안면신경 마비 환자에 있어서의 측두근 및 근막피판을 이용한 안면근 기능 회복 증례보고

정창주,권혁도,엄인웅,우승철,민승기,정호용 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.1

Generally, the totally paralyzed face can never be made normal by any of the current methods of reconstruction. Careful selection of patients based on sound judgment of what can and cannot be achieved by the proposed surgical technique is paramount to a successful operation and a satisfied patient. The results are related to time of delayed between injury and repair : the shorter the delay the better are the results. The objectives in correcting facial paralysis are to achieve normal appearance at rest ; symmetry with voluntary motion ; control of the ocular, oral, and nasal sphincter; symmetry with involuntary emotion and controlled balance when expressing when expressing emotion ; and no significant functional deficit secondary to the reconstructive surgery. It must be employed a number of concepts, for treatment of the paralyzed face by surgeon, depending on the cause, time interval, and wound characteristics, as well as the availability of and necessity for neuromuscular substitution. Nerve grafts, crossovers, muscle transfers, free muscle and nerve-muscle grafts, micronuerovascular muscle transfers, and regional muscle transpostion are the principal methods being developed. We applied the tmporal musle transposition for reanimation of unilatrally paralyzed faces for long times on two patients. The results of muscle transposition can be enhanced by the patient's learning to activate the transposed muscle by voluntary effort, and are best in patients who are motivated to learn the necessary motor-sensory coordination techniques.

전립선암과 전립선비대증 환자에서 혈청 유리 및 총전립선특이항원 측정의 의의

서혁준,박형민,권태균,정성광,김법완,이재태 경북대학교 의학연구소 2000 경북대학교병원의학연구소논문집 Vol.4 No.1

Purpose: This study was peformed to investigate whether the free to total PSA ratio(F/T PSA ratio) offers a better discriminant for the detection of patient with prostatic cancer(CaP) and those with benign prostatic hyperplasia(BPH) than serum total PSA alone. Materials and Methods: From September 1996 to February 1999, free and total PSA levels were measured on frozen sera samples of 154 men with BPH and 46 with CaP using immunoradiometric assay. Results: In all subjects, the mean total PSA was significantly higher in CaP group(72.57±66.58ng/ml) than BPH group(3.12±4.10ng/ml). The mean PSAD was significantly higher in CaP group(1.64± 1.86) than BPH group(0.08±0.01). The mean F/T PSA ratio was significantly lower in CaP group(0.19± 0.07) than BPH group(0.30±0.13). Among 41 subjects whose total PSA were between 4-20ng/ml, the mean PSAD was significantly higher in CaP group(0.37±7.16) than BPH group(0.17± 0.07), but the mean F/T PSA ratio was not significantly different between CaP(0.19± 0.10) and BPH group(0.25±7.13). By comparing the sensitivity and specificity of total PSA alone, PSAD and F/T PSA ratio on receiver operating characterislic (ROC) Cutie in all subiects and subiects with total PSA between 4-20ng/ml, F/T PSA ratio had no superiority than total PSA alone and PSAD for discrimination between CaP and BPH. Conclusions: We suggest that the F/T PSA ratio is not superior to total PSA alone and FSAD in the detection of prostatic cancer, and further evaluation of the usefulness of F/T PSA ratio should be required.

유전체 해석용 유한요소법을 위한 프로그램의 개발

김충혁 광운대학교 신기술연구소 1996 신기술연구소논문집 Vol.25 No.-

본 연구에서는 고성능 PC를 사용하면서도 메모리를 다루는데 편리한 경제적인 프로그래밍 환경을 구축하여 이에 따른 Program-Routine을 개발하였다. 연구에서 얻어진 결과는 경제적인 Ma-chine의 도입이 가능하고 메모리 처리가 어렵지 않은 만족할 만한 처리속도를 얻을 수 있었다. In this study, a program routine using high performance PC which follows to economic programing environment and easy memory access mode is developed. The result from this study shows the possibility of economic machine utility and memory independent program-ming.

다발성 골수종에서 저용량 thalidomide, cyclophosphamide, dexamethasone (TCD) 요법의 효과

류충헌,정재현,고정해,장제혁,박영진,최규남,박봉수,이상민,주영돈 인제대학교 2008 仁濟醫學 Vol.29 No.-

Background and Objectives : The immunomodulatory drug thalidomide can inhibit angiogenesis and induce apoptosis in experimental models. It can also induce marked and durable response in newly diagnosed myeloma patients. Thalidomide has been used at doses ranging from 200 to 800 mg with significant toxicity. No data are available on the impact of low-dose thalidomide, cyclophosphamide and dexamethasone as initial therapy for myeloma patients. Design and Methods : To address this issue, newly diagnosed myeloma patients were treated with 50 mg/day thalidomide continuously and cyclophosphamide 150 mg/m², days 1-4 and dexamethasone 20 mg/m², days 1-5 and day 15-19, every month. Between October 2005 and October 2006, 14 patients (median age 54.5 years) were treated with low-dose thalidomide, cyclophosphamide and dexamethasone. Results : After a minimum of two cycles of treatment, 5 patients (55.5%) showed a partial remission. After four cycles of treatment, 10 patients (83.3%) showed a partial remission (n=6) and complete remission (n=4). After a median follow-up of 15.4 months, 1 year overall survival rate was 82.0%. Thalidomide was well tolerated without serious toxic effects. Conclusions : The combination of low-dose thalidomide, cyclophosphamide and dexamethasone demonstrates favorable response rate and 1 year overall survival rate in newly diagnosed myeloma. Severe toxicities were not seen with this combination.

RF Sputtering법에 의한 SrBi2Ta209 박막의 강유전 특성

최운식,김충혁 대불대학교 2000 論文集 Vol.6 No.1

Annealing dependencies of ferroele Annealing dependencies of ferroelectric properties of SrBi2Ta209 thin films were observed as function of substrate temperature (400∼500℃) by the rfmagnetron sputtering method. With increasing annealing temperature from 600℃ to 850℃, flourite phase was crystallized to 650℃ and Bi-layered perovskite phase was crystallized above 700℃. The fatigue characteristics of SBT thin films deposited on Pt/TiO2/SiO2/Si substrate did not change up to 1010 switching cycles. The maximum remanent polarization is 11.73μC/㎠ at 500[℃] of substrate temperature and at 750[℃] annealing temperature for 30min.

Study on the Dielectric Properties of (Sr.Ca)TiO_(3) BL Capacitors

최운식,김충혁 대불대학교 1999 論文集 Vol.5 No.1

Microstrutures and dieletric properties of (Sr_(1-x)Ca_(x)) TiO_(3)-0.006Nb_(2)O_(5)(0.05≤x≤0.2) boundary layer ceramic were investigated. The SEM photo. and EDAX revealed that CuO was penetrated rapidly into the bulk along the grain boundaries during the annealing. The average grain sizes is continuously increased as the content of substitutional Ca is increased form 5[mol%] to 15[mon%], but the average grain size of the specimen with content of 20[mol%] Ca is slightly decreased. In the specimens with content of 10∼15[mol%] Ca, excellent dielectric propeties were obtained as follows; dielectric constant <25000,dielectric loss <0.3[%], and capacitance change rate as a function of temperature <?10[%], respectively. All specimens in this study exhibited dielectric relaxation with frequency as a function of the temperature.

장방형 개구부를 갖는 고강도 철근콘크리트 깊은 보의 전단거동

은희창(Eun Hee-Chang),양근혁(Yang Keun-Hyeok),정헌수(Chung Heon-Soo) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.8

This study is an experimental study to investigate the shear behavior of reinforced high-strength concrete deep beams with rectangular openings and presents an equation to determine the shear strength of those beams. Experimental parameters include shear span-to-overall depth ratio(a/h) as well as the width and depth of web opening. Test results indicate that the maximum crack width depended on shear span-to-overall depth ratio rather than size of web opening and the depth of opening had more influence on the shear strength of the beams than the width of opening. Based on Yang & Chung's equation which proposed to predict the shear strength of deep beams, an equation was established by the experimental results, fundamental theory of fracture mechanics, and multiple regression method. Through the comparison of experimental data and analytical results obtained from this and other studies, it was observed that the proposed equation properly estimates the ultimate shear strength of deep beams with rectangular openings.

REAPPRAISAL OF SOFT TISSUE PREDICTION IN ORTHOGNATHIC SURGERY FOR MANDIBULAR PROGNATHISM

Chung, Noo-Hyeok,Nam, Il-woo 大韓顎顔面成形再建外科學會 1991 Maxillofacial Plastic Reconstructive Surgery Vol.13 No.1

두부방사선사진을 이용한 안모의 측모예측은 악교정수술에 있어서 가장 중요한 수술전 치료계획의 한부분으로 술후 경조직과 연조직의 변화를 예상하며 술자와 환자간에 술후 결과를 의논하는 대화의 재료로서도 그 중요성이 크다. 그러나, 술후 환자의 최종적인 측모와 수술 직전에 수술 계획에 따라 시행한 술후 측모의 예측과는 차이가 있다. 이러한 수술 전 시행하는 측모 예측의 부정확성을 감소시키기 위하여 새로운 경조직 대 연조직 변화비율 등을 추정하는 많은 연구가 시행되어 왔으나 측모방사선 예측의 부정확도를 조사하고 이러한 부정확성에 영향을 미치는 변수를 확인함이 측모방사선예측의 부정확성을 이해하고 감소시키는 데에 있어서 그 중요성이 크다고 생각된다. 이에 저자들은, 이미 시행되어 수술에 사용된 술후 측모예측기록을 수술직후 두부방사선 사진 및 술후 최소 6개월 추적 방사선 사진에 중첩하여 측모 예측의 부정확도를 조사한 바 총 30명의 환자에서 20명(66.6%)이 부정확도를 보였고 악골 및 치열의 술후 위치 불안정성도 측모 예측 정확군과 부정확군에 모두 19명(63.3%)에서 발생하여 측모 예측의 부정확도 영향을 주는 중요한 요인으로 확인되었다. Cephalometric prediction tracing is the preoperative double checking procedure which can predict bony and soft tissue change. Soft tissue profile prediction is routinely performed according to the known ratios of the soft to hard tissue movement which can vary considerably in each individual. Besides interindividual variation of the ratios of the soft to hard tissue change, actual results of the postoperative soft tissue profile can reflect other important modifying factors if it is compared with prediction tracing used. The purpose of this study is to compare soft tissue prediction tracing used with postoperative tracting and to find intervening modifying factor via serial tracing. Review of 30 prediction tracing showed that the most important factor contributing to prodiction tracing inaccuracy was the skeletal and dental relapse. And, some factors which may be responsible for prediction tracing inaccuracy were discussed.

Temperature-dependent electrical properties of organic light-emitting diodes depending on cathodes

Chung, Dong Hoe,Hur, Sung Woo,Kim, Sang Keol,Lee, Joon Ung,Kim, Chung Hyeok,Hong, Jin Woong,Kim, Tae Wan Elsevier 2004 CURRENT APPLIED PHYSICS Vol.4 No.6

<P><B>Abstract</B></P><P>We have studied temperature-dependent electrical properties of organic light-emitting diodes with a variation of cathode materials; Al, LiAl, and LiF/Al. The organic light-emitting diodes emit a light by a recombination of injected charge carriers such as holes and electrons. Thus, the charge transport is affected by the injection barrier at the interface. By varying the cathode materials, the electron injection at the interface could be controlled because of the work-function change at the cathode. Temperature-dependent current–voltage luminance characteristics of the organic light-emitting diodes were measured in the temperature range from 10 to 300 K. The current-voltage characteristics were analyzed in terms of Fowler–Nordheim tunneling model, and the energy-barrier height was obtained. A measured lifetime of device with LiF/Al cathode is relatively longer than the other cathodes at room temperature: 4.5 h for Al cathode, 12.4 h for LiAl, and 29.6 h for LiF/Al. The device with LiAl and LiF/Al cathode, in the aspect of lifetime and luminous efficiency, is superior to one of other cathodes.</P>

Leakage flux, Leaked voltage, Leaked current, Magnetic flux density, Surface leakage

Chung Hyeok Kim,Tag-Yong Kim,Yong-Cheul Oh 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.3

Current research about voltage leakage involves investigation of the effects of leaked voltage and current on humans through simulated environments and dummies. Electrocution results from leaked current when electricity flows through the body as a result of potential difference. Research that analyzes actual electrocution is insufficient because of the danger from leaked voltage present in the leakage area. This thesis analyzes magnetic flux density from current around a leak to investigate the distribution of current. The authors used a simulated environment to investigate electrocution accidents that frequently occur during floods through leakage along metal surfaces, and evaluated the distribution of leaked magnetic flux. Current research about voltage leakage involves investigation of the effects of leaked voltage and current on humans through simulated environments and dummies. Electrocution results from leaked current when electricity flows through the body as a result of potential difference. Research that analyzes actual electrocution is insufficient because of the danger from leaked voltage present in the leakage area. This thesis analyzes magnetic flux density from current around a leak to investigate the distribution of current. The authors used a simulated environment to investigate electrocution accidents that frequently occur during floods through leakage along metal surfaces, and evaluated the distribution of leaked magnetic flux.