• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2000년도 춘계학술대회
• /
• pp.77-86
• /
• 2000

This paper deals with the problem of determining the retailer's optimal price and order size under the condition of order-size-dependent delay in payments. It is assumed that the length of delay is a function of the retailer's total amount of purchase. The constant price elasticity demand function is adopted which is a decreasing function of retail price. Investigation of the properties of an optimal solution allows us to develop an algorithm whose validity is illustrated through an example problem.

• 대한건축학회논문집:구조계
• /
• 제33권12호
• /
• pp.71-80
• /
• 2017

The purpose of this study is to applied reinforcement method at the joint part of the sandwich panel. Becasue the joint part of the sandwich panel has a disadvantage that flame spreads fast inside steel plates in the event of fire, leading to a big fire rapidly. In this study, the combustion performance was measured through KS F ISO 13784-1 "Reaction-to-fire tests for sandwich panel building systems" according to the application of reinforcement method to prevent flame from being brought into the internal joint of the sandwich panel. For the reinforcement inside the panel, the tape produced using expanded graphite-based heat-expandable glass fiber was attached. As a result, it was confirmed that the prevention of flame from being brought into the internal joint could delay the flash over time and the collapse of the test specimen.

• 대한족부족관절학회지
• /
• 제21권4호
• /
• pp.151-155
• /
• 2017

Purpose: Reducing tenderness or pain on the ankle joint and improving the range of motion are thought to be possible using hyaluronate-based anti-adhesive agents. On the other hand, there are more aspects to be studied regarding the incidence of complications, such as resting pain, tenderness, and stiffness, after surgery. Therefore, the aim of this study was to prove the effectiveness of the agents after ankle fracture surgery. Materials and Methods: Patients, who underwent open reduction and internal fixation surgery due to ankle joint fractures from June 2015 to May 2016, were studied prospectively. Thirty patients of them received a $Guardix^{(R)}$ injection during their surgeries and were included in the injection group. The other 30 patients were included in the control group. Postoperatively, tenderness on the scar, a delay in wound healing, and the active range of motion were evaluated at 2, 6, and 12 weeks after surgery. Results: A significant difference in tenderness on the scar was observed 2 weeks after surgery. On the other hand, there was no significant difference at 6 and 12 weeks after the surgery. The agent-using group showed a 6.7% delay in wound healing and a 93.3% nondelaying. In the non-using group, the delay was 63.3%, while non-delay was 36.7% (p<0.001). The group that underwent $Guardix^{(R)}$ usage showed an effective result in the visual analogue scale, which was statistically significant (p<0.001). The result at 6 and 12 weeks after surgery showed a significant difference. Conclusion: Improvement was observed in the patients who underwent a $Guardix^{(R)}$ injection, regarding the range of motion, visual analog scale, and healing of the wound postoperatively.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제12권12호
• /
• pp.5860-5876
• /
• 2018

A single snapshot data can only provide limited amount of information so that the rank of covariance matrix is not full, which is not adopted to complete the parameter estimation directly using the traditional super-resolution method. Aiming at solving the problem, a joint time delay and angle estimation using matrix pencil method based on information reconstruction vector for orthogonal frequency division multiplexing (OFDM) signal is proposed. Firstly, according to the channel frequency response vector of each array element, the algorithm reconstructs the vector data with delay and angle parameter information from both frequency and space dimensions. Then the enhanced data matrix for the extended array element is constructed, and the parameter vector of time delay and angle is estimated by the two-dimensional matrix pencil (2D MP) algorithm. Finally, the joint estimation of two-dimensional parameters is accomplished by the parameter pairing. The algorithm does not need a pseudo-spectral peak search, and the location of the target can be determined only by a single receiver, which can reduce the overhead of the positioning system. The theoretical analysis and simulation results show that the estimation accuracy of the proposed method in a single snapshot and low signal-to-noise ratio environment is much higher than that of Root Multiple Signal Classification algorithm (Root-MUSIC), and this method also achieves the higher estimation performance and efficiency with lower complexity cost compared to the one-dimensional matrix pencil algorithm.

• 융합신호처리학회논문지
• /
• 제14권2호
• /
• pp.136-146
• /
• 2013

본 논문에서는 FX 형식의 한일상관기(Korea-Japan Joint VLBI Correlator, KJJVC)의 잔차 지연 보정 알고리즘을 제안하였다. KJJVC의 초기 잔차 지연보정 알고리즘에는 연산의 고속화를 위해 정수 연산과 위상보정 계수를 위한 cos/sin table을 도입하였다. 그리고 잔차 지연 알고리즘의 초기설계에서 데이터의 타이밍과 잔차 지연 위상의 불일치와 비트쉬프트와 잔차 지연 위상의 불일치 문제를 해결하였다. VCS의 잔차 지연 알고리즘의 최종 설계에서는 잔차 지연보정된 값을 FFT segment에 적용할 때 잔차 지연 보정 회전 메모리가 초기화 되지 않는 것을 수정하였다. 제안한 잔치 지연 보정 알고리즘을 이용하여, 교차 전력 스펙트럼의 대역폭 모양이 모든 대역폭에 대해서 손실이 없이 평탄한 것을 확인하였다. 제안한 잔차 지연보정 알고리즘의 유효성을 확인하기 위해 시뮬레이터와 KJJVC를 이용하여 실제 관측데이터를 대상으로 상관처리 시험을 수행하였다. 실험결과를 통하여 제안한 잔차 지연 보정 알고리즘이 KJJVC에 잘 적용되고 있으며, 신호대 잡음비가 약 8% 향상되는 것을 확인하였다.

• 대한족부족관절학회지
• /
• 제6권2호
• /
• pp.211-216
• /
• 2002

Delay in diagnosis is possible in bone tumor located in the foot because it is rare. We experienced one case of osteoid osteoma located at the navicular bone of the foot which was slowly progressive and complicated with calcaneocuboidal joint, talonavicular joint arthritis. Osteoid osteoma of the navicular bone in the foot is rare. It bring about unwanted delay in diagnosis, complication. It is necessary to diagnose and treat in early situation to prevent complication and unnecessary operation.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제5권9호
• /
• pp.1573-1595
• /
• 2011

In this paper, the outage performance of multiuser multiple-input single-output (MISO) systems exploiting joint spatial and multiuser diversities is investigated for Rayleigh fading channels with outdated feedback. First, we derive closed-form exact outage probabilities for the joint diversity schemes that combine user scheduling with different spatial diversity techniques, including: 1) transmit maximum-ratio combining (TMRC); 2) transmit antenna selection (TAS); and 3) orthogonal space-time block coding (OSTBC). Then the asymptotic outage probabilities are analyzed to gain more insights into the effect of feedback delay. It is observed that with outdated feedback, the asymptotic diversity order of the multiuser OSTBC (M-OSTBC) scheme is equal to the number of transmit antennas at the base station, while that of the multiuser TMRC (M-TMRC) and the multiuser TAS (M-TAS) schemes reduce to one. Further by comparing the asymptotic outage probabilities, it is found that the M-TMRC scheme outperforms the M-TAS scheme, and the M-OSTBC scheme can perform best in the outage regime of practical interest when the feedback delay is large. Theoretical analysis is verified by simulation results.

• 한국멀티미디어학회논문지
• /
• 제18권2호
• /
• pp.168-177
• /
• 2015

To increase the overall utility and decrease the link delay and power consumption, a joint optimal cross-layer design of congestion control at the transport layer, link delay at the data link layer and power allocation at the physical layer for mobile ad hoc networks is considered in this paper. As opposed to previous work, the rate outage probability in this work is based on exactly closed-form; therefore, the proposed method can guarantee the globally optimal solutions to the underlying problem. The non-convex formulated problem is transformed into a convex one, which is solved by exploiting the duality technique. Finally, simulation results verify that our proposal achieves considerable benefits over the existing method.

• 한국BIM학회 논문집
• /
• 제12권4호
• /
• pp.32-40
• /
• 2022

The block-unit housing renewal project was presented as an alternative method to overcome the side effects of large-scale renewal projects while improving poor residential conditions. However, projects implementation is prolonged and even the pace of projects, which was considered an various incentives, is being delayed for the most part. In this study, delay factors are drawn by eight; conflict among association members, contract delay of joint implementation, participation paucity of constructor, inadequate project guidelines, alteration of project plan, lack of renewal project professionals, stricter loan restriction of HUG, lack of capacity of project operator. We categorized those eight factors to three aspects such as implementation, participants and proposition and suggested improvement alternatives according to three aspects.

• 한국도로학회논문집
• /
• 제12권4호
• /
• pp.29-37
• /
• 2010

이 논문은 회전교차로 우회전 별도차로를 다루고 있다. 본 연구의 목적은 회전교차로 기하구조의 설계요소 중 우회전 별도차로의 설치에 따른 효과를 분석하는데 있다. 이를 위해 VISSIM을 이용하여 우회전 별도차로의 설치 전 후를 비교 분석하였다. 또한 우회전 별도차로 설치 방식인 양보에 의한 통제 형태와 합류에 의한 통제 형태의 운영효과를 비교 분석하였다. 주요 결과는 다음과 같다. 첫째, 우회전 별도차로 설치 후에는 우회전 교통량비의 증가에 따라 지체가 점차적으로 감소하여 최대 평균 약 28% 감소하는 것으로 나타났다. 둘째, 양보에 의한 통제 형태와 합류에 의한 통제 형태 모두 우회전 교통량이 증가할수록 지체가 감소하였다. 또한 합류에 의한 통제 형태가 양보에 의한 통제 형태보다 최대 평균 약 18% 지체감소 효율이 있는 것으로 나타났다.