경부식도의 재건

서장수,서동보,이경호,김정철,차규호 영남대학교 의과대학 1992 Yeungnam University Journal of Medicine Vol.9 No.1

저자들은 1991년 10월부터 1992년 2월까지 본원 이비인후과를 통해 내원하였던 3명의 환자를 대상으로 경부식도 재건 목적으로 유리 전완피판술 2폐, 전흉부 축형피판술 1례를 시행하였으며 다음과 같은 결과를 얻어 이에 문헌고찰과 함께 보고하는 바이다. 1. 유리 전완피판술을 이용하여 피판의 한쪽변을 deepithelization한 수 이중봉합 하였으며, 원위부는 완만한 S자 모양으로 도안하고 하부식도에 틈을 만들어 피판을 삽입함으로서 문제점으로 제기되어온 하부식도문합부 협착, 누공형성등의 합병증을 해결할 수 있었다. 2. 술전 방사선 치료로 수혜부의 혈관을 이용하지 못할때에는 전흉부 축형피판술을 사용하여 만족할 만한 결과를 얻을 수 있었다. 3. 공장 전이술의 합병증인 개복의 번거러움과 수술후 장폐색증, 운동장애, 연하곤란, 음식물의 역류등의 문제점을 해결할 수 있었다. Microvascular tissue transfers have facilitated primary closure of various complex defects after radical ablation of head and neck cancers. From Oct 1991 to Feb 1992, we used forearm free flap in two patients and delto-pectoral flap in one patient who had preoperative irradiation for pharyngoesophageal reconstruction. The stricture and fistular formation were most troublesome complication in forearm free flap, so we designed as lazy S shape in distal flap margin to prevent circular contraction and longitudinal margin was deepithelized (5㎜) and sutured double layer to withstand fistular formation and this can be considered useful in place of a free jejunal transfer.

수무지 다지증의 교정

차규호,최시호,설정현,김기열 대한성형외과학회 1992 Archives of Plastic Surgery Vol.19 No.3

There has been steady decrease in the number of traumatic injuries and inflammatory diseases of the hand, hence, the relative percentage of congenital malformation of the hand is becoming greater. The most common congenital anomaly of the hand is polydactyly and the principal goal of correction is the accurate establishment of the longitudinal skeletal axis. We have experienced 11 cases of duplicted thumbs and type IV by Wassel's classification was the most common type. For surgical correction, we used bone -ligament flap for joint rein forcement. Unnecessary metacarpal head was trimmed on both sides for centralization. We obtained a favorable results.

수무지 첨부손상의 즉시 재건

차규호,우상현,이대훈,설정현 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.3

In the department of plastic surgery, Yeung Nam university hospital, 38 cases of thumb tip injury were immediately reconstructed during last 4 years. We analysed and followed up the patient and obtained following results: 1. Thumb tip injury was most commonly involving in third decade with 18 cases (45%) and occurred predominantly in male with 34 cases (90%). 2. The injuries were mainly caused by press machine with 19 cases (50%). 3. Crushing was predominant nature of the injuries with 19 cases (50%). 4. The thumb tips were most commonly involved at the level of nail matrix with 16 cases (42%). 5. In 28 cases (73%), only thumb tip was injured without other combined injury. 6. Rt. side (23 cases, 60%) was more commonly involved than Lt. 7. Cross-side finger flap revealed the best result for the treatment of distal amputation of nail matrix. Contrarily in proximal amputation, microreplantation had the best result in both the cosmetic and the functional standpoint.

Wideband Directive Self-Complementary Bowtie Antenna for Ka-band

박홍수,차규호,홍순기 한국전자파학회 2022 Journal of Electromagnetic Engineering and Science Vol.22 No.3

This paper presents a novel wideband directive self-complementary bowtie antenna (SCBA) designed for Ka-band. The proposed antenna is well suited for wireless power transfer and energy harvesting of compact devices using 5G frequencies. The proposed SCBA consists of self-complementary triangular elements and a ground plane, which are added to enhance directivity. The optimized design exhibits a wide impedance bandwidth that covers the entire Ka-band, despite the presence of a ground plane. The proposed SCBA was validated via simulation and measurement. The results demonstrate a bandwidth of 43.8% (25.8–40.1 GHz) and a maximum gain of 10.4 dBi at 29.5 GHz with a compact antenna size of 9.2 mm × 8.7 mm.

Measurement of Nonlinear RCS of Electronic Targets for Nonlinear Detection

오수영,차규호,홍하영,박홍수,홍순기 한국전자파학회 2022 Journal of Electromagnetic Engineering and Science Vol.22 No.4

The conventional radar technology is based on linear detection—i.e., the same transmit and receive frequencies are used. However, with linear radars, difficulties arise when detecting electronic objects with relatively small radar cross section (RCS). To overcome these limitations, a nonlinear radar that can detect nonlinear responses (i.e., harmonic and intermodulation) scattered by electronic devices due to nonlinear interaction can be utilized. Nonlinear radars require a different analysis from linear radars for analyzing RCS. In this paper, we present an experimental analysis of the nonlinear RCS of various electronic devices. Unlike linear radars, RCS in nonlinear radars is determined by the amount of nonlinear responses backscattered to the radar. Therefore, we derive a radar equation accustomed to harmonic radars that consists of nonlinear RCS. We then obtain and analyze the nonlinear RCS of various targets from the measured harmonic responses of the targets based on the nonlinear radar equation.

Usefulness of Intravenous Anesthesia Using a Target-controlled Infusion System with Local Anesthesia in Submuscular Breast Augmentation Surgery

정규진,차규호,이준호,김용하,김태곤,김일국 대한성형외과학회 2012 Archives of Plastic Surgery Vol.39 No.5

Background Patients have anxiety and fear of complications due to general anesthesia. Through new instruments and local anesthetic drugs, a variety of anesthetic methods have been introduced. These methods keep hospital costs down and save time for patients. In particular, the target-controlled infusion (TCI) system maintains a relatively accurate level of plasma concentration, so the depth of anesthesia can be adjusted more easily. We conducted this study to examine whether intravenous anesthesia using the TCI system with propofol and remifentanil would be an effective method of anesthesia in breast augmentation. Methods This study recruited 100 patients who underwent breast augmentation surgery from February to August 2011. Intravenous anesthesia was performed with 10 mg/mL propofol and 50 μg/mL remifentanil simultaneously administered using two separate modules of a continuous computer-assisted TCI system. The average target concentration was set at 2 μg/mL and 2 ng/mL for propofol and remifentanil, respectively, and titrated against clinical effect and vital signs. Oxygen saturation, electrocardiography, and respiratory status were continuously measured during surgery. Blood pressure was measured at 5-minute intervals. Information collected includes total duration of surgery, dose of drugs administered during surgery, memory about surgery, and side effects. Results Intraoperatively, there was transient hypotension in two cases and hypoxia in three cases. However, there were no serious complications due to anesthesia such as respiratory difficulty, deep vein thrombosis, or malignant hypertension, for which an endotracheal intubation or reversal agent would have been needed. All the patients were discharged on the day of surgery and able to ambulate normally. Conclusions Our results indicate that anesthetic methods, where the TCI of propofol and remifentanil is used, might replace general anesthesia with endotracheal intubation in breast augmentation surgery.

선천성 피부결손증의 치험 1례

김용하,차규호,정재호,이경호,설정현 영남대학교 의과대학 1992 Yeungnam University Journal of Medicine Vol.9 No.2

저자들은 희귀하고도 사망율이 높은 선천성 피부결손증 1례를 경험하고 국소피판과 피부이식으로써 치료하고 비교적 만족한 결과를 얻었기에 문헌고찰과 함께 보고하는 바이다. One case of Congenital Cutis Aplasia is presented. The defect involved includes full-thickness skin defect of scalp and cranium. The patient was treated with debridement of dirty necrosed crust which covered exposed dura mater and with double opposing rotation flap including pericranium for bone regneration. The donor site was covered with skin graft from right thigh. During operation, the superficial temporal arterty was found to be short and weak. And after operation, the margin of flap were congested and finally necrotized. The necrotic wound was treated with conservative management. The vascular impairment is thought to be main course of Congenital Cutis Aplasia. So we conclude that the treatment of choice is conservative management or careful flap surgery for coverage of defect area.

조직확장술의 합병증에 대한 임상적 고찰

김용하,이경호,차규호,설정현,정재호 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.6

Tissue expanders have been widely used in plastic and reconstructive surgery to construct local flaps composed of tissue adjacednt to a tissue defect or deformity. We reviewed the records of the patients who recieved tissue expansion for recent 6 years and retrospectively analysed the complications of tissue expansion to refine the tissue expansion technique and to decrease the complication rate. 1. Fourty eight patients among fifty nine patients(81.4%) have satisfactory result. 2. We have good results in scalp, face and neck but poor results in lower extremities. 3. We experienced major complications in 24 expanders(27.6%) and minor complications in 25 expanders(28.7%). 4. Two separate incision method was effective for the prevention of disruption of incision site by preserving skin bridge at maximal tension point. 5. The remote type expander had lesser chance of deflation than integral type. 6. To decrease leakage through the port, oblique injection method may be useful. 7. Resection of redundant flap and capsulotomy are not desirable because they can cause flap necrosis.

케미칼 크랙킹 방법을 이용한 플라스틱 제품의 응력측정에 관한 연구

원시태 ( S. T. Won ),김태범 ( T. B. Kim ),이실 ( S. Lee ),원정민 ( J. M. Won ),차규호 ( K. H. Cha ),류민영 ( M. Y. Lyu ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.4

사출성형품에서 잔류응력은 성형공정 중 열과 전단응력에 의해 형성된다. 잔류응력을 평가하는 방법은 여러 가지가 있는데, 불투명한 제품에서의 잔류응력은 케미칼 크랙킹 테스트 방법으로 측정 할 수 있다. 이 방법은 시편과 솔벤트가 반응하게 하여 측정하는 방법이다. 크랙은 응력의 크기에 따라 형성되기 때문에 크랙의 크기나 수를 측정하여 응력을 정량적으로 측정한다. 본 연구에서는 케미칼 크랙킹 방법으로 잔류응력을 측정하기 위한 기초자료인 응력과 크랙과의 관계를 규명하기 위한 실험을 수행하였다. 시편을 제작하기 위한 재료는 PC/PBT와 PC/ABS사용하였으며 지그를 이용하여 시편을 변형을 주고 이를 솔벤트에 담궈서 크랙을 유도하였다. 솔벤트는 tetrahydrofuran과 methyl alchol을 이용하여 제조하였다. 두 재료 모두 응력이 어느 정도 이상에서만 크랙이 형성되었으며, 크랙은 응력이 증가함에 따라 대략 2차함수로 증가하였다. Residual stress in the injection molded part is originated from thermal shrinkage and shear stress during injection molding process. There are many measurement methods of residual stress in the plastic part. Residual stress in opaque products can be measured by chemical cracking test. This method enables the solvent and specimen to react and to cause cracks. Cracks developed according to the level of residual stress. Thus the stresses in plastic part can be quantitatively measured by counting the number of cracks or measuring the size of cracks. Relationship between stress and number of cracks in a plastic specimen has been investigated in this study. Bergen jig was used to give a strain in the specimens those were molded using PC/PBT and PC/ABS. Solvent for the chemical cracking test was prepared using tetrahydrofuran and methyl alcol with the ratio of 1 to 3. Stresses in the specimen can be calculated by strains those were imposed by Bergen jig. Cracks were developed for stress higher than certain level. The number of cracks increased by second order function for stress.