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임동훈,성신희,Im, Dong-Hun,Seong, Sin-Hui 한국정보처리학회 2000 정보처리논문지 Vol.7 No.3
In this paper we describe a nonparametric Wilcoxon test and a parametric Z test based on statistical hypothesis testing for the detection of edges. We use the threshold determined by specifying significance level $\alpha$, while Bovik, Huang and Munson[4] consider the range of possible values of test statistics for the threshold. From the experimental results of edge detection, the Z method performs sensitively to the noisy image, while the Wilcoxon method is robust over both noisy nd noise-free images. Comparison with our statistical tests and Sobel operator shows that our tests perform more effectively in both noisy and noise-free images.
한국인 전립선암 환자에서 술 전 중등도위험군에서 술 후 고위험군으로 이행할 수 있는 인자
유제국(Je Guk Ryu),황인상(Insang Hwang),임동훈(Dong Hun Im),정영범(Young Beom Jeong),박승철(Seung Chol Park),노준화(Joonwha Noh),권동득(Dong Deuk Kwon),강택원(Taek Won Kang) 대한비뇨기종양학회 2013 대한비뇨기종양학회지 Vol.11 No.3
Purpose: We aimed to examine a change and relevant predictors in intermediate-risk prostate cancer which have a wide range of treatment options from active surveillance to radical prostatectomy (RP). Materials and Methods: Of 1,159 patients who underwent RP in multi-institution between January 2009 and December 2012, 390 patients who were classified as intermediate-risk prostate cancer group by preoperative evaluation according to NCCN guideline were enrolled in this retrospective study. The rates of Gleason score upgrading, upstaging and migrating to high-risk prostate cancer group at final pathology and there risk factors were assessed. Results: The mean age of enrolled patients were 67.33±6.17 years with mean PSA level of 9.34±4.34 ng/ml. The number of patients with worsening upgrading, worsening upstaging and worsening prognosis were 42 (10.77%), 83 (21.28%) and 108 (27.7%), respectively. In analysis compared between upgrading group and non-upgrading group, there was no difference in patient’s features. However, in analysis on upstaging and worsening prognosis, serum PSA (p=0.029, p=0.042) and %positive biopsy core (p=0.010, p=0.013) showed significant difference. In univariable analysis, serum PSA (p=0.030, p=0.042) and %positive biopsy core (p=0.004, p=0.014) were predictive of upstaging and worsening prognosis, also, in multivariable analysis, serum PSA (p=0.016) and %positive biopsy core (p=0.042) were statistically relevant factors of worsening upstaging. Conclusions: In this study, 27.7% of patients with preoperative intermediate-risk prostate cancer were re-stratified into high-risk prostate cancer group after RP. Serum PSA and %positive biopsy core were the predictive factors for migrating to high risk group.
안성열,임동훈,조용근 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.3
The zygoma is located at the midlateral portion, forms the malar eminence in the face and the two adjacent bones, the zygomatic arch and inferior portion of the infraorbital rim are relatively weaker than other facial bones, and as a result, the zygoma is highly incidental to multiple traumas. In the past, Gillies method?(temporal approach) was used commonly for the treatment of zygoma fractures but now open reuction and internal fixation is the treatment of choice because the zygoma fractures are frequently diplaced by muscle pulling. Dingman method?, 2 points fixation, has now been used more favorably since the advent of the miniplate which can more effectively resist the deforming force than wire. Accurate anatomic restoration of the displaced zygomatic arch to the original site is important because the zygomatic arch is the key site to establish the zygomatic contour and antero-posterior projection of the face. In case of zygoma fractures, accurate reduction and stable fixation under the direct vision of fracture sites becomes significant after thorough study through the axial C-T scans. In our series, we operated 26 cases of displaced zygoma tripod fracture and the results was relatively good. Thus, we concluded that exact anatomic restoration using the coronal approach is a safe and definite procedure about the treatment of complex zygoma fracture.
Posterior Calf Fasciocutaneous Flap을 이용한 하지 연부조직의 재건
안성열,임동훈,조용근 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.3
Reconstruction of soft tissue defects of the lower leg and foot continues to challenge plastic surgeons. Significant open wounds of the distal third of the lower leg that require some form of vascularized flap have historically been covered with distant random cross leg flaps, or more appropriately, with micro surgical tissue transfers. Since the clinical work of Ponten in 1981, fasciocutaneous flap has been shown that fascia has a rich vascular plexus. The axial pattern blood supply of the fasciocutaneous flap of the posterior calf was characterized by a dominant subfascial descending cutaneous branch of the popliteal artery. Besides this, the sural and the geniculate artery were composed of this flap. We used the posterior calf fasciocutanous flap in 12 cases of lower extremity reconstruction and obtained satisfactory results except one. We concluded that advantages of this flap are that it is easy to raise, reliable, versatile, and capable of harvesting a broad flap. The addition of this technique in reconstructive surgery has been a very useful in repairing soft tissue defects of lower leg.