혈액 투석 환자에서 중심정맥 협착에 대한 스텐트 삽입술 : Wallstent Placement

임대승,노상필,이유선,정승현,김보영,이정우,강정아,김정희,이민수,정준용,최시완,정진옥,성인환,이강욱,신영태 충남대학교 의과대학 의학연구소 2002 충남의대잡지 Vol.29 No.1

Stenosis of central vein is a common complication arising after percutaneous subclavian vein catheter insertion performed for temporary vascular access in chronic renal failure patients undergoing hemodialysis. There are several treatment methods for the condition like percutaneous angioplasty(PTA), stent insertion, and surgery, but recent trend is toward PTA and stents. Among the patients diagnosed with chronic renal failure from March 1993 to May 2002 and undergoing hemodialysis through AV fistula, the 14 Patients in whom central vein stenosis arose were selected for the study. A total of 28 percutaneous interventions(5 PTA and 23 stent placement) were performed, and restenosis rate and the time taken till the restenosis in de novo lesions and instant lesions were compared. All 28 cases were operated successfully. The 14 cases that received both anigioplasty and stent placement initially. (de novo lesion : 14 cases), Among the 10 cases with de novo lesion that followed up more than 1 year, 3 cases are currently undergoing hemodialysis without restenosis, and the remaining 7 cases have recurred stenosis with the mean time to restenosis of 10.9 months. In the 7 cases in whom stenosis recurred, 11 interventions were done(instent lesion: 11 cases). 4 of these were using only ballon angioplasty with 100% restenosis rate and the mean time of 3 months until restenosis. The remaining 7 cases were using both balloon angioplasty and stent placement, also with 100% restenosis rate but with the mean time of 12 months until restenosis, which was later than the group receiving only balloon angioplasty. In treating the patients with central vein stenosis, stent placement seems to be more advantageous over PTA in terms of restenosis rate and the mean duration of patency. In the case of instent lesion, inserting the stent for the second time after stenosis recurred lengthened the duration of patency compared to performing balloon angioplasty alone.

아몰퍼스 자성박대의 자기센서 응용에 관한 연구

金大柱,林在根,金玄郁,愼鏞鎭 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-

In this thesis, we have described about application of amorphous magnetic ribbon of FeCoSiB compound to magnetic sensing device. As the samples of our experiment, we used a near zero-magnetostrictive amorphous magnetic ribbon of (Fe0.06Co0.94)79Si2.1B18.9 composition with its thickness of 26[㎛], its length of 5[㎝] and its width of 2[㎜], which was fabricated by rapidly quenching method. In order to improve the magnetic properties of the samples, we annealed them under magnetic field where the range of the crystallization temperature Tx and the Curie temperature Tc were 300~400[℃]. Then, by measuring them with X-ray diffraction(XRD) and vibrating sample megnetometer(VSM) analysis method. we found Tx≒451[℃] and Tc≒441[℃]. From the hysteresis curve of the finally annealed sample ribbon, we found the Large Bakhausen Jump(LBJ) effect at the reversal magnetization field Hw≒0.5[Oe]. This LBJ effect was also observed at the variation of the magnetic domain in the process of magnetization. Thus, it is proved that the amorphous magnetic ribbon of FeCoSiB compound can be use as a magnetic sensing device.

SCM415강의 침탄 표면처리 공정과 기계적 성질

김대욱,김문진,임병수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.2

The influence of plasma carburizing process on the surface hardness of SCM415 low-alloy steel (0.15% C) was investigated under the various process conditions of gas composition, gas pressure, plasma current density, temperature and time. The effective case depth was found to depend on the amount of methan gas containing carbon, thus the deepest case depth and the uniformity of hardeness were obtained under the 100% methan gas condition. The case depth increased with the higher plasma current density which could be increased in the higher gas pressure, because the surface carbon content depends on plasma current density. The effective plasma carburizing temperature of SCM415 steel was found to be higher than 850℃, and the case depth was proportional to the square root of carburizing time under the same current density. The bending fatigue strength of plasma carburized specimen is higher than those of as-received specimen and reheat-quenched specimen. High cycle fatigue and dry wear characteristics of vacuum carburized low alloy steel, SCM415(0.15% C), were evaluated after various heat treatments including direct quenching, single reheat quenching and sub-zero treatment. Comparing the fatigue and wear characteristics of carburized specimens to those of hot annealed or reheat quenched specimens, the wear resistant property as well as bending fatigue limits of vacuum carburized steels were substantially superior to other heat treated steels. Test results indicated that the carburized and reheat treated specimens have higher fatigue limits than the carburized and direct-quenched specimens and the specimens followed by sub-zero treatment. The wear volumes of sub-zero treated specimens with higher surface hardness show slightly lower values than those of non sub-zero treated specimens. This is attributed to the reduction of retained austenite amount of the surface and an increase of surface hardness by the sub-zero treatment effect.

포스트-텐션 프리캐스트 외부 넓은 보-기둥 접합부의 비탄성 거동

박상욱,최윤철,김영찬,김대중,임재형,권기혁,문정호,이리형 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Experimental results from the cycle lateral load tests for post-tensioned precast wide beam-column connections were presented. Six exterior beam-column assemblages of half scale were tested in the laboratory. The specimens consist of U-shaped precast wide beams and concrete columns. The continuity at the beam-column joint is achieved with the topping concrete and post-tensioning. The specimens were designed with parameters of the beam-to-column depth ration and the number of tendons within column core. The test results showed that the post-tensioned precast wide beam-column connection satisfied the provisional standard by ACI of acceptance criteria for concrete special moment frames.

천측두 동맥류 1예

강성호,임대준,김동욱,김보형 건국대학교 의과학연구소 1998 건국의과학학술지 Vol.8 No.-

Superficial temporal artery aneurysm is a rare entity, which is related to blunt trauma. It was diagnosed with history, physical examination and CT or angiography. Aneurysm is simply treated with excision and ligation. We report a case with review of literature.

한국인에서 CC-SIT와 비교한 KVSS Test의 임상적 유용성 평가 : 예비연구 Pilot study

김진국,장현종,임채형,남태욱,심대보 건국대학교 의과학연구소 2003 건국의과학학술지 Vol.13 No.-

Background and Objectives: Sniffin' Sticks test is the test of nasal chemosensory performance based on pen-like odor dispensing devices. KVSS(Korean Version of Sniffin' Sticks) Test was developed as the "Korean olfactory test" using the odorants which are familiar to Korean. Authors evaluated the clinical validity of KVSS Test compared with CC-SIT (Cross-Cultural Smell Identification Test) in Korean. Materials and Methods: The subjects of this study were 25 normosmic volunteers who were divided into five groups according to age. Each group was 5 normosmic volunteers. And they consisted of 12 men and 13 women. KVSS Test and CC-SIT were used for the evaluation of olfactory function. Results: Our study showed the negative correlation between age and olfactory function test (CC-SIT score, KVSS Test I score and KVSS Test II score). Normosmia rate of KVSS Test was more higher than that of CC-SIT. Also KVSS Test had more familiar items for Koreans compared with that of CC-SIT. CC-SIT score and KVSS Test score showed showed the positive corrclation. And each test revealed high reliability in test-retest evaluation. Conclusion: The KVSS Test can be used as an olfactory function test for Koreans.

일개 자동차 부품공장 근로자에서 초음파로 측정한 수근관 형태와 수근관증후군 위험도

김덕수,정해관,임현술,권용욱,이종민,조대현,최대섭 大韓産業醫學會 2002 대한직업환경의학회지 Vol.14 No.3

목적 : 일개 사업장의 생산직 근로자를 대상으로 손목 계측치 및 초음파를 이용한 수근관 계측치의 상관성 분석을 통하여 수근관증후군 발생에 관여하는 개인의 감수성 및 위험요인을 파악하여 생산직 근로자들의 수근관증후군 예방에 활용하고자 본 연구를 수행하였다. 방법 : 경주시에 위치한 자동차 방음재를 생산하는 사업장에 생산직 근로자 남자 24명, 여자 11명 등 총 35명을 대상으로 2000녀 4월과 2000년 10월 반드시 각 설문조사, 이학적검사, 전기진단검사를 실시하였으며, 2000년 10월에는 초음파를 이용한 수근관계측도 실시하였다. 결과 : 수근관증후군의 신체계측 요인에 따른 분석에서는 수근관 전치/폭 비가 0.17 미만인 군에 비하여 0.17 이상인 군에서 통계적으로 유의하게 높았다(p<0.05). 총 수근관 면적(두께×폭)은 300 ㎟이상인 군에 비하여 300㎟ 미만인 군에서 통계적으로 유의하게 높았다(p<0.05). 성별을 통제변수로 처리한 신체 계측치간 상간 분석에서는 수근관폭은 전기진단 검사와 음의 상관성을 보였으며, 수근관 두께는 전기진단 검사와 양의 상관성을 보였다. 수근관 두께/폭 비는 전기진단 검사와 양이 상관성을 보였으며, 수근관비 전치/두께 비는 전기진단 검사 결과와 음의 상관성을 보였다. 하부 수근관 면적[폭×(두께-전치)]은 전기진단 검사와 양의 상관성을 보였으며, 상부 수근관 면적(폭×전치)은 전기진단 검사와 음의 상관성을 보였다. 또한 수근관 전치의 상대적 비가 클수록 수근관증후군의 회복이 유의하게 좋았다. 결론 : 수근관증후군은 수근관 폭이 좁을수록, 수근관 두께가 두꺼울수록, 수근관 전치가 작을수록 수근관증후군 위험도가 증가한다. 저자들은 초음파를 이용한 수근관 형태의 측정은 수근관증후군의 발생의 내적 요인에 대한 중요한 정보를 제공하면 수근관증후군 발생 및 회복의 개별적 위험요인을 예측하는데 중요한 근거를 제공하는 것으로 판단하였다. Objectives: This study was conducted to evaluate individual susceptibility to carpal tunnel syndrome (CTS) by ultrasonographic measurement of the carpal tunnel configuration in workers doing repetitive work. Methods: The study subjects consisted of 24 male and 11 female workers in a soundproof material manufacturing company in Gyeongju. We conducted a self-reported questionnaire survey, a physical examination and an electrodiagnostic study (EDS) in April 2000. After the examination, jobs were rearranged for workers with CTS. A follow up physical examination. EDS, and measurement of the carpal tunnel by ultrasonography was done six monsths later. Results: Of those studied. prevalence or CTS was 63.6/100 persons among women and 29.2/100 persons among men. Mean depth and width of wrist was shorter in those with CTS compareal to the controls (p<0.05). The risk of CTS was higher in workers whose carpal tunnel ratio (displacement/width) was 0.17 or higher (OR 7.13, 95% confidence interval 1.18-43.1), and in workers whose carpal tunnel area was less than 300 ㎟ (OR 8.00, 95% confidence interval 1.18-68.5). Carpal tunnel depth and depth/width ratio had a positive correlation with motor latency of the median nerve and median-ulnar sensory latency difference (p<0.05). whereas the carpal tunnel width. displacement/depth ratio, and area (width×displacement) had a negative correlation with median nerve latencies after adjusting for gender. Workers who showed an improvement in the clinical stage of CTS after job rearrangement had a significantly lower carpal tunnel displacement/width ratio and displacement/depth ratio. They also had smaller upper carpal tunnel area (width×displacement) and larger upper carpal tunner\l area [(depth-displacement)×width] than the controls (p<0.05). Conclusions:Ultrasonographic measurement of the carpal tunnel is a good predictor of susceptibility and prognosis of CTS in workers doing repetivive work.

MF 주파수대역 무선전력전송에서 매칭회로타입에 따른 매칭특성에 대한 연구

김대욱(Dae-Wook Kim),양대기(Dae-Ki Yang),안영오(Young-Oh An),임은석(Eun-Suk Lim),최상돈(Sang-Don Choi),최대규(Dae-Kyu Choi),정윤도(Yoon-Do Chung) 전력전자학회 2014 전력전자학술대회 논문집 Vol.2014 No.7

가변 임피던스 정합기를 이용한 전자기유도방식의 무선전력전송에서의 최적전송에 대한 연구

김대욱(Dae-Wook Kim),임은석(Eun-Suk Lim),최상돈(Sang-Don Choi),이종식(Jong-Sik Lee),최대규(Dae-Kyu Choi),정윤도(Yoon-Do Chung) 전력전자학회 2013 전력전자학술대회 논문집 Vol.2013 No.7

Determination of Malignant and Invasive Predictors in Branch Duct Type Intraductal Papillary Mucinous Neoplasms of the Pancreas: A Suggested Scoring Formula

Hwang, Dae Wook,Jang, Jin-Young,Lim, Chang-Sup,Lee, Seung Eun,Yoon, Yoo-Seok,Ahn, Young Joon,Han, Ho-Seong,Kim, Sun-Whe,Kim, Sang Geol,Yun, Young Kook,Han, Seong-Sik,Park, Sang-Jae,Lim, Tae Jin,Kang, The Korean Academy of Medical Sciences 2011 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.26 No.6

<P>Prediction of malignancy or invasiveness of branch duct type intraductal papillary mucinous neoplasm (Br-IPMN) is difficult, and proper treatment strategy has not been well established. The authors investigated the characteristics of Br-IPMN and explored its malignancy or invasiveness predicting factors to suggest a scoring formula for predicting pathologic results. From 1994 to 2008, 237 patients who were diagnosed as Br-IPMN at 11 tertiary referral centers in Korea were retrospectively reviewed. The patients' mean age was 63.1 ± 9.2 yr. One hundred ninty-eight (83.5%) patients had nonmalignant IPMN (81 adenoma, 117 borderline atypia), and 39 (16.5%) had malignant IPMN (13 carcinoma in situ, 26 invasive carcinoma). Cyst size and mural nodule were malignancy determining factors by multivariate analysis. Elevated CEA, cyst size and mural nodule were factors determining invasiveness by multivariate analysis. Using the regression coefficient for significant predictors on multivariate analysis, we constructed a malignancy-predicting scoring formula: 22.4 (mural nodule [0 or 1]) + 0.5 (cyst size [mm]). In invasive IPMN, the formula was expressed as invasiveness-predicting score = 36.6 (mural nodule [0 or 1]) + 32.2 (elevated serum CEA [0 or 1]) + 0.6 (cyst size [mm]). Here we present a scoring formula for prediction of malignancy or invasiveness of Br-IPMN which can be used to determine a proper treatment strategy.</P>