자기공진 무선전력전송 수신부용 이중 대역 CMOS 정류기 IC 설계

전지호,김창우 한국전자파학회 2019 한국전자파학회논문지 Vol.30 No.12

A dual-band(6.78/13.56 MHz) complementary metal-oxide-semiconductor(CMOS) rectifier integrated circuit(IC) for magnetic resonance wireless power transfer(MRWPT) systems is proposed in this study. The proposed rectifier is designed as a comparator-based active diode rectifier to minimize the losses caused by the threshold voltage of the metal-oxide-semiconductor field-effect transistor (MOSFET). The rectifier consists of two comparators: a self-biasing circuit block and cross-coupled PMOSFET s. The power conversion efficiency(PCE) of the rectifier was maximized by eliminating the reverse current of the comparator by controlling the on-off time of the active diode. The rectifier chip was fabricated following Samsung’s 65 nm CMOS process. The results of the simulation showed that the PCE of the rectifier at 6.78/13.56 MHz increased up to 95.5 %.

Development of High Heat Dissipation Composite Using Al₂O₃, MgO and Carbon Nano Materials

전지호,윤관한 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.1

초소형 S-대역 PCM/FM 텔레메트리 송신기 설계 및 제작

전지호,박주은,김성민,민세홍,이종혁,김복기 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.11

In this paper, we propose an ultra compact S-Band PCM/FM telemetry transmitter. The equipment is compact, so it can be applied to a limited space and capable of stable data transmission was designed and manufactured even with specifications set differently for each operating environment and system. RF direct conversion structure is used for the miniaturization of equipment, an RF transmission board, Power distribution board, and a signal processing board were implemented on a single PCB, so that the function of the transmitter could be performed with a minimum device. According to the target specification, variable output of 1~10W and variable data rate of 390kbps~12.5Mbps is possible in S-Band(2,200~2,400MHz) without degradation of performance. To verify the performance of the equipment, the RF performance test and BER measurement test were performed after the equipment was manufactured. It was confirmed that the OBW, null-to-null bandwidth, 1st IMD, Spurious emission, Phase noise specification of the PCM/FM modulated signal which is presented by the IRIG standard were satisfied, and we can confirm the data received using the transmitter inspection equipment were transmitted normally without distortion. 본 논문에서는 초소형 S-대역 PCM/FM 텔레메트리 송신기를 제안한다. 크기의 소형화로 한정적인 공간에 적용이 가능하며 운용 환경 및 시스템마다 다르게 설정되는 규격에도 안정적인 데이터 송신이 가능한 장비를 설계 및 제작하였다. 장비의 소형화를 위하여 RF 직접변환 구조를 적용하였으며, 최소한의 소자로 송신기의 역할을 수행할 수 있도록 1장의 인쇄회로기판에 RF송신반, 전원분배반, 신호처리반을 구현하였다. 목표한 규격대로 성능의 저하 없이 S-대역(2,200~2,400MHz)에서 1~10W의 출력 가변이 가능하고 390kbps~12.5Mbps의 Data Rate 설정이 가능하도록 설계 및 제작을 진행하였다. 설계 검증을 위하여 장비를 제작한 후 RF 성능 시험 및 비트오류율 측정 시험을 진행하였다. 본 장비는 IRIG (Inter-Range Instrumentation Group) 표준이 제시하는 PCM/FM 변조 신호의 OBW(Occupied Bandwidth), null-to- null 대역폭, 1st IMD(Inter Modulation Distortion), Spurious Emission, Phase Noise 특성이 만족함을 확인하였으며, 송신기 점검 장비를 이용하여 본 장비가 전달받은 Data를 왜곡 없이 정상적으로 송신함을 확인하였다.

한국형 연질치즈의 품질개선에 관한 연구

전지호,강호진,김현욱 한국축산학회 1998 한국축산학회지 Vol.40 No.1

This study was aimed to investigate the possibilities of other cheese variety, which was based upon modified Mozzarella process and ripened by Penicillium candidum. The experimentally-made cheeses have been examined for their chemical, physical, textural and organoleptic properties during ripening depending upon the salting time and the mold strains. The experimentally-made cheeses with different salting time(M2 and M4) were inoculated separately with Penicillium candidum S11 and TRAD, respectively. Moisture contents of M2, M4, S2, S4, T2 and T4 cheeses were 48.89, 49.55, 52.89, 52.25, 50.56 and 49.91%, protein contents were 25.04, 24.12, 25.33, 24.23, 25.70 and 27.22%, and fat contents were 23.75, 23.62, 21.97, 19.82, 19.41 and 19.17%, respectively. Water soluble nitrogen contents of M2, M4, S2, S4, T2 and T4 cheeses were 0.92, 1.01, 2.56, 2.82, 3.58 and 3.70 ㎎/g. TCA soluble nitrogen contents of M2, M4, S2, S4, T2 and T4 cheeses were 0.41, 0.49, 0.75, 0.86, 0.95 and 1.04 ㎎/g. NaCl contents of M2 and M4 cheeses were 2.15 and 2.30 %. Those of S2, S4, T2 and T4 cheeses were 1.76, 2.17, 1.52 and 2.03 % after 2 weeks of ripening and were 1.74, 1.79, 1.43 and 1.80% after 4 weeks of ripening. On electophoretogram of proteins during cheese ripening, caseins of T2 and T4 cheeses appeared to be degaded more than those of S2 and S4 cheeses. Hardness of M2 and M4 were I.51 and 1.33 ㎏. That of S2, S4, T2 and T4 cheeses decreased to 1.15, 0.87, 1.17 and 1.24 ㎏ after 2 weeks of ripening, and deceased to 0.65, 0.77, 0.52 and 0.62 ㎏ after 4 weeks of ripening. Cohesiveness values of M2 and M4 cheeses were 0.53 and 0.50. Those of S2, S4, T2 and T4 cheeses changed to be 0.53, 0.47, 0.53 and 0.55 after 2 weeks of ripening, and to be 0.49, 0.50, 0.54 and 0.55 after 4 weeks of ripening. Tyramine contents of S11 and TRAD during aging increased from 228.2, 170.3 ㎎/㎏(2 weeks) to 558.1, 588.9 ㎎/㎏(4 weeks), respectively. In triangle sensory test, the cheese salted for 4 hrs was found to be different significantly from the others (p$lt;0.05). In descriptive analysis with scaling, significant differences among the treatments were found in the salty taste (p$lt;0.01), but not found in the flavor, texture, and acceptability. In triangle sensory test of S2, S4, T2 and T4 cheeses after ripening, S4-T4 and T2-T4 were different significantly (p$lt;0.05). In descriptive analysis with scaling, they were found to be significantly different in salty taste and acceptability (p$lt;0.01), but not in flavor and texture. T2 cheese, which gave lowest scare in salty taste, was the most favored cheese in overall scores.

음악분석의 대상

전지호 서울대학교 서양음악연구소 2000 음악이론연구 Vol.5 No.-

There can be an objection against the musical analysis on a musical score on the ground that the musical sore is not music itself. It argues that music should be analysed through recording and probing it using computers. The author appraised the validity and the limit of this argument through investigating the concepts inherent in it. In order to avoid the ambiguity of the term 'music' used in the argument, it is necessary to discuss on the concepts of a musical work and the performance of it. It is also needed to examine the meaning and the aiming of musical analysis. From various scholais' opinions derived the author the fundamental purpose of musical analysis as 'acquiring the judgment to understand the musical work and further to evaluate it'. He also pointed that understanding of a musical work presupposes the proper musical space constructed and can be arrived at by constituting an ideal musical phenomenon of the particular work in that space. Roman Ingarden demonstrated that a musical work is 'a configuration beyond individuality and beyond time but at the same time with a pseudo-temporal structure,' and is ultimately a pure intentional object which has the quality of 'not-belonging-to-this-world'(das Nicht-zu-dieser-Welt-Geho¨rens). Despite of the fact that a musical work has its objective existence, it does not belong to this world, so it can not be an object of analysis. Only we can analyse the musical phenomenon which exists in our consciousness. Needless to say, a musical work is different from the performance of it. While Ingarden defined that a musical score is 'the system of imperative symbols which can be customarily settled utilizing any standard descriptive equipments', Suh-Usoc said that a musical score is either a referential sign or an expressive sign but much limited is the possibility that it could be an expressive one. The author pointed that at this very spot is required the musical analysis, and supported the musical analysis on a musical score, defining the musical analysis as 'the work for understanding and appraising of a musical work through finding out and supplementing the aspects that either the score or we ourselves or both lack in constructing the ideal musical phenomenon in our consciousness, that is, in making the musical score an expressive sign'. But the author did not deny the fact that, if the purpose of particular analyses is not 'understanding of a musical work', but, for example, finding out certain physical properties, 'the analysis of the recording of a particular performance using computers' as one of those analyses is agreeable, and some precious and valuable results can be attained through such an analysis.

안구내용적출 시 자가통증조절장치를 이용한 선제적 전신 진통제의 효과

전지호,이가현 대한안과학회 2024 대한안과학회지 Vol.65 No.4

목적: 안구내용적출 시 자가통증조절장치(patient-controlled analgesia, PCA)를 이용한 선제적 전신 진통제 투여가 수술 후 통증에미치는 영향을 알아보고자 하였다. 대상과 방법: 본원에서 전신마취하 안구내용적출을 시행한 환자 중 수치평가척도(numeral rating scale, NRS)를 통한 통증 평가가가능하였던 55명을 수술 후 PCA를 투여한 그룹(group 1)과 수술 전 선제적으로 PCA를 투여한 그룹(group 2)으로 나누었다. 두 군의수술 당일과 수술 후 1, 2, 3일째의 통증 정도를 NRS로 비교하였으며, PCA 외 추가적인 진통제 사용 여부를 비교하였다. 결과: 총 55명의 환자 중 group 1은 17명, group 2는 38명이었다. 수술 당일 3시간, 5시간, 7시간 후의 NRS는 group 2에서 낮은경향을 보였으나 유의미하지 않았다. 수술 후 1, 2일째의 NRS는 group 2에서 유의미하게 낮게 나타났으며(p=0.014, 0.027), 수술후 3일째의 NRS도 유의미하지 않지만 낮았다(p=0.059). 수술 후 추가적인 진통제가 필요하였던 경우 또한 수술 후 0, 1, 2, 3일째모두 group 1에 비해 group 2에서 유의미하게 적었다(p=0.001, <0.001, <0.001, 0.008). 결론: 안구내용적출 시 PCA를 이용해 선제적으로 전신 진통제를 투여한 경우 수술 후 통증 정도가 유의미하게 감소하였으며, 추가진통제 없이 PCA 자체만으로도 통증이 조절된 비율이 높아 효과적인 투여 방법이었기에 이를 보고하고자 한다. Purpose: To investigate the effect of preemptive systemic analgesia using patient-controlled analgesia (PCA) on postoperative pain after evisceration. Methods: Of the patients who underwent evisceration under general anesthesia in our hospital, 55 who were able to evaluate pain using a numeral rating scale (NRS) were included. The patients were divided into two groups: group 1 used PCA after surgery, and group 2 used PCA preemptively before surgery. We compared the two groups in terms of the NRS pain scores on the day of surgery and 1, 2, and 3 days after surgery, and according to whether additional analgesics were used. Results: The 55 patients included 17 in group 1 and 38 in group 2. The NRS at 3, 5, and 7 hours on the day of surgery tended to be lower in group 2, but not significantly (p > 0.05). The NRS on days 1 and 2 after surgery was significantly lower in group 2 (p = 0.014 and p = 0.027, respectively), and the NRS on day 3 after surgery was also lower, although not significantly (p = 0.059). Significantly fewer cases required additional analgesics in group 2 compared to group 1 on the day of surgery and 1, 2, and 3 days after surgery (p = 0.001, p < 0.001, p < 0.001, and p = 0.008, respectively). Conclusions: Using preemptive systemic PCA in evisceration significantly reduced the postoperative pain, and PCA itself was an effective administration method due to the high rate of pain control without the need for additional analgesics.

온칩 솔라 에너지 하베스팅을 위한 에너지 관리 시스템 설계

전지호,이덕환,박종태,유종근 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10

음악과 연결주의 : 컴퓨터 음악의 새로운 개념 The New Concept of Computer Music

전지호 한국음악학회 1995 한국음악학회논문집 음악연구 Vol.12 No.1

As one of our highest expressions of thought and creativity, music has always been a difficult realm to capture, model, and study. The problem it poses have vexed a variety of scholars using traditional approaches from psychology and artificial intelligence. But the connectionist paradigm, now beginning to provide insights into many realms of human behavior, offers a new and unified viewpoint from which to investigate the subtleties of musical experience. Connectionist systems employ "brain-style" computation, capitalizing on the emergent power of a large collection of individually simple interconnected processors operating and co-operating in a parallel distributed fashion. Models of many aspects of musical behavior require the learning, constraint satisfaction, feature abstraction, and intelligent generalization properties that connectionist approaches embody, at the same time demanding further advancement of these techniques. This article includes a brief survey on the history of computer music and connectionism, an introduction to connectionism and the traditional back-propagation principle, and a simple musical example to clarify how a neural network performer a certain task in a fahion resembling human judgements. In our country, many a musician does not have much interest in computer music, partly because the concept of von Neuman architecture has a serious limit in capturing, modelling the sounds (and finally the music) of acoustic instruments (involving human voices). This article introduces a fascinating alternative, connectionism which in principle does not have such a limit. But another reason that makes the computer hard to approach for musicians is that musicians are not (does not even want to be) familiar to the basic principles and concepts on which any operation of a computer is based. But to know them is significant and essential to the use of computer and to the development of computer music. This article is also meant to be an endeavour to let the musicians be aware of the importance and significance of those principles and concepts.

분양전환 공공임대주택이 인근 민간분양주택가격에 미치는 영향: 성남시 분당구를 대상으로

전지호,진창하,김지환 한국부동산분석학회 2022 不動産學硏究 Vol.28 No.3

본 연구는 공공임대주택의 공급과, 이후 분양전환이 인근 주택가격에 미치는 영향을 분석하는 것에 그 목적이 있다. 본 연구의 공간적 범위는 성남시 분당구이며, 시간적 범위는 공공임대주택 공급시점 전후인 2006년에서 2012년, 분양전환시점 전후인 2017년에서 2020년이다. 이중차분법 및 공간가중행렬을 활용한 실증분석 결과에 따르면 공급시점과 분양전환 시점 모두 공공임대주택은 주변 주택가격에 부(-)의 영향을 미치나, 그 영향은 분양전환 시점에 현저히 줄어드는 것으로 나타났다. 특히 연구대상인 성남시 분당구 소재 공공임대주택의 경우, 분양전환 시점에 기존 임차인이 대부분 수분양자로 전환되었다는 사실을 감안한다면, 공공임대주택이 인근 주택가격에 미치는 부의 외부효과는 해당시설의 물리적 특성보다, 당해시설에 대한 주변의 부정적 인식과 우려가 더 상당하고 보는 것이 타당하다. 이러한 분석결과는 공공임대주택에 대한 주변의 인식 개선을 위한 다각도의 정책적 노력이 필요함을 시사한다.

드뷔시 피아노를 위한 전주곡 제1집 Voiles 분석 : 모호성과 정합성의 변증법

전지호 민족음악학회 1998 음악과 민족 Vol.15 No.-