• 한국정보전자통신기술학회논문지
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• 제12권5호
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• pp.521-528
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• 2019

Epilepsy is one of the most prevalent neurological diseases. Electroencephalogram (EEG) signals are widely used for monitoring and diagnosis tool for epileptic seizure. Typically, a huge amount of EEG signals is needed, where they are visually examined by experienced clinicians. In this study, we propose a simple automatic seizure detection framework using intracranial EEG signals. We suggest a sparse approximation based classification (SAC) scheme by solving overdetermined system. L1-norm minimization algorithms are utilized for efficient sparse signal recovery. For evaluation of the proposed scheme, the public EEG dataset obtained by five healthy subjects and five epileptic patients is utilized. The results show that the proposed fast L1-norm minimization based SAC methods achieve the 99.5% classification accuracy which is 1% improved result than the conventional L2 norm based method with negligibly increased execution time (42msec).

• 한국직업건강간호학회지
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• 제28권2호
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• pp.75-82
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• 2019

Purpose: This study aimed to determine the influence of injury and/or injured area classification on depression in patients with industrial injuries. Methods: The participants comprised438 patients who consented to participate and completed self-reported questionnaires. Data were analyzed using SPSS/WIN version 22.0 for descriptive statistics, $x^2$ test, fisher's exact test, ANOVA, and post-hoc $Scheff{\acute{e}}$ test. A stepwise multiple regression analysis was used to identify factors influencing depression. Results: The results indicated that the effect of disease classification and injured areas on depression were significantly different in patients with industrial injuries. The results further showed that severe depression was significantly higher in cardiovascular patients and patients with an injured area of the head and waist. The most powerful predictor was age (50~59 years), return to work (reemployment), disease classification (cardiovascular), and injured area (head, including vascular disease). Conclusion: This study showed that the most influential variable of depression in patients with industrial injuries were cardiovascular issues, injury areas of the head and waist, being aged 50~59 years, and reemployment. To reduce depression in these patients, it is important to develop and implement a psychiatric rehabilitation program that helps patients to formulate a concrete plan and goal for recovery, enabling patients to actively engage in their rehabilitation.

• 환경위생공학
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• 제12권3호
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• pp.81-86
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• 1997

In case of Industrial Wastewater, It was various pollutions, high concentration and different physical, chemical properties each other in accordance with classification of wastewater. Therefore, after inquiring into the influence on the membrane of the dissolved pollutants, we should select the membrane of best efficient quality. As results of experiments on pilot plant test, optimum operating pressure for fouling removal was 34BAR, when continues operating was 34 BAR, recovery rate was 75% and permeate water flux was $32.9{\;}{\ell}/hr{\cdot}m^{2}$.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2003년도 춘계학술대회
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• pp.230-237
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• 2003

본 논문에서는 정보시스템 재해복구 센터의 설계 시 사용될 수 있는 센터 유형 분석 모형을 제시한다. 국내 구축사례와 기존 문헌을 중심으로 재해복구센터 아키텍처 설계를 위한 중요한 기준을 결정하는 3차원모형을 제안한다. 주요 변수로서는 복제솔루션, 복구신뢰수준, 및 아웃소싱 수준을 선정하였다. 제안된 변수 각각의 기준에 대한 제안 배경에 대해 논의하고 주요 특성에 관하여 설명하였다.

• 자원리싸이클링
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• 제12권3호
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• pp.3-12
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• 2003

폐 탄탈륨 콘덴서에 함유된 탄탈륨 anode를 물리적인 방법으로 회수하고자 파쇄, 입도분리, 건식 자력선별 그리고 공기 분급 실험을 수행하였다. 단체분리를 위해 롤 크럿셔를 사용하여 폐회로 공정에서 8mesh 이하로 파쇄하면. 대부분의 탄탈륨 anode는 레진과의 단체분리는 이루어지나 일부 금속과의 단체분리가 되지 않은 상태로 남게된다. 파쇄된 시료를 8/10 mesh, 10/18 mesh, -18 mesh 로 분립한 결과, 금속물질은 8/10 mesh 입자에, 탄탈륨 anode는 +18 mesh에 주로 분포하며, -l8 mesh에는 레진의 함량이 71.5％로 레진이 탄탈륨 anode나 금속물질보다 미립화가 쉽게 이루어짐을 알 수 있었다. 자력선별에 의한 금속 물질의 분리효율은 원료의 입도에 따라 크게 차이가 있으나, 일부 금속물질이 약자성체이거나 탄탈륨anode와 단체분리가 이루어지지 않아 금속물질 제거율은 62.3%로 비교적 저조하였다. 탄탈륨 anode와 레진의 분리를 위한 입도별 공기 분급실험 결과, 각 입도별 최적 공기량은 각각 39㎥/h, 32㎥/h, 20㎥/h로 나타났다. 최적의 조건으로 회수한 탄탈륨 anode 생산율은 49.39wt.％, 각 성분의 함량은 97.47wt.% 탄탈륨 anode, 0.93wt.％ 레진. 1.51 wt.％ 금속으로 탄탈륨 anode 실수율은 94.45％이었다.

• Urogenital Tract Infection
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• 제13권3호
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• pp.79-83
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• 2018

Purpose: The 5 alpha reductase inhibitor (5ARI) reduces the size of the prostate and alleviates lower urinary tract symptoms. After stopping 5ARI, the prostate quickly recovers to its pre-medication size. The purpose of this study was to investigate the factors affecting the restoration of prostate size after 5ARI discontinuation. Materials and Methods: Between March 2009 and May 2017, patients who visited an outpatient clinic and were diagnosed with benign prostatic hyperplasia were selected and start 5ARI medication. After 6 months of medication, the patients stopped medication for 1 year. Meanwhile, we measured the prostate volumes of patients 3 times (before and after medication, after discontinuation) and divide the patients into 3 groups (maintained, intermediate, and restored) with recovered prostate volume ratio. After classification, we investigated the relationship between the variable factors (age, serum prostate-specific antigen, initial volume, reduced volume after medication) between groups. Results: Among the 147 selected patients, the mean age and plasma PSA level were $61.6{\pm}7.9$ and $0.8{\pm}0.6$, respectively. The mean initial prostate volume was $32.3{\pm}4.2ml$, which reduced to $23.2{\pm}3.2ml$ after medication. After one year of discontinuation, the mean volume was $31.4{\pm}6.4ml$, with restoration to 101.5% of the reduced size. We noticed a tendency that patients with faster prostate volume recovery were generally older than those with slower recovery; however, this was not statistically significant. Other factors showed no relationship with prostate recovery. Conclusions: When using 5ARI in elderly patients, continuous treatment seems better than intermittent treatment. If discontinuation is needed, short term follow-up is recommended.

• 대한두개안면성형외과학회지
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• 제23권6호
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• pp.262-268
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• 2022

Background: To compare the sensory change and recovery of infraorbital area associated with zygomaticomaxillary and orbital floor fractures and their recoveries and investigate the factors that affect them. Methods: We retrospectively reviewed 652 patients diagnosed with zygomaticomaxillary (n= 430) or orbital floor (n= 222) fractures in a single center between January 2016 and January 2021. Patient data, including age, sex, medical history, injury mechanism, Knight and North classification (in zygomaticomaxillary fracture cases), injury indication for surgery (in orbital floor cases), combined injury, sensory change, and recovery period, were reviewed. The chi-square test was used for statistical analysis. Results: Orbital floor fractures occurred more frequently in younger patients than zygomaticomaxillary fractures (p< 0.001). High-energy injuries were more likely to be associated with zygomaticomaxillary fractures (p< 0.001), whereas low-energy injuries were more likely to be associated with orbital floor fractures (p< 0.001). The sensory changes associated with orbital floor and zygomaticomaxillary fractures were not significantly different (p= 0.773). Sensory recovery was more rapid and better after orbital floor than after zygomaticomaxillary fractures; however, the difference was not significantly different. Additionally, the low-energy group showed a higher incidence of sensory changes than the high-energy group, but the difference was not statistically significant (p= 0.512). Permanent sensory changes were more frequent in the high-energy group, the difference was statistically significant (p= 0.043). Conclusion: The study found no significant difference in the incidence of sensory changes associated with orbital floor and zygomaticomaxillary fractures. In case of orbital floor fractures and high-energy injuries, the risk of permanent sensory impairment should be considered.

• Neurospine
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• 제15권4호
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• pp.368-375
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• 2018

Objective: To evaluate the results of operative management of subaxial spine injuries managed with 2-level anterior cervical corpectomy and fusion with a cervical locking plate and autologous bone-filled titanium mesh cage. Methods: This study included 23 patients with a subaxial spine injury who matched the inclusion criteria, underwent 2-level anterior cervical corpectomy and fusion at our institution between 2013 and 2016, and were followed up for neurological recovery, axial pain, fusion, pseudarthrosis, and implant failure. Results: According to Allen and Ferguson classification, there were 9 cases of distractive extension; 4 of compressive extension; 3 each of compressive flexion, vertical compression, and distractive flexion; and 1 of lateral flexion. Sixteen patients had a score of 6 on the Subaxial Injury Classification system, and the rest had a score of more than 6. The mean follow-up period was 19 months (range, 12-48 months). Neurological recovery was observed in most of the patients (78.21%). All patients experienced relief of axial pain. None of the patients received a blood transfusion. Twenty-one patients (91.3%) showed solid fusion and 2 (8.69%) showed possible pseudarthrosis, with no complications related to the cage or plate. Conclusion: Two-level anterior cervical corpectomy and fusion, along with stabilization with a cervical locking plate and autologous bone graft-filled titanium mesh cage, can be considered a feasible and safe method for treating specific subaxial spine injuries, with the benefits of high primary stability, anatomical reduction, and direct decompression of the spinal cord.

• Clinics in Shoulder and Elbow
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• 제26권1호
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• pp.25-31
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• 2023

Background: This study analyzed questions searched by rotator cuff patients and determined types and quality of websites providing information. Methods: Three strings related to rotator cuff repair were explored by Google Search. Result pages were collected under the "People also ask" function for frequent questions and associated webpages. Questions were categorized using Rothwell classification and topical subcategorization. Webpages were evaluated by Journal of the American Medical Association (JAMA) benchmark criteria for source quality. Results: One hundred twenty "People also ask" questions were collected with associated webpages. Using the Rothwell classification of questions, queries were organized into fact (41.7%), value (31.7%), and policy (26.7%). The most common webpage categories were academic (28.3%) and medical practice (27.5%). The most common question subcategories were timeline of recovery (21.7%), indications/management (21.7%), and pain (18.3%). Average JAMA score for all 120 webpages was 1.50. Journal articles had the highest average JAMA score (3.77), while commercial websites had the lowest JAMA score (0.91). The most commonly suggested question for rotator cuff repair/surgery was, "Is rotator cuff surgery worth having?," while the most commonly suggested question for rotator cuff repair pain was, "What happens if a rotator cuff is not repaired?" Conclusions: The most commonly asked questions pertaining to rotator cuff repair evaluate management options and relate to timeline of recovery and pain management. Most information is provided by medical practice, academic, and medical information websites, which have highly variable reliability. By understanding questions their patients search online, surgeons can tailor preoperative education to patient concerns and improve postoperative outcomes.

• 유기물자원화
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• 제28권3호
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• pp.15-26
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• 2020

하수슬러지 소각재에서 인(P)을 회수하기 위해 소각재를 황산 용액으로 추출한 후, 알칼리 물질로 pH를 높이면서 회수되는 인(P)과 불순물인 중금속 함량을 비교하여 최적의 인(P) 회수 조건을 실험하였으며, 이때 산추출액을 재사용하거나, 소각재를 입자크기 별로 구분하였을 때 인(P) 회수효율을 비교하였다. 하수슬러지 소각재로부터 인(P)을 회수하기 위한 조건은 1N 황산 용액으로 L/S비 10, 추출시간 30분으로 하는 것이 최적이었다. 인(P)을 회수하기 위한 적정 pH는 알칼리 물질 첨가량, 회수되는 침전물 내의 중금속 함량 등을 고려하였을 때 pH 5 이전에 생성되는 침전물에서 인(P)을 회수하는 것이 유리한 것으로 판단된다. 소각재 추출액의 재사용율(100, 50%)에 따라 인(P)의 회수율을 각각 14, 21% 증가시켰으나, Zn 함량이 각각 33, 21%, Cu의 함량이 각각 35, 20% 증가되었다. 하수슬러지 소각재를 입자크기별로 4개 구간으로 나누어 실험한 결과 특정 크기 구간의 소각재 만을 인(P) 추출하는데 따른 장점은 없었다. EDTA와 양이온 교환수지 등을 통한 추출액 중의 중금속 제거 효과는 크지 않았다.