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A FEC Architecture for UWB System

Sung-woo Choi, Sang-sung Choi, Han-ho Lee
2006 IEEE Vehicular Technology Conference  
⎯ The MB-OFDM UWB for IEEE802.15.3a uses a R=1/3 convolutional code for the error correcting code. Furthermore, it uses a Reed-Solomon code to protect the PLCP header from impairment. In this paper, we show a detailed hardware architecture and implementation results of FEC (forward error correction) for the MB-OFDM UWB. We propose a Viterbi decoder with radix-4 ACS to resolve the timing problem and we show important parameters which are necessary for the hardware design. The estimated hardware
more » ... ize of the Viterbi decoder is 120k gates and the clock frequency is 144MHz. The proposed Reed-Solomon decoder uses a modified euclidean algorithm to solve a key equation. This RS decoder has low latency and small area using simple and regular processing elements for the key equation solve block. The RS decoder is 27k gates and it can operate at a clock frequency of 232MHz, and has the latency of 46 symbol clocks. When RS code is applied to the whole data field, the area increased to about 3 times.
doi:10.1109/vtcf.2006.309 dblp:conf/vtc/ChoiCL06 fatcat:igjjynklrvd6lbpmt576w5m2xq

RS decoder architecture for UWB

Sung-Woo Choi, Sang-Sung Choi, Han-ho Lee
2006 2006 8th International Conference Advanced Communication Technology  
UWB is the most spotlighted wireless technology that transmits data at very high rates using low power over a In modem transmitter, Reed-Solomon code is adopted for wide spectrum of frequency band. UWB technology makes it outer code to protect header data from impairment. In Fig. 1 , possible to transmit data at rate over 100Mbps within 10 meters. PHY header, NIAC header and HCS, 17 bytes, are scrambled To preserve important header information, MB-OFDM UWB and encoded using RS(23,17) code and
more » ... sidual 6 parity bytes adopts Reed-Solomon(23,17) code. In receiver, RS decoder needs . T high speed and low latency using efficient hardware. In this are appended. This code enables to correct maximum 3 bytes paper, we suggest the architecture of RS decoder for MB-OFDM error including parity bytes. This RS(23,17) code is shortened UWB. We adopts Modified-Euclidean algorithm for key equa-form of RS(255,249) code. The generator polynomial of tion solver block which is most complex in area. We suggest RS(255,249) is as follows. pipelined processing cell for this block and show the detailed architecture of syndrome, Chien search and Forney algorithm 6 block. At last, we show the hardware implementation results of g(X =J7(x -X6+126X5 +4X4+158X3+58X2+49x+117 ( RS decoder for ASIC implementation.
doi:10.1109/icact.2006.206086 fatcat:n5dc2zewtveineabdc5zqrdg2i

Survey of Depression in the Elderly Patients with Diabetes Mellitus

Bum-Sung Choi, Sewoong Kim, Seon-Cheol Park, Se-Hoon Shim, Hoo Rim Song, Sung Hae Chang, Jae-Sung Choi, Ho-Sung Lee, Yeo-Joo Kim, Sang-Ho Park, Young-Jun Kwon, Hwa-Young Lee
2015 Journal of Korean Neuropsychiatric Association  
ObjectivesZZDepression is commonly comorbid in elderly patients with physical illness. This study examined the prevalence of depression in the elderly with Diabetes Mellitus (DM). MethodsZZEighty-nine patients, over 60 years old, with DM were enrolled. The medical and psychiatric history, Hamilton Rating Scale for Depression (HDRS), Patient Health Questionnaire-9 (PHQ-9), Geriatric Depression Scale-Short form Korean (GDS-SF-K), and Mini-Mental Status Examination Korean version were examined.
more » ... ultsZZThe prevalence of depression was estimated as 21.3% (male 4.5% ; female 16.9%) in HDRS, 32.6% (male 9.0% ; female 23.6%) in PHQ-9, and 24.7% (male 5.6% ; female 19.1%) in GDS-SF-K. ConclusionZZThe self-reporting scale, such as GDS-SF-K, PHQ-9 is an effective screening test for depression. The prevalence of elderly depression with DM ranged from 20% to 30%, the prevalence of depression is almost three times more common in women. J Korean Neuropsychiatr Assoc 2015;54(4):475-481 KEY WORDSZZ Elderly depression · Diabetes Mellitus · Prevalence · Self-reporting scale.
doi:10.4306/jknpa.2015.54.4.475 fatcat:y7b7vlo4bze5lb2qa4tamobyoi

Isolation and description of a globally distributed cryosphere cyanobacterium from Antarctica

Ji Won Hong, Sung Hong Kim, Han-Gu Choi, Sung-Ho Kang, Ho-Sung Yoon
2013 Polar Research  
A previously uncultured cyanobacterium, strain KNUA009, was axenically isolated from a meltwater stream on Barton Peninsula, King George Island, South Shetland Islands, Antarctica. Molecular evidences showed that the isolate belongs to groups of globally distributed cryosphere cyanobacterial clones and this new isolate represents the first laboratory culture to be assigned to these groups. Strain KNUA009 was able to thrive at low temperatures ranging between 58C and 208C, but did not survive at
more » ... temperatures of 258C and above. As the isolate morphologically resembled Oscillatoria species, it is suggested that this cyanobacterium may represent a new species clade with cold resistance within the genus Oscillatoria.
doi:10.3402/polar.v32i0.18529 fatcat:qjvntkatejg2vmk7ypakgrtema

Infinite Order Discrete Variable Representation for Quantum Scattering [article]

Nark Nyul Choi, Min-Ho Lee, Sung Ho Suck Salk
1997 arXiv   pre-print
Choi for helpful discussions and W.H. Thompson for providing information on the calculational results in references [15] and [16] .  ... 
arXiv:physics/9710031v1 fatcat:4xo2qpfdm5cspd6kscrssk74ou

A degradable polydopamine coating based on disulfide-exchange reaction

Daewha Hong, Hojae Lee, Beom Jin Kim, Taegyun Park, Ji Yu Choi, Matthew Park, Juno Lee, Hyeoncheol Cho, Seok-Pyo Hong, Sung Ho Yang, Sun Ho Jung, Sung-Bo Ko (+1 others)
2015 Nanoscale  
A universal coating method with stimuli-responsive degradability was developed based on a disulfide-linked dopamine derivative, inspired by mussel-adhesive proteins.
doi:10.1039/c5nr06460k pmid:26572596 fatcat:ji6ib7mm2vedbhghpsizhn3eay

Use of Extracorporeal Life Support for Heart Transplantation: Key Factors to Improve Outcome

Jun Ho Lee, Nayeon Choi, Yun Jin Kim, Kiick Sung, Wook Sung Kim, Darae Kim, Jeong Hoon Yang, Eun-Seok Jeon, Sung Ho Shinn, Jin-Oh Choi, Yang Hyun Cho
2021 Journal of Clinical Medicine  
Although patients receiving extracorporeal life support (ECLS) as a bridge to transplantation have demonstrated worse outcomes than those without ECLS, we investigated the key factors in the improvement of their posttransplant outcome. From December 2003 to December 2018, 257 adult patients who underwent heart transplantation (HTx) at our institution were included. We identified 100 patients (38.9%) who underwent HTx during ECLS (ECLS group). The primary outcome was 30-day mortality after HTx.
more » ... he median duration of ECLS was 10.0 days. The 30-day mortality rate was 3.9% (9.2% in peripheral ECLS, 2.9% in central ECLS, and 1.9% in non-ECLS). The use of ECLS was not an independent predictor of 30-day and 1-year mortality (p = 0.248 and p = 0.882, respectively). Independent predictors of 30-day mortality were found to be higher ejection fraction (p < 0.001), Sequential Organ Failure Assessment score (p < 0.001), and total bilirubin level (p = 0.005). In a subgroup analysis, cannulation type was not a predictor of 30-day mortality (p = 0.275). Early ECLS application to prevent organ failure and sophisticated management of acute heart failure may be important steps in achieving favorable survival after HTx.
doi:10.3390/jcm10122542 fatcat:yrcfir7yzvhajoq2tcds4nz7iy

Unsuccessful Percutaneous Endoscopic Lumbar Discectomy

Kyung-Chul Choi, June-Ho Lee, Jin-Sung Kim, Luigi Andrew Sabal, Sol Lee, Ho Kim, Sang-Ho Lee
2015 Neurosurgery  
Choi et al 24 described a procedure in which the cannula was initially positioned at the lower part of the disc and gradually shifted upward.  ...  Choi et al 26 introduced the MRI-equipped operative suite-assisted PELD for concerns about surgical failure, especially highly migrated disc.  ... 
doi:10.1227/neu.0000000000000628 pmid:25599214 fatcat:sa7nx5eyqrgydkonqtubumqt6i

Lateral Epicondylitis: Current Concept

In-Ho Jeon, Aashay Laxmikant Kekatpure, Ji-Ho Sun, Kyeong-Bo Shim, Sung-Hoon Choi, Sung-Joon Lim, Jae-Myeung Chun
2014 Clinics in Shoulder and Elbow  
Lateral epicondylitis is one of the most common causes of elbow pain and has been known to be caused by degeneration of the extensor carpi radialis brevis (ECRB). Nonoperative treatment should be tried first in all patients, because it has been deemed highly successful; however only few prospective studies suggest that symptoms frequently was completely resolved. Operative treatment is indicated for recalcitrant pain after failed conservative treatment, which involves excision of the pathologic
more » ... portion of the ECRB and results in a high degree of subjective relief and functional restoration. We will review the pathology of the lateral epicondylitis and operative and nonoperative treatment of lateral epicondylitis. (Clin Shoulder Elb 2014;17(3):138-144)
doi:10.5397/cise.2014.17.3.138 fatcat:j2x6zxqky5dgxfmppuen2ux3n4

Changes in Treatment Outcomes of Gastric Cancer Surgery Over 45 Years at A Single Institution

Woo Jin Hyung, Sung Soo Kim, Won Hyuk Choi, Jae Ho Cheong, Seung Ho Choi, Choong Bai Kim, Sung Hoon Noh
2008 Yonsei medical journal  
Purpose: Although many studies have demonstrated improvements in short-and long-term outcomes of gastric cancer surgery, changes in long-term survival over time are not wellestablished. This study was conducted to evaluate changes in host, tumor, and treatment factors in patients treated at a single institution over a period of 45-yr. Patients and Methods: We retrospectively evaluated 9282 patients with gastric cancer from 1955 to 1999, and divided the 45-yr into 4 time frames based on
more » ... articles: 1955 to 1962 (n = 228), 1963 to 1972 (n = 891), 1973 to 1988 (n = 2789), and 1989 to 1999 (n = 5374). Results: Remarkable changes were noted in host, tumor, treatment factors, and prognosis. Among host factors, patients of more advanced age were identified in the 4th period and mean age shifted from 49 to 55 yrs. Among tumor factors, early gastric cancers and upper body tumors increased up to 32% and from 7% to 13%, respectively. An increase in the annual number of patients (from 29 to 649), gastrectomies (from 14 to 600), rate of resection (from 50% to 90%), rate of curative resection (up to 92%), and proportion of total gastrectomy (from 8% to 29%) was noted. Operative mortality was reduced from 6.1% to 0.7%. The overall 5-yr survival rate significantly increased from 22% to 65%. Conclusion: Treatment results of gastric cancer surgery have improved remarkably over the 45-year period. Increase of early stage gastric cancer with early diagnosis considerably influenced the improved survival of patients with gastric cancer.
doi:10.3349/ymj.2008.49.3.409 pmid:18581590 pmcid:PMC2615336 fatcat:z2peangyvnbhrknj4i3bnngawm

Purine-Based Inhibitors of Inositol-1,4,5-trisphosphate-3-kinase

Young-Tae Chang, Gildon Choi, Yoe-Sik Bae, Matthew Burdett, Ho-Sang Moon, Jae Wook Lee, Nathanael S. Gray, Peter G. Schultz, Laurent Meijer, Sung-Kee Chung, Kwan Yong Choi, Pann-Ghill Suh (+1 others)
2002 ChemBioChem  
Inositol 1,4,5-trisphosphate 3-kinase (IP3K) catalyzes the adenosine triphosphate (ATP) dependent phosphorylation of inositol 1,4,5-trisphosphate (IP3) to inositol 1,3,4,5-tetrakisphosphate (IP4) [1] and plays an important role in the regulation of intracellular calcium concentration. IP3 is a well-known second messenger that stimulates intracellular calcium mobilization, which is in turn responsible for numerous intracellular responses related to fertilization, cell growth, and secretion. [2]
more » ... roduction of IP3 is triggered by cell surface receptor activation by extracellular ligands that act downstream of [a] Prof. Figure 1. Inositol phosphate signaling pathway and metabolism. ER endoplasmic reticulum; 5-ppase 5-phosphatase; PLC phospholipase C.
doi:10.1002/1439-7633(20020902)3:9<897::aid-cbic897>3.0.co;2-b pmid:12210991 fatcat:6l5qozylnbaynon5gcknuwfu3u

A Synonymous Genetic Alteration of LMX1B in a Family with Nail-Patella Syndrome

Joo Ho Ham, Seok Joon Shin, Kyu Re Joo, Sung Min Park, Hye Young Sung, Joong Seok Kim, Jin Soo Choi, Yeong Jin Choi, Ho Cheol Song, Eui Jin Choi
2009 The Korean Journal of Internal Medicine  
The gene responsible for nail-patella syndrome, LMX1B, has recently been identified on chromosome 9q. Here we present a patient with nail-patella syndrome and an autosomal dominant pattern of inheritance. A 17-year-old girl visited our clinic for the evaluation and treatment of proteinuria. She had dystrophic nails, palpable iliac horns, and hypoplastic patellae. Electron microscopy of a renal biopsy showed irregular thickening of the glomerular basement membrane. A family history over three
more » ... erations revealed five affected family members. Genetic analysis found a change of TCG to TCC, resulting in a synonymous alteration at codon 219 in exon 4 of the LMX1B gene in two affected family members. The same alteration was not detected in an unaffected family member. This is the first report of familial nail-patella syndrome associated with an LMX1B in Korea mutation, However, we can not completely rule out the possibility that the G-to-C change may be a single nucleotide polymorphism as this genetic mutation cause no alteration in amino acid sequence of LMX1B. (Korean J Intern Med 2009;24:274-278)
doi:10.3904/kjim.2009.24.3.274 pmid:19721866 pmcid:PMC2732789 fatcat:ae2y4ajqvvbbpp6ghniybembsy

Mid-term Clinical

Jei Keon Chae, Koang Ho Choi, Sung Ki Moon, Won Ho Kim, Jae Ki Ko
1999 Korean Circulation Journal  
Circulation 1991 83 148-61. 14) Agrawal SK, Ho DSV, Liu MW. Predictors of thrombo- tic complication after placement of a flexible coil stent.  ...  Predictors of in-hos- pital and 6 month outcome after acute myocardial infa- rction in the reperfusion era The primary angioplasty in myocardial infarction PAMI trial.  ... 
doi:10.4070/kcj.1999.29.1.28 fatcat:i3aiqfiu2ne3hbralr77xxvrei

Some Unrecorded Higher Fungi of the Seoraksan and Odaesan National Parks

Sang-Kuk Han, Young-Jun Park, Sung-Keun Choi, Je-O Lee, Jong-Ho Choi, Jae-Mo Sung
2006 Mycobiology  
Higher Fungi were collected twice a month from May to September 2004 during field survey trips to Seoraksan and Odaesan National Parks. All the collected specimens were investigated for the morphological characters of carpophores and other features, and deposited in the herbarium of the Entomopathogenic Fungal Culture Collection (EFCC), Kangwon National University, Chuncheon. Among the identified specimens, three genera Rhodotus, Hotermannia and Sebacina and four species Rhodotus palmatus,
more » ... us clavatus, Holtermannia corniformis and Sebacina incrustans were confirmed as new to Korea and reported here with descriptions.
doi:10.4489/myco.2006.34.2.056 pmid:24039471 pmcid:PMC3769548 fatcat:vt3x6vbv5rbb5kfal4hhvv2nhu

Efficacy of Hood-cap Assisted Colonoscopy; Comparison with Conventional Colonoscopy

Sung Won Choi, Hee Seung Park, Jae Seung Lee, Sang Yon Hwang, Sung Dong Kwak, Seong Ho Choi
2012 Intestinal Research  
Background/Aims: A few studies showed that hood-cap assisted colonoscopy (CAC) had improved cecal intubation rate and cecal intubation time but did not help in finding colon polyps in comparison with conventional colonoscopy (CC). However, other studies have shown different results. Therefore, we investigated the efficacy of CAC for the cecal intubation time and polyp detection rate. Methods: Patients for colonoscopy in Busan St. Mary's Medical Center were enrolled to this randomized controlled
more » ... trial between July 2010 and September 2010. The evaluated outcomes were polyp detection rate, adenoma detection rate, and cecal intubation time in all patients, in difficult cases (history of previous abdominal or pelvic surgery, obesity, old age), and in the expert and non-expert groups. Results: A total of 260 patients enrolled in this study were randomly allocated to the CAC group (n=130), or CC group (n=130). The overall cecal intubation time was shorter in the CAC group (5.7±3.4 min vs. 7.8±5.7 min, P<0.001). The polyp detection rate was higher in the CAC group (58.4% vs. 43%, P=0.008). The cecal intubation time in the expert and non-expert groups were shorter in the CAC group (expert: 4.1±2.2 min vs. 5.5±2.0 min, P=0.001; non-expert: 6.7±3.7 min vs. 9.4±5.9 min, P=0.001). Conclusions: The use of CAC improved the detection rate of colon polyps and shortened the cecal intubation time for both the expert and non-expert groups. (Intest Res 2012;10: 280-288)
doi:10.5217/ir.2012.10.3.280 fatcat:7wgd6ofwkzgyfou6pxsu2ik374
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