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Fatal Facial Mucormycosis on a Diabetic Patient: A Case Report
최정훈,김영준,권지은,김훈,남상현,최영웅,Choi, Jung-Hun,Kim, Young-Joon,Kwon, Ji-Eun,Kim, Hoon,Nam, Sang-Hyun,Choi, Young-Woong Korean Society of Plastic and Reconstructive Surge 2011 Archives of Plastic Surgery Vol.38 No.1
Purpose: Mucormycosis generally occurs in patients with uncontrolled diabetes mellitus and immunocompromised conditions. It is rare, but once a patient is infected with it, it can occur as a rapidly extending, aggressive, and life-threatening rhinocerebral infection with a high mortality rate. Methods: A 70-year-old female patient had a 40 years of history of adult onset diabetes mellitus. She presented herself with severe right hemifacial pain, swelling, and weakness for 3 days and was admitted to ENT. On a facial computed tomography (CT) scan, it was found that her infection extended from her inferior temporal scalp to her submental area and involved her submandibular, masseter, prevertebral, parapharyngeal, retropharyngeal, and pharyngeal mucosal space and pansinusitis. Through endoscopic sinus surgery, mucormycosis was confirmed via histologic examination. Results: Despite empiric antibiotics and amphotericin B administration, the patient was in a septic condition and in a coma. The patient's family wanted to withdraw her life support, and the patient expired. Conclusion: Mucormycosis is very rare, but is one of the disastrous complications of uncontrolled diabetes mellitus. Suspicion of its occurrence, based on identified risk factors, and its rapid diagnosis can enhance the chance of its cure.
도심지역 노인복지시설 실내 환경에 대한 RF 전자파 노출량의 정성.정량 평가에 관한 연구
최정훈,김남,홍승철,김윤신,최성호,Choi, Jung-Hun,Kim, Nam,Hong, Seung-Cheol,Kim, Yoon-Shin,Choi, Sung-Ho 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.4
In this study in order to evaluate the growth of RF propagation exposure rate generated according to the enhancement of its use, it is proposed for the ground to be able to examine and to contemplate the correlation between the human health and RF propagation exposure rate by measuring and analyzing the RF exposure source and exposure rate in an indoor environment. As a result of research, it is analyzed that the main exposure source of critically making effect in indoor environment is the frequency hand if radio broadcasting, mobile communication, wireless LAN, digital broadcasting, home appliance, etc., including the TV broadcasting. Among these, it is shown that the TV broadcasting and mobile communication band are the highest. And it is the concluded that RF exposure rate of the environmental sensitive equipment, like an institution for the aged, has lower possibility to exceed the human RF protection criteria by this evaluation.
Vterbi decoding을 적용한 UWB 시스템이 성능분석
최정훈(Choi Jung-Hun),한태영(Han Tae-Young),박성균(Park Sung-Kyun),김남(Kim Nam) 한국콘텐츠학회 2003 한국콘텐츠학회 종합학술대회 논문집 Vol.1 No.2
본 논문에서는 고속 데이터 전송을 위한 UWB 시스템에 BPSK(Binary Phase Shift Keying)와 QPSK(Quadrature Phase Shift Keying)의 변조 방식을 적용하고 고속 전송으로 발생 할 수 있는 높은 에러율을 감소시키기 위해 부호율(code rate)이 1/2이고 구속장(constraint length)이 K=7인 convolution code를 적용하였다. 그리고 다중사용자의 접속으로 인하여 발생 할 수 있는 다중사용자 간섭을 고려하여 Time-hopping sequence를 적용하였으며, 수신단에서 viterbi decodig 알고리즘을 사용하여 수신된 신호를 복호함으로서 AWGN(Additive White Gaussian Noise) channel 환경에서의 UWB 통신 시스템의 성능변화를 분석하였다. In this paper, the UWB(ultra widebend) system is used for high speed transmission applying BPSK(Binary Phase Shift Keying) and QPSK(Quadrature Phase Shift Keying), and utilizing the convolution coding with code rate, 1/2 and constraint length, K=7 in order to reduce the bit error rate. And the performance of system is analyzed in the AWGN(Additive White Gaussian Noise) channel environment by using the Viterbi decoding algorithm and adopting the time-hopping sequence as a multiple access method in order to avoid the multiuser interference.
배달앱 특성이 고객발언의향과 지속이용의향에 미치는 영향
최정훈(Jung-Hun Choi),손민희(Min-Hee Son) 한국무역연구원 2022 무역연구 Vol.18 No.6
Purpose – This research investigates the impacts of attributes of food delivery service apps (i.e., review credibility and perceived interactivity) on intention to continue using food delivery service apps, focusing on the mediating role of intention to post consumer reviews on a food delivery service app. Specifically, we examine whether (1) review credibility and perceived interactivity of food delivery service apps influence intention to post consumer reviews on food delivery service apps; if (2) review credibility and perceived interactivity of food delivery service apps positively influence intention to continue using food delivery service apps; and if (3) intention to post consumer reviews on food delivery service apps mediates the effects of review credibility and perceived interactivity on the intention to continue using food delivery service apps. Design/Methodology/Approach – Structural equation modeling (SEM) was used to test the proposed research model on data collected from 246 respondents in an online survey. Findings – Findings indicate that (1) review credibility and the perceived interactivity of food delivery service apps positively affect intention to post consumer reviews on food delivery service apps; (2) review credibility and perceived interactivity of food delivery service apps positively affect intention to continue using food delivery service apps; (3) intention to post consumer reviews on food delivery service apps mediates the impacts of review credibility and perceived interactivity on the intention to continue using food delivery service apps. Research Implications – This study provides theoretical and practical implications for the relationship marketing strategies of online platform services, such as food delivery service apps.
STBC - OFDM과 주파수 다이버시티를 적용한 UWB 시스템이 성능분석
최정훈(Jung-hun Choi),한태영(Taeyoung Han),김남(Nam Kim) 한국콘텐츠학회 2004 한국콘텐츠학회 종합학술대회 논문집 Vol.2 No.1
본 논문에서는 시공간 다이버시티 이득을 갖는 STBC를 UWB 시스템에 적용하고 4차의 다이버시티 이득을 얻기 위해 주파수 반복을 하는 주파수 다이버시티를 적용함으로써 UWB OFDM의 성능을 향상시킬 수 있는 방법을 제안하였다. 그리고 컴퓨터 시뮬레이션을 통한 모의실험으로 제안 하고자하는 시스템의 주파수 다이버시티를 적용한 UWB STBC-OFDM의 성능을 분석하였다. 분석한 결과 본 논문에서 제안한 UWB 시스템은 송신안테나의 증가에 따라 발생하는 복잡도를 줄일 수 있으며, 2개의 송신 안테나만을 사용하고도 주파수 반복에 의한 선형적인 계산만으로 4개의 송신 안테나를 사용하는 것과 같은 성능을 얻을 수 있었다. 제안된 시스템은 일반적인 UWB OFDM과 비교 하면 7.1 ㏈, UWB STBC-OFDM과 비교하면 1.9 ㏈의 성능이 향상되는 것으로 분석되었다. In this paper, STBC (Space Time Block Code) is applied to the UWB system and frequency repeated diversity is used to get the 4-th order space time diversity gain. The performance of UWB STDB-OFDM system is analyzed by computer simulation. As a result of simulation, proposed UWB system can reduce the complexity that is introduced by increasing number of transmit antenna and show the same performance of 4 antennas with only using 2. Proposed system shows the enhancement of 7.1 dB compared to the general UWB OFDM and 1.9 dB compared to UWB STBC-OFDM.