X선관의 실효초점 측정에 관한 고찰

장광현,임오수,김형기,송창욱,정경모,정환 대한방사선과학회(구 대한방사선기술학회) 1993 방사선기술과학 Vol.16 No.1

Teleradiology

장광현,Jang, Gwang-Hyeon 대한디지털의료영상학회 1997 대한디지털의료영상학회논문지 Vol.3 No.1

DESIGN FRAMEWORK FOR FLEXRAY NETWORK PARAMETER OPTIMIZATION

장광현,박인석,한재현,이강윤,선우명호 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.4

Because the FlexRay protocol has more than 70 configuration parameters and these parameters correlate with each other, designing a FlexRay network is a complex and difficult task. In this study, we propose a design framework that optimizes the two main FlexRay network parameters that are highly relevant to the application algorithm. The design process is composed of two steps for optimizing parameters. In the first step, the static slot length is optimized using a frame-packing algorithm. This algorithm binds network signals into static frames based on their periods and signal groups. In the second step, the communication cycle length is optimally designed with frame-scheduling algorithm and worst-case reponse time analysis. Based on the frame-scheduling algorithm, the response times are analyzed. The proposed design framework was applied to a unified chassis control system as a case study, and the analytical results were verified.

머신러닝을 활용한 온라인교육 발전방향과 기술과제

장광현,이재인 한국지능정보시스템학회 2020 한국지능정보시스템학회 학술대회논문집 Vol.2020 No.11

Feeding behavior of the copepod Temora turbinata: clearance rate and prey preference on the diatom and microbial food web components in coastal area

장광현,Hideyuki Doi,Yuichiro Nishibe,남귀숙,Shin-ichi Nakano 한국생태학회 2014 Journal of Ecology and Environment Vol.37 No.4

Feeding behavior of Temora turbinata was investigated through laboratory experiments with special emphasis on its foodpreference and consequent clearance rate on diatom and microbial components given as common natural food assemblageof coastal area (Uchiumi, Uwa Sea, Japan). Among available prey items, T. turbinata showed the highest clearancerate for Thalassiosira spp. (0.23 ± 0.08 L Temora-1 day-1) followed by Chaetoceros spp. (0.11 ± 0.03 L Temora-1 day-1), butclearance rates for other diatom, Nitzschia spp. was lower (0.03 to 0.07 L Temora-1 day-1). Bacterial abundances showed noresponse against 24-h feeding of T. turbinata. Feeding of T. turbinata on heterotrophic nanoflagellates (HNF) was apparentwhen clearance rates of T. turbinata on diatoms were relatively low, but T. turbinata did not consume HNF as well asciliates with Thalassiosira spp. of which clearance rate was highest. The results suggest that HNF and ciliates are possiblesupplementary prey item for T. turbinata, but their contribution as food sources can be limited by the presence of otherprey items such as preferable diatom species.

한반도 유사시 유엔사(UNC)의 전력 창출에 관한 연구: 현대전쟁을 통해 본 미국 주도의 다국적군 참여 배경을 중심으로

장광현,최승우,홍성표 국방대학교 국가안전보장문제연구소 2017 국방연구 Vol.60 No.4

The current situation on the Korean Peninsula is more severe than ever. With North Korea having conducted their Sixth Nuclear Test and having declared “completion of nuclear force” after the launching of ICBM Hwaseong-15, US is more sensitive than ever about the threat against its mainland and is suggesting possibility of a ‘military measure’ on a daily basis. Now is the time to prudently prepare for a possible contingency on the Peninsula. If we look at the nations that have participated in multinational coalitions based on US requests in major conflicts involving US around the new millenium-including the Gulf War, War in Afghanistan, Iraq War, etc.-we can observe various motives and circumstances including having been pressured by a superpower in the from of US, desire to sustain a relationship with the US, practical pursuit of domestic political·security·economic benefits, etc. We can also observe some nations that hesitated to participate in such coalition or behaved passively, citing domestic circumstances as reasons. Also, there was a clear tendency of-despite having dispatched their forces-prioritizing the safety of their own troops. If war breaks out on the Peninsula again, it is likely that a US-led multinational coalition force will be formed like in many other modern conflicts, and the UNC Sending States will form the core of that coalition. But based on lessons learned from as well as characteristics of various modern conflicts, we cannot be certain that the UNC Sending States will willingly volunteer to send their troops based on the Washington Declaration that was made sixty four years ago. It is not an easy decision for any nation to decide to set their step on the ‘flaming sauna’ of the Korean Peninsula despite concerns for mass casualty, domestic anti-war sentiments, as well as intertwined interests of various powerful nations. Republic of Korea must place importance on the function of UNC that provides much-needed forces in case of a contingency on the Peninsula, especially from a strategic perspective in consideration of the future after the transfer of war-time OPCON. Furthermore, Republic of Korea must break away from its position of being a passive receiver of UNC forces, must realize that itself is also a member of UNC, must actively participate in efforts to revitalize UNC, and finally must strengthen its friendly relationships with individual UNC Sending States that will be provided forces in times of contingency. 북한이 제 6차 핵실험, 신형 ICBM급 화성-15형 발사 이후 ‘핵무력 완성’ 선포 등 연이은 대미 전략적 도발에 대해, 미국은 미 본토에 대한 위협을 의식한 극도의 예민한 반응과 함께 ‘군사적 조치’ 가능성을 연일 내비치고 있어 작금의 한반도 정세는 그 어느 때보다 매우 엄중하다. 유비무환의 자세로 한반도 유사시에 대비해야 할 때이다. 2000년도를 전후하여 미국이 치룬 걸프전쟁과 아프간전쟁, 이라크전쟁 등 주요 현대전에서 미국의 요청에 의거 다국적군에 참여한 국가들의 면면을 살펴보면, 초강대국 미국과의 압력과 강요에 의해, 또는 미국과의 지속적인 관계 유지를 위해, 자국의 정치·안보·경제적 실리를 추구할 목적으로, 미국의 정치·경제적 보상이나 지원을 기대하는 등 그 참전 이유와 배경이 매우 다양하였다. 반면 일부 국가들은 자국 사정을 이유로 참전을 주저하거나 소극적으로 대응하는 경우도 있었으며, 파병을 하더라도 자국군의 안전을 우선적으로 염려하는 경향이 뚜렷하였다. 만약 한반도에서 전쟁이 재발한다면 현대전에서와 같이 미국의 주도 하에 다국적군을 결성할 가능성이 매우 크며, 이는 유엔사 회원국이 주축이 될 것이다. 그러나 현대전쟁의 양상과 교훈에 비춰볼 때, 64년 전「워싱턴 선언」을 근거로 유엔사 회원국들이 전투병력을 선뜻 파견해 줄 것이라고 기대하기는 미지수이다. 어느 국가이든 대량 인명피해에 대한 우려와 자국의 참전반대 여론을 무릅쓰고 강대국들의 이해관계가 얽힌 한반도의‘끓는 불가마’속으로 발을 내딛기는 결코 쉬운 결정이 아니다. 한국은 전작권 전환 이후를 내다보는 보다 전략적인 안목에서 한반도 유사시 한반도에 긴요한 전력 제공 임무를 수행하는 유엔사의 순기능을 중시해야 한다. 또한 유엔사에서 제공하는 전력을 지원받는 수동적 입장에서 탈피하여 스스로 ‘유엔사 회원국의 한 구성원’이라는 능동적인 자세로 ‘유엔사 재활성화’ 노력에 적극 동참함은 물론, 유사시 전력을 제공하게 될 유엔사 회원국들과도 개별적인 우호관계를 더욱 강화할 필요가 있다..

한반도 유사시 유엔사(UNC)의 전력 창출에 관한 연구 - 현대전쟁을 통해 본 미국 주도의 다국적군 형성 과정을 중심으로 -

장광현,최승우,홍성표 대구과학대학교 국방안보연구소 2017 사회융합연구 Vol.1 No.3

North Korea continuously provokes to siege strike USsince it declared its successful launch of ICBM, ‘Hwasung-14’ in July this year. In addition to such successful launch of ICBM, North Korea conducted its sixth nuclear test on September 3, and announced its success in developing a hydrogen bomb that could hit the US mainland. Upon such provocation, the US shows possibility of military action for preventive war, making the situation in the Korean Peninsula sever than ever before. North Korea increases such confrontations with the US as a tactic to maintain its regime survival while the US responds sharply to the threat of attack on its mainland. In such situation where trial of strength between the two countries is reaching the red line, it is necessary to take interest in the UNC which offers military forces in the event of crisis in the Korean Peninsula. As we look into the modern war history such as the Gulf War and the Afghanistan War, we can understand there were different backgrounds in countries participating in the US-led multinational forces. Apart from voluntary coalition partners, most countries participated in such forces to gain political, security, economical benefits from their continuous relationship with the US or anticipated political and economical compensation support from the US. Some countries were hesitant or unwilling to join forces due to opposing public opinion and fears for the safety of dispatched troops, which led to deteriorating their relationships with the US. Moreover, preference of carrying out humanitarian operations in safe areas rather than combat areas was even seen in countries that decided to dispatch their troops due to consideration of the troop's safety. Through the examined two modern war cases, we can foresee the difficulties in building US-led multinational military forces in time of emergency in the Korean Peninsula. Though it is important for the UNC nations to retain their relationship with the US and keep their international commitment to defend the Peninsula in crisis, they still feel burdened and are unwilling to fight against North Korea. It is doubtful whether nations will dispatch their troops when they face the possibility of economic retaliation of China who advocates North Korea and must send their troops to a battle where North Korea arms itself with ABC weapons(Atomic, Biological, and Chemical) which will result in mass casualties. Therefore, South Korea needs to newly acknowledge the importance of the UNC as a "warring party" in the event of crisis in the Korean Peninsula. Joint participation in the revitalization of the UNC, which is being steadily promoted under the US-led alliance, should be strengthened in addition to reinforcing friendly relationship with the individual UNC nations who would provide military support in time of war. 본 考에서는 주요 현대전쟁을 분석하여 미국이 다국적군을 형성하게 된 일련의 과정과 일부 참전국들의 참전 동기, 그리고 이들 국가들이 참전 또는 지원을 결정하기까지의 과정들을 살펴보기로 한다. 이를 통하여 한반도 유사시 유엔사 전력제공국들을 포함한 다수의 국가들이 참전을 결정하는데 있어서 자국 내에서 또는 미국과 자국 간에 어떠한 갈등요소가 내재할 것인지, 어떻게 하면 이를 극복하여 개전 초기부터 국제적인 지지와 협력을 이끌어내어 압도적인 승리의 발판을 삼을 것인지에 대해 정책적인 대안을 제시하고자 한다.

메소코즘을 이용한 지각류, 요각류 및 패 충류의 섭식 성 향 분 석; 탄소, 질 소 안정동위원소비의 믹싱모델 (R package SIAR)을 이용한 정량 분 석

장광현,서동일,고순미,Sakamoto Masaki,남귀숙,최종윤,김민섭,정광석,나긍환,김현우 한국수생태학회(구 한국하천호수학회) 2016 생태와 환경 Vol.49 No.4

Stable Isotope Analysis (SIA) of carbon and nitrogen is useful tool for the understanding functional roles of target organisms in biological interactions in the food web. Recently, mixing model based on SIA is frequently used to determine which of the potential food sources predominantly assimilated by consumers, however, application of model is often limited and difficult for non-expert users of software. In the present study, we suggest easy manual of R software and package SIAR with example data regarding selective feeding of crustaceans dominated freshwater zooplankton community. We collected SIA data from the experimental mesocosms set up at the littoral area of eutrophic Chodae Reservoir, and analyzed the dominant crustacean species main food sources among small sized particulate organic matters (POM, <50 μm), large sized POM (>50 μm), and attached POM using mixing model. From the results obtained by SIAR model, Daphnia galeata and Ostracoda mainly consumed small sized POM while Simocephalus vetulus consumed both small and large sized POM simultaneously. Copepods collected from the reservoir showed no preferences on various food items, but in the mesocosm tanks, main food sources for the copepods was attached POM rather than planktonic preys including rotifers. The results have suggested that their roles as grazers in food web of eutrophicated reservoirs are different, and S. vetulus is more efficient grazer on wide range of food items such as large colony of phytoplankton and cyanobacteria during water bloom period.

저수지화 성향을 띤 낙동강에서 치어 섭식이 동물플랑크톤 군집에 미치는 영향

장광현,황순진,장민호,김현우,정광석,주기재 한국수생태학회(구 한국하천호수학회) 2001 생태와 환경 Vol.34 No.4

수자원 관리와 먹이망, 안정동위원소

장광현,Jang, Gwang-Hyeon,Doi, Hideyuki 한국수자원학회 2011 물과 미래(한국수자원학회지) Vol.44 No.12