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Kangsan Kim(김강산),Gi-Dong Sim(심기동),Dongwoo Lee(이동우) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
나노 트윈 (Nanotwin) 구조를 갖는 금속재료는 높은 열 안정성과 뛰어난 기계물성, 그리고 낮은 전기 저항을 가져 주목받고 있다 [1, 2]. 나노 트윈 구조는 합금의 적층 결함 에너지 (Stacking fault energy) 가 낮을 때 잘 형성되는 것으로 보고되고 있다 [3, 4]. 이에 착안하여, 최근 제1 원리 계산을 이용하여 여러 금속에 대한 적층 결함 에너지를 예측하고, 나노트윈 구조가 쉽게 형성되는 금속을 개발하려는 연구가 활발히 진행 중에 있다. 금속 합금은 여러 원소를 다양한 비율로 섞음으로써 만들 수 있기 때문에 그 조합 가능성이 매우 많은데, 나노 트윈 형성이 용이한 조성을 탐색하기 위해 기존의 제1 원리 계산을 이용하기에는 많은 시간과 컴퓨터 자원을 필요로 한다. 본 연구에서는 이러한 단점을 극복하고, 나노트윈 형성이 잘 되는 합금을 신속히 개발하기 위한 방법을 소개한다. 문헌으로부터 확보한 다양한 합금에 대해 가우시안 프로세스 회귀법 기반의 머신 러닝을 이용하여 적층 결함에너지를 모델링했으며 이를 Ni 기반의 3 원계 합금 내 조성 별 적층결함 에너지를 예측하는 데 이용했다. 이후 해당 합금에 대해 조합 합성 (Combinatorial synthesis) 및 고속대량스크리닝기법 (High-throughput screening method) 방법을 이용, 예측된 적층 결함에너지에 따라 달라지는 기계적, 전기적 실험 물성을 매핑했다. 미세구조에 대한 머신 러닝 결과를 실험 데이터와 비교 분석하며, 조성-미세구조에 따라 달라지는 Ni 기반 3 원계 합금의 기계/전기적 물성에 대해 기술한다.
무인기 데이터링크 보안을 위한 내장형 하드웨어 암호화 장치의 설계
김강산(Kangsan Kim),부정일(Jungil Boo),맹성재(Sungjae Meang),민세홍(Sehong Min) 항공우주시스템공학회 2018 항공우주시스템공학회 학술대회 발표집 Vol.2018 No.11
본 논문에서는 스푸핑 공격에 대한 무인기 데이터링크의 보안을 확보를 위하여 데이터링크 단말 장치에 적용 가능한 내장형 하드웨어 암호화 처리 장치의 요구조건을 분석하고 설계 방안을 제안한다. 고속의 하드웨어 기반의 암호 연산 및 데이터 처리를 통해 링크의 지연시간을 최소화 하였으며 SWaP(Size, Weight and Power) 제약조건에 부합하는 암호화 장치를 구현하여 그 성능을 검증하였다.
군 유해환경작업장 및 근무 장병의 보건관리 개선방안 연구
김강산 ( Kim Kangsan ),하상윤 ( Ha Sangyun ),최경자 ( Choi Kyungja ),박진옥 ( Park Jinok ) 국군의무사령부 2023 대한군진의학학술지 Vol.54 No.1
Objective We intended to examine the overall reality of military working environment and health management for workers and to suggest practical improvement and management plans. Method Current laws such as the Occupational Safety and Health Act and the military work environment and worker health management directives were compared and reviewed, and related literature was investigated. Results There are many factors that need to be systematically established and improved in the current military working environment and health management for workers, and it is necessary to introduce a sustainable and effective management method. The most basic, important, and precedent is to secure accurate material safety data sheets and use it in connection with on-site surveys, environmental measurements, and occupational health examinations based on it. In addition, an organization composed of experts in each field will continuously visit and provide in-depth consulting so that practical occupational health management can be achieved consistently. Conclusion In the Occupational Safety and Health Act, a systematic and diverse system for the workplace and workers has been established for a long time. However, in the military, the application of this is still in its infancy, so a policy that can be applied in stages is needed. Military organizations have a systems in place that allow them to communicate and report quickly and accurately through intranets, which is much better than society, so it's easy to build up.
군부대 급식시설 취사 중 공기 질 및 유해인자 정량평가
김강산 ( Kangsan Kim ),하상윤 ( Sangyun Ha ),강차수 ( Chasu Kang ),윤여순 ( Yuhsun Youn ),최경자 ( Kyungja Choi ),박진옥 ( Jinok Park ),최수정 ( Sujung Choi ),우현지 ( Hyunzi Woo ) 국군의무사령부 2022 대한군진의학학술지 Vol.53 No.1
Objective: Recently, health impairments of workers exposed to cooking fumes for a long period of time have become a social concern. The aim of this study was to evaluate various harmful factors quantitatively, which could be produced during the cooking process at selected military catering facilities. Method: Six military cooking workplaces were selected as sample sites, and the samples for air pollutant measurement were collected while preparing lunch. The samples were collected using direct reading equipments or personal sample collectors. Air pollutants including fine dust, ultrafine dust, polycyclic aromatic hydrocarbons (PAHs), total volatile organic compounds (TVOCs), carbon monoxide (CO) and carbon dioxide (CO2) were analyzed quantitatively. Results: The concentrations of fine dust and ultrafine dust were higher than the recommended general indoor air quality limitations of the Korean government. Otherwise, there were no factors that exceeded the current government's standards. The criteria of the statutory standards for indoor air quality and the exposure criteria for chemicals and physical factors of the relevant law were referenced. Conclusion: The overall air quality at selected military catering facilities was relatively good, however, harmful factors such as cooking fumes generated during the cooking process can vary depending on multiple factors such as daily menus, cooking methods and operating conditions of ventilation facilities. So, to improve workplace environments, appropriate operating standards applicable to cooking facilities should be developed and continuously monitored.
김강산 ( Kim Kangsan ),하상윤 ( Ha Sangyun ),최경자 ( Choi Kyungja ) 국군의무사령부 2023 대한군진의학학술지 Vol.54 No.1
Objective Among military sports facilities, most futsal stadiums have artificial turf floors. Synthetic resin fibers and filler rubber powders that make up artificial grass contain various harmful chemicals, but this survey study was needed because no fact-finding survey was conducted on their harmfulness. Method Of the 1,068 artificial turf fields installed in the army, 24 were selected according to the year of installation, and solid samples of artificial grass constituents were collected. Heavy metals(4 types), soluble metals(14 types), phthalates(6 types), polycyclic aromatic hydrocarbons(18 types), and total volatile organic compounds(4 types) were quantitatively analyzed using a precision analyzer. Results Hazardous chemicals were detected in 9(37.5%) of the 24 artificial turf facilities to be measured, and in 3 of them (12.5%), they exceeded the permissible standard. There was no correlation between the year of installation of artificial turf and the concentration distribution of harmful chemicals. Conclusion As a result of this investigation, harmful chemicals in some items (PAHs) of the artificial turf facilities of the Army were over-detected, but this does not mean that they are directly related to exposure and health problems for soldiers. It is only a basic environmental factor in risk assessment for the possibility of exposure to hazardous chemicals. Therefore, it is necessary to conduct related studies such as direct exposure evaluation of artificial turf facility users through the skin and respiratory tract or a comparison of human metabolic exposure index substances in high-risk soldiers and the control group for hazardous chemicals.