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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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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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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,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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황건성 한양대학교 의과대학 1997 한양의대 학술지 Vol.17 No.2
Distraction Osteogenesis is a biologic phenomenon that can be utilized to induce the formation of new bone. This technique has been used to treat patients with limb-length discrepancy, angular deformities, segmental bone loss, and nonunions. Distraction force is applied commonly with circlar or unilateral fixator. The author review indications, history of limb lengthening, basic principles, surgical technique, and also clinical indications with complications.
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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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이광진,박건영,오선태 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.2
In the pediatric age group, the supracondylar fracture of humerus is the second most common fracture after that of the forearm. But the supracondylar fracture of humerus in children has a greater rate of rereduction, nerve injury, surgical intervention, and poor results than any other type of extremity fracture. Forty eight cases of 48 children with the supracondylar fracture of humerus who had been treated at the department of orthopaedic surgery, Chungnam National University Hospital from February, 1986 to January, 1991, were analyzed retrospectively for the methods of treatment and its results. 1. The mean age of the patients was 8.3 years, ranging from one to fourteen years. 26 boys and 22 girls with minimum six months follow-up were included in this sudy and the most of the causes of injuries were silp-down(45.8%) and fall-down from height(50.0%). 2. Of all fractures, the extension type was 46 cases(95.8%) and the flexion type was 2 cases(4.2%). 3. Accoding to the classification by Pirone et al., fractures were classificated to type Ⅰ in 2 cases, type Ⅱ-A in 6, type Ⅱ-B in 14 and type Ⅲ in 26 cases. 4. There were 8 cases of concomitant peripheral nerve injuries, radial nerve palsy in 6, ulnar nerve in 1 and median nerve in 1 case. 5. The treatment were consisted of closed reduction and casting in 10, closed reduction and percutaneous pinning in 20, and open reduction and multiple pinning in 18 cases with or without preoperative skeletal traction. 6. The clinical and radiological results were Excellent in 22(45.8%), Good in 13(27.1%), Fair in 8(16.7%) and Poor in 5(10.8%) cases, according to the criteria of Flynn. 7. The closed reduction and percutaneous pinnings of 20 cases were rated Excellent and Good results in 18(90.0%) cases and these results were superior to another methods of treatment. So we concluded that the closed reduction and percutaneous pinnings was simple, safe and effective method of the treatment for the supracondylar fracture of the humerus in children. But it was technically difficult to reduce the displaced fracture satisfactory by closed manipulation and in these cases, the open reduction was still indicated.
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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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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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