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이문규 한국과학사학회 2023 한국과학사학회지 Vol.45 No.3
Cheomseongdae in Gyeongju is the oldest astronomical observatory in the world and a representative scientific cultural heritage in Korea. However, in the mid-twentieth century, suspicions were raised that Cheomseongdae might not be an observatory. As these suspicions piled up, a heated debate began about Cheomseongdae, which is still ongoing. I will examine the situation of the Cheomseongdae debate based on recent research results. First, some researchers interpreted the name Cheomseongdae as an astronomical observatory. However, other researchers interpreted the term “Chumseong[瞻星]” and the word “Dae[臺]” as symbolic. Second, many researchers view the shape of Cheomseongdae as a well since the shape of the top of Cheomseongdae resembles the letter “jeong(井),” which means a well. Third, there were conflicting interpretations of the unique structure of Cheomseongdae. Some said that it could not be seen as an observatory because it was inconvenient to climb to the top. On the contrary, some viewed it as an observatory because one could go up to the top of Cheomseongdae. The Cheomseongdae debate is unlikely to end easily. In order to end the Cheomseongdae debate, it is necessary to accurately distinguish between the factual contents of Cheomseongdae and the imagination felt after seeing it. And historical data should not be interpreted based on personal speculation or improper grounds.
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YIG 공진기를 이용한 고주파 광대역 발진기 설계 및 제작
이문규,염경환,남상욱 한국통신학회 1994 한국통신학회논문지 Vol.19 No.9
본 논문에서는 광대역 YIG발진기를 설계하고 제작하였다. YTO(YIG Tuned Oscillator)의 설계는 우선 발전범위에 적당한 YIG 공진기를 선택하고, 발진 범위에서 공진특성을 측정하여 전기적인 RLC등가회로를 만든다. 이 등가회로를 이용하여 광대역에서 기생발진 없이 발진할 수 있는 회로 구조를 선택하고 설계한다. 설계된 회로는 EEsof사의 jOMEGA를 이용하여 HBT(Harmonic Balance Technique)으로 모의실험하였다. 이렇게 하여 제작된 YTO의 발진범위는 1.4GHz에서 4GHz였고, 발진범위 내에서 선형성은 0.5%였다. 위상잡음은 중심 주파수에서 100kHz offset에서 105dBc이하였다.
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이문규,남상욱,염경환,홍성용 한국통신학회 1996 한국통신학회논문지 Vol.21 No.9
A simple iterative design method is presented for the miniaturized dielectric filter with finite transimmission zeros. Circuit-network transformations are used to place transission zeros in the stop band. This method is simple and quick compared with conventional pole-synthesis methods. the design of the coupling EM patternof the filter needs the much computation time because its design is carried out through the field simulatior. In this paper, an efficient implementation technique of coupling circuit parameters is presented. This technique uses a linear mapping function between the circuit parameter domain and EM parameter domain to save the high computational time of EM simulator. A narrow band asymmetric filter with a transmission zero is designed and fiblicated through these technique in 1900 MHz band.
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이문규 한국전자파학회 2003 전자파기술 Vol.14 No.3
마이크로파 능동필터는 RF 시스템에서 주목받고 있는 SoC(System on Chip) 기술을 위한 필터의 집적화 기술로 매우 활발한 연구가 수행되어지고 있다. Chip상에서의 마이크로파 대역에서의 능동필터는 기판의 손실로 인한 공진기의 Q값 저하를 능동소자를 이용하여 보상하여 협대역 필터의 구현을 가능하게 할 뿐만 아니라, 바렉터 다이오드나 PIN다이오드를 회로에 적용하여 가변 필터의 구현도 가능하게 되어 시스템의 유연성이 높은 SDR(Soft-wave Defined Radio) 등에도 적용될 수 있는 분야로 각광을 받을 것으로 판단된다. 본고에서는 마이크로파 능동 필터에 대한 분류와 회로의 구조 연구 동향에 대해 살펴본다.
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이문규,진상윤,Lee, Moon-Kyu,Chin, Sang-Yoon 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.1
Construction industry throughout the construction projects life cycle using BIM is able to manage information. Among them, BIM-based quantity take-off is directly connected to the data of the construction business as an important management element that is essential for one of the management factors of feasibility study and economic analysis. In addition, the result of BIM-based quantity take-off can be varied depending on modeler, so the exact guideline for BIM modeling is necessary. The BIM-based quantity take-off in terms of reliability and accuracy of the information is very important. Therefore, this study verified the BIM modeling of the apartment interior materials using both separate object and composite object was validated the quantitative comparison of the difference in BIM-based quantity take-off for accuracy & reliability judgment of BIM-based quantity take-off and realistic & desirable suggestion of BIM modeling way. As the result of this study, it is preferable to model various interior materials to use separate object for the purpose of correct BIM-based quantity take-off, but the realistic way of the BIM modeling using both separate object and composite object jointly was verified in order to judge BIM-based quantity take-off in terms of work productivity.
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부호화 해밍 웨이트를 이용한 가변 타원곡선 암호시스템의 안전성 향상
이문규 한국정보과학회 2004 정보과학회논문지 : 시스템 및 이론 Vol.31 No.10
Scalar multiplication is to compute kP when an integer k and an elliptic curve point P are given. As a general method to accelerate scalar multiplication, Agnew, Mullin and Vanstone proposed to use k's with fixed Hamming weights. We suggest a new method that uses k's with fixed signed Hamming weights and show that this method is more secure. 스칼라 곱셈은 정수 k와 타원곡선 상의 한 점 P가 주어졌을 때 kP를 계산하는 연산이다. 스칼라 곱셈을 빠르게 하기 위한 일반적인 방법으로 Agnew, Mullin, Vanstone은 고정된 값의 해밍 웨이트를 갖는 스칼라 k를 이용하는 방법을 제안하였다. 본 논문에서는 고정된 값의 부호화 해밍 웨이트를 갖는 k를 이용하는 방법을 제안하고, 이 방법이 더 안전함을 보인다.
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이문규,김지은,장우영,조광덕,김원준,송재석 대한신경과학회 2018 대한신경과학회지 Vol.36 No.3
Background: Seizure can be triggered by the non-ketotic hyperglycemia (NKH). Recently we analysed 18 cases of NKH induced seizure to identify the causes for NKH, seizure types, prognosis, and the differences of clinical presentation between the patient with chronic brain structural lesion (CBSL) and the patient without. Methods: Eighteen patients with NKH induced seizure were selected from the database. Data regarding brain images, clinical symptoms, co-morbid illnesses, blood laboratories, and prognosis were collected. Patients were divided into two groups according to the presence of CBSL. Results: The patients with CBSL showed more generalized tonic-clonic seizure (GTCS) than without. Focal seizures in this group appeared to be originated from the pre-existing lesion in many situations. The poor compliance to anti-diabetic treatment and physical stresses were most common causes for NKH. One year seizure remission without anti-epileptic drug treatment was achieved in 17 of 18 patients. Conclusions: The patients with CBSL might have more GTCS than without. The impairment of inhibitory mechanism surrounding the focal irritative zone might be one of plausible explanation for this phenomenon. The prognosis was favorable. Further large studies are required.
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