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Link Adaptation with SNR Offset for Wireless LAN Systems
김찬홍,정교원,고경준,이정우,Kim, Chan-Hong,Jeong, Kyo-Won,Ko, Kyeong-Jun,Lee, Jung-Woo The Korean Institute of Communications and Informa 2011 韓國通信學會論文誌 Vol.36 No.10A
Link Adaptation should select the best modulation and coding scheme (MCS) which gives the highest throughput as channel conditions vary. Several link adaptation algorithms for wireless local area network (WLAN) have been proposed but for the future WLAN systems such as 802.11n system, these algorithms do not guarantee the best performance. In this paper, we propose a new link adaptation algorithm in which an MCS level is chosen by the received SNR plus the offset value obtained from the transmission results. The performance of proposed algorithm is simulated by an IEEE 802.11n system. From the analysis, we conclude the proposed algorithm performs better than the well-known link adaptation algorithms such as auto rate fallback and general SNR-based techniques. Particularly, the proposed algorithm improves throughput when the packet error ratio (PER) is constrained for fast fading channels. 링크 적응 기법은 변하는 채널 조건에 맞는 최적의 MCS 레벨을 선택한다. 무선 LAN 시스템을 위한 다양한 링크 적응 알고리즘이 제안되었으나 802.11n과 같은 최근의 시스템에서 최적의 성능을 보장하지는 않는다. 본 논문에서는 수신 SNR과 전송 결과에 따라 얻어지는 오프셋 값을 이용한 새로운 링크 적응 알고리즘을 제안한다. 802.11n 시스템에서 모의실험을 하여 제안된 알고리즘과 잘 알려져 있는 ARF 및 일반적인 SNR기반 알고리즘과 그 성능을 비교해본다. 제안된 알고리즘은 PER에 제한이 있는 경우 시변채널에서 더 좋은 성능을 보인다.
이정욱 ( Jeong Uk Lee ),서정교 ( Jeong Kyo Seo ),신윤섭 ( Yun Sup Shin ),박진무 ( Jin Moo Park ),정미현 ( Mi Hyeon Jeong ),최인호 ( In Ho Choi ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
Near field recording (NFR) technology with SIL has been thought as the most promising generation optical storage device. A gap distance between the SIL and the disc should be controlled to be 20~40nm. We observed gap error signal in our NFR test-bed using a blue LD (405nm). The digital gap servo filter and control algorithm were developed to maintain a constant air gap by adopting a conventional actuator.
외국인 개별여행자를 위한 게스트하우스의 라운지 디자인 연구
김정혜 ( Jeong Hye Kim ),이정교 ( Jung Kyo Lee ) 한국공간디자인학회 2013 한국공간디자인학회논문집 Vol.8 No.4
(Background and Purpose) The number of foreign travelers who visit Korea through cultural exchanges is increasing annually. Therefore, accommodations must be selected to suit foreign travelers` purposes, tastes and financial situations. However, domestic accommodations are restricted to hotels and inns. Therefore, there is a need to expand the concept of the guesthouse, which is a more affordably priced accommodation facility with lounge space for travelers to shareinformation and participate in cultural exchanges. (Method) This study included the oretical considerations associated with foreign travelers and the guesthouse concept, with a particular focus on lounge space within the guesthouse. Main viewpoints were extracted through literature research, and various elements were studied in detail, including location, price, convenience of the facility, space analysis, the space experience factor, and spatial characteristics. (Result) As a result of this evaluation, it is expected that an improved domestic accommodation facility model can be realized based on an expansion in guesthouse and lounge space design and development. Consequently, travelers should find it easier to exchangetravel and cultural information.
김정훈 ( Jeong Hoon Kim ),권순찬 ( Soon Chan Kwon ),안재성 ( Jae Sung Ahn ),전상룡 ( Sang Ryong Jeon ),나영신 ( Young Shin Ra ),김창진 ( Chang Jin Kim ),이정교 ( Jung Kyo Lee ) 대한뇌종양학회 2003 대한뇌종양학회지 Vol.2 No.2
Objective:The goal of this study was to characterize the clinical, radiological, surgical, and pathological findings in patients with both pituitary adenoma and Rathke`s cleft cyst. Methods:We conducted a retrospective study of patients with concomitant pituitary adenoma and Rathke`s cleft cyst operated on from 1991 through 2001 at our institution. Three patients were identified with this diagnosis. The medical records, neuroradiologic studies, and histologies were reviewed. Results:There were 771 patients with pituitary adenoma and 46 with Rathke`s cleft cyst in the same period. The frequency of the combination was 0.39 % of pituitary adenoma and 6.5% of Rathke`s cleft cyst. One case was associated with hyperprolactinemia. Preoperative diagnosis on the basis of CT/MRI was pituitary adenoma in all three cases. Transsphenoidal approaches were done for these three patients, and postoperative courses were uneventful. Hormonal and visual symptoms were improved. Histologically, the tumor was composed of typical pituitary adenoma and component compatible with Rathke`s cleft cyst. Conclusion:When a non-enhancing cyst-like structure is demonstrated in a patient with pituitary adenoma, the possibility of a coexisting Rathke`s cleft cyst should be considered. Patients with this kind of pituitary tumor can be managed in the same fashion as patients with other types of pituitary adenoma.
이진수(Lee Jin Soo),라기례(Ra Gi Rye),김정교(Kim Jeong Kyo) 한국국제회계학회 2010 국제회계연구 Vol.0 No.31
본 연구에서는 우리나라 기업들의 이익관리가 경영자의 이기적인 목적을 위한 기회 주의적인 행위에 의해 수행되는지(기회주의적 이익관리), 아니면 효율적인 계약에 따라 이익의 정보성을 향상시키기 위해 기업의 미래경영성과에 관한 경영자의 사적정보를 전달하는 행위에 의해 수행되는지(효율적 이익관리)를 우리나라 상장기업을 대상으로 조사한다. 그리고 이와 관련하여 기업지배구조(대주주 지분율, 외국인 지분율, 감사품질, 사외이사 비율, 감사위원회)가 이익관리 유형에 어떤 영향을 미치는지를 알아본다. 분석 결과, 우리나라 상장기업들의 이익관리는 대체로 효율적인 이익관리의 형태로 이루어지는 것으로 나타났다. 이러한 증거는 이익관리가 기회주의적이라는 일반적인 예상과는 일치하지 않는 것이다. 그리고 본 연구에서 사용한 기업지배구조변수 중에서 대주주 지분율과 감사품질은 효율적인 이익관리에 기여하는 것으로 나타났다. 즉, 대주주 지분율이 높을수록, 그리고 감사품질이 높을수록 효율적인 이익관리의 특성이 더 뚜렷하게 나타났다. 반면에 외국인 지분율, 사외이사 비율, 감사위원회는 이익관리 유형에 유의한 영향을 미치지 않는 것으로 나타났다. We investigated whether the firms listed on the Korea Stock Exchange implement earnings management efficiently or opportunistically. We further study whether the effect of ownership structure, and corporate-governance practices have impact on the type of earnings management. The results of this study are summarized as follows. Using multiple regressions, we present the empirical evidence that the type of earnings management tends toward the efficient earnings management. This evidence is inconsistent with the common view that earnings management in Korea is opportunistic. Ownership and the type of audit firms have a significant influence on the type of earnings management selected. Firms with a high proportion of majority ownership and firms audited by the Big audit firms(audit quality) are more inclined to choose efficient earnings management than other types of firms. We find inconsistent evidence about the effect of foreigner ownership , the dependent board and audit committee on the type of earnings management.
서정석 ( Jeong Suk Seo ),강신광 ( Shin Kwang Khang ),김창진 ( Chang Jin Kim ),이정교 ( Jung Kyo Lee ) 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2005 대한뇌종양학회지 Vol.4 No.2
Intracranial non-vestibular schwannomas without neurofibromatosis are rare and typically symptomatic. Herein, we report one patient with a malignant oculomotor schwannoma and another patient with an asymptomatic benign oculomotor schwannoma who underwent surgical excision in 1994 and 2003, respectively. The patient with the malignant oculomotor schwannoma underwent adjuvant radiotherapy and chemotherapy postoperatively. Only 31 cases of benign oculomotor schwannomas have been reported in the English literature.
이철호,김정교,Lee, Cherl-Ho,Kim, Jeong-Kyo 한국식품과학회 1985 한국식품과학회지 Vol.17 No.6
루핀콩(lupinus angustifolius)의 식품으로서의 가치를 평가하기 위한 형태학적 접근방법의 하나로써 취반시(時) 일어나는 미세구조적 변화를 대두와 비교하였다. 루핀공은 대두에 비해 두꺼운 세포벽과 pit-pair을 가지며 protein body안에 많은 crystaloid를 포함하고 있어, oil seed인 대두와는 상당히 다른 자엽구조를 보여 주었다. 또한 대두에서는 높은 온도($120^{\circ}C$)로 가열했을 때 (20분) middle lamella 구조의 파괴와 함께 세포벽의 손상이 명백하였으나, 루핀콩의 경우 $120^{\circ}C$에서 장시간(130분) 가열했을 때에도 세포벽의 파괴 및 middle lamella의 파괴없이 본래의 자엽세포 구조를 유지하였다. The structure of the seed of Lupinue angustifolius was studied in order to investigate the Food quality of lupin seed in comparision with soybean. The cotyledonary cells of lupinseed was in egg-like shape and much (more than 4 times) larger than those of soybean. The microstructure of cotyledonary cells of lupinseed was characterized with thick cell wall having distinct pit-pairs. The protein bodies in lupinseed cotyledon cell contained numerous crystaloids, which was absent in soybean. The middle lamella of soybean cell was partially disintegrated by excessive heat treatment ($120^{\circ}C$, 20 min), whereas those of lupinseed did not change much by heting at $120^{\circ}C$ for 130 min.
브랜드 커뮤니케이션을 위한 공간마케팅 전략에 관한 연구 -소비자 혜택 공간을 중심으로-
이미정 ( Mi Jeong Lee ),이정교 ( Jung Kyo Lee ) 한국공간디자인학회 2013 한국공간디자인학회논문집 Vol.8 No.2
(Background and Purpose)Brand space has become the most dramatic communication media. As the notion of space held by industry and consumers has changed, issues have come to the fore regarding quality of life and level of spatial awareness. The act of purchase has evolved from being rational to involving a sensibility that has stimulated companies to become differentiated from their competitors by symbolizing certain core values and characteristics. (Method)Space marketing is defined as a strategic communication method that uses space as a medium to imprint brand identity and create added values. Three types of derived strategies are used as the criteria for the case studies: the Culture-Image-Experience strategy. (Result)This study found that “space” is a strategic point for sensible stimulation that arouses positive brand awareness. Effective brand communication systems need to be built to enhance the life of consumers through space marketing strategies.