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녹내장이 발생한 Sturge-Weber 증후군 환자의 임상양상과 수술성적
박재휘,임수호,차순철,Jae Hwi Park,Su Ho Lim,Soon Cheol Cha 대한안과학회 2013 대한안과학회지 Vol.54 No.11
Purpose: To report clinical manifestations including neurocutaneous and ocular findings and to evaluate outcomes of trabeculectomy in patients with Sturge-Weber syndrome. Methods: The medical records of 10 eyes of 8 glaucoma patients with Sturge-Weber syndrome who were followed up for at least 1 year after trabeculectomy were reviewed retrospectively. We analyzed neurocutaneous and ocular findings, cumulative surgical success rates, and complications in patients with Sturge-Weber syndrome. Results: The mean patient age at the time of surgery was 12.6 ± 13.0 years and mean follow-up period was 71.6 ± 81.8 months. All patients showed various clinical findings including facial hemangioma (8 patients), seizure (6 patients), intracranial lesion (6 patients), developmental delay (4 patients), conjunctival/episcleral hemangioma (4 eyes), and choroidal hemangioma (4 eyes). Postoperative success was achieved in 8 out of 10 eyes (80.0%). Postoperatively, serous retinal detachment occurred in 2 out of 4 eyes with preoperative diffuse choroidal hemangioma. Conclusions: Management of glaucoma associated with Sturge-Weber syndrome requires multidisciplinary treatment because of systemic involvement. Trabeculectomy appears to be an effective and relatively safe surgical option for glaucoma associated with Sturge-Weber syndrome. However, serious complications such as serous retinal detachment should be considered when planning trabeculectomy for patients with diffuse choroidal hemangioma. J Korean Ophthalmol Soc 2013;54(11):1737-1747
Recurrent Painful Ophthalmoplegic Neuropathy: a Case Report
박재휘,이호규,고명주,오정환,박성주 대한자기공명의과학회 2019 Investigative Magnetic Resonance Imaging Vol.23 No.2
Upon review, it is noted that recurrent painful ophthalmoplegic neuropathy (RPON) is a rare neurological syndrome characterized by recurrent unilateral headaches and painful ophthalmoplegia of the ipsilateral oculomotor nerve. As seen on brain MRI, thickening and enhancement of the oculomotor cranial nerve can be observed in these cases. We experienced a case of RPON in an adult patient who showed thickening and enhancement of the oculomotor nerve on gadolinium-enhanced 3D-FLAIR image. The authors report a case of RPON with a review of the literature.
Cavernous Hemangioma of the Gallbladder: a Case Report
박재휘,이정섭,최국명,김봉수,김승형,김정재,김두리,현창림,허규희 대한자기공명의과학회 2019 Investigative Magnetic Resonance Imaging Vol.23 No.3
Cavernous hemangioma of the gallbladder is an extremely rare benign tumor. The tumor has only a few cases being reported in literature. However, to the best of our knowledge, no reports focusing on the MRI findings of cavernous hemangioma of the gallbladder have been published. This study reports a case of gallbladder hemangioma with pathologic and radiologic reviews, including MRI findings.
Finding Top-k Answers in Node Proximity Search Using Distribution State Transition Graph
박재휘,이상구 한국전자통신연구원 2016 ETRI Journal Vol.38 No.4
Considerable attention has been made for processing graph data in recent years. Efficient method on how to compute node proximity is one of the most challenging problems for many applications such as recommendation systems and social networks. Regarding large-scale, mutable datasets and user queries, top-k query processing gains much interest. This paper presents a novel method to find top-k answers in node proximity search based on the well-known measure, Personalized PageRank (PPR). First, we introduce Distribution State Transition Graph (DSTG) to depict iterative steps of solving the PPR equation. Second we propose a weight distribution model of DSTG to capture the states of intermediate PPR scores and their distribution. Using DSTG, we can selectively follow and compare the multiple random paths with different lengths to find the most promising nodes. Moreover, we prove the results of our method are equivalent to the PPR results. The comparative performance studies using two real data sets clearly show that our method is practical and accurate.
Toeplitz and Hankel operators with Carleson measure symbols
박재휘 대한수학회 2022 대한수학회논문집 Vol.37 No.1
In this paper, we introduce Toeplitz operators and Hankel operators with complex Borel measures on the closed unit disk. When a positive measure $\mu$ on $(-1,1)$ is a Carleson measure, it is known that the corresponding Hankel matrix is bounded and vice versa. We show that for a positive measure $\mu$ on $\mathbb{D}$, $\mu$ is a Carleson measure if and only if the Toeplitz operator with symbol $\mu$ is a densely defined bounded linear operator. We also study Hankel operators of Hilbert--Schmidt class.
박재휘,김록원,조현성,한지형,지수영,Park, J.H.,Kim, R.W.,Cho, H.S.,Han, J.H.,Chi, S.Y. 한국전자통신연구원 2015 전자통신동향분석 Vol.30 No.5
최근, 미래 제조업의 성장 동력과 그에 대한 중요성이 화두가 되면서 제조업과 예측분석 기술의 융합을 통해 선제적 제조 활동 개선을 위한 의사결정을 지원하는 예측적 생산 시스템에 대한 관심이 증가하고 있다. 예측적 생산 시스템은 데이터의 수집과 저장/관리, 예측적 분석을 위한 다양한 단계의 기술요소들로 구성된다. 본고에서는 각 단계를 위한 기술개발의 현황 및 적용 사례들에 관하여 살펴보고자 한다.
박재휘,양병주,이상구 한국전자거래학회 2011 한국전자거래학회 학술대회 발표집 Vol.2011 No.4
최근, 웹을 통한 상품 거래에 있어서 단일 문서가 아닌, 연관 상품 카탈로그, 사용자 거래 명세 등을 비롯한 연결 관계를 가진 문서의 집합이 의미 있는 정보로 활용되고 있다. 하지만, 기존 검색어 기반 가중치 함수는 검색 결과 단위를 하나의 문서로만 가정하고 있기 때문에 하이퍼링크와 같은 링크구조에 기반하여 연결된 문서 집합에 대해서는 효과적인 가중치 값을 구하는데 어려움이 있다. 이 논문은 링크기반 문서구조를 고려한 새로운 검색어 가중치 함수를 제안한다. 먼저, 검색어가 포함된 문서 집합 내 링크 구조와 문서의 중복을 고려하여 새로운 정규화 지수를 정의한다. 그리고 정의된 정규화 지수를 사용하여 기존의 TF-IDF 함수를 확장하여 링크기반 문서구조에 적합한 새로운 검색어 가중치 함수를 제안한다.