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실차하중 조건의 내구해석을 통한 알루미늄 컨트롤 암의 성능 개선
박종현(Jonghyun Park),손광락(Kwangrak Son),박인희(Inhee Park),박규성(Kyoosung Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The use of aluminum control arm is on the increase to reduce vehicle weight and improve fuel efficiency. In this paper, durability performance of aluminum lower control arm is examined with fatigue analysis using vehicle road load data. Analysis was conducted by quasi-static fatigue analysis method. Analysis results was compared to vehicle test result. Design improvement of lower control arm is suggested to increase durability performance.
Intracranial abscess from facial cellulitis
Park, Jonghyun,Kim, Woo Seob,Kim, Han Koo,Bae, Tae Hui Korean Cleft Palate-Craniofacial Association 2019 Archives of Craniofacial Surgery Vol.20 No.5
Cellulitis, one of most common diseases of everyday life, is often overlooked for its significance. Although cellulitis does not cause or lead to serious problems usually, its possibility to cause lifethreatening problem should be known. In present case, a patient who had received acupuncture treatment a week earlier presented to the clinic with symptoms of facial cellulitis. The disease resolved within few weeks under empirical antibiotic treatment but recurred after 3 months. Under close history review of the patient, we found out that the patient had received craniectomy 20 years ago. The patient had blunt headache with no other neurological symptoms that could suspect cranial infection, but considering the risk originating from the patient's surgical history, brain computed tomography (CT) was taken. CT images revealed abscess formation in the subgaleal and epidural spaces. Craniotomy with abscess evacuation was done promptly. With additional antibiotic treatment postoperatively, the disease resolved, and the 1-month postoperative followup brain CT showed no signs of abscess formation.
Jonghyun Park,Wonjin Sung,Duman, Tolga M IEEE 2010 IEEE communications letters Vol.14 No.11
<P>In this letter, multiuser multiple-input multiple-output (MIMO) precoding which achieves the Gaussian broadcast channel (GBC) capacity under the per-antenna power constraint (PAPC) is investigated. In particular, closed-form expressions for both the MIMO precoder and the corresponding sum capacity are presented for the two-user case. We show that the result can also be utilized to provide the two-user capacity expression under the total power constraint (TPC) of transmit antennas.</P>
Capacity of Sectorized Distributed Networks Employing Adaptive Collaboration from Remote Antennas
PARK, Jonghyun,JANG, Ju Wook,PARK, Sang-Gyu,SUNG, Wonjin The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.12
<P>Distributed networks employing collaborative transmission (CT) from remote antennas can provide improved system capacity and cell-edge performance, by using appropriate transmission strategies. When compared to conventional non-collaborative transmission (NCT) from one base station (BS), we show that CT from two adjacent BSs can be beneficial in terms of the capacity, even when the transmission rate is normalized by the number of collaborating BSs. We further demonstrate that performing adaptive transmission (AT) between NCT and CT based on the instantaneous channel conditions provide an additional gain in capacity. The exact amount of achievable gain is quantified by the closed-form formula for the capacity distribution, which is derived using the Jacobian transformation. The presented distribution is immediately applicable to 6-sectored distributed cellular network, for which we present numerical verification of the results.</P>
Jonghyun Park(박종현),Yoonjin Nah(나윤진),Sumin Yu(유수민),Seung-Koo Lee(이승구),Sanghoon Han(한상훈) 한국인지과학회 2022 인지과학 Vol.33 No.2
일화기억은 핵심 이벤트와 그에 연합된 맥락으로 구성된다. 해마와 해마 주변 영역이 일화기억의 부호화에서 맥락을 표상하는 역할에 관해 연구되어왔지만, 시공간적 맥락 외에 다양한 맥락-특이적 정보들에 대한 표상에 관한 연구는 많지 않다. 본 연구에서는 고해상도 자기기능공명기법을 이용하여 여러 맥락정보(예, 육하원칙 - 누가, 왜, 무엇을 언제, 어디서, 어떻게)의 부호화에 관여하는 내측두엽 및 대뇌피질 신경연결성의 특징을 탐색하였다. 참가자들은 두 명의 얼굴과 하나의 사물로 구성된 실험 이벤트를 보면서 여섯가지 맥락 부호화 과제를 수행하였다. 휴지기 기능적 자기공명영상 정보를 활용해 내측두엽의 세부 영역을 기능적으로 구분하였고 맥락 기억 과제별 기능적 신경연결성 네트워크를 탐색하였다. 일반선형화 모델 분석을 통해 시공간적 맥락정보를 처리할 때보다 사회적, 행동적, 의도 맥락을 연합할 때 내측두엽의 세부영역, 전전두엽, 하부두정엽 영역이 유의미하게 증가한 활성화를 보이며 관여함을 확인하였다. 나아가 이 영역들과 내측두엽 영역이 맥락조건간 차이에 관여하는 기능적 연결성 특징을 탐색하기 위하여 맥락부호화 과제를 수행하는 동안의 해마세부영역들과 전전두엽, 하부두정엽 등 간의 과제기반 기능적 연결성 정보들을 다변량 패턴분석의 주요입력변수로 선정하였고, 기계학습을 통해 맥락 조건 간 연결성 패턴분류를 시도하였다. 네트워크 패턴분류에서도 시공간 맥락 조건과 각 사회적, 행동적, 의도 맥락처리 조건 간에는 기능적 연결성의 차이가 두드러졌다. 본 연구결과를 통해 일화기억에서 특정 맥락을 처리하는 신경학적 기제의 특성과 맥락 조건 간 차이를 제시하였다. Episodic memory consists of a core event and the associated contexts. Although the role of the hippocampus and its neighboring regions in contextual representations during encoding has become increasingly evident, it remains unclear how these regions handle various context-specific information other than spatio-temporal contexts. Using high-resolution functional MRI, we explored the patterns of the medial temporal lobe (MTL) and cortical regions’ involvement during the encoding of various types of contextual information (i.e., journalism principle 5W1H): “Who did it?,” “Why did it happen?,” “What happened?,” “When did it happen?,” “Where did it happen?,” and “How did it happen?” Participants answered six different contextual questions while looking at simple experimental events consisting of two faces with one object on the screen. The MTL was divided to sub-regions by hierarchical clustering from resting-state data. General linear model analyses revealed a stronger activation of MTL sub-regions, the prefrontal lobe (PFC), and the inferior parietal lobule (IPL) during social (Who), behavioral (How), and intentional (Why) contextual processing when compared with spatio-temporal (Where/When) contextual processing. To further investigate the functional networks involved in contextual encoding dissociation, a multivariate pattern analysis was conducted with features selected as the task-based connectivity links between the hippocampal subfields and PFC/IPL. Each social, behavioral, and intentional contextual processing was individually and successfully classified from spatio-temporal contextual processing, respectively. Thus, specific contexts in episodic memory, namely social, behavior, and intention, involve distinct functional connectivity patterns that are distinct from those for spatio-temporal contextual memory.
Jonghyun Park,Euiseok Song,Wonjin Sung IEEE 2009 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.8 No.2
<P>Wireless systems equipped with distributed antennas can provide enhanced data throughput as well as improved signal quality when appropriate cooperative transmission schemes among antennas are employed. In this paper, the performance of distributed antenna systems (DAS) under the influence of Rayleigh fading and log-normal shadowing effects is investigated for different cooperation strategies, and corresponding statistical distributions for both the signal-to-interference ratio (SIR) and the capacity are presented. Specifically, the ergodic capacity per remote antenna (RA) is determined when n RAs cooperatively transmit the desired signal to the target receiver, which is compared with the non-cooperative single-antenna transmission (SAT) case. Using the results, a preferable mode of operation for given geographic locations of the receiver is determined. We further propose to perform an adaptive operation between the cooperative and non-cooperative modes under the capacity maximization criteria, and quantify exact amounts of capacity gain over individual transmission modes.</P>
Extensive and aggressive growth of adenoid cystic carcinoma in the lacrimal gland
Park, Jonghyun,Kim, Han Koo,Kim, Woo Seob,Bae, Tae Hui Korean Cleft Palate-Craniofacial Association 2020 Archives of Craniofacial Surgery Vol.21 No.2
Adenoid cystic carcinoma (ACC) in the lacrimal gland is a very rare disease with poor overall prognosis. Its primary treatment is surgical excision, including orbital exenteration and radical orbitectomy, which is combined with radiotherapy and chemotherapy. Age, histopathologic type, bone invasion, and tumor extent are known factors that affect the prognosis of ACC. Furthermore, perineural invasion is highly associated with local tumor recurrence and tumor base invasion. Here, we report a rare case of ACC in the lacrimal gland with superior sagittal sinus invasion that repeatedly recurred after the surgical excision.
Jonghyun Park,Woochan Kwon,Jongsun Park 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
The genus Camponotus Mayr, 1861 distributes all over the world, even ranging from the African desserts to the Antarctic islands. Number of species in this genus is the largest: 1,488 taxa (species and subspecies) accounting for 10% ant species. Despite of it, number of available complete mitochondrial genomes was only one, Camponotus atrox (subgenus Camponotus). To decipher characteristics of mitochondrial genome of this genus, we completed mitochondrial genomes of Camponotus nipponensis Santschi, 1937, belonging to subgenera Myrmentoma using Illumina HiSeqX. The total length of mitochondrial genome of C. nipponensis is 15,532bp with 79.8% A + T content. It consists of 13 PCGs, 22 tRNA, and 2 rRNA genes and an A+T–rich control region. This mitochondrial genome will be a useful resource to understand features of Camponotus genus with adding more mitochondrial genomes of other subgenera, such as Paramyrmamblys.