• Journal of Yeungnam Medical Science
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• 제31권2호
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• pp.99-102
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• 2014

Diabetic ketoacidosis (DKA), a fatal acute diabetic complication, is characterized by severe metabolic decompensation and intravascular volume depletion. These conditions may result in hypercoagulability and prothrombic state. Pulmonary thromboembolism (PTE) could be presented as an uncommon and life-threatening complication of DKA. Reported herein is a case involving a 54-year-old male patient who was admitted with DKA due to chronic alcohol consumption and stopping the intake of oral antidiabetic drugs. After low-molecular-weight heparin and warfarin treatment because of PTE during the DKA treatment, the patient's condition improved over the week that he was discharged on insulin and warfarin.

• Journal of Power Electronics
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• 제19권3호
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• pp.637-644
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• 2019

Wireless power transfer (WPT) technology with various transfer mechanisms such as inductive coupling, magnetic resonance and capacitive coupling is being widely researched. Until now, power transfer efficiency (PTE) and power transfer capability (PTC) have been the primary concerns for designing and developing WPT systems. Therefore, a lot of studies have been documented to improve PTE and PTC. However, power consumption in the standby mode, also defined as the no-load mode, has been rarely studied. Recently, since the number of WPT products has been gradually increasing, it is necessary to develop techniques for reducing the standby power consumption of WPT systems. This paper investigates the standby power consumption of commercial WPT products. Moreover, a standby power reduction technique for WPT systems via magnetic resonance coupling (MRC) with a parallel resonance type resonator is proposed. To achieve a further standby power reduction, the voltage control of an AC/DC travel adapter is also adopted. The operational principles and characteristics are described and verified with simulation and experimental results. The proposed method greatly reduces the standby power consumption of a WPT system via MRC from 2.03 W to 0.19 W.

• 한국전자파학회논문지
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• 제28권12호
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• pp.933-940
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• 2017

본 논문에서는 부성 임피던스 변환기(Negative Impedance Converter: NIC)를 적용한 무선전력전송 시스템을 제안하였다. 차폐물질의 영향을 고려하여 전송 시스템을 구성하였다. 전송효율 개선을 위하여 부성 임피던스 변환기에서 발생한 부성저항을 적용하여 송신단의 Q 인자가 향상했다. NIC는 연산증폭기와 저항 소자로 구현하였으며, 특정 저항에 따른 부성저항 특성을 얻었다. 송신 코일의 크기는 $250mm{\times}250mm{\times}0.8mm$이며, 임피던스와 Q 인자는 각각 $31+j1874{\Omega}$, 60이다. 부성저항이 약 $30{\Omega}$일 때, 송신단의 저항이 감소하여 Q 인자는 약 900으로 증가했으며, 이는 기존 대비 약 15배 향상된 결과이다. 제안하는 시스템에 대하여 전송 효율을 측정하였으며, 기존 시스템과 비교하여 효율이 크게 향상되었다. 따라서 NIC의 효과로 전송 효율이 개선될 수 있는 것을 검증하였다.

• The Korean Journal of Ecology
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• 제13권1호
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• pp.33-50
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• 1990

The flora and vegetation of Jindo Archipelago were investigated from 1985 to 1989. In the area, 1089 species, 3 subspecies, 133 varieties, and 22 forma of vascular plants were recovered. From the data, the ecological characteristics such a value 1.39 in Pte-Q and Ch-$D_1-R_3$-e in biological type were recognized. Vegetation of the area is classified into 8 communities: Pinus thunbergii-, Quercus serrata-, Q. variabilis-, Carpinus coreana-, Prunus sargentii-, Camellia japonica-, Castanopsis cuspidata var. sieboldii and Q. acuta-community. The actual vegetation map was conducted with the materials obtained by the investigation of the vegetation in 103 area.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1061-1064
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• 2007

Thin Beam Excimer Laser Annealing is investigated as one possible process enabled by the variable concept of Thin Beam LTPS processing. The structure of the resulting p-Si material is analyzed in terms of grain size distribution, scaling with energy density and overlap, as well as average surface roughness. This process provides similar control and latitude as conventional excimer laser annealing, but reduced average surface roughness and the potential to be scaled to significant productivity levels.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.135-138
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• 1999

In this paper, we designed each matching networks by given input and output impedances of power amplifiers. Mearsured results for IMD and gain flatness are -30㏈c and $\pm$0.2㏈ with 38㏈m output power PEP of PTE10119 at 2.10-2.20㎓ and are -30㏈c and $\pm$0.4㏈ with 42㏈m output power PEP of MRF284 at same frequency range.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.19-29
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• 2007

This paper shares our project management experience in the 2 large-scale projects in managing a diverse international project team of consultants and managing in a foreign land. The first part introduces the two projects, second part addresses management of the projects and the last portion presents some of the challenges we experienced and highlights the importance of understanding the peculiarities of the operating environment, their norms, cultures, effectiveness and limitations of conventional project management tools while operating in a foreign country.

• Journal of Preventive Medicine and Public Health
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• 제53권4호
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• pp.289-292
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• 2020

Yemen has been faced with the worst cholera epidemic of modern times, with more than 1 million suspected cases and 3000 deaths at the time of writing. This problem is largely due to the longstanding civil war between pro-government forces and the Houthi armed movement, which has severely damaged already vulnerable sanitation and healthcare facilities and systems in the country. It is further compounded by a dire lack of basic amenities, chronic malnutrition, and unfavourable weather conditions. Another contributory component may be aerial transfer by cholera-infected chironomid insects. To contain the spread of cholera in Yemen, a nation-wide armistice should be negotiated, and national and local committees must be convened to coordinate efforts on the ground. Community isolation facilities with proper sanitation, reliable disposal systems, and a clean water supply should be set up to isolate and treat sick patients. The continuity of vaccination programmes should be ensured. Public health campaigns to educate local communities about good hygiene practices and nutrition are also necessary. The One Health paradigm emphasizes a multi-sectoral and transdisciplinary understanding and approach to prevent and mitigate the threat of communicable diseases. This paradigm is highly applicable to the ongoing cholera crisis in Yemen, as it demands a holistic and whole-of-society approach at the local, regional, and national levels. The key stakeholders and warring parties in Yemen must work towards a lasting ceasefire during these trying times, especially given the extra burden from the mounting severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) outbreak worldwide.

• Journal of Korean Neurosurgical Society
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• 제57권2호
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• pp.77-81
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• 2015

Objective : The purpose of this study was to investigate changes in the plasma level of vascular endothelial growth factor (VEGF) after Gamma Knife radiosurgery (GKRS) for the treatment of meningioma. Methods : Fourteen patients with meningiomas had peripheral venous blood collected at the time of GKRS and at 1 week, 1 month, 3 month and 6 month visits. Plasma VEGF levels were measured using commercially available enzyme-linked immunosorbent assay. For controls, peripheral blood samples were obtained from 20 healthy volunteers. Results : The mean plasma VEGF level (29.6 pg/mL) in patients with meningiomas before GKRS was significantly lower than that of the control group (62.4 pg/mL, p=0.019). At 1 week after GKRS, the mean plasma VEGF levels decreased to 23.4 pg/mL, and dropped to 13.9 pg/mL at 1 month, 14.8 pg/mL at 3 months, then increased to 27.7 pg/mL at 6 months. Two patients (14.3%) with peritumoral edema (PTE) showed a level of VEGF 6 months after GKRS higher than their preradiosurgical level. There was no significant association found in an analysis of correlation between PTE and tumor size, marginal dose, age, and sex. Conclusion : Our study is first in demonstrating changes of plasma VEGF after stereotactic radiosurgery (SRS) for meningioma. This study may provide a stimulus for more work related to whether measurement of plasma level has a correlation with tumor response after SRS for meningioma.

• 한국수자원학회논문집
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• 제47권10호
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• pp.959-972
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• 2014

본 연구에서는 멀티프랙탈 이론을 기반으로 시 공간 격자강우장 생산 모형을 충주댐 상류유역에 발생한 9개의 홍수 사상에 대하여 검증하였다. 이를 위하여 기상청의 레이더 강우자료에 대한 시공간 멀티프랙탈 특성을 분석하였으며, 로그 포아송 분포와 3차원 웨이브렛 함수 기반의 시 공간 격자 강우생산 모형을 활용하여 관측강우의 멀티프랙탈 특성을 재현하는시 공간 가상강우장을 생산하였다. 생성된 가상강우장을 S-RAT 분포형 수문모형에 입력값으로 적용하여 유역출구에서의 반응을 관측강우 및 시공간적으로 균등한 분포를 가진강우장에 대하여 산출된 유역출구에서의 반응과 비교하였다. 관측 강우장과 가상강우장, 관측강우장과 저해상도 강우장에 대하여 RMSE, RRMSE, MAE, SS, 그리고 NPE, PTE 등을 이용하여 오차분석을 수행한 결과, 평균적으로 첨두홍수량은 20.03% 증가하였고, 첨두시간은 0.81% 감소하였다.