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李健一,宋奎翼 경북대학교 공과대학 1976 工大硏究誌 Vol.5 No.-
The telephone-number-digital-display-circuit is designed, which picks up initially a signal from dial pulses with little effect on telephone and can finally display the successive dial numbers on LED display unit up to 10 digits. The dynamic display system and TTL IC were used to simplify wiring and the number of logic gates, and to improve the performance respectively. This circuit was high reliable in the temperature range of 0°―70℃. It can be used to monitor dialing numbers to give confidence to subscribers, to test misconnecting troubles in telephone exchange offices, to inspect a complete dial set in a factories manufacturing the telephone set.
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Ρ-n接合에 있어서의 Avalanche Breakdown의 遲延時間
李宇一,孫炳基,李健一 慶北大學校 1970 論文集 Vol.14 No.-
The fluctuation of current pulse delay time in the onset of the avalanche breakdown of p-n junctions after the application of a step voltage has been investigated. The pulse counting rate R for the delay time t is expressed in terms of the trapped carrier density, the detrapping time, the activation energy of the trap, temperature, and illumination. The theory predicts the linearity between In R and t provided that the temperature and illumination of the junction are kept constant. The prediction was in good agreement with experimental results.
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李健一 경북대학교 공과대학 1976 工大硏究誌 Vol.5 No.-
A simple and high reliable first 0 telephone number detector is designed to control the DDD telephone system.
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李建一,崔文奭 慶北大學校 1976 論文集 Vol.22 No.-
A low cost and dfficient trasformer-less SCR regulator has been developed on the basis of J.Hicks and A.Hopengarten's circuit by the method of replacing the dc feedback circuit with an ac feedback circuit. The improved circuit can also work in full-wave instead of their half-wave operation. A simple constant voltage circuit employing the avalanche diode has been added for the reference voltage. The regulated dc output voltage range has been from 15 to 80 volts for the current up to about 1.5 amperes and its line regulation can be good as one percent over the range from 15 to 40 volts.
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出力電壓과 內部抵抗의 可變이 서로 獨立的인 內部抵抗可變 直流安定化電源
李健一 경북대학교 공과대학 1977 工大硏究誌 Vol.6 No.-
In this work, we have designed dc regulated power supply with variable internal resistance where output open circuit voltage and internal resistance are independently varied each other. The electrical characteristics observed in this power supply can be outlined as following: 1) Internal resistance can be varied equivalently in wide ranges from 0.2 to 500 ohms, 2) practically no vriation (within 0.02 percent per volt) is observed in output open circuit voltage when the internal resistance is varied, and 3) practically no variation (within 0.05 percent per ohm) is observed in internal resistance when the output open circuit voltage is varied.
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李健一,李德東 慶北大學校 1975 論文集 Vol.20 No.-
(Ag_xCu_(1-x))_2HgI_4 (0≤x≤1) CTR thermistors were fabricated and their electrical characteristics were investigated. The x-dependent critical temperatures were in the range of (45∼75)℃. The x=0.9 samples gave the highest resistance anomaly index, 3.
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李健一 경북대학교 공과대학 1977 工大硏究誌 Vol.6 No.-
A high reliable line connected first 0 telephone dial pulses dector has been designed with CMOS integrated circuits to control the DDD telephone system.
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朴成漢,李健一 경북대학교 공과대학 1974 工大硏究誌 Vol.3 No.-
Nagata's negative resistance circuit, which consists of complementary transistors, presents wide-range linear and stable negative resistance characteristics. These characteristics are controlled by the choice of a resistor and indepependent of transistor parameters. The i-ν characteristic of this circuit is an S-curve and is very similar to that of SCR. The peak input voltage of the circuit is controlled by the load resirtor R_c of the first transistor, and the trigger current to the base of the first transistor. It increases linearly with the log (1/R_c) and the trigger current.
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스위치 커패시터 位相固定回路를 利用한 周波數合成方式의 텔레비젼 選局回路
文光碩,李健一 경북대학교 공과대학 1984 工大硏究誌 Vol.13 No.-
In this paper, a television-channel selection circuits using SC-PLL was designed and interface circuits for the microprocessor was provided. The circuit has employed one-touch channel selection method and sequential channel selection method. The tuning speeds of the system in FCC normal channels were about 0.3 sec. Overall experimental circuits of this paper can be implemented one-chip IC.
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김재식,이원길,박정한,이건일 慶北大學校 醫科大學 1996 慶北醫大誌 Vol.37 No.3
목적 : 원내감염실태를 조사한 경험을 당시 노출되었을 때 발생하였을 주변사정 때문에 시간이 상당히 경과한 지금에 와서 겨우 당시 경북대학교병원내 병원감염을 조사한 것을 앞으로 병원감염관리에 참고 자료로 하기 위하여 본 경험을 발표한다. 재료 및 방법 : 400명의 대상 환자들이 신규로 입원할 때 부터 퇴원을 할 때까지 매일 한 번씩 병력지를 검토하고 환자를 방문하여 작성하고 작성된 조사표에 해당 항목별로 기록하고 원내감염의 감별은 Senic project의 기준에 의하였으며 원내감염발생율과 원내환경으로 구분하여 조사하였고 후자는 균배양 동정을 시행하였다. 결과 : 운내감염발생율에 있어서는 당시 1983년 전후 일정기간동안 원내감염 발생률은 9.0%이었으며 원내감염 발생은 의료수기의 빈도가 큰 정형외과와 일반외과에서 특히 높았다. 원내환경에 있어서는 수술과정, 수술실내와 병동내에서 사용되고 있는 의료기자재와 소독약 zephirane에서 균배양 양성이었다. 균종으로는 Serratia, Pseudornas, Klebsiela와 Staphylococcus등이었다. 결론 : 이상의 성적을 종합하면 결론적으로 비교적 높은 원내감염율은 관련의사, 진료보조원 및 신중한 항생물질의 사용 등에 대한 대책을 필요로 하며 항생제 남용을 피하고 그때 그때 병력지 기록의 중요성을 암시하며 원내감염의 근원이 되는 원내환경의 철저한 관리가 필요하다. One experience of investigation of hospital infection in Kyungpook National University Hospital around 1983 was summarized as follows though postponed report with surrounding conditions was inevitable. The patient charts were reviwed daily and recorded the hospital infection data collection sheet according to items by visiting patients. The hospital infection was differentiated on the basis of Senic project. In incidence of hospital infection the rate of hospital infection of in-patient was 9.0% and it was nore high in more frequent usage of medical manipulation like surgical dressing and instrumentation. The use of antibiotic was more frequent in more frequent hospital infection sites. Medical recording was inapproproate in most cases. In hospital environment bacterial organisms were cultivated from various conditions on sites as surgical operation and dressing and ward procedure like urethral catheterization in operation room and ward. Bacterial organisms were cultivated from various conditions in operating room and ward and particularly from zephirane(antisepic). Organisms were Serratia, Pseudomonas, Klebsiella and Staphylococcus etc. A cautious prevention of hospital infedtion was highoy recommended against medical doctors especially and related paramedical personnel as nurse, as well as satistactory medical recording. The hospital environment control is strongly reccmmended.
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