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고체추진 로켓모터의 지상연소시험시 발생되는 진동현상에 관한 연구
김준엽,장성조,김도영 대한기계학회 1993 대한기계학회논문집 Vol.17 No.9
Many items, as internal pressure, thrust, temperature, strain, etc. are measured in Ground Firing Test (GFT) of rocket motors. But these items are influenced by various phenomena occurred during propellant combustion. In this study, natural frequencies of motor itself and system(motor+loadcell) on Stand were measured. Also motor responses were measured during burning and analyzed so that the vibration characteristics occurred during GFT and the causes and characteristics of vibration signal appearing on thrust curve were identified.
(t, n) 임계치 기법을 이용한 센서네트워크에서의 공개키 인증
김준엽,김완주,이수진,Kim, Jun-Yop,Kim, Wan-Ju,Lee, Soo-Jin 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.5
Earlier researches on Sensor Networks preferred symmetric key-based authentication schemes in consideration of limitations in network resources. However, recent advancements in cryptographic algorithms and sensor-node manufacturing techniques have opened suggestion to public key-based solutions such as Merkle tree-based schemes. These previous schemes, however, must perform the authentication process one-by-one in hierarchical manner and thus are not fit to be used as primary authentication methods in sensor networks which require mass of multiple authentications at any given time. This paper proposes a new concept of public key-based authentication that can be effectively applied to sensor networks. This scheme is based on exponential distributed data concept, a derivative from Shamir's (t, n) threshold scheme, in which the authentication of neighbouring nodes are done simultaneously while minimising resources of sensor nodes and providing network scalability. The performance advantages of this scheme on memory usage, communication overload and scalability compared to Merkle tree-based authentication are clearly demonstrated using performance analysis.
2형 신경섬유종증에서 양측 소뇌다리뇌각종양으로 인한 양측 전정병증
김준엽,남정무,한정호,김지수 대한신경과학회 2010 대한신경과학회지 Vol.28 No.1
Bilateral vestibulopathy (BV) is characterized by oscillopsia and imbalance during locomotion. Half of the cases of BV are idiopathic, and BV due to brain tumor has been reported only rarely. We report a case of BV due to bilateral cerebellopontine-angle tumors in a patient with neurofibromatosis type 2. Careful history on oscillopsia and imbalance during locomotion, and regular follow-ups using the head-impulse test and dynamic visual acuity are warranted in patients with neurofibromatosis type 2.
김준엽,이창훈,강준명,조진희 대한이비인후과학회 2008 대한이비인후과학회지 두경부외과학 Vol.51 No.1
We report a case of intrasellar arachonoid cyst with extension to the sphenoid sinus, which is a very uncommon lesion. Preoperatively, we studied the PNS CT & Brain MRI and these images showed a large cyst in the widened sellar turcica with extension to the sphenoid anterior wall. We planned endoscopic surgery via transnasal-transphenidal approach. The endoscopic surgery was performed with no complication. We reviewed the literature and discussed the treatment of the intrasellar arachnoid cyst. (Korean J Otorhinolaryngol-Head Neck Surg 2008;51:95-8)
Risk Factors of a Pulmonary Thromboembolism After Colorectal Surgery
김준엽,배병노,정현석,박인석,조현진,곽금희,김기환,김홍주,김영덕 대한대장항문학회 2015 Annals of Coloproctolgy Vol.31 No.5
Purpose: Previous studies have revealed that predictors and risk factors of pulmonary thromboembolism (PTE) are malignancy, immobilization, diabetes, and obesity in the postoperative patients. However, in patients undergoing colorectal cancer, studies of PTE have not been enough. Thus, we investigated the risk factors of PTE related to colorectal surgery. Methods: From January 2009 to October 2014, 312 patients received colorectal surgery without other organ resection. The postoperative patients with PTE were 14 (4.5%), and they were classified by sex, age, and stage as a 1:3 paired match to the control group. A multiple logistic regression was performed to identify which factors were associated with PTE. Results: One patient was in stage I, 3 in stage II, 9 in stage III, and 1 in stage IV. In the binary logistic regression analysis, history of diabetes mellitus (odds ratio, 6.498; P = 0.031) and being overweight (odds ratio, 10.018; P = 0.014) were independent risk factors for PTE in patients undergoing colorectal cancer. Conclusion: A history of diabetes mellitus and being overweight were independent risk factors of PTE after colorectal cancer.