2비트 시그마-델타 변조를 이용한 새로운 폴라 트랜스미터

임지연,전상훈,김경학,홍성철,김동욱,Lim, Ji-Youn,Cheon, Sang-Hoon,Kim, Kyeong-Hak,Hong, Song-Cheol,Kim, Dong-Wook 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.8

본 논문에서는 2비트 시그마-델타 변조기를 도입한 새로운 구조의 폴라 트랜스미터에 대해 논의한다. 제안된 구조에서는 2비트 시그마-델타 변조 방식을 도입하여 양자화 잡음을 낮추도록 하였다. 전력 증폭기는 2비트 디지털 처리된 진폭 신호를 받아들이기 위하여 2진법의 형태로 분할되도록 고안되었다. 새로운 구조의 폴라 트랜스미터를 EDGE 시스템에 적용하여 시뮬레이션 한 결과, 전체 전송 대역에서 스펙트럼 특성이 개선되는 것을 확인할 수 있었다. 2비트 변조기에 세밀한 양자화 방식을 적용함으로써 오버 샘플링 비가 2배 이상 증가한 정도의 잡음 감소 특성을 얻을 수 있었고 오버 샘플링 비를 증가시키지 않고도, 트랜스미터 출력 신호의 주파수 잡음을 10dB 이상 낮출 수 있었다. 또한, 전력 증폭기를 2진법으로 분할한 결과 다이나믹 영역이 5dB 정도까지 증가하는 효과를 얻었다. This paper presents a novel polar transmitter architecture with a 2-bit sigma-delta modulator. In the proposed architecture, the 2-bit sigma-delta modulator is introduced to suppress quantization noise of conventional sigma-delta modulator. The power amplifier configuration is also modified in a binary form to accommodate the 2-bit digitized envelope signal. The Ptolemy simulation results of the proposed structure show that the spectral property is greatly improved in full transmit band of EDGE system. The fine quantization scheme of the 2-bit modulator lowers the noise level by 10dB without increasing the over-sampling ratio, which may be obtained if the over-sampling ratio increases twofold. Dynamic range is also enhanced up to 5dB owing to the new form of the power amplifier in the transmitter.

세부 공정별 CO₂ 배출 분석 및 환경비용 원가배분을 위한 Activity-based LCA 모델의 도입 - 커튼월 공사를 중심으로 -

임지연,이준성,신승우,손정욱,Lim, Ji-Youn,Yi, June-Seong,Shin, Seung-Woo,Son, Jeong-Wook 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.4

지구 온난화의 주범인 온실가스 배출량을 규제하고자 하는 전 세계적인 기조에 따라 건설 분야에서도 이와 관련하여 다양한 노력이 시도되고 있다. 그 일례로 LCA (Life cycle Assessment) 방법론 도입을 통해 $CO_2$ 배출량을 정량적으로 측정하려는 연구가 활발하게 수행되고 있다. 그러나 일반 제조업에서 수행되고 있는 기존의 LCA 방법론은 다양한 자재의 투입과 복잡한 생산구조를 가지고 있는 건설업에 활용되기에는 많은 한계가 있다. 이에 본 연구는 보다 정확하고 세분화된 환경영향 평가를 도출할 수 있도록, 기존 LCA 방법론에 ABC원가관리방식을 도입한 Activity-based LCA 모델을 제안하였다. 이를 기반으로 대표적 온실가스인 $CO_2$의 주요 배출 Activity와 각각 배출량에 대한 정확한 예측이 가능하도록 하는 모델을 제시하였으며, 실제 시공 중인 건물의 커튼월 시스템 공정을 대상으로 하여 그 유용성을 검증하였다. As worldwide efforts to reduce global warming gases, the construction Industry is endeavoring to diminish carbon dioxides emissions. Especially, by introducing the LCA methodology to the industry, A variety of related studies to measure the emission of carbon dioxides have been conducted. However, when the conventional LCA methodology is applied to the construction projects, some limitations have been reported. To overcome the restrictions derived from the industry characteristics, this research suggested the Activity-based LCA model by applying the Activity-based Costing (ABC), which breaks down the whole life cycles into more detailed stages. By implementing the newly developed model, forecasting accuracy of $CO_2$ emission was elevated, and the critical control points on carbon dioxides were established. Through the case study of aluminium curtain-wall system, this research verified the usefulness of the Activity-based LCA.

공급업체 만족도 설문 분석에 근거한 중요 협업 비즈니스 요인 규명과 개선 우선순위 결정

임지연(Lim, Ji-Youn),이장희(Lee, Jang-Hee) 대한경영학회 2012 大韓經營學會誌 Vol.25 No.9

한국 근대 아동극 장르의 용어와 개념 고찰

임지연(Lim Ji-youn) 한국아동청소년문학학회 2009 아동청소년문학연구 Vol.- No.5

The purpose of this thesis is to examine the aspect of forming and practicing Korean children’s theater by analyzing the genre terminology and concept of children’s theater during the period of Japanese colonial era when children’s theater was formed and developed on a full-scale basis. In this thesis, the actual state of using Korean children’s theater genre terminology was first empirically studied, and the changes in the concept according to the times were examined. Since children’s theater is common name of both children’s theater as ‘literature’ and children’s theater as ‘performance’, both were placed in the scope of analysis. All accessible data such as children’s magazines and newspapers containing children’s theater works and criticism, textbooks, drama reviewer examined meticulously, if not thoroughgoing enough. It was after the 1910s when organization of theatrical troupes began to become an issue while children practiced new-school dramas that werepopular at that time that the genre term ‘adonggeuk’ instead of ‘yeongeuk’ began to be separately used. It was from the time when dramas that children, instead of adults, play, i.e. ‘children as performers’ were newly recognized. Afterwards, as children-oriented contents and forms of dramas gradually develop, the dramas begin to branch into the genre of children’s theater and new genre terminology begins to emerge. The aspects of using such terms have been varying subtly in each period. In other words, the use of the terms has changed depending on recognition of the factors for composing children’s theater such as performers, performing form, and contents. Up to the 1920s, diverse terms such as children’s play, nursery drama, lyric drama, fairy tale drama, children’s song drama, and maiden drama emerged and in the late 1920s, the use of common names of ‘donggeuk’, ‘adonggeuk’ began to be generalized. It is because full-fledged academic approaches to children’s theater such as organization of research institutions of children’s theater, and criticism of children’s theater began to be made. In the late 1930s, broadcast plays newly emerged. So far, researches on children’s theater have been made with consistent standards such as materials of work of art, themes, and forms, without examining the characteristics and concepts of the genre inherent to the times. So, in order to provide the more meticulous basis of researches on children’s theater, this study examined the trends of changes in the use and concepts of the terms of the children’s theater genre. After this, I will clarify the formal and historical characteristics of Korea children’s theater by more closely examining the characteristics of each genre.

건물에너지 소요량 산정 프로그램 활용 건축정보 데이터베이스 설계

임지연(Ji Youn Lim),이승언(Seung-eon Lee) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6

The Korean government announced its plan to raise the previous reduction goal of greenhouse gas emission from buildings by 26.9% until 2020 on July 2015. Therefore, policies regarding efficiency in the building energy are implemented fast, but the level of building owners and market understanding is low in general, and the government service system which supports decision making for implementing low-energy buildings has not been provided yet. The purpose of this study is to present the design direction for establishing user customized building energy database to perform a role to provide autonomous ecosystem of low-energy buildings. In this study, a measure to provide proper default using the level of data which general users with no expert knowledge regarding building energy could easily enter was suggested.

윤석중의 아동극 활동 고찰

임지연(Lim Ji-youn) 한국아동청소년문학학회 2010 아동청소년문학연구 Vol.- No.6

The purpose of this thesis is to study Yoon Seok-joong’s activities related to children’s theater. Yoon Seok-joong engaged in his literary activities with interest in more genres forseveral years in the early stage when he began his activities as a writer on a full scale than he did in any other time. Particularly, he was strong in cultural sentiments, curiosity about the products of new civilization, experiments on new genres, and critical consciousness about the Japanese imperialism. Yoon Seok-joong appeared to have attempted to put the contents of reality criticism in the genre of epic rather than in children’s songs. However, the existing researches have hardly dealt with the contents of Yoon Seok-joong’s activities related to children’s theater. Although there are not many works of Yoon Seok-joong’s children’s theater, he clearly left his footmarks on the modern children’s theater with his experiments on the modern genre of children’s theater, epic completeness, and realistic description of children. He had another tendency that was quite different from that he showed in other genres such as children’s song, children’s poem, and fairy tale. In it, the contents of reality criticism were described more concretely than in any other works. However, Yoon Seok-joong’s works of reality criticism have often been treated as ‘exceptional works simply pursuing tendencies.’ The aspects of conflict and the methods of solution shown in Yoon Seok-joong’s children’s theater are differentiated from the aspects of other works shown in proletariat children’s theater. To say that he ‘simply pursued tendencies’ is only a hasty judgment made without meticulous research on Yoon Seok-joong’s biographical facts and works. Yoon Seok-joong appears to have chosen the genre of ‘children’s theater’in order to convey critical consciousness of the colonial realities to the children. This is due to the expected value of the social and cultural role of children’s theater in the Japanese colonial era and the writer’s experiment on the epic genre. His attitude like this toward the children’s theater provides the room for reinterpreting the so-called ‘optimistic childlike innocence’ shown in the children’s songs in the same period.

Development of Building Energy Integrated Support System for the Spread of Low-energy Bulding

Lim Ji-Youn(임지연),Lee Seung-Eon(이승언),Kim Yu-min(김유민),Kim Chun-Hag(김천학) 한국태양에너지학회 2014 한국태양에너지학회 학술대회논문집 Vol.2014 No.11

지역 소득 수준에 따른 가정 부문 에너지 사용량 영향 분석

임지연(Lim, Ji Youn),이승언(Lee, Seung-Eon),김덕우(Kim, Deuk-Woo) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2

우발적 분변흡인후 발생한 급성호흡곤란증후군 1 례

임지연(Jee Youn Lim),윤재균(Jae Kyun Yoon),이광철(Kwang Chul Lee),정지태(Ji Tae Choung) 대한소아알레르기호흡기학회 1996 소아알레르기 및 호흡기학회지 Vol.6 No.2

Acute Respiratory Distress Syndrome (ARDS) is disease entity characterized by physical signs of pulmonary insufficiency, impairment in gas exchange, and impaired lung compliance, and radiographic findings of diffuse pulmonary infiltrates due to increased permeability of alveolar-capillary membrane. ARDS is associated with a variety of predisposing disorders. In spite of improved respiratory support and intensive care, but mortality rates is still high. We have experienced a case of ARDS in 34 months old girl after fecal material aspiration by accident. This is the report on her clinical and radiologic findings with brief review of literatures.

소아 천식 캠프 프로그램 개발을 위한 모델 제시

임지연(Jee Youn Lim),정지태(Ji Tae Choung) 대한소아알레르기호흡기학회(구 대한소아알레르기 및 호흡기학회) 1998 소아알레르기 및 호흡기학회지 Vol.8 No.2

목 적 : 천식은 소아 연령에서 가장 흔하게 나타나는 만성 질환으로 전세계뿐만 아니라 국내에서 높은 유병률을 보이며 소아 천식에 대한 이해와 약물 치료의 많은 발전에도 불구하고 이와 연관된 유병률 및 사망률 모두 증가하고 있다. 이러한 이유로 천식의 관리와 치료에 있어서 새로운 해결 방법으로 천식 교육 프로그램의 개발과 실행이 이루어지고 있으며 이와 연계하여 기존 천식 프로그램을 보완하는 시도들 중 하나인 천식 캠프 프로그램이 개발되었고 천식 아동들에서 긍정적인 평가를 받고있다. 이에 저자들은 우리 나라 현실에 맞는 소아 천식 캠프 프로그램을 개발하여 이를 통한 효과적인 천식 관리를 시도하고자 본 연구를 계획하였다. 방 법 : 본 캠프 프로그램은 기관지 천식으로 진단 받고 고려대학교 의과대학 부속병원 소아과 알레르기 클리닉에 다니는 천식 아동 중 희망자 20명을 대상으로 3박 4일 동안으로 계획하였다. 4일간의 일정동안 1일 50분씩 3시간의 천식 교육시간을 할애하였고 강의와 실습의 순서로 진행하였다. 이외의 시간은 정규 캠프와 유사한 일정으로 구성하였다. 캠프 기간동안 건강진단을 시행하였으며 참석자들이 스스로 자신의 상태를 평가하고 이에 대한 치료 계획을 세우도록 유도하였다. 결 과 : 천식 교육 프로그램의 내용은 1일차: 천식이란 무엇인가?, 2일차: 천식 치료는 어떻게 하는가?(호흡법 교육), 3일차: 천식 발작의 예방은 어떻게 하는가?로 구성하였으며 이외의 시간 동안에는 하이킹, 해수욕, 운동(농구 등), 장기 자랑과 캠프 파이어 등의 다양한 활동을 경험할 수 있도록 하였다. 결 론 : 만성 질환의 치료에 있어서 중요한 의사, 환자 및 보호자의 상호 협조를 강조한 천식 교육 프로그램을 바탕으로 한 천식 캠프 프로그램의 모델을 제시하는 바이며 이를 바탕으로 천식 아동들을 위한 캠프를 시행할 계획이며 추후에는 천식 캠프 프로그램의 효과에 대한 평가가 필요하리라 생각된다. 또한 여기서 얻어지는 경험을 통하여 천식 외의 다른 만성 질환의 캠프 프로그램 개발에 정보와 자료를 제공하여 만성 소아 질환 환자 관리에 기여하고자 한다. Purpose : Asthma prevalence, morbidity, and mortality have been increasing in the whole world in recent years, especially among children. The estimated prevalence of asthma among children in the United States has been increased by almost 40% from 1981 to 1988, making asthma a predominant cause of morbidity in childhood. Recognition of the continued significant social and economic impact of asthma has led the medical community to consider new management strategies emphasizing patient education. Educating asthmatic children about the disease can have demonstrable long-term benefits, including improved independence and compliance as well as better control of asthma symptoms. The specialized asthma summer camps were developed in the late 1960s to provide pleasant camping experiences for the children perceived to be too ill to participate in regular camps. Despite the usefulness and the need of the asthma camp programs, there are a few asthma camp programs developed in Korea. Methods : As an effort to develop the Korean camp programs for childhood asthma, this study proposes a model of 4-days-camp program for 20 patients who diagnosed as asthma. Results : This successful exercise the model will achieve better control of childhood asthma by leading the patients to participate actively in their asthma treatment. Conclusion : Further studies are needed to investigate empirically the positive effects of asthma education programs in camp settings in terms of asthma exacerbations and school day absences due to asthma.