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보조 및 관리 단말을 갖는 새로운 시공간 협동 다이버시티 중계 전략
김은기,김영주,이인성,Kim, Eun-Ki,Kim, Young-Ju,Lee, In-Sung 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.1A
본 논문에서는 다중-홉(multi-hop) 무선통신시스템에서 보조 및 관리단말을 추가로 갖는 시공간 협동 다이버시티 중계 시스템을 제안한다. 한 협동그룹에 1개 이상의 중계단말을 추가하여, 프레임 에러여부 및 채널정보 등의 상태정보만을 공유한다. 상태가 좋은 수신신호를 가지는 단말을 선택하여, 선택된 각 중계단말은 같은 시공간 부호로 다중안테나 송신다이버시티 중계전송을 한다. 그리고 협동그룹 내에 중계단말 간의 교신 프로토콜을 제안한다. 이 방식에 대해, 수신신호 대 송신신호 비($E_r/E_s$)를 측정하여 성능개선 됨을 증명하였으며, 플랫 페이딩 (flat-fading) 채널에서의 시뮬레이션은 기존의 협동다이버시티에 비해 혁신적인 성능향상을 보인다. A new space-time cooperative communication relaying strategy with assistant or management terminals is proposed in multi-hop wireless communication systems. More than one relaying terminals are included in one cooperative group to share the state information such as frame error rate and channel information. Among the cooperative group, the best ones are selected to send bit information using space-time codes. An implementation for the proposed scheme is also presented using a TDMA cooperative protocol. Receive signal to transmit signal ratio($E_r/E_s$) and computer simulation show the strategy outperform the conventional cooperative system.
김은기,이택종 대한미용성형외과학회 2008 Archives of Aesthetic Plastic Surgery Vol.14 No.1
Rohrich et al. first studied transverse position of umbilicus and showed it was not in the midline in more than 98% of the subjects without history of abdominal procedures. This study aimed to investigate whether the lateral deviation of umbilicus is affected by pregnancy history. Among those patients who underwent immediate breast reconstruction between 2004.3 and 2006.3, 147 consecutive patients without history of abdominal procedures, ascites, and hernia were included. 28 patients were nulliparous whereas 119 were parous. Before the operation, the percentage difference from expected midline was calculated and compared between the two groups, and the rate of the midline umbilicus was also compared. Mean percentage difference was 1.54% in the parous, and 1.70% in the nulliparous, which demonstrated no significant difference. The rate of the midline umbilicus was 27.7% in the parous, and 32.4% in the nulliparous group and there was no significant difference. This study confirmed the lateral deviation of umbilicus in more than two-third of the Korean women and clarified this deviation is innate, not caused by pregnancy history. This common and normal deviation should be evaluated and mentioned preoperatively for abdominal procedures including TRAM and abdominoplasty, because it is an issue that may cause litigation.
김은기 한국정보법학회 2009 정보법학 Vol.13 No.2
This paper has aimed at providing deeper insight into the legal theory and practices of withdrawal of frequency assignments and spectrum refarming in Korean Radiowave Act. As such it could be used as a guide of compensation by Administrations on spectrum withdrawal & refarming which is a good spectrum management tool that can be used to satisfy new market demands and increase spectrum efficiency. The main theme has been the introduction of spectrum withdrawal and refarming as a part of the overall spectrum management activities and the compensation incurred by spectrum withdrawal and refarming. In addition to the theoretical aspects of withdrawal and refarming the legal instruments of withdrawal & refarming and compensation issues caused thereof have been investigated. Refarming funds to compensate premature withdrawal has been established in Korea, but it is notable that newly adopted direct compensation to the old user by the new user is a good tool to introduce spectrum trading. 이 글은 현행 전파법상의 주파수 회수․재배치와 관련하여 그 법리적 문제와 실무적 문제를 살펴보는 것을 목적으로 하였다. 그렇게 함으로써 새로운 주파수시장의 수요를 만족시키고 주파수 이용효율을 높일 수 있는 주파수 회수․재배치에 따라 발생하는 손실보상의 처리에 도움이 될 수 있도록 하였다. 이 글은 주파수 관리체계에서 중요하게 등장하고 있는 주파수 회수․재배치의 법률요건과 법률효과를 살펴보기 위하여 과연 주파수가 어떠한 법적 성질을 가지고 있는지 또 주파수 이용권이 어떠한 것인지, 그리고 주파수 회수․재배치가 가능한 경우와 손실보상의 대상과 범위를 주된 논의의 대상으로 하였다. 주파수 회수․재배치에 따른 손실보상은 정보통신진흥기금으로 이루어지는데, 이러한 방송통신위원회에 의한 손실보상 이외에 우리 전파법은 시설자등에 의한 직접보상이 가능하도록 규정하고 있다. 이러한 시설자등에 의한 직접보상은 법리적 문제를 안고 있기는 하지만 무선시설에 대한 시장가치에 따른 평가가 이루어질 수 있는 주파수 매매를 도입하는 길이 될 수 있다는 점에서 바람직하다고 할 수 있다.
The Theory of Structuration and Multidimensional Theory: New Classics?
김은기 한국사회학회 2009 韓國社會學 Vol.43 No.3
Few would challenge the notion that social reality is created by human agents operating in the pre-existing social structure. However, social theorists are divided over how structure and agencies are related. Anthony Giddens’ structuration theory and Jeffrey Alexander’s multidimensional theory represent efforts to overcome the basic dualism of “interpretative” and “structural” sociology. Both theories attempt to explain the historical processes engendering the structures that mold human social life and strive to overcome the problem of dualism between structure and agency. In this paper, Giddens’ structuration theory and Alexander’s multidimensional theory are assessed in light of the question of whether they have contributed any insights not already anticipated in the classical tradition of sociological thinking. The paper argues that both Giddens and Alexander largely fail to accomplish this task of convergence. It is also argued that while Giddens work shows an inclination toward a micro direction, Alexander ultimately leans toward an extreme macro level of social reality.