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Appendiceal Crohn's disease clinically presenting as acute appendicitis

World Journal of Clinical Cases 2014年第12期2卷 888-892页

作者： Hulin Han hyunsung kim Abdul Rehman Se Min Jang Seung Sam Paik Department of Pathology College of Medicine Hanyang University Seoul 133-792 South Korea

AIM: To determine the incidence of appendiceal Crohn's disease(CD) and to summarize the characteristic histologic features of appendiceal ***: We reviewed the pathology files of 2179 appendectomy specimens from January 2007 to May2013. The computer-assisted retrieval search facility was utilized to collect specimens. We selected those cases that were diagnosed as CD or chronic granulomatous inflammation and defined the final diagnosis according to the histologic findings of CD, including transmural lymphocytic inflammation, non-caseating epithelioid granulomas, thickening of the appendiceal wall secondary to hypertrophy of muscularis mucosa,mucosal ulceration with crypt abscesses, mucosal fissures, and fistula formation. RESULTS: We found 12 cases(7 male and 5 female patients, with an average age of 29.8 years) of appendiceal CD. The incidence of appendiceal CD was 0.55%.The chief complaints were right lower quadrant pain,abdominal pain, lower abdominal pain, and *** duration of symptom varied from 2 d to 5 *** histologic review revealed appendiceal wall thickening in 11 cases(92%), transmural inflammation in all cases(100%), lymphoid aggregates in all cases(100%), epithelioid granulomas in all cases(100%), mucosal ulceration in 11 cases(92%), crypt abscesses in 5 cases(42%), perforation in 2 cases(17%), muscular hypertrophy in 1 case(8%), neural hyperplasia in 5 cases(42%), and perpendicular serosal fibrosis in 8 cases(67%).CONCLUSION: A typical and protracted clinical course, unusual gross features of the appendix and the characteristic histologic features are a clue in the diagnosis of appendiceal CD.

关键词： Appendix Appendectomy Acute appendicitis Crohn’s disease Prognosis

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Security Considerations on Three-Factor Anonymous Authentication Scheme for WSNs

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Journal of Computer and Communications 2021年第3期9卷 1-9页

作者： hyunsung kim Beaton Ofesi Denice Kapito Schoolof Computer Science Kyungil University Kyungbuk Republic of Korea Mathematical Sciences Department Chancellor College University of Malawi Zomba Malawi Malawi Adventist University Ntcheu Malawi

Wireless sensor networks (WSNs) are used to monitor various environmental conditions including movement, pollution level, temperature, humidity, and etc. Secure authentication is very important for the success of WSNs. Li et al. proposed a three-factor anonymous authentication scheme in WSNs over Internet of things (IoT). They argued that their authentication scheme achieves more security and functional features, which are required for WSNs over IoT. Especially, they insisted that their user authentication scheme provides security against sensor node impersonation attack, and resists session-specific temporary information attack and various other attacks. However, this paper shows some security weaknesses in Li et al.’s scheme, especially focused on sensor node masquerading attack, known session-specific temporary information attack and deficiency of perfect forward secrecy. Especially, security considerations are very important to the modern IoT based applications. Thereby, the result of this paper could be very helpful for the IoT security researches.

关键词： Security Considerations on Three-Factor Anonymous Authentication Scheme for WSNs

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Modeling Secure Home Area Network Based on IoT for Resource Constraints Environment

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Journal of Computer and Communications 2020年第1期8卷 45-70页

作者： Minsu Park Mwawi Kayuni Tiwonge Manda hyunsung kim Department of Computer Science Chancellor College University of Malawi Zomba Malawi Mathematical Sciences Department Chancellor College University of Malawi Zomba Malawi Department of Cyber Security Kyungil University Kyungbuk Korea

The Internet of things (IoT) can be used in our daily life. Home area network (HAN) is one of the applications of loT. However, deploying HAN for underdeveloped countries in Africa is not easy due to the lack of Internet connectivity and stable electricity. First of all, Internet in Africa is growing fast but the majority of countries in Africa have Internet penetration of less than 10%. Furthermore, the problem of accessing electricity varies greatly across African countries, which is still less than 30% of the average usage rate. The aim of this paper is to model a secure HAN based on IoT for resource constraints environment, which are focused on both network connectivity and energy stability. Poor connectivity, the prevalence of low-end devices and several other obstacles should be considered for the secure HAN deployment in developing and underdeveloped countries. The proposed HAN model will provide the resource constraints module composed of network connectivity function and energy stability function to support the two constraints based on the IoT basic module and the security and privacy module. The proposed HAN model could be securely applied to various countries HAN applications with poor electricity supply and network connectivity.

关键词： Home Area Network Security Privacy Internet of Things Delegation

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Cytomegalovirus enteritis with jejunal perforation in a patient with endometrial adenocarcinoma

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World Journal of Clinical Cases 2013年第7期1卷 220-223页

作者： Young Jin Jun Jongmin Sim Hye In Ahn Hulin Han hyunsung kim Kijong Yi Abdul Rehman Se Min Jang Kiseok Jang Seung Sam Paik Department of Pathology College of Medicine Hanyang University

Cytomegalovirus(CMV) infection of the gastrointestinal tract has been reported most frequently in the setting of immunodeficiency. The whole gastrointestinal tract can be affected; however, the small bowel is rarely affected. We report a case of CMV enteritis with jejunal perforation in a 53-year-old woman with a history of chemoradiation therapy for endometrial cancer 8 years previously. At follow-up evaluation, lower abdominal pain, diarrhea and vomiting appeared. Abdominal computed tomography showed intra-abdominal free air in the subphrenic space and porta hepatis. The jejunal segment revealed serosal purulent exudates with a perforation. The resected jejunal segment showed a large geographic ulcerative mucosal lesion. The microscopic findings revealed a diffuse ulcerative mucosal change with a prominent granulation tissue formation and many large atypical vascular endothelial cells and stromal fibroblasts with intranuclear or intracytoplasmic inclusion bodies. These cells were positive for CMV antibody. The final diagnosis was CMV-associated jejunitis with a jejunal perforation.

关键词： Cytomegalovirus Enteritis Jejunum Perforation

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A Case Report of a Sarcomatoid Carcinoma Arising in the Renal Pelvis with Exuberant Osteosarcomatous Element

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Open Journal of Pathology 2013年第2期3卷 96-98页

作者： Hye In Ahn Jongmin Sim Hulin Han hyunsung kim Kijong Yi Young Jin Jun Abdul Rehman Se Min Jang Kiseok Jang Seung Sam Paik Department of Pathology College of Medicine Hanyang University Seoul South Korea.

Sarcomatoid carcinoma is a rare malignant tumor that has both malignant epithelial and mesenchymal components. We describe a sarcomatoid carcinoma arising in the right renal pelvis of a 68-year-old man. The dominant component of the tumor was osteosarcomatous, but there were also focal carcinomatous areas. The sarcomatous tumor cells produced abundant osteoid matrix surrounded by osteoblastic cells. The carcinomatous tumor cells consisted of papillary urothelial carcinoma. Immunohistochemical assay showed that the sarcomatous tumor cells were positive for vimentin and negative for cytokeratin. The papillary urothelial carcinoma was positive for cytokeratin and negative for vimentin. After surgery, the patient underwent adjuvant chemotherapy. Four months later, he presented with recurrence in the right subphrenic area and metastasis in the right middle lobe of the lung.

关键词： Sarcomatoid Carcinoma Osteosarcoma Pelvis Kidney

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Improved formaldehyde gas sensing properties of well-controlled Au nanoparticle-decorated In2O3 nanofibers integrated on low power MEMS platform

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Journal of Materials Science & Technology 2020年第3期38卷 56-63页

作者： Dongha Im Donghyun kim Dasol Jeong Woon Ik Park Myoungpyo Chun Joon-Shik Park Hyunjung kim hyunsung Jung Nano Materials&Nano Technology Center Korea Institute of Ceramic Engineering&TechnologyJinju 52851Republic of Korea Department of Mineral Resources and Energy Engineering Chonbuk National UniversityJeonju 54896Republic of Korea Smart Sensor Research Center Korea Electronic Technology InstituteSeongnam 13509Republic of Korea

Approaches for the fabrication of a low power-operable formaldehyde(HCHO)gas sensor with high sensitivity and selectivity were performed by the utilization of an effective micro-structured platform with a micro-heater to reach high temperature with low heating power as well as by the integration of indium oxide(In2O3)nanofibers decorated with well-dispersed Au nanoparticles as a sensing *** In2O3 nanofibers with the large specific surface area were prepared by the electrospinning following by calcination *** nanoparticles with the well-controlled size as a catalyst were synthesized on the surface of In2O3 *** Au-decorated In2O3 nanofibers were reliably integrated as sensing materials on the bridge-type micro-platform including micro-heaters and *** micro-platform designed to maintain high temperature with low power consumption was fabricated by a microelectromechanical system(MEMS)*** micro-platform gas sensor consisting with Au-In2O3 nanofibers were fabricated effectively to detect HCHO gases with high sensitivity and *** HCHO gas sensing behaviors were schematically studied as a function of the gas concentration,the size of the adsorbed Au nanoparticles,the applied power to raise the temperature of a sensing part and the kind of target gases.

关键词： Gold nanoparticle In2O3 nanofiber Formaldehyde Gas sensor Low power Micro-platform

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Calculations of Forming Limit Diagrams for Changing Strain Paths on the Formability of Sheet Metal

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Journal of Materials Science & Technology 2001年第1期17卷 141-142页

作者： hyunsung Sou Graduate School of Mechanical Eng., Kyungpook National University, Korea Youngsuk kim Dept. of Mechanical Eng., Kyungpook National University, Korea Graduate Sch. of Mech. Eng. Kyungpook Natl. Univ. Kyungpook South Korea

In the press shop of most sheet metals, sheet material undergoes complex strain path and also the formability of the sheet material was limited by the stretchability of the material. Therefore, the precise prediction of path-dependent FLD based on M-K approach using generalization of Hill's 1979 anisotropic yield criterion and introducing a strain gradient effect in the constitutive equation. Also, the theoretically obtained FLD will be compared with experimental data for steel sheets.

关键词： Sheet Metal sheet material strain gradient effect constitutive equation experimental data yield criterion steel sheets strain path

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