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( Sung-woo Ahn ),( Nam-joon Yi ),( Kyung-chul Yoon ),( Hyo-sin Kim ),( Suk-kyun Hong ),( Hyeyoung Kim ),( Jin-young Choi ),( Joon Koo Han ),( Min Uk Kim ),( Hyo-cheol Kim ),( Kwang-woong Lee ),( Kyung 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Pediatric liver transplantation (PLT) has been the key therapy for end stage liver disease and the outcome has been excellent. However, still surgical complication associated with small recipient is the main cause of graft loss. In the present study, we assessed recent advances in outcome of PLTs through our experience. Methods: A total of 237 PLTs performed between Mar 1988 and July 2015 were analyzed. Three chronological periods were investigated: the initial period (1988-2007, n=117), the mid-term period in which our PLT management protocol was settled down (2008-2011, n=61), and the period in which surgical procedures were refined for small children (2012-2015, n=59). Results: The grafts’ (84% vs. 82% vs. 98%) and patients’ (84% vs. 87% vs. 98%) survival have been improved (p<0.05), whereas the proportion of Child class C (12% vs. 21% vs. 34%), the proportion of deceased donor (25% vs. 41% vs. 54%), and split PLT (15%vs. 20% vs. 39%) increased (p<0.05). The incidence of surgical complication has been improved, especially in hepatic artery (4% vs. 12% vs. 0%) but there was no significance. ABO incompatible PLT has introduced on the last period (9%). Conclusions: The quality of the PLT has recently been standardized through a large volume of experience, and the operation has been proven to improve the survival outcome. However, a constant evaluation of our experience is critical for further progress.
A prototype of digital photogrammetric algorithm for estimating roughness of rock surface
Hyo-Sung Lee,Ki-Won Ahn 한국지질과학협의회 2004 Geosciences Journal Vol.8 No.3
This study introduces the efficiency of using prototype digital photogrammetry for measuring the roughness of rock surfaces, employing digital stereo images obtained from a high resolution Kodak DCS 420 non-metric digital camera and a Rolleiflex 6006 metric film camera. To measure the surface roughness of test objects in the case of non-topographic applications, reference surfaces are mathematically estimated using the least squares method. The roughness processing capability of a digital camera and a metric film camera is evaluated using an arbitrarily chosen reference surface on the sample being studied. Then the results are compared with the measurements obtained using a laser profilometer. The RMS roughness and Z2s parameters estimated using the DCS 420 non-metric digital camera ranges from 0.001 mm to 0.067 mm and from 0.007 to 0.073, when compared to the laser profilometer values. In the case of the Rolleiflex 6006 metric film camera, the RMS and the Z2s parameters range from 0.010 mm to 0.056 mm and from 0.005 to 0.031. The prototype photogrammetric algorithm is consequently suitable for measuring rock surface roughness.
Ahn, Sanghyun,Park, Yang Jin,Min, Sang-Il,Kim, Seong Yup,Ha, Jongwon,Kim, Sang Joon,Kim, Hyo-Soo,Yoon, Byung-Woo,Min, Seung-Kee The Korean Academy of Medical Sciences 2012 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.27 No.6
<P>This prospective study surveyed the prevalence of peripheral arterial disease (PAD) in Korean patients with coronary arterial disease (CAD) or cerebrovascular disorder (CVD). From March 2010, 576 hospitalized patients in cardiovascular or stroke center were enrolled as the study group. Ankle-brachial index (ABI) was measured and the cut-off point for diagnosing PAD was ≤ 0.9 at rest. A total of 424 hospitalized patients in the Department of Surgery and aged ≥ 50 yr was enrolled as the control group. The prevalence of PAD was significantly higher in the study group than the control group (7.6% vs 1.7%; <I>P</I> < 0.001). To analyze the relationship of other vascular diseases and PAD, the patients were regrouped; group A (no CAD or CVD), group B (CAD only), group C (CVD only), and group D (CAD and CVD). Compared with group A, those with other vascular diseases (group B, C, D) had significantly higher prevalence of PAD, diabetes, dyslipidemia, renal insufficiency and claudication. The trend that patients with CAD or CVD are at risk of PAD is observed in this cross-sectional study in Koreans. Routine ABI measurement is recommended in these high-risk groups for early detection and proper management of PAD.</P>
Obturator schwannoma: Two cases of report and literature review
( Hyo-eun Kim ),( Jin-young Choi ),( Hyun-jin Rho ),( Soo-jeong Lee ),( Jun-woo Ahn ),( Sang-hun Lee ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Schwannomas are nerve sheath tumors that usually affect the head, neck and the flexor surfaces of the extremities. These are usually slow growing tumors and are often detected incidentally. These tumors are usually solid but may undergo necrosis and cystic degeneration. It is rare to find a schwannoma in the retroperitoneal cavity. We present our clinical experience with benign retroperitoneal schwannomas in two patients who underwent surgical excision. Surgical treatment of schwannomas are challenging to achieve complete resection of them without an unexpected injury to urinary, digestive, reproductive and neurogenic system. In the first case, we report laparoscopic management of an obturator nerve schwannoma in a 40-year-old woman with right lower abdominal pain. CT and MRI revealed a mass 40mm in diameter in the right obturator fossa, suggesting a retroperitoneal tumor. Because CT and MRI revealed clear continuity with the right obturator nerve, this case was preoperatively diagnosed as an obturator nerve schwannoma. Tumor enucleation was performed by laparoscopy. In the second case, total transabdominal hysterectomy and retroperitoneal mass excision was performed due to large symptomatic uterine myoma and concurrent left retroperitoneal mass. On intraoperative exploration, the mass was noted to be contiguous with the obturator nerve, either invading into the nerve or arising from the nerve itself. The final pathology of the two cases resulted in benign schwannoma. The patients had no complications and neurologic deficits. There were no evidences of recurrence for one-year follow-up. Preoperative diagnosis of obturator nerve schwannomas is quite difficult, but careful inspection of CT and MRI is important to identify the original nerve of schwannoma preoperatively. Laparoscopic resection is a good treatment option in suspicious isolated schwannoma in retroperitoneal space.
Gyroless attitude estimation of sun-pointing satellites using magnetometers
Ahn, Hyo-Sung,Lee, Seon-Ho IEEE 2005 IEEE geoscience and remote sensing letters Vol.2 No.1
Deterministic attitude estimation methods based on vector observations are used for the coarse-attitude calculation of the sun-pointing satellites. The objective of the deterministic attitude estimation is to get the direction cosine matrix without considering the stochastic noises. The existing deterministic attitude estimation methods require two complete (three-axis) vector observations corresponding to two known reference vectors. This letter suggests a new deterministic attitude estimation method using only geomagnetic-field measurements on two axes for sun-pointing satellites in the sun-acquisition mode.