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국내·외 누설률에 관한 기준 분석을 통한 국내 연기제어 기준 개선에 관한 연구
김혜원 ( Kim Hye-won ),한지우 ( Han Ji-woo ),이병흔 ( Lee Byeong-heun ),진승현 ( Jin Seung-hyeon ),권영진 ( Kwon Young-jin ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
On this Study, it conducts the Standards investigation about air leakage of Buildings for performance improvement of Smoke control in Fire. In domestic standards, it is incomplete the Criteria standards of air leakage. Therefore it is considered that won’t limit the smoke spread due to stack effect. But in the case of the United States, it conducts the Hot smoke air-Leakage test and it consider that can prevent the Smoke Spread in Compartment.
상수원수 수질변화에 따른 전오존 처리효과 및 경제성 평가
최동훈 ( Dong Hoon Choi ),박진식 ( Jin Sik Park ),문추연 ( Choo Yeun Moon ),이재용 ( Jae Yong Lee ),유동춘 ( Dong Choon Ryu ),장성호 ( Seong Ho Jang ),권기원 ( Ki Won Kwon ),이수애 ( Soo Ae Lee ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.4
This study, changes in raw water quality is to indicate on the efficiency of ozone treatment of each pollutant as compared to derive the appropriate operating measures. The appropriate selection for injection rate of pre-ozone and did not inject pre-ozone assess changes in the water. When good water quality, you not injected of pre-ozone to evaluate the economic efficiency of electricity and put the most cost-effective ozone concentration were evaluated. Evaluation remove organic matter and chlorophyll-a concentration level in experiments with each factor of the water DOC> 2.5㎎ / L, THMFP> 70㎍ / L, Chl-a> 30㎎/㎥or less constant process, if you do not need to put pre-ozone showed little impact. It also does not put you in pre-ozone appropriate produce enough power rate savings was calculated as approximately 90 million won. Ability to remove organic materials and the ability to produce disinfection byproducts, and cost-effective decisions by considering the concentration of injection if pre-ozone 1 mg/L was investigated by the appropriate concentration of ozone injection.
Antiadhesive effect and safety of oxidized regenerated cellulose after thyroidectomy
Kyoung Sik Park,Kyu Eun Lee,Do Hoon Ku,Su-Jin Kim,Won Seo Park2,Hoon Yub Kim3,,Mi Ra Kwon1,Yeo-Kyu Youn1 대한외과학회 2013 Annals of Surgical Treatment and Research(ASRT) Vol.84 No.6
Purpose: To evaluate the antiadhesive effects and safety of an oxidized regenerated cellulose (Interceed) after thyroidectomy. Methods: Seventy-six thyroidectomized patients were prospectively randomized into two groups with regard to the use of Interceed. We evaluated each group for their adhesive symptoms using four subjective and four objective items at the 2nd week, 3rd and 6th month after thyroidectomy. All patients were examined for vocal cord motility by indirect laryngoscope at each period. Results: Total adhesion scores at each postoperative follow-up period decreased with time, but were not significantly different in each group. The median score for swallowing discomfort for liquid was significantly lower in the Interceed group than in the control group 2 weeks after surgery. In addition, the severity of skin adhesion to the trachea was reduced in the Interceed group compared with the control group 6 months after surgery. During the study, there were no adverse effects or significant differences in postoperative complications between the groups. Conclusion: Interceed appeared to be safe and effective in improving neck discomfort at early postoperative periods and preventing skin adhesion to the trachea 6 months after thyroidectomy.
( Jin Yong Choi ),( Jong Man Kim ),( Choon Hyuck David Kwon ),( Jae-won Joh ),( Gyu-seong Choi ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Advanced HCC with portal vein tumor thrombus (PVTT) patients are excluded for liver transplantation (LT), according to the Milan criteria. But after the development of conformal RT, there have been several trials on RT as a bridge or downstaging management approach to LT. The purpose of our study is to evaluate the value of living donor liver transplantation (LDLT) following RT in PVTT patients. Methods: This study took place between May 1996 and March 2013; a, total of 1360 patients were treated by LT in our institution, and 5 of those recipients had RT due to PVTT. To confirm the value of LDLT following RT in PVTT, we did a propensity-matched study retrospectively. Results: There were no statistically significant differences in the clinical characteristics of the two groups. All LT was done by LDLT with duct to duct anastomosis and the mean operation time was 588 minutes. During the follow-up periods, in the LDLT following RT group, two recipients exhibited disease progression, but in the RT alone group, all patients had tumor ingrowths or either intra- or extra- hepatic metastasis. The OS for the LDLT following RT group was 1055 days and that of the RT alone group was 367 days, and there was a statistically significant difference. Conclusions: LDLT following RT can be the treatment of choice for PVTT in select patients and when bile duct anastomosis was performed in RT recipients, a hepaticojejunostomy was recommended to prevent biliary complications.
Treatment of sebaceous hyperplasia with a novel 1,927-nm diode laser
( Won Seon Koh ),( Su Jin Oh ),( Hyoung Il Kwon ),( Eun Jin Kim ),( Jeong Eun Kim ),( Joo Yeon Ko ),( Young Suck Ro ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Sebaceous hyperplasia is a common benign proliferation of sebaceous glands, characterized by yellow or flesh-toned papules with central umbilication. Various methods using CO2 lasers, electrodesiccation, curettage, and acid destruction have been used for the treatment of sebaceous hyperplasia. However, most techniques destruct nonspecific targets and have risk of complications such as scar formation and dyspigmentation. A novel 1,927-nm diode laser (XLENDER^{®} laser, Won Tech., Daejeon, Korea) was recently introduced for the benefits from relatively selective fat and water absorption than previous devices. We report two patients with sebaceous hyperplasia who were treated with the 1,927-nm diode laser. With one session of treatment, skin lesions nearly disappeared. No significant adverse effect including postinflammatory dyspigmentation or scar formation was noted and relapse has not been observed for the follow-up periods of up to 12months. It is assumed that selective heat damage of the sebaceous gland with sparing of the surrounding tissue achieved by the novel 1,927-nm diode laser device produced excellent cosmetic outcome with minimal adverse effects. Herein, we propose this novel 1,927-nm diode laser could be one of the promising options in the treatment of sebaceous hyperplasia.
Jin-Kwon Park,Won-Ju Cho IEEE 2012 IEEE electron device letters Vol.33 No.12
<P>A channel-recessed multifunctional memory (MFM) device was investigated, and a dual read method using a capacitance coupling effect was developed. The nonvolatile memory (NVM) cells using a SiO<SUB>2</SUB>/Si<SUB>3</SUB>N<SUB>4</SUB>/SiO<SUB>2</SUB> gate insulator and the high-speed single-transistor dynamic random access memory (1T-DRAM) cells using a floating-body effect of an SOI substrate were demonstrated in the single-channel-recessed MFM cells. In order for the layer to avoid the interference of operations between NVM and 1T-DRAM modes, a dual read method using the capacitance coupling effect between a front-gate oxide layer and a back-gate oxide was examined. As a result, a large memory window of NVM operation was accomplished by using the back-gate read operation. Furthermore, the reliability of both NVM and 1T-DRAM operations was improved, and the interferences of operation mode between NVM and 1T-DRAM were effectively suppressed.</P>
Efficient terahertz oscillation using a half-period staggered grating resonator
Kwon, Ohjoon,Sattorov, Matlabjon Abdurahimovich,Min, Sun-Hong,Baek, In-Keun,Kim, Seontae,Bera, Anirban,Barik, Ranjan Kumar,Bhattacharya, Ranajoy,Jeong, Jin-Young,Won, Jong-Hyo,Park, Gun-Sik IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.6
A highly efficient terahertz (THz) radiation mechanism is studied with the use of strong interaction between convection electrons and a half-period phase-shifted grating resonator. The large fraction of the fundamental TE mode is longitudinally polarized, and it excites the intense plasma-terahertz wave coupling at the shallow grating, which enables highly efficient RF generation at a relatively low operating voltage. A particle-in-cell (PIC) simulation predicts that the half-period phase-staggered grating resonator generates 0.22 THz wave with output power exceeding 100 W and interaction efficiency of more than 15% at a low beam acceleration voltage of 5.2 kV. (C) 2014 The Japan Society of Applied Physics
Kwon, Hyun-Woo,Paeng, Jin-Chul,Nahm, Francis Sahn-Gun,Kim, Seog-Gyun,Zehra, Tanzeel,Oh, So-Won,Lee, Hyo-Sang,Kang, Keon-Wook,Chung, June-Key,Lee, Myung-Chul,Lee, Dong-Soo The Korea Society of Nuclear Medicine 2011 핵의학 분자영상 Vol.45 No.4
Purpose Although the three-phase bone scan (TBPS) is one of the widely used imaging studies for diagnosing complex regional pain syndrome type I (CRPS-1), there is some controversy regarding the TPBS image criteria for CRPS-1. In this study, we modified the image criteria using image pattern and quantitative analysis in the patients diagnosed using the most recent consensus clinical diagnostic criteria. Materials and Methods The study included 140 patients with suspected CRPS-1 (CRPS-1, n=79; non-CRPS, n=61; mean age $39{\pm}15$ years) who underwent TPBS. The clinical diagnostic criteria for CRPS-1 revised by the Budapest consensus group were used for confirmative diagnosis. Patients were classified according to flow/pool and delayed uptake (DU) image patterns, and the time interval between the initiating event and TPBS ($TI_{event-scan}$). Quantitative analysis for lesion-to-contralateral ratio (LCR) was performed. Modified TPBS image criteria were created and evaluated for optimal diagnostic performance. Results Both increased and decreased periarticular DU were significant image findings for CRPS-1 (CRPS-1 positive-rate=73% in the increased DU group, 75% in the decreased DU group). The $TI_{event-scan}$ did not differ significantly between the different image pattern groups. Quantitative analysis revealed an LCR of 1.43 was the optimal cutoff value for CRPS-1 and diagnostic performance was significantly improved in the increased DU group (area under the curve=0.732). Given the modified image criteria, the sensitivity and specificity of TPBS for diagnosing CRPS-1 were 80% and 72%, respectively. Conclusions Optimally modified TPBS image criteria for CRPS-1 were suggested using image pattern and quantitative analysis. With the criteria, TPBS is an effective imaging study for CRPS-1 even with the most recent consensus clinical diagnostic criteria.