• 한국통신학회논문지
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• 제21권12호
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• pp.3215-3226
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• 1996

In this paper a K-band harmonic oscillator competitive to ordinary Push-Push type oscillators is introduced. This oscillator is composed of two-X-band dielectric resonance circuits. To favor its harmonic generation, the load effect and the bias effect are studied to allow the maximum harmonic distortion. As results, the dielectric resonated load and the class A bias are used for the 2nd harmonic generation. analytical study for modelling of voltage controlled dielectric resonator is carried out with theoretical background. The performance of the circuit is evaluated by simulation using harmonic balanced method. The novel structure has ont only a voltage tuning circuit but also an output port at fundamental frequency as the function of prescaler for phase lockede loop application on the just single oscillation structure. In experimentation, the output freqneyc of the 2nd harmonic signal is 20.5GHz and the maximum power level of output is +5.5dBm without additional post amplifiers. the harmonic oscillator exhibits -30dBc of high fundamental frequency rejection without added extra filters. The phase noise of -90dBc/Hz at 100kHz off-carrier has been achieved under free running condition, that satisfies phase noise requirement of IESS 308. The proposed oscillator may be utilized as the clean and stable fixed local oscillator in Transmit Block Upconvertor(TBU) or Low oise Block downconvertor(LNB) for K/Ka-band digital communications and satellite broadcastings.

• Asian Pacific Journal of Cancer Prevention
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• 제17권7호
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• pp.3615-3617
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• 2016

Background: Breast cancer molecular analysis by linkage analysis has the advantage of facilitating early diagnosis in asymptomatic genetic carriers, with a view to the preventive follow-up of these subjects and genetic counseling. The aim of this study was to evaluate BRCA1 gene D17S855 and D17S1322 markers in breast cancer patients. Materials and Methods: A series of 85 BC patients and 85 unrelated healthy women were recruited for haplotype analysis performed using two short tandem repeat markers located within the BRCA1 gene locus. Each marker was amplified with PCR genomic DNA from each individual and fluorescently end-labeled primers. Results: Both D17S855 and D17S1322 markers included 12 kinds of alleles. Results indicate that most of the BC patients shared two common 121-150 (11.2%, RR=1.56 and p=0.02) and 121-146 (5.6%, RR=1.9 and p=0.02) haplotypes. Conclusions: Our results should be helpful to understand the haplotype phase in the BRCA1 gene and establish a genetic screening strategy in the Iranian population.

• 한국전자파학회논문지
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• 제12권3호
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• pp.462-469
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• 2001

본 논문에서는 저주파 잡음이 상향변환 이득 해석을 이용한 K 밴드 국부발진기를 설계 및 제작하였다. 상향 변환 이득을 해석하고, 그에 따른 위상잡음을 예측하기 위하여 Two Signal Method(TSM)을 확장하였다. 제시된 이론의 유용성을 검증하기 위해 저 상향변환 이득을 갖는 회로의 동작점을 선택하여 free-running 발진기를 설계하였다. 측정결과 발진주파수는 23.42 GHz였고, 위상잡음은 1MHz offset에서 -105.2 dBc/Hz로 우수한 특성을 보였다. 그리고 같은 회로를 부고조파로 주입시켜 부고조파 주입동기 발진기로 동작시켰으며, 이 경우에도 낮은 부고조파 입력 파워에서 이상적인 체배기의 위상잡음 특성을 보였다.

• 한국전자파학회논문지
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• 제12권1호
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• pp.99-106
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• 2001

본 논문에서는 선형화 특성이 우수하고, 대역폭이 넓은 feedforward 선형화 기법을 이용하여 IMT-2000용 1-Watt 급 증폭기를 설계 제작하였다. Feedforward는 외부환경(온도, 입력 전력 레벨, 시간 등)의 변화에 민감하므로 마이크로컨트롤러를 이용하여 이를 제어하였다. 35dB 의 이득과 40dBm의 최고전력을 갖는 주증폭기를 설계하였고, 각 루프의 신호를 상쇄하기 위해서 반사형 가변감쇄기와 위상변화기를 사용하였다. 2.11 2.17GHz 대역에서 측정 결과 신호루프에서 주신호를 35dB이상 상쇄하였으며, 오차루프에서 30dB 이상 오차신호를 상쇄하여 60dBc 이상의 선형화 특성을 얻을 수 있었다.

• 한국통신학회논문지
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• 제28권12A호
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• pp.1019-1024
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• 2003

본 논문에서는 주파수 체배기를 이용하여 2차, 3차 고조파 신호를 발생시켜 3차, 5차 혼변조 왜곡성분을 개별적으로 선형화 하는 새로운 구조의 전치왜곡 선형화기를 제안하였다. 이 구조는 2체배기를 이용하는 3차 혼변조왜곡신호 제어부와 3체배기를 이용하여 5차 혼변조 왜곡신호 제어부를 포함하여 출력신호들의 합성 및 격리를 위한 Wilkinson 전력합성기로 구성되었다. 제안된 개별차수 조정 전치왜곡 선형화기는 870∼880 MHz대역에서 3차 혼변조 왜곡특성은 약 -l6dB와 5차 혼변조 왜곡특성은 약 -l8dB의 개선효과를 얻었으며 출력전력은 34 dBm/tone이었다.

• 한국식품영양학회지
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• 제12권4호
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• pp.387-396
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• 1999

Dog meat was begun to be edible by the Chinese, Japanese, the French, Belginan, German Philippines Vietnamese, North-Americans African-Indians Canadian-aborigines Alaskan aborigines including Kor-eans. According to the record, Korea has a long history to have eaten dog meat from the era of Sam-kug(three kingdoms BC 57∼AC 668) and so there are numerous languages proverbs, and customs re-lated to the dog meat. Over the long history there have been many records and recipes about the edib-leness of dog meat. But at present time only the way of cooking such as Bosintang(a soup) Suyuk(a boiled meat) Duruchighi(boiled meat added spice and slightly roasted) Muchim(boiled meat added by spice and mixed) Gaesoju(an extract) Jeongol(boiled meat mixed with spices vegetables and water on the pot) remains. Koreans eat dog meat following the traditional customs n the Boknal(hottest day in summer). Also the areas of Buyo. Sochon, Boryong adn Chongyang of Chungnam province and the ad-jacent areas like Kongju, Iksan, and Nonsan have customs to kill the dog and offer dog meat to the gue-sts in time of small or big occasions such as funeral ceremony Hoigap(anniversary of one's 60th birth-day) and one's birthday. This range of customs is expanding larger and larger. These areas are the cen-ter of past Baekche(BC 57∼AC 660). In spite of this it is unreasonable, and excessive action for foreig-ner to fine fault with the dog meat or Korean food culture.

• Nuclear Engineering and Technology
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• 제52권12호
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• pp.2969-2974
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• 2020

Looking at the recent studies, nuclear energy and carbon dioxide (CO₂) emissions nexus shows inconclusive result. To further explain nuclear energy-pollution nexuses this study is an attempt to analyze the impact of nuclear energy on pollution reduction for BRICS countries covering data for the period from 1993 to 2017. This study conducts advanced panel techniques such as Continuously-Updated Fully-Modified (CUP-FM) and Continuously-Updated Bias-Corrected (CUP-BC) for long run estimation. Our results support the notion that nuclear energy reduce CO₂ emissions. Also, renewable energy corrects environmental pollution in BRICS countries. The magnitude of the coefficient of nuclear energy is less as compared to renewable energy, implying that nuclear is less effective in reducing environmental pollution. The findings offer significant policy understandings and suggestions not only for BRICS economies but for developing countries as well in designing suitable nuclear energy-growth-carbon policies.

• 한국통신학회논문지
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• 제26권7B호
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• pp.880-883
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• 2001

본 논문에서는 위상 잡음을 개선하기 위해서 Lesson의 위상 잡음 모델을 분석하여 이를 개선시키는 발진기의 구조를 제안하였다. 제안된 구조는 유전체 공진기를 사용한 대역통과 여파기, 평형 저 잡음 증폭기와 출력 전력을 격리시키기 위한 Branch-Line 전력 분배기로 구성되었다. 제안된 구조를 갖는 발진기는 12.653GHz에서 18.5dBm의 출력을 나타내었으며 위상잡음 특성은 중심주파수에서 10kHz 떨어진 곳에서 -82.6dBc/Hz를 나타내었다.

• 전자통신동향분석
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• 제12권3호통권45호
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• pp.42-51
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• 1997

본 고는 유럽의 정보통신표준 시험인증제도 지침서라고 할 수 있는 BC-IT 226도큐먼트 중 D9를 분석한 것으로, 세부적으로는 유럽 역내의 국가들이 운영하고 있는 자발적 부문에서의 시험인증제도가 갖는 유사점을 비롯하여 시험인증제도의 상이함때문에 조화된 시험인증제도를 정립하는 경우 발생되는 많은 문제점과 이러한 문제점을 해결하기 위한 대응방안 등을 고찰하고자 한다.

• 정보학연구
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• 제12권4호
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• pp.11-17
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• 2009

In this paper, frequency synthesizer for radar system is designed and developed. Optimizing the phase noise and lock time, each module is designed as two-type PLL circuit, and then the performance of PLL frequency synthesizer is compared. The experiment result shows the lock time of 70 usec, the phase noise of less then 100 dBc, the bandwidth above 500MHz.