O₂/ Ar 플라즈마 처리에 의해 개질된 폴리카보네이트 기판에서 Cu의 밀착성

박준규,김동원,김상호,이연승,Park, Jun-Kyu,Kim, Dong-Won,Kim, Sang-Ho,Lee, Youn-Seoung 한국재료학회 2002 한국재료학회지 Vol.12 No.9

In this study, the polycarbonate surface was treated by $O_2$/ Ar gases plasma for the enhancement of adhesion with Cu electrode. From the point of view of hydrophilicity and the functionality, the micro-roughness, new functional groups and oxygen content of the polycarbonate surface were increased by the $O_2$/ Ar gases plasma treatment. The Cu films deposited on the as-received polycarbonate were easily detached while, after the$ O_2$/ Ar gases plasma treatment the adhesive Cu films on polycarbonate could be obtained. These results can be explained that the polycarbonate had a hydrophilic surface with uniform micro-roughness and new functional groups by $O_2$/ Ar gases plasma treatment. Therefore,$O_2$/ Ar gases plasma treatment is a promising method for improvement of adhesion between polycarbonate and Cu electrode.

리튬 이차전지 양극재 Li_xV₂O₅의 효율적인 방전을 위한 구조 설계

박준규,김수일,김동철,Park, Jun Kyu,Kim, Soo Il,Kim, Dongchoul 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.7

전기자동차와 하이브리드 자동차의 상용화에 따라 전기용량과 에너지 밀도가 향상된 리튬 이온 전지의 개발이 필요하다. 본 논문에서는 상장 모델을 이용하여 5산화 바나듐으로 구성된 다공성 구조물로의 리튬 이온 삽입현상을 분석하였다. 다공성 5산화 바나듐 구조물은 구멍을 갖는 구체의 구조물로 정의하였으며, 이때 구멍의 형상은 원통형이다. 원통형 구멍의 반지름, 깊이 및 개수를 조절하여 다양한 다공성 5산화 바나듐의 미세조직 형상을 고려하였으며, 각 미세조직의 형상인자와 구조물에 삽입되는 리튬 이온의 개수 사이의 관계를 분석하였다. 마지막으로 최적화 작업을 통하여 가장 많은 수의 리튬 이온이 삽입될 수 있는 다공성 5산화 바나듐의 구조체 형상을 찾아내었다. Recently, higher capacity and energy density of lithium ion batteries are increasingly demanded for enhancing their performance in view of the rise in the commercial distribution of electric and hybrid vehicles. Computational analysis of a porous structure of vanadium pentoxide cathode was performed, employing a phase field model. The incipient model was designed as a spherical structure with cylindrical-shaped pores. Modifying the diameters and lengths of the pore cylinder and the number of pores, we considered different conditions for the porous vanadium pentoxide cathodes for analyzing their effect on the amount of lithium ion intercalated to them. Subsequently, we optimized the porous structure to contain the largest amount of intercalated lithium ion during discharge.

Effect of Long-Term Application of Ammonium Sulfate, Urea, Composts, and Calcium Silicate on Macroelements and Rice Yields in Paddy Soil

박준규,오왕근,김원출,Park, Jun-Kyu,Oh, Wang-Keun,Kim, Weon-Chul 한국토양비료학회 1990 한국토양비료학회지 Vol.23 No.4

논 토양(土壤)에 황산(黃酸)암모늄, 요소(尿素), 퇴비(堆肥) 및 규산질비료(珪酸質肥料)의 장기연용(長期連用)이 주요(主要) 토양양분(土壤養分)의 행동(行動)과 벼의 수량(收量)에 미치는 영향에 대한 시험결과(試驗結果)를 요약(要約)하면 다음과 같다. 1. 토양(土壤)의 pH는 요소단용(尿素單用)에 비하여 황산(黃酸)암모늄 단용(單用)이 시험실시년한(試驗實施年限)이 경과(經過)함에 따라 더욱 낮아졌으며 요소(尿素) 및 황산(黃酸)암모늄에 퇴비(堆肥), 규산질(珪酸質) 비료병용(肥料倂用)은 요소(尿素), 황산(黃酸)암모늄단용(單用)보다 pH가 현저히 높은 경향을 보였다. 2. 토양유기물함량(土壤有機物含量)은 황산(黃酸)암모늄, 요소단용(尿素單用) 및 3요소구(要素區)보다 여기에 퇴비(堆肥) 및 규산질비료병용(珪酸質肥料倂用)이 현저히 증가(增加)하였다. 3. 토양중(土壤中)의 N, $P_2O_5$, Ca, Mg, $SiO_2$함량(含量)은 3요소(要素)에 비하여 3요소(要素)에 퇴비병용토양(堆肥倂用土壤)에서 현저히 증가(增加)하였으나 K는 오히려 낮은 경향을 보였는데 이는 벼의 생육증가(生育增加)로 K의 흡수량(吸收量) 증가(增加)와 퇴비시용(堆肥施用)으로 인한 토양(土壤)의 투수성(透水性) 개량(改良)으로 K의 용탈(溶脫)을 촉진(促進)시킨 것으로 본다. 4. 황산(黃酸)암모늄과 퇴비(堆肥) 및 규산질비료병용(珪酸質肥料倂用)에 비하여 요소(尿素)와 퇴비(堆肥) 및 규산질비료병용토양(珪酸質肥料倂用土壤)에서 치환성(置換性) Ca, Mg의 증가(增加)는 황산(黃酸)암모늄 시용(施用)이 $CaSO_4$ 또는 $MgSO_4$로 용탈(溶脫)을 촉진(促進)시킨 것으로 본다. 5. 토양(土壤)중(中) 질소(窒素)의 함량(含量)은 퇴비시용(堆肥施用)으로 증가(增加)되나 규산질비료(珪酸質肥料)의 병용(倂用)은 질소(窒素)의 함량(含量)을 현저히 감소(減少)시켰다. 이는 규산질비료병용(珪酸質肥料倂用)으로 토양질소(土壤窒素)의 무기화(無機化)를 촉진(促進)시킨 결과(結果)라고 생각된다. 6. 벼의 수량(收量)은 황산(黃酸)암모늄 및 요소단용시(尿素單用時)에는 수량(收量)의 차이를 보이지 않았으나 퇴비(堆肥), 규산질비료(珪酸質肥料) 병용시(倂用時)에는 황산(黃酸)암모늄에서 증수(增收)경향을 보였는데 이는 황산(黃酸)암모늄의 부성분(副成分)인 황(黃)의 효과라고 본다. A study has been conducted since 1954 to elucidate the effects of longterm application of ammonium sulfate (AS), urea, compost, and calcium silicate(CS) fertilizers on major soil nutrients and rice yields in wetland soil. The soil pH in the AS plot become lower than that in the urea plot but had little influence on rice yield. Continuous application of AS and urea with compost and CS raised the soil pH compared with single applications of AS or urea. Soil organic matter content increased yearly in plot with no fertilizer and in those with AS and urea, and increased considerably in plots with compost and CS. Application of compost and CS promoted rice top growth as well as root growth, resulting in increased dry matter. Soil contents of N, $P_2O_5$, Ca, Mg, and $SiO_2$ in the NPK with composts plot increased considerably compared with the NPK plot; however. the exchangeable K content was rather low. Rice growth increased with compost application. which enhanced K uptake, and the coarse texture promoted K leaching. With compost and CS addition, con tents of exchangeable Ca and Mg in the AS plot decreased considerably more than in the urea plot. Probably this was the result of higher Ca and Mg precipitation by sulfate in the AS plot. The re are no significant differences in rice yield between AS and urea plots. With compost and CS treatments, rice yields increased in the AS plot compared with the urea plot. The increase in yield is considered to be the effect of S. which is a constituent of AS.

개념설계 단계의 잠수함 작전효과도 시뮬레이션 모델 연구

박준규,Park Jun-Kyu 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.3

This paper focuses on the technical information about the development of the submarine operational effectiveness simulation model for the feasibility study stage of the submarine design. The simulation model is classified into simulation control model and system model. Using user input and related performance parameters, it can simulate various scenarios by no change of the program because it includes tactic manager which makes decision about every situation. And the Monte-Carlo simulation mode which provides the stochastic results is available. Through the test simulation, the usefulness of the simulation model was verified. It should be helpful for the analysis of the submarine operational effectiveness by diversified scenarios in the concept design phase..

MEC 반응조 Scale-up을 위한 내부저항의 최소화

박준규 ( Jun Kyu Park ),전항배 ( Hang Bae Jun ) 충북대학교 산업과학기술연구소 2015 산업과학기술연구 논문집 Vol.29 No.2

A microbial electrolysis cell (MEC) as a modified microbial fuel cell (MFC) is a promising technology for the degradation of high concentration organic matter and biogas production. At current stage, the most likely limiting factors for successful scale up of this technology are the large internal resistances consisted electrolyte, charge and mass transfer resistance, representatively. For minimize of internal resistances, proton diffusion rate between anodic and cathodic electrodes should be a maximization. However, because of the mechanisms of internal resistances effect on total energy efficiency were not investigated, technique level of MEC for scale-up is low. Therefore, in this review paper, we studied various internal resistances in MEC and efforts for minimize of internal resistances at other studies. Moreover, we evaluated of current technique level of resistance in MEC and suggested about way ahead of research direction for minimize internal resistance for MEC scale-up.

2축 머니퓰레이터를 이용한 경로기반 동작제어 기법의 성능 평가에 대한 연구

박준규(Jun-Kyu Park),전중현(Jung-Hyeon Jeon),현창호(Chang-Ho Hyun) 한국지능시스템학회 2015 한국지능시스템학회 학술발표 논문집 Vol.25 No.1

다요인 이자율 기간구조 모형의 SMM 추정을 통한 실증 분석

박준규 ( Jun-kyu Park ),김배호 ( Baeho Kim ),강대일 ( Daeil Kang ) 한국금융연구원 2018 금융연구 Vol.32 No.2

본고는 연금기금 등에서 필요한 자산부채 종합관리(Asset Liability Management, ALM)를 위한 이자율 기간구조 모형에 대해 고찰한다. 기존의 국내 이자율 관련 연구가 주로 단기 동태성 추정에 한정되어 왔으나, 종합적인 ALM를 위해서는 중장기적 관점의 분석이 필요하다는 점에서 무차익조건 및 균형 이자율 등의 이론적 평형 조건을 기반으로 한 다요인 이자율 기간구조 모형을 개발하여 이를 추정하는 모듈을 구현하고, 결과를 통계적인 방식으로 검증하였다. 본 연구에서 사용된 이자율 기간구조 모형은 국내 채권 자료를 이용하여 거래되는 모든 만기의 이자율 기간구조 자료를 기반으로 기존의 Black and Karasinski(1991) 모형을 확장한 형태로, 모형의 유연성을 확보한 대신, 무차익 채권 가격의 닫힌 해가 더 이상 존재하지 않아 모수 추정을 위해 SMM (Simulated Method of Moments) 기법을 적용하였다. 특히, 본 연구에서 새롭게 제안한 일반화된 형태의 Black and Karasinski(1991) 2요인 모형은 추정된 모수를 이용하여 쉽고 직관적으로 이자율 기간구조의 동태적인 움직임에 대한 시나리오를 시계열 측면과 횡단면 측면에 대해 일관성 있게 생성할 수 있다는 커다란 장점이 있다. 실증 분석 결과, 추정된 모형이 중장기적으로도 높은 통계적인 적합도를 보여 중장기 영역까지 고려한 ALM 분석에 더욱 적절하게 사용될 수 있음을 확인하였다. Term structure of interest rates, also known as yield curve, shows the market-driven trend of risk-free bond yields across different time-to-maturities. Its shape contains crucial information towards mid- and long-term asset allocation strategies as well as their ex-post performance evaluation. The selected term structure model is the main toolkit in terms of the asset liability managements (ALM) of financial institutions and funds along with their market, credit, and operational risk management standard. In line with the introduction of Solvency Ⅱ, global financial institutions are supposed to be equipped with a more sophisticated ALM system based on reliable interest rate models. In Korea, unfortunately, little attention has been paid to the related research topics on the mid- and long-term ALM analysis with domestic bond market data. The practical interest rate models employed in domestic financial industry tend to focus on the statistical goodness-of-fit to the short-term market data, even if there is no guarantee that the same model is suitable for a long-term ALM strategy. More importantly, many of those myopic models generally fail to satisfy the requirements suggested by Ziemba and Mulvey (2004): theoretical balance conditions such as the economic equilibrium within the arbitrage-free constraint, the reality of the shape of model-implied term structure, and its integration capacity with sufficient explanatory power of historical data and the exogenous economic anecdotes. For example, the Nelson-Siegel (1994) one-factor model is a widely-used statistical model, which neglects the theoretical balance conditions. It is also known to be difficult to construct sufficiently flexible shapes of term structures; thereby the ensuing scenarios implied by the theoretically unfounded single-factor model become less realistic in that they are limited in reflecting economic intuitions from the ad-hoc numerical approximation without careful economic justification. Therefore, a multi-factor term structure model is suitable for satisfying the conditions to capture market-wide environments as long as one can verify the procedure of its estimation methods. This paper proposes a theoretically motivated multi-factor model for ALM analysis across various risk horizons to illustrate the time-series behavior of term structures extracted from the domestic bond market data. Our proposed term structure model respects theoretical requirements as a basis of simulation-based analysis with statistical accuracy. For this purpose, we adopt the Black and Karasinski (1991) model as a primitive of our multi-factor interest rate model. Specifically, we extend the Black & Karasinski (1991) model as a two-factor model with the square-root stochastic volatility process instead of a constant long-term mean parameter. We further propose the simulated method of moments (SMM) to estimate the model-based term structure by fitting the two-factor model to the real bond market data. Our extended Black and Karasinski (1991) two-factor model contributes to the related literature in many aspects. We estimated our proposed model by SMM using Monte-carlo simulations with domestic interest data. Our findings confirm that the newly proposed model is more appropriate for the ALM analysis across different risk horizons. The generalized form of the extended Black & Karasinski (1991) two-factor model can intuitively generate realistic scenarios of the dynamics in the shape of term structures implied by the calibrated parameters in a consistent manner. Our methodology is applicable to the estimation of more advanced but complicated models. For instance, Johannes (2004) and Das (2001) finds that including a jump-risk factor is necessary to represent the fat-tailed distribution of interest rate movements in the U.S. bond market. In fact, the empirical observation exhibits substantial evidence in favor of jump-risk component in the form of regime-changing policy decisions or systemic shocks. We suggest our future research topics in this direction.

선형 강도 교정을 이용한 라만 스펙트럼 인식

박준규(Jun-Kyu Park),백성준(Sung-June Baek),박아론(Aaron Park) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.3

라만 스펙트럼은 측정 장비 및 환경 조건에 따라 동일한 물질이라도 스펙트럼의 강도 차이를 보인다. 이는 라만분광의 패턴 인식적인 접근에 제약을 주기 때문에 장비간의 호환성 및 라만 데이터베이스의 재사용을 위해 반드시 해결해야 하는 문제다. 이를 위해 이전의 주요 연구들에서는 측정 장비 간에 전달 함수를 가정하고 이를 구한 후 직접적인 스펙트럼의 교정을 수행하였다. 하지만 이 방식은 강도 왜곡을 발생시키는 다른 조건들에 대해서는 대처 할 수 없는 방법이다. 따라서 본 논문에서는 다양한 측정 조건에 보다 유연하게 대응 할 수 있는 선형 강도 교정을 이용한 분류 방법을 제안하였다. 제안한 방법의 성능 평가를 위해 실험에서는 14033종의 화학 물질에서 측정된 라만 라이브러리를 실험물질에 대한 판별 지표로 사용하였으며, 3개의 라만 분광기로부터 측정된 10종의 화학 물질 라만 스펙트럼을 실험 데이터로 사용하였다. 실험결과에 따르면 제안한 방법을 사용하였을 때 강도 왜곡된 스펙트럼에 대해 100%의 판별 성능을 보였으며, 판별된 스펙트럼에 대해서도 이전보다 높은 상관점수를 보여 사용자가 화학 물질을 판별하는 데 유용한 도구로 사용될 수 있음을 확인하였다. Raman spectra exhibit differences in intensity depending on the measuring equipment and environmental conditions even for the same material. This restricts the pattern recognition approach of Raman spectroscopy and is an issue that must be solved for the sake of its practical application, so as to enable the reusability of the Raman database and interoperability between Raman devices. To this end, previous studies assumed the existence of a transfer function between the measurement devices to obtain a direct spectral correction. However, this method cannot cope with other conditions that cause various intensity distortions. Therefore, we propose a classification method using linear intensity calibration which can deal with various measurement conditions more flexibly. In order to evaluate the performance of the proposed method, a Raman library containing 14033 chemical substances was used for identification. Ten kinds of chemical Raman spectra measured using three different Raman spectroscopes were used as the experimental data. The experimental results show that the proposed method achieves 100% discrimination performance against the intensity-distorted spectra and shows a high correlation score for the identified material, thus making it a useful tool for the identification of chemical substances.

Effect of Long-Term Application of Ammonium Sulfate, Urea, Composts, and Calcium Silicate on Macroelements and Rice Yields in Paddy Soil

Jun-Kyu Park(朴俊奎),Wang-Keun Oh(吳王根),Weon-Chul Kim(金元出) 한국토양비료학회 1990 한국토양비료학회지 Vol.23 No.4

유연탄 비산회를 활용한 흡착제의 제조 및 특성

박준규 ( Park Jun Kyu ),주소영 ( Ju So Young ),이민희 ( Lee Min Hee ),연익준 ( Yeon Ik Jun ),김광렬 ( Kim Kwang Yul ) 한국환경기술학회 2003 한국환경기술학회지 Vol.4 No.2