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김한근,사공건 東亞大學校 1993 東亞論叢 Vol.30 No.1
In this paper, the absorption characteristics of Ni-Zn ferrite/rubber composite with some additives were investigted. The Composite specimens were prepared by molding and curing the mixtures of matrix rubber, Ni-Zn ferrite powders which were synthesized by wet-direct method and some kinds of additives. The matching thickness on Ni-Zn ferrite/rubber composite with additives, such as Carbon(C), Cobalt (Co), Copper-Manganese(CU-Mn) and Cobalt-Copper-Manganese(Co-Cu-Mn), utilizing the Smity Chart were 7.0, 7.7, 7.6 and 8.0(mm), respectively. The reflection lossof the specimens which were added with C, Co, Cu-Mn and Co-Cu-Mn were shown 16, 32, 28 and 37[dB] in the frequency range between 2.28 and 2.6(GHz), and the relative reflection band width(B/f) fo ferrite/rubber composites with additives(Co, Cu-Mn, Co-Cu-Mn) were about 38, 35 and 32[%], respectively.
시뮬레이션에 기반한 휴머노이드 로봇 두 대의 안정적인 물체 운반 및 제어 연구
김한근(Han-Guen Kim),김형진(Hyung-Jean Kim),박원만(Won-Man Park),김윤혁(Yoon-Hyuk Kim),김동한(Dong-Han Kim),안진웅(Jin-Ung An) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.2
This paper proposes an intelligent PID/Fuzzy control system for two humanoid robots to transport objects stably. When a robot transports an object while walking, a whole body system of a robot may not be stable due to vibration or external factors from a different departure speed error and a body movement of walking robots. Therefore, it is necessary to measure the horizontal and vertical locations and speeds of object, then calibrate the difference of departure speed between robots with PID/Fuzzy control. The results of simulation with two robots indicated that a proposed controller makes robots to transport an object stably.
Kim, Hee-Jin,Dong, Guen-Han,Kim, Dong-Ho,Jang, Gi-Won,Han, Sung-Hyun The Korean Society of Industry Convergence 2020 한국산업융합학회 논문집 Vol.23 No.2
We describe a new approach to implement of trajectory control and track record of articulated manipulator based on monitoring simulator for smart factory. The learning control algorithm was applied in implementation real-time control to provide enhanced motion control performance for robotic manipulators. The proposed control scheme is simple in structure, fast in computation, and suitable for real-time control. Moreover, this scheme does not require any accurate dynamic modeling, or values of manipulator parameters and payload. Performance of the proposed controller is illustrated by simulation and experimental results for robot manipulator consisting of six joints at the joint space and Cartesian space.by monitoring simulator.
김영수,최원,김영배,김인한,신용운,이돈행,김범수,김형길,권계숙,조현근 대한소화기학회 2000 대한소화기학회지 Vol.35 No.2
Background/Aims: Use of nonsteroidal anti-inflammatory drugs (NSAIDs) is known to be associated with a high incidence of upper gastrointestinal tract bleeding in the elderly. Increase in prevalence of Helicobacter pylori (H. pylori) infection according to age, implicates that an interaction between use of NSAIDs and H. pylori infection may explain the higher incidence of ulcer complications in the elderly. In the present study, we analysed risk factors existed in peptic ulcer patients with upper gastrointestinal bleeding. Methods: A retrospective study was performed for 420 consecutive peptic ulcer patients (bleeding: 98, nonbleeding: 322). The bleeding group had bleeding symptoms and endoscopic stigmata of bleeding. Use of NSAIDs was evaluated by interview and H. pylori infection was confirmed by endoscopic biopsy specimens and CLO test in all cases. Results: The rates of duodenal ulcer were 62.5% in bleeding group and 50.5% in nonbleeding group (p$lt;0.05). NSAIDs and H. pylori-infection didn't show a significant correlation with bleeding (p$gt;0.05). However, CagA showed a positive correlation with the peptic ulcer bleeding, especially gastric ulcer bleeding (p$lt;0.05). Conclusions: In peptic ulcer patients, duodenal ulcer is more prone to bleeding than gastric ulcer. Use of NSAIDs doesn't increase the risk of upper gastrointestinal bleeding. Location of ulcer and CagA positivity seem to be risk factors of upper gastrointestinal bleeding.
Kim, Tae Guen,Han, Yong-Gu,Jeong, Jong Chul,Kim, Youngjin,Kwon, Ohseok,Cho, Youngho The Ecological Society of Korea 2015 Journal of Ecology and Environment Vol.38 No.3
We investigated the current and potential spatial distributions and habitable areas of Biston robustum and Camellia japonica in South Korea in order to provide useful data for the conservation of C. japonica and minimize the damage caused by B. robustum. It was predicted that, by 2070, although B. robustum would be widely distributed throughout the Korean Peninsula, except for the western and eastern coastal areas, it would be narrowly distributed along the Sokcho-si and Goseong-gun coastlines in Gangwon Province. C. japonica is currently located along the southern coastline but its critical habitable area is predicted to gradually disappear by 2070. Assessment of the potential distribution probabilities of B. robustum and C. japonica revealed that the area under the curve (AUC) values were 0.995 and 0.991, respectively, which indicate high precision and applicability of the model. Major factors influencing the potential distribution of B. robustum included precipitation of wettest quarter and annual precipitation (BIO16 and BIO12), whereas annual mean temperature and mean temperature of wettest quarter (BIO1 and BIO8) were important variables for explaining C. japonica distribution. Overlapping areas of B. robustum and C. japonica were $11,782km^2$, $5447km^2$, and $870km^2$ for the current, 2050-predicted, and 2070-predicted conditions, respectively, clearly showing a dramatic decrease in area. Although it is predicted that B. robustum would cause continuous damage to C. japonica in the southern part of the Korean Peninsula, such impacts might diminish over time and become negligible in the future.
Measurement of Therapeutic Proton Beam Using a Fiber-Optic Cerenkov Radiation Sensor
Kim, Seon Guen,Jang, Kyoung Won,Shin, Sang Hun,Hong, Seung Han,Sim, Hyeok In,Jeon, Hye Su,Jang, Jae Seok,Kim, Jae Seok,Kwon, Gu Won,Yoo, Wook Jae,Kim, Me Young,Shin, Dong Ho,Cho, Seung Hyun,Lee, Bong Trans Tech Publications, Ltd. 2014 Advanced materials research Vol.1033 No.-
<P>Tumor therapy using the high-energy radiation has evolved over the decades as typical non-invasive treatment method due to its advantage compared with surgery. But, the radiotherapy can damage or destroy normal cells as well as destroying tumor cells and cause side effects of treatment. Even though most side effects are temporary, these effects can be extremely fatal for patient. Therefore, the exact measurement of the exposure dose of patient during radiation therapy is very important for patient safety. In the case of the conventional fiber-optic radiation sensor that consists of a scintillator for high-energy radiation dosimetry, additional correction is necessary due to the quenching effects of the scintillator. In this study, we measured the exposure dose of the high-energy proton beam without the scintillator by using the Cerenkov radiation that generated inside the plastic optical fiber. As a result of this study, we confirmed a Bragg peak of the proton beam without a scintillator. Also it was in good agreement with the result of the ionization chamber.</P>
Kim Taehee,Choi Hayoung,Kim Sang Hyuk,Yang Bumhee,Han Kyungdo,Jung Jin-Hyung,Kim Bo-Guen,Park Dong Won,Moon Ji Yong,Kim Sang-Heon,Kim Tae-Hyung,Yoon Ho Joo,Shin Dong Wook,Lee Hyun 대한의학회 2024 Journal of Korean medical science Vol.39 No.11
Background: Tuberculosis (TB) survivors have an increased risk of developing chronic obstructive pulmonary disease (COPD). This study assessed the risk of COPD development and COPD-related hospitalization in TB survivors compared to controls. Methods: We conducted a population-based cohort study of TB survivors and 1:1 age- and sex-matched controls using data from the Korean National Health Insurance Service database collected from 2010 to 2017. We compared the risk of COPD development and COPD-related hospitalization between TB survivors and controls. Results: Of the subjects, 9.6% developed COPD, and 2.8% experienced COPD-related hospitalization. TB survivors had significantly higher COPD incidence rates (36.7/1,000 vs. 18.8/1,000 person-years, P < 0.001) and COPD-related hospitalization (10.7/1,000 vs. 4.3/1,000 person-years, P < 0.001) than controls. Multivariable Cox regression analyses revealed higher risks of COPD development (adjusted hazard ratio [aHR], 1.63; 95% confidence interval [CI], 1.54–1.73) and COPD-related hospitalization (aHR, 2.03; 95% CI, 1.81–2.27) in TB survivors. Among those who developed COPD, the hospitalization rate was higher in individuals with post-TB COPD compared to those with non-TB COPD (10.7/1,000 vs. 4.9/1,000 person-years, P < 0.001), showing an increased risk of COPD-related hospitalization (aHR, 1.84; 95% CI, 1.17–2.92). Conclusion: TB survivors had higher risks of incident COPD and COPD-related hospitalization compared to controls. These results suggest that previous TB is an important COPD etiology associated with COPD-related hospitalization.
Simulation Based for Intelligent Control System of Multi – Humanoid Robots for Dynamic Load Carrying
Han-Guen Kim,Jin-Ung An,Jeon-Il Moon,Dong-Han kim 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper proposed method of designing control system for two humanoid robots to transport objects stably in mutual collaboration with the use of PID and Fuzzy control. When a robot transports an object while walking, the transportation of object may not be stable due to vibration or external factors occurred from departure speed error and walking of the robot. Therefore, it is necessary to measure and calibrate the horizontal and vertical locations and speeds of object with PID control with reference to the chest coordinate of robots and then calibrate the difference of departure speed between robots with Fuzzy control. We expect that The results of simulation with two robots indicated that robots can transport objects stably.
( Bo-guen Kim ),( Kyungjong Lee ),( Sang-won Um ),( Jungho Han ),( Jong Ho Cho ),( Jhingook Kim ),( Hojoong Kim ),( Byeong-ho Jeong ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: Primary pulmonary salivary gland-type tumor (PSGT) is a rare malignancy among all lung cancers. Because of its rarity, clinical characteristics and outcomes are poorly understood, and little is known about the role of bronchoscopic intervention in PSGT. Therefore, the purpose of study was to evaluate the clinical outcomes and prognostic factors after the first treatment. Methods: We analyzed the clinical characteristics, treatment modalities and outcomes of 181 PSGT patients treated from 1995 to 2018 in Samsung Medical Center. Patients were categorized into three groups according to the initial treatment Method: surgical resection with/without adjuvant therapy including bronchoscopic intervention (surgery group = 116), bronchoscopic intervention without surgical resection (bronchoscopic intervention group = 51) and other treatments group (n=14) such as radiotherapy, chemotherapy, and concurrent chemoradiation therapy. A multivariable Cox proportional hazard regression analysis was used to identify independent prognostic factors associated with overall survival and progression-free survival after the first treatment. Results: Among 181 patients, 99 (54.7%) patients were males and the median age was 46 years. Confirmed histology included 104 (57.5%) cases of adenoid cystic carcinoma (ACC), 71 (39.2%) cases of mucoepidermoid carcinoma (MEC) and 6 (3.3%) cases of epithelial-myoepithelial carcinoma (EMC). In surgery group, 21 patients underwent bronchoscopic intervention as bridge therapy before surgical resection because of respiratory distress. Bronchoscopic intervention group was relatively older and had poorer performance status compared to the surgery group. Poor overall survival rate was associated with older age, existence of other malignancy, high clinical stage (III, IV), large tumor size and non-surgery treatments. Lower progression-free survival rate was associated with ACC, large tumor size and non-surgery treatments. Conclusions: Surgical resection was the best treatment as first choice in this study. However, bronchoscopic intervention could be useful as a first-line treatment for non-operable patients and as a bridge therapy prior to having surgery.