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The Outcomes of Pituitary Apoplexy with Conservative Treatment: Experiences at a Single Institution
Seo, Youngbeom,Kim, Yong Hwy,Dho, Yun-Sik,Kim, Jung Hee,Kim, Jin Wook,Park, Chul-Kee,Kim, Dong Gyu Elsevier 2018 World neurosurgery Vol.115 No.-
<P><B>Objective</B></P> <P>Pituitary apoplexy is an unpredictable complication caused by hemorrhage or infarction in a pituitary adenoma. We retrospectively analyzed the radiologic and clinical outcomes of patients with conservatively managed pituitary apoplexy.</P> <P><B>Methods</B></P> <P>A total of 32 patients who had undergone conservative treatment with high-dose corticosteroid replacement were enrolled in this study. This cohort study consisted of 20 male and 12 female patients. The median patient age was 60 years. Five patients had a previously diagnosed pituitary tumor, and one third of the patients had a history of hypertension.</P> <P><B>Results</B></P> <P>The median follow-up duration was 50 months. The median tumor volumes at the initial and final assessments were 2.75 cm<SUP>3</SUP> (range, 0.32–10.7 cm<SUP>3</SUP>) and 0.64 cm<SUP>3</SUP> (range, 0–8.74 cm<SUP>3</SUP>), respectively. Complete radiographic regression occurred in 9 of the 32 patients, partial regression occurred in 14 patients, and no change in size or progression occurred in 9 patients. Eighteen of the 32 patients had visual disturbances at the initial presentation; in this subgroup, 17 patients showed improvement over the course of the study. One patient had newly developed diplopia related to tumor progression. Nineteen of the 32 patients had ≥1 hormonal deficiency at the initial assessment, 8 of whom recovered to normal endocrine status. Three patients developed a new hormonal deficiency during the follow-up, and 3 patients experienced tumor recurrence.</P> <P><B>Conclusions</B></P> <P>This study showed the regression of tumors related to pituitary apoplexy, with favorable ophthalmologic and endocrinologic recovery. Conservative management should be considered in patients without severe or progressive neuro-ophthalmic deficits.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated the radiologic and clinical outcome of 32 patients with consertavtively treated pituitary apoplexy. </LI> <LI> Conservative management resulted in acceptable neuro-ophthalmic and endocrinologic outcomes. </LI> <LI> Tumor volume pattern within 1–3 three months after apoplexy might be an important prognostic factor of tumor regression. </LI> <LI> Conservative management should be considered if the visual disturbance has not deteriorated. </LI> </UL> </P>
자율주행환경에서 PQC 적용분석을 위한 V2Verifier 분석 및 확장
김영범(YoungBeom Kim),서석충(Seog Chung Seo) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
V2Verifier는 자율주행환경에서 사용되는 V2V 통신의 보안을 평가하기 위한 오픈소스 테스트베드이다. 본 논문에서는 V2Verifier의 구조를 분석하고, NIST 양자내성암호 공모전의 결선 전자서명 알고리즘인 Crystals-Dilithium과 Falcon을 자율주행 통신장비 중 하나인 Jetson Xavier 환경에서 V2Verifier에 확장한다.
Giant Intradiploic Epidermoid Cyst in the Occipital Bone: A Case Report
( Yoonhee Choo ),( Youngbeom Seo ),( Joonhyuk Choi ) 대한뇌종양학회 대한신경종양학회 2021 Brain Tumor Research and Treatment Vol.9 No.1
Epidermoid cysts are uncommon intracranial tumors. As one of the extradural types of epidermoid cysts, intradiploic epidermoid cysts are even rarer tumors and occur in any part of the skull. We herein report a rare case of a giant intradiploic epidermoid cyst of the occipital bone. A 57-year-old woman presented with a 1-year history of localized headache in the occipital area. CT and MRI showed an extradural mass measuring 50×70 mm in the occipital bone with bony destruction. The patient underwent surgical resection. The tumor was completely removed with its capsule. There was no extension to the intradural space. The pathological report confirmed that the tumor was an epidermoid cyst. Follow- up MRI 24 months after the operation showed no recurrence. The headache was well controlled without any medications. We report a rare case of intradiploic epidermoid cyst with clinical and radiologic features and surgical treatment. It is important to consider this diagnosis for a patient with persistent regional headache with or without a growing scalp mass.
Hyuk-Jin Oh,Youngbeom Seo,Yoon-Hee Choo,Young Il Kim,Kyung Hwan Kim,Sae Min Kwon,Min Ho Lee,정규하 대한신경외과학회 2022 Journal of Korean neurosurgical society Vol.65 No.2
Objective : Chronic subdural hematoma (CSDH) is a common disease in neurosurgical departments, but optimal perioperative management guidelines have not yet been established. We aimed to assess the current clinical management and outcomes for CSDH patients and identify prognostic factors for CSDH recurrence. Methods : We enrolled a total of 293 consecutive patients with CSDH who underwent burr hole craniostomy at seven institutions in 2018. Clinical and surgery-related characteristics and surgical outcomes were analyzed. The cohort included 208 men and 85 women. Results : The median patient age was 75 years. Antithrombotic agents were prescribed to 105 patients. History of head trauma was identified in 59% of patients. Two hundred twenty-seven of 293 patients (77.5%) had unilateral hematoma and 46.1% had a homogenous hematoma type. About 70% of patients underwent surgery under general anesthesia, and 74.7% underwent a single burr hole craniostomy surgery. Recurrence requiring surgery was observed in 17 of 293 patients (5.8%), with a median of 32 days to recurrence. The postoperative complication rate was 4.1%. In multivariate analysis, factors associated with CSDH recurrence were separated hematoma type (odds ratio, 3.906; p=0.017) and patient who underwent surgery under general anesthesia had less recurrence (odds ratio, 0.277; p=0.017). Conclusion : This is the first retrospective multicenter generalized cohort pilot study in the Republic of Korea as a first step towards the development of Korean clinical practice guidelines for CSDH. The type of hematoma and anesthesia was associated with CSDH recurrence. Although the detailed surgical method differs depending on the institution, the surgical treatment of CSDH was effective. Further studies may establish appropriate management guidelines to minimize CSDH recurrence.
CPU 환경에서 최신 경량 암호 GIFT-COFB의 최적화 및 속도 개선과 구현
최용렬(YongRyeol Choi),김영범(YoungBeom Kim),서석충(Seog Chung Seo) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
경량암호는 가용 자원이 제한된 환경에서 효율적으로 동작할 수 있는 암호 알고리즘이다. NIST(National Institute of Standards and Technology)는 제한된 환경에서 사용하기에 적합한 경량암호 알고리즘을 평가, 선정 및 표준화하는 공모전인 LWC(LightWeight Cryptography) 프로젝트를 진행하고 있다. GIFT는 LWC 결선 진출 알고리즘 중 하나로 64/128-bit의 보안 강도를 갖는다. 본 논문에서는 CPU 환경에서 GIFT 레퍼런스 코드의 성능 개선과 최적화 방안을 제시한다. 본 논문에서 제시한 최적화 구현 방안을 적용했을 때, 기존 레퍼런스 코드보다 암호화 과정에서 최대 3.12배 빠르게 작동한다. GIFT의 관련 데이터로 인증된 암호 방식(Authenticated Encryption with Associated Data, AEAD)인 GIFT-COFB(COmbined FeedBack)에 적용했을 때도 최대 2.98배 빠르게 작동한다.
NIST PQC Round 3 격자 기반 암호의 부채널 대응 기법 동향 분석
송진교(JinGyo Song),김영범(YoungBeom Kim),곽유진(Yujin Kwak),서석충(Seog Chung Seo) 한국정보보호학회 2021 情報保護學會誌 Vol.31 No.1
NIST(National Institute of Standards and Technology) 양자 내성 암호 표준화 사업이 3차 라운드에 접어들면서, 3라운드 후보자에 대한 실제 구현 결과 및 관심이 꾸준히 증가하고 있다. 3라운드 후보자 중 대부분(5/7)은 격자 기반 암호이며, 격자 기반 암호는 다른 기반의 양자 내성 암호보다 효율적인 연산 처리로 인해 제약적인 리소스를 가진 임베디드 환경에서도 적용이 가능한 장점이 존재한다. 그러나 특히 임베디드 환경에서는 암호 알고리즘이 동작 시 발생하는 추가적인 정보(전력, 전자파, 시간차, 오류주입 등)를 이용한 부채널 공격에 취약하다. 실제 다수의 연구가 양자 내성 암호의 부채널 공격에 대한 가능성을 제시하고 있다. 여전히 부채널 공격은 양자 내성 암호를 표준화하기 위해 상당한 장애물이며, 이에 대응하기 위해서는 구현 시 부채널 대응 기법이 적용되어야 한다. 따라서 본 논문에서는 NIST PQC 3라운드 격자 기반 암호의 부채널 대응 방안에 대한 최신 동향을 분석한다, 또한 향후, NIST PQC 3라운드 격자 기반 암호의 연구 전망을 논의한다.
32-bit RISC-V 프로세서에서 국산 블록 암호 성능 밴치마킹
곽유진(YuJin Kwak),김영범(YoungBeom Kim),서석충(Seog Chung Seo) 한국정보보호학회 2021 정보보호학회논문지 Vol.31 No.3
5G를 포함한 통신 산업이 발전함에 따라, 모바일 임베디드 시스템을 위한 특수목적의 초소형 컴퓨터인 SoC(System on Chip)의 개발이 증대되고 있다. 이에 따라, 산업체와 기업들의 기술 설계의 패러다임이 변화하고 있다. 기존의 공정은 기업들이 마이크로 아키텍처를 구매하였다면, 지금은 ISA (Instruction Set Architecture)를 사들여, 기업이 직접 아키텍처를 설계한다. RISC-V는 축소 명령어 집합 컴퓨터 기반의 개방형 명령어 집합이다. RISC-V는 모듈화를 통하여 확장이 가능한 ISA를 탑재했으며, 현재 전 세계적 기업들의 지원을 통하여 ISA의 확장 버전 등이 개발되고 있다. 본 논문에서는 RISC-V에서 국산 블록 암호 ARIA, LEA, PIPO에 대하여 성능 벤치마킹과 분석 결과를 제공한다. 또한, RISC-V의 기본 명령어 집합과 특징을 활용한 구현 방법을 제안하고 성능을 논의한다. As the communication industry develops, the development of SoC (System on Chip) is increasing. Accordingly, the paradigm of technology design of industries and companies is changing. In the existing process, companies purchased micro-architecture, but now they purchase ISA (Instruction Set Architecture), and companies design the architecture themselves. RISC-V is an open instruction set based on a reduced instruction set computer. RISC-V is equipped with ISA, which can be expanded through modularization, and an expanded version of ISA is currently being developed through the support of global companies. In this paper, we present benchmarking frameworks ARIA, LEA, and PIPO of Korean block ciphers in RISC-V. We propose implementation methods and discuss performance by utilizing the basic instruction set and features of RISC-V.