophotonic applications. These findings reveal the great promise of UC-HMSMs to serve as ideal vehicles not only for ultralow-power in vivo imaging but also for stem cell labeling, to facilitate the tracking of tumor cells in animal models.</P> [FIG OMISSION]</BR>
1.5 V Sub-mW CMOS Interface Circuit for Capacitive Sensor Applications in Ubiquitous Sensor Networks
Sungsik Lee,Ahra Lee,Chang-Han Je,Myung-Lae Lee,Gunn Hwang,Chang-Auck Choi 한국전자통신연구원 2008 ETRI Journal Vol.30 No.5
In this paper, a low-power CMOS interface circuit is designed and demonstrated for capacitive sensor applications, which is implemented using a standard 0.35-μm CMOS logic technology. To achieve low-power performance, the low-voltage capacitance-to-pulse-width converter based on a self-reset operation at a supply voltage of 1.5 V is designed and incorporated into a new interface circuit. Moreover, the external pulse signal for the reset operation is made unnecessary by the employment of the self-reset operation. At a low supply voltage of 1.5 V, the new circuit requires a total power consumption of 0.47 mW with ultra-low power dissipation of 157 μW of the interfacecircuit core. These results demonstrate that the new interface circuit with self-reset operation successfully reduces power consumption. In addition, a prototype wireless sensor-module with the proposed circuit is successfully implemented for practical applications. Consequently, the new CMOS interface circuit can be used for the sensor applications in ubiquitous sensor networks, where low-power performance is essential.
삼중항-삼중항 소멸에 의한 광에너지 상향전환 기술의 원리와 최신 연구현황
이명수 ( Myung Soo Lee ),이학래 ( Hak Lae LEE ),김재혁 ( Jae Hyuk Kim ),신성주 ( Sung Ju Shin ),최현석 ( Hyun Seok Choe ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.6
삼중항-삼중항 소멸에 의한 광에너지 상향전환 기술(Triplet-triplet annihilation upconversion, TTA-UC)은 특정 에너지 조건을 만족시키는 유기물들의 조합에 의해 낮은 에너지의 광자를 높은 에너지의 광자로 변환시키는 특수한 광화학적 공정이다. TTA-UC는 태양광 스펙트럼 중 낮은 에너지 탓에 활용되지 못하고 소실되는 광자를 고 에너지의 광자로 변환시킴으로써 태양광에 기반한 광학기기들의 광에너지 전환효율을 획기적으로 향상시킬 수 있는 기술로 평가받고 있다. 본 논문은 아직 국내학계에 생소한 연구분야인 TTA-UC현상의 광화학적 원리와 특징을 소개하고, TTA-UC와 관련한 최신 연구동향과 응용분야, 그리고 향후 연구방향을 고찰하였다. Triplet-triplet annihilation upconversion (TTA-UC) is a special photochemical process that converts low energy photons to higher energy photon via combination of organic chemicals which fulfill specific energetic criteria. TTA-UC has been known as attractive technology that is able to enhance energy conversion efficiency of the photonic devices based on sunlight, which is achieved by conversion of wasted low energy photons in solar spectrum into higher energy photon. In the present paper, we introduced the photochemical mechanism and characteristics of TTA-UC phe-nomenon, which is yet unfamiliar to the domestic academia, and investigated recent research status, application, and future research directions of TTA-UC technology.
이원평,김광래,이동명 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.4
In this study, to choose the drilling m/c with analysis model for dynamic design of machine tool structures, are used substructure synthesis method for reduction to degrees of freedom of dynamic model and analysis evaluation of substructures. The dynamic factors of substructures are examined by substructure synthesis method. And that dynamic design of structures for energy balancing are performed. The computer program for calculated of the dynamic and energy distribution analysis was developed. Result of numerical analysis by developed program obtained to conclusion as following. The design of machine tool structures by dynamic avoid the resonances, and are known to considered based on the energy balancing. These methods can be used effectively for the performance evaluation, design modification and improvement of dynamic performance of machine tools.