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東醫寶鑑 頭門 처방의 네트워크 분석을 통해 간략화한 頭部 증상의 주요 원인 및 처방
김철현,추홍민,문연주,성강경,이상관 대한한방내과학회 2017 대한한방내과학회지 Vol.38 No.6
Objectives: Head symptoms, such as headache and dizziness, are commonly presented in clinical practice. Although Donguibogam, the representative book of Korean medicine, contains many prescriptions for head symptoms, they are difficult to learn and apply because of the vast numbers. The aim of this study was to simplify and visualize the vast contents of Donguibogam by network analysis. Methods: 127 prescriptions for head symptoms, found in Donguibogam, were entered into a Microsoft office Excel 2013 file. This was used as a database for network analysis using the NetMiner 4 program. Results: Through network analysis, six networks for prescriptions for head symptoms in Donguibogam were established. The first network is similar to the herb composition of Cheongsangsahwa-tang (prescriptions for hwa-yeol syndrome). The second network is similar to the herb composition of Yanghyulgupung-tang (prescriptions for hyul-heo syndrome). The third network is similar to the herb composition of Sangcheongbaekbuja-hwan (prescriptions for dam-eum syndrome). The fourth network is similar to the herb composition of Heukseok-dan (prescriptions for yang-heo syndrome). The fifth network is similar to the herb composition of Boheo-eum (prescriptions for chil-jeong syndrome). The sixth network is similar to the herb composition of Bangpungtongseong-san (prescriptions for hwa-yeol syndrome). Conclusions: The results of the network analysis of 127 prescriptions for head symptoms in Donguibogam suggest that there are five major causes of head symptoms (hwa-yeol, hyul-heo, dam-eum, yang-heo, and chil-jeong), and that it is possible to prescribe Cheongsangsahwa-tang, Bangpungtongseong-san, Yanghyulgupung-tang, Sangcheongbaekbuja-hwan, Heukseok-dan, or Boheo-eum depending on the major causes.
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HPLC 및 신속검출방법을 이용한 우유내 Sulfamethazine 의 분석에 관한 연구
김철현,백승천,문지웅 한국식품위생안전성학회 1997 한국식품위생안전성학회지 Vol.12 No.1
Sulfonamides, a therapeutically important group of antimicrobial drugs, are widely used to treat and prevent the acute systemic and skin infections in dairy cattle. They also pose an economic hazard through inhibition of growth of dairy starter cultures. This study was carried out to compare four screening methods for detection of sulfamethazine in milk and determine the positive milk sample by HPLC method. Sulfamethazine was used to spike at five levels of sulfamethazine. The Lac-Tek test and CharmII test were also consistent better than TTCII test and Delvo SP test in sulfamethazine detection. Analysis probabilities of obtaining a positive response with TTCII test and Delvo SP test assay at 50 ppb sulfamethazine level in milk samples were only 14%, 42% each. Whereas using the Lac-Tek test and CharmII test would have resulted in 100% identification of the five levels. Determination of sufamethazine using the HPLC method in the spiked milk were 10.64, 19.30, 30.76, 38.83 and 50.23 ppb, respectively.
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중량조끼를 착용한 뇌졸중으로 인한 보행장애 환자의 즉각적인 보행 개선 효과 1례
김철현,홍해진,이상관,Kim, Cheol-hyun,Hong, Hae-jin,Lee, Sang-kwan 대한한방내과학회 2016 대한한방내과학회지 Vol.37 No.5
Objective: To confirm the immediate gait improvement in a post-stroke gait disturbance patient equipped with a weighted vest. Methods: We selected a patient who was able to walk without another’s help or with tools. The selected patient had an unstable gait because she had only started an independent gait within the past week, so we thought that a weighted vest could be very helpful for her. We first collected gait parameters using a treadmill gait analysis system while the patient walked on the treadmill without the weighted vest. After a 10-minute break, gait parameters were collected again while the patient walked on the treadmill while wearing the weighted vest. The gait parameters we collected included step length (cm), stance phase (%), swing phase (%), SW/ST, and gait line length (mm). For objective evaluation of gait improvement, we calculated the ratio of gait parameters of the right and left limbs. Results: The gait of the post-stroke patient was more symmetrical when wearing the weighted vest than without the weighted vest. Without the weighted vest, her step length ratio was 0.78, stance phase ratio was 0.88, swing phase ratio was 1.50, SW/ST ratio was 1.70, and gait line length ratio was 0.91. With the weighted vest, her step length ratio was 0.88, stance phase ratio was 0.90, swing phase ratio was 1.38, SW/ST ratio was 1.54, and gait line length ratio was 0.98. No side effects were observed due to the weighted vest.
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X.509 인터넷 공개키 기반구조에서 Kerberos 인증에 관한 연구
김철현,신광철,김창원 한국컴퓨터산업학회 2002 컴퓨터産業敎育學會論文誌 Vol.3 No.5
본 논문에서는 IETF CAT Working Group에서 발표한 PKINIT기반의 인증서비스를 향상시킨 Kerberos 인증 메커니즘을 제안한다. PKINIT기반의 X.509, DS/DNS를 적용하여 영역간의 서비스를 제공하는 인증과 키 교환 방식으로 DNS를 통해 외부영역의 위치를 탐색하고 X.509 디렉토리 인증 시스템을 적용, 영역간 인증은 DNS 서버로부터 공개키를 획득하여 다른 영역을 인증하도록 하였다. 영역간 인증과 키 교환은 Kerberos의 관용키 암호방식을 사용하고 세션 연결은 X.509 공개키 방식에 기반을 두고 있다. 효율적인 TGT(티켓승인 티켓) 교환과 티켓의 재사용으로 통신상의 Overload를 감소시키는 효과와 인증절차의 간소화를 가지는 Kerberos 시스템을 설계하였다.
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