방사선 조사를 받은 두경부 병소의 재건을 위한 유리피판술

채수욱,고경석,김주봉,박상훈,한상훈,이택종,남순열,김상윤 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.3

Radiation therapy is an effective cancer treatment modality as a primary treatment in early cancer and as an adjuvant treatment in advanced cancer, especially in head and neck lesions, but it also causes irreversible chronic damages to overlying normal tissues that may lead to wound complications. As well, at the microscopic level, radiation injury causes both stasis and occlusion of small vessels. Therefore, surgical reconstruction of previously-irradiated lesions in the head and neck poses a great problem. Fifth-six patients with head and neck lesions underwent 57 microsurgical reconstructions between 1990-1998. Thirteen patients were irradiated before surgery. The previous radiation dose was 30∼75.6 Gy. The free tissue transfer was successful in 52 of the 57 microsurgical reconstructions(91.2%). The success rate was 92.3%(12/13) in previously-irradiated patients and 90.9%(40/44) in nonirradiated patients. Postoperative complications, such as flap loss, fistula, and infection, developed in 4 irradiated patients and 8 nonirradiated patients. Overall complication rate was 30.8%(4/13) in previously-irradiated patients and 18.2%(8/44) in nonirradiated patients. Although the failure rate of previously-irradiated patients was higher than that of nonirradiated patients, there was no statistically significant difference between them. Thus, free tissue transfers in patients with previously-irradiated head and neck lesions are suitable for one-stage reconstruction.

급성 림프구성 백혈병 환자에서 발생한 침습성 국균 심내막염 2예

신성철,백경란,정재홍,송봉근,김동희,전경만,채제욱,손준성,정숙인,오원섭,송재훈 대한감염학회 2003 감염과 화학요법 Vol.35 No.5

국균은 호흡기를 통해 유입되며 심한 면역기능저하 환자에서 기회감염을 일으키는 진균이며 주로 혈관을 따라 폐를 침범하고 심장과 골침범은 매우 드문 것으로 알려져 있다. 저자들은 급성 림프구성 백혈병 환자에서 발생한 침습성 국균 심내막염을 2예을 경험하였다. 19세 남자환자로 동종 조혈모세포이식 후 발생한 고열과 요통의 원인으로 감염성 심내막염 진단하에 수술결과 국균에 의한 감염으로 확증되어 수술적 절제술과 liposomal amphotericin B로 치료하였으나 국균 심내막염의 재발과 국균 척추염의 악화, 뇌 출혈로 사망하였다. 23세 남자환자로 관해요법 후 발생한 고열과 요통의 원인으로 국균 심내막염과 국균 척추염 진단하에 수술적 절제술과 amphotericin B로 치료하여 1년 2개월 동안 국균 심내막염의 재발은 없었으나 지속적인 백혈병의 재발과 국균 척추염의 악화, 침습성 폐 국균증으로 사망하였다. Although Aspergillus endocarditis has rarely been reported, it can cause fatal complications in hematologic malignancy patients and allogeneic stem cell transplant recipients. We experienced two cases of aspergillus endocarditis developed in acute lymphoblastic leukemia patients. Case; A 19-year-old patient developed Aspergillus endocarditis after allogenic hemopoietic stem cell transplantation. He was treated with surgical intervention and liposomal amphotericin B. He died of recurred Aspergillus endocarditis and cerebral hemorrhage probably related with aspergillosis of central nervous system. Case 2; A 23-year-old patient developed invasive Aspergillus endocarditis after induction chemotherapy. Aspergillus endocarditis was successfully treated by surgical intervention and amphotericin B. He died of refractory neutropenic fever and sepsis after the third relapse of leukemia and repetitive chemotherapy. He probably had invasive pulmonary aspergillosis without evidence of endocarditis recurrence. Because the mortality of Aspergillus endocarditis is very high, early diagnosis and surgical intervention are very important for better outcome.

플라즈마 표지소자의 제작

이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-

An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.

Spin-Peierls 전이를 하는 CuGeO₃계의 이온 치환 효과

이영배,채광표,권우현,백서욱,이성호 건국대학교 자연과학연구소 1998 建國自然科學硏究誌 Vol.9 No.1

Spin-Peierls 전이를 하는 CuGeO₃계에 원소를 치환했을 때의 자기적 및 결정학적 특성을 비교 검토하고, 직접 Cu₁-xGe₁-xFe₂O₃(x=0.05, 0.1) 시료를 제조하여 SQUID, Mssbauer 분광기, X-선 회절 방법으로 연구하였다. 이 시료의 결정구조는 orthorhombic 이고 격자 상수는 x= 0.05 때 a = 4.795Å, b=8.472Å, c=2.904Å 이고 x=0.1때는 a=4.784Å, b=8.472Å, c=2.904Å였다. 상온에서 Mssbauer 스펙트럼은 Fe³+ 이온의 사면체 자리에 의한 이중선과 팔면체 자리에 의한 Zeeman 선으로 중첩되어 나타났고 자기감수율의 극대점과 Mssbauer 변수의 불연속으로부터 본 시료의 spin-Peierls 전이 온도는 13K 임을 알아냈다. The magnetic and crystallograpic properties of the substituted spin-Peierls transition CuGeO₃ system have been reviewed, and we synthesized the Cu₁-xGe₁-xFe₂xO₃ (x=0.05 and x=0.1) system and studied by superconducting quantum interference device, Mossbauer spectrometer and x-ray diffractometer. The crystal structure is orthorhombic and the lattice constants are decreased as increasing iron contents. That is, in Cu₁-xGe₁-xFe₂xO₃ system a=4.795Å, b=8.472Å and c=2.932Å for x=0.05, and a=4.784Å, b=8.472Å and c=2.904Å for x=0.1 respectively. The Mossbauer spectra are superposition of the doublet due to the Fe³+ ions at tetrahedral sites and the sextet due to the Fe³+ ions at octahedral sites at room temperature. From the cusp of the magnetic susceptibility and the discontinuity of Mossbauer parameters we found the spin-Peierls transition temperature of our samples is 13K.

유도 허벅다리걸기 기술발휘 시 받기의 자세와 저항수준에 따른 중심변인 분석 사례연구(Ⅱ)

김의환,김성섭,정재욱 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1

E. H. KIM, S. S. KIM, C. W. CHUNG. A Case Study on Center of Gravity Analysis when Performing ilchimata by Posture and Voluntary Resistance Levels of Uke in Judo[ II]. Korean Journal of Sport Biomechanics, Vol. 15, No. 1, pp. 237.-257, 2005. It was to study as a following-research of "A Case Study on Center of Gravity(COG) Analysis when Performing Uchimata(inner thigh reaping throw) by Posture and Voluntary Resistance Levels(VRL) of Like in Judo[1]". The purpose of this study was to analyze the COG variables when performing uchimata(inner thigh reaping throw) by two postures and voluntary resistance Jevels(VRL) of uke(reciver) in Judo. The subjects, who were one male judoka(YH) for 1992 Barcelona Olympic Games Olympian(silver medalist), and one male trainee; Y.I.University representative member (SDK), and were filmed on two S-VHS 16mm video cameras(60fields/sec.) through 3-dimensional motion analysis methods, that postures of uke were shizenhontai (straight natural posture) and jigohontai(straight defensive posture), VRL of uke were 0% and 100%, respectively. The kinematical variable was COG variable, distance of COG, and distance of resultant COG between uke and tori(the thrower), velocity and acceleration of COG. The data of this study collection were digitized by SIMI Motion Program computed the mean values and the standard deviation calculated for each variables. When performing uchinwta according to each posture and VRL of uke and classifying. From the data analysis and discussion, the conclusions were as follows : 1. Displacement of COG Subject YH, COG was the highest in kuzushi(balance -breaking), vertical COG was low when following in tsukuri(positioning; set-up), kake(application; execution), and COG was pattern of same character each postures and resistance, respectively. Subject SDK, COG was low from kumikata(engagement positioning) to kake, and COG was that each postures and resistance were same patterns, respectively. Subject YH, SDK, each individual, postures and resistance, vertical COG was the lowest in kake phase, when performing. 2. Distance of COG between uke and tori The distance of COG between uke and tori when performing, subject YH was 0.64-0.70cm in kumikata, 0.19-0.28cm in kake, and SDK was 0.68-0.72cm in kumikata, 0.30-0.42 cm in kake. SDK was wider than YH. 3. Distance of resultant COG between uke and tori The distance of resultant COG between uke and tori when performing, subject YH was 0.27-0.73cm from kumikata to kake. and SDK was 0.14-0.34cm in kumikata, 0.28- 0.65cm in kake. Jigohontai(YH:0.43-0.73cm,SDK:0.59-0.65cm) was more moved than shizenhontai(YH:0.27-0.53cm, SDK: 0.28- 0.34cm). 4. Velocity of COG The velocity of COG when performing uchimata, subject YH was fast anterior-posterior direction in kuzushi, ant-post. and vertical direction fast in tsukuri and kake. SDK was lateral, ant.-post. and vertical direction in kuzushi, ant.-post. and vertical direction in tsukuri and ant.-post. direction in kake, respectively. 5. Acceleration of COG The acceleration of COG when performing uchimata, The trend of subject YH was showed fast vertical direction in kuzushi and tsukuri, ant-post. and vertical direction fast in kake. The trends of SDK showed lateral direction in kuzushi, lateral and ant.-post. direction in tsukuri and ant.-post direction in kake, respectively.

GIS를 이용한 네트워크 최적화 시스템 구축

박찬규,이상욱,박순달,성기석,진희채 한국경영과학회 2000 經營 科學 Vol.17 No.1

By managing not only geographical information but also various kinds of attribute date, GIS presents useful information for decision-makings Most of decision-making problems using GIS can be formulated into network-optimization problems in this study, we deal with the implementation of network optimization system that extracts data from the database in GIS, solves a network optimization problems, and present optimal solutions through GIS' graphical user interface We design a network optimization system, and present some implementation techniques by showing a prototype of the network optimization system Our network optimization system consists of three components the interface module for user and GIS, the basic network optimization program module, the advanced network optimization program module To handle large-scale networks, the program module including various techniques for large sparse networks is also considered For the implementation of the network optimization system, we consider two approaches the method using script languages supported by GIS, and the method using client tools of GIS Finally, some execution results displayed by the prototype version of network optimization system are given

유도 측방낙법의 운동학적 변인 특성분석

김의환,김성섭,정재욱 龍仁大學校 武道硏究所 2004 武道硏究所誌 Vol.14 No.2

The purpose of this study was to analyze the traits of the kinematical variables of Yoko ukemi(side breakfall) in Judo, when performing judoists. The subjects were four male judokas who were trainees Y. University Squad members and were filmed on two S-VHS 16㎜ video cameras (60fields/sec.) The kinematical variables were temporal and COG variables. The data of this study collection were digitized by KWON3D program computed the mean values and the standard deviation calculated for each variables. From the data analysis and discussion, the conclusions were as follows: When performing Yoko ukemi(side breakfall) in Jigo hontai(straight defensive posture): 1. Temporal variables, in the time required(TR) by phase, the first phase (take off phase average 0.77sec.) showed the longest time, and the next was the third phase (ukmi phase, 0.46sec.), the second phase(air phase, average 0.19sec.), and the total TR 1.42sec.(±0.13). 2. The body part touched order and TR by the mal were hip (0.98sec.) showed the shortest time, and the next was elbow (0.99sec.), hand(1.01sec.), back(1.01sec.), order, etc. respectively. We know motions that the hip part touched on the mat the first, but before receiving impact, using by arm, and touching by the palm of the hand more strong. 3. Posture variables, vertical COG variable in each event el(ready position 0.98cm) moved the highest, and the next was e2(jumping position, 69.70cm), e3(transition position, 62.42cm), e4(landing position, 40.05cm), and e5(ukemi position, 18.55cm), gradual decrease respectively.

치과용 자성 어태치먼트 재료의 안정성 개선에 관한 연구 : II.질화티타늄 코팅이 치과용 자성재의 내식성에 미치는 영향 Ⅱ.Effect of TiN Coating on Corrosion Resistance of Dental Magnetic Materials

최한철,고영무,정재헌,신종연,김일선,최성욱,정효수 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.4

Dental magnetic materials have been applied to removable prosthetic appliances, maxillofacial prostheses, obturator and dental implant but they still have some problems such as low corrosion resistance in oral environments. To increase the corrosion resistance of dental magnetic materials, surfaces of Sm-Co and Nd-Fe-B based magnetic materials were plated with TiN and then electrochemical corrosion test were performed in 4 kinds of electrolyte solutions(0.9% NaCl. 1% lactic acid, 0.05% HCl and modified Fusayama's artificial saliva). From this study, corrosion behavior, amount of elements released, mean average surface roughness values and the changing of mean surface microhardness values were measured comparing with control group of non-sputtered plating magnetic materials. The results were as follows: 1. TiN layer coated on magnet grows into preferred direction with lamellar structure and its thickness is 3.0㎛. 2. Sm-Co base magnetic materials coated with TiN have good corrosion resistance in 1% lactic acid and their pitting corrosion can not be seen. 3. Nd-Fe-B base magnetic materials coated with TiN showed good tendency of corrosion resistance in 0.05% HCl solution. 4. The amount of elements released from both Sm-Co and Nd-Fe-B base magnetic materials coated with TiN were more significantly decreased than that of uncoated magnetic materials. 5. The mean surface roughness values of both Sm-Co and Nd-Fe-B base magnetic materials coated with TiN were smooth than that of uncoated magnetic materials after corrosion test. 6. The decreasing rate of microhardness of both Sm-Co and Nd-Fe-B base magnetic materials coated with TiN were lower than that of uncoated magnetic materials after corrosion test. 7. Dental magnetic materials coated with TiN produced various corrosion products such as TiO, TiO₂, Ti₂O₃on the surface and resulted in better corrosion resistance than uncoated magnetic materials. In conclusion, it is considered that the corrosion problem of dental magnetic materials could be solved to some extent by EB-PVD with TiN on the surface of dental magnetic materials.

치과용 자성재의 안정성 개선에 관한 연구 : I. 치과용 자성재의 전기화학적 부식에 대한 스퍼터링 도금의 효과 I. Effects of Sputtered Film Deposition on the Electrochemical Corrosion of Dental Magnetic Materials

고영무,최한철,정재헌,정효수,최성욱 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.4

In order to investigate the various properties of dental magnetic materials studies on corrosion behavior, decreasing rate of magnetic flux density, amount of elements released, mean average surface roughness values and the changing of mean surface microhardness values for dental application were done. To increasing the corrosion resistance of dental magnetic materials, surfaces of Sm-Co and Nd-Fe-B based magnetic materials were plated with gold(Au), platinum(Pt), titanium(Ti), chromium(Cr) and cobalt(Co), and then electrochemical corrosion test were performed in 4 kinds of electrolyte solution(0.9% NaCl, 1% lactic acid, 0.05% HCl and modified Fusayama's artificial saliva). The results were as follows: 1. In Sm-Co and Nd-Fe-B based magnetic materials, the pitting corrosion of experimental group was higher than that of the control group, the experimental group was less corrosive than control hroup. 2. The amount of elements released from experimental group was more significantly decreased than that of control group. 3. Decreasing rate of magnetic flux density of experimental groups was significantly lower than that of control group after corrosion test. 4. The mean average surface roughness value of one(Sm-Co based magnetic materials not plated) of the control group was much increased in modified Fusayama's artificial saliva after first corrosion but that of the other(Nd-Fe-B based magnetic materials not plated) was much increased in 0.05% HCl solution. 5. The decreasing rate of surface microhardness values of experimental groups were lower than that of control group after corrosion, 6. Intergranular corrosion started first from the grain boundary of the control group and they advanced gradually to general corrosion, and the pitting corrosion occurred locally at area of existing pits in experimental group.

씨름 들배지기 기술의 키네메틱 특성분석

김의환,홍장표,우성돈,정재욱 龍仁大學校 武道硏究所 2001 武道硏究所誌 Vol.12 No.1

The purpose of this study was to analyze the kinematic variables Dul-baejiki, the most frequently used and crucial technique in Ssireum(Korean Traditional Westling) with 3dimensional analysis technique and show the kinematic characteristics of it. The subjects of this experiment were two best skilled players who have been plying in professional Ssireum team and whose weights are over 100kg(subject A) and under 100kg(subject B) each. Kinematic variables analyzed here include time, posture, and center of gravity. The mean values and the standard deviations for each variables were variables were obtained and used as basic factors for examing characteristics of Dul-baejiki motion From the data analysis discussion, the following conclusions were drawn: 1) Temporal variables The average time elapsed(TE) by phases of Dul-baejuki motion are the following. For subject A(over 100kg), TE during 1st phase was 0.69 sec(53.5%), TE during 2nd phase was 0.44 sec(34.1%), TE during 3rd phase was 0.16 sec(12.4%). For subject B(under 100kg), TE during 1st phase was 0.69 sec(55.6%). TE during 2nd phase was 0.36 sec(29.1%), TE during 3rd phase was 0.19 sec(15.3%). In the TE by phases of both subjects, the longest TE was the 1st phase, next the 2nd phase, and then the 3rd phase. 2) Center of Gravity(COG) variables Frontal Plane for both subjects showed a continuous movement rightward from pulling phase to falling phase. For Sagital Plane, subject Q moved backward in pulling phase, but subject B moved 6 cm forward until falling phase and then moved backward. For Height, subject A was situated 87.3 cm ∼106.7 cm high from the mat from initial phase throughout falling phase, subject B was situated 75 cm ∼97.1 cm.