• Journal of Communications and Networks
• /
• 제13권5호
• /
• pp.442-448
• /
• 2011

It's a challenging task to design a high performance modulation for satellite and space communications due to the limited power and bandwidth resource. Constant envelope modulation is an attractive scheme to be used in such cases for their needlessness of input power back-off about 2~3 dB for avoidance of nonlinear distortion induced by high power amplifier. The envelope of Feher quadrature phase shift keying (FQPSK) has a least fluctuation of 0.18 dB (quasi constant envelope) and can be further improved. This paper improves FQPSK by defining a set of new waveform functions, which changes FQPSK to be a strictly constant envelope modulation. The performance of the FQPSK adopting new waveform is justified by analysis and simulation. The study results show that the novel FQPSK is immune to the impact of HPA and outperforms conventional FQPSK on bit error rate (BER) performance. The BER performance of this novel modulation is better than that of FQPSK by more than 0.5 dB at least and 2 dB at most.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
• /
• 제18권4호
• /
• pp.53-65
• /
• 2012

Purpose: With the increasing national interest in health, the number of health examination centers is growing rapidly, and it is growing as independent medical institutes separated from hospitals. With the growing functions and size of health examination institutes, considerations for testees, who are the most important users of the health examination centers, have taken the back seat. In particular, for health examination programs that take on a sequential traffic line, it is important to be aware of the space of each examination room, but the lack of a scientific evaluation method for this has resulted in great discomforts for testees using the health examination center. Method: Thus, this study proposes risk evaluation indices (RCF TCF, RC3, RR, ARR), and set a standard health examination program based on the national health examination program. This was applied to 11 different sized health examination centers to find their features, and together with identifying the trends of the indices, the following results were deduced. Result: 1) ARR showed a wide-range feature as the number of unit spaces increased, while RR were discovered regardless of the size, thus displaying local features. 2) The increase of ARR is affected more by internal factors in the health examination center than from outside factors. 3) By gender, when separating the basic health examination fields, the connective relation of the comprehensive health examination fields had a big effect on ARR. 4) By becoming larger, the fields of function become independent and the waiting space that results from it increases the number of total movement, so there is space for improvement in this.

• 수산해양기술연구
• /
• 제40권1호
• /
• pp.37-46
• /
• 2004

제주도 연안 정치망 조업 시스템 개량과 개발분야에서 연안해역에서 널리 사용되고 있는 각망어구의 구조개량을 위한 기초연구로서 현재 사용되고 있는 실물망을 1/20로 축소하여 개량된 입구 구조를 갖춘 모형 어구 8종류를 제작하고, 실험 수조에서 고등어 어군을 이용하여 모형 어구에 대한 어군의 입 ${\cdot}$ 출망 행동을 관찰 분석하였는데, 그 결과는 다음과 같다. 1. 원통그물내에서의 어군의 행동 패턴은 원형 모양으로 한쪽 원통그물내에 체류하는 행동과 긴 타원형 모양으로 좌 ${\cdot}$ 우 원통그물내를 왕복 유영하는 행동패턴으로 분류할 수 있었다. 2. 모형 어구 내에서의 고등어 어군의 평균 유영 속도는 원통 그물 중간 부분에서 24.9cm/sec, 오른쪽 원통그물내에서 12.6cm/sec, 입구에서 32.0cm/sec였다. 3. 어군의 입망율은 경과 시간 60초일 때 표준 모형 어구에서는 47%였고, 깔대기 그물이 길이가 35cm 의 모형 어구에서는 40%로 나타났는데, 양자의 차이는 7% 정도로 그다지 크지 않았다. 4. 어군의 출망율은 경과 시간 60초일 때 표준 모형 어구에서는 69%였고, 깔대기 그물의 길이가 35cm 의 모형 어구에서는 10%로 나타났는데, 양자의 차이는 59% 정도로 그 폭이 컸다. 5. 어군의 잔여율은 경과 시간 60초일 때 표준 모형 어구에서는 31%였고, 깔대기 그물의 길이가 35cm의 모형 어구에서는 90%로 나타났는데, 양자의 차이는 59% 정도였다.

• 한국정보과학회논문지:데이타베이스
• /
• 제34권5호
• /
• pp.420-436
• /
• 2007

지리정보시스템에서 빈번히 사용되는 공간 조인 연산자의 성능을 보장하기 위해서는 효율적인 색인 기법의 선택이 중요하며, 대표적인 색인 기법으로는 $R^*$-tree를 이용한 방법이 알려져 있다. 본 논문에서는 DOT(Double Transformation) 공간 색인을 이용한 효율적인 공간 조인 처리 기법을 제시하고 이를 $R^*$-tree를 이용한 공간 조인 처리 기법과 비교한다. DOT 공간 색인 기법은 공간 객체의 MBR 정보를 공간 순서화 곡선을 사용하여 하나의 1차원 값으로 변환한 후 그 값을 검색 키로 갖는 $B^+$-tree 색인 구조를 구성하는 방법으로서, 이를 이용하면 전통적인 데이타베이스의 주 색인을 적용할 수 있다는 중요한 특징을 가진다. 본 논문에서는 공간 객체의 MBR 정보를 하나의 1차원 값으로 변환하기 위해 사용되는 공간 순서화 곡선의 규칙성을 분석함으로써 공간 변환 연산의 횟수를 대폭 감소시킨 효율적인 DOT 색인기반의 공간 조인 알고리즘을 제안한다. 제안된 알고리즘에서는 반복적으로 수행되는 공간 변환 연산의 횟수를 줄이기 위하여 질의 영역을 공간 순서화 곡선이 연속 운행하는 가능한 최대 크기의 면적으로 분할하는 쿼터 분할 기법을 사용한다. 다양한 분포와 크기를 갖는 데이타 집합을 대상으로 $R^*$-tree를 이용한 공간 조인 처리 기법과의 비교 실험을 수행한 결과 최대 약 3배의 성능 이익을 얻을 수 있음을 확인할 수 있었다.

• 한국환경복원기술학회지
• /
• 제9권1호
• /
• pp.14-30
• /
• 2006

It is difficult to secure public lots in the downtown area, school lots can be made the best use of important source to increase the area of green land in the city. The tree-planting campaign for schools has been in force since 1999 by the city of Seoul and at present; it is currently established as the plan of school parks. Thereupon, the purpose of this study is to present some ways to revitalize elementary schools to be used as vest pocket parks through the research of elementary schools, which are subject to the plan of school parks in Seoul. The results of this study are as below : The subjects to revitalize school parks as vest pocket parks are as follows. First, the land has to be utilized for security of space. Second, in addition to the front and back gate, another passage to the park has to be set up for easy access. Third, the fence has to be formed as a hedge used outside the park. Fourth, selecting plants, species of trees suitable for the landscape of school and taking into consideration the aspect of ecology. Finally, it is urgent to enact socially and economically proper standard of law by the new standards of area for school landscape considering not only the building law and regulations of general landscape, but also specific characteristics of school landscape.

• 한국과학교육학회지
• /
• 제14권3호
• /
• pp.272-284
• /
• 1994

The aim of this research was to compare and analyze the children's ideas on evaporation and condensation between pre- and post-intervention. Forty-eight children from six elementary schools in Seoul and Kyung Ki provinces were sampled by stratified random sampling. A set of structured activities was then provided which allow children to explore evaporation and condensation phenomena. All of these activities had a preliminary phase which required the child to predict or speculate on evaporation and condensation using their existing knowledge. These structured activities on evaporation and condensation were reviewed by three professors and eigth primary school teachers. Their comments were used to revise the original contents of the structured activities. The data analysed were gathered by the questionaire and the interview. Pre- and post-intervention data related to evaporation and condensation were collected by the same teacher, and analysed into the same category scheme. Data coding was carried out several times by the researcher to ensure reliablity. Data collected were then classified and analyzed according to the types of children's ideas. The findings of this study were as follows: Results of this study showed that the the vocabulary used to describe the evaporation phenomena varied according to the context, and the scientific term "evaporated" was more frequently used by the older children after post-intervention. But everyday terms such as"dried up","disappered", "gone up" were also used by children as much as the level of pre-intervention. Scientific conception on the location of evaporated water, the factor of evaporation, the ideas about getting the water back and assumption about the physical state of the missing water has been increased for the most of the children after intervention. It was found that the intervention using was effective SPACE strategies regardless of the grade level of the children.

• 한국HCI학회:학술대회논문집
• /
• 한국HCI학회 2008년도 학술대회 2부
• /
• pp.405-410
• /
• 2008

There is always a rhythm in our language and speech. As soon as we speech out, even just simple words and voice we make are edited as various emotions and information. Through this process we succeed or fail in our communication, and it becomes a fun communication or a monotonous delivery. Even with the same music, impression of the play can be different according to each musician' s emotion and their understanding. We 'play' our language in the same way as that. However, I think, people are used to the variety, which is, in fact, the variation of a set format covered with hollow variety. People might have been living loosing or limiting their own creative way to express themselves by that hollow variety. SPACIAL POEM started from this point. This is a new type of 'real-time visual interaction' expressing our own creative narrative as real-time visual by playing a musical instrument which is an emotional human behavior. Producing many kinds of sound by playing musical instruments is the same behavior with which we express our emotions through. There are sensors on each hole on the surface of the musical instrument. When you play it, sensors recognize that you have covered the holes. All sensors are connected to a keyboard, which means your playing behavior becomes a typing action on the keyboard. And I programmed the visual of your words to spread out in a virtual 3D space when you play the musical instrument. The behavior when you blow the instrument, to make sounds, changes into the energy that makes you walk ahead continuously in a virtual space. I used a microphone sensor for this. After all by playing musical instrument, we get back the emotion we forgot so far, and my voice is expressed with my own visual language in virtual space.

• 한국디지털건축인테리어학회논문집
• /
• 제12권4호
• /
• pp.107-116
• /
• 2012

Planning a major change in the domestic residential complex 'complex' in the 'city' to the influx of urban space. So, considering a set of self-environmental complex of openness and connectivity between cities inflow from residential urban housing is formed. Complex-oriented development approach and apartment high-rise and high-density regions of space and social disconnection that causes a uniform methodology that can solve the problem of housing plan, however, a recent New Urbanism New Urbanism has been introduced. And intravenous forms of communal life that occurred in the United States prior to World War II, this value is based on the main form. Design reorganizes This modern lifestyle factors (such as housing, jobs, shopping, leisure space) to go back to the traditional lifestyles while Neotradiotional Planning exercise. New Urbanism in the late 20th century, some literature refers to a postmodern approach adopted in the field of urban planning, the specific case. Actually important feature of post-modernism in the New Urbanism has been expressed. Problem is very confusing, and the principles of New Urbanism, New Urbanism, even those who claim that have different social and design views. Therefore, this study explores the postmodern tendencies of the New Urbanism, and based on this, the possibilities for the development of new towns in Korea mainly affected on the theory of New Urbanism in South Korea in Eunpyeong examine.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
• /
• 제27권4호
• /
• pp.7-14
• /
• 2021

Purpose: This study summarized architectural planning data for clinical practice spaces for CPX/OSCE and Simulation spaces, through analysis of domestic and foreign literature and a survey of domestic colleges of medicine. Methods: This study analyzed the architectural planning elements of the clinical practice spaces of the college of medicine, through a literature review on the clinical practice space and the survey of four recently established colleges of medicine. Results: ① It is desirable to plan the floor plan type for Simulation and CPX/OSCE spaces as a corridor-separated type that separates the circulations between students and staff (faculty). ② The simulation area arranges their practice rooms around the control space where the circulation of the staff is made. Conversely, it is desirable to arrange the CPX/OSCE rooms around the test waiting room where students enter. ③ It is desirable to separate access to the staff and students to allow student control, and to install various support spaces facing the staff corridor to secure the movement of equipment and the flow of evaluators. ④ In the simulation area, the equipment stored in the storage must be set in each room before the practice according to the setting of delivery or surgery like, and the equipment that has been removed must be back, so the circulation is short and does not intersect with the student circulations. ⑤ Debriefing rooms, seminar rooms, etc. are arranged in the staff area for review and discussion of clinical situations where practice and evaluation have been completed. Implications: It is important to configure an appropriate movement system and spatial zoning for each space for simulation and CPX/OSCE.

• 한국방재학회:학술대회논문집
• /
• 한국방재학회 2011년도 정기 학술발표대회
• /
• pp.190-190
• /
• 2011

사회 다변화 및 급속한 경제성장과 도시밀집화로 인하여, 화재의 발생으로 인하여 막대한 인명피해 및 대규모의 재산상의 피해가 지속적으로 발생하고 있다. 이러한 화재의 피해를 예측하기 위해서는 실제 규모의 화재실험이 매우 유용하지만, 막대한 비용과 현실적 제약조건으로 인하여 실제 실험에는 많은 어려움이 따른다. 따라서 막대한 예산이 소요되는 실제규모의 화재실험의 대체방법으로 실제를 모사하는 축소모형 화재모의실험 및 컴퓨터를 이용한 화재 시뮬레이션 기법이 널리 이용되고 있다. 본 논문에서는 범용 컴퓨터를 이용한 화재 시뮬레이션 기법(CFAST)을 이용하여 수직 공간 구성을 가지는 단독주택의 화재 성상을 검토하였다. 시뮬레이션 모델로는 단독주택을 대상건물로 하여 2층으로 수직 공간을 가지는 단독주택 건물에 대한 모의 화재 시뮬레이션을 수행 하였다. 화재 시뮬레이션 결과는 각 구획실별 온도, 일산화탄소량, 공기 중 산소량 등을 도출하여 기존 이론에 의한 화재성장 그래프와 시뮬레이션 데이터를 비교하여 정확도를 검토하였다. 본 논문에서는 두가지의 시나리오를 작성하여 화재 시뮬레이션 프로그램의 결과 값을 분석하였다. (1) 시나리오 1 : 화재시뮬레이션 대상건물 1층 거실(2번방)에서 스프링클러 미 설치시 화재가 발생한 경우를 가정하여 수평방향인 3번방과 수직방향인 7번방의 화재 확산 피해정도를 살펴보고, 화재 그래프의 이론값과 실험값의 차이를 비교하여 그 정합성을 검토하였다. 발화물질은 Curtain, TV set, Sofa, Table으로 하며 시간은 60초 간격으로 총 3600초(1시간)를 분석 하였고, 발화지점의 온도, 일산화탄소, 공기중 산소 농도를 분석하였다. (2) 시나리오 2 : 시나리오 1과 동일한 화재발현 조건으로 스프링클러가 설치되어 있을 때 화재 발생 했을 경우, 수평방향인 3번방과 수직방향인 7번방의 화재 확산 피해를 시나리오 1과 비교 검토 하였다. 기존 이론에 의한 화재 성장 그래프와 이번 시뮬레이션 결과값을 토대로 만든 그래프 형태를 비교해보면 두 그래프의 형태가 비슷한 형태를 나타내어 Flash Over 현상과 Back Draft 현상이 이론값과 같은 경향을 나타내고 있음을 확인 할 수 있었다. 따라서, 본 논문에서 수행한 화재 시뮬레이션 기법으로 건축물의 실제 화재시의 피해정도를 예측하는 데 유용하게 활용될 것으로 판단된다.