• Journal of Korean Tunnelling and Underground Space Association
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• v.22 no.5
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• pp.543-561
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• 2020

This paper is the result of the study on the effect of the support structure of the tunnel steel rib. In tunnel excavation, the top and bottom half excavation methods result in subsidence of steel rib reinforcement due to insufficient support of steel rib reinforcement when the ground is poor after excavation. The foundation of the steel rib installed in the upper half excavates the bottom part of the base, causing the subsidence to occur due to various effects such as internal load and lateral pressure. As a result, the tunnel is difficult to maintain and its safety is problematic. To solve these problems, steel rib support structures have been developed. For the purpose of verification, the behavior of the supporting structure is verified by model experiments reduced to shotcrete and steel rib material similarity, the numerical analysis of ΔP and ΔP generated by bottom excavation by Terzaghi theoretical equation. As a result, it was found that the support structure of 20.100~198.423 kN is required for the 10~40 m section of the depth for each soil of weathered soil~soft rock. In addition, as a result of the reduced model experiment, a fixed level of 50% steel rib deposit of steel rib support structure was installed. The study shows that the installation of steel rib support structures will compensate for uncertainties and various problems during construction. It is also thought that the installation of steel rib support structure will have many effects such as stability, economy, and air reduction.

• Asian Journal of Atmospheric Environment
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• v.6 no.4
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• pp.259-267
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• 2012

To clarify the effects of black carbon (BC) particles on growth and gas exchange rates of Asian forest tree species, the seedlings of Fagus crenata, Castanopsis sieboldii, Larix kaempferi and Cryptomeria japonica were exposed to BC particles with sub-micron size for two growing seasons from 1 June 2009 to 11 November 2010. The BC particles deposited after the exposure to BC were observed on the foliar surface of the 4 tree species. At the end of the experiment, the amount of BC accumulated on the foliar surface after the exposure to BC aerosols were 0.13, 0.69, 0.32 and 0.58 mg C $m^{-2}$ total leaf area in F. crenata, C. sieboldii, L. kaempferi and C. japonica seedlings, respectively. In August 2010, the exposure to BC particles did not significantly affect net photosynthetic rate under any light intensity, stomatal diffusive conductance to water vapour ($g_s$), stomatal limitation of photosynthesis, response of $g_s$ to increase in vapour pressure deficit and leaf temperature under light saturated condition in the leaves or needles of the seedlings. These results suggest that the BC particles deposited on the foliar surface did not reduce net photosynthesis by shading, did not increase leaf temperature by absorption of irradiation light, and did not induce plugging of stomata in the leaves or needles of the seedlings. There were no significant effects of BC particles on the increments of plant height and stem base diameter during the experimental period and the whole-plant dry mass at the end of the experiment. These results indicate that the exposure to BC particles with sub-micron size for two growing seasons did not significantly affect the growth and leaf or needle gas exchange rates of F. crenata, C. sieboldii, L. kaempferi and C. japonica seedlings.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.477-481
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• 2007

The emergency patient who occurs from the place where it is various the control which is quick must come to accomplish in Ubiquitous environment. In the body of the patient or the old person the organism signal sensor about under attaching condition of the patient at real-time about under the monitor ring about under disposing the control which is quick against the emergency patient does to become accomplished at the case real-time when the above will get in the body of the patient or the old person. Using ZigBee (802.15.4) system base on Shor wireless communication protocol because of complement wireless of hospital. This system use ZigBee (802.15.4) system to get for electrocardiogram, blood pressure and pulse bio-sensors. This paper constructs Bio-Sensor communication monitoring system and transmission rate and the delay which it follows possibility and node occurrence rate of wireless sensor network construction hour transmission session it leads and it verifies the effectiveness.

• Journal of Oriental Neuropsychiatry
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• v.7 no.1
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• pp.1-13
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• 1996

1. Out of 21 examples on a clinical base Alzheimer type dementia were 8 examples(38%), 11 vascular types(52%), 1 Alzheimer and vascular mixed type and rest 1 was secondary dementia type(NPH).2. Between the genders, there were 5 males and 3 females for Alzheimer types, 6 males and 5 females for the vascular types, 1 male for Alzheimer and vascular mixed type, and 1 female for secondary dementia type(NPH).3. For the degrees of Alzheimer type dementia there were 2 mild dementia, 4 moderate dementia, and 2 severe dementia. 4. Among the Alzheimer types 2 mild dementia were almost recovered back to normal in approximately 2 months, 2of 4 moderate dementia became significantly better in approximately 2 months and recovered to almost normal state in 3 to 5 months. The rest 2 have been under treatment for 3 months, but showed a little improvement. Out of 2 severe dementia examples, one showed a little improvement even if it has been under treatment over 2 years. The other example did not show any improvement, but dementia did not proceed any more.5. Among the 11 vascular examples, 7 recovered in 2 to 3 months, 1 in 5 months, 2 recovered in a year, and the treatment was stopped arbitrary for the last one.6 In the case of Alzheimer and vascular mixed type dementia, even the moderate dementia did not show any apparent result in 6 months.7. For NPHI (Normal Pressure Hydrocephalus), there was an improvement on dementia in 2 months after the treatment, but gait disturbance and urinary incontinence did not show any noticeable difference. As a conclusion, almost all the Alzheimer and vascular type patients recovered, but the treatment periods varied depending on the types of the dementia and the degree of seriousness, especially in the case of the severe Alzheimer patients, the treatment oniy suppression the progression of the dementia. The most important aspect from clinical point of view was even if almost all the patients were almost completely cired, they need to keep being cured for a long period of time. The method with respect to Four Constitutions is thought of the most desirable.

• Pediatric Infection and Vaccine
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• v.7 no.2
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• pp.250-256
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• 2000

The incidence of tuberculosis has been decreased, and especially the incidence of severe complicated tuberculosis has been markedly decreased as the result of widely used BCG vaccines. But tuberculosis is still an important community accquired infectiouse disease in the world despite continued worldwide efforts to control the disease. Miliary tuberculosis, the most serious complicated tuberculosis, can be occurred by lymphohematogenous dissemination of tuberculosis, and intracranial tuberculoma with or without tuberculosis meningitis can be developed in case of miliary tuberculosis. In general, serious tuberculosis infections such as miliary tuberculosis and CNS tuberculosis are developed especially in young infants and children in cases of delayed diagnosis and treatment despite receiving BCG vaccination, and usually those patients have contact sources. Intrcranial tuberculoma in children are usually found near infratentorial site at the base of cerebellum, and clinically symptoms and signs of increased intracranial pressure developed before treatment. Serial brain CT or MRI is a good non-invasive diagnostic modality of intracranial tuberculoma. Although surgical intervention was initially advocated as the mainstay of intracranial tuberculoma therapy, but many recent clinical studies indicate that intracranial tuberculoma can be cured with medical treatment alone. We experienced a case of 3 months old male patient, who was diagnosed as having miliary tuberculosis associated with multiple intracranial tuberculoma. He received BCG vaccination at 4 weeks after birth, and his father was confirmed as active pulmonary tuberculosis patient after this patient's admission. We report this case with a review of related literatures.

• Childhood Kidney Diseases
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• v.11 no.2
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• pp.294-298
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• 2007

Moyamoya disease is a progressive cerebrovascular disorder with stenosis or occlusion of the bilateral internal carotid arteries with abnormal vascular networks at the base of the brain. Previous reports have shown that there are extracranial vascular involvements in Moyamoya disease, especially in the renal artery. We report a 7-year-old patient with Moyamoya disease associated with renovascular hyper tension, who presented in infancy with seizures and hemiparesis. Renal angiography showed multiple stenoses of the right renal artery. Although renal artery stenosis in Moyamoya disease has been effectively treated with balloon angioplasty, stent implantation, or surgery, bat-loon angioplasty could not be done in this patient due to multiple stenoses. His blood pressure was successfully controlled with medical treatment, and remained normotensive during the follow up period of 6 months.

• Journal of Trauma and Injury
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• v.27 no.4
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• pp.133-138
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• 2014

Purpose: If the survival of patients suffering from severe blunt trauma is to be improved, appropriate interventions should be taken immediately. The purpose of this study is to evaluate the clinical utility of end-tidal carbon dioxide ($ETCO_2$) as a surrogate marker for predicting both the need for intervention and the prognosis. Methods: This is a prospective observational study. Nasal cannula was applied to measure $ETCO_2$, and the following parameters, which are known to be related to the prognosis for a patient, were recorded: injury severity score (ISS), revised trauma score (RTS), arterial blood gas (ABG), lactate, and hemoglobin (Hb). To evaluate the outcome, we investigated the details of emergent interventions and expired patients. Results: A total of 93 patients were enrolled in this study. Emergent intervention was significantly associated with systolic blood pressure (sBP, p-value=0.001), $ETCO_2$ (p-value<0.001), serum lactate level (p-value<0.001), pH (p-value< 0.003), $HCO_3$ (p-value=0.004), base excess (p-value<0.002), ISS (p-value<0.001) and RTS (p-value=0.005). In the multivariate logistic regression, only $ETCO_2$ (odds ratio (OR): 0.897, 95% confidence interval (CI): 0.792-0.975, p-value= 0.048) and ISS (OR: 1.132, 95% CI: 1.053-1.233, p-value=0.002) were associated with emergent intervention whereas $ETCO_2$ (p-value=0.973) and ISS (p-value=0.511) were not statistically significant in predicting the survival of patients in the univariate analysis. An optimal ETCO cut-off of 29 mmHg on the ROC curve was determined, with the area under the ROC curve (AUC) being 0.824 (0.732-0.917)]. Conclusion: This study has revealed that $ETCO_2$, which can be rapid and easily measured through a nasal cannula, and the ISS may be prognostic indicators of emergent interventions in Emergency Departments.

• The Korean Journal of Nuclear Medicine
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• v.29 no.1
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• pp.22-30
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• 1995

To predict preoperatively the safety of permanent occlusion of an internal carotid artery with $^{99m}Tc$-HMPAO brain single photon emission computed tomography(SPECT) from an objective point of view, Twenty-four patients underwent balloon test occlusion (BTO) of the internal carotid arteries because of neck and skull base tumors. The authors assessed the uptake of both middle cerebral artery territories before and during BTO with $^{99m}Tc$-HMPAO brain SPECT using semiquantitative analysis method and compared the results with other factors(neurologic examination, arterial stump pressure and electroenceph-alogram). Nineteen patients had not experienced neurological deteriorating or any problem during BTO. Their comparative uptakes of the middle cerebral artery territories were 95 to 101% of the pre-BTO state. The remaining five patients showed severe neurologic symptoms such as transient hemiplegia and unconsciousness. Their comparative uptake of the middle cerebral artery territories were 77 to 85% of the pre-BTO state, and were well matched with other factors. $^{99m}Tc$-HMPAO brain SPECT before and during BTO seems to be a simple and objective method for prediction of permanent neurologic deficits when the comparative uptake of middle cerebral artery territories during BTO is lower than 85% of that before BTO.

• Membrane Journal
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• v.28 no.3
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• pp.157-168
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• 2018

Potassium tannate (TA-K), which is prepared by base treatment of the bio-renewable tannic acid (TA), was evaluated for its potential application as a draw solute for water purification by forward osmosis. The forward osmosis and recovery properties of TA-K were systematically investigated. In the application of forward osmosis through the active layer facing feed solution (AL-FS) method, the water flux of TA-K draw solution was significantly higher than that of the TA draw solution, while that of the latter was not identified. At a low concentration of 100 mM, the osmotic pressure (1,135 mOsmol/kg) of the TA-K draw solution was approximately 6.5 times that (173 mOsmol/kg) of the NaCl draw solution. Furthermore, the water flux and specific salt flux (6.14 LMH, 1.26 g/L) of the TA-K draw solution at 100 mM were approximately 2.5 and 0.5 times those of the NaCl draw solution (2.46 LMH, 2.63 g/L) at the same concentration, respectively. For reuse, TA-K was precipitated by using a metal ion and recovered through membrane filtration. This study demonstrates the applicability of a phytochemical material as a draw solute for forward osmosis.

• Applied Chemistry for Engineering
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• v.17 no.3
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• pp.321-326
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• 2006

Thermal degradation of styrene dimer fraction (SDF, main compound: 47 wt% of 1,3-diphenylpropane), 5~15% of total products produced during decomposition of waste expanded polystyrene (WEPS) was investigated. Reaction condition of $360^{\circ}C$, and 152 kPa to 202 kPa was an optimum for high pressure degradation. Under this operating condition, the yield of oil was 73.8% and the selectivities to Ben, Tol, EB, SM, and AMS were 0.4, 30.9, 15.0, 19.6, and 4.2%, respectively. Non-catalytic fixed bed continuous degradation was conducted at reaction temperatures of $510{\sim}610^{\circ}C$ and contact time ranges of 2~24 min, where the yield was increased by increasing of reaction temperature and contact time. A $Cr_2O_3$ catalyst showed the highest activity and SM yield among acid, base, and redox catalysts. The conversion of 74.6% and the yield of Ben, Tol, EB, SM, and AMS were 0.4, 21.6, 9.7, 17.9, and 3.5%, respectively at $560^{\circ}C$ and contact time of 24 min. It is thought that styrene is converted to EB and other secondary products throughout the formation of diradicals of styrene.