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정원호,박숙경,조도연,홍성화 대한이비인후과학회 2003 대한이비인후과학회지 두경부외과학 Vol.46 No.8
Background and Objectives:The purpose of this study is to find out the exact distribution of nitric oxide synthase (NOS) in the cochlea and vestibular organ of normal guinea pig. Nitric oxide (NO) is synthesized from L-arginine catalyzed by NOS and neurotransmision of the inner ear and the regulation of cochlear blood flow in physiological condition. In addition, exces NO is involved in cytotoxicity. Materials and Method:Five normal guinea pigs were used. Antibodies to thre isoforms of NOS (nNOS, eNOS, iNOS) were utilized to stain the parafin sections of cochlea and vestibular organ (crista and maculae utriculi). Staining patterns were compared to previous reports. Results:Neuronal NOS (nNOS) was constitutively expressed in the lateral cochlear wall (stria vascularis, spiral ligament), spiral ganglion, hair cells and supporting cells in the cochlea. In the vestibular organs, hair cels were well expressed. Endothelial NOS (eNOS) was expresed in the vascular endothelium, cochlear lateral wall, basal parts of hair cells and spiral ganglion in the cochlea. Vascular endothelium and nerve fiber including nerve calyx were also prominently expressed. No inducible NOS (iNOS) was identified in any sections. Conclusion:Neuronal and endothelial NOS were constitutively expresed in the inner ear of normal guinea pig. This distribution can explain the role of (Korean J Otolaryngol 2003 ;46 :627-33)
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정원호 한국농촌경제연구원 2013 농촌경제 Vol.36 No.2
Previous studies have shown that weather derivatives are an effective means of hedging agricultural production risk. Yet, it is still unclear what role weather derivatives will play in agriculture as a risk management tool as compared with existing crop insurance programs which depend highly on government subsidies. This study compares the hedging cost and effectiveness of weather options and crop insurance for soybean in southern Minnesota. Our results show that the hedging effectiveness of weather options is limited at the farm level while the effectiveness increases as the level of aggregation increases. Thus, individual farmers will continue to prefer the federal crop insurance program to weather derivatives for their production risk management. However, the US government as an insurer, which currently does not hedge its risk exposures taken from farmers in the federal crop insurance program, could reduce the implied social cost in the form of un-hedged risk exposure by use of the weather options in the financial market.
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781MHz 대역에서 MIMO 전파 채널 측정 및 분석
정원호,김주석,정명원,윤영근,김종호,김경석 한국인터넷방송통신학회 2012 한국인터넷방송통신학회 논문지 Vol.12 No.2
본 논문은 국내 781MHz 대역에서 실외 다중경로 환경을 고려한 MIMO 채널 측정을 통해, 측정 데이터를 분석하고 채널 파라미터를 도출하였다. 781MHz는 현재 DTV 시스템이 동작하는 주파수 대역이나, 머지않아 신규 이동통신 주파수 대역으로 할당될 예정이다. 781MHz는 기존 900MHz 이동통신 시스템의 채널특성과 유사할 것으로 보이지만 이동통신망으로 연구된 사례가 미비하기 때문에 신호전달 과정의 채널특성 연구가 필요하다. 현재 운용되고 있는 DTV 방송과 혼신을 피하기 위하여 제주도 인근 도심/교외지역에서 한국전자통신연구원의 사운더와 4×4 안테나로 채널특성을 측정하였다. 측정된 데이터를 바탕으로 Path Loss, Delay Spread, Angular Spread, K-factor 등의 채널 파라미터들을 도출하였다. In this paper, the measurement data is analyzed and channel parameters are derived through MIMO Channel measurements at 781MHz considering outdoor multi-path environment. 781MHz frequency band currently operates the DTV system. However, it will be allocated new mobile communication frequency band. The channel characteristics at 781MHz seem to be similar existing mobile communication system at 900MHz but a study on channel characteristics of signal transfer process is necessary because there is incomplete study in mobile networks at 781MHz. To avoid interference with Korean DTV broadcasting, we measured channel characteristics in city/suburban areas of Jeju island by channel sounder and 4×4 antenna of the ETRI(Korea Electronics and Telecommunications Research Institute). Path Loss, Delay Spread, Angular Spread and K-factor were derived based on measured data.
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전립선비대증으로 인한 하부요로증상을 호소하는 환자에서 전립선 조직 내 염증의 의미
정원호,최미선,장혁수,박철희,김천일 대한비뇨의학회 2009 Investigative and Clinical Urology Vol.50 No.8
Purpose: Histological evidence of intraprostatic inflammation is a common finding of transrectal ultrasonography (TRUS)-guided needle biopsy of the prostate in patients with lower urinary tract symptoms suggestive of benign prostatic hyperplasia (BPH). The aim of this study was to evaluate the relationship between intraprostatic inflammation and lower urinary tract symptoms depending on the severity of intraprostatic inflammation. Materials and Methods: Between January 2002 and December 2006, 141 BPH patients with prostate-specific antigen (PSA) of 4.0-10.0 ng/ml underwent TRUS-guided biopsy of the prostate. The extent and aggressiveness of intraprostatic inflammation were classified into 4 grades. The relationship between the grades of extent and aggressiveness of inflammation and the International Prostate Symptom Score (IPSS) was evaluated. The IPSS was evaluated according to voiding and storage symptom scores. Results: Mean storage symptom scores were increased by grade of the extent of intraprostatic inflammation (grade 0, 6.3; grade 1, 10.1; grade 2, 11.0; and grade 3, 11.3) (p<0.001). The aggressiveness of intraprostatic inflammation also showed increasing storage symptom scores with grade (grade 0, 6.3; grade 1, 10.2; grade 2, 10.9; and grade 3, 11.6) (p<0.001). Voiding symptom scores had no relationship with extent or aggressiveness of intraprostatic inflammation (p=0.942 and p=0.449, respectively). Conclusions: BPH patients with intraprostatic inflammation complained of more severe storage symptoms than did patients without inflammation. Therefore, if storage symptoms are severe, we might consider medical treatment for intraprostatic inflammation in BPH patients. Purpose: Histological evidence of intraprostatic inflammation is a common finding of transrectal ultrasonography (TRUS)-guided needle biopsy of the prostate in patients with lower urinary tract symptoms suggestive of benign prostatic hyperplasia (BPH). The aim of this study was to evaluate the relationship between intraprostatic inflammation and lower urinary tract symptoms depending on the severity of intraprostatic inflammation. Materials and Methods: Between January 2002 and December 2006, 141 BPH patients with prostate-specific antigen (PSA) of 4.0-10.0 ng/ml underwent TRUS-guided biopsy of the prostate. The extent and aggressiveness of intraprostatic inflammation were classified into 4 grades. The relationship between the grades of extent and aggressiveness of inflammation and the International Prostate Symptom Score (IPSS) was evaluated. The IPSS was evaluated according to voiding and storage symptom scores. Results: Mean storage symptom scores were increased by grade of the extent of intraprostatic inflammation (grade 0, 6.3; grade 1, 10.1; grade 2, 11.0; and grade 3, 11.3) (p<0.001). The aggressiveness of intraprostatic inflammation also showed increasing storage symptom scores with grade (grade 0, 6.3; grade 1, 10.2; grade 2, 10.9; and grade 3, 11.6) (p<0.001). Voiding symptom scores had no relationship with extent or aggressiveness of intraprostatic inflammation (p=0.942 and p=0.449, respectively). Conclusions: BPH patients with intraprostatic inflammation complained of more severe storage symptoms than did patients without inflammation. Therefore, if storage symptoms are severe, we might consider medical treatment for intraprostatic inflammation in BPH patients.
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정원호 덕성여자대학교 자연과학연구소 2003 자연과학 논문집 Vol.9 No.-
이동 에이전트는 분산 응용에 있어서 네트워크의 부하와 대기시간을 줄일 수 있는 기술 중 하나이며, 다양한 네트워크 환경에 대한 유연성이 좋아 향후 기대되는 분산 응용 기반 기술이라 할 수 있다. 본 논문에서는, 네트워크 기반의 분산 응용에 효율적으로 이용될 수 있는 이동 에이전트 프로그래밍 시스템인 HUMAN이 설계 구현되다. HUMAN은 분산 객체인 이동 에이전트를 이용하는 응용 프로그램 설계를 위한 Java 기반의 프레임워크이다. HUMAN은 파일 탐색, 그룹 어드레싱, 다양한 여정 모드, 유연 응답 기능, 그리고 여정 및 탐색 대상 정보의 입력 등의 고급 유틸리티 등을 지원하고 있어, 에이전트 프로그래밍에 있어서 높은 수월성을 제공하고 있으며, 불법파일 탐색, 파일 공유 등과 같은 분산 응용에 특히 유용할 수 있다. 또한 에이전트 등록, 해지 등을 위한 관리 서버 등을 제공하고 있어, peer-to-peer(P2P) 관련 분산 응용 시스템의 개발에도 용이하게 적용할 수 있다는 장점을 가지고 있다.
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효율적 분산 응용을 위한 이동 에이전트 프로그래밍 시스템
정원호,강미연,김윤수,Jeong, Won-Ho,Kang, Mi-Yeon,Kim, Yun-Su 한국정보처리학회 2003 정보처리학회논문지 A Vol.10 No.5
이동 에이전트는 분산 응용에 있어서 네트워크의 부하와 대기시간을 줄일 수 있는 기술 중 하나이며, 네트워크 환경에 대한 적응성이 좋아 향후 기대되는 분산 응용 기반 기술이라 할 수 있다. 본 논문에서는, 다양한 분산 응용 개발에 효율적으로 이용될 수 있는 이동 에이전트 프로그래밍 시스템인 HUMAN이 설계, 구현된다. HUMAN은 분산 능동 객체인 이동 에이전트 기반의 응용 시스템 개발을 위한 Java 기반의 응용 프레임워크이다. HUMAN은 파일 탐색, 그룹 어드레싱, 그리고 여정 및 탐색 대상 정보의 입력 등의 고급 유틸리티 등을 지원하고 있어, 이동 에이전트 기반의 프로그래밍에 있어서 높은 수월성을 제공하고 있으며, 주어진 네트워크 환경에 용이하게 적용하기 위해 다양한 이동 및 응답 방식들을 제공하고 있다. 또한 에이전트 등록, 해지 등을 위한 관리 서버도 제공하고 있어, 분산 정보 검색, 원격 제어 및 관리, 파일 공유 관련이 분산 응용 시스템의 개발에 효율적으로 적요할 수 있다는 장점을 가지고 있다. HUMAN 기반의 분산 응용 시스템의 예로, 간단한 물품거래 시스템이 설계, 구현되었다. Mobile agent is one of the good technologies for overcoming network load and latency in distributed applications, and it may be a promising way of base technology of distributed applications because of its high adaptability for various network environments. In this paper, a mobile agent programming system, called HUMAN, is designed and implemented efficient use in various distributed applications based on mobile agents. HUMAN supports such high level utilities as file searhing, addressing by groups of nodes, storing path information, storing search information, and thus it gives us high easiness in agent-based programming. And it provides various itinerary modes and flexible reply modes for easy adaptation to given network environment. It also provides a management server for registering and active agents. Thus it can be efficiently applied for such varous distributed applications as searching distributed information, remote control, and file sharing in networks. A simple electronic commerce system is designed is designed and implemented as a HUMAN based illustrative application.
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