• Journal of the Institute of Electronics Engineers of Korea TC
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• 제47권11호
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• pp.59-68
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• 2010

In this paper, we present a new method to complete Dynamic Spectrum Access by modifying the reward function. Partially Observable Markov Decision Process (POMDP) is an eligible algorithm to predict the upcoming spectrum opportunity. In POMDP, Reward function is the last portion and very important for prediction. However, the Reward function has only two states (Busy and Idle). When collision happens in the channel, reward function indicates busy state which is responsible for the throughput decreasing of secondary user. In this paper, we focus the difference between busy and collision state. We have proposed a new algorithm for reward function that indicates an additional state of collision which brings better communication opportunity for secondary users. Secondary users properly utilize opportunities to access Primary User channels for efficient data transmission with the help of the new reward function. We have derived mathematical belief vector of the new algorithm as well. Simulation results have corroborated the superior performance of improved reward function. The new algorithm has increased the throughput for secondary user in cognitive radio network.

• Clinical and Experimental Reproductive Medicine
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• 제21권1호
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• pp.13-20
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• 1994

Status of endometrium is a very important factor which influences the implantation of fertilized embryos. In this study, we evaluated the possibility that the endometrial depth and pattern assessed by vaginal sonography on the day of human chorionic gonadotropin (HCG) injection in in vitro fertilization (IVF) cycles could be used to predict the IVF outcome. A total of 112 cycles using gonadotropin releasing hormone agonist (GnRHa) for ovulation induction were evaluated. We classified all patients into group A(<9mm) or group B(${\geq}$ 9mm) according to endometrial depth, and into group l(hyperechogenic), group 2(isoechogenic) or group 3(hypoechogenic and triple line) according to endometrial pattern. The other classification was made considering both endometrial depth and pattern. There was no significant correlation between serum estradiol level and endometrial sonographic findings(depth and pattern)(p>0.05). The pregnancy rate of group A(31.3%) did not differ significantly from that of group B(43.7%), but no pregnancies were found in any patients with endometrial depth less than 6mm. The pregnancy rate was 40%, 35.7%, and 44.6 % for group 1, gorup 2, and group 3, respectively, but there was no statistically significant difference between these groups(p>0.05). In combined classification, there was a trend of higher pregnancy rate in case of endometrial depth greater than 9mm and hypoechogenic triple line pattern, but there was no statistically significant differences between these groups(p>0.05). The conclusion from the present data is that endometrial ultrasonography on the day of hCG administration had no predictive value for conception in IVF cycles.

• Asian Pacific Journal of Cancer Prevention
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• 제15권3호
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• pp.1187-1192
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• 2014

Background: To correlate breast cancer subtypes with prognostic factors, microvessel density (MVD), vascular endothelial growth factor (VEGF) expression and clinical features. Materials and Methods: One hundred cases of primary breast carcinoma were classified using biomarkers on tissue microarray as: luminal A [estrogen receptor (ER)+, HER2-, $Ki-67{\leq}14%$], luminal B [ER+, HER2+ or ER+, HER2-, Ki-67>14%], HER2, triple negative basal-like (TNB) [any basal cytokeratins (CKs, 5, 14, 17) and/or endothelial growth factor receptor (EGFR) expression], and TN without such markers [TNN, null], and assessed for p53, vimentin, VEGF and CD31 immunoperoxidase. Results: Of the 100 cases (mean age, 51 years; mean tumor size, 3.2cm; 56% with nodal metastasis; 89 invasive ductal carcinomas, not otherwise specified, 4 invasive lobular carcinomas, 3 metaplastic carcinomas, and 4 other types) there were 39 luminal A, 18 luminal B, 18 HER2, 15 TNB and 10 TNN. The positivities of basal-like markers in the basal-like subtype were 78.3% for CK5, 40% for CK14, 20% for CK17, 46.7% for EGFR. There was no significant difference in age distribution, tumor size, degree of tubular formation, pleomorphism, lymphovascular invasion, nodal metastasis, MVD, VEGF expression and survival among subgroups. TNs demonstrated significantly higher tumor grade, mitotic count, Ki-67 index, p53 and vimentin and decreased overall survival compared with nonTN. Conclusions: The distribution of breast cancer subtypes in this study was similar to other Asian countries with a high prevalence of TN. The high grade character of TN was confirmed and CK5 expression was found to be common in our basal-like subtype. No significant elevation of MVD or VEGF expression was apparent.

• Asian Pacific Journal of Cancer Prevention
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• 제15권22호
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• pp.9627-9630
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• 2014

Background: Although efficacy of aprepitant for suppressing emesis associated with single-dose cisplatin has been demonstrated, there are limited data on the antiemetic effect of this oral neurokinin-1 receptor antagonist during daily administration of cisplatin. Accordingly, we investigated the efficacy and safety of aprepitant in patients with head and neck cancer (HNC) receiving combination therapy with cisplatin and 5-FU (FP therapy). Materials and Methods: Twenty patients with HNC were prospectively studied who received a triple antiemetic regimen comprising granisetron ($40{\mu}g/kg$ on Days 1-4), dexamethasone (8 mg on Days 1-4), and aprepitant (125 mg on day 1 and 80mg on days 2-5) with FP therapy (cisplatin $20mg/m^2$ on days 1-4; 5-FU $400mg/m^2$ on days 1-5) (aprepitant group). We also retrospectively studied another 20 HNC patients who received the same regimen except for aprepitant (control group). Results: For efficacy endpoints based on nausea, the aprepitant group showed significantly better results, including a higher rate of complete response (no vomiting and no salvage therapy) for the acute phase (p=0.0342), although there was no marked difference between the two groups with regard to percentage of patients in whom vomiting was suppressed. There were no clinically relevant adverse reactions to aprepitant. Conclusions: This study suggested that a triple antiemetic regimen containing aprepitant is safe and effective for HNC patients receiving daily cisplatin therapy.

• Journal of Korean Neurosurgical Society
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• 제30권12호
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• pp.1388-1393
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• 2001

Objective : In the retrospective analyzing 19 consecutive patients with subaxial cervical spine(C3~T1) injury treated by posterior cervical fixation and fusion, clinical manifestation, radiologic finding, operative technique, and postoperative results following 6 months were analyzed. Materials and Methods : Most common fracture level was C4-5, mean age 41, and male to female ratio 13 : 6. The most common cause of injury was motor vehicle accident(17 cases). In 19 cervical procedures, interspinous triple wiring was done in 14 cases, lateral mass plating in 5 cases, and additional anterior fusion in 2 cases. Results : Twelve weeks after operation, all cases were reviewed by plain cervical radiogram. In 17 cases that treated by posterior fusion only, 14 cases(81%) had kyphotic angle change less than $5^{\circ}$, 2 cases(12%) $5-20^{\circ}$, and 1 case(6%) more than $20^{\circ}$. Overall fusion rate was 88%, and there was no significant difference of bone fusion rate between autogenous bone graft and allogenous bone graft. Conclusion : In the case of severe posterior column injury or displacement, posterior approach seems superior to anterior approach, but in the case of combined anterior column injury, anterior approach is considered necessary. In this study, posterior fixation and fusion might be acceptable procedure for subaxial cervical fracture and dislocation, owing to its high fusion rate, low kyphotic angulation and low operation related complication rate.

• Journal of Korean Society of Transportation
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• 제20권5호
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• pp.23-31
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• 2002

The headway of vehicles entering an intersection is closely related with the saturation flow rate and is a basic parameter required for determining the saturation headway and the start-up lost delay. Since such headway value reflects the drivers' behaviors and features of the intersection, all intersections don't have an equal value, but are affected by number and location of their lanes, changing types, local characteristics and time zone. Accordingly, this study attempted to suggest proper values on the basis of data by investigating headway in lanes. Number of exclusive through lanes was divided into single lane, double lanes and triple lanes, the locations of lanes were divided into inside lane, central lane and outside lane. As a result of investigating the headway, single through lane, double through lanes-inside lane, and triple through lane-outside lane showed as 1.73 sec., 1.71 sec. and 1.93sec., respectively. The result of calculating the area factor of business areas by fixing 1.00 for the residental area and applying relation between headway and saturation flow rate was 0.96. In the case of start-up lost delay lead dual left turn and directional separation were 1.41 sec. and 3.27 sec., respectively, showing the great difference. Therefore, different start-up lost delay according to changing type should be applied.

• Journal of Ginseng Research
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• 제30권3호
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• pp.132-136
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• 2006

This study was carried out to study the effect of emergence type of multiple stem and main bud on the quality of fresh and red ginseng in Korean ginseng. To achieve the aim of this study, characteristics of roots and quality factors were investigated. Single stem plants were 62.9% of the total samples, and the remainder(37.1%) were multiple stem plants. The number of stems affected considerably on root weight. Root weight of triple stem type with triple main bud was the largest among the types. As the number of stem per plant increased, the root quality became worse. In both single and multiple stem, the more the number of main buds was, the lower the quality grade was. Yield of the red ginseng was about 30%, showing little difference between single stem and multiple stem plant. As the number of stem increased, yield of Bonsam decreased. The quality grade of red ginseng of single stem was better than that of multiple stem. Multiple stem plant produced relatively more Yangsam and Japsam. As the number of main bud increased, the quality grade of ginseng decreased.

• The Korean Journal of Pain
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• 제33권1호
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• pp.40-47
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• 2020

Background: Duloxetine is an antidepressant that is also useful in chronic neuropathic and central origin pain. In this study, the role of duloxetine in decreasing acute postoperative pain after lumbar canal stenosis surgery is explored. Methods: In this single center, triple blinded, and placebo-controlled trial, 96 patients were randomized for statistical analysis. The intervention group received oral duloxetine 30 mg once a day (OD) for 2 days before surgery, 60 mg OD from the day of surgery to the postoperative second day and 30 mg OD for the next 2 days (a total duration of 7 days). A placebo capsule was given in the other group for a similar time and schedule. The same standard perioperative analgesia protocols were followed in both groups. Results: Total morphine consumption up to 24 hours was significantly decreased in the duloxetine group (P < 0.01). The time to the first analgesia requirement was similar in both groups but the time to the second and third dose of rescue analgesia increased significantly in the duloxetine group. The time to ambulation was decreased significantly (P < 0.01) in the duloxetine group as compared to the placebo group. Pain scores remained similar during most of the time interval. No significant difference was observed in the complication rate and patient satisfaction score recorded. Conclusions: Duloxetine reduces postoperative pain after lumbar canal stenosis surgery with no increase in adverse effects.

• Restorative Dentistry and Endodontics
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• 제44권2호
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• pp.21.1-21.8
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• 2019

Objectives: The purpose of the present study was to evaluate the effect of calcium hydroxide with 2% chlorhexidine gel (HCX) or distilled water (HCA) compared to triple antibiotic paste (TAP) on push-out bond strength and the cement/dentin interface in canals sealed with White MTA Angelus (WMTA) or Biodentine (BD). Materials and Methods: A total of 70 extracted human lower premolars were endodontically prepared and randomly divided into 4 groups according to the intracanal medication, as follows: group 1, HCX; group 2, TAP; group 3, HCA; and group 4, control (without intracanal medication). After 7 days, the medications were removed and the cervical third of the specimens was sectioned into five 1-mm sections. The sections were then sealed with WMTA or BD as a reparative material. After 7 days in 100% humidity, a push-out bond strength test was performed. Elemental analysis was performed at the interface, using energy-dispersive spectroscopy. The data were statistically analyzed using analysis of variance and the Tukey test (p < 0.05). Results: BD presented a higher bond strength than WMTA (p < 0.05). BD or WMTA in canals treated with calcium hydroxide intracanal medications had the highest bond strength values, with a statistically significant difference compared to TAP in the WMTA group (p < 0.05). There were small amounts of phosphorus in samples exposed to triple antibiotic paste, regardless of the coronal sealing. Conclusions: The use of intracanal medications did not affect the bond strength of WMTA and BD, except when TAP was used with WMTA.

• Journal of Dental Anesthesia and Pain Medicine
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• 제22권1호
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• pp.29-37
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• 2022

Background: Pain, edema, and trismus are predictable sequelae for surgical extraction of impacted mandibular third molars (M3M). The present study aimed to compare the anti-phlogistic potential of bromelain and aceclofenac in the reduction of post-surgical sequalae in the extraction of impacted M3M. Method: A randomized controlled, triple-blinded clinical study included 72 patients scheduled for surgical removal of impacted M3M under local anesthesia. Randomization was performed and subjects were equally allocated to groups A (control) and B (study), who intended to receive aceclofenac and bromelain, respectively. The primary outcome variables were pain, edema, and trismus evaluated on postoperative days 2 and 7 and compared with baseline values. The secondary variables evaluated were the quantity of rescue analgesics required and the frequency of adverse effects in both groups for 7 postoperative (PO) days. Data were analyzed with a level of significance of P < 0.05. Results: Group B demonstrated a significant decrease in the severity of edema and trismus compared to group A on both PO days 2 and 7 (P < 0.001). Bromelain demonstrated similar analgesic efficacy with an insignificant difference compared to aceclofenac (P > 0.05). Conclusion: The present study showed that the efficacy of bromelain was comparable to that of aceclofenac in reducing inflammatory complications following surgical removal of impacted M3M. Bromelain can be considered a safe and potent alternative to routinely used aceclofenac when addressing inflammatory outcomes after surgery.