비대칭 차동 인덕터를 이용한 2.4-GHz 선형 CMOS 전력 증폭기

장성진,이창현,박창근,Jang, Seongjin,Lee, Changhyun,Park, Changkun 한국정보통신학회 2019 한국정보통신학회논문지 Vol.23 No.6

본 연구에서는 차동 구조의 고주파 증폭기를 위한 비대칭 차동 인덕터를 제안하였다. 제안 된 비대칭 차동 인덕터는 증폭기 내 차동 신호 간 위상 오차를 완화하기 위한 것으로서, 차동 인덕터에 형성되는 Center-tap의 위치를 조정하여, 전력 증폭기를 구성하는 구동 증폭기의 차동 신호에서 바라보이는 임피던스가 동일하게 형성 되도록 하였다. 이를 통하여 기존 차동 인덕터를 사용하는 경우 대비 AM-to-AM 및 AM-to-PM 왜곡이 완화됨을 확인 하였다. 제안하는 비대칭 차동 인덕터의 효용성을 확인하기 위하여 180-nm RFCMOS 공정을 이용하여 2.4-GHz CMOS 전력 증폭기를 설계하였으며, EVM 5% 기준 20 dB의 전력 이득과 17 dBm의 최대 선형 출력 전력을 얻었다. In this study, we proposed an asymmetric differential inductor to improve the linearity of differential power amplifiers. Considering the phase error between differential signals of the differential amplifier, the location of the center tap of the differential inductor was modified to minimize the error. As a result, the center tap was positioned asymmetrically inside the differential inductor. With the asymmetric differential inductor, the AM-to-AM and AM-to-PM distortions of the amplifier were suppressed. To confirm the feasibility of the inductor, we designed a 2.4 GHz differential CMOS PA for IEEE 802.11n WLAN applications with a 64-quadrature amplitude modulation (QAM), 9.6 dB peak-to-average power ratio (PAPR), and a bandwidth of 20 MHz. The designed power amplifier was fabricated using the 180-nm RF CMOS process. The measured maximum linear output power was 17 dBm, whereas EVM was 5%.

머신러닝 기반 스마트 단말기 Lithium-Ion Cell의 잔량 추정 방법의 실증적 연구

장성진,Jang, SungJin 국제문화기술진흥원 2020 The Journal of the Convergence on Culture Technolo Vol.6 No.4

지난 몇 년 동안 스마트 폰을 비롯한 다양한 스마트 기기들은 휴대성을 기반으로 사용자의 요구에 의해 지속적으로 성능이 향상 되고 있다. 유비쿼터스 컴퓨팅 (Ubiquitous Computing) 환경과 센서 네트워크 (Sensor network)등의 다양한 망 접속 기술로 인하여 휴대성을 기반으로 하는 단말기들이 다양하게 보급되어 사용되고 있다. 스마트 단말들은 사용 중에 보다 안정적인 동작을 위하여 에너지 모니터링을 세밀하게 할 수 있는 기술이 필요하게 되었다. 소형 경량화 된 스마트 단말기는 다양한 멀티미디어 작업으로 인하여 단말 운용 중에 전원 부족 문제가 발생하게 된다. 이와 같은 상황을 미리 방지하고 안정적인 단말 운용을 위해서 기존에 다양한 추정 하드웨어가 개발 되었다. 그러나 잔량 추정을 하는 방법이나 성능이 비교적 우수하지 못하였다. 본 논문에서는 스마트 단말의 운용 중에 발생 할 수 있는 잔여 잔량 문제를 미리 예측하여 보다 안정적인 운용을 위한 리튬이온 셀의 잔량 추정 방법을 머신러닝에 기초를 두고 연구 하였다. 기존의 하드웨어적인 추정 방법이 아니라 사용 중인 리튬이온 셀의 특성을 머신러닝 기법을 이용한 학습 알고리즘으로 학습 시키고 최적화된 결과를 추정하여 적용 하고자 한다. Over the past few years, smart devices, including smartphones, have been continuously required by users based on portability. The performance is improving. Ubiquitous computing environment and sensor network are also improved. Due to various network connection technologies, mobile terminals are widely used. Smart terminals need technology to make energy monitoring more detailed for more stable operation during use. The smart terminal which is light in small size generates the power shortage problem due to the various multimedia task among the terminal operation. Various estimation hardwares have been developed to prevent such situation in advance and to operate stable terminals. However, the method and performance of estimating the remaining amount are not relatively good. In this paper, we propose a method for estimating the remaining amount of smart terminals. The Capacity Estimation of lithium ion cells for stable operation was estimated based on machine learning. Learning the characteristics of lithium ion cells in use, not the existing hardware estimation method, through a map learning algorithm using machine learning technique The optimized results are estimated and applied.

플립러닝을 적용한 알고리즘 이론교과목의 효과적인 교수학습방법 설계

장성진,Jang, Sung-jin 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.5

최근 새로운 산업 환경의 변화에 필요한 맞춤형 기업 인재양성을 위한 효과적인 교수학습방법으로 플립러닝이 주목 받고 있다. 기존 강의식 수업방식의 경우 중도탈락률이 높고 창의적 문제 해결력을 저해하는 등의 다양한 문제점이 있다. IT 공과대학의 경우 선수 교과목의 선행이 필요한 전공 이론과목이 대부분이므로 학생들의 학습 참여도와 학업 성취도를 높일 수 있는 효과적인 교수학습방법의 개발이 필요하다. 본 논문에서는 학생들의 학습 동기를 유발하고 자기 주도적 학습을 통한 학습 효과를 높이기 위해 플립러닝과 실습수업을 병행한 5단계 플립러닝 수업모형을 제안하였다. 또한 컴퓨터공학과의 알고리즘 수업에 적용하여 학습 효과를 분석하고 그 결과를 바탕으로 문제점 및 활용방안을 제시하고자 한다. Recently rapid changes in the industrial environment require new talents in companies. Flipped learning is drawing attention as an effective teaching-learning method. The existing traditional lecture teaching-learning method have various problems that the dropout rates of the student is high and the creative problem solving ability is hindered. In the case of the IT engineering college, most of the major theoretical courses require prior learning of the prerequisite coursework subjects. Therefore, effective teaching-learning methods must be developed to improve student participation and academic achievement. This paper proposes the flipped learning model consisting of five sets that combine the flipped learning and practice to improve student motivation and self - directed learning. Also, this paper analyzes the learning effect by applying it to the algorithm lecture of computer engineering and presents problem and utilization plan according to the result.

음성 AI 콜봇 디자인 평가 방법을 위한 은행 사례 연구

장성진(Seongjin Jang),김지향(Jeehyang Kim),이남수(Namsoo Lee),강서림(Seorim Kang),강현민(Hyunmin Kang) 한국디자인학회 2023 한국디자인학회 학술발표대회 논문집 Vol.2023 No.10

낙동강 영산전투시 북한군의 도하작전 분석

장성진(Jang, Sung-jin) 국방부 군사편찬연구소 2011 군사 Vol.- No.78

The North Korean Peoples Army(NKPA) accepted and translated the Soviet Military Doctrine before the Korean War(1950~1953), and so the Soviet Military Doctrine affected the North Korea way of the battle. Particularly the “Crossing Operations” doctrine is an important matter because of the configuration of the Korea ground-Han River, Geum River and Nakdong River. And so the North Korea recognize the fact that crossing operations were important but they didn’t have sufficient troops and equipment for this operations. But NKPA executed the crossing operation at early combat in Korean War by the military doctrine, NKPA’s FM “Crossing Operations”. Therefore this study show that how the military doctrine executed in the Nakdong Bulge Battle. The river crossing operations classify into two groups, elaborate-crossing and prompt-crossing operations. The Nakdong Bulge Battle at the NKPA’s August Offensive was not elaborate-crossing, but prompt-crossing operations. The NK 4th Division could secure a bridgehead by surprise attack through the crossing Nakdong River in secret. But they didn’t extend the bridgehead. At first reason is that they delayed the heavy equipment (like as tank and artillery) crossing operations because that they did not have equipment for this operations. The Second is that decision of Walker and counterattack of the Marine Brigade. The Nakdong Bulge Battle at NKPA’s September Offensive was elaborate-crossing operations. They did make a thorough preparation the crossing operations for success. For example, they prepared the underwater bridge, raft bridge, personal equipment and others. Particularly their patrol get information about the enemy’s movements. Through this preparation of crossing operations and patrol, the NK 2nd and 9th Divisions also could secure a bridgehead. They could clear obstacles like enemy’s tank and an artilleryman, separate US 2nd Division, and cross the heavy equipment. But NKPA didn’t extend the bridgehead. The first reason is that their concept of the crossing operations was only division grade operations, not corps grade operations. If September Offensive was corps grade operation, they had hold the succeed division and so could gain a decisive victory at the Nakdong bulge. But they didn’t. The secondary reason is that decision of Walker and counterattack of the Marine brigade.

명품과 배경음악이 충동적 의사결정에 미치는 영향

장성진 ( Seongjin Jang ),한광희 ( Kwanghee Han ) 한국감성과학회 2017 감성과학 Vol.20 No.1

본 연구에서는 상품과 배경음악이 사람들의 충동적인 의사결정에 미치는 영향을 지연 할인의 쌍곡선 함수를 이용하여 알아보았다. 구체적으로 상품과 배경음악에 따라 유의미한 이원 상호 작용이 존재했다. 명품 조건에서는 모차르트의 피아노 콘체르토 5번 장조 음악을 들었을 때, 20번 단조 음악을 들었을 때보다 충동성이 유의미하게 높았다. 하지만 실용 상품에 노출된 참가자들에게선 음악의 종류에 따라 충동성의 차이는 유의미하지 않았다. 추가 연구를 통해 음악을 더 세분화하여 빠르기를 조절하여 그 영향을 알아보았으며 동시에 정서가 위와 같은 결과를 매개 했는지 알아보았다. 결과적으로 정서의 매개효과와 빠르기의 주효과 모두 유의미하지 않았지만, 빠르기와 장단조 조건 간의 유의미한 이원 상호작용이 나타났다. 구체적으로 알레그로(allegro) 빠르기에서는 장조음악일 때가 단조 조건일 때보다 충동성이 높은 경향성이 나타났으며 안단테(andante) 빠르기에서는 장조 음악을 들었을 때가 단조 음악을 들었을 때보다 유의미하게 충동성이 낮게 나타났다. 우울한 정서를 예측 변수로 하고 미래 시간 길이 지각을 매개 변인으로 하여 추가연구를 진행한 결과, 시간 길이 지각은 우울한 정서가 충동성에 미치는 영향을 부분 매개함을 알 수 있었다. In this study, we figured out that music modes and item types could affect people`s urged decision making through a k-value which results from a delay discounting`s hyperbolic function. Generally, high k-value is related to impulsive decision making. Concretely, there was a significant interaction between items and music. For the luxury item, the k-value was higher while listening to major music than minor. However, for the non-luxury item condition the k-value difference was not significant between two pieces of music. Moreover, we expected mood could be manipulated after listening to the music and mediate a difference of tendency. We used first movement as an allegro and second as an andante of Mozart piano concerto No.5 D-major and No.20 D-minor for stimuli. As a result, mode and tempo`s main effects were not significant. Nevertheless, there was a significant two-way interaction. To put it concretely, the k-value of major condition was marginally higher than minor condition on allegro. However, the k-value of major condition was significantly lower than minor condition on andante. Also, depressed degree difference was significant but it was not significant as a mediator. Set depressed degree as a predict variable and future time span as a mediator, further research found future time perception partially mediated the effect that depressed degree affects impulsivity.

한국전쟁 이전 소련군 교범을 활용한 북한군 전투훈련 과정 연구

장성진(Jang, Sung-jin) 국방부 군사편찬연구소 2012 군사 Vol.- No.83

The purpose of this paper is to analyze how the Soviet Field Manual was adopted and reflected in the combat training manual of North Korean Peoples Army. This combat training was divided into two parts: ‘Military Science"(strategy and operation) and ‘Military Technique"(tactics). When NKPA was established(1945~1950), ‘The Field Regulation" was taken as NKPA"s main manual in the aspect of ‘Military Science" which emphasized cooperation and mobility during warfare. Moving on,‘The Infantry Combat Regulation" which was included in the ‘The Field Regulation" was chosen as the standard manual for NKPA infantry in the aspect of ‘Military Technique". It is possible to confirm that it was created based on the Soviet Union"s manual from related documents like RG242 NARA as well. From this, soldiers of NKPA could be trained well and this led to the outbreak of the war on the 38th Parallel. As for the positive results for North Korea, Kim Il Sung gained confidence on his military power which had clear superiority over that of ROK Army. Later, the training based on the manual strengthened NKPA and contributed to success in the early part of the Korean War. Then, Kim stressed the importance of following this manual continuously and included ‘The Infantry Combat Regulation" in it. Even though North Korea accepted the truce negotiation later, the process mentioned above continued to reflect the Soviet Union’s manual in the modern military training of NPKA today.

醫療氣功의 유효성에 대한 고찰

장성진(Sung Jin Jang),안훈모(Hun Mo Ahn),박은정(Eun Jeung Park) 대한의료기공학회 2003 醫療氣功 Vol.7 No.1

Research studies of Qigong therapy for cure for the past 20 years were reviewed from three different categories: clinical study on human patients, in-vitro study of abnormal cells, and in-vivo study of abnormal cell with Qigong therapy, in an attempt to understand the role Qigong therapy plays in many kinds of disease. There is a lot of evidence suggesting that Qigong therapy has an inhibitory effect on abnormal cell growth, both in vitro and in vivo studies, as well as in clinical observation (often there was room for improvement in these studies and some studies require replication in order to verify their findings). Qigong therapy is an area that is often neglected by mainstream medicine and research, and it should be seriously examined and considered as an important supplement to conventional treatment.

동잡음을 가진 PPG 센서에서의 산소포화도 측정 알고리즘

장성진 ( Seong-jin Jang ),최규락 ( Kue-lak Choi ),박근혜 ( Keun-hae Park ),김정도 ( Jeong-do Kim ) 한국센서학회 2018 센서학회지 Vol.27 No.3

Pulse oximetry is a non-invasive method for monitoring how much oxygenated hemoglobin is present in the blood. The principle of pulse oximetry is based on the red infrared light adsorption characteristics of oxygenated and deoxygenated hemoglobin. Even through the convenience of a pulse oximeter, its weak signal-to-noise ratio against motion artifacts and low perfusion makes it difficult to be accepted by execs devices. Several researchers have suggested the use of an adaptive noise cancellation (ANC) algorithm. They have demonstrated that ANC is feasible for reducing the effects of motion artifacts. Masimo Corporation developed a discrete saturation transformation (DST) algorithm that uses a reference signal and ANC. In commercial devices, it is very hard to escape it because Masimo’s patents are very powerful and a better method is yet to be developed. This study proposes a new method that can measure noise saturation as well as accurate oxygen saturation from signals with high motion artifacts without using ANC and DST. The proposed algorithm can extract a normal signal without noise from a signal with motion artifacts. The reference signal from a pulse oximeter simulator was used for the evaluation of our proposed algorithm and achieved good results.

Coffee'n LoaF

Jang Sungjin(장성진) 현대건축사 2012 (월간)Maru Vol.- No.129