Anterior Decompression and Fusion for the Treatment of Cervical Myelopathy Caused by Ossification of the Posterior Longitudinal Ligament: A Narrative Review

Park Sehan,Lee Dong-Ho,이춘성,Hwang Chang-Ju,Yang Jae Jun,Cho Jae Hwan 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.3

Occasionally, ossification of the posterior longitudinal ligament (OPLL) causes cord compression, resulting in cervical myelopathy. OPLL differs from other causes of cervical spondylotic myelopathy in several ways, and the surgical strategy should be chosen with OPLL’s characteristics in mind. Although both the anterior and posterior approaches are effective surgical methods for the treatment of OPLL cervical myelopathy, they each have their own set of benefits and drawbacks. Anterior decompression and fusion (ADF) may improve neurological recovery, restore lordosis, and prevent OPLL mass progression. The benefits can be seen in patients with a high canal occupying ratio or kyphotic alignment. We discussed the benefits, limitations, indications, and surgical techniques of ADF for the treatment of OPLL-induced cervical myelopathy in this narrative.

Polyacrylamide injection medium for serial femtosecond crystallography

Jaehyun PARK,Sehan PARK,Jangwoo KIM,Gisu PARK,Yunje CHO,Ki Hyun NAM 한국생물공학회 2019 한국생물공학회 학술대회 Vol.2019 No.4

Does Preoperative Radiation Therapy Performed for Metastatic Spine Cancer at the Cervical Spine Increase Perioperative Complications of Anterior Cervical Surgery?

Jae Hwan Cho,Dong-Ho Lee,Chang Ju Hwang,Jae Woo Park,Jin Hoon Park,Sehan Park 대한정형외과학회 2024 Clinics in Orthopedic Surgery Vol.16 No.2

Background: Radiation therapy (RT) performed before anterior cervical spine surgery (ACSS) may cause fascial plane fibrosis, decreased soft-tissue vascularity, and vertebral body weakness, which could increase the risk of esophageal and major vessel injuries, wound complications, and construct subsidence. Therefore, this study aimed to evaluate whether preoperative RT performed for metastatic spine cancer (MSC) at the cervical spine increases perioperative morbidity for ACSS. Methods: Forty-nine patients who underwent ACSS for treatment of MSC at the cervical spine were retrospectively reviewed. All the patients underwent anterior cervical corpectomy via the anterior approach. Patient demographics, surgical factors, operative factors, and complications were recorded. Results of patients who were initially treated with RT before ACSS (RT group) were compared with those who did not receive RT before ACSS (non-RT group). Results: Eighteen patients (36.7%) were included in the RT group, while the remaining 31 (63.3%) were included in the non- RT group. Surgery-related factors, including operation time (p = 0.109), estimated blood loss (p = 0.246), amount of postoperative drainage (p = 0.604), number of levels operated (p = 0.207), and number of patients who underwent combined posterior fusion (p = 0.768), did not significantly differ between the 2 groups. Complication rates, including esophageal injury, dural tear, infection, wound dehiscence, and mechanical failure, did not significantly differ between the RT and non-RT groups. Early subsidence was significantly greater in the non-RT group compared to that in the RT group (p = 0.012). Conclusions: RT performed before surgery for MSC does not increase the risk of wound complication, mechanical failure, or vital structure injury during ACSS. The surgical procedural approach was not complicated by previous RT history. Therefore, surgeons can safely choose the anterior approach when the number of levels or location of MSC favors anterior surgery, and performing a posterior surgery is unnecessary due to a concern that previous RT may increase complication rates of ACSS.

신뢰가능한 골다공증 진단을 위한 Causal 추론 기술 연구

박지후(Jihoo Park),김세한(Sehan Kim),윤영근(YoungKeun Yoon),이성민(Sung Min Rhee),김성태(Seong Tae Kim) Korean Institute of Information Scientists and Eng 2024 한국정보과학회 학술발표논문집 Vol.2024 No.6

Development of Hybrid Photovoltaic Cells by Incorporating CuInS₂Quantum Dots into Organic Photoactive Layers

Nam, Minwoo,Lee, Sehan,Park, Jaehyun,Kim, Sang-Wook,Lee, Kee-Keun IOP Publishing 2011 Japanese journal of applied physics Vol.50 No.6

감성분석과 SVM을 이용한 인터넷 악성댓글 탐지 기법

홍진주,김세한,박제원,최재현,Hong, Jinju,Kim, Sehan,Park, Jeawon,Choi, Jaehyun 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.2

The Internet has brought lots of changes to us sharing information mutually. However, as all social symptom have double-sided character, it has serious social problem. Vicious users have been taking advantage of anonymity on the Internet, stating comments aggressively for defamation, personal attacks, privacy violation and more. Malicious comments on the Internet are creating the biggest problem regarding unlawful acts and insults which occur on the Internet. In order to solve the issues, several studies have been done to efficiently manage the comments. However, there are limitations to recognize modified malicious vocabulary in previous research. So, in this paper, we propose a malicious comments detection technique by improving limitation of previous studies. The experimental result has shown accuracy of 87.8% providing higher accuracy as compared to previous studies done. 인터넷을 통해 많은 정보를 얻고 많은 정보를 타인에게 제공하면서 개인의 삶의 양식에 큰 변화를 가져다주었다. 모든 사회 현상에는 양면성이 있듯이 인터넷 익명성을 이용하여 명예훼손, 인신공격, 사생활 침해등과 같이 악의적으로 이용하여 사회적으로 심각한 문제를 양산하고 있다. 인터넷 게시판의 악성댓글은 인터넷에서 발생하는 불법적인 언사나 행위와 관련하여 가장 대두되고 있는 문제이다. 이러한 문제를 해결하기 위해 많은 연구가 진행되고 있지만 악성댓글에 사용된 단어들은 변형이 많이 나타나기 때문에 기존 연구들은 이러한 변형된 악성어휘를 인식하는데 한계점이 존재한다. 이에 본 연구에서는 기존 연구의 한계점을 개선하여 악성댓글을 탐지하는 기법을 제안한다. 실험결과 87.8%의 정확도를 나타냈으며, 이는 기존 연구들에 비해 상당히 발전된 결과로 볼 수 있다.

인공어초 단지 주변 해양쓰레기 피해 시민모니터링과 수중 레저활동 접목 방안

우민수(Minsu Woo),곽태진(Taejin Kwak),박요섭(Yoseop Park),홍선욱(Sunwook Hong),임세한(Sehan Lim) 한국해양환경·에너지학회 2022 한국해양환경·에너지학회 학술대회논문집 Vol.2022 No.11

인공어초는 대상 해양생물을 정착시키거나 끌어모으고, 그에 대한 배양과 보호의 목적으로 해저나 해중에 시설하는 인공구조물로 해양생물의 서식환경과 특성을 활용한 대표적인 수산자원 조성 방법이다. 2019년 해양수산부에서 발표한 ‘해양레저관광 활성화 대책’ 중 하나로 인공어초를 포함한 해중 경관이 우수한 해역을 스쿠버다이빙 포인트로 지정하여 운영하고 있다. 그러나 일부 인공어초의 경우 폐어구와 같은 해양쓰레기로 인해 원래의 기능을 상실하고, 어초에 걸린 폐어구는 유령어업을 계속하게 되는 악순환이 이어진다. 현재 해양폐기물 수거 사업은 지자체 중심으로 진행되고 있고, 인공어초 관리에 관한 통합적 자료는 미흡하다. 또한 수거에만 집중되어 발생 시기 및 원인 등과 같은 과학적 자료 역시 부족하다. 해양의 시공간적 특성상 소수의 인력으로 모든 지역을 조사하는 것은 사실상 불가능하며, 이를 보완하기 위한 방법의 하나로 시민과학과의 접목을 제안한다. 최근 스쿠버다이빙과 같은 해양레저스포츠 인구의 증가와 함께 환경보호에 대한 시민의식이 높아지고 있고, 해양의 환경문제에 직접적으로 활동하기를 원하는 사람들이 많아지고 있다. 하지만 현재 국내 해양레저스포츠 인구는 1회성 단순 체험 빈도가 높고 국외 유출 수요가 많다. 이런 스쿠버다이버들에게 수중 쓰레기 밀도 조사 방법인 UDS(Underwater Debris Survey)를 소개하고 인공어초 주변 및 다양한 해양생태계에 오염도를 조사함으로써 시민과학자로서의 역할을 부여하고 지자체에서는 지속적인 해양레저스포츠 인구를 확보하고 인공어초의 관리를 유용하게 할 뿐 아니라 전문연구인력과의 연결을 통해 인공어초 효과 및 관리에 대한 비용효율적인 대안이 될 수 있을 것이라 기대한다. As one of the Marine Leisure Tourism Revitalization Measures announced by the Ministry of Oceans and Fisheries in 2019, underwater areas with excellent scenery, including artificial reefs, have been designated and operated as scuba diving points. However, the original function of reefs is occasionally lost due to marine debris such as abandoned fishing gears, and derelict gears continue a vicious cycle of ghost fishing. Currently, the marine debris collection project is being carried out mainly by local governments, and the integrated data on the management of artificial reefs are insufficient. In addition, scientific data such as the types and cause of marine debris are also lacking. Due to the spatial and temporal characteristics of the ocean, it is virtually impossible to investigate all areas with a small number of people. Recently, along with the increase in the population of marine leisure sports such as scuba diving, public awareness about environmental protection is increasing, and people tend to be directly involved in marine environmental protection activities. However, the current population of domestic marine leisure sports has a high frequency of one-time simple experiences and a high demand for diving tour abroad. The UDS (Underwater Debris Survey), a method of surveying the density of debris deposited or sunken on the sea bottom can give scuba divers a role as citizen scientists by investigating pollution levels around artificial reefs and various marine ecosystems. It is expected that it will be a cost-effective alternative to the effectiveness and management of artificial reefs through the connection of professional researchers and scuba divers as citizen scientists.

EdgeX Foundry에서 MQTT 기반의 ZigBee 프로토콜 지원 방안

이승환(Seunghwan Lee),판민린안(Linh-An Phan),박대헌(Dae-Heon Park),김세한(Sehan Kim),김태홍(Taehong Kim) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.6

Preoperative Radiographic Simulation for Partial Uncinate Process Resection during Anterior Cervical Discectomy and Fusion to Achieve Adequate Foraminal Decompression and Prevention of Vertebral Artery Injury

Yang Jae Jun,Kim Ho-Jun,Lee Jin Bog,Park Sehan 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.6

Study Design: Retrospective radiographic study.Purpose: This study aims to demonstrate the proper resection trajectory of a partial posterior uncinate process resection combined with anterior cervical discectomy and fusion (ACDF) and evaluate whether foraminal stenosis or uncinate process degeneration increases the risk of vertebral artery (VA) injury.Overview of Literature: Appropriate resection trajectory that could result in sufficient decompression and avoid vertebral artery injury is yet unknown.Methods: We retrospectively reviewed patients who underwent cervical magnetic resonance imaging and computed tomography angiography for preoperative ACDF evaluation. The segments were classified according to the presence of foraminal stenosis. The height, thickness, anteroposterior length, horizontal distance from the uncinate process to the VA, and vertical distance from the uncinate process baseline to the VA of the uncinate process were measured. The distance between the uncinate anterior margin and the resection trajectory (UAM-to-RT) was measured.Results: There were no VA injuries or root injuries among the 101 patients who underwent ACDF (163 segments, mean age of 56.3±12.2). Uncinate anteroposterior length was considerably longer in foramens with foraminal stenosis, whereas uncinate process height, thickness, and distance between the uncinate process and VA were not significantly associated with foraminal stenosis. There were no significant differences in radiographic parameters based on uncinate degeneration. The UAM-to-RT distances for adequate decompression were 1.6±1.4 mm (range, 0–4.8 mm), 3.4±1.7 mm (range, 0–7.1 mm), 4.0±1.7 mm (range, 0–9.0 mm), and 4.5±1.2 mm (range, 2.5–7.5 mm) for C3–C4, C4–C5, C5–C6, and C6–C7, respectively.Conclusions: More than half of the uncinate process in the anteroposterior plane should be removed for adequate neural foramen decompression. Foraminal stenosis or uncinate degeneration did not alter the relative anatomy of the uncinate process and the VA and did not impact VA injury risk.

Enabling Horizontal Pod Autoscaler alongside with ElasticFog

Le Hoang Phuc,Linh-An Phan,Dae-Heon Park,Sehan Kim,Taehong Kim 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.6