열전 공압 액추에이터를 활용한 물고기 소프트 로봇

유명진(Myung Jin Yoo),이진우(Jinwoo Lee),박희재(Huijae Park),고승환(Sweung Hwan Ko) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

웨어러블 소자의 열 관리를 위한 열 보호 층 연구

유명진(Myung Jin Yoo),정영주(Yeongju Jung),고승환(Sweung Hwan Ko) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.4

열전 공압 액추에이터를 활용한 물고기 소프트 로봇

유명진(Myung Jin Yoo),이진우(Jinwoo Lee),박희재(Huijae Park),고승환(Sweung Hwan Ko) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

6 MV 소형 x - 선 beam 측정에 적합한 검출기의 조건에 관한연구

유명진(Myung Jin Yoo),도시홍(Sih Hong Doh) 한국센서학회 1999 센서학회지 Vol.8 No.3

The purpose of this study is to measure such parameters as TMR, OAR, TSF for small beams ranging in size from 12.5mm to 40mm by diode, ionization chamber, film, TLD and to determine proper detectors for the measurement of 6MV small x-ray beams. Diode and film show good results within 2% en-or for the TMR measurement of the beam as small as beam with diameter 12.5mm. Diode and film have excellent spatial resolution in the OAR measurement and the comparison between two detectors shows the error within 3%. But TMR and OAR can not be measured accurately by the ionization chambers. The TSF by diode and TLD records 0.890.96 for the beams with diameter 12.5mm 40mm. The TSF determined by 0.125cc ionization chamber and markus ionization chamber for the larger beams than the beams with diameter 25mm agrees within 2% comparing with that of diode and TLD.

Mentle Field에서 Lung Block의 선량분포 고려

유명진(Myung Jin Yoo),신병철(Byung Chul Sin),문창우(Chang Woo Moon),정태식(Tae Sig Jeung),염하용(Ha Yong Yum) 대한방사선종양학회 1995 Radiation Oncology Journal Vol.13 No.2

Purpose : To evaluate the dose under lung block as a function of depth and the effectiveness of a block as a function of block width. Materials and Methods : Field size of mantle field was 22.8x32.4cm². Dose distribution of the mantle field was measured with two dimensional water phantom system. To analyze the effectiveness of the lung block, central axis plane, 5cm off-axis plane, and 10cm off-axis plane were studied. Results : The dose under the lung block was recorded with maximum at the depth between 5cm and 10cm. In the central axis plane, dosimetric block width was 10-15% less than physical block width. In the 5cm off-axis plane, dosimetric block width was 4-9% less than physical block width. In the 10cm off-axis plane, dosimetric block width was 2% less than physical block width. Conclusion : Depth dependence of the dose under the lung block was founded. Also, block width dependence of the lung block was founded. To induce the accurate relation between the physical block width and the "effective" block width, it needs more detailed understanding of the variables involved.

20~30대 여성의 진 웨어 착용 행동 및 디자인/스타일링 선호도에 관한 연구

유명진 ( Myung Jin Yoo ),김칠순 ( Chil Soon Kim ) 服飾文化學會 2009 服飾文化硏究 Vol.17 No.6

LiF:Mg,Cu,P TLD 의 잠상퇴행과 열처리 특성

도시홍,이우교,유명진,강희동,김도성 ( Sih Hong Doh,Woo Gyo Lee,Myung Jin Yoo,Hee Dong kang ) 한국센서학회 1998 센서학회지 Vol.7 No.5

The thermal annealing, reusability and fading characteristics of the highly sensitive LiF:Mg,Cu,P TLDs are investigated. Thermoluminescent sensitivity of the fabricated LiF:Mg,Cu,P TLD is 25.3 times higher than the commercial dosimeter TLD-700(Harshaw Chemical Co.). The main dosimetric peak shows no fading for 1 month at room temperature and 50% for 7 days at 100 ℃. The thermal annealing characteristics is examined in the temperature range from 260 ℃ to 320 ℃. For annealing the TLD at 280 ℃ for 10 minutes, TLDs can be reusable by recovering the initial sensitivity.

Reduction of Electron Contamination Using a Filter for 6MV Photon Beam

이철수(Choul Soo Lee),유명진(Myung Jin Yoo),염하용(Ha Yong Yum) 대한방사선종양학회 1997 Radiation Oncology Journal Vol.15 No.2

목 적 : 광자선과 블록을 얹는 트레이와의 상호작용에 의해 생성된 2차 전자는 피하층에 과도한 선량증가의 원인이 된다. 이런 전자오염으로 인한 표면선량을 감소시키기 위해 트레이 아래 전자필터를 부착하는 것이 유용하다. 대상 및 방법 : 두께가 다른 Cu판, Al판 그리고 Cu/Al 복합판을 사용하여 전자오염에 의한 표면선량을 감소시키는 효과를 측정하였다. 최적의 필터를 찾기 위해서 10cm×10cm 조사야와 SSD 78.5cm의 기하학적 모형으로 표면에서부터 최대선량 지점까지 2mm 간격으로 흡수선량을 측정하였다. 최적필터의 조사야 의존성을 구하기 위해서 4cm×4cm에서부터 25cm×25cm까지 조사면적을 변화시켜가며 흡수선량을 측정하였다. 결 과 : 표면선량은 조사면적을 증가시키면 서서히 증가하였고 15cm×15cm 조사면적 이상에서는 표면선량이 급속히 증가하였다. Al판을 사용했을 경우 표면선량이 최대선량 지점의 선량보다 낮게 유지되지 않으므로 Al판은 전자필터로는 부적합하였으며 0.5mm Cu판과 Cu/Al=0.28mm/1.5mm 복합판이 최적 전자필터로 결정되었다. 두가지 최적필터의 경우 4cm×4cm 조사면에서는 표면선량을 5.5%(tray 사용할때 표면선량에서 filter 사용할때 표면선량을 뺀 것) 낮출 수 있었고 10cm×10cm에서는 11.3%, 25cm×25cm에서는 21.3%로 낮출 수 있었다. 결 론 : 전자오염에 기인한 표면선량은 조사면적에 의존하였고 트레이를 설치했을때 표면의 전자오염은 많았고 특히 조사면적이 클 때 표면의 전자오염은 더욱 증가하였다. 표면 및 build-up 영역의 선량 특성을 측정한 결과 0.5mm Cu판과 Cu/Al=0.28mm/1.5mm 복합판이 최적 필터로 결정되었다. 트레이 밑에 최적 필터를 부착하면 표면선량을 유효하게 감소시킬 수 있었고 필터의 효과는 조사면적이 클 때 더욱 좋았다. Purpose : Secondary electrons generated by interaction between primary X-ray beam and block tray in megavoltage irradiation, result in excess soft radiation dose to the surface layer. To reduce the surface dose from the electron contamination, electron filters were attached under the tray when a customized block was used. Materials and Methods : Cu, Al or Cu/Al combined plate with different thickness was used as a filter and the surface dose reduction was measured for each case. The measurement to find optimal filter was performed with 10cm×10cm field size and 78.5cm source to surface distance. The measurement points are positioned with 2mm intervals from surface to maximum build-up point. To acquire the effect of field size dependence on optimal electron filter, the measurement was performed from 4cm×4cm to 25cm×25cm field sizes. Results : The surface dose was slowly increased by increasing irradiation field but rapidly increased beyond 15cm×15cm field size. Al plate was found to be inadequate filter because of the failure to have surface dose kept lowering than the dose of deep area. Cu 0.5mm plate and Cu/Al= 0.28mm/1.5mm combined plate were found to be optimal filters. By using these 2 filters, the absorbed dose to the surface layer was effectively reduced by 5.5%, 11.3%, and 22.3% for the field size 4cm×4cm, 10cm×10cm, and 25cm×25cm, respectively. Conclusion : The surface dose attributable to electron contamination had a dependence on field size. The electron contamination was increased when tray was used. Specially the electron contamination in the surface layer was greater when the larger field was used. 0.5mm Cu plate and Cu/Al=0.28mm/1.5mm combined plates were selected as optimal electron filters. When the optimal electron filter was attached under the tray, excessive surface dose was decreased effectively. The effect of these electron filters was better when a larger field was used.

6MV 광자선에서 공동에 의한 조직 선량변동에 관한 연구

신병철(Byung Chul Shin),유명진(Myung Jin Yoo),문창우(Chang Woo Moon),정태식(Tae Sig Jeung),염하용(Ha Yong Yum) 대한방사선종양학회 1995 Radiation Oncology Journal Vol.13 No.4

Purpose : To determine the perturbation effect in the tissue downstream from surface layers of lesions located in the air/tumor-tissue interface of larynx using 6MV photon beam. Materials and Methods : Thermoluminescent dosimeters(TLDs). were embedded at 3 measurement location in slab no.7 of a humanoid phantom and exposed to forward and backward direction using various field sizes(4X4cm²-15X15cm²). Results : At the air/tissue interface forward dose perturbation factor(FDPF) is about 1.085 with 4X4cm², 1.05 with 7X7cm², 1.048 with 10X10cm² and 0.99 with 4X4cm², 0.981 with 7X7cm², 0.956 with 10X10cm² and 0.97 with 15X15cm². Conclusion : FDPF is greater as field size is smaller. And FDPF is smaller as the distance is further from the air/tissue interface.

병기 III 자궁경부암의 방사선치료 결과

문창우,신병철,염하용,정태식,유명진,Moon, Chang-Woo,Shin, Byung-Chul,Yum, Ha-Yong,Jeung, Tae-Sig,Yoo, Myung-Jin 대한방사선종양학회 1995 Radiation Oncology Journal Vol.13 No.3

Purpose : The aim of this study is to analyze the survival rate, treatment failure and complication of radiation therapy alone in stage III uterine cervical cancer. Materials and Methods : From January 1980 through December 1985, 227 patients with stage III uterine cervical cancer treated with radiation therapy at Kosin Medical Center were retrospectively studied. Among 227 patients, 72 patients($317{\%}$) were stage IIIa, and 155 patients($68.3{\%}$) were stage IIIb according to FIGO classification. Age distribution was 32-71 years (median: 62 years). Sixty nine patients($95.8{\%}$) in stage IIIa and 150 patient ($96.8{\%}$) in stage IIIb were squamous cell carcinoma. pelvic lymph node metastasis at initial diagnosis was 8 patients($11.1{\%}$) in stage IIIa and 29 patients($18.7{\%}$) in stage IIIb, Among 72 patients with stage IIIa, 36 patients ($50{\%}$) were treated with external radiation therapy alone by conventional technique (180-200 cGy/fr.) and 36 patients($50{\%}$) were treated with external radiation therapy with intracavitary radiotherapy(ICR) with $Cs^{137}$ sources, and among 155 patients with stage IIIb, 80 patients ($51.6{\%}$) were treated with external radiation therapy alone and 75 patients ($48.4{\%}$) were treated with external radiation therapy with ICR. Total radiation doses of stage IIIa and IIIb were 65-105 Gy(median: 78.5 Gy) and 65-125.5 Gy (median 83.5 Gy). Survival rate was calculated by life-table method. Results : Complete response rates were $58.3{\%}$(42 patients) in stage IIIa and $56.1{\%}$(87 patients) in stage IIIb. Overall 5 year survival rates were $57{\%}$ in stage IIIa and $40{\%}$ in stage IIIb. Five year survival rates by radiation technique in stage IIIa and IIIb were $64{\%},\;40{\%}$ in the group treated in combination of external radiation and ICR, and $50\%,\;40\%$ in the group of external radiation therapy alone(P=NS). Five year survival rates by response of radiation therapy in stage IIIa and IIIb were $90\%,\;66\%$ in responder group and $10\%,\;7\%$ in non-responder group (P<0.001) There were statistically no significant differences of 5 year survival rate by total radiation doses and external radiation doses(40 Gy vs 50 Gy) of whole or true pelvis in stage IIIa and IIIb(P=NS). Treatment failures rates were $40.3\%$(29 patients) in stage IIla and $57.4\%$(89 patients) in stage IIIb. 17 patients ($23.6\%$) in stage IIIa and 46 patients ($29.7\%$) in stage IIIb experienced complications. Total radiation doses more than 85 Gy produced serious complication in both stage IIIa($50\%$) and IIIb($50\%$). Serious complication rates were higher in group received external radiation doses of 50 Gy than 40 Gy to whole or true pelvis in stage IIIa and IIIb. Serious rectal complication developed in rectal doses more than 65 Gy, and serious bladder complication developed in bladder doses more than 75 Gy. Major cause of death was cachexia due to locoregional failure in both stage IIIa($34.7\%$) and IIIb($43.9\%$). Conclusion : From this study, we found that external radiation therapy with ICR was found to have a tendency to be superior to external radiation therapy alone in survival rate, local control rate and complication rate but not different in statistics, and external radiation doses of 50 Gy than 40 Gy to whole or true pelvis produced serious rectal and bladder complications in stage III uterine cervical cancer.