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홍제범 ( Je Beom Hong ),홍창기 ( Chang Ki Hong ),이규성 ( Kyu Sung Lee ),윤선옥 ( Sun Och Yoon ) 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2011 대한뇌종양학회지 Vol.10 No.2
We present a case of spinal accessory nerve cavernous hemangioma. A 44-year-old male patient visited our hospital because a mass at his foramen magnum had been found during a medical checkup. A magnetic resonance (MR) image revealed a well-enhanced mass in the foramen magnum, with displacement of the medulla oblongata to the left side by this mass. The lesion was resected using a far-lateral approach, and the pathological diagnosis was a cavernous hemangioma. Although cranial nerve cavernous hemangioma is a rare condition, it should be considered when making differential diagnoses of foramen magnum masses.
홍제범(Je Beom Hong),김한규(Han Kyu Kim),김주평(Joo Pyung Kim),장종희(Jong Hee Chang),문인석(In Seok Moon) 대한두개저학회 2017 대한두개저학회지 Vol.12 No.2
Background: The infratemporal fossa approach type A (ITFA-A) is a good approach for small jugular foramen tumors with a small extraforaminal cervical extension. On the other hand, the posterolateral approach to jugular foramen has been adopted to see the posterior aspect of the jugular foramen. For large tumors, we combined posterolateral approach with various otologic operations including ITFA-A, transcochlear approach and fallopian bridge technique. The purpose of this study is to evaluate the surgical adequacy of our approaches including postoperative complications and outcomes. Methods: From January 2014 to January 2017, we operated total 14 cases of jugular foramen tumors. We chose the surgical approach to these tumors based on their location and extent. And the facial nerve manipulation was added in combined approach in which facial nerve was dissected and transpositioned (3 cases) or remained in fallopian canal (fallopian bridge technique, 3 cases). Results: Grossly total resection was achieved in 12 patients (85.7%). Immediate postoperative lower cranial nerve deficit occurred in 10 patients (71.4%). Postoperative facial nerve paralysis and hearing impairment occurred in 4 patients (28.6%) and 6 patients (42.9%) respectively. Two-thirds of the jugular foramen could be exposed in the combined approach which enabled the complete removal of tumors regardless of the size at this area. Conclusion: Using skull base technique with thorough understanding of surrounding anatomic structures followed in wider exposure, gross total removal can be achieved by multidirectional approach under relative safety.
APACHE II와 외과계 집중치료실 환자의 예후와의 관계
홍순찬,김상범,박순태,하우송,정태섭,제정인 대한외상학회 1993 大韓外傷學會誌 Vol.6 No.2
Since its introduction by Knaus et al., the Acute Physiology and Chronic Health Evaluation (APACHE) II scoring system has been used in a wide variety of conditions and scenarios from general ICUs to more specific areas. The Acute Physiology and Chronic Health Evaluation (APACHE) II score is a measure of physiologic derangement, chronic health status, and patient age that correlates with patient outcome in large groups of ICU patients. The application of APACHE II has been further refined by the calculation of a disease-specific risk of dying and the ability to compare predicted deaths with actual deaths and thereby, to contrast the performance of different hospitals. The purpose of this study was to analyze the relationship between APACHE II score and prognosis in patients admitted to a surgical ICU. The records of 66 patients admitted to surgical intensive care unit in Gyeong-Sang National University Hospital from Jan. 1990 to Jul. 1992 were reviewed. In the patient with low APACHE II score (below 14 points), there was no mortality. But with high APACHE II score (above 15 points), there was mortality. There was a good relationship between the APACHE II score and mortality. So APACHE II scoring system is useful in measuring the severity of acute disease and predicting the outcome.
( Hong In Yoon ),( Chan Woo Wee ),( Young Zoon Kim ),( Youngbeom Seo ),( Jung Ho Im ),( Yun-Sik Dho ),( Kyung Hwan Kim ),( Je Beom Hong ),( Jae-Sung Park ),( Seo Hee Choi ),( Min-Sung Kim ),( Jangsup 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2021 Brain Tumor Research and Treatment Vol.9 No.1
Background There have been no guidelines for the management of adult patients with diffuse midline glioma (DMG), H3K27M-mutant in Korea since the 2016 revised WHO classification newly defined this disease entity. Thus, the Korean Society for Neuro-Oncology (KSNO), a multidisciplinary academic society, had begun preparing guidelines for DMG since 2019. Methods The Working Group was composed of 27 multidisciplinary medical experts in Korea. References were identified through searches of PubMed, MEDLINE, EMBASE, and Cochrane CENTRAL using specific and sensitive keywords as well as combinations of keywords. As ‘diffuse midline glioma’ was recently defined, and there was no international guideline, trials and guidelines of ‘diffuse intrinsic pontine glioma’ or ‘brain stem glioma’ were thoroughly reviewed first. Results The core contents are as follows. The DMG can be diagnosed when all of the following three criteria are satisfied: the presence of the H3K27M mutation, midline location, and infiltrating feature. Without identification of H3K27M mutation by diagnostic biopsy, DMG cannot be diagnosed. For the primary treatment, maximal safe resection should be considered for tumors when feasible. Radiotherapy is the primary option for tumors in case the total resection is not possible. A total dose of 54 Gy to 60 Gy with conventional fractionation prescribed at 1-2 cm plus gross tumor volume is recommended. Although no chemotherapy has proven to be effective in DMG, concurrent chemoradiotherapy (± maintenance chemotherapy) with temozolomide following WHO grade IV glioblastoma’s protocol is recommended. Conclusion The detection of H3K27M mutation is the most important diagnostic criteria for DMG. Combination of surgery (if amenable to surgery), radiotherapy, and chemotherapy based on comprehensive multidisciplinary discussion can be considered as the treatment options for DMG.
A Study of a Nonlinear Viscoelastic Model for Elastomeric Bushing in Radial Mode
Seong Beom Lee,Jong-Keun Choi,Je-Hong Min 한국정밀공학회 2004 International Journal of Precision Engineering and Vol.5 No.2
An elastomeric bushing is a device used in automotive suspension systems to reduce the load transmitted from the wheel to the frame of the vehicle. The relation between the load applied to the shaft or sleeve and the relative displacement of elastomeric bushing is nonlinear and exhibits features of viscoelasticity. A load-displacement relation for elastomeric bushing is important for dynamic numerical simulations. A boundary value problem for the bushing response leads to the load-displacement relation, which requires complex calculations. Therefore, by modifying the constitutive equation for a nonlinear viscoelastic incompressible material developed by Lianis, the data for the elastomeric bushing material was obtained and this data was used to derive the new load-displacement relation for radial response of the bushing. After the load relaxation function for the bushing was obtained from the step displacement control test, Pipkin-Rogers model was developed. Solutions were allowed for comparison between the results of the modified Lianis model and those of the proposed model. It was shown that the proposed Pipkin-Rogers model was in very good agreement with the modified Lianis model.
Tumor Heterogeneity Predicts Metastatic Potential in Colorectal Cancer
Joung, Je-Gun,Oh, Bo Young,Hong, Hye Kyung,Al-Khalidi, Hisham,Al-Alem, Faisal,Lee, Hae-Ock,Bae, Joon Seol,Kim, Jinho,Cha, Hong-Ui,Alotaibi, Maram,Cho, Yong Beom,Hassanain, Mazen,Park, Woong-Yang,Lee, American Association for Cancer Research 2017 Clinical Cancer research Vol.23 No.23
<P><B>Purpose:</B> Tumors continuously evolve to maintain growth; secondary mutations facilitate this process, resulting in high tumor heterogeneity. In this study, we compared mutations in paired primary and metastatic colorectal cancer tumor samples to determine whether tumor heterogeneity can predict tumor metastasis.</P><P><B>Experimental Design:</B> Somatic variations in 46 pairs of matched primary-liver metastatic tumors and 42 primary tumors without metastasis were analyzed by whole-exome sequencing. Tumor clonality was estimated from single-nucleotide and copy-number variations. The correlation between clinical parameters of patients and clonal heterogeneity in liver metastasis was evaluated.</P><P><B>Results:</B> Tumor heterogeneity across colorectal cancer samples was highly variable; however, a high degree of tumor heterogeneity was associated with a worse disease-free survival. Highly heterogeneous primary colorectal cancer was correlated with a higher rate of liver metastasis. Recurrent somatic mutations in <I>APC, TP53</I>, and <I>KRAS</I> were frequently detected in highly heterogeneous colorectal cancer. The variant allele frequency of these mutations was high, while somatic mutations in other genes such as <I>PIK3CA</I> and <I>NOTCH1</I> were low. The number and distribution of primary colorectal cancer subclones were preserved in metastatic tumors.</P><P><B>Conclusions:</B> Heterogeneity of primary colorectal cancer tumors can predict the potential for liver metastasis and thus, clinical outcome of patients. <I>Clin Cancer Res; 23(23); 7209–16. ©2017 AACR</I>.</P>
SVM-based series arc detection algorithm for photovoltaic system
Jae-Beom Ahn,Seung-Jae Jeong,Hong-Je Ryoo 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
In this paper, we present a SVM-based series arc detection algorithm for photovoltaic system. SVM is a technique of extracting a hyperplane that maximizes the margin between series arc fault samples and normal state samples from training dataset and arc noise can be effectively classified using the extracted hyperplane. As input parameters for SVM, various DWT-based feature parameters are used. The hyperplane for determining the class is obtained on initial step, and this is applied to the arc detection algorithm for SVM testing. The real-time arc detection test is performed through TMS320f28335 DSP. It is verified that not only the series arc can be successfully detected with SVM-based algorithm, but also the detection time is satisfied the required detection time of the UL1699B safety standards.
독실라민 중독시 발생할 수 있는 발작의 특성과 위험인자
송범수 ( Beom Soo Song ),이기만 ( Ki Man Lee ),김선욱 ( Sun Wook Kim ),유제성 ( Je Sung You ),정태녕 ( Tae Nyung Chung ),박유석 ( Yoo Seok Park ),정성필 ( Sung Phil Jung ),구홍두 ( Hong Du Goo ),박인철 ( In Cheol Park ) 대한임상독성학회 2010 대한임상독성학회지 Vol.8 No.2
Purpose: Doxylamine is antihistamine drug that is used as a hypnotic. It is also used for suicidal attempts because it can be easily purchased at the pharmacy without a prescription. There were many articles about the complications after doxylamine intoxication such as a rhabdomyolysis, but only a few articles have reported on seizure. We reviewed the cases of doxylamine intoxication with seizure that were treated in the emergency department. Methods: We reviewed the medical records of the patients who were over 15 years old and who were intoxicated by doxylamine at 3 emergency medical centers from January 2006 to June 2010. We reviewed the patients’age, gender, the dose of doxylamine ingested, if gastrointestinal decontamination was done, the time from intoxication to hospital arrival, the seizure history, treatment of seizure, the electroencephalography (EEG) results, the brain computed tomography (CT) results and the blood test results. Results: There were 168 patients who were intoxicated by doxylamine during the study period. Twelve patients had a seizure episode. The differences between the patients who developed seizure and the patients who did not were the dose and the serum levels of sodium and creatinine. The only clinically meaningful difference was the amount of doxylamine. The amount of doxylamine ingested (>29 mg/kg) predicted the development of seizure with a sensitivity of 75% and a specificity of 92% on the ROC curve. One patient among the seizure patients expired in the emergency department. Conclusion: In case of doxylamine intoxicated patients, there is close relationship between seizure and ingested amount, so close observation needs to be done for the patients who ingest too much because doxylamine can cause death. Further prospective studies are needed for doxylamine intoxicated patients with a seizure episode.