• 한국물환경학회지
• /
• 제33권3호
• /
• pp.334-340
• /
• 2017

A pilot-scale electrodialysis system was designed and constructed to treat groundwater polluted with arsenic and manganese. Synthetic groundwater, in which some amount of arsenic and manganese was added to make 500 mg/L of Mn and $50{\mu}g/L$ of As, was used as a feed for the ED system. The limiting current density, linear water velocity, applied voltage, and membrane surface area were investigated to obtain efficient and economic operation of the ED system. The linear water velocity was increased 0.74 cm/s to 11 cm/s based on evaluation of limiting current density. The water quality of diluate for 85 minutes of operation was satisfied with water quality criteria for drinking water using the ED system with 14 pairs of ion exchange membranes. The increased membrane pairs to 21 and 42 pairs were very effective to reduce conductivities of the diluate. The operation cost of the ED system was assessed using specific energy consumption, which was $1.065{\sim}1.2kWh/m^3$. Considering low salt concentrations of the groundwater, improvement of the ED system are required to increase current utilization and to apply low voltage while the ED system was applicable to produce drinking water.

• Journal of Electrical Engineering and Technology
• /
• 제13권5호
• /
• pp.1778-1790
• /
• 2018

Based on the requirements and characteristics of multi-zone autonomous decision-making in modern power system, fully distributed computing methods are needed to optimize the economic dispatch (ED) problem coordination of multi-regional power system on the basis of constructing decomposition and interaction mechanism. In this paper, four fully distributed methods based on alternating direction method of multipliers (ADMM) are used for solving the ED problem in distributed manner. By duplicating variables, the 2-block classical ADMM can be directly used to solve ED problem fully distributed. The second method is employing ADMM to solve the dual problem of ED in fully distributed manner. N-block methods based on ADMM including Alternating Direction Method with Gaussian back substitution (ADM_G) and Exchange ADMM (E_ADMM) are employed also. These two methods all can solve ED problem in distributed manner. However, the former one cannot be carried out in parallel. In this paper, four fully distributed methods solve the ED problem in distributed collaborative manner. And we also discussed the difference of four algorithms from the aspects of algorithm convergence, calculation speed and parameter change. Some simulation results are reported to test the performance of these distributed algorithms in serial and parallel.

• 대한임상독성학회지
• /
• 제21권2호
• /
• pp.108-116
• /
• 2023

Purpose: This study investigated the differences between patients with acute carbon monoxide (CO) poisoning who visited the emergency department (ED) before and during the coronavirus disease 2019 (COVID-19) pandemic. Methods: This was a single-center retrospective observational study. Patients with CO poisoning who visited the ED during the period from February 2020 to January 2023 were classified as the COVID-19 pandemic group, and those from February 2019 to January 2020 were classified as the non-pandemic group. Patients' medical records were reviewed, their demographic and clinical characteristics were compared, and the length of stay in ED was checked. The time from admission to the ED to the start of hyperbaric oxygenation (HBO) was defined as the door-to-HBO time, and this parameter was compared between both groups. Results: In total, 672 patients were included in this study. The proportion of intentional poisoning was significantly higher in the COVID-19 pandemic group than in the non-pandemic group (p=0.028). The proportion of intentional poisoning significantly increased in the 20- to 29-year-old age group during the COVID-19 pandemic (p<0.001). In addition, it took longer to initiate HBO in the COVID-19 pandemic group than in the non-pandemic group (p=0.001). Conclusion: These findings suggest that pandemics of infectious diseases, such as COVID-19, increase the proportion of intentional CO poisoning, and it may take longer to initiate HBO after visiting the ED. Efforts will be needed to decrease intentional CO poisoning and length of stay in ED.

• Korean Journal of Radiology
• /
• 제22권11호
• /
• pp.1809-1821
• /
• 2021

Ovarian cystadenofibroma is a benign ovarian tumor that is characterized by a consistent percentage of masses, which remain indeterminate in ultrasonography and require magnetic resonance (MR) investigation; they may mimic borderline or malignant lesions. Three main morphologic patterns, resembling different ovarian neoplasms, can be identified in cystadenofibromas: multilocular solid lesions, unilocular cystic lesions with parietal thickening, and purely cystic masses. However, a cystoadenofibroma has typical features, such as T2-weighted hypointensity associated with no restrictions in diffusion-weighted imaging (the so-called "dark-dark appearance") and progressive post-contrast enhancement (type I perfusion curve). The purpose of this study was to review the features of ovarian cystadenofibromas in MR imaging and to suggest pearls and pitfalls regarding their correct diagnosis.

• Asian-Australasian Journal of Animal Sciences
• /
• 제29권4호
• /
• pp.479-486
• /
• 2016

A previous genome-wide association study (GWAS) exposed histone deacetylase 2 (HDAC2) as a possible candidate gene for breast muscle weight in chickens. The present research has examined the possible role of HDAC2 in skeletal muscle development in chickens. Gene expression was measured by quantitative polymerase chain reaction in breast and thigh muscles during both embryonic (four ages) and post-hatch (five ages) development and in cultures of primary myoblasts during both proliferation and differentiation. The expression of HDAC2 increased significantly across embryonic days (ED) in breast (ED 14, 16, 18, and 21) and thigh (ED 14 and 18, and ED 14 and 21) muscles suggesting that it possibly plays a role in myoblast hyperplasia in both breast and thigh muscles. Transcript abundance of HDAC2 identified significantly higher in fast growing muscle than slow growing in chickens at d 90 of age. Expression of HDAC2 during myoblast proliferation in vitro declined between 24 h and 48 h when expression of the marker gene paired box 7 (PAX7) increased and cell numbers increased throughout 72 h of culture. During induced differentiation of myoblasts to myotubes, the abundance of HDAC2 and the marker gene myogenic differentiation 1 (MYOD1), both increased significantly. Taken together, it is suggested that HDAC2 is most likely involved in a suppressive fashion in myoblast proliferation and may play a positive role in myoblast differentiation. The present results confirm the suggestion that HDAC2 is a functional gene for pre-hatch and post-hatch (fast growing muscle) development of chicken skeletal muscle.

• 시스템엔지니어링학술지
• /
• 제7권2호
• /
• pp.1-5
• /
• 2011

The purpose of the Environment Design (ED) for Main Control Room (MCR) of Nuclear Power Plant (NPP) is to provide and create an optimal working space to be free from physical, physiological and mental stress as well as environmental discomfort, based on the previous environment design experiences and to recommend the best ED including the color, the lighting and the interior design. Environment Design consists of three main areas: Human factor engineering design, Interior design with color design, and Lighting design. These design areas have been interactively cooperated in a way that each design specialist would share the objectives and concepts of the Environment Design for MCR. The specialists for Human Factors Engineering design had a corporative role in such a way to provide the guidelines for MCR design suitability of Interior and Lighting design considering the Human System Interface (HSI) safety concerns. This paper describes fruitful efforts to create the best fit for MCR ED among several design proposals with the design recommendations, impacts, and contributions to NPP environment.

• Communications for Statistical Applications and Methods
• /
• 제9권2호
• /
• pp.565-576
• /
• 2002

We propose a new sampling design for the 2001 Health Index Survey at Seoul. In this stratified two-stage sampling design, the ED(enumeration district) of 2000 Population and Housing Census is used as primary sampling unit and the Gu is used as stratification variable in order to obtain the sub-domain estimate for 25 Gu's as well as population estimate for Seoul. The sample ED's are systematically selected after the Ed's are ordered by location and property to obtain a representative sample. And also, the imputation methods for item nonresponses are suggested.

• 한국염색가공학회지
• /
• 제33권3호
• /
• pp.97-104
• /
• 2021

In this study, the dyeability of m-aramid fabric with various cationic dyes using two bath two step dyeing method were investigated. The exhaustion properties of Doracryl series recommend for aramid(Doracryl^® Red GL 100%(DR), Doracryl^® Blue GL 300%(DB), Doracryl^® Yellow XGRL 200%(DY)) and commercial cationic Synocryl series(Synocryl^® Red GRL ED(SR), Synocryl^® Blue GSL ED(SB), Synocryl^® Yellow 3RL ED(SY)) for acrylic were measured by using Dye-O-meter. In the presence of carrier, the exhaustions of Doracryl series were higher to those of Synocryl series and the opposite phenomenon was observed in the absence of carrier. And the severe migrations of cationic dyes to acetate, nylon and wool fabrics were observed without carrier.

• 한국양식학회지
• /
• 제18권3호
• /
• pp.147-153
• /
• 2005

본 연구의 목적은 양식산 볼락, Sebastes inermis Cuvier의 자 치어 시기부터 성어에 이르기까지의 성장 특성을 조사하여, 본 종에 대한 수산생물학적 연구 및 양식기술개발을 위한 기초 자료를 제공하는데 있다. 이를 위하여 250마리의 어미로부터 생산된 동일한 일령의 자어를 대상으로 산출 직후부터 1,350일째까지의 성장 특성을 조사하였다. 볼락에 있어서 산출 후 경과 일수(days after parturition, X)에 대한 전장(total length, TL)의 성장은 $TL=0.0217X\;(r^2=0.8867)$, 그리고 체중(body weight, BW)의 성장은 $BW=0.0001X^2+0.0713X\;(r^2=0.9858)$의 관계가 있었다. 또한 전장에 대한 체중의 상대성장은 $BW=0.0072TL^{3.4373}\;(r^2=0.9945)$의 관계가 있는 것으로 나타났다. 산출 후 경과일수(X)에 따른 눈지름(eye diameter, ED) 성장은 $ED=-2E-5X^2+0.0326X$ ($r^2=0.9886;$ X, 산출 후 기일)의 관계식에 따랐다. 전장에 대한 두장(head length, HL), 주둥이길이 (snout length, PHL) 눈지름(ED), 후두부길이(postorbital head length, PHL)와의 관계는 각각 $HL=0.2652TL\;(r^2=0.9758),\;SL=0.0613TL\;(r^2=0.9602),\;ED=0.0752TL\;(r^2=0.9715)$, 및 $PHL=0.2652TL\;(r^2=0.9501)$로 나타났다.

• 한국시뮬레이션학회논문지
• /
• 제25권2호
• /
• pp.51-61
• /
• 2016

최근 응급의료 서비스의 환자 만족도에 대한 관심이 높아지고 있는 가운데 사물인터넷(IoT: Internet of Things)을 활용한 프로세스 개선에 많은 노력을 기울이고 있다. 본 연구는 IoT기술을 응급실 운영에 활용한 스마트 응급실의 핵심 기술을 살펴보고, 의사와 간호사의 의사결정을 지원하는 진료테스크 우선순위 결정 알고리즘을 제시한다. 제시한 알고리즘은 진료테스크 선정에 따른 책임소재, 환자 불평, 위급환자 진료 지연, 체류시간 길어짐 등의 의사결정 리스크를 최소화한다. 이를 통해 의료진의 감정 육체 소진(Burn-out)을 줄이고 친절과 배려가 있는 환자 진료 케어를 가능하게 하여 환자 만족도와 응급실 의료진의 근무 만족도를 높이고 나아가 간호사의 정체성 제고에 도움을 줄 수 있다. 가상의 응급실을 대상으로 시뮬레이션을 수행한 결과 환자 체류시간 측면에서도 우수한 성능을 보였다.