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Sunjin Ryu,Bo-Kyeong Kang,Mimi Kim,Chul-Min Lee 대한영상의학회 2024 대한영상의학회지 Vol.85 No.3
직장 매독은 매독 감염(syphilis infection)에서 드물게 발생하며 증상 및 내시경, 영상 소견이 비특이적이다. 직장 매독은 일반적으로 동심성 장벽비후, 점막 충혈, 직장간막 지방침윤, 림프절병증 등으로 나타난다. 직장암은 비대칭적 장벽비후, 림프절 괴사를 보여 두 질환 감별에 도움을 얻을 수 있다. 하지만 두 질환의 중복되는 소견이 많아 환자의 병력을 고려하지않고 직장 매독과 직장암을 구분하기는 매우 어렵다. 직장 매독은 직장암 외에도 염증성 장질환 등 다른 양성 질환으로 오인하여 필요 없는 검사를 하거나 치료가 지연되는 경우가 많다. 저자들은 악성 종양으로 의심되었던 직장 매독 증례를 경험하여 이 증례 보고에서 내시경 및 영상, 병리학적 소견에 대하여 자세히 보고하고자 한다. Rectal syphilis is a rare form of syphilis presentation and its symptoms, endoscopic and radiologic findings are nonspecific. Rectal syphilis typically presents with features such as concentric rectal wall thickening, mucosal hyperemia, perirectal fat stranding, and lymphadenopathy. Rectal cancer exhibits asymmetric wall thickening and lymph node necrosis, aiding in the differentiation between these two diseases. However, due to the considerable overlap in their respective manifestations, distinguishing between rectal syphilis and rectal cancer is extremely challenging without considering the patient’s medical history. Rectal syphilis often leads to unnecessary tests or delayed treatment, as it can be mistaken for other benign diseases such as inflammatory bowel diseases in addition to rectal cancer. In this case report, we aim to provide a detailed report on the endoscopic, imaging, and pathological findings based on our experience with a case of suspected rectal malignancy that turned out to be rectal syphilis.
Retroperitoneal Ectopic Pregnancy Detected by CT: A Case Report
Sunjin Ryu,Chul-min Lee,Bo-Kyeong Kang,Mimi Kim 대한영상의학회 2024 대한영상의학회지 Vol.85 No.1
Retroperitoneal ectopic pregnancy is a rare form of ectopic pregnancy. Owing to its rarity and nonspecific symptoms, diagnosing retroperitoneal ectopic pregnancy at the initial presentation poses a significant challenge. Typically, the diagnosis relies on non-radiation imaging modalities, such as ultrasonography and MRI, whereas CT is infrequently used. Herein, we report a rare case of a retroperitoneal ectopic pregnancy, which was diagnosed using CT.
목 건강 고위험군의 움직이는 모니터 사용에 따른 두부전방 자세 교정 효과에 관한 연구
최경희(Kyeong-Hee Choi),공용구(Yong-Ku Kong),심현호(Hyun-Ho Shim ),조민욱(Min-Uk Cho),박채원(Chae-Won Park),홍보람(Bo-Ram Hong),김승훈(Seoung-Hoon Kim),정현주(Hyun-Ju Jung),송현아(Hyun-A Song),류지헌(Ji-Heon Ryu),김재경(Jae-Kyeong Ki 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10
Objective: The aim of this study was to verify the correction effect of Forward Head Posture (FHP) by using Moving Monitor in a high-risk group of the neck. Background: Office workers who have been used VDTs are subject to high loads on the neck and shoulders during their work due to the high frequency of FHP. Thus, our research team developed a Moving Monitor Arm that continuously induced calibration movements when the users use the monitor. Method: Seven participants who rated as a high-risk group of the neck to study the effect of FHP correction using the Moving Monitor. The fatigue and posture of the neck were quantified using Flexion Relaxation Ratio (FRR), Onset Angle, Offset Angle, Craniovertbral Angle (CVA) and Subjective Discomfort Rating in this study. Results: The effects of task pre/post on the FRR and subjective discomfort, and the effect of monitor type on the Onset/Offset angles was significant in this study, respectively. Conclusion: Based on the results of the experiment, correction effect of Moving Monitor was verified. Application: The results of this study showed that moving monitors can be applied to prevent musculoskeletal disorders associated with VDTs.
Choi Bo Hwa,Baek Hye Jin,Ha Ji Young,Ryu Kyeong Hwa,Moon Jin Il,Park Sung Eun,Bae Kyungsoo,Jeon Kyung Nyeo,Jung Eun Jung 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.9
Objective: To investigate the clinical feasibility of synthetic diffusion-weighted imaging (sDWI) at different b-values in patients with breast cancer by assessing the diagnostic image quality and the quantitative measurements compared with conventional diffusion-weighted imaging (cDWI). Materials and Methods: Fifty patients with breast cancer were assessed using cDWI at b-values of 800 and 1500 s/mm2 (cDWI800 and cDWI1500) and sDWI at b-values of 1000 and 1500 s/mm2 (sDWI1000 and sDWI1500). Qualitative analysis (normal glandular tissue suppression, overall image quality, and lesion conspicuity) was performed using a 4-point Likert-scale for all DWI sets and the cancer detection rate (CDR) was calculated. We also evaluated cancer-to-parenchyma contrast ratios for each DWI set in 45 patients with the lesion identified on any of the DWI sets. Statistical comparisons were performed using Friedman test, one-way analysis of variance, and Cochran’s Q test. Results: All parameters of qualitative analysis, cancer-to-parenchyma contrast ratios, and CDR increased with increasing b-values, regardless of the type of imaging (synthetic or conventional) (p < 0.001). Additionally, sDWI1500 provided better lesion conspicuity than cDWI1500 (3.52 ± 0.92 vs. 3.39 ± 0.90, p < 0.05). Although cDWI1500 showed better normal glandular tissue suppression and overall image quality than sDWI1500 (3.66 ± 0.78 and 3.73 ± 0.62 vs. 3.32 ± 0.90 and 3.35 ± 0.81, respectively; p < 0.05), there was no significant difference in their CDR (90.0%). Cancer-to-parenchyma contrast ratios were greater in sDWI1500 than in cDWI1500 (0.63 ± 0.17 vs. 0.55 ± 0.18, p < 0.001). Conclusion: sDWI1500 can be feasible for evaluating breast cancers in clinical practice. It provides higher tumor conspicuity, better cancer-to-parenchyma contrast ratio, and comparable CDR when compared with cDWI1500.
류준모(Joon Mo, Ryu),박승보(Seung-Bo, Park),김재경(Jae Kyeong, Kim) 한국지능정보시스템학회 2013 지능정보연구 Vol.19 No.1
Recently, the high value added business is steadily growing in the culture and art area. To generated high value from a performance, the satisfaction of audience is necessary. The flow in a critical factor for satisfaction, and it should be induced from audience and measures. To evaluate interest and emotion of audience on contents, producers or investors need a kind of index for the measurement of the flow. But it is neither easy to define the flow quantitatively, nor to collect audience’s reaction immediately. The previous studies of the group flow were evaluated by the sum of the average value of each person’s reaction. The flow or “good feeling” from each audience was extracted from his face, especially, the change of his (or her) expression and body movement. But it was not easy to handle the large amount of real-time data from each sensor signals. And also it was difficult to set experimental devices, in terms of economic and environmental problems. Because, all participants should have their own personal sensor to check their physical signal. Also each camera should be located in front of their head to catch their looks. Therefore we need more simple system to analyze group flow. This study provides the method for measurement of audiences flow with group synchronization at same time and place. To measure the synchronization, we made real-time processing system using the Differential Image and Group Emotion Analysis (GEA) system. Differential Image was obtained from camera and by the previous frame was subtracted from present frame. So the movement variation on audience’s reaction was obtained. And then we developed a program, GEX(Group Emotion Analysis), for flow judgment model. After the measurement of the audience’s reaction, the synchronization is divided as Dynamic State Synchronization and Static State Synchronization. The Dynamic State Synchronization accompanies audience’s active reaction, while the Static State Synchronization means to movement of audience. The Dynamic State Synchronization can be caused by the audience’s surprise action such as scary, creepy or reversal scene. And the Static State Synchronization was triggered by impressed or sad scene. Therefore we showed them several short movies containing various scenes mentioned previously. And these kind of scenes made them sad, clap, and creepy, etc. To check the movement of audience, we defined the critical point, αand β. Dynamic State Synchronization was meaningful when the movement value was over critical point β, while Static State Synchronization was effective under critical point α. β is made by audience’clapping movement of 10 teams in stead of using average number of movement. After checking the reactive movement of audience, the percentage(%) ratio was calculated from the division of “people having reaction” by “total people”. Total 37 teams were made in “2012 Seoul DMC Culture Open” and they involved the experiments. First, they followed induction to clap by staff. Second, basic scene for neutralize emotion of audience. Third, flow scene was displayed to audience. Forth, the reversal scene was introduced. And then 24 teams of them were provided with amuse and creepy scenes. And the other 10 teams were exposed with the sad scene. There were clapping and laughing action of audience on the amuse scene with shaking their head or hid with closing eyes. And also the sad or touching scene made them silent. If the results were over about 80%, the group could be judged as the synchronization and the flow were achieved. As a result, the audience showed similar reactions about similar stimulation at same time and place. Once we get an additional normalization and experiment, we can obtain find the flow factor through the synchronization on a much bigger group and this should be useful for planning contents.
유호경(Ho-Kyong Ryu),김경호(Kyeong-Ho Kim),김호기(Ho-Ki Kim),안보순(Bo-Soon Ahn),배형석(Hyung-Suck Bae),김대식(Dai-Seek Kim),김왕주(Wang-Joo Kim),한양주(Yang-Joo Han) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
According to recent urbanization, urban expansion and becoming bigger of equipment, under lower lands of transmission line and the risk of contact with objects have been being increased. Due to increasing of demand for electricity Quality of power users, the users have been increasing complaints and compensation claims which are as a result of a power failure. Every year, the budget of tens of billions which is appropriated for construction of securing separation distance in the previous method of construction, has been collected by reason of failure of spaces security. The reason why developed equipment for raising the iron tower is excessive construction cost of the previous method of construction. This invention is to resolve these issues. Setting up Helper Tower using by exist iron tower can solve problem of installing temporary or newly-set tower. Therefore, this method can be solved problems of compensation costs for spaces security and complaints of power users. And this method can save cost by setting temporary tower with using materials of exist iron tower.