Post-Doc. 해외연수를 마치고

이일구 대한방사선과학회(구 대한방사선기술학회) 1990 방사선기술과학 Vol.13 No.2

한국인에 있어서 하행구개동맥의 위치 연구 (Le Fort I형 골 절단술과 관련하여)

이일구,명훈,황순정,서병무,이종호,정필훈,김명진,최진영,Lee, Il-Gu,Myoung, Hoon,Hwang, Soon-Jung,Seo, Byoung-Moo,Lee, Jong-Ho,Choung, Pil-Hoon,Kim, Myung-Jin,Choi, Jin-Young 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.6

Purpose: The Le Fort I osteotomy is a commonly performed maxillary procedure for dentofacial deformity. One of the risks of this procedure is major hemorrhage resulting from injury to the descending palatine artery. So it is very important to know the exact position of the descending platine artery. An increased understanding of the position of this artery can minimize the intra-operative bleeding while allowing extension of the bone cuts to achieve exact positioning maxilla. The aim of this investigation was to study the position of the descending palatine artery as it relates to the Le Fort I osteotomy. Methods and patients: Total 40 patients who underwent Le Fort I osteotomy in SNUDH OMFS were studied in this study. We measured the distance from the pyriform aperture to the descending palatine artery (DPA distance) using a ruler. We investigated the relationship between DPA distance, the distance from A point to the McNamara line on lateral cephalography and the patient's body height. Results: The average distances from the pyriform rim to the descending palatine artery were 35.3 mm on the right (range: $30{\sim}40mm$) and 33.7mm (range: $30{\sim}41mm$) on the left in males. Those in females were 33.4 mm on the right (range: $28{\sim}40mm)$ and 32.8mm (range: $27{\sim}38mm$) on the left. The significances between the distance the DPA distance, the body height and the distance from A point to McNamara line were not found. <Simple Regression Analysis> Conclusion: Injury to the descending palatine artery during Le Fort I osteotomy can be minimized by not extending the osteotomy more than 30 mm posterior to the pyriform aperture in mal, and 27 mm in female.

장거리 사물 인터넷 기기를 위한 간섭에 강인한 ACK 기술

이일구 한국융합학회 2018 한국융합학회논문지 Vol.9 No.9

와이파이 기반의 사물인터넷 장치는 사회, 경제, 산업에 막대한 영향을 미치고 있다. 그러나 와이파이와 같은 비면허 대역에서 동작하는 무선 전송 기술은 간섭에 취약하다. 장거리의 밀집 네트워크에서 무선 연결을 시도하는 경우에는 동적으 로 변하는 간섭 상황과 비대칭적인 간섭 조건 때문에 성능 열화가 발생한다. 본 논문에서는 장거리 사물인터넷을 위한 ACK 전송 방법을 제안한다. 본 연구 논문에서 제안한 방법에 따르면, 송신 장치와 수신 장치의 간섭 상황이 다른 비대칭적 간섭 환경에서 송신 장치가 간섭 레벨을 측정한 후 응답 프레임의 전송 속도를 추천해 응답 프레임의 전송 성공률을 향상시킨다. 그리고 고품질의 무선 채널 환경이 보장되는 경우에는 더 높은 전송 속도로 전송할 수 있다. 성능 평가 결과에 따르면 제안 하는 방법에 의해 비대칭 간섭 상황에서 20 MHz 대역폭 전송 모드에서 스루풋이 최대 9 Mbps 향상됨을 알 수 있다. Wi-Fi enabled Internet of Things (IoTs) had a substantial impact on society, economy and industry. However wireless connectivity technologies in unlicensed band such as Wi-Fi are vulnerable to interferences. They also face difficulty providing wireless connectivity over long range in dense networks due to the dynamically changed interference effect and asymmetric interference conditions. In this paper, robust acknowledgement transmission scheme is proposed for long range IoTs. According to the proposed scheme, it is possible to control the transmission rate of the transmission success rate of the response frame by adjusting the transmission rate of the response frame when the interference is present asymmetrically. It is also possible to use higher data rate when high quality link is guaranteed. The evaluation results demonstrated the proposed scheme improves the aggregate throughput by at most 9 Mbps when 20 MHz bandwidth transmission mode was adopted.

과학진흥의 긴요성과 일방안

이일구 慶熙大學校 문리과대학 1961 文理學叢 Vol.1 No.1

명산에의 등반시설문제를 논한다.

이일구,Lee, Il-Gu 한국자연공원협회 1987 한국자연공원 Vol.37 No.-

몸살 앓는 일본 레미콘 산업

이일구 한국시멘트협회 1984 시멘트 Vol.97 No.-

芍藥島 植物相의 生態學的 硏究

李一球 建國大學校基礎科學硏究所 1982 理學論集 Vol.7 No.-

This paper contains the results obtained by ecological investigation of flora in Jak-yak Island of Incheon Harbor in the west coast in Korea. Twenty-four varieties, 182 species, 147 genera and 63 families of Tracheophyta were recorded by field investigations conducted over two times in August, 1980(1st)and August, 1981(2nd) and September, 1981(3rd). The flora of this island showed a plant community predominated by pinus thunbergii grown in mingle with Pinus densiflora, Robinia pseudo-acacia, Prunus yedoensis, Prunus Sangentii, Pueraria thunbergiana. Generally, the number of plant species was scarce, but it was an unexpected result that such mountainous plants as Convallaria Keiskei, Arisaema amurense var. serratum, Aconitum pulcherrimum, Polygonatum odoratum var. pluriflorum, Pseudostellaria palibiniana etc. were the undergrowth of the acacia forests (Robinia Pseudo-acacia) Phyllostachys nigra var. henonis was grown in south side from the island, while no evergreen broad-leaved trees.

禿裸地의 植生에 關한 生態學的 硏究

李一球,李浩俊,李龍熙,申容雨 건국대학교 1971 學術誌 Vol.12 No.1

According to research on the vegetation of several bald hills in the Seoul suburbs and Ichun area, almost the same types of interior dry plants were present, indicating their desirability for planting on such sites. On this basis we researched the vegetation and analyzed the soil at 23 bald hill localities distributed through all the provinces. The bald hill soils were divided into two groups : granite base soils and clay soils. Analysis established that in each case the pH was the same as the mature forest soil of the control groups and that organic content differed only slightly, but that moisture content and field capacity were so low that such sites were undesirable for the planting of most tree species. Though the climatic condition vary due to the long distance from north and south, the vegetation is much the same, including : Pinus densiflora, sorbus alnifolia var. typical, Lespedeza cyrtobatrya, Quercus serata, Indigofera kirilowi, Roinia pseudo-Acacia, Arundinella hirta var. ciliata, Miscanthus sinensis, Zoysia japonica, Themeda japonica, Cassia nomame, etc. We therefore assume that these kind? of resistant dry interior plants are suitable ones for the planting of bald hills.

장거리 사물인터넷을 위한 케리어 센싱 기술

이일구 한국융합학회 2018 한국융합학회논문지 Vol.9 No.8

사물인터넷 시대에는 사물들이 유무선 네트워크로 서로 연결되어 필요할 때마다 정보를 주고 받는다. 채널과 네트워 크 환경은 시간에 따라 변하고 잡음과 간섭 신호가 채널에 혼재하므로 자신이 수신해야 하는 신호가 언제 채널에 존재하는 지 판단하는 케리어 센싱 기능이 매우 중요하다. 무선 통신 시스템의 케리어 센싱 회로는 수신기의 수신감도를 결정짓고, 수신감도는 시스템의 서비스 커버리지와 서비스 품질과 밀접한 연관이 있다. 수신감도가 낮을수록 서비스 커버리지가 증가 하지만 노이즈에 민감해지고, 수신감도가 높을수록 서비스 커버리지는 감소하는 반면에 노이즈에 둔감해 진다. 그러므로 수신감도와 노이즈 민감도 관점에서 최적의 케리어 센싱 설계와 최적화가 매우 중요하다. 본 논문에서는 장거리 사물인터넷 을 위해 수신감도의 최적화 관점에서 효과적인 케리어 센싱 기법을 제안한다. In the Internet of Things (IoT) era, objects are connected to each other by wired and wireless networks, and information is exchanged whenever necessary. Channel and network environments change over time; thus, a carrier sensing function that identifies whether signals containing information are present in the channel is essential. The carrier sensing circuit of a wireless communication system determines the receiver sensitivity, and the receiver sensitivity is closely related to the service coverage and service quality of the system. As the receiver sensitivity decreases, the service coverage increases but it becomes sensitive to noise. However, as the receiver sensitivity increases, the service coverage decreases but it becomes insensitive to the noise. Therefore, carrier sensing design and optimization are very important from the viewpoint of the receiver sensitivity and noise sensitivity. This paper proposes an effective carrier sensing technique from the viewpoint of the receiver sensitivity for the long range IoT.

刈取回數에 따른 Miscanthus sinensis의 生産性에 關한 硏究

李一球,李浩俊,金源 건국대학교 1975 文理論叢 Vol.4 No.1

This experiment deals with the clipping frequency. in the community of Miscanthus sinensis. The materials fire clipped on the two sites of the artificial and the natural communities. The experimental communities occupy thirty square meters. The quadrat is devided into four plots: A, B, C and D. A plot is clipped five times, B plot three times, C plot two times, and D plot ore time respectively. The under-ground part is stratified into four layers for the stratification analysis of the production. The results are summarized as follows: 1. The artificial community in more abundant in the production than that of the natual community generally, The production, the total dry weight is most abundant at the B plot (three times of the clippping) in the two sites of the natural and the artificial communities, and B, C, A and D plot are followed in the written order. 2. The nutritive value is in the inverse production to the clipping frequency in general. 3. The production of the underground part is most abundant in the upper stratification, and it decreased in accordance with the stratification going down.