IEEE 802.11n에서의 2단계 프레임 집약 기법 성능 분석

송태원,양성열,백상헌,윤주상,Song, Tae-Won,Yang, Seong-Yeol,Pack, Sang-Heon,Youn, Joo-Sang 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.6

차세대 무선랜 표준인 IEEE 802.11n에서는 MAC 계층에서의 처리율을 향상시키기 위해서 프레임 집약 (Frame Aggregation) 기법을 제안하고 있다. IEEE 802.11n의 프레임 집약 기법은 MSDU (MAC Service Data Unit) 단위의 집약 기법 (Aggregate MSDU: A-MSDU)와 MPDU (MAC Protocol Data Unit) 단위의 집약 기법 (Aggregate MPDU: A-MPDU)의 두 가지 기법을 제안하고 있다. 본 논문에서는 A-MSDU와 A-MPDU를 결합한 2단계 프레임 집약 (Two-Level Frame Aggregation) 기법의 성능을 분석한다. 성능 분석을 위해 마르코브 체인에 기반하여 2단계 프레임 집약 기법의 처리율을 모델링한 뒤 이를 이용하여 노드의 수와 채널 상태 등에 따른 프레임 집약 기법의 처리율 변화 추이를 분석한다. 그리고 분석 결과에 기반하여 최적의 프레임 집약 기법을 설계하기 위한 방법을 제시한다. Frame Aggregation is a promissing technology for improving MAC throughput in IEEE 802.11n. In IEEE 802.11n, two frame aggregation schemes, Aggregate MSDU (A-MSDU) and Aggregation MPDU (A-MPDU), are defined. In this paper, we analyze the performance the two-level frame aggregation scheme where A-MSDU and A-MPDU are combined. We develop the analytical model for the two-level frame aggregation scheme and present numerical results on the effect of bit error rate, aggregation size, and the number of nodes.

만삭전 조기양막파열 산모의 정맥혈장내 지질과산화, 항산화능 및 항산화 비타민치

김윤하 ( Kim Yun Ha ),안봉환 ( An Bong Hwan ),양성열 ( Yang Seong Yeol ),김철홍 ( Kim Cheol Hong ),조문경 ( Jo Mun Gyeong ),이광수 ( Lee Gwang Su ),김석모 ( Kim Seog Mo ),송태복 ( Song Tae Bog ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.2

목적 : Pfannenstiel incision을 통한 근치자궁절제술 및 골반림프 절제술의 수술을 실시하여 vertical midline incision을 통한 수술과 수술 용의성 및 수술에 따른 제반결과에 대해 비교 분석하고자 한다. 연구 방법 : 2001년 1월부터 2003년 2월까지 만 2년 2개월간 인제대학교 의과대학 부속 부산백병원 산부인과에서 자궁경부암 (Ia₂-IIb)으로 근치자궁절제술 및 골반림프절 절제술을 시행 받은 123명의 환자를 대상으로 임상 및 병리기록을 검토하여 조사하였다. 자료는 환자의 나이, 체질량 지수, 병기, 조직분류, 림프절 수, 수술시간, 예측 실혈양, 수술병리경계의 양성율, 합병증과 재원일수를 포함하여 각 환자의 의무기록을 통하여 전향적으로 수집되었다. 통계분석은 t-test, x²-test, Fisher Exact test를 사용하였고, 유의 수준은 0.05 미만일 때 유의 하다고 판정하였다. 결과 : 근치자궁절제술 및 골반림프절 절제술 시행에 있어 Vertical midline incision으로 시행한 경우는 62 예, Pfannenstiel incision은 61예였다. 두 군간의 연령분포, 체질량 지수, 임상 병기 분포, 조직분류, 제거된 림프절수, 수술 중 평균 실혈량, 병리조직 절개부 양성율, 술 중 혹은 술 후 합병증, 재원일수에는 유의한 차이가 없었고, 평균 수술 시간이 Pfannenstiel incision에서 169분, Vertical midline incision에서 197분으로 (p-value<0.0001) Pfannenstiel incision 군에서 유의 있게 짧은 것으로 나타났다. 결론 : Pfannenstiel incision은 수술에 따른 이환율의 증가 없이 용이하게 시행되었고 Vertical midline incision과 비교 시 유사한 림프절 개수를 획득할 수 있었다. 따라서 이러한 Pfannenstiel incision은 초기 침윤성 자궁경부암의 수술 적치료로 근치자궁절제술 및 골반림프절 절제술 시행에 있어 수술 합병증의 증가나 수술부위 노출의 제약 없이 미용적인 측면에서 뿐만 아니라 수술시간의 단축이란 측면에서도 고려 될 수 있는 절개법이라 사료된다. Objective : Our purpose was to review patients undergoing radical hysterectmy and pelvic lymphadenectomy, comparing Pfannenstiel and Vertical midline incisions for operative feasibility and perioperative outcome. Methods : Between January 2001 and February 2003, 123 patients underwent radical hysterectomy and pelvic lymphadenectomy for cervical cancer at Busan Paik hospital. All procedures were performed by a gynecologic oncologist. Prospectively, all data were collected from review of each patient`s medical record, including age, body mass index (BMI), stage, histology, nodal counts, operative time, estimated blood loss, surgical pathologic margin positivity, complications, and length of hospital stay. Associations between variables were studied using X²test, t-test, and Fisher Exact test. Results : Radical hysterectomy was performed through a Vertical midline (n=62) and Pfannenstiel (n=61) incision. There were no significant differences in age, BMI, stage, histology, nodal counts, estimated blood loss, surgical pathologic margin positivity, complications, and length of hospital stay. But, patients with a Pfannenstiel incision had shorter operative time than those with Vertical midline incision (169 min vs 197 min, P<0.0001). Conclusion : Radical hysterectomy and pelvic lymphadenectomy can be safely performed through a Pfannenstiel incision without increased operative morbidity and equal nodal removal as compared with Vertical midline incision. Pfannenstiel incision may offer the benefits of improved cosmesis and shorter operative time without compromising surgical exposure or increasing the risk of surgical complications.

자간전증의 자궁정맥혈장 및 제대정동맥혈장내 항산화능과 항산화 비타민

김기민 ( Kim Gi Min ),김윤하 ( Kim Yun Ha ),안봉환 ( An Bong Hwan ),양성열 ( Yang Seong Yeol ),김철홍 ( Kim Cheol Hong ),조문경 ( Jo Mun Gyeong ),송태복 ( Song Tae Bog ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.4

목적: 자간전증시 자궁정맥혈장, 제대정맥혈장 및 제대동맥혈장의 항산화능과 항산화 비타민의 양태를 파악하여 이들이 자간전증시 산모와 태아의 병태생리에 어떤 역할을 하는지 알고자 하였다. 연구 방법: 임신 34주 이상의 정상 임부 18명과 자간전증 환자 16명으로부터 제왕절개술시 분만전에 자궁정맥혈을 채취하였고, 태아분만시 제대정맥과 동맥혈, 그리고 태반 분만후 자궁정맥혈을 채취하여 혈장을 얻었다. Thiobarbituric acid (TBA)반응을 이용하 Objective: This study was aimed to investigate lipid peroxide levels, oxygen-radical absorbance capacity (ORAC), and antioxidant vitamin levels in uterine venous plasma, umbilical venous and arterial plasma and to evaluate their roles in the pathophysiolo

Fusarium spp.균에 의한 뽕나무신소 썩음병에 관한 연구

윤형주 ( Hyung Joo Yoon ),김영택 ( Yong Taek Kim ),진경식 ( Kyoung Sik Jjn ),박인균 ( In Gyun Park ),양성열 ( Seong Yeol Yang ) 한국잠사학회 1995 한국잠사곤충학회지 Vol.37 No.1

上簇中 回轉섶 포르말린薰蒸 消毒效果

薛光烈,梁盛烈,李相豊 한국잠사학회 1991 한국잠사곤충학회지 Vol.33 No.2

Disinfection of the rotatory cocooning frame is difficult under a multiple rearing system as the work is successively done. Accordingly, to investigate the effect of formalin fumigation on the rotatory cocooning frame during mounting period the mulberry leaves smeared with the water extract of dust collected from cocooning frame after treatment were fed on the just molted 3rd instar larvae, 82% of them died with disease during 6 days, and negative effect of formalin fumigation takes place in terms of the cocoon reelability, showing 41% of it.

용천뽕에 關한 硏究 : Ⅰ.龍川뽕의 理化學性과 壯蠶期間 給與時期에 따른 飼料價値의 差異 Ⅰ.Physico-chemical Properties of Yongchonppong and Differencies of Leaf Value for Food in Growing Silkworm through Different Feeding Period

朴光駿,梁盛烈,李相郁,金基錫,崔祉亨,崔淑鍊,李龍基 한국잠사학회 1990 한국잠사곤충학회지 Vol.32 No.2

Yongchonppon, one of the native varities, is the highest clod resistant. For its practical use, feeding test has been implemented in the ordinary rearing and in the branch realing 1987 through 1988. The results are summarized as follows. 1. The feeding of Yongchonppong at the 4th and 5th instar made 5% decrease in spring and 10% decrease of cocoon yield in autumn, respectively, while cocoon shell ratio was a little less and percentage of raw silk was a little high, as compared to the feeding of Kaeryangppong. 2. The feeding of Yongchonppong at the 4th instar only showed nearly same rearing result as the feeding of Kaeryangppong. 3. In case of the feeding of Yongchonppong at the 4th instar and early stage of the 5th instar, cocoon yield and percentage of raw silk marked 96% and 97∼98% of Kaeryangppong. 4. The total nitrogen and crude protein of Yongchonnppong was less, while the total carbohydrate, crude ash and crude fat were high, as compared to those of Kaeryangppong. It had more phosphate and boric and less manganese than Kaeryangppong 5. The leaf aereal weight of Yongchonppong was 1.57g/dcm2 and the leaf thickness was 113μ. The moisture reducing rate marked 41.3% after three hour exposure to the air.

龍川뽕에 관한 硏究 : Ⅱ.寒冷紗 被覆飼育에 따른 龍川뽕(Morus alba L.)의 飼料價値 Ⅱ.Increasing Effect of Mulberry Leaf Value for Food by Cover Rearing with Vinylon Gauze

朴光駿,梁盛烈,李相郁,權在七,金英勳,金基錫,崔祉亨 한국잠사학회 1993 한국잠사곤충학회지 Vol.35 No.1

Yongchonppong is liable to withering of leaf and it is lowering leaf value for the feed. In this respect covering of the vinylon gauze over the feed has been carried out in the branch rearing system to sustain leaf value as itself. The covering of the vinylon gauze over Yongchonppong marks 7% and 9% increment of cocoon yield in dry season, spring rearing season. as compared to the non-covering of the vinylon gauze over Kaeryangppong and Yongchonppong, respectively. There was no significant differences in cocoon shell percentages of them. In more humid environment than average relative humidity in Korea the rearing results of "Yongchonppong" was improved by covering with vinylon gauze after feeding compared with the non-covered rearing. However, the vinylon gauge covering was not effective for improving the rearing results of "Kaeryangppong" . No effect of the vinylon gauze covering was seen in the area where it frequently rains and raining season lasts. In case of the non-covering of the vinylon gauze, Yongchonppong reduces repidly in the first three hours of exposure to the air, as compared to Kaeryangppong, The water content reduction rate of Yongchonppong in 6 hours of exposure to the air marks 7% to so when the dry vinylon gauze cover and 17 to 26% when the wet vinylon gauze covers, as compared to 58.8% of it for the non-covering of the vinylon gauze.