실시간 빅데이터 처리 플랫폼을 이용한 공공데이터 분석 설계

박정민(JeongMin Park),최승호,김태훈,노재춘(Jaechun No) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6

플러그인 하이브리드 전기자동차의 Utility Factor 및 연비 산정

박정민(Jeongmin Park),정환중(Hwanjung Jung),이진욱(Jinwook Lee) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11

서브샘플링 직접변환 수신기용 광대역 증폭기 및 High-Q 대역통과 필터

박정민(Jeongmin Park),윤지숙(Jisook Yun),서미경(Mikyung Seo),한정원(Jungwon Han),최부영(Booyoung Choi),박성민(Sung Min Park) 대한전자공학회 2008 電子工學會論文誌-SD (Semiconductor and devices) Vol.45 No.11

본 논문에서는 서브샘플링 기법을 이용한 직접변환 수신단에 이용할 수 있는 광대역 증폭기와 높은 Q-factor 값을 가지는 대역통과 필터(BPF) 회로를 0.18㎛ CMOS 공정을 이용하여 구현하였다. 광대역 증폭기는 5.4GHz의 대역폭 및 12㏈의 파워이득 특성을 가지며, 대역통과필터는 2.4㎓ Bluetooth 규격에서 동작할 수 있도록 설계하였다. RF 신호가 안테나를 통해 광대역 증폭기와 BPF를 통과한 후의 주파수응답 측정결과를 살펴보면, 2.34㎓에서 18.8㏈의 파워이득과 31㎒의 대역폭을 갖는다. 이는 대역통과 필터의 Q-factor 값이 75로써 매우 높은 선택도(selectivity) 특성을 나타낸다. 또한, 전체 칩은 8.6㏈의 noise-figure 특성과 대역폭 내에서 -12dB 이하의 입력 임피던스 매칭 (S11) 특성을 보이며, 전력소모는 1.8V 단일 전원전압으로부터 64.8㎽ 이고, 칩 면적은 1.0x1.0mm2 이다. In this paper, a cascade of a wideband amplifier and a high-Q bandpass filter (BPF) has been realized in a 0.18㎜ CMOS technology for the applications of subsampling direct-conversion receivers. The wideband amplifier is designed to obtain the -3㏈ bandwidth of 5.4㎓, and the high-Q BPF is designed to select a 2.4㎓ RF signal for the Bluetooth specifications. The measured results demonstrate 18.8dB power gain at 2.34㎓ with 31㎒ bandwidth, corresponding to the quality factor of 75. Also, it shows the noise figure (NF) of 8.6㏈, and the broadband input matching (S11) of less than -12㏈ within the bandwidth. The whole chip dissipates 64.8㎽ from a single 1.8V supply and occupies the area of 1.0x1.0mm2.

인체 조직의 광학 특성을 이용한 근육 움직임 검출

박정민(Jeongmin Park),한재호(Jaeho Han),한승원(Seungwon Han),김근환(Geunhwan Kim),윤용현(Yonghyeon Yun) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7

삼중효용 흡수식 냉동기의 용액 흐름 방식별 특성 비교 시뮬레이션

박정민(Jeongmin Park),정시영(Siyoung Jeong) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6

Triple-effect absorption chiller cycles with different solution flow types were numerically simulated and compared. The simulation was carried out for four different cycles; series flow, parallel flow, modified reverse(MR) flow, and reverse-parallel(R-P) flow which was originally suggested in this study. The series and parallel flow cycle were found to have too high system pressure. The system pressure of the MR flow and R-P was lower than 300kPa, which is important for the development of a real system. The system COP was slightly higher in the R-P flow(1.62) than the MR flow(1.61). Moreover, since the maximum pump inlet temperature is much lower in the R-P flow(72℃) than the MR flow(123℃), the application of expensive high-temperature solution pumps are not necessary. Therefore, the R-P flow is thought to be an optimal flow type for triple-effect absorption chillers.

How Autocrats Fall

Jeongmin Park(박정민),Taehee Whang(황태희) 한국정치학회 2018 한국정치학회보 Vol.52 No.6

전쟁이 국가 정치지도자의 정치생명에 어떤 영향을 주는가는 민주평화론을 비롯하여 국내정치와 국제정치를 연결짓는 연구에 핵심적인 고리라고 할 수 있다. 현재까지 정치지도자의 정치생명에 관한 연구는 정치지도자의 임기가 전쟁의 결과에 따라 어떻게 달라지는지에 주목해 왔다. 그러나 임기변동을 일으키는 주요 국내 행위자를 비롯하여 다른 국내적 요인들과 함께 고려하지 않았다. 본 연구는 전쟁의 결과와 전쟁의 비용 모두를 고려해 전후 경제수준 변화, 전쟁발발 위치, 그리고 사망자 수를 독립변수인 전쟁의 비용으로 개념화하여 전쟁 비용이 종속변수인 지도자 임기에 미치는 영향을 밝힌다. 연구의 두 번째 부분에서는 지도자 임기에 영향을 끼칠 수 있는 국내적 행위자 중 하나인 군대의 이해관계를 고려해 쿠데타 발생을 두 번째 종속변수로 설정한다. 다중회귀분석 결과, 민주주의 국가에서 전쟁비용이 지도자 임기에 미치는 영향은 적지만 비민주국가에서 전쟁 비용의 영향이 크다는 것을 알 수 있었고, 설령 전쟁에서 패배했더라도 해당 국가의 군비지출이 차지하는 비중이 늘었을 때 군사 쿠데타 발생 확률이 현저하게 낮아진다는 것을 알 수 있었다. Are autocrats invulnerable to external factors? Various studies examining the link between war and leader tenure argue that, while military defeat increases democratic leaders’ risk of removal, autocratic leaders are usually exempt from such threats. However, war outcome is a narrow predictor of costs and wins of war. Such arguments also obscure dissimilar domestic actors and interests behind leader removal. Building on these two criticisms, we measure the impact of war costs on leader removal by setting post-war economy, casualty, and war location as war costs variables. We argue that open, regular elections ensure democratic leaders’ tenure is not shortened by external factors unlike in non-democracies. We show that all war costs variables wield significant impact on leader removal in non-democracies while democratic leaders are shielded from such impact even after controlling for military defeat. We then narrow the focus down to one subcategory of leader removal, coup d’etat, and demonstrate that an increased military expenditure share of GDP decreases the likelihood of coup onset even under military defeat, a condition typically associated with higher likelihood of coup onset. The findings raise the necessity of further studying the relation between war and domestic interests, and how this relation in turn impacts a state’s foreign policy decisions.

복소고유치해석에서 모드기여도 인자를 이용한 저주파 스퀼소음 저감

박정민(Jeongmin Park),김현수(Hyunsoo Kim),김흥섭(Heungseob Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3

When brake the car noises and vibrations make us uncomfortable and unstable. And the more technology for the automobile are improved, the more it should consider the drivers emotional sides. This study conducted analysis of Mode Participation Factor(MPF) about frequency that might cause unstability through Complex Eigenvalue Analysis to reduce the low frequency Squeal noise which is one of brake noises. And interpreted sensitivity, frequency and mode of the parts that cause unstability using participation factor that came from the analysis of MPF. Suggested a solution which can reduce low frequency Squeal noise using Structural Dynamics Modification(SDM) by mass loading that is based on the result of sensitivity analysis. Complex Eigenvalue Analysis used a general program called ABQUS and conducted sensitivity analysis using linking index to minimize the effct of other frequencies except targeted frequency. We confirmed mode coupling through mode participation analysis and identified the effect of reducing the low frequency Squeal that came from the result of SDM of parts that have higher level of participation to unstability.

공리적 설계기법을 이용한 차량용 멀티미디어 탑재 모듈의 기구설계

박정민(Jeongmin Park),이종수(Jongsoo Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4

Having information is most important at the present age. Internet is main source of obtaining information<br/> and mobile telecommunication let people communicate each other without any time and space limitation.<br/> Recently, advanced technology in telecommunication makes two-way service possible. So, the mobile internet<br/> service combined internet with mobile telecommunication is widely and rapidly promoted. Therefore user can<br/> transmit and receive a lot of information without time and space restriction using various application<br/> technologies. This paper deals with machinery that makes human do office work conveniently in vehicle<br/> using mobile internet service. Namely, it tries to design mobile internet machinery combining of wireless<br/> payment, GPS module, mobile internet, and mobile office etc. And that can transmit and receive e-mail or<br/> documents etc. This machinery has various objects, and design process has complexity. To reduce trial error<br/> and processing complexity, Axiomatic Design Method is used to design the machinery.

OECD 국가의 가족정책과 아동 삶의 질의 관계: 퍼지셋 질적비교분석

박정민 ( Jeongmin Park ),진미정 ( Meejung Chin ) 대한가정학회 2022 Human Ecology Research(HER) Vol.60 No.4

This study aims to clarify the relationship between family policy and children’s quality of life through an international comparison and to determine which family policy factors contribute to children’s quality of life. The research question is “How can family policies be combined to improve children’s quality of life in terms of health and economy?” It includes nine categories of family policies related to money, service, and leave. Measures of children’s quality of life include low birth weight, infant mortality, and child poverty. Using the OECD Family Database, and the OECD Child Well-being Data, fuzzy-set Qualitative Comparison Analysis (fsQCA) was used among 20 OECD countries. Combinations of family policies significant to the children’s quality of life were derived from the results. This study contributes to the literature by revealing the effectiveness of states’ investment in family policy. In addition, the study indicates that since family policies interact with each other, those policies combine to improve children's quality of life.

공무원의 적극적 성향이 직무수행에 미치는 영향: LMX(Leader-Member Exchange)의 매개효과를 중심으로

박정민(Park, Jeongmin),김태형(Kim, Tae Hyung) 서울행정학회 2021 한국사회와 행정연구 Vol.32 No.3

본 연구는 적극행정이 강조되는 상황에서 실제로 적극적인 공무원의 직무수행이 더 나은지를 실증적으로 규명해보고자 하였다. 리더-구성원 교환관계(LMX)를 매개변수로 고려하여 공무원의 적극적 성향과 개인의 직무수행 간 관계를 구조방정식 모형을 통해 분석하였다. 측정모형 분석결과, 긍정적 직무수행은 과업수행과 상사나 동료를 위한 조직시민행동인 OCBI, 조직을 위한 조직시민행동인 OCBO로, 부정적 직무수행은 반생산적 과업활동으로 적절히 개념화되었다. 구조모형 분석결과, 개인의 적극적 성향은 LMX와 긍정적 직무수행에 정(+)의 관계, 부정적 직무수행에 부(-)의 관계를 나타냈다. LMX 역시 긍정적 직무수행와 정(+)의 관계, 부정적 직무수행와 부(-)의 관계를 나타냈다. LMX는 적극적 성향과 긍정적 직무수행 관계에서 정(+)의 매개효과, 적극적 성향과 부정적 직무수행 관계에서는 부(-)의 매개효과를 보였다. 적극적 성향이 직무수행에 미치는 영향이 통계적으로 유의미함을 확인하여 공무원 선발시 적극적 성향을 파악할 수 있는 평가방식, 개인의 성향에 맞는 교육·훈련 등의 관리방안 마련과 적절한 LMX 구축의 필요성을 제시하였다. This study aims to investigate empirically whether proactive public officials" job performance is actually better in a situation where "proactive public service" is emphasized. The association between public officials" proactivity and individual job performance was investigated using a structural equation model with the leader-member exchange (LMX) as a mediator. As a result of the measurement model analysis, positive job performance was appropriately conceptualized as task performance, OCBI, and OCBO. Negative job performance was appropriately conceptualized as counterproductive work behavior (CWB). The results of the structural model analysis showed that (1) the proactivity of public officials is positively related to LMX and positive job performance and negatively related to negative job performance. (2) LMX is positively related to positive job performance and negatively related to negative job performance. (3) LMX showed a positive mediating effect in the relationship between proactivity and positive job performance, and a negative mediating effect in the relationship between proactivity and negative job performance. Based on the findings, we emphasized the importance of designing a system that can identify an applicant"s proactive disposition in the recruitment and selection process for public officials, preparing management plans such as education and training suitable for individual disposition, and establishing an appropriate LMX.