항통을 주소로 내원(來院)한 크론병(Chron's disease) 호전 1례

박종민,김호준,금동호,박영회,이명종,Park, Jong-Min,Kim, Ho-Jun,Keum, Dong-Ho,Park, Young-Hoi,Lee, Myeong-Jong 척추신경추나의학회 2010 척추신경추나의학회지 Vol.5 No.1

항통을 주소로 내원한 환자의 크론병에 대한 침구(鍼灸)치료로 복통 및 설사의 관해 상태가 되는 양호한 효과를 얻었기에 보고하는 바이다. 다만, 치료 기간이 짧아 증상의 변화의 추적이 필요한 상태이며, 다양한 임상적 연구를 위한 임상사례 데이터가 축적되어야 할 것으로 사료된다. Objective: This study evaluated the effects of Oriental treatments on one patient who was diagnosed to Crohn's disease. Methods: One patient was diagnosed as Crohn's disease by physician. We used acupuncture and moxibustion at 曲池(LI11), 天樞(S25), 足三里(ST36), 合谷(LI4) and (GL25), 2 times per week about one month. We analyzed the change symptom by Crohn's disease activity index(Harvey-Bradshaw index) before and after treatment. Results: After treating acupuncture and moxibustion in the case, We found out that the Crohn's disease activity index score was significantly improved after treatment. First the number of liquid or very soft stool was decreased to 2 times a day and the stools became more solid condition. The abdominal pain and use of anti-diarrhea medication score came to none. The well being score set slightly below poor condition. Conclusions: These result suggest acupuncture, moxibustion were effective to Crohn's disease clinical symptom. These could help patient ordinary life by reducing abdominal pain and diarrhea.

금속쐐기와 기능강화동적쐐기의 조사야 주변부 선량 비교

박종민,김희정,민제순,이제희,박찬일,예성준,Park, Jong-Min,Kim, Hee-Jung,Min, Je-Soon,Lee, Je-Hee,Park, Charn-Il,Ye, Sung-Joon 한국의학물리학회 2007 의학물리 Vol.18 No.3

방사선 방호의 측면에서 기능강화동적쐐기가 금속쐐기에 비하여 가지는 이점을 평가하기 위하여 각각의 쐐기에서 산란되는 조사야 주변부 선량을 측정하였다. 측정 장비는 2D Array를 사용하였고 장비의 신뢰성을 검증하기 위하여 측정값과 치료계획장치에서 계산된 결과를 비교하였다. $15^{\circ},\;30^{\circ},\;45^{\circ},\;60^{\circ}$의 금속쐐기와 기능강화동적쐐기를 사용하였을 때에 선원표면간거리를 80 cm에서 90 cm로 변화시키며 조사야 주변부의 선량백분율을 측정하였다. 광자선의 에너지는 6 MV와 15 MV를 사용하였다. 측정은 0.5 cm 깊이에서 조사야 경계로부터 1 cm부터 5 cm까지 1 cm 간격으로 이루어졌다. 열형광선량계를 사용하여 절대 선량을 측정하였다. 2D Array를 사용하여 측정하였을 경우, 기능강화동적쐐기를 사용하였을 때의 조사야 주변부 선량백분율($1.4%{\sim}11.9%$)이 금속쐐기를 사용하였을 때($2.5%{\sim}12.4%$)에 비하여 낮았다. 15 MV의 에너지를 사용했을 경우에 6 MV의 에너지를 사용했을 경우보다 조사야 주변부 평균 선량백분율이 2.9% 높았다. 선원표면간거리가 80 cm일 경우에 90 cm일 경우보다 선량백분율의 차이를 분명히 확인할 수 있었다. 쐐기의 Heel 방향의 선량백분율이 Toe방향의 선량백분율보다 평균적으로 0.9% 낮았다. 열형광선량계를 이용한 절대 선량 측정에서도 2D Array를 사용하여 측정한 경우와 합치하는 결과가 나왔다. 기능강화동적쐐기는 임상에서 조사야 주변부의 정상조직에 불필요하게 산란되어 전달되는 선량을 감소시켜준다. 이러한 이점은 쐐기의 각도가 증가하고 선원표면간거리가 감소할수록 더욱 부각된다. In order to evaluate the radio-protective advantage of an enhanced dynamic wedge (EDW) over a physical wedge (PW), we measured peripheral doses scattered from both types of wedges using a 2D array of ion-chambers. A 2D array of ion-chambers was used for this purpose. In order to confirm the accuracy of the device we first compared measured profiles of open fields with the profiles calculated by our commissioned treatment planning system. Then, we measured peripheral doses for the wedge angles of $15^{\circ},\;30^{\circ},\;45^{\circ},\;and\;60^{\circ}$ at source to surface distances (SSD) of 80 cm and 90 cm. The measured points were located at 0.5 cm depth from 1 cm to 5 cm outside of the field edge. In addition, the measurements were repeated by using thermoluminescence dosimeters (TLD). The peripheral doses of EDW were (1.4% to 11.9%) lower than those of PW (2.5% to 12.4%). At 15 MV energy, the average peripheral doses of both wedges were 2.9% higher than those at 6MV energy. At a small SSD (80 cm vs. 90 cm), peripheral dose differences were more recognizable. The average peripheral doses to the heel direction were 0.9% lower than those to the toe direction. The results from the TLD measurements confirmed these findings with similar tendency. Dynamic wedges can reduce unnecessary scattered doses to normal tissues outside of the field edge in many clinical situations. Such an advantage is more profound in the treatment of steeper wedge angles, and shorter SSD.

침수피해에 의한 벼 감수량 추정기법 개발

박종민,김상민,성충현,박승우,Park , Jong-Min,Kim , Sang-Min,Seong, Chung-Hyun,Park, Seung-Woo 한국농공학회 2004 한국농공학회논문집 Vol.46 No.5

The amount of rice yield reduction due to inundation should be estimated to analyse economic efficiency of the farmland drainage improvement projects because those projects are generally promoted to mitigate flood inundation damage to rice in Korea. Estimation of rice yield reduction will also provide information on the flood risk performance to farmers. This study presented the relationships between inundated durations and rice yield reduction rates for different rice growth stages from the observed data collected from 1966 to 2000 in Korea, and developed the rice yield reduction estimation model (RYREM). RYREM was applied to the test watershed for estimating the rice yield reduction rates and the amount of expected average annual rice yield reduction by the rainfalls with 48 hours duration, 10, 20, 50, 100, 200 years return periods.

OFDM 기반 다중 무선 통신 환경에서의 효과적인 모드 선택 기법

박종민,강민수,조성호,Park, Jong-Min,Kang, Min-Soo,Cho, Sung-Ho 대한전자공학회 2008 電子工學會論文誌-TC (Telecommunications) Vol.45 No.2

When there are numerous wireless communication systems co-existing in the limited available frequency resource, an unexpected time delay can be caused during the system switching. So, in order to reduce this time delay, a mode selection method is required. In this paper, we propose a mode selection method to minimize the time delay for multi-system wireless communication systems. For the sake of efficiency, the mode selection method is designed by analyzing the preamble characteristics of different standards. Instead of performing a full search, we propose the preamble partial search to reduce the time delay to a minimum. Simulated with Matlab in an additive white Gaussian noise(AWGN) environment with a signal to noise ratio(SNR) of 10dB and bit error rate(BER) of $10^{-6}$, we evaluated and showed the performance improvement gained by using our proposed mode selection method. 한정된 가용 주파수(usable frequency resource) 내에 여러 무선 통신 시스템들이 혼재(co-existence) 한 상황에서 시스템 간 절체(switching) 시 원치 않는 지연 시간이 발생 할 수 있다. 이러한 다중 무선 통신 환경 내에서 지연 시간을 감소시키는 시스템 선택 기법을 요구하고 있어 지연 시간을 최소화 하는 모드 선택 기법(MSM : mode selection method)을 제시 하였다. 효율적인 모드 선택 기법을 위해 각 표준별 프리엠블의 구조적 특성을 분석하여 모드 선택 시 전체 검색(full search) 보다 효율적인 부분 검색(partial search)을 이용하여 지연 시간을 최소화 하는 모드 선택 기법을 시뮬레이션 하였다. 부가 백색 가우시안 잡음(AWGN) 환경 내의 신호 대 잡음비(SNR)가 10dB, 비트 에러율(BER)이 $10^{-6}$ 이상 일 경우 효율적인 시스템 선택이 가능함을 매트랩을 이용하여 비교 검증 하였다.

2002년도 고품질 쌀 생산대책

박종민,Park Jong Min 한국관개배수위원회 2001 한국관개배수논문집 Vol.8 No.2

Commissioning Experience of Tri-Cobalt-60 MRI-guided Radiation Therapy System

박종민,박소연,우홍균,김정인,Park, Jong Min,Park, So-Yeon,Wu, Hong-Gyun,Kim, Jung-in Korean Society of Medical Physics 2015 의학물리 Vol.26 No.4

본 연구는 뷰레이 시스템의 커미셔닝 결과에 대한 보고이다. 먼저, 시스템 안전장치의 적절한 작동을 확인했다. 영상시스템에 대한 평가를 위해 신호 대 잡음비와 영상의 균질도, 공간적 무결성을 확인했다. 카우치 동작의 정확성 및 축교점의 일치성을 평가했다. 미국의학물리학회 특별업무단51규약 프로토콜에 따라 절대선량을 측정했다. BJR supplement 25에서 제공하는 심부선량백분율과 측정한 값의 차이, 치료계획에서 계산한 값과 측정한 심부선량백분율의 차이를 확인했다. 더불어, 출력인수에 대하여, 측정값과 계산값의 차이를 구했다. 최종 검증 단계로, 8개의 세기변조방사선치료계획을 사용하여 감마평가를 수행하였다. 커미셔닝을 수행한 결과, 모든 안전장치는 적절히 구동함을 확인했다. 신호 대 잡음비 값과 영상 균질도 값은 허용범위 이내임을 확인했다. 공간적 무결성 확인 결과, 반지름 10 cm 및 17.5 cm 안의 모든 지점에 대하여 각각 1 mm 및 2 mm 이내의 오차를 확인했다. 카우치는 x, y, z 방향으로 각각 0.2 mm, 0.1 mm, 0.2 mm의 오차를 보였다. 방사선 축교점과 가상 축교점 사이에는 x, y, z 방향으로 0 mm, 0 mm, 0.3 mm의 오차를 보였다. 영상 시스템의 축교점과 가상 축교점 사이에는 0.6 mm, 0.5 mm, 0.2 mm의 오차를 보였다. 다엽콜리메이터의 평균적 구동 오차는 0.6 mm였다. 측정한 출력의 오차는 0.5% 이내, 심부선량백분율 오차는 1% 이내, 출력인수 오차는 2% 이내였다. 세기조절방사선치료 감마평가 결과값이 $99.9%{\pm}0.1%$였다. The aim of this study is to present commissioning results of the ViewRay system. We verified safety functions of the ViewRay system. For imaging system, we acquired signal to noise ratio (SNR) and image uniformity. In addition, we checked spatial integrity of the image. Couch movement accuracy and coincidence of isocenters (radiation therapy system, imaging system and virtual isocneter) was verified. Accuracy of MLC positioing was checked. We performed reference dosimetry according to American Association of Physicists in Medicine (AAPM) Task Group 51 (TG-51) in water phantom for head 1 and 3. The deviations between measurements and calculation of percent depth dose (PDD) and output factor were evaluated. Finally, we performed gamma evaluations with a total of 8 IMRT plans as an end-to-end (E2E) test of the system. Every safety system of ViewRay operated properly. The values of SNR and Uniformity met the tolerance level. Every point within 10 cm and 17.5 cm radii about the isocenter showed deviations less than 1 mm and 2 mm, respectively. The average couch movement errors in transverse (x), longitudinal (y) and vertical (z) directions were 0.2 mm, 0.1 mm and 0.2 mm, respectively. The deviations between radiation isocenter and virtual isocenter in x, y and z directions were 0 mm, 0 mm and 0.3 mm, respectively. Those between virtual isocenter and imaging isocenter were 0.6 mm, 0.5 mm and 0.2 mm, respectively. The average MLC positioning errors were less than 0.6 mm. The deviations of output, PDDs between mesured vs. BJR supplement 25, PDDs between measured and calculated and output factors of each head were less than 0.5%, 1%, 1% and 2%, respectively. For E2E test, average gamma passing rate with 3%/3 mm criterion was $99.9%{\pm}0.1%$.

타인의 관찰에서 안전한 패스워드 시스템

박종민,김용훈,조범준,Park Jong-Min,Kim Yong-Hun,Cho Beom-Joon 한국정보통신학회 2004 한국정보통신학회논문지 Vol.8 No.8

본 논문에서는 다중 사용자가 컴퓨터 시스템을 이용하려는 사용자의 적법성을 확인하는 방법을 개선하기 위하여 타인의 관찰로부터 노출되기 쉬운 패스워드의 약점들을 보안하고, 시스템의 안전성을 높이기 위한 SPS(Secure Password System)라는 패스워드 시스템을 제안하였다. SPS는 쉬운 구현과 낮은 비용을 포함한 전통적 패스워드 시스템의 대부분의 이점들을 받아들였고, 또한 전통적 패스워드 시스템에 쉽게 이식될 수 있다. 제안한 SPS는 실험 결과 침입자의 온라인 사전적 공격과, 클라이언트에서의 패스워드 노출에 대해 높은 안전성을 보였다 In this paper, the new password system called SPS(Secure Password System) in order to enhance the security of the system as well as to improve the weakness of the password which is very easy to be disclosed by other people, improving the methods which is identifying the users' legality using the computer system in the multi-users computer. SPS is adopting several strong points such as Easy Embodiment, Low Cost, and most of the good points of the traditional password system. In addition, it makes an easy introduction from the traditional password system. Above SPS has the high stable security in the practical experiments about both the literal attack of the online intruders and the exposure of Clients' password.

농업협동조합 개혁

박종민,Park Jong Min 한국관개배수위원회 2004 한국관개배수논문집 Vol.11 No.2

종이성형구조물의 휨강성에 대한 실험적 연구

박종민,이명훈,Park, Jong-Min,Lee, Myung-Hoon 한국포장학회 1999 한국포장학회지 Vol.5 No.2

Top-to-bottom compression strength of corrugated fiberboard boxes is partly dependent on the load-carrying ability of the central panel areas. The ability of these central areas to resist bending under load will increase the stacking strength of the box. The difference of box compression strengths, among boxes which are made with identical dimensions and fabricated with same components but different flute sizes, is primarily due to difference of the flexural stiffness of the box panels. Top-to-bottom compression strength of a box is accurately predicted by flexural stiffness measurements and the edge crush test of the combined boards. This study was rallied out to analyze the flexural stiffness, maximum bending force and maximum deflection for various corrugated fiber-boards by experimental investigation. There were significant differences between the machine direction (MD) and the cross-machine direction (CD) of corrugated fiberboards tested. It was about 50% in SW and DW, and $62%{\sim}74%$ in dual-medium corrugated fiberboards(e.g. DM, DMA and DMB), respectively. There were no significant differences of maximum deflection in machine direction among the tested fiberboards but, in cross direction, DM showed the highest value and followed by SW, DMA, DMB and DW in order. For the corrugated fiberboards tested, flexural stiffness in machine direction is about $29%{\sim}48%$ larger than cross direction, and difference of flexural stiffness between the two direction is the lowest in DMA and DMB.

마이크로솔더링을 이용한 정전류다이오드 회로 자외선 LED 광원모듈 제작

박종민,유순재,카완 안일,Park, Jong-Min,Yu, Soon Jae,Kawan, Anil 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.4

The improvement of irradiation intensity and irradiation uniformity is essential for large area and high power UVA light source application. In this study, large number of chips bonded by micro soldering technique were driven by low current, and current limiting diodes were configured to supply constant current to parallel circuits consisting of large number of series strings. The dimension of light source module circuit board was $350{\times}90mm^2$ and 16,650 numbers of 385 nm flip chip LEDs were used with a configuration of 90 parallel and 185 series strings. The space between LEDs in parallel and series strings were maintained at 1.9 mm and 1.0 mm distance, respectively. The size of the flip chip was $750{\times}750{\mu}m^2$ were used with contact pads of $260{\times}669{\mu}m^2$ size, and SAC (96.5 Sn/3.0 Ag/0.5 Cu) solder was used for flip chip bonding. The fabricated light source module with 7.5 m A supply current showed temperature rise of $66^{\circ}C$, whereas irradiation was measured to be $300mW/cm^2$. Inaddition, 0.23% variation of the constant current in each series string was demonstrated.