最大 엔트로피方法에 의한 스펙트럼 推定에 관한 小考

朴恩珍,韓相大,片宗根 명지대학교 공학기술연구소 1992 공학기술연구소 논문집 Vol.7 No.-

The method of maximum entropy is reviewed with emphasis on its relationship to entropy rate, filters, autoregressive processes, extrapolation, the Levinson algorithm and stability. The prupose of this paper is an attempt to explain the interconnection of above topics starting from principles. The effectiveness of this method in the solution of specific problems will not be considered here. This paper is essentially heuristic and main references are A. Papoulis' paper(1981) and text(1991).

좌심실 수축기 기능장애를 동반한 양수색전증 1예

박대균,홍경순,두영철,한규록,오동진,유규형,임종윤,고영박,이광학,이영,송원근,김현태 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.8

SOI를 이용한 마하젠더형 열 광학 변조기

박재만,박종대 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

A thermo-optic Mach-Zehnder interferometer modulator based on SOI(silicon on insulator) that is fabricated. At the wavelength of 1.55㎛, on-off ratio of 18.5dB is achieved with switching power of 261mW.

Silicon on Insulator(SOl)를 이용한 광 도파로 소자 설계

박재만,박종대 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-

Asymmetric 1×2 rib waveguide and Mach-Zehnder rib waveguide in SOI are simulated by effective index and BPM. It is shown that the proposed waveguides have low crosstalk and high output power at the 1.55μm wavelength. Further more, the simulation data was obtained that asymmetric 1×2 rib waveguide using SOI satisfied over crosstalk of 30dB and the ratio of output to input power satisfied over 99% powers for Mach-Zehnder rib waveguide using SOI.

METRx™ 기구를 이용한 후방 경추부 추궁추간공 제거술의 예비 결과

박형천,윤승환,박종운,하윤,현동근,김은영,박현선,임대철 대한척추신경외과학회 2004 Neurospine Vol.1 No.1

Objectives: Posterior cervical microscopic laminoforaminotomy has been a preferred procedure for a posterolateral cervical disc or foraminal stenosis. However, neckpain from wide skin incision and muscle injury are some of disadvantages. The authors performed cervical microscopic laminoforaminotomy with METRx™ tubular dilator system and were compared the results with classical cervical microscopic foraminotomy. Methods: Six patients underwent posterior cervical microscopic laminoforaminotomy using the METRx™ during 6 months. We have selected 10 patients from our institution as a comparison group. Preoperative and postoperative pain score composed of the radicular and neck component was examined and disability score also recorded. Diameters and lengths of laminoforaminotomy on the postoperative CT also were compared with two methods Results: Postoperative pain scores to the radiculopathies were not different but postoperative pain scores to the neckpain on the follow up periods were significantly different. The average vertical and transverse diameters of the laminoforaminotomy defect on the postoperative CT scans were not different between two groups. Average hospital stay of the classical methods was 8.8±7.5 days comparison with 4.5±0.54days of new procedure. Conclusions: Posterior cervical microscopic laminoforaminotomy with METRx™ systems seems to provide similar decompression and clinical results as classical methods compared to classical methods and shows superior results for postoperative neckpain and hospital stays.

SOI를 이용한 비대칭 Y분기 열 광학 스위치

박재만,박종대 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

Asymmetric 1×2 Thermo-Optical waveguid Switch based on SOI are simulated by effective index and BPM. It is shown that the proposed switch have low crosstalk at the 1.55 ㎛ wavelength. The measured data was obtained that Asymmetric 1×2 rib Thermo-Optical waveguide Switch based on SOI satisfies over crosstalk of 22dB (TE) and 20dB (TM)

좌심실 장축 운동의 기능적 의의 (Ⅰ)

박종훈,전은석,구대회 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.2

To assess the functional significance of long axis movement which would reflect the fiber orientation of the ventricular muscle, we examined the mitral annulus motion and compared it with standard minor axis movement. M-mode echocardiogram were performed in 24 healthy individuals and 17 mitral valve replaced (MVR) patients with simultaneous EKG and phonocardiogram recordings. The results were as follows : 1. In the controls, the onset of shortening of long axis preceeds that of minor axis (phase difference : 20±3msec, mean± SEM) but in MVR patients this phase difference was reversed (-33±8msec). It means that the spherical shape changes which can be observed in normal controls during isovolumic contraction period were lost in MVR patients. 2. In MVR patients, the time intervals from A2 to the end of shortening of long axis were significantly delayed compared with normal controls (54±3 VS 90±8 msec, P<0.01). 3. In MVR patients, the delayed shortening of long axis was observed in amplitude as well as in time. In summary. we observed the regional nonuniformity between long axis and short axis in normal control and interpreted that it could play a role in modulating ventricular function which was lost in MVR patients.

아연계 탈황제의 장기연속 반응성 연구

박노국,이종욱,이승철,이종대,류시옥,이태진 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2

The zinc titanate sorbents(ZTG40) were prepared and the tests for durability and attrition resistance were carried out to develop the highly effective desulfurization sorbents. In the attrition tests for ZTG40 the results showed that the attrition resistance was 94.08% and that the sulfur capacity was maintained above 15g S/100g sorbent throughout the 100-cycle test, its maximum being 23.05g S/100g sorbent. As compared to sorbents developed by the developed countries, ZTG40 showed superior performances. In the advanced countries 15g S/100g sorbent is a yardstick of excellency for the sulfur capacity of desulfurization sorbents. Therefore, ZTG40 developed in this study has the desirable physical and chemical properties for fluidized desulfurization of coal gases.

Effect of Dietary Monascus Pigment on the Liver Damage Induced with CCI₄in Rats

윤종국,--,--,--,-- THE KOREAN SOCIETY FOR BIOMEDICAL LABORATORY SCIEN 2003 Journal of biomedical laboratory sciences Vol.9 No.3

In the biological world, there are a number of ecological fights for survival between each organism such as plants, animals and microorganism. In such events, an organism can use its natural bioactive products as defence agent against other organism. Furthermore, natural bioactive products can be utilized for medicine or functional food. Recently, we investigate the effect of Monascus pigment extracted from a fungus, Monascus anke, on the alcohol metabolism and blood lipid profile. In the present study, it is observed that Monascus pigment supplemented dietary may have a hepatoprotective effect on rat's liver damage induced with CCl₄. By treatment with CCl₄(3 times, I.P), liver damage was reduced more in the rats fed 2% Monascus pigment extract supplemented diet than those fed standard diet, based on the serum levels of alanine aminotransferase, microsomal glucose-6-phosphatse activity and hepaic malondialdehyde content. On the other hand, oxygen free radical generating enzymes, hepatic P-450 dependent aniline hydroxylase, xanthine oxidase, and oxygen free radical scavenging enzymes, hepatic glutathione S-transferase, catalase, superoxide dismutase activities were generally higher both in CCl₄, treated group and control fed 2% Monascus pigment extract supplemented diet than those fed standard diet. In conclusion, the rats fed 2% Monascus pigment extract supplemented diet showed more reduced liver damage than those fed standard diet, which may be due to the acceleration of oxygen free radical metabolism.

다발성 대장암 간전이 환자의 간절제를 위한 새로운 시도

주종우,김형철,임철완,신응진,조규석,유기원,송옥평,홍대식,박성진,조준희,이혜경,김희경,권계원,고은석 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Multiple bilobar liver matastases (MBLM) are the main cause of low resectability in the colon cancer liver metastases. The authors experienced one case of initially non-resectable colon cancer liver metastases. He was curatively and safely treated with a two-stage hepatectomy using the new method of future remnant liver volume growing. A 54-year-old man was referred to our department with the sigmoid colon cancer combined with MBLM, which were checked in two small metastatic lesions in the left lobe and five large sized lesions in the right lobe in the computed tomogram (CT). A laparoscopic assisted anterior resection was primarily performed. We performed the 1^(st) stage hepatectomy 3 weeks after the colon resection. Intra-operative Ultrasonogram (US) found 9 small superficial metastatic lesions in the left lobe. All that lesions were completely removed by non-anatomical wedge resection. An occlusion ballon catheter was placed in the right portal vein through a small branch of the inferior mesenteric vein at that time. The future remnant liver volume was sufficiently increased 3 weeks after the 1^(st) hepatectomy. A right hepatectomy was safely performed 22 days after the 1^(st) hepatectomy. The patient received a regional chemotherapy (interleukin2 based immuno-chemotherapy through hepatic artery) for 4 months, then received 9 cycles of systemic chemotherapy (biweekly Oxaliplation, leucovorin, plus 5-fluorouracil) without any recurrence evidence.