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- 저자 : 이재학(Jae Hack Lee) (검색결과 6 건)
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이재학,김범태,조성진,신원한,최순관,변박장,Lee, Jae-Hack,Kim, Bum-Tae,Cho, Sung-Jin,Shin, Won-Han,Choi, Soon-Kwan,Byun, Bark-Jang 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.1
Pneumocephalus is exceedingly rare in the absence of trauma or recent surgery. It is most commonly seen after severe head injury, with disruption of the dura and subsequent cerebrospinal fluid leakage. Intracranial air has also been reported as a complication of shunting. This may be secondary to intermittent shunt failure or a persistent communication between the extracranial and intracranial space that permits the entrance of air. In the present case, air appeared to enter the ventricular system through the fistula that connected the frontal sinus. This air replaced the CSF being drained into the peritoneal cavity by the shunt. The decrease of intracranial pressure after a shunt might play a role in causing pneumocephalus. We report a case of tension pneumocephalus after shunting for hydrocephalus as a life-threatning complication.
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다중 애플리케이션 처리를 위한 경량 인공지능 하드웨어 기반 통합 프레임워크 연구
전석훈(Seok-Hun Jeon),이재학(Jae-Hack Lee),한지수(Ji-Su Han),김병수(Byung-Soo Kim) 한국전자통신학회 2019 한국전자통신학회 논문지 Vol.14 No.5
경량 인공지능 하드웨어는 다양한 문제의 해결을 위해 멀티모달 센서 데이터를 입력받아 특징 선택, 추출, 차원축소, 정규화 과정을 수행한 후 인공지능 엔진으로 예측 결과를 도출한다. 다양한 애플리케이션에서 높은성능을 달성하기 위해서는 이러한 경량 인공지능 하드웨어의 초 매개변수와 전체적인 전처리 시스템의 구성을 데이터에 맞춰 최적화할 필요가 있다. 본 논문에서는 경량 인공지능 하드웨어의 효율적인 제어 및 최적화를위한 통합 프레임워크를 제안한다. 제안된 통합 프레임워크는 데이터 전처리 및 뉴로모픽 기반 경량 인공지능엔진을 유연하게 재구성할 수 있으며, 최적의 모델을 생성할 수 있다. 기능검증을 위해 손글씨 이미지 데이터세트와 관성 센서 데이터 기반의 낙상 검출 데이터 세트를 사용하였으며, 실험 결과 제안하는 통합 프레임워크가 각각의 데이터 세트에서 90% 이상의 정확도를 갖는 최적의 모델을 생성함을 확인하였다. A lightweight artificial intelligence hardware has made great strides in many application areas. In general, a lightweight artificial intelligence system consist of lightweight artificial intelligence engine and preprocessor including feature selection, generation, extraction, and normalization. In order to achieve optimal performance in broad range of applications, lightweight artificial intelligence system needs to choose a good preprocessing function and set their respective hyper-parameters. This paper proposes a unified framework for a lightweight artificial intelligence system and utilization method for finding models with optimal performance to use on a given dataset. The proposed unified framework can easily generate a model combined with preprocessing functions and lightweight artificial intelligence engine. In performance evaluation using handwritten image dataset and fall detection dataset measured with inertial sensor, the proposed unified framework showed building optimal artificial intelligence models with over 90% test accuracy.
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정종화(Chung Chong Hwa),신석우(Shin Suk Woo),이재학(Lee Jae Hack) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.4
N/A Primary cancer of the Gallbladder is not uncommon. The prognosis is poor because (1) preoperative diagnosis is difficult, (2) the tumor usually invades the ]iver and adjacent structures by the time of operation and (3) the responses to chemo and/or radiotherapy are poor. A clinical review was carried out in 23 cases of primary Gallbladder cancer patients received the operation at the Department of Surgery, St. Mary's Hospital, Catholic University Medical College between Feb. 1976 and Apr. 1988. The results were as follows. 1) The range of age was 24 to 60 years old, and the peak incidence was in 41 to 60 years old age group with its number of 19 (83%). 2) The ratio of male to female was about 1:2. 3) The clinical symptoms in order of frequency were as follows; epigastric and right upper quadrant pain (82%), indigestion (39%.), nausea and vomiting (39%), jaundice (26%), weight loss (22%). 4) The duration of the symptoms was mostly within 3 months (78%). 5) In preoperative diagnosis, the primary cancer of the Gallbladder was only 9 cases (39%). 6) Surgical procedures were performed as follows; Radical procedures (8 cases, 35%), Palliative procedures (11 cases, 43%) and Laparotomy with biopsy (4 cases, 17%). 7) The tumor was limited to the Gallbladder in 3 cases (13%). Extra-GB invasions were liver (11 cases, 48%), CBD (8 cases, 35%), adjacent lymph nodes, duodenum and peritoneum (each 4 cases, 17%). 8) Gallstones were present in 8 cases (35%.). 9) Adenocarcinoma was the most frequently encountered type (16 cases, 74%), and squamous cell carcinoma (5 cases, 22%), undifferent carcinoma (2 cases, 19%).
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이재학,배학근,윤석만,도재원,이경석,윤일규,최순관,변박장 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.1
Risk Factors for Posttraumatic Seizure The authors evaluate the risk factors for posttraumatic seizures. this prospective study was performed in a series of 470 head injured patient from January 1996 to Decomber 1998. The patients who were dead within 1 week of injury or children from 3 years old and under were excluded. There were 358 male and 112 female with a mean age of 35.2±22.8 years (range, 4-88 years). The results were as follows : 1). Of the 470 patients, pasttraumatic seizure occurred in 48 patients(10.2%): early seizure in 28(6%) and late seizure in 20 patients(4.2%). 2). The clinical risk factors for posttraumatic seizure were poor consciousness at admission, presence of brainstem herniation signs, poor GCS score, and posttraumatic amnesia more than 24 hours after trauma(p<0.001). 3). The radiological risk factors for posttraumatic seizure were subdural hematoma(p<0.001), intracerebral hematoma (p<0.02), mutiple intracranial CT lesions(p<0.001), or delayed lesions on follow-up CT scans(p<0.001). the incidence of seizure increased according to the severity of diffuse brain lesion(p<0.001), and the seizure rate in mass lesion was higher than that in diffuse lesion(p<0.001). 5). Hypoxia and coagulopathy had a statistically significant influence on posttraumatic seizure(p<0.05). Hypoxia had a infuence on occurrence of late seizure(p<0.05). 6). The incidence of posttraumatic seizure signiticantly increased in surgical group compared with coservative group(p<0.001) and significantly increased in patient who underwent decompressive craniectomy compared with those who underwent craniotomy(p<0.001) 7). Preventive administration of antiepileptic drugs decreased the incidence of early seizure, but did not affect on the reduction of late seizure. 8). Multivariate logistic regression analysis showed the subdural hematoma, GCS score, delayed lesion, and intracerebral hematoma in order of importance for seizure risk. in conclusion, the risk factors affecting on the occurrence of seizure were clinical status at admission, CT lesions, and severity of diffuse brain inJury. Considering that hypoxia affected on the late seizure, it is necessary to detect and treat it immediately after trauma. In addition, the patients who underwent decompressive craniectomy should be carefully followed to evaluate the risk of late seizure. Even though preventive administration of antiepileptic drugs had a tendency to decrease the incidence of early seizure, it is unclear whether administration of antiepileptic drugs can reduce the incidence of posttraumatic seizures. Prospective study will be needed in the selected patients.
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