• 파렛트 뉴스
• /
• 통권32호
• /
• pp.15-20
• /
• 2004

• 한국전자파학회논문지
• /
• 제21권6호
• /
• pp.681-689
• /
• 2010

본 논문에서는 분산 소자 형태의 마이너스 군지연 회로를 이용함으로써 피드포워드 증폭기의 효율 개선 및 구현의 용이성을 증대시킬 수 있는 새로운 구조의 피드포워드 증폭기를 제안한다. 피드포워드 증폭기의 지연 소자에 의한 삽입 손실은 심각한 시스템의 효율 저하를 유발한다. 일반적으로 이러한 손실을 줄이기 위하여 고출력 동축 케이블 또는 지연 선로 여파기를 사용하지만, 그러한 소자들의 삽입 손실조차도 무시할 수 없어서 피드포워드 증폭기의 제약 사항으로 작용한다. 제안하는 마이너스 군지연 회로를 이용함으로써 광대역 선형화를 위해 혼변조 왜곡 신호 상쇄 루프에 사용되는 지연 소자를 제거할 수 있다. 중심 주파수가 2.14 GHz인 WCDMA 하향 대역에서 -9 ns의 군지연, 0.2 dB의 삽입 손실, 그리고 30 MHz의 대역폭을 갖도록 제작된 2단 분산 소자 마이너스 군지연 회로를 이용하여 제작된 제안하는 구조의 피드포워드 증폭기는 평균 출력 전력이 44 dBm 일 때 -53.2 dBc의 인접 채널 누설비(Adjacent Channel Leakage Ratio: ACLR)를, 19.4 %의 전력 부가 효율(Power Added Efficiency: PAE)을 갖는 것으로 측정되었다.

• 한국수학교육학회지시리즈D:수학교육연구
• /
• 제19권2호
• /
• pp.117-139
• /
• 2015

For the purpose of determining neurophysiological mechanism of math anxiety, we conducted an EEG measurement for 22 sixth grade elementary students including 11 students with high math anxiety (HMA group), and 11 students with low math anxiety (LMA group). We found that in HMA group, delta wave was significantly generated from the right frontal lobe, and in LMA group, four paths are clearly connected while they perform math tasks (right inferior occipital gyrus ${\leftrightarrow}$ left superior parietal lobule /left middle frontal gyrus ${\leftrightarrow}$ left inferior parietal lobule /left middle frontal gyrus ${\leftrightarrow}$ right inferior parietal lobule / right middle frontal gyrus ${\leftrightarrow}$ right inferior parietal lobule). According to the above results we suggest that math anxiety is related to emotions associated with pain, reduces working memory and has a negative effect on math performance.

• 한국중재학회지:중재연구
• /
• 제18권2호
• /
• pp.3-31
• /
• 2008

At its thirty-ninth session(New York, 19 June - 7 July 2006), United Nations Commission on International Trade Law(hereinafter referred to as the Commission) agreed to give priority to the topic of revising the UNCITRAL Arbitration Rules. From the forty-fifth through the forty-seventh session, the Working Group checked various issues based on the draft revised version of the UNCITRAL Arbitration Rules prepared by the Secretariat. At its forty-eighth session, the Working Group is going to finish its first reading of articles 38 to 41 of the draft revised version of the UNCITRAL Arbitration Rules, and to commence its second reading of the draft revised version of UNCITRAL Arbitration Rules. Korea is keen on enticing foreign direct investment into its territory. From the 1960s, Korea has concluded more than 80 BITs. Korea is making efforts to conclude FTAs with its trading partners. As of January, 2008, 3 FTAs have taken into effect with respect to Korea. According to provisions on dispute settlement found in such BITs and FTAs involving Korea, the Rules can be chosen for Investor-State Arbitration. Furthermore, the Rules is followed by the arbitration rules for domestic and international arbitrations administered by the Korean Commercial Arbitration Board. If the Commission adopts the revised version of UNCITRAL Arbitration Rules, the Rules will be able to give impact on the arbitration law and practice around the world of arbitration. That is the reason why we should keep attention to the development of the deliberations of the Working Group.

• The Journal of Advanced Prosthodontics
• /
• 제9권6호
• /
• pp.463-469
• /
• 2017

PURPOSE. To evaluate the fit of a three-unit metal framework of fixed dental prostheses made by subtractive and additive manufacturing. MATERIALS AND METHODS. One master model of metal was fabricated. Twenty silicone impressions were made on the master die, working die of 10 poured with Type 4 stone, and working die of 10 made of scannable stone. Ten three-unit wax frameworks were fabricated by wax-up from Type IV working die. Stereolithography files of 10 three-unit frameworks were obtained using a model scanner and three-dimensional design software on a scannable working die. The three-unit wax framework was fabricated using subtractive manufacturing (SM) by applying the prepared stereolithography file, and the resin framework was fabricated by additive manufacturing (AM); both used metal alloy castings for metal frameworks. Marginal and internal gap were measured using silicone replica technique and digital microscope. Measurement data were analyzed by Kruskal-Wallis H test and Mann-Whitney U-test (${\alpha}=.05$). RESULTS. The lowest and highest gaps between premolar and molar margins were in the SM group and the AM group, respectively. There was a statistically significant difference in the marginal gap among the 3 groups (P<.001). In the marginal area where pontic was present, the largest gap was $149.39{\pm}42.30{\mu}m$ in the AM group, and the lowest gap was $24.40{\pm}11.92{\mu}m$ in the SM group. CONCLUSION. Three-unit metal frameworks made by subtractive manufacturing are clinically applicable. However, additive manufacturing requires more research to be applied clinically.

• 한국안광학회지
• /
• 제13권4호
• /
• pp.103-107
• /
• 2008

목적: 본 연구는 처음 근용 안경을 착용하고자 하는 노안을 대상으로 근용 가입도 검사를 하여 가입도와 나이, 성별, 직업군, 구면 도수, 난시 도수와의 상관관계를 평가하고자 하였다. 방법: 155명의 피검사자의 좌, 우안(310안)을 대상으로 비조절마비 자각적 굴절 검사 및 크로스 실린더를 이용한 근용 가입도 검사를 하였다. 결과: 최초 근용 가입도는 +0.75D에서 +1.75D까지 검사되었고, 43세 이전의 평균 가입도는 +1.06D, 44세~46세까지는 +1.08D, 47세~49세까지는 +1.23D, 50세 이상에서는 +1.46D이었다. 피검사자의 평균 연령은 47.6세, 남자 74명, 여자 81명이었고 근거리 직업군이 71명, 원거리 직업군이 83명이었다. 결론: 가입도는 나이, 직업군, 난시 도수와 높은 상관성을 나타내었다(p<0.05, p<0.05, p<0.05).

• 대한영상의학회지
• /
• 제84권6호
• /
• pp.1244-1256
• /
• 2023

전립선암에서 뼈는 가장 흔한 전이병소이며, 전립선암의 질병 상태를 파악하고 치료 반응을 평가하기 위해서는 전이성 골병변의 평가가 필수적이다. 거세 저항성 전립선암은 남성호르몬을 거세 수치로 떨어뜨렸음에도 불구하고 암이 진행하는 상태를 의미하며, 이 상태에서는 원격 전이가 빈번하게 발생한다. 거세 저항성 전립선암의 치료 반응을 객관적으로 평가하기 위해 뼈스캔을 기반으로 한 Prostate Cancer Working Group 3 (이하 PCWG3) 가이드라인이 발표되었으나 실제 이를 쉽게 숙지하여 적용하기에는 어려운 점이 있다. 본 종설에서 PCWG3 가이드라인에 준한 거세 저항성 전립선암의 뼈스캔 기반 골병변 반응 평가를 위한 구체적인 영상 획득 방법 및 치료 반응 평가법을 소개하고자 한다.

• Wind and Structures
• /
• 제8권4호
• /
• pp.295-307
• /
• 2005

The paper describes the work of the IAWE Working Group WBG - Reliability and Code Level, one of the International Codification Working Groups set up at ICWE10 in Copenhagen. The following topics are covered: sources of uncertainties in the design wind load, appropriate design target values for the exceedance probability of the design wind load for different structural classes with different consequences of a failure, yearly exceedance probability of the design wind speed and specification of the design aerodynamic coefficient for different design purposes. The recommendations from the working group are summarized at the end of the paper.

• 가정과삶의질연구
• /
• 제30권2호
• /
• pp.173-187
• /
• 2012

This qualitative case study focused on the activation plan of flexible work arrangements. We selected eight workers from a foreign affiliated firm that has various flexible work arrangements for in-depth interview and focus group interview. The workers were categorized into two groups; those who have experiences with flexible working and those who have needs for flexible working. We analyzed their condition of work-family life and experiences with flexible working. Through the focus group interview, we can find out the needs and suggestions about activation plans of flexible work arrangements.

• 한국실천공학교육학회논문지
• /
• 제3권1호
• /
• pp.110-118
• /
• 2011

This paper suggests a realistic, business engineers' model based on Coop projects run by regional universities or colleges, in which students must meet the guidelines for engineering design that ABEEK requires. Many of current activities such as Coop programs and Internships aimed for engineering majored-undergraduates have notled them either to a satisfactory level of business skill at entrepreneur side, or to their higher chance of employment opportunities. Under the circumstances like this, we need a revised version of Coop activities: for example, launching a project that will be fully supported intrust by both sides, and thus improving students' business skill while they are working on that project. We demonstrate in this study how students have greatly improved their business skill through a model project that was planned by a working group, was successfully carried out on real job positions, and many of the students in the working group were job-offered finally as this new model suggested.