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Huge size theca luteal cyst in normal pregnancy : A Case Report
( Byung Hee Choi ),( Da Hyun Kim ),( Hye Ree Jang ),( Jung Mi Byun ),( Young Nam Kim ),( Kyung Bok Lee ),( Moon Su Sung ),( Ki Tae Kim ),( Dae Hoon Jeong ) 대한산부인과학회 2014 대한산부인과학회 학술대회 Vol.100 No.-
When ovarian tumor is discovered during pregnancy, differential diagnosis is required. Most common ovarian tumor is benign. It is similar to the nonpregnant state. In addition most benign cysts in pregnancy are resolved by itself. But sometimes corpus luteum like tumor persists into the 2nd trimester accounts for 13~17%. Especially theca luteal cyst is associated with molar pregnancy and other trophoblastic tumor. This tumor is rare of normal pregnancy. We report the case of huge size persistant theca luteal cyst in normal pregnancy. In this case, the tumors size were 22 cm until GA 19+4 weeks and not associated with molar pregnancy. And these tumors were not resolved by themselves. Patient has dyspnea, abdominal discomfort like severe symptoms. So we performed aspiration surgery. The result, Cysts were reduced by aspiration and then resolved by themselves.
Concurrent chemoradiotherapy improves survival outcome in muscle-invasive bladder cancer
Byun, Sang Jun,Kim, Jin Hee,Oh, Young Kee,Kim, Byung Hoon The Korean Society for Radiation Oncology 2015 Radiation Oncology Journal Vol.33 No.4
Purpose: To evaluate survival rates and prognostic factors related to treatment outcomes after bladder preserving therapy including transurethral resection of bladder tumor, radiotherapy (RT) with or without concurrent chemotherapy in bladder cancer with a curative intent. Materials and Methods: We retrospectively studied 50 bladder cancer patients treated with bladder-preserving therapy at Keimyung University Dongsan Medical Center from January 1999 to December 2010. Age ranged from 46 to 89 years (median, 71.5 years). Bladder cancer was the American Joint Committee on Cancer (AJCC) stage II, III, and IV in 9, 27, and 14 patients, respectively. Thirty patients were treated with concurrent chemoradiotherapy (CCRT) and 20 patients with RT alone. Nine patients received chemotherapy prior to CCRT or RT alone. Radiation was delivered with a four-field box technique (median, 63 Gy; range, 48.6 to 70.2 Gy). The follow-up periods ranged from 2 to 169 months (median, 34 months). Results: Thirty patients (60%) showed complete response and 13 (26%) a partial response. All patients could have their own bladder preserved. Five-year overall survival (OS) rate was 37.2%, and the 5-year disease-free survival (DFS) rate was 30.2%. In multivariate analysis, tumor grade and CCRT were statistically significant in OS. Conclusion: Tumor grade was a significant prognostic factor related to OS. CCRT is also considered to improve survival outcomes. Further multi-institutional studies are needed to elucidate the impact of RT in bladder cancer.
Procedure-related musculoskeletal symptoms in gastrointestinal endoscopists in Korea.
Byun, Young-Hye,Lee, Jun-Haeng,Park, Moon-Kyung,Song, Ji-Hyun,Min, Byung-Hoon,Chang, Dong-Kyung,Kim, Young-Ho,Son, Hee-Jung,Rhee, Poong-Lyul,Kim, Jae-J,Rhee, Jong-Chul,Hwang, Ji-Hye,Park, Dong-Il,Shim WJG Press 2008 WORLD JOURNAL OF GASTROENTEROLOGY Vol.14 No.27
<P>To determine the prevalence and risk factors of work-related musculoskeletal disorders in gastrointestinal endoscopists in Korea.</P>
Schwannoma of the Superficial Peroneal Nerve Presenting as Sciatica
Byun, Jae-Hoon,Hong, Jae-Taek,Son, Byung-Chul,Lee, Sang-Won The Korean Neurosurgical Society 2005 Journal of Korean neurosurgical society Vol.38 No.4
Schwannomas are benign nerve sheath tumors that can present in various locations and they have variable symptoms. However, schwannoma of the superficial peroneal nerve is rare, and only a limited number of cases have been reported. The authors here describe a case of schwannoma of the superficial peroneal nerve, which was initially considered as a L5 radiculopathy because of its clinical similarity. In the differential diagnosis of nontraumatic and nonarthritic pain of the lower leg and foot, benign tumors, particularly schwannomas of the peroneal nerves should be considered. Treatment by excision can result in relief of the symptoms and maintenance of function.
조병학(Byung-Hak Cho),신창훈(Chang-Hoon Shin),변승현(Seung-Hyun Byun),박준영(Joon-Young Park),양장범(Jang-Bum Yang) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
An innovative in-core neutron flux mapping system has been developed and applied successfully for service in a commercial pressurized water reactor. With the benefit of double indexing path selector (Dips<SUP>®</SUP>) mechanism, the reliability of the detector drive system has been improved five times higher than that of conventional systems, and the problems caused by the serious friction generated between the detector cable and guide tubing has been solved completely because the Dips<SUP>®</SUP> architecture allows the detector guide tubings to have larger curvature and shorter length in nature. The simple and fast maintenance is particularly emphasized in the detector drive system to secure minimum radiation exposure to the maintenance personnel by optimizing the number of components and providing easy access to the components. The programmable logic controller based digital controller with Windows<SUP>®</SUP> based operator’s console provides fully automated and user friendly operation and maintenance support means.
DSSS 시스템에서 주파수 오프셋을 이용한 리피터 재밍
고병훈(Byung Hoon Ko),이두호(Duho Rhee),변일무(Ilmu Byun),김광순(Kwang Soon Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
Direct sequence spread spectrum (DSSS) has inherent anti-jamming characteristics, so the normal jamming types such as tone jamming and partial band jamming cannot be effective jamming techniques. In this paper, the repeater jamming based on the frequency offset is proposed and the simulation result shows that the repeater jamming with the increased frequency offset is effective to degrade the bit error probability performance.
Delay and Energy Constrained Random Access Transport Capacity
Ilmu Byun,Byung Hoon Ko,Ki Jun Jeon,Kwang Soon Kim IEEE 2014 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.13 No.8
<P>In this paper, we consider a delay and energy constrained wireless ad hoc network with node density of λ<SUB>n</SUB>, where a packet should be delivered to the destination within D(λ<SUB>n</SUB>) seconds using at most E(λ<SUB>n</SUB>) energy in joules while satisfying the target outage probability. The performance metric for analyzing the network is the delay and energy constrained random access transport capacity (DE-RATC), i.e., $C<SUB>ϵ</SUB>(D(λ<SUB>n</SUB>), E(λ<SUB>n</SUB>), which quantifies the maximum end-to-end distance weighted rate per unit area of a delay and energy constrained network using a random access protocol. It is shown that a slotted ALOHA protocol is order-optimal under any delay and energy constraints if equipped with additional features such as power control, multi-hop control, interference control, and rate control, and the delay and energy constraints can be divided into three regions according to the relation between the physical quantities due to the constraints and those due to the node density and network size. The three regions are the non-constrained (NC) region, where the DE-RATC is given by Θ(√λ<SUB>n</SUB>/logλ<SUB>n</SUB>); the delay-constrained (DC) region, where the DE-RATC depends only on the delay constraint as Θ(D(λ<SUB>n</SUB>); and the non-achievable (NA) region where a packet delivery under the given constraints is impossible. Also, it is shown that an arbitrary tradeoff between the rate of each source node and the number of source nodes can be achieved while keeping the optimal capacity scaling as long as λ<SUB>s</SUB>=Ω√λ<SUB>n</SUB>/logλ<SUB>n</SUB>, Dλ<SUB>n</SUB>))).</P>