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Medical Image Authentication over Public Communication Networks using Secret Watermark
Oh Keun-Tak,Kim Young-Ho,Lee Yun-Bae The Korea Institute of Information and Commucation 2004 Journal of information and communication convergen Vol.2 No.3
The evolution of modern imaging modalities, followed by the rapid development of computer technology has introduced many new features in the communication networks used in medical facilities. Since it is very important to keep patient's record accurately, the ability to exchange medical data securely over the communication network is essential for any medical information. In this paper, therefore, we introduce some problems which occur from digitizing medical images such as MRI (Magnetic Resonance Imaging), CT (Computed Tomography), CR(Computed Radiography), etc., and then we propose a authentication mechanism for medical image verification using secret watermark images.
오근탁 ( Keun-tak Oh ),구제영 ( Jaeyung Gu ),김용호 ( Yunghoo Kim ),이윤배 ( Yun-bee Lee ),이성태 ( Sungtae Lee ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
다양한 분야에서 무선 인터넷 서비스의 가능성이 거론되고 있는 요즘, 무선 인터넷을 통한 의료 정보서비스 또한 관심을 모으고 있다. 모바일 기기를 이용한 의료정보 시스템은 기존 Desktop PC가 가지는 이동성의 제한이라는 단점을 극복하여 이동이 빈번한 의료 정보 사용자에게 정보 이용의 편의성과 신속성을 제공할 것으로 기대된다. 그러나 무선인터넷을 기반으로 하는 모바일 기기는 지속적인 하드웨어의 발전에도 불구하고 정보 처리의 효율성, 무선 네트워크의 불안전성, 보안등의 문제가 지적되고 있다. 의료 정보는 환자의 지극히 개인적인 정보를 취급하는 것으로 환자, 관계 의료진 이외의 사람에게 노출되는 것은 위험스러운 일이라 할 수 있다. 이러한 의료 정보가 진료의 편의성과 신속성, 업무의 효율성을 위하여 모바일 시스템으로 진화하는 경우, 무선 인터넷의 특성에 의한 보안 위협에 노출되게 된다. 따라서 본 논문에서는 모바일 원격 의료 정보 시스템을 구현하는 경우 발생할 수 있는 보안 위협에 대처할 수 있는 모바일 인증 시스템을 제안하고 구현하였다. 제안된 시스템은 모바일 원격 의료 정보 시스템의 환자 정보 보호를 위한 적절한 대안이 될 것으로 기대된다.
오근탁(keun tak Oh),윤홍상(H.S. Yoon),이성태(S.T. Lee) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2C
의료영상은 디지털이라는 속성으로 인해서 일상생활에 적용되는 저작권법으로 저작권을 보호한다는 것이 어렵다. 특히 의료 영상은 복사를 하면 또 하나의 원본이 생성되므로, 의료 영상 이미지를 생산해 내는 사람의 입장에서는 똑같은 원본을 자신도 모르는 사이에 다른 사람에게 전달하게 된다. 그렇게 되면 과연 누가 이 디지털 작품을 만들었는지에 대한 의료 분쟁이 생길 수밖에 없다. 디지털시대의 의료 환경에서 필수 불가결하게 제기될 수 있는 의료영상보안은 특히 우리나라처럼 의료보험의 부당 청구가 사회적인 큰 물의를 일으키고 있는 시점에서 많은 관심과 연구가 필요하다. 따라서 이 분야의 핵심적인 문제점을 도출하고, 문제점 개선을 위해서 워터 마크를 통해 영상 보안 기법을 제안하였다. 그러나 의료영상의 대표적인 특징인 무결성을 보장 받지 못해 법적인 인증에는 한계가 있음을 알 수 있었다.
Oh, Keun-Hwan,Bae, Insung,Lee, Hongkyung,Kim, Hyuk,Kim, Hee-Tak Elsevier 2017 Journal of membrane science Vol.543 No.-
<P><B>Abstract</B></P> <P>Poor proton conduction at low relative humidity (RH) remains a challenge for adopting hydrocarbon (HC) membranes for polymer electrolyte membrane fuel cells (PEMFCs). Here, we report a silica-embedded hydrogel (HG-silica) nanofiller as a water reservoir for improving the performance of the HC membrane under low RH conditions. The incorporation of HG-silica into a sulfonated poly(arylene ether ketone) (SPAEK) membrane increases the proton conductivity at a low RH by an order of magnitude. The power performance under low RH conditions is also improved with the addition of HG-silica to the SPAEK membrane. Therefore, a properly-structured hydrogel nanofiller can provide a way to improve the PEMFC performance under low RH conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A silica-embedded hydrogel nanofiller (HG-silica) is synthesized. </LI> <LI> The HG-silica has a higher water retention capability. </LI> <LI> The addition of HG-silica into SPAEK increases the proton conductivity at a low RH. </LI> <LI> The power performance under low RH conditions is improved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Time Course of Symptom Disappearance after Microvascular Decompression for Hemifacial Spasm
Oh, Eun-Tak,Kim, Eun-Young,Hyun, Dong-Keun,Yoon, Seung-Hwan,Park, Hyeon-Seon,Park, Hyung-Chun The Korean Neurosurgical Society 2008 Journal of Korean neurosurgical society Vol.44 No.4
Objective : This study is to investigate time course of symptom disappearance in patients whose spasm relieved completely after microvascular decompression (MVD). Methods : Of 115 patients with hemifacial spasm (HFS) who underwent MVD from April 2003 to December 2006, 89 patients who had no facial paralysis after operation and showed no spasm at last follow-up more than 1.5 years after operation were selected. Symptom disappearance with time after MVD was classified into type 1 (symptom disappearance right after operation), type 2 (delayed symptom disappearance) and type 3 (unusual symptom disappearance). Type 2 was classified into type 2a (with postoperative silent period) and type 2b (without silent period). Results : Type 1, type 2a, type 2b and type 3 were 38.2%, 48.37%, 124% and 1.1%, respectively. Delayed disappearance group (type 2) was 60.7%. Post-operative symptom duration in all cases ranged from 0 to 900 days, average was 74.6 days and median was 14 days. In case of type 2, average post-operative symptom duration was 115.1 days and median was 42 days. Five and 3 patients required more than 1 year and 2 years, respectively, until complete disappearance of spasm. In type 2a, postoperative silent period ranged from 1 to 10 days, with an average of 24 days. Conclusion : Surgeons should be aware that delayed symptom disappearance after MVD for HFS is more common than it has been reported, silent period can be as long as 10 days and time course of symptom disappearance is various as well as unpredictable.
Influence of Obesity on the Severity and Clinical Outcome of Acute Pancreatitis
( Keun Young Shin ),( Wan Suk Lee ),( Duk Won Chung ),( Jun Heo ),( Min Kyu Jung ),( Won Young Tak ),( Young Oh Kweon ),( Chang Min Cho ) 대한소화기기능성질환·운동학회 2011 Gut and Liver Vol.5 No.3
Background/Aims: Obesity tends to be associated with increased mortality and morbidity in acute pancreatitis. However, in Asian populations, higher morbidity and mortality have been reported in patients with low body mass indexes (BMIs). This study was undertaken to evaluate the relation between obesity and outcome, and to investigate the occurrence of complications by overweightedness in acute pancreatitis. Methods: The medical records of 403 patients with acute pancreatitis were reviewed retrospectively, and Ranson`s scores, modified Glasgow scores, Acute Physiology and Chronic Health Evaluation (APACHE) II scores and computed tomography severity indexes were calculated. Patients were categorized by BMI for the analysis. Results: When compared with normal patients (BMI 18.5 to 22.9), all categories with a BMI ≥23 had an increased risk of developing a severe form of acute pancreatitis (p=0.003) and all categories with a BMI ≥25 significantly predicted severity (p<0.001). Patients with class 1 obesity (BMI 25 to 29.9) developed significantly more systemic and metabolic complications. Conclusions: Overweightedness and obesity were found to be associated with a higher risk of developing severe pancreatitis. Further studies are needed to establish the precise prognostic value of obesity in members of the population with low BMIs. (Gut Liver 2011;5:335-339)
( Keun Young Shin ),( Jun Heo ),( Ji Yeon Kim ),( Sang Jik Lee ),( Se Young Jang ),( Soo Young Park ),( Min Kyu Jung ),( Chang Min Cho ),( Won Young Tak ),( Young Oh Kweon ) 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.2
Radiofrequency ablation (RFA) is performed as an alternative to surgical resection for primary or secondary liver malignancies. Although RFA can be performed safely in most patients, early and late complications related to mechanical or thermal damage occur in 8-9.5% cases. Hemocholecyst, which refers to hemorrhage of the gallbladder, has been reported with primary gallbladder disease or as a secondary event associated with hemobilia. Hemobilia, defined as hemorrhage in the biliary tract and most commonly associated with accidental or iatrogenic trauma, is a rare complication of RFA. Here we report a case of hemocholecyst associated with hemobilia after RFA for hepatocellular carcinoma that was successfully managed by laparoscopic cholecystectomy.
이동근,조이수,민승기,오승환,정창주,이은택 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.2
Dysfunction of the inferior alveolar nerve indicated by various degree of numbness of the lower lip and chin is one of the few drawbacks of mandibular osteotomy, especially Bilateral Sagittal Split Ramus Osteotomy(BSSRO) and genioplasty. Although it has been recorded throughout the history of this techniques, it is true etiology poorly understood. In this study, 22 consecutive patients under class III malocclusiion impression and undergoing orthognathic surgery(BSSRO only 11 case, BSSRO with genioplasty 11 case) were studied using 4 neurosensory test(static light touch, directional discrimination, two-point discrimination, pin pressure nociception) with post OP 1 week, 2 weeks,4 weeks, 8 weeks, 12 weeks, 24 weeks, On control group, 10 members without trauma and nerve damage history, nerve test was accomplished. We concluded majority of patients return of sensation during post operative 24 weeks. Althought immediate nerve deficit are 92.2%, 97.2% 88.9% these are recovered to 25%, 35.72%, 10.71% at 24 weeks. Nerve recovery rate increased prominently between post 4 weeks and 8 weeks. There is no statistically difference about neurosensory deficit among the chin area. Neurosensory deficit more severe when the BSSRO with genioplasty group than the only BSSRO group. Immediate neurosensory deficit is larger left side than right side but after 6 months, there is no significantly difference between left side and right side. Static light touch and pin pressure nociception are more sensitive method of neurosensory deficit than two point discrimination.