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김재문,권덕문,최세곤 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.2
The output characteristics on various rectification methods of X-ray equipments for the purpose of medical use are investigated by means of X-ray multimeter. in comparison the measured values with setting values, the accuracy of X-ray tube voltage and illumination time was varied in the range of +70% in case of three phase type including inverter type. The inverter type also showed a good reproducibility. As the experimental results, it is desirable that the inverter type X-ray equipment will be widely used in the near future.
李茂永,崔世崑 嶺南大學校 工業技術硏究所 1977 연구보고 Vol.5 No.1
주파수-시간분할 address를 사용하는 random access 통신방식은 산간오지등의 비상통신시설로서 적합한 여러가지 잇점을 지니고 있다. 본 논문은 이러한 목적에 가장 적합한 random access형 address를 사용한 간단한 비동기 광대역 무선통신방식을 제안한 것이다. 필자들은 비동기 delta 변조기와 부반송파의 첨가법을 병용하므로서 가입가능수를 최대한 증가시킬 수 있을 뿐 아니라 pulse 발사수를 감소시키므로서 S/N를 대폭 개선 할 수 있음을 이론적으로 증명하였다. 특히 model로서 3주파수 10시간 분할을 사용한 방식을 예를 들었는데 최대 216명이 임의로 상대를 선택 통화할 수 있으며, 77명이 S/N비 13dB 이상으로서 동시통화가 가능한 것이 예시되어 있다. In rural emergency communication, the simplicity is essencial as well as the flexiblity. In this paper, a simple random access radio communication system esecially designed for such purpose is introduced. By utilizing asynchronous delta modulation in conjunction with sub-carrier injection method, it is possible to reduce the error rate of the system and obtain substencial increase in subscriber capacity, with relativerly simple subscriber unit. After the theoritical analisis of the system, the auther introduces proposed model which provides 216 subscribers and allows 77 simultaneous conversation with the S/N of 13db or better over the descrete address consisted of 3 frequency and 10 time slot.
지능화 진단 시스템개발을 위한 광바이오 텔레미트리 칩 제작
서희돈,박차훈,배용욱,최세곤 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1
In this paper, we fabricated optical telemetry IC chip using CMOS process. The telemetering IC with the size of 4 ×4㎟ has the following functions: receiving of command signals, initialization of internal state of all functional blocks, decoding of subject-selection signal, time multiplexing of 4-channel modulated physiological signals, transmission of telemetry signal to extemal system, and auto power down control. The designed synchronous oscillator with low supply voltage dependence operates at a supply voltage from 4.6V-6.0V. And the nonlinearity error of PIM modulator was less than 1.2%FS. In order to demonstrate the principle operations of the implemented CMOSIC chip, the experiments of biotelemetry was performed by telemeter unit and external unit. Main features of this system are to select one of the 4 subjects, to enable measurement of biological signals using the same optical signal, and transmit them back to the extemal unit.
Al/P-Si MIS型 太陽電池의 製作과 그 特性에 관한 硏究
金載文,安永奉,崔世崑 嶺南大學校 工業技術硏究所 1985 연구보고 Vol.13 No.1
The Al/P-Si MIS solar cells were fabricated by vacuum evaporation method. The interfacial oxide layer was grown by ramp heating for 5 minutes. Thin Aluminum film was deposited on the chemically etched (100) surface of a single sillcon crystal by vacuum evaporation. The solar cells showed good rectification properties which have the built-in potential of 0.76V and the quality factor of 1.6 under dark condition. The cells indicated that the open circuit voltage, short circuit photocurrent density, fill factor and energy conversion efficiency were 0.53V, 35mA/㎠, 0.62 and 12.4%, respectively, under 98mw/㎠ tungsten halogen lamp irradiation.
高精度의 DUAL-SLOPE 積分型 A/D 變換器 設計
박차훈,서희돈,최세곤 嶺南大學校 工業技術硏究所 1990 연구보고 Vol.18 No.1
In this paper, an effective method, which eliminates the error of the preamplifier, the integrator and the comparator, is proposed. An improved dual-slope integrating A/D converter, composed of the two-stage operational amplifier which is controlled by the control logic circuit switches and the variable ring counter, is for high accuracy. The results of computer simulation show that the conversion error is eliminated completely and the accuracy improved up to the level of the amplification of operational amplifier. These results satisfy the requirment of performance for the high accuracy dual-slope integrating A/D converter.
HCI Gettering Oxidation을 이용한 BJT의 저잡음화에 관한 실험적 연구
최세곤,서희돈 대한전자공학회 1984 전자공학회지 Vol.21 No.1
본 논문에서는 저잡음 BJT를 만들기 위하여 HCI gettering oxidation 방법을 적용하였다. HCI 양의 변화에 따른 플리키 잡음 spectral intensity의 변화를 측정한 결과 BJT의 플리키 잡음이 표면 상태에 의존하고 있음과 저잡음 BJT를 만들기 위한 oxidation 공정의 gettering 조건은 HCI 양이 2%일 때 최적임을 알 수 있었다. 또 에미터 광산 공정에서 형성된 PSG층의 gettering 효과는 HCI gettering 결과에 비해 미약함도 알게 되었다. In this paper, the authors applied the method of hydrogen chloride gettering oxidation to fabricate the low noise bipolar transistor. The results of measurements of the effect of guttering on the variation of flicker noise spectral intensity for variable HCI concentrations indicate that flicker noise in bipolar than-sistor is dependent on the surface condition and that the gettering in a mixture of 2% HCI in oxidation produced the optimal results in the fabrication of the low noise device. In addition, it was also noted that the PSG layer formed by the emitter source (phosphorus) did not have so much guttering effect as in the process with HCl getterinng.
MOSFET에서 저주파잡음의 산화막 두께 의존성 관한 실험적 연구
최세곤 대한전자공학회 1982 전자공학회지 Vol.19 No.1
본실험에서는 N형 Si기판 내부에 P+소오스, 드레인 영역동 마련하고 게이트전극으로서는 PH₃ 를 첨가한 구조로서 Poly-Si gate MOSFET를 제작하여 이에 대한 잡음 특성에 관해 고찰하였다. 실험결과 게이트 면적이 일정하고 막두께가 비교적 두꺼울때는 W/L비 1이상에서는 잡음이 정감되는 경향으로 대체로 이론에 일치하지만 1이하에서는 막두께에 따른 변화는 완만하다는 것이 실증되었다. The purpose of this experiment is to evaluate the noise dependency on the gate dimensions of the P-ch MOSFET which is fabricated of p+ sourse, drain, and gate electrode doped with PH$_3$ gas in type-N Si sudstrate. Experimental results indicate that: for the constant gate area and reletively thick films, noise level tends to decrease for the W/L ratio over unity, which generally conforms with theoretical observations, but its variation with the change in the thickness of film is less than the theoretically predicted for the W/L ratio below unity.