무선 ATM망에서의 동적 대역폭 할당 알고리즘에 대한 QoS 성능 연구

류기훈,김지연,전광탁,양해권 군산대학교 정보통신기술연구소 2000 情報通信技術硏究論文集 Vol.4 No.-

In the network with small cell radius, a mobile terminal which has large mobility should perform frequent handover. This requires that handover mechanism must be done fastly. As cell size is smaller, signal power level is lower Handover is implemented by the network to give the users freedom of motion beyond a limited wireless coverage area while they are communication. The handover is procedure by which a user's radio link is transferred from one radio port to another through the network without an interruption of the user collection. The currently existing method for handover uses an algorithm, in which the bandwidth corresponding to the adjacent cells is supposed to be allocated. However, this method leads to the problem of requiring bandwidth allocation for many-unknown cells, due to the lack of information toward moving direction in mobile terminal. In this paper, we propose an efficient dynamic bandwidth allocation algorithm for solving those problem above, based on both path rerouting handover and soft hangover mechanism with wireless ATM. Thus, only the bandwidth for corresponding adjacent cell, that is from estimation, is chosen to be reserved; this method drastically reduces the waste of bandwidth, and improves the efficiency in performance. Comparing with static bandwidth allocation algorithm, the proposed algorithm make a bandwidth allocation more efficient. As for the QoS, it has been shown that proposed algorithm shows better performance than that with static bandwidth allocation algorithm.

임상가를 위한 외상후 스트레스 장애 척도의 신뢰도, 타당도 연구

이병용,김임,이선미,은헌정,김동인,김지연 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.3

연구목적 : 본 연구의 목적은 임상가를 위한 외상후 스트레스 장애 척도의 신뢰도와 타당도를 알아보고자 하는 것이다. 방 법 : 28명의 PTSD 군, 30명의 Non-PTSD군, 36명의 정상군에 대하여 임상가를 위한 외상후 스트레스 장애 척도를 실시하였다. 면담자간 신뢰도를 평가하기 위하여 10명의 외상후 스트레스 장애 환자를 2명의 검사자가 동시에 평가하였다. 타당도를 평가하기 위하여 모든 피검자들을 대상으로 사건 충격 척도, Beck의 우울 검사, Spielberger의 상태 특성 불안 검사 Ⅰ, Ⅱ를 시행하였다. 결 과 : Cronbach's α와 면담자간 일치도는 각각 .95와 .89였다. 임상가를 위한 외상후 스트레스 장애 척도는 각각 사건 충격 척도(r=.80), Beck의 우울 검사(r=.70), Spielberger의 상태 특성 불안 검사 Ⅱ(r=.56)와 높은 상관을 가지고 있었다. 그러나 Spielberger의 상태 특성 불안 검사 Ⅰ(r=.20)과는 상관을 보이지 않았다. 임상가를 위한 외상후 스트레스 장애 척도는 임상 진단과 82.1%의 일치도를 보였다. 결 론 : 임상가를 위한 외상후 스트레스 장애 척도는 충분한 신뢰도와 타당도를 가지고 있었다. 임상가를 위한 외상후 스트레스 장애 척도는 외상후 스트레스 장애를 진단하기에 유용한 도구라 할 수 있다. Objectives : The purpose of this study was to examine the reliability and validity of A Clinician-Administered PTSD Scale (CAPS). Methods : CAPS was administered to 28 PTSD subjects, 30 non-PTSD subjects, and 36 normal subjects, Interrater reliability for the CAPS was established by interviewing 10 PTSD subjects. The interviews were conducted by 2 interviewers simultaneously. The authors administered to all the subjects Impact of Event Scale(IES), Beck Depression Inventory(BDI), State Trait Anxiety InventoryⅠ, Ⅱ(STAI-I, Ⅱ) for measuring concurrent validity. Results : The value of Cronbach's α and interrater agreement were .95 and .89, respectively. The CAPS was highly correlated with IES(r=.80), BDI(r=.70), STAI-Ⅱ(r=.56). But the CAPS was not correlated with STAI-I(r=.20). The CAPS showed an overall agreement with clinical diagnosis of 82.1%. Conclusions : The CAPS shows a reasonable degree of reliability and validity. The CAPS could be a valuable tool to diagnose PTSD.

Poster Session : PS 0886 ; Lower GI Tract : Association Between Functional Constipation and Intake of Dietary Fiber: A Population-Based Study

( Ji Yeoun Kim ),( Young Jae Byun ),( Dong Soo Han ),( Young Ouk Ro ),( Sun Min Kim ),( Chang Soo Eun ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Backgrounds: Patients with functional constipation are often recommended to increase dietary fiber intake and overactive bladder (OAB) may be associated with bowel symptoms. We examined the associations among functional constipation, dietary fiber intake, and OAB in Korean population cohort. Methods: This cohort study, using a reliable and valid questionnaire based on the Rome III criteria was performed in Yangpyeong city, Korean community on subjects aged = 40 years between 2011 and 2012. Total, grain, vegetable, fruit and seaweed fiber intakes were estimated from dietary questionnaires. OAB was defined through overactive bladder symptom score. The associations among functional constipation, dietary fiber intake, and OAB were assessed separately by age and gender. Results: A total of 1,173 patients were enrolled, with mean age of 62.4±29.0, of which 63% was comprised of women. There were 134 (11.4%) patients with functional constipation. Total fiber intake was associated with a significantly lower prevalence of functional constipation in men, not in women. On the contrary, OAB was correlated with functional constipation in elderly women. Conclusion: Men who consumed high amount of fiber have a lower prevalence of functional constipation. OAB is associated with functional constipation in elderly women. This population-based study suggest that the pathogenesis of functional constipation may be different between men and women.

Pediatric moyamoya disease: An analysis of 410 consecutive cases

Kim, Seung-Ki,Cho, Byung-Kyu,Phi, Ji Hoon,Lee, Ji Yeoun,Chae, Jong Hee,Kim, Ki Joong,Hwang, Yong-Seung,Kim, In-One,Lee, Dong Soo,Lee, Joongyub,Wang, Kyu-Chang Wiley Subscription Services, Inc., A Wiley Company 2010 Annals of Neurology Vol.68 No.1

<B>Objective</B><P>Moyamoya disease (MMD) is a cerebrovascular occlusive disease of the bilateral internal carotid arteries that causes a compensatory abnormal vascular network at the base of brain. The rare incidence and various surgical techniques applied have limited the clinical research on MMD.</P><B>Methods</B><P>We conducted a retrospective analysis of the surgical outcome of 410 pediatric MMD patients. All patients were treated in a relatively uniform scheme at a single institution. The surgical procedures consisted of bilateral encephaloduroarteriosynangiosis augmented by bifrontal encephalogaleo-/periosteal synangiosis. Logistic regression analyses were applied to reveal the prognostic factors for surgical outcome.</P><B>Results</B><P>The overall clinical outcome was excellent in 66%, good in 15%, fair in 15%, and poor in 4% of the patients. Therefore, 81% of the patients had a favorable clinical outcome (excellent and good). Multivariate analyses revealed that infarction on presentation was associated with unfavorable clinical outcome (odds ratio [OR], 2.85; 95% confidence interval [CI], 1.49–5.46; p < 0.01) and decreased vascular reserve only on single-photon emission computerized tomography (OR, 0.07; 95% CI, 0.01–0.52; p < 0.01), with favorable clinical outcome.</P><B>Interpretation</B><P>Our results indicate that an early diagnosis and active intervention before establishment of irreversible hemodynamic change are essential to achieve a favorable clinical outcome in children with MMD. ANN NEUROL 2010;68:92–101</P>

The Analysis and Application of a Recombinant Monooxygenase Library as a Biocatalyst for the Baeyer-Villiger Reaction

( Ji Yeoun Park ),( Dong Hyun Kim ),( Su Jin Kim ),( Jin Hee Kim ),( Ki Hwan Bae ),( Choong Hwan Lee ) 한국미생물생명공학회 2007 Journal of microbiology and biotechnology Vol.17 No.7

Neurocognitive profile in children with arachnoid cysts before and after surgical intervention

Kim, Kyung Hyun,Lee, Ji Yeoun,Phi, Ji Hoon,Cho, Byung-Kyu,Shin, Min-Sup,Kim, Seung-Ki Springer-Verlag 2019 Child's nervous system Vol.35 No.3

심폐우회술시 Roller Pump 와 Centrifugal Pump 사용에 따른 혈액학적 차이

김지연,김유홍,함병문,곽미숙,김갑수,김정수,박계현 대한마취과학회 1998 Korean Journal of Anesthesiology Vol.34 No.6

Background: Prolonged extracorporeal circulation entails tremendous threats of red cell lysis, severe bleeding problems due to platelet injury and activation, and endothelial damages by sequestered leukocytes. In consideration of these problems, a new centrifugal pump was developed and tested clinically to evaluate its effectiveness. Methods : We compared the effects of a centrifugal pump with those of a roller pump on hematological responses during cardiopulmonary bypass(CPB) in 20 coronary artery bypass surgery patients. The patients were divided into two groups of 10 each. The studied parameters included WBC counts, platelet counts, plasma Hb and D-dimer. Blood samples were taken after sternotomy, at 60 min, 120 min and 180 min after CPB start, and at 2 hr after CPB stop. Results : No differences between the groups were found in bypass time, aortic cross clamp time, extracorporeal circulation flow and hematocrit. The centrifugal pump group demonstrated less platelet depletion(p<0.05), hemolysis(plasma Hb,p<0.05) and fibrinolysis(D-dimer, p<0.05). These differences were CPB time dependent and became statistically significant after 120 min bypass. Conclusions: We conclude that roller pump still can be safely used for standard cardiac procedures with bypass time less than 120 minutes and the centrifugal pump has significant potential to be safely applied to CPB for long ypass time in order to avoid postperfusion syndrome. (Korean J Anesthesiol 1998; 34: 1208∼1215)

In Vivo Evaluation of Angiogenic Activity and Its Correlation with Efficacy of Indirect Revascularization Surgery in Pediatric Moyamoya Disease

Kim, Yong-il,Phi, Ji Hoon,Paeng, Jin Chul,Choi, Hongyoon,Kim, Seung-Ki,Lee, Yun-Sang,Kang, Keon Wook,Lee, Ji Yeoun,Jeong, Jae Min,Chung, June-Key,Lee, Dong Soo,Wang, Kyu-Chang Society of Nuclear Medicine 2014 The Journal of nuclear medicine Vol.55 No.9

<P>Indirect revascularization is the most widely used treatment to induce angiogenesis in pediatric moyamoya disease (MMD). Molecular imaging methods targeted for angiogenesis have recently been developed. We performed angiogenesis imaging in indirect revascularization surgery for MMD to evaluate angiogenic activity and its correlation with treatment efficacy. <B>Methods:</B> Twelve patients with pediatric MMD were prospectively enrolled. Encephaloduroarteriosynangiosis surgery was conducted, and <SUP>68</SUP>Ga-Arg-Gly-Asp (RGD) PET was performed 3.7 ± 1.0 mo after surgery. Basal perfusion and stress perfusion (P<SUB>Str</SUB>) in the middle cerebral artery territory were evaluated by acetazolamide-stress brain perfusion SPECT using statistical probabilistic anatomic mapping, at preoperative, early postoperative, and long-term follow-up states. Angiogenic activity was assessed on the images in terms of maximal uptake ratio, volume of increased uptake, and uptake-volume product. <B>Results:</B> Basal perfusion and P<SUB>Str</SUB> were significantly improved after surgery. Increased angiogenic activity was observed in the revascularized area, mainly around the bony flap. Angiogenic activity gradually decreased with time and significantly correlated with the postoperative time interval (<I>P</I> = 0.0015 for maximal uptake ratio and 0.0069 for volume of increased uptake). It was estimated to normalize at 6.3 mo after surgery. Uptake-volume product was inversely correlated with P<SUB>Str</SUB> improvement at the early postoperative state (<I>r</I> = −0.5960, <I>P</I> = 0.0409) and also weakly correlated with P<SUB>Str</SUB> improvement at long-term follow-up (<I>r</I> = −0.5010, <I>P</I> = 0.1165). <B>Conclusion:</B> Angiogenesis PET imaging with <SUP>68</SUP>Ga-RGD was successfully used for the assessment of angiogenic activity in indirect revascularization surgery for MMD, and angiogenic activation measured at approximately 3.7 mo after surgery was inversely correlated with perfusion improvement. The assessment of angiogenic activity using <SUP>68</SUP>Ga-RGD PET is expected to be effective for evaluating the mechanism or efficacy of revascularization treatment.</P>

Low levels of total and high-molecular-weight adiponectin may predict non-alcoholic fatty liver in Korean adults

Kim, Young-Sang,Lee, Soo-Hyun,Park, Seung Geon,Won, Bo Youn,Chun, Hyejin,Cho, Doo-Yeoun,Kim, Moon-Jong,Lee, Ji Eun,Haam, Ji-Hee,Han, Kunhee Elsevier 2020 clinical and experimental Vol.103 No.-

<P><B>Abstract</B></P> <P><B>Objectives</B></P> <P>While weight gain is known as a predictor of non-alcoholic fatty liver disease (NAFLD) incidence, it remains controversial whether adipokine levels predict the development of NAFLD. We aimed to investigate the relationship of total adiponectin, high-molecular-weight (HMW) adiponectin, and leptin with the development and improvement of non-alcoholic fatty liver (NAFL) independent of sex and weight change over a maximum of 8.5 years.</P> <P><B>Methods</B></P> <P>This prospective study enrolled 2735 participants in a hospital health check-up setting. Adipokine levels were measured at baseline. NAFL was assessed with liver ultrasonography, and the development or improvement of NAFL was determined by repeated ultrasonography at follow-ups.</P> <P><B>Results</B></P> <P>Cross-sectional analyses revealed that total and HMW adiponectin levels were inversely associated with NAFL prevalence. In longitudinal analyses, the incidence of NAFL was 5.6 per 100-person-years during the observation period. The hazard ratios (HRs) per 1 μg/mL increase in the levels of total and HMW adiponectin were 0.900 (0.836–0.969) and 0.846 (0.754–0.948), respectively. Sex-stratified analyses showed that total and HMW adiponectin levels were significantly related to NAFL incidence only in women. In the subgroup of minimal weight change, only HMW adiponectin was a significant predictor for NAFL. Leptin predicted NAFL in the subgroup with weight gain. The improvement of NAFL was influenced by weight change, but not by adipokine levels.</P> <P><B>Conclusions</B></P> <P>Low levels of total and HMW adiponectin may predict the development of NAFL independent of pathophysiological factors including obesity and insulin resistance. This predictability was evident in women. Leptin was a significant predictor for NAFL in the subjects with weight gain.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low levels of total and HMW adiponectin may predict the development of NAFL. </LI> <LI> Sex difference exists in the relationship between adiponectin and NAFL incidence. </LI> <LI> Leptin may be a significant predictor for NAFL in the subjects with weight gain. </LI> <LI> Weight reduction, but not adipokines, is associated with the improvement of NAFL. </LI> </UL> </P>

Congenital solitary infantile myofibromatosis involving the spinal cord

Kim, Eun Ji,Wang, Kyu-Chang,Lee, Ji Yeoun,Phi, Ji Hoon,Park, Sung-Hye,Cheon, Jung-Eun,Jang, Young Eun,Kim, Seung-Ki Journal of Neurosurgery Publishing Group 2013 Journal of neurosurgery. Pediatrics Vol.11 No.1

<P>Infantile myofibromatosis, a rare mesenchymal disorder that develops in early childhood, is classified by the number of lesions that occur: solitary or multicentric. Involvement of the CNS is unusual in either type. Infantile myofibromatosis in the spine is exceptional, and most published cases represent a secondary invasion. Here, the authors report on an 8-month-old girl presenting with weakness below the ankle and an intraspinal mass extending from T-6 to the conus. The patient underwent only partial surgical removal of the lesion, and the pathology was confirmed as infantile myofibromatosis. After the operation, weakness in the lower extremities gradually improved; however, she could not walk at the time of the final follow-up. On follow-up MRI performed 19 months after the operation, the residual lesion remained unchanged with decreased enhancement.</P>