• 인터넷정보학회논문지
• /
• 제2권3호
• /
• pp.27-36
• /
• 2001

Recently much attention has been paid for interference mitigation technique for the COMA system, since more capacity is available with same bandwidth. In this paper, we introduces a novel adaptive interference suppression techniques for the CDMA system with narrow band interference. The proposed interference rejection scheme employs the adaptive linear prediction techniques in the subband. In each subband, we can more easily find and cancel the narrow band signal as compared to the full band. Thus, the proposed interference rejection can be classified as another time-frequency techniques for the narrow band interference rejection(10). Computer simulation is conducted for the 3-G COMA system with IF band sampling techniques, yielding better interference rejection and bit error rate performance as compared to conventional one. Also, optimum filter is analyzed and from the analysis, it can be shown the subband prediction techniques can suppress narrow band interference more efficiently.

• 수산해양교육연구
• /
• 제27권3호
• /
• pp.656-671
• /
• 2015

The purpose of the present study is to examine relationships between disconnection and rejection schema, defense mechanism, and mental health in college students using structural equation modeling. The present study suggested a proposed model in which defense mechanism exerted a full mediating effect on the relation between disconnection and rejection schema and mental health. Goodness of fit tests were used to compare the proposed model against competing models. The subjects consisted of 304 college students. They completed the Young Schema Questionnaire(YSQ-SF), the Defense Style Questionnaire(DSQ), and the Mental Health Scale. The results showed that the second model had a better goodness of fit. Based on these findings, it is suggested that psychological interventions for mental health in college students should consider strategies to use more flexible and more adaptive defense mechanism style.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2001년도 하계종합학술대회 논문집(5)
• /
• pp.89-92
• /
• 2001

For the diagnosis of arrhythmia in the heart system, the QRS complex of ECG signals is used in many cases. The rejection of the noise in ECG signals is important to acquisition of exact QRS complex. This paper presents some experimental results about instantaneous bandwidth estimation and noise rejection of ECG signals with the purpose of rejection of the 60 Hz power noise and the motion artifacts such as EMG signals and contact noise. ECG signals corrupted by noise are cleaned by using the variable bandwidth filter. For the filtering of ECG signals with noise, the instantaneous bandwidth of the signals is estimated by analysis of time-frequency representation of ECG signal.

• Membrane and Water Treatment
• /
• 제3권2호
• /
• pp.77-98
• /
• 2012

A two-dimensional (2D) steady state numerical model of concentration polarisation (CP) phenomena in a membrane channel has been developed using the commercially available computational fluid dynamics (CFD) package CFX (Ansys, Inc., USA). The model incorporates the transmembrane pressure (TMP), axially variable permeate flux, variable diffusivity and viscosity, and osmotic pressure effects. The model has been verified against several benchmark analytical and empirical solutions from the membrane literature. Additionally, the model is able to predict the rejection of an arbitrary solute by the membrane using a pore model, given some basic knowledge of the geometry of the solute molecule or particle, and the membrane pore geometry. This allows for predictive design of membrane systems without experimental determination of the membrane rejection for the specified operating conditions. A demonstration of the model is presented against experimental results for two uncharged test compounds (sucrose and PEG1000) from the literature. The model will be extended to incorporate charge effects, transient simulations, three-dimensional (3D) geometry and turbulent effects in future work.

• 한국자동차공학회논문집
• /
• 제9권3호
• /
• pp.35-41
• /
• 2001

In recent applications, map controlled thermostat has been adapted to optimize engine cooling system and vehicle cooling system. First of all, this strategy is focused on improving fuel consumption rate and reducing emissions, especially unburned hydrocarbon. The object can be obtained through controlling engine metal temperature by varying engine coolant temperature with engine load and speed. To achieve this goal, it is necessary to understand the characteristics of engine metal temperature and heat rejection rate to coolant. From the results of tested engines, it is obvious that fuel consumption rate has more dominant effect on engine metal temperatures than the corresponding engine power does. Also, Re-Nu relation which shows heat rejection rate to coolant in function of air-fuel mixture and engine specifications has been studied. Also, the empirical Re-Nu relation at full loaded engine was developed.

• 가정과삶의질연구
• /
• 제29권6호
• /
• pp.1-8
• /
• 2011

This study examined the influences of parental acceptance-rejection, father involvement, and parental power-prestige in childhood on adult psychological maladjustment. Participants were 168 women. Stepwise regression results showed that father and mother's rejection in childhood were association with adult psychological maladjustment. However, both father involvement and parental power-prestige in childhood had no effects on adult psychological maladjustment.

• 대한핵의학회지
• /
• 제16권2호
• /
• pp.49-58
• /
• 1982

Renal transplant uptake of $^{99m}Tc-tin$ colloid was evaluated in 26 patients. Seventy-seven examinations were performed comparing transplant with bone marrow activity, clinical and/or pathological diagnosis. There were 13 instances of acute rejection; 7 of these exhibited slight uptake of radiocolloid in the renal transplant, 1 had marked uptake, and 5 had no evidence of uptake. There were 7 instances of chronic rejection; 5 of which demonstrated marked transplant uptake of radiocolloid, 1 had slight uptake, and 1 had no evidence of uptake. There were 2 instances of acute tubular necrosis and 55 instances of normal transplant function, but none of these exhibited transplant uptake of radiocolloid. From the result, the uptake of $^{99m}Tc-tin$ colloid by renal transplant appears to signal rejection as long. as the vascular supply is not severely compromised. Acute rejection may be represented by slight radiocolloid uptake, and chronic rejection by marked uptake when compared to bone marrow activity.

• 한국정보전자통신기술학회논문지
• /
• 제11권3호
• /
• pp.313-318
• /
• 2018

전자빔과 상호작용하는 공동공진기를 위한 동축형 대역억제필터를 설계하고 제작하였다. 제안한 필터는 공동공진기의 기본모드에 대해 4분의 1 파장 길이의 초크를 가진다. 동축형 대역억제필터의 등가회로를 제시하고 각 부분의 ABCD 파라미터를 구하여 필터 전체의 ABCD 행렬을 구했다. ABCD 행렬로부터 산란행렬을 구하여 MATLAB으로 필터를 시뮬레이션하였다. 동축형 대역억제필터 구조를 HFSS를 이용하여 시뮬레이션을 수행하여 등가회로로 시뮬레이션이 유용함을 확인하였다. 설계한 동축형 대역억제필터는 6-1/8 플랜지를 가지는 필터를 제작하였다. 제작한 필터는 6-1/8 플랜지에서 N 형 플랜지로 변환하는 변환기를 사용하여 측정하였다. 제작된 필터의 삽입손실은 공동공진기의 기본모드에서 25 dB 이상이고 1차 고차모드에서 0.25 dB 보다 작다. 측정측정 결과는 시뮬레이션한 결과와 잘 일치하며 설계 규격을 만족한다.

• 한국임상약학회지
• /
• 제16권1호
• /
• pp.14-22
• /
• 2006

Purpose: To determine the short (1 year of transplant) and long-term (1-5 years of transplantation) risk factors affecting the graft and patient survival in kidney transplantation recipients. Methods: Records of 149 patients who received kidney transplantation in 1996 from Asan Medical Center were followed for 5 years retrospectively. Results: All patients initiated triple immunosuppressive therapy with cyclosporine, prednisone and azathioprine. One, two, three, four, five year patient and graft survival rates were 98.7%, 98.0%, 98.0%, 97.3%, 97.3%, and 96.6%, 95.2%, 94.6%, 92.5%, 91.8%, respectively. There were 30 cases of acute rejection (AR) and 6 cases of chronic rejection (CR) within $2.1{\pm}3.2$ months and $42.1{\pm}13.2$ months of transplantation, respectively. The risk factors for AR were donor's age older than 30 years (p=0.02) and cardiovascular disease (p=0.05). The risk factors for CR were AR (p=0.0169) and episode of complications (p=0.0330). Increasing period of dialysis (p=0.0473), episodes of AR (p<0.0001) and complication (p=0.0317) were significant factors for graft loss. Seven grafts were lost from noncompliance during 1-5 year period. The most com- mon cause of the graft loss for both periods was the graft rejection. The graft survival rate was significantly lower in patients with than without rejection episodes (77.4% vs. 90.0%, p=0.002). Conclusions: Survival rate of the graft with rejection was significantly lower. The risk factors affecting AR were donor's age older than 30years and CVD. AR and episode of complications within 1year were the risk factors for CR and graft loss.

• 한국전자파학회논문지
• /
• 제17권12호
• /
• pp.1199-1205
• /
• 2006

본 논문은 두 개의 대역 저지 반파장 슬롯을 방사체에 삽입하여, 향상된 대역 저지 특성을 갖는 보우타이형 광대역 모노폴 안테나를 제안하였다. 제안된 안테나는 전자기적으로 급전된 보우타이 형태의 방사 평면과 접지면 사이에 반원 모양의 기생 접지면을 추가한 구조이다. 향상된 대역 저지 특성을 얻기 위하여 두 수평 슬롯간의 결합량을 조절하였다. 측정된 안테나는 $4.96{\sim}5.51GHz$에서 저지 특성을 갖고, $2.7{\sim}6.9GHz$에서 정재파비 2.0 이하를 만족하는 광대역 특성을 나타내었다. 단일 슬롯 사용과 비교하면, 넓은 저지 대역폭과 향상된 스커트 특성을 나타내었다. 측정된 안테나의 방사 패턴은 이상적인 모노폴 안테나와 유사한 특성을 가지며, 저지 대역에서의 안테나 이득은 다른 동작 주파수에 비해 x-z 평면을 기준으로 $5{\sim}10dB$ 이상 감소되었다.