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RGB형 LED Backlight의 전류 및 온도 변화에 따른 특성 분석
임수현(S.H. Lim),임정규(J.G. Lim),신휘범(H.B. Shin),정세교(S.K. Chung),신민재(M.J Shin),손승걸(S.G. Sohn) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
The LCD backlight technique using light-emitting diode(LED) has been studied in the recent backlight market. The white light is need for LCD backlight and it is generally implemented by combining the RGB-LEDs to obtain the high brightness. However, RGB-LEDs have different color characteristics for the current and temperature variations, which results in the color shift problem. The color shift characteristics of RGB-LEDs for the current and temperature variations are investigated in this paper. This result can be used to control the color of backlight system using RGB-LEDs.
항공기 디스플레이용 LED Backlight의 광대역 Dimming Controller 구현
임수현(S.H. Lim),임정규(J.G. Lim),신휘범(H.B. Shin),정세교(S.K. Chung),신민재(M.J. Shin),손승걸(S.G. Sohn) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
This paper describes an implementation of a wide-range dimming controller of a LED backlight for Avionics applications such as the control data unit(CDU) and multi-function display(MFD). A feedback controller using a light sensor is proposed to control the brightness in the low dimming range. The proposed controller provides an improved control performance in the wide dimming range of 1:3000 even under the temperature variations. The experimental results are provided to show the effectiveness of the proposed control system.
김현준,주상규,임수현,변미경,한상휘,허웅 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-
As medical technology develops and the interest of health increases, diagnostic study for diseases and development of medical treatments are actively progressing. However, development of oriental diagnosis equipments leave much too be desired. In this paper, we developed a system to objectify mac-I in on this score. The RSP signals are detected by using a thermistor which detects temperature variation of nasal air flows, the PPG signals are detected by using reflected volume of light through transmitting light at the blood vessel, and EEG signals are detected by using disposable Ag-AgC1 electrode. Besides we classified frequency components of EEG signal through acquired signals, we measured the number of pulse per one respiration. In this study, as the result of experimets among subjects using the developed system, we could acquire proper waveforms of biomedical signals to detect the number of pulse per one respiration.
김철,위성년,문은주,이학림,임수현,이세용 대한산부인과학회 1991 Obstetrics & Gynecology Science Vol.34 No.2
저자는 만 6년간(1983년 1월 1일~1988년 12월 31일) 부산 성분도병원 산부인과에 입원하였던 산모 10,162예 중 제왕절개술을 시행하였던 1,801예에 대한 임상 통계학적 관찰을 하였던 바, 다음과 같은 결론을 얻었다. 1. 제절의 빈도는 총 분만 산모의 17.7%이었고, 매년 증가하다가 최근 2년(1987년, 1988년)동안은 약간 감소하였다. 2. 연령별 분포는 26~30세군이 전체의 63.7%로 가장 많았고, 21~25세군이 21.4%, 31~35세군이 11.6%의 빈도를 나타내었으며 평균연령은 27.7세이었다. 3. 임신주수별 분포에서 임신 39~40주군이 55.4%로 가장 많았고, 임신 39~42주사이에 76.8%로서 높은 빈도를 보였다. 4. 1차제절의 적응증은 아두골반 불균형이 전체의 47.7%로서 가장 높은 빈도이었고, 다음이 골반위, 태아절박증, 전치태반 및 자궁수축부전의 순위이었다. 미경산부와 경산부로 분류하여 관찰하였을 때, 미경산부의 제절 적응증의 빈도 순위는 1차제절과 유사하였으나, 경산부에서는 골반위가 가장 높은 빈도를 보였고, 다음이 아두골반 불균형, 전치태반 등의 순위로 나타났다. 반복제절의 적응증은 선택적 반복제절이 96.6%로 가장 많았고, 다음이 골반위, 전치태반의 순위로 나타났다. 5. 제절술식은 자궁협부횡절개술이 98.1%로 거의 대부분의 경우 시행되었고, 자궁체부종절개술은 1.6%이었다. 제왕절개 자궁적출술은 6예(0.3%)에서 시행되었고, 이의 적응증은 전치태반으로 인한 심한 출혈, 전치태반이 있었다. 6. 제절과 병행된 수술은 난관결찰술이 21.9%로 가장 많았고, 다음이 충수돌기절제술 9.8% 및 자궁부속기절제술 0.5%의 빈도를 보였다. 7. 제절시 실혈량은 500~999 ml군이 64.4%로 가장 많았고, 다음으로 1000~1499 ml군이 33.4%이었다. 마취방법은 전신마취가 79.0%, 척수마취가 21.0%에서 시행되었다. 8. 모성 이환율은 전체의 6.8%이었고, 이 중 산욕열이 3.1%, 창상감염이 2.2%의 빈도를 보였다. 빈혈정도와 모성 이환율의 관계에서 입원시 혈색소치 10 mg%이하군(22.1%)에서 모성 이환율은 10.7%와 10 mg 이상군에서는 13.8%의 이환율을 나타내어서, 빈혈정도가 심한 경우 오히려 모성 이환율이 감소하였다. 9. 신생아 평균 체중은 3.28 kg이었으며, 3000~3499 gm군이 전체의 44.0%로 가장 높은 빈도를 나타내었다. 10. 주산기사망율은 0.49%이었고, 사산의 원인은 원인불명, 태반조기박리이었다. 11. 모성사망은 없었다. Clinical analysis was carried out retrospectively, based on the charts of 1801 cases of cesarean section out of 10,162 deliveries from January, 1983 to December 1988 at the St.Benedict hospital, Busan, Korea. The results were as follows. 1. There were 10,162 deliveries with 1801 cases of Cesarean section, giving an incidence of 17.7%, The primary Cesarean section rate was 11.4% and repeat Cesarean section rate was 3.3%. 2. According to the age distribution 63.7% of total cases were between 26~30 year old group, 21.4% between 21~25 year old group and 18.4% between 31~35 year old group. The mean age was 27.7 year old. 3. The greatest portion(55.4%) of the cases was done between 39~40 gestational weeks group and 76.8% of the cases was done between 39~42 weeks. 4. Indication of primary Cesarean section were C.P.D.(47.7%), breech presentation(25.9%), fetal distress(5.7%), placenta previa(4.0%) and miscellaneous. In nullipara, indications were similar to above in order. But in multipara, breech presentation was the highest incidence, 43.3% and C.P.D., placenta previa, fetal distress in order. 5. In the types of operation, lower cervical transverse incision was the most common(98.1%), classic type was 1.6% in rate and Cesarean hysterectomy was 0.3% in rate. The most common indication of Cesarean hysterectomy was uncontrolled bleeding from placenta previa. 6. In the incidental operation during Cesarean section, the tubal ligation was the most common(21.9%) and then Incidental appendectomy was 9.8% and salpingoophorectomy was 0.4% in rate. 7. 64.4% of the cases belonged to 500~900 ml blood loss group, and 1,000~1,499 blood loss group 33.4%, In the type of anesthesia, general anesthesia was performed 79.0% of total cases and spinal anesthesia was done 21.9%. 8. The rate of maternal morbidity was 6.8%, of which puerperal fever was 3.1%, and wound infection was 2.2% in rate. 9. In the relation of Hb. level and maternal morbidity, Hb. 10 gm% or less group revealed 10.7% of maternal morbidity and Hb. 10 gm% or over group revealed 13.8% of maternal morbidity. 10. The mean weight of the new bron baby was 3.29kg. The greatest portin(44.0%) belonged to 3,000~3,499 gm group. 11. Pernatal mortality was 0.49% and the most comon cause of neonatal death was abruptio placenta. 12.There was no materal death.