유한대판법에 의한 박판의 좌굴해석

나웅,이명수,이성철 동국대학교 산업기술연구원 1995 산업기술논문집 Vol.6 No.-

일반적으로 널리 쓰이고 있는 유한요소법은 강성매트릭스의 크기가 전체 구조체의 절점수의 총합에 절점자유도를 곱한 수와 같게 되어 상당히 큰기억용량을 필요로 하는데 비해, 유한대판법은 평판을 띠판으로 나누어 각 띠판의 절감수에 자유도를 곱한 것에 불과해 유한요소법에 비하여 훨씬 적은 기억용량만으로도 해석이 가능하다. 즉, 유한대판법이 유한요소법과 비교하여 유리한 점은 적은 요소와 자유도로도 비교적 엄밀하여 빨리 수렴한다는 점이다. 따라서 본 논문에서는 휨과 압축을 받는 경우에 있어서 여러 가지 조건에 따른 평판의 좌굴해석을 하여 유한대판법의 적용성을 검토하였다. For years, the finite element method has been known to be effective and versatile in various areas of continuum mechanics problems. In 1968, Y.K. Cheung developed a new method so-called "Finite Strip Method". This finite strip method has advantage over the finite element method in computing costs and has been effectively used in the static analysis of plate/shell structures with flat and rectangular geometric planes and simple loading and boundary conditions. In this study, the finite strip method is applied to the buckling analysis of rectangular plates subjected to combined actions of in-plane compression and in-plane bending. The result of the present study are compared to analytical solutions. The comparisons indicate that the finite strip method can be also effectively used for the buckling analysis of plate structures with simple geometries boundary conditions.

여성 복압성요실금에서 SPARC 술식의 효과: 1년 이상의 추적 결과

나웅,이종복 대한비뇨의학회 2006 Investigative and Clinical Urology Vol.47 No.7

음경 및 고환의 만성 림프부종의 수술적 치료

나웅,박정원,임종렬,이종복,정한 대한비뇨의학회 2005 Investigative and Clinical Urology Vol.46 No.3

Chronic lymphedema of the penis and scrotum is a rare disease in Korea. Lymphedema can be defined as an accumulation of excessive lymph, proteins, chronic inflammation, edema and fibrosis, secondary to the impairment of the lymph vessels, which can be classified into primary, which is the result of inadequate drainage of lymph caused by agenesis and hypogenesis of lymph vessels, and secondary, which could be due to an obstruction or interruption of the lymphatic system, caused by malignancies, post-operative, post-radiation fibrosis, infection, trauma or excision. The treatment method for a lymphedema of the genitalia is determined by cause, which is crucial to the natural course of the disease. In contrast to a primary lymphedema without soft tissue changes and injury, which could be treated conservatively, surgical excision is the best method to treat a chronic lymphedema with soft tissue changes. In this article, a case of penile and scrotal chronic lymphedema of unknown cause, treated with surgical methods, is reported

[목포시 주민자치위원 제2회 한마음전진대회 및 회장 이 · 취임식] 문준포 신임회장 "목포 발전에 모든 힘 쏟을 것"_주민자치역량 강화와 주민자치위원들 간 결속을 다지다

나웅 한국자치학회 2017 월간 주민자치 Vol.69 No.-

靈樞衛氣失常에 對한 硏究

羅雄仁,李東鎬 대한한의학원전학회 1999 대한한의학원전학회지 Vol.12 No.1

Are There Risk Factors for Persistent Urge Urinary Incontinence after the Transobturator Tape (TOT) Procedure in Mixed Urinary Incontinence?

김태완,나웅,이종복 대한비뇨의학회 2011 Investigative and Clinical Urology Vol.52 No.6

Purpose: We wanted to identify factors predicting persistent urge urinary incontinence (UUI) after the transobturator tape (TOT) procedure in patients with mixed urinary incontinence (MUI). Materials and Methods: Of 293 patients who underwent a TOT procedure from May 2007 to August 2010, 175 MUI patients had at least one 6-month follow-up visit. Preoperative evaluations including history taking, physical examination, urinalysis, urine culture, uroflowmetry, postvoid residual (PVR), urodynamic studies (UDS), and symptom questionnaire were performed. After the operation, surgical outcome and patient satisfaction were assessed by symptom questionnaire, uroflowmetry, PVR, and stress test. Statistical analysis was carried out to determine the possible factors influencing persistent UUI after the TOT procedure. Results: Of 175 patients with MUI, 51 (29.1%) had persistent UUI after the TOT procedure. In a univariate analysis, age (p=0.012) and previous anticholinergic use (p=0.040) were found to be associated with persistent UUI. However, only age (adjusted odds ratio, 3.317; 95% confidence interval, 1.015-12.060; p=0.036) was an independent risk factor in the multivariate analysis. Conclusions: Our findings suggested that women who are older than 65 years may have an increased likelihood of persistent UUI after a TOT procedure. Clinicians should consider the possibility of persistent postoperative UUI in elderly women with mixed incontinence.

Interval from Prostate Biopsy to Robot-Assisted Laparoscopic Radical Prostatectomy (RALP): Effects on Surgical Difficulties

김인성,나웅,남정수,오종진,정창욱,홍성규,변석수,이상은 대한비뇨의학회 2011 Investigative and Clinical Urology Vol.52 No.10

Purpose: Traditionally, an interval of 4 to 6 weeks has been recommended after prostate biopsy before open radical prostatectomy. However, such an interval is not explicitly specified in robot-assisted laparoscopic radical prostatectomy (RALP). This study was designed to determine whether the interval from prostate biopsy to RALP affects surgical difficulties. Materials and Methods: Between January 2008 and May 2009, a total of 237 men underwent RALP in our institution. The interval from biopsy to RALP was categorized as follows: ≤ 2 weeks, >2 to ≤ 4 weeks, >4 to ≤ 6 weeks, >6 to ≤ 8 weeks, and >8 weeks. Multivariate analysis was used to identify whether the interval from prostate biopsy to RALP was an independent predictor of operative time, estimated blood loss (EBL), margin positivity, continence, and potency. Results: Among the 5 groups, there were no significant differences in age, body mass index (BMI), preoperative serum prostate-specific antigen (PSA), prostate volume, or preoperative International Index of Erectile Dysfunction-5 score (all p>0.05). In the multivariate analysis, operative time was significantly associated with prostate volume. EBL was associated with prostate volume and BMI. Margin positivity was associated with preoperative serum PSA, prostate volume, and biopsy Gleason score. Postoperative continence and potency were significantly associated with age. However, in univariate and multivariate analyses, the interval from biopsy to RALP was not significantly associated with operative time, EBL, margin positivity, postoperative continence, or potency (all p>0.05). Conclusions: Our data suggest that the interval from prostate biopsy to RALP is not related to surgical difficulties.

Epidemiologic study of bladder and urethral injury in Korea: A nationwide population-based study

태범식,윤영은,나웅,오경진,박성열,박재영,문홍상 대한비뇨의학회 2022 Investigative and Clinical Urology Vol.63 No.1

Purpose: We aimed to analyze the characteristics and management of bladder and urethral injuries in Korea by use of the National Health Insurance Service (NHIS) database. Materials and Methods: Data from the NHIS database representative of all cases of Korean bladder injury (n=4,631) and urethral injury (n=17,858) reported between 2012 and 2016 were analyzed. We used the International Classification of Diseases, 10th revision, clinical modification codes to identify the diagnoses. Results: A total of 491 males (1.97/100,000) and 590 females (2.39/100,000) experienced bladder injury in 2012, and 449 males (1.76/100,000) and 624 females (2.47/100,000) in 2016. The risk of bladder injury was higher in female than in male (hazard ratio [HR], 1.267; p<0.001). The annual incidence of bladder injury did not increase (HR, 0.992; p=0.409). A total of 2,886 (62.3%) patients were managed with conservative treatment, and 1,745 (37.7%) patients underwent surgical treatment. A total of 4,114 males (16.5/100,000) and 285 females (1.2/100,000) had urethral injury in 2012, while 4,465 males (17.5/100,000) and 303 females (1.2/100,000) had urethral injury in 2016. The incidence of urethral injury is increasing annually (HR, 1.010; p=0.036). Conclusions: The incidence of urethral injury increased continuously over the years studied, whereas that of bladder injury remained unchanged in Korea. The incidence of bladder injury was higher in females, and more than 90% of total urethral injuries were reported in males. This is the first study to evaluate the epidemiology of bladder and urethral injury using a nationwide population database.

An Unusual Meningothelial Element in a Hairy Polyp of the Hard Palate

장시형,민경환,나웅,장세민,백승삼 대한병리학회 2008 Journal of Pathology and Translational Medicine Vol.42 No.5

Hairy polyps are a rare malformations of bigerminal origin that comprise of both ectodermal and mesodermal elements. Meningothelial elements are an extremely rare pathologic finding in hairy polyps. Here we report a case of a hairy polyp with a meningothelial element, which originated from the hard palate. A 1-year-old boy was evaluated for an intraoral mass accompanied by multiple congenital anomalies. A small polypoid mass was noted at the midline of the hard palate. The lesion had central fibroconnective tissue with an unusual stromal component showing reticulated anastomosing pseudovascular patterns. Immunohistochemical staining of the cells lining the pseudovascular spaces and the interstitial cells revealed vimentin and epithelial membrane antigen positivity. Hairy polyps are a rare malformations of bigerminal origin that comprise of both ectodermal and mesodermal elements. Meningothelial elements are an extremely rare pathologic finding in hairy polyps. Here we report a case of a hairy polyp with a meningothelial element, which originated from the hard palate. A 1-year-old boy was evaluated for an intraoral mass accompanied by multiple congenital anomalies. A small polypoid mass was noted at the midline of the hard palate. The lesion had central fibroconnective tissue with an unusual stromal component showing reticulated anastomosing pseudovascular patterns. Immunohistochemical staining of the cells lining the pseudovascular spaces and the interstitial cells revealed vimentin and epithelial membrane antigen positivity.

Myxoma of the Larynx Presenting As a Nodule

송영수,장시형,민경환,나웅,장세민,전영진,백승삼 대한병리학회 2008 Journal of Pathology and Translational Medicine Vol.42 No.5

We describe herein a rare case of a laryngeal myxoma presenting as a nodule. Laryngeal myxomas involving the neck region, especially the laryngeal area, are quite rare. A 36-yearold male patient presented with a 2 month history of hoarseness. On laryngoscopic examination, there was a myxoid homogeneous transparent mass on the right vocal cord. On microscopic examination, the lesion was hypocellular and myxoid. The lesion showed stellate or spindle cells which were evenly dispersed in the poorly vascularized myxoid stroma. Although the incidence is extremely rare, a laryngeal myxoma should be considered in the differential diagnosis of laryngeal masses.