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Diphenylhydantoin 투여중 발생한 용혈성 빈혈을 동반한 순수 적혈구 형성 부전증 1 예
장동섭(Dong Seob Jang),김순혜(Soon Hye Kim),최민준(Min Joon Choi),인현호(Hyun Ho In),박재후(Jae Who Park),윤혜령(Hye Ryoung Yoon),김진주(Jin Ju Kim) 대한내과학회 1994 대한내과학회지 Vol.46 No.2
Pure red cell aplasia is an uncommon disease characterized by findings of abscence of reticulocytes in the peripheal blood, and abscence of erythroblasts and normal leukocytes and platelet production in the marrow. Its cause and mechanism is obscure but immunologic mechanism is strongly suggested because of the wide variety of immunologic abnormalities and successful treatment with immunosuppressive agents. A 34 year-old female was admitted to our hospital due to general weakness, dizziness and dark-colored urine. She was taking diphenylhydantoin against epilepsy. The peripheral blood smear and bone marrow examination showed normocytic normochromic anemia reticulocytopenia, marked hypoplasia of the erythroid series, and the hematologic and urinary examination showed severe hemolytic evidence. After diphenylhydantoin withdrawal and steroid therapy, the hemolytic anemia and red cell aplasia recovered completely. We are reporting a patient with diphenylhydantoin induced pure red cell aplasia with simultaneous occurrence of hemolytic anemia following administration of diphenylhydantoin with brief review of literature.
무선 센서 네트워크에서 효율적인 멀티캐스트 라우팅 프로토콜
장동섭 ( Dong-seob Jang ),조인휘 ( In-whee Joe ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.1
초기 센서 네트워크의 라우팅 프로토콜은 데이터를 수집하는 업링크 위주의 알고리즘이었다. 그러나 최근에는 특정 노드를 제어하기 위해 토폴로지 정보를 관리하고, 이를 바탕으로 하는 다운링크 알고리즘이 연구되고 있다. 또한 동시에 다수의 노드에게 질의를 전송하는 멀티캐스트 알고리즘의 필요성이 대두되고 있으나 현재까지 센서 네트워크에 적용할 만한 멀티캐스트 라우팅 프로토콜은 거의 전무한 실정이다. 본 논문에서는 비교적 리소스 제한이 적은 게이트웨이나 싱크에서만 관리하던 라우팅 테이블을 메모리가 작은 일반 센서 노드에서도 관리할 수 있게 충분이 작은 비트맵형 라우팅 테이블의 구성을 제안하고, 이를 이용하여 효율적인 유니캐스트 및 멀티캐스트 라우팅 프로토콜을 제안한다. 제안된 프로토콜은 멀티캐스트상황에서 불필요한 포워딩을 제거함으로써 네트워크 내의 패킷 발생량을 최소화시켜 주는 매우 효율적인 방식이다. 또한 라우팅 테이블의 유지 및 관리가 수월하여 센서 노드에서의 데이터 처리 부담을 줄였다.
장동섭(Jang, Dong Seob),박철민(Park, Chul Min),박대경(Park, Dae Kyong) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.9
For the evaluation of acoustic noise of a DLP projector, vibration and sound characteristics of a DLP projector were studied. The acoustic noise of DLP projector could be classified into three categories, that is, the direct noise from a body of rotation, the air-bone noise generated from turbulence or vortex occurred during cooling process and the structural born noise produced by vibrating elements. Cooling fans and color filter wheel which rotates at 9000 rpm are main causes of acoustic noise induced in DLP projector. Since the structure of an optical module in a DLP projector can be excited by the excessive vibration of a color filter wheel, the structural design for anti-vibration should be considered. To make a reduction of overall acoustic noise, the anti-vibration design and the enclosing structure have been studied and applied to a color filter wheel.
디스크 드라이브용 VCM 액추에이터의 전력 소모와 감도비에 관한 연구
김선모(Kim, Sun-Mo),장동섭(Jang, Dong-Seob),윤진욱(Yoon, Jinwook) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
In this paper, the explicit equations on the power consumption and sensitivity ratio of VCM-type actuator for disk drive are proposed. The power consumption and sensitivity ratio is derived in frequency domain. The power consumption during the track following of the actuator can be described well in frequency domain and it can be used to calculate the total power dissipation of the actuator which is needed to compensate the tracking and focusing errors. Also, the sensitivity ratio of an actuator is derived by using the reference servo of a disk drive and will be used to optimally obtain the performances of the actuator. This sensitivity ratio can persuasively explain the basis of the target performances of the actuator in the considerations of the reference servo. The usefulness of the proposed equations for the sensitivity ratio and power consumption of an actuator is shown by a lot of simulations. In the near future, we will verify the simulation results by experiments.
담즙의 농축화와 산성화가 담석형성에 미치는 영향에 관한 연구
문태훈(Tai Hoon Moon),이기훈(Ki Hoon Lee),이진우(Jin Woo Lee),장동섭(Dong Seob Jang),신용운(Yong Woon shin),김영수(Young Soo Kim),김원곤(Won Gon Kim),김경래(Kyung Rae Kim) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.3
N/A Background/Aims: The most recognized function of the human gallbladder(GB) is to store bile. However, this organ is not a static reservoir. It actively modifies bile by the double process: concentration and acidification. This study was designed to compare solute composition in GB bile between patients with and without gallstones and to evaluate the effects of concentration and acidification of GB bile on cholesterol and calcium solubility. Methods: Bile was sampled directly from the GB of fifteen patients with gallstones(gallstone group) and of fourteen patients undergoing laparotomy for reasons unrelated to hepatobiliary disease(control group). In the bile, we measured electrolytes, pH, pCO, protein, cholesterol, phospholipid, and bile salt. And then, we calculated the cholesterol saturation index(CS1) by using the critical table of Carey and the CaCO saturation index(CaCO Sl) by using metbods of Rege and Moore. Results: The pH was significantly higher in gallstone group. The bile salt concentration was significantly )ower in gallstone group. In between the two groups, total protein concentration were not significantly different. The CSI and CaCO SI were higher in gallstone group, but were not significantly higher than in control group. There was no significant correlation between pH and bile salt concentration, but a significant correlation was found between pH and CaCO Sl. There was also no significant correlation between pH and bile salt concentration, CSI and bile salt concentration, and pH and CSl, respectively. Conclusions: Failure of concentration and acidification of bile was found in patients with gallstones. Concentration and acidification of bile were independent processes. Acidification of bile prevents gallstone formation by increasing calcium salt solubility. (Korean J Gastroenterol 1995;27:338 - 344)
적외선 및 원자 흡수 분광법에 의한 담석의 성분 분석과 담석 비중의 유용성에 관한 연구
이진우(Jin Woo Lee),문태훈(Tai Hoon Moon),송준호(Jun Ho Song),장동섭(Dong Seob Jang),박기수(Gi Soo Park),정석(Seok Jeong),조영업(Young Up Cho),김경래(Kyung Rae Kim) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.4
N/A Background/Aims: Recent reports show a tendency of higher incidence of cholesterol gallstones in Korea. 1t is well known that the compositional difference of gallstones is not only affected by the different geographic areas, but also depen<l on dietary and living habits. Measurement of tbe cholesterol content of gallstones facilitates investigations into the etiology, treatment, and prevention of gallstone disease. However, current procedures for determination of gallstone cholesterol content require expensive instrumentation and reagents which may not be readily available. The purpose of this study was to elucidate the influence of regional difference on the incidence of the different types of gallstones and the usefulness of gallstone density for measurement of the cholesterol content of gallstones, especially in satellite cities. Methods: We analyzed the gallstones from 26 gallstone patients who were operated in Inha University Hospital from March 1994 to November 1994. Each stone was evaluated with infrared and atomic absorption spectroscopy, and the gallstones from 20 patients were sampled for the determination of gallstone density. Results: The major type of gallstones was cholesterol stone(46.2%), followed by calcium bilirubinate stone(38.5%), calcium phosphate stone(11.5%) and calcium carbonate stone (3.8%), We obtained a high inverse correlation between the percentage of gallstone cholesterol content and gallstone density(r=-0.91, p -. 0.05). Conclusions: The major type of gallstones in Korea at satellite cities is cholesterol stone. Our results show that significant discrimination between gallstones of varying cholesterol content can be achieved by a simple determination of gallstone density. (Korean J Gastroenterol 1995;27:450 - 456)