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The Capacity of Downlink Multiuser OFDM with Quality Based CSI Feedback
KIM, Jongin,KIM, Dongwoo,KIM, Sehun The Institute of Electronics, Information and Comm 2009 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.92 No.4
<P>The capacity of multiuser OFDM systems can be maximized by allocating resources (subcarrier and power) to the user with the highest instantaneous channel gain. This assumes complete channel state information (CSI) at the transmitter, which is achieved by every user reporting its CSI for all subcarriers to the transmitter via feedback channel. In practice, due to the limited capacity of the feedback channel, the completeness of CSI may be severely restricted especially with a large number of users transmitting a large amount of feedback information. In order to reduce the amount of feedback information while preserving the maximal capacity, quality based CSI feedback (QCF) is proposed in this letter. The system capacity is derived with QCF and compared with that of full CSI feedback. The results show that QCF successfully reduces the amount of feedback information with little capacity loss.</P>
김종인(Jongin Kim),김수철(Soochul Kim),권석천(seokchun Kwon),김준수(Joonsoo Kim),염정덕(Jeongduk Ryeom) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.5월
Hold-type display의 동화상 인식 원리를 이용하여 인간의 시각특성을 고려한 LCD의 동화상 퍼짐 (blur) 노이즈 컴퓨터 시뮬레이터를 개발하였다. 그라고 이 시뮬레이터를 이용하여 동화상 퍼짐 노이즈 특성을 실험한 결과 화상의 이동속도가 빠를수록 퍼짐 노이즈가 증가하며 백라이트의 점등비가 낮을수록 노이즈가 저감된다는 것을 알았다. 이는 기존의 연구결과들과 잘 일치하는 것으로 이것으로부터 본 연구에서 개발한 시뮬레이터의 알고리듬이 타당하다고 할 수 있다.
김선희(Sunhee Kim),이주영(Jooyoung Lee),최서경(Seo Gyeong Choi),지승훈(Seunghun Ji),강지민(Jeemin Kang),김종인(Jongin Kim),김도희(Dohee Kim),김보령(Boryoung Kim),조은기(Eungi Jo),김호정(Hojeong Kim),장정민(Jungmin Jang),김준형(Jun Hyung 한국음성학회 2020 말소리와 음성과학 Vol.12 No.4
본 논문은 응급의료 환경에서 음성인식 성능을 향상시키기 위하여 실제 환경에서 데이터 수집 방법을 정의하고 정의된 환경에서 수집된 데이터를 전사하는 방법을 제안한다. 그리고 제안된 방법으로 수집되고 전사된 데이터를 이용하여 기본 음성인식 실험을 진행함으로써 제안한 수집 및 전사 방법을 평가하고 향후 연구 방향을 제시하고자 한다. 모든 음성은 기본적으로 16비트 해상도와 16 kHz 샘플링으로 저장되었다. 수집된 데이터는 총 166건의 대화로서 8시간 35분의 분량이다. 수집된 데이터는 Praat를 이용하여 철자 전사, 음소 전사, 방언 전사, 잡음 전사, 그리고 의료 코드 전사를 수행하여 다양한 정보를 포함한 텍스트 데이터를 구축하였다. 이와 같이 수집된 데이터를 이용하여 기본 베이스라인 실험을 통하여 응급의료 영역에서의 음성인식 문제를 실제로 확인할 수 있었다. 본 논문에서 제시한 데이터는 응급의료 영역의 1단계 데이터로서 향후 의료 영역에서의 음성인식 모델의 학습 데이터로 활용되고, 나아가 이 분야의 음성기반 시스템 개발에 기여할 수 있을 것으로 기대된다. This paper describes a method of building Korean conversational speech data in the emergency medical domain and proposes an annotation method for the collected data in order to improve speech recognition performance. To suggest future research directions, baseline speech recognition experiments were conducted by using partial data that were collected and annotated. All voices were recorded at 16-bit resolution at 16 kHz sampling rate. A total of 166 conversations were collected, amounting to 8 hours and 35 minutes. Various information was manually transcribed such as orthography, pronunciation, dialect, noise, and medical information using Praat. Baseline speech recognition experiments were used to depict problems related to speech recognition in the emergency medical domain. The Korean conversational speech data presented in this paper are first-stage data in the emergency medical domain and are expected to be used as training data for developing conversational systems for emergency medical applications.
Kim, Jiyoon,Hong, Jongin,Park, Moonkyu,Zhe, Wu,Kim, Dongjin,Jang, Yu Jin,Kim, Dong Ha,No, Kwangsoo WILEY‐VCH Verlag 2011 Advanced Functional Materials Vol.21 No.22
<P><B>Abstract</B></P><P>A facile route is presented for the fabrication of spherical PbTiO<SUB>3</SUB> (PTO) nanodot arrays on platinized silicon substrates using PbO vapor phase reaction sputtering on micellar monolayer films of polystyrene‐<I>block</I>‐poly(ethylene oxide) (PS‐<I>b</I>‐PEO) loaded with TiO<SUB>2</SUB> sol–gel precursor. Short exposure to PbO transforms the amorphous TiO<SUB>2</SUB> into polycrystalline PTO, while keeping the inherent size and periodicity of TiO<SUB>2</SUB> nanodots. HRTEM images show that the spherical PTO nanodots, with an average size and height of 63 nm and 40 nm, respectively, are fixed on the Pt supported by residual carbon. XPS narrow scan spectra of Ti 2p and O 1s strongly verify the evolution of chemical identity and the reduction of the Ti‐O binding energy from TiO<SUB>2</SUB> to PTO. The amplitude and phase images of piezoelectric force microscopy (PFM) confirm a multidomain structure attributed by the crystalline orientation of the PTO nanodots. Furthermore, the discrete PTO nanodots show remarkable switching properties due to the low strain field induced by the small lateral size, and the absence of domain pinning effects by grain boundary.</P>
Investigation of a Bluetooth Module Integrated with an Embedded Antenna
Jongin Ryu,Dongsu Kim,Junchul Kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper presents a Bluetooth module integrated with an embedded antenna based on low temperature co-fired ceramic (LTCC) technology. By removing chip components such as inductors and capacitors for a matching circuit, a compact module can be realized with high performance. The overall size of the antenna itself is less than 3.4 ㎜ × 6.3 ㎜ with a substrate thickness of 0.8 ㎜. The propoesed antenna provides that the resonant frequency is 2. 48 ㎓ with a bandwidth of 53 ㎒ for VSWR < 2. Furthermore, the effect of PCB size and feeding line of the antenna are described as well.
Generating a Ball Sport Scene in a Virtual Environment
( Jongin Choi ),( Sookyun Kim ),( Sunjeong Kim ),( Shinjin Kang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.11
In sports video games, especially ball games, motion capture techniques are used to reproduce the ball-driven performances. The amount of motion data needed to create different situations in which athletes exchange balls is bound to increase exponentially with resolution. This paper proposes how avatars in virtual worlds can not only imitate professional athletes in ball games, but also create and edit their actions effectively. First, various ball-handling movements are recorded using motion sensors. We do not really have to control an actual ball; imitating the motions is enough. Next, motion is created by specifying what to pass the ball through, and then making motion to handle the ball in front of the motion sensor. The ball's occupant then passes the ball to the user-specified target through a motion that imitates the user’s, and the process is repeated. The method proposed can be used as a convenient user interface for motion based games for players who handle balls.
Effects of Humidity and Domain Polarity on Retention Loss in Ferroelectric P(VDF-TrFE) Thin Films
Kim Seonhyoung,Kim Yukwang,Park Kwang-Won,Hong Jongin,Jun Byung-Hyuk 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.1
We investigate over a period of a 500 hours the effect of relative humidity (RH) on the retention loss in ferroelectric P(VDF-TrFE) thin films by using piezoresponse force microscopy (PFM). When the copolymer films are exposed to more water molecules, more domain reversal is observed, especially in upward domains. Interestingly, the retention loss behavior based on a stretched exponential model can be distinctly classified depending on the RH conditions. We conjecture that the absorption and the desorption of water molecules in the P(VDF-TrFE) polymers have a great influence on the reversal of ferroelectric domains.