PDE 기반의 이미지 인페인팅을 이용한 시신경 원판 경계 검출에 관한 연구

김태형,김성현,김진만,공재응,김두영,Kim, Tae-Hyoung,Kim, Seng-Hyen,Kim, Jin-Man,Gong, Jae-Woong,Kim, Doo-Young 한국융합신호처리학회 2007 융합신호처리학회 논문지 (JISPS) Vol.8 No.4

본 논문은 실명(loss of eyesight)의 원인 중 하나인 녹내장의 진행과 진단 등의 의료 정보제공을 목적으로 양방향 곡선 전개 방식을 이용하여 망막 영상에서 시신경 원판(optic disk)의 경계를 검출하는 방법을 제안한다. 정확한 경계 검출을 위하여 PDE 기반의 Image inpainting 방법으로 시신경 원판 위를 지나는 혈관을 제거하고 전처리 과정에서 발생하는 잡음제거와 경계의 보존을 위해 비등방성 필터링(anisotropic filtering)을 행한다. 혈관이 제거된 망막 영상에서 시신경 원판의 경계 검출은 초기 곡선에 강인한 양방향 곡선 방식으로 검출한다. 실험결과, 제안한 방법이 전체영상의 블러링 현상뿐만 아니라 시신경 원판 경계의 블러링 현상을 줄일 수 있었고, 기존의 방법에 비하여 정확한 경계를 검출할 수 있었다. This paper describes a technique for detecting the boundary of the optic disk in digital image of the retina using inward and outward curve evolution. Optic disk boundary offers medical information about glaucoma progresses. For accurate boundary detection, image inpainting based on PDE removes blood vessels crossing the optic disk. For removing noises and preserving boundary of optic disk in image inpainting process, the anisotropic diffusion filtering is developed. After pre-processing, the optic disk boundary is determined using inward and outward curve evolution. Experimental results show that blurring effect of original region and optic disk boundary is reduced considerably. By the proposed method, we can detect correct disk boundary compare to conventional method.

최근 5년간 원발성 남성불임증 환자의 임상적 분석

김태형,김경도,김세철,Kim, Tae-Hyoung,Kim, Kyung-Do,Kim, Sae-Chul 대한생식의학회 1994 Clinical and Experimental Reproductive Medicine Vol.21 No.3

A clinical investigation was undertaken on primary male infertility patients of recent 5 years. The results obtained were as follow: 1. Suspective etiologic factors were: 1) testicular failure, 36.1 %; 2) varicocele, 18.7%; 3) endocrine abnormality, 13.5%; 4) obstruction, 13.5%; 5) idiopathic, 10.9%; 6) cryptorchidism, 2.6%; 7) necrospermia, 0.9%. 2. On semen analyses, azoospermia was found in 55.8%, single abnormal parameter in 21.5 %, and multiple/all abnormal parameter in 22.7% of the 163 cases. 3. For the evaluation of the sensitivity and specificity of noninvasive variables in predict in obstruction as the cause of azoospermia in patient who had undergone testicular biopsy, the testicular size and serum follicle-stimulating hormone(FSH) level revealed 100% of sensitivity. 4. Among the 43 patients with a testicular biopsy confirmed diagnosis there was a significant difference in testicular size, ejaculate volume(p<0.0001) and serum FSH(p<0.0001) between patients with testicular failure and those with ductal obstruction. 5. Of 93 treated patients with primary male infertility, 42 were managed by medical treatment including endocrine treament, retrograde ejaculation treatment, infection treatment and observation; 29 were managed by surgical treatment including varicocelectomy, vasovasostomy, vasoepididymostomy and TUR of ejaculatory duct; 20 were managed by sperm preparation treatment including artificial insemination(AI), electroejaculation plus AI and vibration ejaculation plus AI ; 2 were managed by microscopic epididymal sperm aspiration plus IVF, repectively. 6. 42 patients who could be followed-up, 21 patients(50%) impregnated their wives.

선천성 영아 섬유육종

김태형,정재희,송영택,Kim, Tae-Hyoung,Chung, Jae-Hee,Song, Young-Tack 대한소아외과학회 2004 소아외과 Vol.10 No.1

A newborn male baby was transferred to our hospital with a left inguinal mass. The mass was huge measuring $10{\times}10cm$, engorged, and dark-blue colored as a result of internal hemorrhage. Unstable vital signs were combined with DIC and acute renal failure. Emergency operation was performed because of the suspicion of bowel perforation. The peritoneal cavity was full of ascitis and the distal jejunum had a 0.5 cm perforation. Segmental resection of the jejunum and incisional biopsy of the inguinal mass were performed. On pelvic and thigh MRI, the mass protruded into pelvic cavity and encircled large vessels and nerves of the thigh. Pathologic diagnosis was congenital infantile fibrosarcoma. Fifteen days after operation, primary tumor excision was undertaken. The second look operation, performed after 6 times VAC chemotherapy, revealed no remained malignant cell on microscopic section. The baby has been followed closely for the last eight months.

콘크리트 전과정 $CO_2$ 배출량 및 경제성 평가 시스템(SUSB-CLAS) 개발

김태형,박정훈,태성호,Kim, Tae-Hyoung,Park, Jung-Hoon,Tae, Sung-Ho 대한건축학회 2011 대한건축학회논문집 Vol.27 No.12

The main reason of the earth global warming is $CO_2$ and the regulation about it in the whole world has been reinforced to reduce $CO_2$ emission. It is needed that we should reduce it in the process at the production of concrete generated much of $CO_2$ emission as the primary material of construction industry recognized unfriendly environment industry. Based on a concrete, this study was constructed the Assessment system of $CO_2$ emission and economical efficiency in the life cycle of concrete to evaluate $CO_2$ emission generated in the stage of material production, transportation, manufacture using optimal design techniques. This study evaluates $CO_2$ emission and economical efficiency of ready-mixed concrete according to producing companies or standards, using the proposed program in this study, which is the assessment program of $CO_2$ emission and economical efficiency in the life cycle of concrete(SUSB-CLAS). $CO_2$ emission basic unit and economical efficiency DB in various concrete types are constructed throughout this study and will be used for prediction of $CO_2$ emission and economical efficiency in concrete industry and for fundamental resource for reducing $CO_2$ emissions.

대단면 급속시공을 위한 최적의 곡면막장형상개발에 관한 현장실험

김태형,윤지선,Kim, Tae-hyoung,Yoon, Ji-sun 한국터널지하공간학회 2006 터널기술 Vol.8 No.1

기존의 NATM과 같은 터널공법에서는 불착 직후 벽연은 숏크리트나 록볼트에 의하여 지지되기 때문에 재래공법과 비교하여 암반의 느슨함을 감소시킬 수 있으나, 막장은 통상 무지보 상태로 놓여있기 때문에 붕괴의 위험성을 항상 내포하고 있는 것이 현실이다 현재 국내 터널시공시에는 막장이 굴진방향에 직립합A로써 응력의 집중이 발생하며 또한 막장의 안정성을 우려하여 단연분할공법을 채택하는 것이 일반적 공법으로 되어왔다. 그러나 이러한 방법은 경제적우로 큰 부당이 되며 공사기간 연장의 한 원인이 된다. 따라서 곡연막장 굴착공법을 개발하여 적용한다면 보다 나은 응력상태를 유지할 수 있어 1회 불진장의 증대 및 분할공법을 피함으로써 공사비절감 및 공사기간 단측에 매우 유리할 것이라 판단된다. In this study, NATM can reduce the loosened ground near the tunnel face more than the other pre-existing tunnelling methods, because of rapid supporting by means of shotcrete and rock bolts. However, this method sometimes can not help for a unstable tunnel face with a unsupported caondition. In order to keep from that dangerous case, some excavation methods such as bench cut and drift advancing method are introduced, despite of high construction cost and period. So, this thesis is intended to introduce the new tunnel face shape, that is concave shaped face, and discusses its effects on the tunnel stabilization.

Glass Fiber Post와 Composite Resin Core의 전단결합강도

김태형,심준성,이근우,Kim Tae-Hyoung,Shim June-Sung,Lee Keun-Woo 대한치과보철학회 2005 대한치과보철학회지 Vol.43 No.4

Statement of problem : Fracture of composite resin core will be occulted by progress of crack. Bonding interface of different materials has large possibility of starting point of crack line. Therefore, the bond strength of glass fiber post to composite resin core is important for prevention of fracture. Purpose: This in vitro study tried to find out how to get the higher strength of glass fiber post to composite resin core through surveying the maximum load that fractures the post and cote complex. Materials and methods: 40 specimens made with glass fiber Posts(Style $post^{(R)}$, Metalor, Swiss) and composite resin core ($Z-100^{(R)}$, 3M, USA) were prepared and loaded to failure with push-out type shear-bond strength test in a universal test machine. The maximum fracture load and fracture mode were investigated in the specimens that were restored with four different surface treatments. With the data. ANOVA test was used to validate the significance between the test groups, and Bonferroni method was used to check if there is any significant statistical difference between each test group. Evely analysis was approved with 95% reliance. Results: On measuring the maximum fracture load of specimens, both the treatments of sandblasted and acid-etched one statistically showed the strength increase rather than the control group (p<0.005). The scanning electric microscope revealed that sand blasting made more micro-retention form not only on the resin matrix but on the glass fiber, and acid-etching contributed to increase in surface retention form, eliminated the inorganic particles in resin matrix. Specimen fracture modes investigation represented that sand blasted groups showed lower bonding failure than no-sand blasted groups. Conclusion: Referring to the values of maximum fracture load of specimens, the bonding strength was increased by sand blasting and acid-etching.

지속가능한 콘크리트의 개발을 위한 에코효율성 평가방법 제안

김태형,채창우,Kim, Tae-Hyoung,Chae, Chang-U 한국건설순환자원학회 2016 한국건설순환자원학회지 Vol.11 No.4

낙동강 하구 화전지구 연약지반에 작용하는 피압수압 측정사례

김태형,유재명,이명재,배기현,정두석,Kim, Tae-Hyoung,Yu, Jae-Myung,Lee, Myung-Jae,Bae, Ki-Hyun,Jeong, Doo-Suk (사)한국토질및기초기술사회 2006 기술발표회 Vol.2006 No.-

Artesian Pressure exists in Hwa Jeon Project Site of Nakdong Delta Area. Maxium value of the pressure ranges between 06 tonf/m2 and 1 3 tonf/m2 in the design site. This paper presents a design case study considering the Artesian Pressure to calculate the consolidation settlement of the deep marine clay.

순환골재가 혼입된 콘크리트의 환경부하(온실가스) 평가를 위한 기초연구

김태형,Tae-Hyoung Kim 한국건설순환자원학회 2023 한국건설순환자원학회지 Vol.18 No.1

백석면이 함유된 천정텍스의 화학적 처리 및 재활용 기술

김태형,송태협,장경필,Kim, Tae-Hyoung,Song, Tae-Hyeb,Jang, Kyong-Pil 한국건설순환자원학회 2020 한국건설순환자원학회지 Vol.15 No.4