PC 환경에서 블루투스 프로토콜 분석장비 개발

정중수 安東大學校 工業技術硏究所 2001 공업기술연구논문집 Vol.8 No.1

오늘날 무선통신 기술은 기존 유선 통신방식에 추가하여 매우 주목받고 있는 정보통신 혁명을 주도하였다. 무선 통신에서 자체 피코넷을 형성하여 음성이나 데이터 통신을 수행하는 블루투스 기술은 이제 액세스망을 통해 공중망과 접속 가능하게 되었다. 본 논문에서는 블루투스 디바이스와 UART케이블로 접속된 PC에서 블루투스 프로토콜을 분석하는 블루투스 프로토콜 분석장비 개발을 소개하였다. 이의 개발 환경으로는 윈도우 98 OS와 MS 비주얼 C를 사용하였다. 비주얼 C로 작성된 응용 프로그램은 블루투스 디바이스에 실장된 펨웨어와 인터페이스를 수행하여 개발되었다. 또한 개발된 시스템을 실제 블루투스 시스템에 적용하여 시험한 결과 만족한 성능을 제시하였다. In addition to wire technology, wireless technology has had communication revolution nowadays. Bluetooth technology carries out data/voice communication within pico-net. Nowadays the various services are supported by access network connected to public network. This paper presents implementation of bluetooth protocol analyzer which is monitoring and simulating bluetooth protocol. MS window98 and visual C are used for development environment and application program is operated over firmware loaded bluetooth device connected to the PC through UART or USB. The performance analysis of monitoring and simulation results satisfies with bluetooth device interface.

TDX-10 패킷교환시스템에서 PVC설계

정중수 安東大學校 工業技術硏究所 1994 공업기술연구논문집 Vol.1 No.1

Packet switching function has been implemented into ISDN exchange since about the rear 1980. The type of packet switched call is classified into two kinds: SVC related to the normal call procedure and PVC related to the only data transfer state. This paper presents the design procedure of the PVC based on the SVC having already been developed in the packet handler of the TDX-10 ISDN exchange.

주형을 이용한 실리카 나노구조체 합성

김효중,곽중협,서태수,서동수 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.3

나노미터 직경을 갖는 침상형의 주형(hydroxyapatite)을 이용한 새로운 접근 방법으로 실리카 나노구조체를 졸-겔법을 근간으로 합성하였다. 본 합성법은 나노전구체(실리카 피복 주형) 제조, 나노전구체 소성 및 주형제거 과정으로 구성되어 있다. 나노전구체에 대한 주사 전자현미경(SEM), 투과 전자현미경(TEM), X-선 회절 분석(XRD) 및 광전자 분광 분석(XPS) 결과를 통해 주형 표면에 실리카가 피복되어 있음을 확인할 수 있었다. 또한, 고분해능 XPS 분석에 의해 관찰되는 넓고 비대칭적인 O 1s 스펙트럼의 curve-fitting을 검토한 결과 나노전구체 표면에 여러 종류의 산소가 존재함을 보였다. 또한, 에너지 분산 X-선 분석(EDS)을 통해 나노구조체는 실리콘과 산소로 조성되어 있음을 확인할 수 있었다. 실리카 나노구조체 직경은 대부분 50-200㎚ 정도로 주형의 직경과 동일한 양상을 보였다. 이상의 결과를 통해 본 연구에서 제안한 방법이 나노구조체의 새로운 합성방법으로써 적용 가능함을 확인할 수 있었다. A novel technique for the synthesis of silica nanostructures with needle-like template, hydroxyapatite, having nanometer diameter was investigated in this study. The synthetic method consisted of the following main steps: the preparation of nanoprecursor(silica-coated templates), the calcination of nanoprecursor and the removal of templates. The analysis results of scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photo-electron spectroscopy(XPS) for nanoprecursor revealed that silica particles were deposited onto the surface of templates. Further examinations(curve-fitting processing) of the asymmetrical broadening of O 1s peaks in the XPS spectra indicate the presence of multiple oxygen species on the surface. Energy dispersive X-ray spectroscopy(EDS) result confirmed that nanostructures were composed of silicon and oxygen. The diameters of the synthesized nanostructures, mainly in the range of 50-200㎚, correspond to the diameters of the templates. The results confirm that the proposed technique in this study can be utilized as a new method to fabricate the nanostructures.

야간 혈압 변동과 좌심실 질량, 이완기 기능 및 QT 간격과의 관계

김수중,이병호,손일석,강흥선,조정휘,김권삼,송정상,배종화 대한간질학회 2003 대한간질학회지 Vol.9 No.1

LAN Monitoring에 Hijacking기법의 도입을 통한 인터넷 유해 정보로부터 사용자의 보호 시스템 개발

박형배,정중수 安東大學校 工業技術硏究所 1997 공업기술연구논문집 Vol.4 No.1

The Internet is emerging as a powerful tool in the area of information and communication technology. The WWW has been especially contributed to the increasement of the Internet demand because of its browser which has "Graphic User Interface". Nowadays number of hosts that supply harmful information such as pornographic materials, and the infringement of human rights is rapidly increased. Access to such materials is very easy. Therefore security system which will protect young users from access to harmful host is needed. This paper presents implementation of user protecting system with LAN monitoring based on hijacking method over TCP/IP network. This system has database about harmful hosts at the Internet and monitors that the user traffic over LAN get touch with the hosts. The system can not make the user access the harmful host because it can decide whether the host requested by the user is harmful or not according to monitoring the traffic over LAN.

한국인의 치아우식 조절에 관한 연구 : Ⅲ. 만경강 유역 주민의 뇨중 불소농도, 반상치 지수에 관한 연구 STUDY ON THE RELATION BETWEEN THE URINARY FLUORIDE CONCENTRATIONAND THE FLUOROSIS INDEX OF RESIDENTS IN MANKYUNG RIVER VALLEY

정동균,정태영,이종흔,김중수,오귀옥,이효재 대한구강생물학회 1980 International Journal of Oral Biology Vol.4 No.1

This experiment was conducted to elucidate the relation between the urinary fluoride concentration and the fluorosis index of residents in Mankyung River valley, especially in 3 areas (Yookang-ri, Koje·Yoochun, Shinbok·Yongkang) with high fluoride concentration in drinking water. The urinary fluoride concentration was measured by fluoride ion electrode, and dental fluorosis was surveyed and analysed by Dean and McKay's and Horowitz's method. 1. There was no reletionship between the urinary fluoride concentration and age. 2. 11-20 years age groups has revealed the highest fluofosis index. In this group : 3. There showed a parallel relationship between the fluorosis index and the urinary fluoride concentration. 4. DMF rates of residents in Yookang-ri, Koje and Shinbok are 59.2, 48.4 and 47.1%, respectively. 5. There showed a parallel relationship between the years of residence within 8 years after birth and the fluorosis index.

한국인의 치아우식 조절에 관한 연구 : Ⅰ. 치아불소증이 심한 만경강유역의 음료수내 수종 무기질 함량 Ⅰ. THE CONTENTS OF SEVERAL ELEMENTS IN DRINKING WATER OF THE HIGH DENTAL FLUOROSIS REGIONS

이종흔,정태영,김중수,이효재,민병무,정동균 대한구강생물학회 1980 International Journal of Oral Biology Vol.4 No.1

These studies were performed in an effort to elucidate the relation between dental fluorosis and several minerals which are contained in drinking water in the regions of the high fluorosis index. The water samples were collected from several regions around the Mankyung River in Chonrabukdo where high fluorosis index was observed in the pupils and from the control regions where dental fluorosis were not reported. The contents were analyzed by means of spectrophotometry for phosphorus, fluoride ion activity for fluoride, and atomic absorption spectrophotometry for calcium, magnesium and manganese. The calcium concentrations of drinking waters collected from the regions where high degree of dental fluorosis was appeared were lower than those of control regions. The phosphorus concentrations in the regions of high fluorosis index were very high, and the fluoride concentrations were remarkably greater than those of control regions. There was regional change in the magnesium concentrations of drinking water collected from the regions of the high dental fluorosis and control regions. But manganese concentrations showed markedly high regional variation.

불소 중독증의 화학적 및 구조적 연구

방성,정동균,정태영,이종흔,김중수 대한구강생물학회 1980 International Journal of Oral Biology Vol.4 No.1

Residents in areas where drinking water contains high fluoride concentration were studied in this report. Residents were examined for fluorosis index and their teeth were collected for further study. Teeth were divided into 4 groups according to the length of exposed period to high-fluoride-content drinking water and analysed for mineral contents. Dean and McKay's and Horowitz's methods were used to determine fluorosis index. Contents and concentration of calcium, phosophorus and fluoride in dental hard tissues were determined by electron microprobe with serial 17 ㎛ increment in depth. From analysis of the results of this study, it appears that : 1. 44.2% of residents in these areas were revealed to have dental fluorosis and major proportion of them had moderate degree of dental fluorosis. 2. There was no significant difference in contents of Ca, P and their ratio (Ca/P) in the whole depth of enamel. 3. Highest fluoride concentration was found in the surface portion of enamel and the content of fluoride in enamel appeared to increase with increased period of exposure to high-fluoride-content drinking water. 4. Content of fluoride was higher in cervical enamel than cuspidal enamel, but there was no difference in the content of Ca, P and their ratio (Ca/P). 5. Carious dentin contained lower content of Ca than normal dentin but fluoride concentration was very high even to the deeper portion of dentin.

메조기공의 실리카-티타니아 코겔의 제조와 자율적 조습 및 광촉매 특성

이상화,곽중협,서태수,김효중,김동표 한국공업화학회 2003 공업화학 Vol.14 No.3

수용액상의 졸겔반응에 의해 메조기공의 실리카-티타니아 코겔을 제조하고 이들의 자율적 조습력과 광촉매 특성에 대해 검토하였다. 실리카-티타니아 코겔에 있어 조습력과 관계되는 세공크기와 용적은 본 연구에서 고안된역적정법에 의해 Ph 7부근 및 SiO_2/TiO_2 비가 상대적으로 큰 9/1인 경우에 가장 큰 생성물이 얻어졌다. 폐놀 분해율에 의한 광촉매 특성은 동일조건에서 SiO_2/TiO_2 비가 감소함에 따라 증가하였고, SiO_2/TiO_2 비가 9/1에서 세공크기 4.0~6.0 nm 및 세공용적 0.6~0.8 mL/g 범위로 제어된 코겔의 경우 환경습도 40~70% 범위에서 흡습량 25%, 방습량 45%로서 종래 조습재료 보다 자율조습력이 큰 것을 볼 수 있었고, 같은 조성의 실리카-티타니아 혼합 산화물과의 폐놀 분해율에 의한 광촉매 특성 비교에서도 우수한 물성을 보이고 있었는데 이것은 Ti-O-Si 결합형성으로 인해 코겔 구조내에 음전하 과잉으로 인한 활성점(브렌스테드 산점) 발현에 기인된 것으로 고찰된다. Silica-titania cogel materials have been prepared by aqueous sol-gel process using a back titration technique designed for this study. The humidity self-control and photocatalytic properties of the materials have been also investigated. In these silica-titania cogel materials, relatively large pore size and pore volume than can give a good humidity control ability are desired, and they were synthesized under the reaction condition at pH of 7 and SiO_2/TiO_2 ratio of 9/1. The photocatalytic property, which was measured by the decomposition ratio of phenol, increased with the decrease of SiO_2/TiO_2 ratio in the composition. The cogel at the SiO_2/TiO_2 ratio of 9/1, resulted in the pore size of 4.0~6.0 nm and the pore volume of 0.6~0.8mL/g. At the relative humidity range of 40~70%, the amounts of moisture absorption and desorption were 25% 45%, respectively, and these had a better humidity control ability than conventional ones. In addition, the cogel showed a superior photocatalytic property compared to that of silica and titania mixture with the same composition. This enhancement is probably due to the revelation of active sites by the excess negative charges that were induced by Ti-O-Si bond formation in the cogel structure.

진폐증 환자에서 발생한 폐렴에서의 정주용 인 면역글로불린의 투여 효과

문제혁,정진숙,김경아,임영,남호우,한중수 大韓産業醫學會 2002 대한직업환경의학회지 Vol.14 No.2

목 적 : 진폐중환자에서 대식세포의 기능저하, 폐섬유화로 병소로의 약물 침투의 저조, 면역계의 변화가 있는 것으로 알려져 있다. 이로 인하여 폐렴치료의 어려움이 있어 중증 감염증에 효과가 있는 것으로 알려져 있는 IgG를 진폐증 환자에서 동반된 폐렴의 치료로 항생제와 함께 투여하였을 때 효과를 보고자 하였다. 방 법 : 항생제와 IgG를 함께 투여하는 투여군과 항생제만 단독 투여하는 대조군을 무작위로 선정하였다. 약물 투여전과 투여후 2·4·6·8일에 객담검사, 체온, 동맥혈산소분압, 말초혈액 백혈구와 간상중성구를 검사하여 1점부터 4점까지 점수를 부여하여 두 군간에 비교하였다. 결 과 : 투여군은 27명있었고, 대조군은 18명이었다. 두 군간에 나이, 진폐병형, 심폐기능장해도, 객담에서의 균배양여부가 유의한 차이를 보이지 않았다. 1. 이들 인자들을 고려하지 않았을 때, 투여군에서 대조군보다 임상평가 점수가 낮아지는 경향을 보였다. (p=0.083). 2. 나이가 60세 미만인 경우에는 투여군이 대조군보다 임상평가점수가 유의하게 적었다(p<0.01). 3. 단순진폐증인 대상자인 경우에는 투여군에서 대조군보다 임상평가점수가 낮아지는 경향을 보였다(p=0.077). 4. 심폐기능장해도에 따라 두 군간에 임상평가점수의 유의한 차이는 없었다. 5. 객담배양검사의 결과에 따라 두 군간에 임상평가점수의 유의한 차이는 없었다. 결 론 : 나이가 60세 미만으로 상대적으로 젊고, 단순진폐증인 경우에는 진폐증환자에서 병발한 폐렴의 치료에 항생제와 병용한 IgG의 효과가 있을 것으로 예상된다. Objectives : It is well known that pneumoconiotic patients experience impairments of macrophage function, as well as poor penetration of drugs into the fibrotic nodules and the immune system. Resultantly, pneumonia is frequently involved in pneumoconiotic patients and its treatment is not easy. Therefore, we conducted a clinical evaluation of immunoglobulin G which is known to be effective in severe infectious diseases. Methods : We randomly selected 45 pneumoconiotic patients with pneumonia and classified them into 2 groups. The experimental group (IgG group) was scheduled to receive antibiotics and igG (5 g I.V./day for 7 days). The control group was treated with antibiotics alone. Sputum gram stain (counts of WBCs and microorganisms), body temperature, arterial oxygen tension, and counts of peripheral venous blood leukocytes and band neutrophils were used as markers to assess the response effect therapy at time periods of 0, 2, 4, 6, and 8 days after completion of therapy. We compared the clinical scores between the two groups. Results : The experimental IgG treated group was composed of 27 patients, and the control group comprised 18 patients. There was no statistical differences between two groups in terms of age, pneumoconiotic profusion, impairment degree of pulmonary function, or frequency of pathogen isolation in the sputum before medication. The experimental IgG treated group showed lower clinical scores as compared with the control group (p=0.083). Conclusions : These results suggest that IgG infusion with antibiotics will have an effect on pneumonia therapy in pneumoconiosis patients that are under 60 years and exhibit simple pneumonoconiois.