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.

치과용 콤포짓트 레진의 수분 흡수에 따른 압축강도와 굴곡강도의 변화에 관한 연구

정내정,김정욱,이상훈 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.1

콤포짓트 레진의 다양한 성분은 기계적 성질에 많은 영향을 미치고, 수복물 주위의 환경 또한 재료의 성질에 많은 영향을 줄 수 있다. 구강 내에서 수복된 콤포짓트 레진은 항상 수분에 노출되어 있고, 콤포짓트 레진의 매트릭스는 수분을 흡수할 수 있으므로, 그 결과 콤포짓트 레진은 팽창하게 된다. 또한 콤포짓트 레진의 수분 흡수가 표면강도와 마모저항의 저하와 관계된다고 알려져 있는바 저자는 치과용 콤포짓트 레진의 수분 흡수에 따른 압축강도와 굴곡강도의 변화에 관하여 알아보고자 하였다. 재료는 1군을 Z-100(3M, U.S.A.), 2군을 Spectrum(Dentsply, U.S.A.), 3군을 Clearfil AP-X(Kuraray, Japan), 4군을 Pyramid(Bisco, U.S.A), 5군을 Heliomolar(Vivadent, Germany)로 나누어 7일, 30일, 60일, 120일간 증류수에 넣어 37℃에서 보관한 후 Instron 6022(Instron, U.K.)를 이용하여 압축강도와 굴곡강도를 측정하여 다음과 같은 결과를 얻었다. 1.7일, 30일, 60일, 120일로 기간이 증가함에 따라 모든 군에서 압축강도가 감소하였다(p〈0.05). 2.7일, 30일, 60일, 120일로 기간이 증가함에 따라 모든 군에서 굴곡강도가 감소하였다(p〈0.05). 3.Hybrid type인 1, 2, 3군에 비해 matrix 비율이 높은 microfine type인 5군이 강도가 낮았다. The difference of composition of composite resin may affect the mechanical properties of composite resin and the environment is important for the properties of materials. The composite resin restoration is always exposed to fluid in oral cavity and the composite resin matrix is able to absorb water, which is accompanied by some swelling of the composite. The uptake of water by composites has been correlated with decreases in surface hardness and wear resistance. The purpose of this study was to investigate the effects of water storage in 37℃ distilled water after 7days, 30days, 60days, 120days on compressive strength and flexura1 strength of dental composite resin, Z-100(group 1), Spectrum(group 2), Clearfil AP-X(group 3), Pyramid(group 4), Heliomolar(group 5). The compressive and flexural strength were measured by instron machine. The following results were obtained : 1.There were significant reduction of compressive strength as water storage time increased, 7days, 30days, 60days, 120days(p〈0.05). 2.There were significant reduction of flexural strength as water storage time increased, 7days, 30days, 60days, 120days(p〈0.05). 3.Group 1, 2, 3 -hybrid type showed higher compressive and flexural strength than group 5-microfine type which had lower filler contents.

다중시기 위성영상을 이용한 시화 방조제 내만 식생변화탐지

정종철,서영상,김상욱 한국환경과학회 2006 한국환경과학회지 Vol.15 No.4

요양병원과 병원에 입원한 노인의 의료비용의 현황과 문제점

정혜영,이지전,이상욱 關東大學校 醫科大學 醫科學硏究所 2003 關東醫大學術誌 Vol.7 No.2

In this study, the problem and current condition of healthcare cost among elderly inpatients in general hospitals and long-term care hospitals were investigated. The cost and the items of healthcare among 577 elderly inpatients that were hospitalized in 3 long-term care hospitals and 2 general hospitals was examined by detailed bills for health insurance corporation and patients. Average length of stay was 118 days. Average healthcare cost per a day was 72,312 Won.57% of the benefit cost was covered by healthcare insurance and 43% was out of the pocket money. Among the health insurance beneficiaries, coverage rate was below 50%. The amount of 52% of out of the pocket money was spent on nursing care fee provided by unskilled caregivers. Among medical care beneficiaries excluding psychiatric patients, the ratio of medical care benefit cost out of the pocket money was about 32% of medical care benefit cost, and among psychiatric patients in medical care beneficiaries, out of the pocket money reached 71% of benefit cost.

초음파 센서를 활용한 이륜차 사각지대경보시스템 연구

심정현,정희철,이상혁,김우진,이상욱 순천향대학교 산업기술연구소 2022 순천향 산업기술연구소논문집 Vol.28 No.2

The purpose of this paper is to prevent driver from accidents by effectively notifying the driver blind spot warning in a short distance such as a narrow alley when using a two-wheeled vehicle. It is easy to see that two-wheeled vehicles are more fatal in the event of an accident. We analyzed and researched a safety warning device in low-speed driving to identify critical factors for drivers in two-wheeled vehicle driving, and to identify areas that can be improved. Based on the analysis and research, an experiment was conducted and a warning system was applied to the manufactured motorcycle.

Solubility of TiO2 in NaF‑CaF2‑BaF2 Melts

Jeong‑Hyun Yoo,Sung‑Wook Cho 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6

The solubility of TiO2in NaF-CaF2-BaF2 ternary eutectic melts was investigated at the temperature range of 1025–1150 °C. The least-squares equation was obtained from the relationship between the reciprocal temperature and the natural logarithm ofthe titanium concentration in the melts saturated with TiO2. The corresponding partial molar enthalpy of dissolution of TiO2was found to be 188 kJ/mol. The titanium saturation concentration was 3.73 wt% at 1100 °C. From the titanium concentrationchange with the added amount of TiO2at different holding time after a final stirring, it was found that not only completedissolution of TiO2but also enough sedimentation of excessive TiO2should be guaranteed to obtain more reliable solubilitydata. The holding time of 10 h was found to be enough for the excessive TiO2particles to settle down in our experimentalconditions. It is noteworthy that in case of adding TiO2in excess of its solubility, the Ba1.12(Ti8O16) phase was observed atthe lower and bottom of the solidified salt ingots.

韓國産 薔薇科 植物에 관한 本草學的 硏究 I

정종길,황상욱,송호준,신민교 한국전통의학연구소 2004 한국전통의학지 Vol.14 No.1

For the purpose of developing Korean Herbalogy with the plants of Rosaceae which grow wild and is planted in Korea, the these and writings on herbalogy, from literature of successive generations, have been thoroughly investigated and the results obtained as follows: 1. There were totaled to 36 genera and 262 in Korea and among them medicinal plants are 27 genera, 117species, some 44% in total, but the number of species may be added because of the similiar plants. 2. According to sum of 262 species in Rosaceae family, they were classified into Agrimonia genera 3, Potentilla genera 26, Prunus genera 48,pyrus genera 17, Rosa genera 24, Rubus genera 28, Sorbaria genera 17, Spiraea genera 20. Thus it was noticed that Prunus genera was the main kind in total. 3. According to the oriental names which can be used for medical purpose, the medicinal plants belonging to the Rosaceae family were classified as Herba 24, Radix 43, Foilum 31, Fructus 48, Semen 11, cortex 14, Lignum, Ramulus;12 each Flos 3, pericarpium 3, resina 2, the others 6. so Fructus is 24% of all and it is the most applied in the clinical treatments. 4. According to nature and flavour of medicinal plants, they were classified into balance 84, warmth, heat; 44 each, cold, cool; 35 each bitter taste 79, sweet taste 74, sour taste 61 thus it was noticed that balance and bitter taste is the main in nature and flavour of medicinal plants 5. According to meridian tropism of herbs they were classified into liver meridian 50 lung meridian 28, stomach meridian 22, spleen meridian 20, heart meridian 19 thus it was noticed that liver meridian is the main kind 6. According to the Properties and Principal curative action, they were classified into drugs for treating detoxicant 72, drugs for treating febrifugal 55, drugs for invigorating blood circulation 53, drugs for removing dampness 46, drugs for expelling wind and drugs to stop bleeding 38 each, drugs to cure tramatic swelling and drugs for relieving pain 36 each. Thus it was noticed that drugs for treating detoxicant and febrifugal was the main kind 7. It was researched that toxic drugs include minor toxin were 10 kinds From this result, it was revealed that Fructus was the main kind in the plants for medical purpose of Rosaceae. and toxic plants was slightly poisonous that it will be used for clinical treatments more easily. It is considered that many experiments and clinical approaches must be continued to use Rosaceae plants widely.

시퀀스 데이터베이스를 위한 서브시퀀스 탐색의 효율적인 처리

박상현,김상욱,박정일 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.A

This paper deals with the subsequence searching problem under time-warping. Our work is motivated by the observation that subsequence searches slow down quadratically as the average length of data sequences increases. To resolve this problem, the Segment-Based Approach for Subsequence Searches (SBASS) is proposed. The SBASS divides data and query sequences into a series of segments, and retrieves all data subsequences. Our segmentation scheme allows segments to have different lengths; thus we employ the time warping distance as a similarity measure for each segment pair. For efficient retrieval of similar subsequences, we extract feature vectors from all data segments exploiting their monotonically changing properties, and build a spatial index using feature vectors. The effectiveness of our approach is verified through extensive experiments.

광섬유 집합체 센서를 이용한 6MV 광자선의 반음영 및 심부선량백분율 측정

신상훈,장경원,조동현,유욱재,서정기,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-

In this study, a fiber-optic bundle sensor has been developed using water-equivalent organic scintillating fibers for photon beam measurement. Beam penumbra and percent depth doses(PDD) are measured according to the depth of the photon beam. This sensor has many advantages such as high resolution, real-time measurement and ease of calibration over conventional radiation measurement devices.

광대역 CDMA 시스템을 위한 Transmit Adaptive Array와 전송 안테나 선택 다이버시티 결합 기법

강상욱,윤정오 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(A)

Transmit diversity schemes are an effective capacity improvement method for down link of Wideband Code Division Multiple Access (W- CDMA) systems. In this paper, we propose to use transmit antenna subset selection scheme in conjunction with closed loop Transmit Adaptive Array (TxAA). The proposed scheme selects N_s optimum antennas among N_T transmit antennas in order to maximize diversity gain from selected antennas, and also reduces the cost of RF chains by employing two different types of RF modules for the selected and the unselected antenna group. Under the same limitation on the amount of feedback information and feedback bandwidth as of the 3GPP specifications, the proposed scheme always outperforms the conventional closed loop TxAA with N_S antennas for all the mobile speeds. Moreover, the proposed scheme also shows better results than the TxAA with all the N_T antennas in realistic situations considering feedback delay, feedback bandwidth limitation and quantization.