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Ryu, Myong-Jin,Ryu, Dong-Ki,Chung, Sun-Ok,Hur, Yun-Kun,Hur, Seung-Oh,Hong, Soon-Jung,Sung, Je-Hoon,Kim, Hak-Hun Korean Society for Agricultural Machinery 2014 바이오시스템공학 Vol.39 No.1
Purpose: In protected crop production facilities such as greenhouse and plant factory, farmers should be present and/or visit frequently to the production site for maintaining optimum environmental conditions and better production, which is time and labor consuming. Monitoring of environmental condition is highly important for optimum control of the conditions, and the condition is not uniform within the facility. Objectives of the paper were to investigate spatial and vertical variability in ambient environmental variables and to provide useful information for sensing and control of the environments. Methods: Experiments were conducted in a strawberry-growing greenhouse (greenhouse 1) and a cherry tomato-growing greenhouse (greenhouse 2). Selected ambient environmental variables for experiment in greenhouse 1 were air temperature and humidity, and in greenhouse 2, they were air temperature, humidity, PPFD (Photosynthetic Photon Flux Density), and $CO_2$ concentration. Results: Considerable spatial, vertical, and temporal variability of the ambient environments were observed. In greenhouse 1, overall temperature increased from 12:00 to 14:00 and increased after that, while RH increased continuously during the experiments. Differences between the maximum and minimum temperature and RH values were greater when one of the side windows were open than those when both of the windows were closed. The location and height of the maximum and minimum measurements were also different. In greenhouse 2, differences between the maximum and minimum air temperatures at noon and sunset were greater when both windows were open. The maximum PPFD were observed at a 3-m height, close to the lighting source, and $CO_2$ concentration in the crop growing regions. Conclusions: In this study, spatial, vertical, and temporal variability of ambient crop growing conditions in greenhouses was evaluated. And also the variability was affected by operation conditions such as window opening and heating. Results of the study would provide information for optimum monitoring and control of ambient greenhouse environments.
Sang Hoon Baek,Seok Keun Choi,Jiwook Ryu,Lee Sung Ho 대한말초신경학회 2017 The Nerve Vol.3 No.2
Spontaneous subdural empyema is a rare disease in developed society, especially in adults. A 30-year-old male visited our clinic with alteration of consciousness as the main symptom. On initial computed tomography (CT), subdural hematoma was suspected but after performing craniectomy, the lesion was identified as a subdural empyema. Thus, we inserted and maintained a continuous irrigation and drainage catheter for the short term using broad spectrum antibiotics. The patient underwent another operation to remove the remnant empyema and 3 months of rehabilitation following the second operation, after which he went on to lead a normal life without neurologic deficit.
Bed Combustion in a Furnace Enclosure - a Model for the MSW Incinerator
Ryu, Chang-Kook,Shin, Dong-Hoon,Choi, Sang-Min The Korean Society of Combustion 2002 한국연소학회지 Vol.7 No.1
The bed combustion in an incinerator interacts with the gas flow region through heat and mass transfer. Combined bed combustion and gas flow simulations are performed to investigate this coupled interaction for various operating conditions and furnace configurations. Radiation onto the bed from the furnace is interrelated with the combustion characteristics in the bed, and is also affected by the flow pattern in the gas flow region. Since the contribution of gaseous emission to the total radiation is significant, an adequate flow pattern in a well-designed furnace shape would lead to an increased heat influx on the bed, especially in the early stage of the waste combustion. Advancing the initiation point of the waste combustion can also reduce the size of the lower gas temperature region above the bed, which can be achieved by controlling operating conditions such as the waste feeding rate, the bed height and the primary air flow distribution.
Diastolic Dysfunction and Outcome in Acute Ischemic Stroke
Ryu, Wi-Sun,Park, Jun-Bean,Ko, Sang-Bae,Hwang, Seung-sik,Kim, Yong-Jin,Kim, Dong-Eog,Lee, Seung-Hoon,Yoon, Byung-Woo S. Karger AG 2016 Cerebrovascular Diseases Vol.41 No.3
<P>Background: Left ventricular diastolic dysfunction (DD) is associated with an increased mortality in general population and patients with myocardial infarct. In the present study, we investigated whether DD is associated with outcomes after ischemic stroke. Methods: Five hundred and three acute ischemic stroke patients with normal left ventricular ejection fraction (>= 50%) were retrospectively included. Echocardiography and tissue Doppler imaging were used to evaluate and grade diastolic function. Ordinal logistic and Cox regression analyses were used to examine relations between DD and modified Rankin Scale (mRS) score at 3 months and mortality after stroke, respectively. Results: Mean age was 67.2 +/- 11.8 years and 63% were men. Among parameters of diastolic function, early mitral inflow velocity/early diastolic mitral annulus velocity (E/e') was independently related with higher mRS score at 3 months and mortality after ischemic stroke. The highest quartile of E/e' (> 14) was independently associated with higher mRS score (adjusted OR 3.86, 95% CI 2.27-6.54) as well as with mortality (hazards ratio [HR] 2.87, 95% CI 1.17-7.04) as compared to the lowest quartile of E/e' (< 8.8). In addition, moderate-to-severe DD grade was related to higher mRS score (adjusted OR 2.41, 95% CI 1.15-5.06) and mortality (HR 6.63, 95% CI 1.80-24.43) compared to the normal diastolic function. Conclusion: In patients with ischemic stroke, DD is associated with functional outcome at 3 months and mortality. Our data suggest that more attention should be given to DD in patients with ischemic stroke. (C) 2016 S. Karger AG, Basel</P>