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Data Addressing 방법을 사용한 동기 BPSK DS/CDMA 시스템
金翰均,金南善 대진대학교 정보통신연구소 1999 정보통신 논문집 Vol.2 No.-
본 논문은 정보에 따라 확산부호를 할당하는 방법을 사용하는 동기 BPSK DS/CDMA 시스템에서 발생하는 다중접속간섭을 제거시키기 위한 시스템을 제시한다. CDMA 시스템에서 사용자 신호의 주파수대역을 확산시키기 위한 확산부호로 Simplex 부호를 사용하며, 이러한 부호를 사용자의 정보에 따라 할당한다. 본 연구에서는 Simplex 부호를 확산부호로 사용한 DS/CDMA 시스템에서 발생하는 다원접속간섭을 제거할 수 있는 간섭제거모델을 제시한다. AMGN 환경하에서 임의의 사용자에 의해서 발생하는 간섭을 해석하고, 동일 사용자 측면에서 일반 수신기와 성능을 비교한다. This paper presents a system to cancel the multi-user interference of synchronous BPSK DS/CDMA systems. In the code-division multiple access(CDMA) scheme, the spectrum of the uster's signal is directly spreaded by means of the Simplex code. And the different Simplex codes are assigned by user's imformation bits. This thesis presents a interference cancellation model to cancel the multi-user interference in DS/CDMA systems by using Simplex codse as a spreading sequence. In AWGN environment, we analyze interence generated from other users and compare the resulting performance with that of the conventional receiver
못총에 의한 두부총상의 뇌정위적 수술 치험례 : 증례보고 Case Report
박한준,김영태,서면,하호균 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.9
The authous report a rare case of gunshot injury to the head by a nail-gun which was treated by stereotactic surgery. In the case a 23-year-old male patient, presented with semicomatose mentality and decerebrated rigidity. The large nail was located in the 3rd ventricular area in the mid-line with vertical stature. The entry point was identified 1㎝ anterior to the coronal suture line and just lateral to the sagittal suture line. The foreign body was removed stereotactically with the guidance of fluoroscope. But he died of initial severe brain damage.
권은정,배한익,이태균 동국대학교 경주대학 1996 東國論集 Vol.15 No.-
Endometriosis is characterized by ectopic growth of tissue resembling endometriosis in various extrauterine locations. So we surgically implanted endometrial tissue to serosal wall of small intestine in rats. After that we administrated Naemak-1-ho-hwan for 10, 20, 40, 60, 80, 100 days. The results were as follows: 1. After 4weeks we could observe tissue resembling endometrium in serosal wall of small intestine. Endometrial tissue which was located serosal wall of intestine had the function of growing, secreting and bleeding. 2. The size of the endometrial tissue in the Naemak-1-ho-hwan administrated group was significantly reduced when we compared with water administrated group (control group) . Further more, as the time goes on, the effect of Naemak-1-ho-hwan much better. 3. In case of infected group, we could find abscess and fibriotic change, also like that case Naemak-1-ho-hwan was not effect. 4. There was no difference between Naemak-1-ho-hwan administrated group and control group in the shape of primordial follicle, primary follicle, maturing primary follicle and ovary size. So these results suggest that Naemak-1-ho-hwan will be effect for the patient who suffer from slight endometriosis.
조남규,김현국,권기환,한창수,안유민,이성환,박균명 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
This paper describes the statistical analysis techniques for the surface roughness assessment of polished surfaces. In experiments, the polishing process of the sample surfaces which are manufactured by ball end mill is consist of two steps; the cusp removal process and the surface finishing process. For the cusp removal process, the criterion of cusp removal was established from the power spectrum analysis to assess the change of the cusp removal rate. For the finishing process, the surface was polished by the rotational CBN tool and vibration wood tool. And the surface quality of polished surface was assessed using the functional parameters based on the statistical values of surface profiles. Consequently, the surface finish performance of the polished surface using the vibration wood tool was improved.
Actinobacillus sp. EL-9로부터 생산된 생분해성 폴리에스터의 구조 및 특성
손홍주,이건,김근기,김한수,김용균,이상준 부산대학교 유전공학연구소 1998 분자생물학 연구보 Vol.14 No.-
Actinobacillus sp. EL-9로 부터 추출, 정제된 PHB를 GC, IR 및 NMR로 분석한 후, 그 구조를 확인하였으며, 열적 성질, 점도 및 분자량 등을 검토하였다. Actinobacillus sp. EL-9로부터 추출, 정제된 PHB를 IR,500㎒ ^1H-NMR 및 125㎒ ^13C-NMR 를 이용하여 조성분석을 실시한 결과, 본 공시균이 생산한PHB는3-hydroxybutyric acid 의 homopolymer임을 알 수 있었다. 또한 PHB의melting temperature(T_m)은 169.7℃임을 알 수 있었으며, crystallization trmperature(T_c)는 69.13℃이었다. PHB의 점도는 1.08×10^6(±3,000)이었다. In this study, the composition and characteristic of poly-β-hydroxybutyrate(PHB) biosynthesized by Actinobacillus sp. EL-9 are investigated. PHB produced by Actinobacillus sp. EL-9 was identified as the homopolymer of 3-hydroxybutyric acid(PHB)by infrared spectroscopy and nuclear magnetic resonance spectroscopy analysis. The melting temperature(T_m), and crystallization trmperature(T_c)of PHB was 169.7℃ and 69.13℃, respectively. the viscosity on the basis of Brookfield viscometer was 6.01㎗/g. The viscosity-average molecular weight estimated by Mark-Ho-wink-Sakurada equation was 1.08×10^6(±3,000).
Exploring Open Innovation Metrics Based on Absorptive Capacity Theory
Han-Gyun Woo,Young Sim Yoon 한국경영과학회 2010 한국경영과학회 학술대회논문집 Vol.2010 No.6
본 연구에서는 Absorptive Capacity와 개방형 혁신(Open Innovation) 간의 관계를 고찰하고자 한다. 최근 오픈 이노베이션은 기업의 혁신 전략으로서 각광을 받고 있으며, 이미 다수의 기업과 연구소에서 성공적으로 실행되고 있다. 그러나 R&D 조직에서의 실제 오픈 이노베이션의 결과와 기대치는 일정 정도 차이를 보이고 있는데, 이는 오픈 이노베이션 활동의 성과를 측정하는데 많은 혼란이 존재하기 때문이다. Cohen과 Levinthal(1990)은 외부 지식을 목적의식적으로 받아들이고 이를 내재화 하는 기업의 혁신능력을 설명하기 위해 Absorptive Capacity라는 개념을 제시하였다. 본 연구에서는 이 이론을 이용하여 오픈 이노베이션 활동의 성과를 측정하기 위한 지표 설계 프레임워크와 초기 연구단계의 방법론을 제시한다.