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박희준(Hee Joon Park),허재혁(Jaehyeok Heo),윤린(Rin Yun) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
안정적인 도심형 신재생에너지 열공급의 확대 보급을 위해 신재생 복합열원을 이용한 최적 열공급 설계기술 개발이 필요하다. 본 연구에서는 태양열 집열기, 축열조 2대, 연료전지, 지열원히트펌프, BTES 시스템을 연동하여 3개의 빌딩에 난방열을 공급하는 시스템을 TRNSYS를 사용하여 모델링하였고, 축열조 온도를 기준으로 축열조 간 열거래를 시행하면서 지역난방에서 공급되는 에너지와 시스템 내에서 소비되는 에너지의 합을 최소화하는 방향으로 다양한 운전변수를 바꾸어가며 에너지변화량을 고찰하였다. 열거래를 실시하면 그렇지 않은 경우보다 에너지 소비가 적었고, 특정 온도가 낮을 때에만 열교환을 하거나 열거래 절대량이 많다고 해서 반드시 좋다고 볼 수 없다는 사실을 알 수 있었다.
박희준(Hee Joon Park),허재혁(Jaehyeok Heo),윤린(Rin Yun) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
안정적인 도심형 신재생에너지 열공급의 확대 보급을 위해 신재생 복합열원을 이용한 최적 열공급 설계기술 개발이 필요하다. 본 연구에서는 태양열 집열기, 축열조 2대, 연료전지, 지열원히트펌프, BTES 시스템을 연동하여 3개의 빌딩에 난방열을 공급하는 시스템을 TRNSYS를 사용하여 모델링하였고, 축열조 온도를 기준으로 축열조 간 열거래를 시행하면서 지역난방에서 공급되는 에너지와 시스템 내에서 소비되는 에너지의 합을 최소화하는 방향으로 다양한 운전변수를 바꾸어가며 에너지변화량을 고찰하였다. 열거래를 실시하면 그렇지 않은 경우보다 에너지 소비가 적었고, 특정 온도가 낮을 때에만 열교환을 하거나 열거래 절대량이 많다고 해서 반드시 좋다고 볼 수 없다는 사실을 알 수 있었다.
요추 불안정 환자에서 단순방사선 소견과 자기공명영상 소견의 비교
이인희,박희준,진종식,이정현,김윤년,Lee, In-Hee,Park, Hee-Joon,Jin, Jong-Sik,Lee, Jyung-Hyun,Kim, Yoon-Nyun 대한물리치료학회 2007 대한물리치료학회지 Vol.19 No.3
Purpose: This study was to investigate how dose the radiography findings are to magnetic resonance (MR) image findings in the L5-S1 instability patients. The subjects of this study were comprised of eleven males and fifteen females, who had Lumbago and agreed with this research. Methods: Radiography and MR images of Lumbar spine were acquired respectively from subjects in conditions of maximum flexion and extension. The horizontal and angular displacements in lumabosacral spine radiography were used to assess the instability of lumbar spine. MR images were also used to evaluate the intervertebral disc abnormalities and change of bone marrow. Results: The results are as follows. 1. In the case of flexion transitional displacement proposed by Dupuis et al, the specificity and negative predictive value were good accuracy ($0.7{\sim}0.8$), and the negative predictive value was in average. In the case of extension displacement, the negative predictive value was about average ($0.6{\sim}0.7$), but the sensitivity, specificity and positive predictive value were below the poor (<0.6). On the other side, the specificity was about average but other things were below in the case of angular displacement. 2. In the case of flexion transitional displacement proposed by Dupuis et al., compared with the intervertebral disc abnormalities, the negative prediction value was excellent, the sensitivity good, and the specificity about average. In the case of extension, the negative prediction value was about average, but the other things were poor. On the other side the specificity and negative predictive value had good accuracy and the sensitivity and positive prediction value were below average in the case of angular displacement. Conclusion: The above results show that the radiography finding is sufficiently helpful to find the lumbar spine instability as an economic point of view.
캡슐형 무선 내시경의 양방향 통신을 위한 CPLD 기반의 제어기 설계 및 구현
이정현,문연관,박희준,원철호,이승하,최현철,조진호,Lee Jyung Hyun,Moon Yeon Kwan,Park Hee Joon,Won Chul Ho,Lee Seung Ha,Choi Hyun Chul,Cho Jin Ho 대한의용생체공학회 2004 의공학회지 Vol.25 No.6
사람의 장속에서 영상을 획득하여 이를 체외로 전송하는 무선 내시경과 같은 초소형 텔레메트리 캡슐에서는 캡슐의 크기와 전원 공급에 많은 제약을 받는다. 캡슐을 삼킬 수 있는 크기로 제작하기 위해서는 소형의 건전지를 사용하여 캡슐이 소화관 내를 조사하는 동안 안정적인 전원 공급이 이루어지도록 해야 한다. 이를 위해서는 양방향 통신을 이용한 캡슐의 동작 및 전원 제어가 필수적이다. 본 연구에서는 캡슐형 내시경에서의 양방향 통신을 위한 CPLD (complex programmable logic device) 기반의 제어기를 설계 및 구현하였다. 캡슐 제어기는 체외의 제어기로부터 제어 명령을 전달받아 이를 수행하며 제어 동작의 수행 결과로 장내부의 영상을 획득하여 체외로 전송한다. 설계한 제어기를 컴퓨터 모의실험을 통해 설계사양을 검증하고 이를 CPLD로 구현하였다. 구현한 제어기를 캡슐형 무선 내시경에 탑재하여 동물실험을 수행하였으며 동물 실험 결과 실험 대상 동물의 체내에서 캡슐의 동작과 전원을 제어 할수 있었으며 동작제어의 결과로 장내부의 영상을 획득하여 이를 복원 할 수 있었다. In the case of a capsule that can acquire and transmit images from the intestines, the size of the module and the battery capacity in the capsule are subject to restriction. The capsule must be swallowable and the battery must maintain the stable power during the capsule travels in the gastrointestinal tract. Therefore, it is important to control the endoscope using bi-directional wireless communication. In this study, encoder and decoder CPLD modules for bi-directional capsule endoscopes were designed and implemented. The designed controller for capsule endoscope can transmit the images of GI-track from inside to outside of the body and the capsules can be controlled by external controller simultaneously. The designed and implemented controller was verified by an in-vivo animal experiments. From these experiments, it was verified that the CPLD module for bi-directional capsule endoscope satisfied the design specifications.
호흡곤란환자의 입-퇴원 분석을 위한 규칙가중치 기반 퍼지 분류모델
손창식,신아미,이영동,박형섭,박희준,김윤년,Son, Chang-Sik,Shin, A-Mi,Lee, Young-Dong,Park, Hyoung-Seob,Park, Hee-Joon,Kim, Yoon-Nyun 대한의용생체공학회 2010 의공학회지 Vol.31 No.1
A rule weight -based fuzzy classification model is proposed to analyze the patterns of admission-discharge of patients as a previous research for differential diagnosis of dyspnea. The proposed model is automatically generated from a labeled data set, supervised learning strategy, using three procedure methodology: i) select fuzzy partition regions from spatial distribution of data; ii) generate fuzzy membership functions from the selected partition regions; and iii) extract a set of candidate rules and resolve a conflict problem among the candidate rules. The effectiveness of the proposed fuzzy classification model was demonstrated by comparing the experimental results for the dyspnea patients' data set with 11 features selected from 55 features by clinicians with those obtained using the conventional classification methods, such as standard fuzzy classifier without rule weights, C4.5, QDA, kNN, and SVMs.
일부 물리치료사와 작업치료사의 환자 의료정보보호 행동 이해
이인희,신아미,손창식,박상영,박희준,윤경일,김윤년,Lee, In-Hee,Shin, A-Mi,Son, Chang-Sik,Park, Sang-Young,Park, Hee-Joon,Yoon, Kyung-Il,Kim, Yoon-Nyun 대한물리치료학회 2010 대한물리치료학회지 Vol.22 No.2
Purpose: The purpose of this study was to use the theory of planned behavior, past habit and moral obligation to better understand the behavior of physical therapists (PTs) and occupational therapists (OTs) in protecting the medical information of patients. Methods: We conducted a survey using self-writting questionnaires structured within the framework of the theory of planned behavior to understand to analyze information from 103 clinical PTs and OTs in their efforts to protect patient medical information. Results: The PTs and OTs' medical information protecting behavior was 2.85 mean points. That point failed to reach 1.0 points. Behavior intention was 3.83 mean points. That was judged to be improved. Behavioral intention was closely correlated with behavior, behavioral attitude, subjective norms, behavior control, and past habit. Variables related to the theory of planned behavior, attitude, subjective norms, and perceived behavior control all explained 50% of the behavioral intention of PTs and OTs regarding future divulgence of patient information. The past habits of PTs and OTs were also a significant predictor in explaining the behavioral intention to protect a patient's medical information (p<0.01). Conclusion: Revising the behavioral attitudes, subjective norms, perceived behavior control, and past habits of PTs and OTs helped improve their behavior regarding protection of the medical information of patents.
데이터 마이닝을 활용한 뇌경색증과 동반되는 질환의 연관성 분석
이인희,신아미,손창식,박희준,김중휘,박상영,최진호,김윤년,Lee, In-Hee,Shin, A-Mi,Son, Chang-Sik,Park, Hee-Joon,Kim, Joong-Hwi,Park, Sang-Young,Choi, Jin-Ho,Kim, Yoon-Nyun 대한물리치료학회 2010 대한물리치료학회지 Vol.22 No.1
Purpose: The purpose of this study was to apply association rule mining to explore the labyrinthine network of cerebral infarction comorbidity and basic data supply to develop cutting-edge physical therapy protocols for cerebral infarction with comorbidity Methods: From clinic records of enrollees of A Hospital in D city, patients over 18 years of age with cerebral infarction and cerebral infarction comorbidity were recruited as a case group. All diagnoses of that hospital were categorized according to the "International Classification of Disease (ICD)" diagnosis system. We extracted code I63 from the "Korea Classification of Disease (KCD)-4". Associated rule mining was done with a priori modeling and Web nodes to examine the strengths of associations among those diagnoses. The support and confidence values of associated rule mining results were examined. Results: The subjects of this study were 2,267 cerebral infarction patients. E11 (Non-insulin-dependent diabetes mellitus), E78 (Disorders of lipoprotein metabolism and other lipidaemias), G81 (Hemiplegia), I10 (Essential hypertension), and K29 (Gastritis and duodenitis) were high frequency diagnoses, being found in 10% or more of total diagnoses of cerebral infarction from frequency analysis results. The highest frequency diagnosis was 1,042 (46.0%) for I10. The second most frequent diagnosis was for E11(21.5%) while the third most frequent diagnosis was E78 (20.2%). Results from a priori modeling and Web nodes indicated that cerebral infarction has a strong association withessential hypertension, non-insulin-dependent diabetes mellitus, disorders of lipoprotein metabolism and other lipidaemias. Conclusion: Cerebral infarction is associated with hypertension, diabetes mellitus, and disorders of lipoprotein metabolism and other lipidaemias. The result of this study will be helpful to clinicians treating patients with cerebral infarction.