이중공진 이중편파 마이크로스트립 안테나

김연정,윤완석,윤영중 延世大學校 電波通信共同硏究所 1999 電波通信論文誌 Vol.4 No.1

본 논문에서는 Ku-band 위성통신 송수신 겸용 안테나를 위해서 500 ㎒이상의 대역폭과 송·수신부가 서로 다른 선형편파를 가지는 이중급전 구조의 이중공진 안테나를 연구하였다. 이때 상대 급전선에 의한 임피던스의 변화를 최소화시켜 최적의 안테나를 설계하였으며, 배열 안테나로 확장시 이중급전 구조의 문제점인 공간상의 문제를 해결하기 위해서 마이크로스트립 선로와 via-hole 혼합급전 방식을 사용하였다. 제안된 안테나를 이차원의 2X2 배열 마이크로스트립 안테나로 설계 및 제작하였고, 방사패턴과 주파수특성을 측정하여 위성통신 송수신 겸용 안테나로 잘 동작할 수 있음을 확인하였다. In this paper, to transmit and receive the differently polarized signals simultaneously with a single antenna system, the dual-frequency microstrip array antenna with dual-polarization is proposed and designed. This antenna operates simultaneously at 14.25 ㎓ and 12.50 ㎓ with the bandwidth above 500㎒. To extend to two dimensional array, microstrip feed line and coaxial probe through via-hole are used.

불안정 지지면을 이용한 운동 프로그램이 뇌졸중 환자의 균형에 미치는 효과

이지연,김용수,김진섭,박진현,최윤희,전덕훈,김경 대구대학교 특수교육재활과학연구소 2010 再活科學硏究 Vol.28 No.1

본 연구의 목적은 뇌졸중 환자의 재활을 위하여 불안정 지지면을 이용한 운동 프로그램이 균형 능력과 운동 기능 능력에 미치는 효과를 알아보고자 실시하였다. 불안정 지지면의 이용한 치료는 임상적으로 뇌졸중으로 인한 편마비 환자뿐만 아니라 스포츠 손상 및 노인들의 질환 등 다양한 병인을 가진 환자들의 치료에 이용되고 있다. 대부분의 뇌졸중 환자들은 재활 훈련을 할 수 있는 병원이나 기관에서 치료를 받을 때에 지지면의 차이를 제공함으로써 보다 더 안정한 지지면에서 적응할 수 있는 방법이 요구되고 있다. 하지만, 아직도 불안정 지지면을 이용한 구체화된 치료적 운동 방법과 객관적 평가에 대한 연구가 미비한 실정이다. 이러한 문제점을 해결하기 위하여 최근 뇌졸중 환자의 불안정 지지면과 이론적 근거를 바탕으로 한 운동 프로그램에 대한 연구가 더욱 필요하다. 본 연구에서는 실험군과 대조군이 같은 운동 프로그램을 적용하였을 때, 두 그룹 간에서 나타나는 균형 향상과 운동 기능 향상에 어떠한 효과를 주는지 살펴보고자 하였다. The purpose of this article was to study the effect of the exercise programme that uses the unstable supporting surface to rehabilitate cerebrovascular patients on balance ability and exercise function ability. The therapy is being clinically used for the patients with diverse pathological factors such as hemiplegia caused by CVA, sports injury, and diseases in the elderly. when most patients with CVA are treated in the hospital or institute that can provide rehabilitation training, they need to be given the way to adjust more stable surpporting surface by being provide with various stages of surface. However, the actual therapeutic exercises is still needed and the study for objective assessments wants conducting. To solve these problems, the study of unstable surface exercise programmes based on the evidences recently need to be made for the patients with CVA. in this study, we intend to look into what effects on the balance improvement and the exercise function are different from the experimental group to the control group with the same programme applied to the two groups.

경상남도 체육공원의 활성화 방안에 관한 연구 : 창원, 마산, 진해, 김해지역을 중심으로

조영규,오윤경,김연희 창원대학교 체육과학연구소 2003 경남 체육연구 Vol.8 No.2

본 연구는 최근 생활체육의 장으로 널리 활용되고 있는 도내 체육공원의 현황을 파악하고 시설에 대한 미비점과 문제점, 시설이용에 대한 애로점, 시민들의 요망사항 등을 고려하여 체육공원 이용 활성화 방안을 알아보기 위한 것이다. 이를 위하여 창원·마산·진해·김해 지역의 체육공원 중 다양한 계층이 고르게 사용하고 있는 13곳의 체육공원을 선정하여 직접 현장에 가서 현황을 파악하였으며 또한 일반 시민을 대상으로 설문조사를 실시하였다. 이러한 내용을 조사·분석한 결과 다음과 같은 결론을 얻을 수 있었다. 1. 체육공원에 대한 행정관청 주도의 적극적은 홍보가 필요하다. 2. 체육공원 설치시 그 지역의 이용지를 예상하여 체육공원을 설계하여야 한다. 3. 연령이나 남·녀, 개인 및 집단, 환경 등을 고려하여 위치를 선정하고 다양한 사용자에 대하여 개인적으로 운동욕구나 흥미를 줄 수 있는 운동기구의 설치 및 확충이 요구된다. 4. 운동기구의 정확한 명칭, 운동요령, 운동효과, 체력기준표의 설치가 필요하며 설치 후 세심한 관리가 요구된다. 5. 운동효과를 극대화하기 위한 운동기구의 배치가 요구된다. 6. 화장실, 음수대(세면대), 차양막, 담소장소 등 부대시설의 확충이 요구된다. 7. 학교, 직장체육시설, 아파트 단지 내 소규모 체육공원의 설치와 필요할 경우 사설 시설과 연계할 수 있는 방법을 모색하여야 한다.

요통환자의 요부 안정화 운동 방법이 통증감소에 미치는 효과에 대한 연구

조미숙,최윤희,김경,이지연,김진섭 대구대학교 특수교육재활과학연구소 2010 再活科學硏究 Vol.28 No.1

요통이란 근 골격의 이상으로 인한 통증으로 흉추 10번 이하의 허리부위에서 통증이 3일 이상 지속되는 경우를 말하며 인구의 약80% 이상이 일생을 통해 적어도 한번쯤은 겪게 된다. 이러한 요통은 체간의 연부조직의 손상이나 근력의 약화가 주요원인으로 작용하며, 이로 인해 통증, 지구력 감소, 관절가동범위 제한, 보행능력 감소를 유발한다. 이는 요통과 운동이 많은 관련성을 가지고 있다고 사료되며 그 중 요부 안정화 운동이 요통 환자의 통증 감소에 미치는 효과에 대해 선행연구들을 살펴봄으로써 효과적인 요부 안정화 운동방법과 적용에 도움을 주고자한다. Damage of soft tissue in lumbar interbody and weakness of muscular strength are the major causes of lower back pain, which results in inducing pain sensation, reducing muscular endurance and flexibility, limiting range of motion, and lowering locomotive capacity. Lower back pain is considered to be closely related to exercise. Exercise intervention in patients with low back pain being used as one of the spinal stabilization exercises and low back pain patients that exercise is effective in reducing the pain has been reported. Therefore, patients with low back pain of spinal stabilization exercises for pain reduction, previous studies on the effect of spinal stabilization exercise by examining how effective and will give help to apply.

Genomic landscape of multiple Bowen’s disease by whole-exome sequencing

( Yoon-seob Kim ),( Gyeong Sin Park ),( Eun Hee Yoo ),( Hae Eun Park ),( Je Hee Han ),( Yeong Ho Kim ),( Ji Hyun Lee ),( Chul Hwan Bang ),( Yeun-jun Chung ) 대한피부과학회 2022 대한피부과학회 학술발표대회집 Vol.74 No.1

Second-line Sonazoid-enhanced ultrasonography for Liver Imaging Reporting and Data System category 3 and 4 on gadoxetate-enhanced magnetic resonance imaging

Kim Yeun-Yoon,Min Ji Hye,황정아,정우경,Sinn Dong Hyun,임효근 대한초음파의학회 2022 ULTRASONOGRAPHY Vol.41 No.3

Purpose: This study investigated the utility of second-line contrast-enhanced ultrasonography (CEUS) using Sonazoid in Liver Imaging Reporting and Data System category 3 (LR-3) and 4 (LR-4) observations on gadoxetate-enhanced magnetic resonance imaging (MRI).Methods: This retrospective study included LR-3 or LR-4 observations on gadoxetate-enhanced MRI subsequently evaluated with CEUS from 2013 to 2017. The presence of MRI features, CEUSarterial phase hyperenhancement (CEUS-APHE), and Kupffer phase defect (KPD) was evaluated. Multivariable logistic regression analysis was performed to identify significant imaging features associated with the diagnosis of hepatocellular carcinoma (HCC). The optimal diagnostic criteria were investigated using the McNemar test.Results: In total, 104 patients with 104 observations (63 HCCs) were included. The presence of both CEUS-APHE and KPD on CEUS enabled the additional detection of 42.3% (11/26) of LR-3 HCCs and 78.4% (29/37) of LR-4 HCCs. Transitional phase (TP) hypointensity (adjusted odds ratio [OR], 10.59; P<0.001), restricted diffusion (adjusted OR, 7.55; P=0.004), and KPD (adjusted OR, 7.16; P=0.003) were significant imaging features for HCC diagnosis. The presence of at least two significant imaging features was optimal for HCC diagnosis (sensitivity, specificity, and accuracy: 88.9%, 78.1%, and 84.6%, respectively), with significantly higher sensitivity than the presence of both CEUS-APHE and KPD (sensitivity, specificity, and accuracy: 63.5% [P=0.001], 92.7% [P=0.077], and 75.0% [P=0.089], respectively).Conclusion: The combined interpretation of gadoxetate-enhanced MRI and second-line CEUS using Sonazoid, focusing on TP hypointensity, restricted diffusion, and KPD, may be optimal for further characterizing LR-3 and LR-4 observations.

Genomic comparison between in vitro three-dimensional culture model of melanoma and matched patient tumor

( Yoon-seob Kim ),( Minji Park ),( Songwan Jin ),( Yeun-jun Chung ),( Eun Hee Yoo ),( Hae Eun Park ),( Seung Ah Yoo ),( Yeong Ho Kim ),( Ji Hyun Lee ),( Chul Hwan Bang ) 대한피부과학회 2022 대한피부과학회 학술발표대회집 Vol.74 No.1

Whole-exome sequencing of three cases with basal cell carcinoma arising from sebaceous nevus revealed additional genomic alterations besides HRAS mutations

( Yoon-seob Kim ),( Joo Ho Jeong ),( Tae Keun Kim ),( Hyun Joon Chang ),( Ji Hyun Lee ),( Yeun-jun Chung ),( Gyeong Sin Park ),( Chul Jong Park ),( Kyung Ho Lee ) 대한피부과학회 2023 대한피부과학회 학술발표대회집 Vol.74 No.2

Association Between Oral Health and Airflow Limitation: Analysis Using a Nationwide Survey in Korea

Kim Sun-Hyung,Gu Seonhye,Kim Jung-Ae,Im YoHan,Cho Jun Yeun,Kim Youlim,Shin Yoon Mi,Kim Eung-Gook,Lee Ki Man,Choe Kang Hyeon,Lee Hyun,Yang Bumhee 대한의학회 2023 Journal of Korean medical science Vol.38 No.31

Background: Although poor oral health is a common comorbidity in individuals with airflow limitation (AFL), few studies have comprehensively evaluated this association. Furthermore, the association between oral health and the severity of AFL has not been well elucidated. Methods: Using a population-based nationwide survey, we classified individuals according to the presence or absence of AFL defined as pre-bronchodilator forced expiratory volume in 1 second/forced vital capacity < 0.7. Using multivariable logistic regression analyses, we evaluated the association between AFL severity and the number of remaining teeth; the presence of periodontitis; the Decayed, Missing, and Filled Teeth (DMFT) index; and denture wearing. Results: Among the 31,839 participants, 14% had AFL. Compared with the control group, the AFL group had a higher proportion of periodontitis (88.8% vs. 79.4%), complete denture (6.2% vs. 1.6%), and high DMFT index (37.3% vs. 27.8%) (P < 0.001 for all). In multivariable analyses, denture status: removable partial denture (adjusted odds ratio [aOR], 1.12; 95% confidence interval [95% CI], 1.04–1.20) and complete denture (aOR, 1.52; 95% CI, 1.01– 2.05), high DMFT index (aOR, 1.13; 95% CI, 1.02–1.24), and fewer permanent teeth (0–19; aOR, 1.32; 95% CI, 1.12–1.52) were significantly associated with AFL. Furthermore, those with severe to very severe AFL had a significantly higher proportion of complete denture (aOR, 2.41; 95% CI, 1.11–3.71) and fewer remaining teeth (0–19; aOR, 2.29; 95% CI, 1.57–3.01). Conclusion: Denture wearing, high DMFT index, and fewer permanent teeth are significantly associated with AFL. Furthermore, a reduced number of permanent teeth (0–19) was significantly related to the severity of AFL. Therefore, physicians should pay attention to oral health in managing patients with AFL, such as chronic obstructive pulmonary disease.

Intraindividual Comparison of Hepatocellular Carcinoma Washout between MRIs with Hepatobiliary and Extracellular Contrast Agents

Kim Yeun-Yoon,Kim Young Kon,Min Ji Hye,Cha Dong Ik,Kim Jong Man,Choi Gyu Seong,Ahn Soohyun 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.5

Objective: To intraindividually compare hepatocellular carcinoma (HCC) washout between MRIs using hepatobiliary agent (HBA) and extracellular agent (ECA). Materials and Methods: This study included 114 prospectively enrolled patients with chronic liver disease (mean age, 55 ± 9 years; 94 men) who underwent both HBA-MRI and ECA-MRI before surgical resection for HCC between November 2016 and May 2019. For 114 HCCs, the lesion-to-liver visual signal intensity ratio (SIR) using a 5-point scale (-2 to +2) was evaluated in each phase. Washout was defined as negative visual SIR with temporal reduction of visual SIR from the arterial phase. Illusional washout (IW) was defined as a visual SIR of 0 with an enhancing capsule. The frequency of washout and MRI sensitivity for HCC using LR-5 or its modifications were compared between HBA-MRI and ECA-MRI. Subgroup analysis was performed according to lesion size (< 20 mm or ≥ 20 mm). Results: The frequency of portal venous phase (PP) washout with HBA-MRI was comparable to that of delayed phase (DP) washout with ECA-MRI (77.2% [88/114] vs. 68.4% [78/114]; p = 0.134). The frequencies were also comparable when IW was allowed (79.8% [91/114] for HBA-MRI vs. 81.6% [93/114] for ECA-MRI; p = 0.845). The sensitivities for HCC of LR-5 (using PP or DP washout) were comparable between HBA-MRI and ECA-MRI (78.1% [89/114] vs. 73.7% [84/114]; p = 0.458). In HCCs < 20 mm, the sensitivity of LR-5 was higher on HBA-MRI than on ECA-MRI (70.8% [34/48] vs. 50.0% [24/48]; p = 0.034). The sensitivity was similar to each other if IW was added to LR-5 (72.9% [35/48] for HBA-MRI vs. 70.8% [34/48] for ECA-MRI; p > 0.999). Conclusion: Extracellular phase washout for HCC diagnosis was comparable between MRIs with both contrast agents, except for tumors < 20 mm. Adding IW could improve the sensitivity for HCC on ECA-MRI in tumors < 20 mm.