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이해동(Haedong Lee),박남제(Namje Park),최두호(Dooho Choi),정교일(Kyoil Chung) 한국정보보호학회 2008 情報保護學會誌 Vol.18 No.6
현재 널리 쓰이고 있는 다양한 형태의 모바일 디바이스들을 무선 센서 네트워크 환경에 접목하여 보다 편리하고 효율적으로 센서 네트워크 서비스를 제공 받을 수 있는 모바일 USN(Ubiquitous Sensor Network) 서비스 기술을 소개하고, 그 응용 서비스 모델인 Nike 플러스 i-Pod 스포츠 키트 플랫폼에 대해 살펴본다. 그리고, 해당 서비스의 보안취약성을 분석하여 모바일 USN에서의 보안 및 프라이버시 문제를 제시하고, 향후 제공되어질 다양한 모바일 USN 보안 응용 서비스들에 대해 고찰해본다.
정다은 ( Chung Daeun ),김해동 ( Haedong Kim ) 한국현대영어영문학회 2017 현대영어영문학 Vol.61 No.1
This study aims to investigate Korean adult leaners` recognition and attitudes towards different pronunciations found in world Englishes. A total of 73 English learners participated in the verbal guise technique that asked the learners to listen to the real verbal performances of five different varieties of Englishes and to answer questions concerning perception and attitudes toward them. The results showed that the learners could recognize American English best and revealed the most favorable attitudes toward it. Most of the respondents perceived that their own pronunciation resembled American English. The results also indicated more positive attitudes toward American, British and Australian Englishes compared to Chinese-accented and Filipino-accented Englishes in formal communication situations. These results suggest the following implications: Teachers need to introduce varieties of Englishes in the classroom via authentic materials in order to develop Korean adult learners` awareness of world Englishes pronunciation. (Hankuk University of Foreign Studies).
Junghyun Lee,Haedong Kim,Hyun Chung,Kwanghee Ko 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.1
Given the unpredictability of the space environment, satellite communications are manually performed by exchanging telecommands and telemetry. Ground support for orbiting satellites is given only during limited periods of ground antenna visibility, which can result in conflicts when multiple satellites are present. This problem can be regarded as a scheduling problem of allocating antenna support (task) to limited visibility (resource). To mitigate unforeseen errors and costs associated with manual scheduling and mission planning, we propose a novel method based on a genetic algorithm to solve the ground support problem of multiple satellites and antennae with visibility conflicts. Numerous scheduling parameters, including user priority, emergency, profit, contact interval, support time, remaining resource, are considered to provide maximum benefit to users and real applications. The modeling and formulae are developed in accordance with the characteristics of satellite communication. To validate the proposed algorithm, 20 satellites and 3 ground antennae in the Korean peninsula are assumed and modeled using the satellite tool kit (STK). The proposed algorithm is applied to two operation modes: (i) telemetry, tracking, and command and (ii) payload. The results of the present study show near-optimal scheduling in both operation modes and demonstrate the applicability of the proposed algorithm to actual mission control systems.
Lee, Junghyun,Kim, Heewon,Chung, Hyun,Kim, Haedong,Choi, Sujin,Jung, Okchul,Chung, Daewon,Ko, Kwanghee The Korean Society for Aeronautical Space Sciences 2018 International Journal of Aeronautical and Space Sc Vol.19 No.1
In this paper, we propose a method that uses a genetic algorithm for the dynamic schedule optimization of imaging missions for multiple satellites and ground systems. In particular, the visibility conflicts of communication and mission operation using satellite resources (electric power and onboard memory) are integrated in sequence. Resource consumption and restoration are considered in the optimization process. Image acquisition is an essential part of satellite missions and is performed via a series of subtasks such as command uplink, image capturing, image storing, and image downlink. An objective function for optimization is designed to maximize the usability by considering the following components: user-assigned priority, resource consumption, and image-acquisition time. For the simulation, a series of hypothetical imaging missions are allocated to a multi-satellite control system comprising five satellites and three ground stations having S- and X-band antennas. To demonstrate the performance of the proposed method, simulations are performed via three operation modes: general, commercial, and tactical.
Lee, Junghyun,Kim, Haedong,Chung, Hyun,Ko, Kwanghee The Korean Society for Aeronautical and Space Scie 2016 International Journal of Aeronautical and Space Sc Vol.17 No.1
Given the unpredictability of the space environment, satellite communications are manually performed by exchanging telecommands and telemetry. Ground support for orbiting satellites is given only during limited periods of ground antenna visibility, which can result in conflicts when multiple satellites are present. This problem can be regarded as a scheduling problem of allocating antenna support (task) to limited visibility (resource). To mitigate unforeseen errors and costs associated with manual scheduling and mission planning, we propose a novel method based on a genetic algorithm to solve the ground support problem of multiple satellites and antennae with visibility conflicts. Numerous scheduling parameters, including user priority, emergency, profit, contact interval, support time, remaining resource, are considered to provide maximum benefit to users and real applications. The modeling and formulae are developed in accordance with the characteristics of satellite communication. To validate the proposed algorithm, 20 satellites and 3 ground antennae in the Korean peninsula are assumed and modeled using the satellite tool kit (STK). The proposed algorithm is applied to two operation modes: (i) telemetry, tracking, and command and (ii) payload. The results of the present study show near-optimal scheduling in both operation modes and demonstrate the applicability of the proposed algorithm to actual mission control systems.
Preliminary PINC(Program for the Inspection of Nickel Alloy Components) RRT(Round Robin Test)
Kyungcho Kim,Sungsik Kang,Hosang Shin,Kukab Chung,Myungho Song,Haedong Chung 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.3
After several damages by PWSCC were found in the world, USNRC and PNNL(Pacific Northwest National Laboratory) started the research on PWSCC under the project name of PINC. The aim of the project was 1) to fabricate representative NDE mock-ups with flaws to simulate PWSCCs, 2) to identify and quantitatively assess NDE methods for accurately detecting, sizing and characterizing PWSCCs, 3) to document the range of locations and morphologies of PWSCCs and 4) to incorporate results with other results of ongoing PWSCC research programs, as appropriate. Korea nuclear industries have also been participating in the project. Thermally and mechanically cracked-four mockups were prepared and phased array and manual ultrasonic testing(UT) techniques were applied. The results and lessons learned from the preliminary RRT are summarized as follows: 1) Korea RRT teams performed the RRT successfully. 2) Crack detection probability of the participating organizations was an average 87%, 80% and 80% respectively. 3) RMS error of the crack sizing showed comparatively good results. 4) The lessons learned may be helpful to perform the PINC RRT and PSI/ISI in Korea in the future.
일개 항공기 정비시설의 화학물질 노출의 정성 및 정량 노출평가
백기욱 ( Baek Kiook ),김민석 ( Kim Minseok ),박해동 ( Jang Konghwa ),장공화 ( Park Haedong ),정은교 ( Chung Eunkyo ) 국군의무사령부 2019 대한군진의학학술지 Vol.50 No.1
Objectives; To evaluate exposure of chemicals, especially organic solvent, of aircraft maintenance facility in Korean army. Methods; We sampled bulk sample of solvent and air sample from maintenece facility workplace; cleaning and painting process. Air sampling was done by area sampling and personal sampling method. Analysis of sampling was done by gas chromatography/ mass spectrometry. Results; Benzene, heptane, toluene, ethylbenzene, xylene were detected among cleaning process. Comparison of TLV limit value, benzene was detected at a level of 22% of time weighted average level. Toluene, ethylbenzene, xylene were detected among painting process. Conclusions; We detected several organic solvents which is not enlisted on material safety data sheet. Carcinogenic or reproductive toxic agents were detected. Although the level was lower than exposure limit, safetly and health issues of workers should be concerned.
Preliminary Round Robin Test(RRT) for Program for the Inspection of Nickel Alloy Components(PINC)
Kyungcho Kim,Sungsik Kang,Hosang Shin,Myungho Song,Haedong Chung,Yongsik Kim 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.3
After several PWSCCs were found in Bugey(France), Ringhals(Sweden), Tihange(Belgium), Oconee, Arkansas, Crystal Fever, Davis-Basse, VC Summer(U.S.A.), Thuruga(Japan), USNRC and PNNL started the research on PWSCC, that is, the PINC project. USNRC required KINS to participate in the PINC project in May 2005. KINS organized the Korean consortium at March 2006 and Pre-RRT for RVHP were performed for the preparation of PINC RRT. Through these preliminary RRT, Korea NDE teams can learn and develop the detection and sizing technique for RVHP dissimilar metal weld. These techniques are now being prepared in Korea and need to be utilized for the In-service inspection of the RVHP and BMI of Korea Nuclear Power Plants. PINC RRT mock-ups will be helpful to training.
Kim, Kyoung-Ran,Kang, Seong Jae,Lee, A-Young,Hwang, Dohyeon,Park, Miri,Park, Haedong,Kim, Sanghee,Hur, Kahyun,Chung, Hak Suk,Mao, Chengde,Ahn, Dae-Ro IPC Science and Technology Press 2019 Biomaterials Vol.195 No.-
<P><B>Abstract</B></P> <P>Enormous efforts have been made to harness nanoparticles showing extravasation around tumors for tumor-targeted drug carriers. Owing to the complexity of in vivo environments, however, it is very difficult to rationally design a nanoconstruct showing high tumor specificity. Here, we show an approach to develop tumor-specific drug carriers by screening a library of self-assembled nucleic acid cages in vivo. After preparation of a library of 16 nucleic acid cages by combining the sugar backbone and the shape of cages, we screened the biodistribution of the cages intravenously injected into tumor-bearing mice, to discover the cages with high tumor-specificity. This tumor specificity was found to be closely related with serum stability, cancer cell uptake efficiency, and macrophage evasion rate. We further utilized the cages showing high tumor specificity as carriers for the delivery of not only a cytotoxic small molecule drug but also a macromolecular apoptotic protein exclusively into the tumor tissue to induce tumor-specific damage. The results demonstrate that our library-based strategy to discover tumor-targeted carriers can be an efficient way to develop anti-cancer nanomedicines with tumor specificity and enhanced potency.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A library of 16 nucleic acid cages has been prepared and screened for high tumor specificity in vivo. </LI> <LI> The tumor-specificity was found to be closely related with serum stabilitycellular uptake efficiency of cages. </LI> <LI> Highly tumor-specific cages have been employed as carriers for the tumor-targeted delivery of apoptotic molecules. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>