• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.664-675
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• 2010

Recently environment-friendly construction method is major trend in both domestic and world constrction fields. In this paper High Functional Performance Agent(Hi-FA) which has various improved engineering characteristics different with conventional Portland cement grouting, such as high viscosity, liquidity, void filling ability, early hardening, and separation resistance, was analyzed by field and laboratory test. Also soil improvement and existing deep foundation protection works were performed and analyzed using Hi-FA.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.676-686
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• 2010

Damage Cases of variously type are reported that the ground subsidence is caused by the underground cavities at structure and construction works in lime stone or abandoned zone. A underground cavities by direct for zone having an effect on structure have been filled with cement agents. But this measure is urgently needed in materials and work methods, because ground water pollution at water down fillings and flow out, ground disturb at high participle, damage of farms and fishery. The research confirm application of filling method and filling materials of environmentally friendly and economical by Hi-FA new materials have both liquidity and viscosity from case reinforcement in APT site, Gunsan.

• 원자력산업
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• 제30권4호
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• pp.24-25
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• 2010

• 한국정보과학회논문지:정보통신
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• 제30권3호
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• pp.343-354
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• 2003

본 논문에서는 멀티캐스트 환경에서 핸드오프 시 발생하는 패킷손실의 회복 지연시간을 최소화하는 알고리즘을 제안하였다. 제안한 알고리즘은 선행 연구인 PMTP(Predictable Multicast Protocol)와 FN(Foreign Network)간의 연계를 통해 신뢰성을 보장하며, 이동한 외부네트워크의 FA(Foreign Agent) 의 상태에 따라 터널링과 멀티캐스트 그룹 재 가입을 사용하여 양방향(hi-directional tunneling)과 원격가입(remote subscription)을 독립적으로 사용하는 경우에 발생되는 라우팅의 비효율성과 핸드오프 지연을 해결하였다. 한편, 핸드오프 지연에 의해 발생되는 패킷손실을 핸드오프 시 등록정보와 손실된 패킷 정보를 함께 전송하여 이전 FA나 현재 FA가 핸드오프 수행과 동시에 핸드오프 지연동안의 패킷손실을 최소한의 시간에 회복할 수 있도록 한다. 성능분석 결과, 제안하는 방식은 기존의 핸드오프 절차에 추가 변경 없이 사용 가능하며 양방향 방식과 원격가입 방식보다 핸드오프와 에러회복 시간에 있어 높은 성능을 보이는 것을 확인하였다.

• The Korean Journal of Pain
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• 제33권3호
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• pp.275-283
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• 2020

Background: Previous studies showed neurography and tractography of the greater occipital nerve (GON). The purpose of this study was determining diffusion tensor imaging (DTI) parameters of bilateral GONs and dorsal root ganglia (DRG) in unilateral cervicogenic headache as well as the grading value of DTI for severe headache. The correlation between DTI parameters and clinical characteristics was evaluated. Methods: The fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values in bilateral GONs and cervical DRG (C2 and C3) were measured. Grading values for headache severity was calculated using a receiver operating characteristics curve. The correlation was analyzed with Pearson's coefficient. Results: The FA values of the symptomatic side of GON and cervical DRG (C2 and C3) were significantly lower than that of the asymptomatic side (all the P < 0.001), while the ADC values were significantly higher (P = 0.003, P < 0.001, and P = 0.003, respectively). The FA value of 0.205 in C2 DRG was considered the grading parameter for headache severity with sensitivity of 0.743 and specificity of 0.999 (P < 0.001). A negative correlation and a positive correlation between the FA and ADC value of the GON and headache index (HI; r = -0.420, P = 0.037 and r = 0.531, P = 0.006, respectively) was found. Conclusions: DTI parameters in the symptomatic side of the C2 and C3 DRG and GON were significantly changed. The FA value of the C2 DRG can grade headache severity. DTI parameters of the GON significantly correlated with HI.

• 한국지반공학회논문집
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• 제19권3호
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• pp.93-104
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• 2003

간단한 제하/재재하 구성방정식을 이용하여 기존의 교란상태개념(DSC)모델을 수정하였고, 그 수정된 DSC모델을 비선형 동역학적 유한요소 프로그램인 DSC_DYN2D에 수치해석적으로 접목(implementation)하였다. 본 연구에서 이용한 구성방정식 DSC 모델은 상대적으로 손상받지 않은 상태(RI)를 정의하기 위하여 HiSS모델을 이용하였고, 완전파괴상태(FA)는 한계상태모델을 이용하였다. 이렇게 수정된 DSC_DYN2D 프로그램을 이용하여 동하중을 받는 현장파일 및 그 주변 지반의 거동을 수치해석적으로 모사 하였다. 해석 결과를 기존의 HiSS모델을 이용한 해석결과와 비교, 분석하였다. 비교결과, DSC모델을 이용하여 해석한 결과가 HiSS모델로 해석한 결과보다 현장계측과 유사하였다. 이를 통해 DSC모델을 이용한 수치해석이 복잡한 점토-파일 접촉면 상호작용 거동을 실제적으로 잘 모사할 수 있다고 판단된다.

• Journal of Animal Science and Technology
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• 제64권2호
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• pp.353-364
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• 2022

The present study aimed to assess the feasibility of increasing the slaughter weight (SW) of non-lean finishing pigs to improve their meat quality. A total of 36 (Landrace × Yorkshire) × Duroc gilts and barrows were slaughtered at 115 (Av), 125 (Hi), or 135 (XHi) kg, followed by physicochemical analyses and sensory evaluation on their longissimus dorsi (LD) and Semimembranosus (SM) muscles. Backfat thickness was greater (p < 0.05) for the XHi (31.2 mm) and Hi (29.3 mm) groups than for Av (25.0 mm). Dressing percentage and yield of the belly per whole carcass were also slightly greater for XHi and Hi vs. Av. The intramuscular fat (IMF) content of SM was greater for XHi (2.64%) than for Av (1.83%) and Hi (2.04%) and also was correlated with SW (r = 0.55). The pH value, lightness, redness, drip loss, shear force, and moisture and protein contents of LD and SM, as well as IMF content of LD, were unaffected by SW. Percentages of 14:0, 16:0, and total saturated fatty acids (FA) were less for Hi and XHi vs. Av in SM, those of total unsaturated FA, 18:2, 20:4, and n-6 being opposite; FA composition of LM was not influenced by SW except for a reduced 18:0 percentage for XHi vs. Av. The sensory score was less for XHi vs. Av for odor in fresh LD and SM, and less for Hi and XHi vs. Av for aroma in fresh LM; scores for color, drip loss, marbling, and acceptability were unaffected by SW. As for cooked muscles, none of the scores for color, aroma, flavor, juiciness, tenderness, and acceptability was affected by SW, except for a greater LD color score for Hi and XHi vs. Av. Collectively, the results suggested that the increased yield of the carcass and belly due to increased SW is outbalanced negatively by excessive backfat deposition in production efficiency, whereas the SW increase exerts little influence on overall sensory quality of fresh or cooked meat. Production of non-lean market pigs overweighing 115 kg therefore will be uneconomical unless consumers pay a substantial premium for the over-fattened pork.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(II)
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• pp.253-256
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• 2005

This paper is to investigate the mixture proportion, compressive strength and drying. shrinkage of concrete depending on mineral admixtures such as fly ash (FA), blast furnace slag (BS) and cement kiln dust (CKD) under various contents of admixtures. The use of CKD had little effect on strength development at 3 days, while the use of FA and BS lead to similar compressive strength compared with that of control concrete. Concrete with CKD exhibited a reduction of compressive strength at 91 days, meanwhile concrete with FA and BS had a increase compared with that of control concrete. Drying shrinkage of concrete depending on CKD and BS increase compared with that of control concrete about $10\∼20\%$, while the use of FA exhibited reduce compared with that of control concrete about $10\∼15\%$.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.707-710
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• 2005

This experimental study investigate temperature dependency affecting setting and strength development of concrete using mineral admixtures such as CKD, FA and BS. For the properties of setting at $5^{\circ}C$, setting time of concrete with mineral admixture was delayed about $3\~14$ hour compared with that of plain concrete. Use of CKD had a desirable effect on reducing setting retard under $5^{\circ}C$ because of $CaCO_3$ of CKD while use of FA and BS retarded setting time greatly. For compressive strength under $5^{\circ}C$, concrete with CKD had the most compressive strength in early age compared with the other mineral admixtures but exhibited slight strength loss in $-5^{\circ}C$ at 28days. Especially, concrete with FA and BS was observed in early stage at low curing temperature because of strength loss remarkably in $-5^{\circ}C$.

• 한국추진공학회지
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• 제14권1호
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• pp.65-78
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• 2010

DARPA는 항공 우주 분야에서 미국의 군사적 우위를 유지하기 위하여 다양한 극초음속 비행체 연구개발 프로그램을 진행하고 있다. DARPA의 극초음속 비행체 개발의 중심에는 HTV-1, HTV-2, HTV-3X를 거쳐 HCV로 진행되는 단계별 장기 계획을 포함하는 Falcon 프로그램이 있으며, 극초음속 항공기의추진기관인 TBCC 엔진 기술 연구 개발 프로그램인 HiSTED, FaCET, MoTr 및 Vulcan 프로그램을 진행하고 있다. 본 문건은 이들 프로그램의 배경 및 기술 요소 및 프로그램 사이의 관계 등에 정리한 것이다.