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패킷 손실원인 구분을 바탕으로 한 유무선 혼합망에서의 TCP 우호적 전송률 제어
박정규,신성환,정충교 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-
Conventional TCP is not suitable for multimedia streaming applications due to its abrupt changes in the sending rate UDP has been the solution to this problem. However UDP does not respond to the network congestion and thus incurs a severe fairness problem in the network. TCP-Friendly Rate Control (TFRCC) was proposed to substitute UDP. We propose, in this paper, a modified TFRC that can be used in wire-cum-wireless environments without performance degradation under heavy transmission errors in the wireless link We used "spike" phenomenon to distinguish losses due to congestion and due to transmission errors in the wireless link.
펄스 코로나 방전 반응기를 이용한 NOx 제거 효율 및 입자 성장 분석
박정환,김동주,김교선 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B
In this study, we analyzed the NOx removal efficiency and particle size distribution by the pulsed corona discharge process and investigated the effect of several process variables. The NO removal efficiencies and the particle characteristics were measured and analyzed as the function of initial concentrations of NO, H2O and NH3, applied voltage, pulse frequency and residence time. As the frequency of applied voltage increases, or as the applied voltage increases or as the residence time increases, the NO removal efficiency increases. The change of initial NH3 and H2O concentrations do not affect the NO removal efficiency significantly. The particle concentration and size increases with the increases of initial NO concentration, residence time and applied voltage.
저온 플라즈마 공정에 의한 NO_x 제거시 공정 변수의 영향
박정환,김동주,김교선 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.A
In this study, we analyzed the NOx removal effiency by the low temperature plasma process and investigated the effect of several process variables. Most of NO is converted into NO2 and, later, into HNO3 which reacts with NH3 to form NH4NO3 particles. As the frequency of appling voltage increases, as the applied voltage increases or as the residential time increases, removal efficiency of the NO supplied initially increase. The removal efficiency of NOx also increases with the increase of NH3 supplied.
노환중,정인교,양동규,김태규,김종렬 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.3
Sonoring is caused by the repeated obstructions of versatile upper air way structure during sleep and is known as a kind of disease entity varing from simple snoring to obstructive sleep opnea syndrome(OSAS) which can cause serious cardiopulmonary complications due to its hypoxic pathophysiology. It has been reported that over 30% of middle-aged person have the problems of snoring and its accompanied symptomes and signs. Cephalometric measurements, frequently used to measure sella-nasion-subspinale(SNA) and sella-nasion-supramentale(SNB) angles, can provide the informations about the posterior airway space(PAS), the mandibular plane(MP) and the position of hyoid bone. These informations are useful in determining the therapeutic modalities of the snoring and OSAS patients. However, with conventional routine upright position, it does not represent the actual images of obstructive mechanism during sleep but only show the images of awaken normal upper airway anatomy. Therefore we have taken dual images of a routine upright lateral and a supine cephalometric view to compare both.
증례 : 소화기 ; 내시경적 보툴리눔 독소 주입으로 치료한 윤상인두근이상증 1예
정교태 ( Kyo Tae Jung ),최홍규 ( Hong Kyu Choi ),이기병 ( Ki Byung Lee ),유정환 ( Jung Hwan Yu ),김지현 ( Jie Hyun Kim ),박윤길 ( Yoon Ghil Park ),이상인 ( Sang In Lee ) 대한내과학회 2010 대한내과학회지 Vol.79 No.3
보툴리눔 독소는 아칼라지아, 당뇨병성 위마비, 오디괄약근 장애, 만성 항문치열 등 다양한 소화기 질환에 사용되고 있다. 윤상인두근 기능이상은 이전에는 기계적 풍선 확장술이나 윤상인두근 절제술로 치료하였으나, 최근 윤상인두근 내 보툴리눔 독소 주입에 의해 안전하고 효과적으로 치료될 수 있음이 보고되고 있다. 본 환자는 뇌졸중에 의한 윤상인 두근 장애로 연하곤란을 호소하였으며, 내시경적 보툴리눔 독소주입 이후 호전을 보였기에 이를 보고하는 바이다. Botulinum toxin has been used to treat various gastrointestinal tract diseases such as achalasia, diabetic gastroparesis, sphincter of oddi dysfunction, and chronic anal fissures. Recently, it has also been used for the treatment of cricopharyngeal muscle dysfunction. Several studies have reported that botulinum toxin injections may be a safe and effective treatment. Previously, cricopharyngeal muscle dysfunction was treated by mechanical balloon dilation or cricopharyngeal myotomy. Here, we report a case of a 57-year-old man who presented with cricopharyngeal dysphagia due to cerebral infarction and who was successfully treated with endoscopic botulinum toxin injection. (Korean J Med 79:301-305, 2010)
Survivorship of the bean bug, Riptortus clavatus, fed on seed extract fractions of amungbean variety
Jin Kyo Jung,Bo-Yoon Seo,Jung-Kyung Moon,Ja-Hwan Ku 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
To isolate plant insecticidal factors, a series of survivorship tests were conducted using artificial diets mixed with seed extract of a mungbean variety (Vigna radiata), which gave a high mortality to the bean bug, Riptortus clavatus. Seed flour was extracted with methanol and ethanol solutions, and then the crude extract was first fractionated with layers of ether, n-butanol and water in solvent/solvent partition. Layers of ether and n-butanol fractions showed insecticidal effects to the bean bug, respectively. The n-butanol fraction was further isolated with several fractions on a reversed-phase column chromatography, and its 100% methanol fraction showed a high insecticidal effect. The fraction was further isolated on a normal-phase column chromatography, and the 70% methanol fraction showed the highest insecticidal effect. The final fraction was analyzed and fractionated on a reversed-phase HPLC. The active isolates were almost insoluble in any organic solvents and did not show any absorption in ultra-violet and visible light wavelength range. On the other hand, the ether fraction of crude extract was isolated on a normal phase column chromatography, and its hexane fraction showed the activity. The hexane fraction was further isolated on a reversed-phase HPLC and tested for the survivorship of the bean bug.
증례 : 소화기 ; 복강 내 종양으로 오인된 농양을 형성한 위궤양 천공 1예연세대학교 의과대학 강남세브란스병원 1소화기내과, 2영상의학과
유정환 ( Jung Hwan Yu ),장성일 ( Sung Ill Jang ),박정수 ( Jung Soo Park ),정교태 ( Kyo Tae Jung ),김주희 ( Joo Hee Kim ),김자경 ( Ja Kyung Kim ),이관식 ( Kwan Sik Lee ) 대한내과학회 2011 대한내과학회지 Vol.81 No.1
저자들은 복강 내 종양 의심 환자에서 위궤양 천공에 의한 복강 내 농양을 진단하고 약물치료만으로 완치된 예를 경험하여 이를 문헌고찰과 함께 보고하는 바이다. Gastric ulcer perforation usually results in panperitonitis, which requires surgical treatment. A peritoneal abscess also can occur with gastric ulcer perforation, but it is not a common complication of peptic ulcer disease. Here, we report a peritoneal abscess that mimicked a tumor and was caused by a gastric ulcer and provide a literature review. A 57-year-old woman was admitted to our hospital for evaluation of an abdominal mass found in another hospital, with no signs of infection. She underwent a left lobectomy of the liver due to choledocholithiasis. Abdominal computed tomography (CT) revealed a heterogeneous mass attached to the antrum of the stomach. At endoscopy, we confirmed that the gastric ulcer at the antrum of the stomach caused the abscess. After 4 weeks of antibiotics and proton pump inhibitor treatment, she was cured. In a patient with abdominal pain and a peritoneal abscess of unknown cause, the possibility of peptic ulcer perforation should be considered. (Korean J Med 2011;81:89-92)
사관생도의 개인적 특성에 따른 신체적 자기지각과 운동 몰입의 관계
정승교 ( Seung Kyo Jung ),정승환 ( Seung Hwan Jung ) 한국스포츠심리학회 2011 한국스포츠심리학회지 Vol.22 No.3
본 연구는 육군사관학교 생도들의 학년, 동아리 활동, 체력등급에 따른 신체적 자기지각과 운동 몰입의 차이를 검증하고 두 요인의 관계를 검증하는 데 목적이 있다. 본 연구에는 인구통계학적 특성과 운동몰입 수준, 신체적 자기지각을 조사하기 위한 질문지를 대상에 맞게 수정·보완하여 사용하였다. 수집된 자료를 대상으로 SPSSWIN 12.0를 이용한 다변량분석과 중다회귀분석을 실시한 결과, 학년에 따른 신체적 자기지각은 하위요인 중 매력적인 몸매에서, 운동 몰입에서는 인지몰입에서 유의한 차이가 나타났다. 동아리 활동 형태에 따른 신체적 자기지각은 스포츠 유능감, 매력적인 몸매, 체력의 영역에서, 운동 몰입은 인지몰입과 행위몰입 전 요인에서 유의한 차이가 나타났다. 또한 체력등급에 따른 신체적 자기지각은 모든 하위요인에서 유의한 차이가 나타났으며, 운동 몰입은 인지몰입 요인에서 유의한 차이가 나타났다. 또한 신체적 자기지각과 운동 몰입 간의 관계 연구에서는 인지몰입과 행위몰입에 신체적 자기지각의 하위요인 스포츠 유능감, 신체적 컨디션이 정적인 영향을 미치는 것으로 나타났다. The purpose of this study was to verify the difference of physical self-perception and sport commitment according to cadet`s grade, circle activities, and strength grade and verify the relationship between the two factors. In the study, the questionnaire for figuring out demographic traits, the level of sport commitment, and physical self-perception was modified for the intended subjects. As the result of conducting multivariate analysis of variance and multiple regression analysis on collected data using SPSSWIN, in case of physical self-perception according to grade showed a significant difference in attractive body shape among the sub-factors and sport commitment showed a significant difference in cognitive commitment. Physical self-perception according to circle activities showed a significant difference in sports ability, attractive body shape, and strength and sport commitment showed a significant difference in cognitive and behavioral commitment. Also, physical self-perception according to strength grade showed a significant difference in all the sub-factors and sport commitment showed a significant difference in cognitive commitment. Moreover, The study on causal relationship between physical self-perception and sport commitment revealed that the sub-factors of physical self-perception such as sports ability and physical condition had an impact on cognitive and behavioral commitment.