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RISS 인기검색어
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- 저자 : 金鎭淇(Jin-Kee Kim) (검색결과 10 건)
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김진기,김윤기,Kim, Jin Gi,Kim, Yoon Kee 한국재료학회 2015 한국재료학회지 Vol.25 No.2
Plasma properties of dielectric barrier discharges (DBDs) at atmospheric pressure were measured and characterized using optical emission spectroscopy. Optical emissions were measured from argon, nitrogen, or air discharges generated at 5-9 kV using 20 kHz power supply. Emissions from nitrogen molecules were markedly measured, irrespective of discharge gases. The intensity of emission peaks was increased with applied voltage and electrode gap. The short wavelength peaks (315.9 nm and 337.1 nm) measured at the middle of DBDs were significantly increased with applied voltage. The optical emission from DBDs decreased with the addition of oxygen gas, which was especially significant in argon discharge. Emission from oxygen molecules cannot be measured from air discharge and argon discharge with 4.8% oxygen. The emission intensity at 337.1 nm and 357.7 nm related with nitrogen molecule was sensitively changed with electrode types and discharge voltages. However, the pattern of argon emission spectrum was nearly the same, irrespective of electrode type, oxygen content, and discharge voltage.
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김형진(Hyoung Jin Kim),김정수(Jung Soo Kim),김진기(Jin Kee Kim),권형철(Hyoung Cheol Kwon),오병찬(Byung Chan Oh) 대한방사선종양학회 1996 Radiation Oncology Journal Vol.14 No.3
목적 : 자궁경부암에서 근치적 방사선치료후 치료결과 및 예후에 영향을 미치는 인자와 치료후 합병증, 실패 양상을 알고자 후향적 연구를 시행하였다. 대상 및 방법 : 1986년 3월부터 1990년 5월까지 조직학적 검사로 확진되고 근치적 목적으로 외부조사 및 강내치료를 받은 59명의 환자를 대상으로 후향적 분석을 시행하였다. FIGO 병기에 따른 환자분포는 병기 IIa이하인 Ib, IIa가 각각 2예(3.4%), IIb가 31예(52.5%), IIIb가 15예 (25.4%), IV가 9예(15.3%)였다. 외부조사를 시행한 후, 강내조사를 실시하였는 데, 강내치료는 A점을 기준으로 병기에 따라서 중앙값 3460 cGy(범위: 3000-4366 cGy)까지 조사하였으며, 강내 치료와 외부방사선 치료 전체조사량의 중앙값은 8500 cGy(범위: 8040-10980 cGy)였다. 추적조사 기간은 2개월에서 110개월이었고, 중앙값은 61개월이었다. 결과 : 전체환자의 5년생존율 및 무병생존율은 각각 55.9%와 55.0%였으며, FIGO 병기에 따른 5년 생존율은 병기 IIa이하인 경우 75.0%, 병기 IIb는 74.8%, 병기 IIIb는 26.7%, 병기 IV는 33.3%였다. 단변량 분석에 의하면 병기 IIb이하인 경우 5년 생존율은 74.8%였고, IIIb이상인 경우 29.2% (p<0.005)였다 방사선치료중 혈색소 수준이 한 번이라도 10 gm/dL미만인 환자군의 5년 생존율은 0%였고, 10 gm/dL이상 군은 73.3% (p<0.005)였다. 종양의 크기가 5 cm이상인 18예(30.5%)에서 5년 생존율은 22.2%였고, 5cm미만인 39예(66.1%)에서는 71.8%(p<0.005)였다. 또한 50세이상인 경우와 50세미만인 경우 5년 생존율은 각각 65.3%, 34.2% (p<0.05)였다. ECOG 수행능력 정도, 병리소견, 전체 선량, 전체 치료기간은 통계학적 의미는 없었다. 다변량분석에 의하면 방사선 치료중 혈색소 수준(p=0.0001), 종양의 크기(p=0.0390), FIGO병기 (p=0.0468)가 통계학적 의의를 나타냈다. 전체 환자의 재발율은 23.7%(14/59)로 국소재발이 15.2%(6/59), 원격전이가 6.8%(4/59), 국소재발과 원격전이가 1.7%(1/59)를 보였다. 결장직장과 비뇨생식기에서 각각 15.3%(9/59), 8.5%(5/59)를 보이고, Grade 2는 10예(17.0%), Grade 3은 3예(5.1%), Grade 4도 1예(1.7%)를 나타내고 있다 빈도는 방사선 직장염, 직장 출혈, 방사선 대장염, 설사, 방사선 방광염 순서로 발생하였다. 결론 : 치료결과를 향상시키기 위해서는 전향적인 무작위 표본에 의한 새로운 예후인자 발견 및 예후가 좋지 않을 것으로 예상되는 경우, 치료방법의 개선 및 방사선 감작제 또는 항암제를 병용하여 국소재발과 원격전이 억제를 위한 적극적인 치료방법이 연구되어져야 한다고 사료된다. Purpose : To evaluate 5-year survival rate, patterns of failure and complications of cervical cancer treatment, fifty nine patients treated by curative radiotherapy for the uterine cervical cancer were analyzed retrospectively. Materials and Methods : From March 1986 to May 1990, fifty nine patients with histologically proven uterine cervical cancer were analyzed. According to FIGO stage, there were 2 patients (3.4%) in stage Ib, 2 patients (3.4%) in stage IIa, 31 patients (52.5%) in stage IIb, 15 patients (25.4%) in stage IIIb, 9 patients (15.3%) in stage IV. External RT was per formed by 6 MVLINAC with daily 1.8 Gy, 5 times per week and followed by ICR. A point dose of ICR was calculated to 30-43.66 Gy (median: 34.6 Gy). These techniques delivered total A Point dose of 80.4 to 109.8 Gy (median: 85 Gy). Patients had been followed up from 2 to 110 months (median: 61 months) Results : The overall 5-year survival rate & disease free survival rate were 55.9% and 55.0% respectively. According to FIGO stage, the 5-year survival rate for less than IIa, IIb, IIIb, IV were 75.0%, 74.8%, 26.7%, 33.3%, respectively. In univariate analysis, the 5-year survival rate for stage IIb and below versus stage IIIa and above revealed 74.8%, 29.2% respectively (P<0.005). According to the hemoglobin level during RT, the 5-rear survival rate of was 73.3% for patients with Hg 10 gm/dL or higher, in contrast to 0% for those with lower than 10 gm/dL (p<0.005). In 18 patients with nonbulky tumor (<5cm), the 5-year survival rates were 71.8%. The 5-rear survival rates for 18 patients with 5 cm or greater in tumor diameter were 22.2% (p<0.005). The 5-year survival rate for Patient age of above 50 years and below were 65.3% 34.2% respectively (p<0.05). ECOG performance status. pathologic finding, total dose, total treatment time were not statistically significant factors. The significant prognostic factors affecting overall 5-year survival rate by multivariate analysis showed the hemoglobin level during RT (P=0.0001), tumor size (p=0.0390), FIGO stage (p=0.0468). Total recurrence rate was 23.7% local failure 15.2% (9/59), distant metastasis 6.8% (4/59), local and distant metastasis 1.7% (1/59). According to the RTOG/EORTC Soma Scales, the late complication rate was 23.8% (14/59) The late complication rate of colorectum and genitourinary tract were 15.3% (9/59), 8.5% (5/59), respectively: 10 patients (17.0%) were grade 2, 3 Patients (5.1%) were grade 3 and one patient (1.7%) was grade 4. The late complications were radiation proctitis, rectal bleeding, radiation colitis, diarrhea and radiation cystitis in decreasing order. Conclusion : For improvement of therapeutic results, prospective randomized trials are recomended to discover new prognostic factors and more aggressive radiation therapeutic methods are needed for poor prognostic patients. The adjuvant chemotherapy or radiation-sensitizing agents must be considered to inhibit regional and distant metastasis.
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강자기장이 인가된 물 속에서 고에너지 전자의 궤적 계산
김정기,오영기,신교철,김기환,김진기,김성규,노태익,김진영,지영훈,정동혁,Kim Jeung Kee,Oh Young Kee,Shin Kyo Chul,Kim Ki Hwan,Kim Jhin Kee,Kim Sung Kyu,Ro Tae Ik,Kim Jin Young,Ji Young Hun,Jeong Dong Hyeok 한국의학물리학회 2004 의학물리 Vol.15 No.3
The trajectories for high-energy electrons in water under magnetic fields were calculated approximately by numerical method. A differential equation for electrons under magnetic field was built and the calculation code was devised by Euler method. Using the code, the trajectories for electrons with energies of 3, 5, 10, and 15 MeV in water were calculated in the presence of magnetic fields parallel and perpendicular to the incident electrons. Since we considered only the energy loss and the directional change for primary electrons, there are errors in this calculation. However, based on the results we were able to explain the variation of dose distributions by the external magnetic fields in water. 본 연구에서는 수치해석을 이용하여 강자기장이 인가된 물팬텀 속에서 고에너지 전자의 경로를 근사적으로 계산하였다. 이를 위하여 자기장에서 전자의 방향변화에 관한 방정식을 세우고 오일러(Euler) 방법을 적용하여 전산코드로 구현하였다. 전산코드를 이용하여 입사전자와 수직 및 수평방향의 자기장이 인가된 물팬텀에 대하여 3, 5, 10, 15 MeV 전자의 궤적을 계산하였다. 본 결과는 전자의 다중산란이 고려되지 않아 실제 궤적과 차이가 있으나, 결과로부터 외부 자기장에 의한 물팬텀 속 선량분포의 변화를 설명할 수 있다.
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김진기,김수천,김형동,김수휴,심재홍 대한신경외과학회 1986 Journal of Korean neurosurgical society Vol.15 No.3
This report describes three cases of large arteriovenous malformations which were removed totally with two stage operation. When a large arteriovenous malformation had to be removed, prediction of profuse bleeding and brain swelling could be made. We clipped large feeding arteries and made a cleft around the AVM during the first operation, and the progressive reduction of the shunt flow by clipping the dominant peduncles one after the other diminished the risk of profuse bleeding and brain swelling. 7 to 10 days later, we removed AVM totally as the second operation. All three lesions were resected by microsurgical techniques, and the results were excellent. The rationale for the two stage operation for large cerebral AVM is discussed.
ScienceON
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