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Journal of Hydrodynamics 2011年第5期23卷 607-614页

作者： HONG Taehyup kim chang Nyung Department of Mechanical Engineering Graduate School Kyung Hee UniversityYongin Korea Department of Mechanical Engineering College of Engineering Kyung Hee University Yongin Korea

The effects of implantation angles of Bileaflet Mechanical Heart Valves （BMHVs） on the blood flow and the leaflet motion are investigated in this paper. The physiological blood flow interacting with the moving leaflets of a BMHV is simulated with a strongly coupled implicit Fluid-Structure Interaction （FSI） method based on the Arbitrary-Lagrangian-Eulerian （ALE） approach and the dynamic mesh method （remeshing） in Fluent. BMHVs are widely used to be implanted to replace the diseased heart valves, but the patients would suffer from some complications such as hemolysis, platelet activation, tissue overgrowth and device failure. These complications are closely related to both the flow characteristics near the valves and the leaflet dynamics. The current numerical model is validated against a previous experimental study. The numerical results show that as the rotation angle of BMHV is increased the degree of asymmetry of the blood flow and the leaflet motion is increased, which may lead to an unbalanced force acting on the BMHVs. This study shows the applicability of the FSI model for the interaction between the blood flow and the leaflet motion in BMHVs.

关键词： mechanical heart valve rotational implantation blood flow leaflet motion fluid-structure interaction

Chemical ablation of the gallbladder using alcohol in cholecystitis after palliative biliary stenting

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World Journal of Gastroenterology 2009年第16期15卷 2041-2043页

作者： Tae hoon Lee Sang-Heum Park Sang Pil kim Ji-Young Park chang Kyun Lee Il-Kwun Chung Hong Soo kim Sun-Joo kim Division of Gastroenterology Department of Internal MedicineSoonchunhyang University College of MedicineCheonan Hospital

Chemical ablation of the gallbladder is effective in patients at high risk of complications after surgery. Percutaneous gallbladder drainage is an effective treatment for cholecystitis; however, when the drain tube cannot be removed because of recurrent symptoms, retaining it can cause problems. An 82-year-old woman presented with cholecystitis and cholangitis caused by biliary stent occlusion and suspected tumor invasion of the cystic duct. We present successful chemical ablation of the gallbladder using pure alcohol, through a percutaneous gallbladder drainage tube, in a patient who developed intractable cholecystitis with obstruction of the cystic duct after receiving a biliary stent. Our results suggest that chemical ablation therapy is an effective alternative to surgical therapy for intractable cholecystitis.

关键词： Percutaneous cholecystostomy Cholecystitis Biliary stenting Alcohol Chemical therapy

Evaluation of non-ampullary duodenal polyps: Comparison of non-neoplastic and neoplastic lesions

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World Journal of Gastroenterology 2010年第43期16卷 5474-5480页

作者： Sung hoon Jung Woo Chul Chung Eun Jung kim Seol Hye kim chang Nyol Paik Bo In Lee Young Seok Cho Kang-Moon Lee Department of Internal Medicine College of Medicine The Catholic University of Korea

AIM: To evaluate duodenal polyps, divided into nonneoplastic and neoplastic lesions. In addition, the clinical characteristics of duodenal hyperplastic polyps are determined. METHODS: We analyzed medical records of 50 114 consecutive patients submitted to for first diagnostic esophago-gastroduodenoscopy between January 2004 and December 2009. We excluded lesions on the ampulla of Vater and submucosal tumors. We studied 510 cases that were diagnosed endoscopically with duodenal polyps and enrolled a total of 221 cases that had undergone tissue biopsy. We analyzed the differences between non-neoplastic and neoplastic lesions, and determined the clinical features of duodenal hyperplastic polyps. RESULTS: Non-neoplastic lesions were found in 196 patients and neoplastic lesions in 25 patients. On uni-variate analysis, there were significant differences in shape, location, and size. Polyps more than 10 mm in diameter or polyps in the second portion had independent risk factors for being neoplastic lesions, as identified by multivariate analysis. In 23 cases of hyperplastic polyps (79.3%), they were accompanied by gastroduodenal pathology, which was possibly associated with Helicobacter pylori . CONCLUSION: Polyps of more than 10 mm or polyps in the second portion of the duodenum should be evaluated by histological examination.

关键词： Duodenum Polyp Helicobacter pylori

An Efficient Scheduling Scheme for Fronthaul Load Reduction in Fog Radio Access Networks

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China Communications 2019年第11期16卷 146-153页

作者： Sovit Bhandari Hong Ping Zhao hoon kim IoT and Big-data Research Center Department of Electronics Engineering Incheon National University

Fog radio access network(F-RAN) is one of the key technology that brings cloud computing benefit to the future of wireless communications for handling massive access and high volume of data traffic. The high fronthaul burden of a typical cellular system can be partially diminished by utilizing the storage and signal processing capabilities of the F-RANs, which is still not desirable as user throughput requirement is in the increasing trend with the increment of the internet of things(IoT) devices. This paper proposes an efficient scheduling scheme that minimizes the fronthaul load of F-RAN system optimally to improve user experience, and minimize latency. The scheduling scheme is modeled in a way that the scheduler which provides the lower fronthaul load while fulfilling the minimum user throughput requirement is selected for the data transmission process. Simulation results in terms of user selection fairness, outage probability, and fronthaul load for a different portion of user equipments(UEs) contents in fog access point(F-AP) are shown and compared with the most common scheduling scheme such as round robin(RR) scheme to validate the proposed method.

关键词： fog radio access networks fog access points fronthaul load user throughput

Microbiota or short-chain fatty acids: which regulates diabetes?

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Cellular & Molecular Immunology 2018年第2期15卷 88-91页

作者： chang H kim Department of Comparative Pathobiology and Biological Sciences Laboratory of Immunology and HematopoiesisWeldon School of Biomedical EngineeringPurdue Institute of InflammationImmunology and Infectious DiseasesPurdue Center for Cancer ResearchPurdue UniversityWest Lafayette47907INUSA

Diabetes mellitus,with sustained high-sugar levels in the blood,has been steadily rising in prevalence *** 12–14%of the US population has been diagnosed with diabetes in recent years.1 One major reason for the rise of diabetes is dietary *** consumption of processed carbohydrates with inadequate consumption of dietary fiber(DF)has been recognized as a major risk factor for diabetes,as hypothesized several decades ago by Trowell.

关键词： diabetes sustained dietary

Gallbladder Removal Simulation for Laparoscopic Surgery Training: A Hybrid Modeling Method

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Journal of Computer Science & Technology 2013年第3期28卷 499-507页

作者： Youngjun kim Dongjune chang Jungsik kim Sehyung Park Center for Bionics Korea Institute of Science and Technology Department of Mechanical Engineering Korea Advanced Institute of Science and Technology

Laparoscopic surgery has many advantages, but it is difficult for a surgeon to achieve the necessary surgical skills. Recently, virtual training simulations have been gaining interest because they can provide a safe and efficient learning environment for medical students and novice surgeons. In this paper, we present a hybrid modeling method for simulating gallbladder removal that uses both the boundary element method （BEM） and the finite element method （FEM）. Each modeling method is applied according to the deformable properties of human organs： BEM for the liver and FEM for the gallbladder. Connective tissues between the liver and the gallbladder are also included in the surgical simulation. Deformations in the liver and the gallbladder models are transferred via connective tissue springs using a mass-spring method. Special effects and techniques are developed to achieve realistic simulations, and the software is integrated into a custom-designed haptic interface device. Various computer graphical techniques are also applied in the virtual gallbladder removal laparoscopic surgery training. The detailed techniques and the results of the simulations are described in this paper.

关键词： deformable body modeling gallbladder removal laparoscopic surgery training simulation

Comparison of sequential and 7-,10-,14-d triple therapy for Helicobacter pylori infection

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World Journal of Gastroenterology 2012年第19期18卷 2377-2382页

作者： Hyuk Soon Choi hoon Jai Chun Sang hoon Park Bora Keum Yeon Seok Seo Yong Sik kim Yoon-Tae Jeen Soon Ho Um Hong Sik Lee chang Duck kim Ho Sang Ryu Division of Gastroenterology and Hepatology Department of Internal MedicineInstitute of Digestive Disease and NutritionKorea University College of MedicineSeoul 136-705South Korea

AIM:To compare the effectiveness of sequential therapy for Helicobacter pylori(***) infection with that of triple therapy of varying ***:The 460 patients enrolled in this study had ***-associated gastritis or a gastric or duodenal *** screening,***-infected patients were randomly assigned to receive either conventional triple therapy for 7,10 or 14 d,or a new 10-d sequential *** of the 4 treatment groups included 115 *** outcomes of eradication therapy were assessed 4 wk after treatment by the urea breath test and ***:The overall eradication rate was 81.0%,and eradication rates were 75.7% for 7-d conventional triple therapy,81.9% for 10-d conventional triple therapy,84.4% for 14-d conventional triple therapy,and 82.0% for 10-d sequential *** intention-to-treat analysis nor per protocol analysis showed significant differences in eradication rates using sequential therapy or the standard triple therapy(P = 0.416 and P = 0.405,respectively).CONCLUSION:There are no significant differences between 10-d sequential eradication therapy for *** and any duration of standard triple treatment in Korean patients.

关键词： He/icobacter pylori Sequential therapy Triple therapy Gastric ulcer Duodenal ulcer Gastritis

Design of an Information Security Service for Medical Artificial Intelligence

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Computers, Materials & Continua 2022年第1期70卷 679-694页

作者： Yanghoon kim Jawon kim Hangbae chang Department of Cyber Drone Bot Military Engineering Shinhan UniversityUijeongbu-si11644Gyeonggi-doKorea Department of Security Convergence Graduate SchoolChung-Ang UniversityDongjack-gu06974SeoulKorea Department of Industrial Security Chung-Ang UniversityDongjak-gu06974SeoulKorea

The medical convergence industry has gradually adopted ICT devices,which has led to legacy security problems related to ICT ***,it has been difficult to solve these problems due to data resource *** problems can cause a lack of reliability in medical artificial intelligence services that utilize medical ***,to provide reliable services focused on security internalization,it is necessary to establish a medical convergence environment-oriented security management *** study proposes the use of system identification and countermeasures to secure systemreliabilitywhen using medical convergence environment information in medical artificial *** checked the life cycle of medical information and the flow and location of information,analyzed the security threats that may arise during the life cycle,and proposed technical countermeasures to overcome such *** verified the proposed countermeasures through a survey of *** requirements were defined based on the information life cycle in the medical convergence *** also designed technical countermeasures for use in the security management systems of hospitals of diverse sizes.

关键词： Medical artificial intelligence medical information security convergence environment

Enhanced stability and rate performance of zinc-doped cobalt hexacyanoferrate (CoZnHCF) by the limited crystal growth and reduced distortion

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Journal of Energy Chemistry 2022年第6期31卷 649-658,I0018页

作者： Jihwan kim Seong-hoon Yi Li Li Sang-Eun Chun School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina School of Industrial Technology Advances Kyungpook National UniversityDaegu 41566Republic of Korea

Cobalt hexacyanoferrate (CoHCF) is a potential cathode for aqueous Na-ion batteries due to its high theoretical specific capacity (170 m Ah g^(-1));however,its lower rate capability and cyclability limit its *** distortion at a weak N-coordinated crystal field during cycling disintegrates Co,yielding an irreversible *** Zn amounts ranging 0–1 were added to the Co site to suppress the structural irreversibility of CoHCF,yielding Co_(1-x)Zn_(x)HCF powder;this Zn (x≤0.09) addition reduced the powder’s dimension because the lower four coordination of Zn–N,not the six coordination of Co–N,limits the powder ***,a small lattice parameter and interaxial angle (~90°) are obtained,implying that a narrower Co_(1-x)Zn_(x)HCF inner structure is formed to accommodate Na ***,the electronic conductivity of Co_(1-x)Zn_(x)HCF gradually increased within 0–0.09 range.A smaller particle size with a high surface area leads to a near-surface-limited redox process,similar to a capacitive *** the surface-limited reaction and electronic conductivity enhances the reversibility due to the smaller charge transfer resistance at the electrode/electrolyte interface caused by Zn *** redox-active Co with non-active Zn amount of 0.07 (Co_(1-x)Zn_(x)HCF) slightly reduces the specific capacity from 127 to 119 mAh g^(-1)at 0.1 A g^(-1)due to the shrunken Co charging *** performance is enhanced by compromising the capacity and reduced distortion,resulting in 81%retention at a 20-times-faster charging ***,the Co_(1-x)Zn_(x)HCF sample exhibited the good stability while preserving 74%of the initial capacity at 0.5 A g^(-1)after 200 cycles.

关键词： Cobalt hexacyanoferrate Rate capability Stability Growth limitation Structural distortion Near-surface-limited redox process

Bidirectional transfer of quantum information for unknown photons via cross-Kerr nonlinearity and photon-number-resolving measurement

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Chinese Physics B 2016年第2期25卷 82-92页

作者： Jino Heo chang-Ho Hong Dong-hoon Lee Hyung-Jin Yang Graduate School of Information Security (GSIS) Korea University Center for Information Security Technologies (CIST) Korea University Department of Physics Korea University

We propose an arbitrary controlled-unitary （CU） gate and a bidirectional transfer scheme of quantum information （BTQI） for unknown photons. The proposed CU gate utilizes quantum non-demolition photon-number-resolving measure- ment based on the weak cross-Kerr nonlinearities （XKNLs） and two quantum bus beams; the proposed CU gate consists of consecutive operations of a controlled-path gate and a gathering-path gate. It is almost deterministic and is feasible with current technology when a strong amplitude of the coherent state and weak XKNLs are employed. Compared with the existing optical multi-qubit or controlled gates, which utilize XKNLs and homodyne detectors, the proposed CU gate can increase experimental realization feasibility and enhance robustness against decoherence. According to the CU gate, we present a BTQI scheme in which the two unknown states of photons between two parties （Alice and Bob） are mutually swapped by transferring only a single photon. Consequently, by using the proposed CU gate, it is possible to experimentally implement the BTQI scheme with a certain probability of success.

关键词： cross-Kerr nonlinearity quantum non-demolition photon-number-resolving measurement bidirec-tional transfer of quantum information