리튬 유황전지용 폴리우레탄 고분자 전해질의 전기화학적 특성

김형주,신준호,김종화,김기원,안효준,안주현,Kim, Hyeong-Ju,Shin, Joon-Ho,Kim, Jong-Hwa,Kim, Ki-Won,Ann, Hyo-Jun,Ahn, Ju-Hyun 한국전기화학회 2002 한국전기화학회지 Vol.5 No.2

본 연구에서는 높은 인장강도와 탄성력을 가지는 다공성 폴리우레탄(polyurethane, PU)을 지지체(matrix)로 이용하고, 유기 전해액 ethylene carbonate(EC), propylene carbonate(PC), tetraethylene glycol dimethylether(TG)와 1M $LiCF_3SO_3$를 부피비 1:1 비율로 혼합하여 액체 전해액을 제조하였으며, 높은 이론용량을 가지는 Li/S전지에 적용하여 전기 화학적 특성을 조사하였다. 1M $LiCF_3SO_3$에 TG를 첨가할 경우 유기 전해액의 함침량이 약 $750\%$ 증가하였으며 방전용량$(1065mAh/g{\cdot}sulfur)$ 및 사이클 특성이 가장 우수하였다. 1M $LiCF_3SO_3$에 TG/EC(v/v,1:1) 및 PC/EC(v/v,1:1)를 첨가한 경우 이온 전도도는 각각 $3.15\times10^{-3}(S/cm)$ 와 $3.18\times10^{-3}(S/cm)$로 나타났다. Polyurethane was used as matrix for polymer electrolytes with liquid electrolyte consist of organic solvent as ethylene carbonate(EC), propylene carbonate(PC), and tetraethylene glycol dimethylether(TG) and 1M $LiCF_3SO_3$, which has high mechanical strength and porosity. Electrochemical properties fur polyurethane electrolytes with various liquid electrolytes were evaluated. The amount of immersed liquid electrolyte for TG with 1M $LiCF_3SO_3$ was increased to about $750\%$ by weight, and initial discharge capacity and cycle performance was better than others. Ionic conductivity for TG/EC(v/v,1:1) and PC/EC(v/v, 1:1) with 1M $LiCF_3SO_3$ was about $3.15\times10^{-3} S/cm, \;3.18\times10^{-3}S/cm$

객체지향 데이터베이스의 동향과 전망

김형주,Kim, Hyeong-Ju 한국데이터베이스진흥원 1993 디지털콘텐츠 Vol.9 No.-

고성능 침입탐지 및 대응 시스템의 구현 및 성능 평가

김형주,박대철,Kim, Hyeong-Ju,Park, Dae-Chul 한국정보처리학회 2004 정보처리학회논문지 C : 정보통신,정보보안 Vol.11 No.2

최근 정보통신기반이 급속히 발달하고 사용자가 늘어남에 여러가지 사이버 공격이 늘어나고 있다. 침해사고를 예방하고 효과적인 대응방법이 마련된 침입탐지시스템들은 저속 환경에서의 실시간 분석에 적합하도록 설계되고 구현되었기 때문에, 증가하는 트래픽 양을 처리하는데 어려움이 있다. 또한, 기가비트 이더넷(Gigabit Ethernet) 환경과 같은 고속 네트워크 환경이 현실화되므로 대용량의 데이터를 처리할 수 있는 효과적인 보안 분석 기법들이 필요하다. 본 논문에서는 고속 네트워크 환경에 필요한 침입탐지 및 그 대응 방법에 위한 고속 침입탐지 메커니즘 적용 시스템을 제안한다 이는 패킷 헤더 기반의 패턴 매칭 기능과 시스템 커널 영역에서 수행되는 패킷 데이터 기반의 패턴 매칭 기능을 통해서, 고속 네트워크 환경에 적합한 침입탐지 메커니즘을 제안하며, 시스템의 성능을 기존 운용 시스템과 비교 분석함으로써, 제안한 침입탐지 메커니즘이 트래픽 처리성능면에서 최대 20배까지 우수했다. Recently, the growth of information infrastructure is getting fatter and faster. At the same time, the security accidents are increasing together. We have problem that do not handle traffic because we have the Intrusion Detection Systems in low speed environment. In order to overcome this, we need effective security analysis techniques that ran Processed data of high-capacity because high speed network environment. In this paper we proposed the Gigabit Intrusion Detection System for coordinated security function such as intrusion detection, response on the high speed network. We suggested the detection mechanism in high speed network environment that have pattern matching function based packet header and based packet data that is proceeded in system kernel area, we are shown that this mechanism was excellent until maximum 20 times than existing system in traffic processing performance.

상류 후류의 익렬 유동에 미치는 영향에 대한 실험적 연구

김형주,조강래,주원구,Kim, Hyeong-Ju,Jo, Gang-Rae,Ju, Won-Gu 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.3

This paper is concerned with the effect of cylinder wakes upstream on blade characteristics of compressor cascade(NCA 65 series). At first, it is found that the velocity defect ratio of cylinder wake varies according to the acceleration and deceleration in a flow field but, is conserved nearly constant at flow downstream the cascade, irrespective of the flow path in the cascade. When a cylinder wake flows along near the suction surface of the blade, or impinges on the leading edge, the turbulent velocities are supplied on or inside the outer edge of boundary layer near the leading edge of suction surface, and the transition to a transitional or turbulent boundary layers is induced, so that the laminar separation is prevented, but the profile loss increases. The transition of boundary layer to a transitional or turbulent one is strongly related with the strength of added turbulent velocities near the leading edge on the suction surface, which is influenced by the flow path of a cylinder wake.

과학ㆍ기술ㆍ사회 - 21세기의 과학기술, 경제논리 경계해야

김형주,Kim, Hyeong-Ju 한국과학기술단체총연합회 1999 과학과 기술 Vol.32 No.12

21세기는 과학혁명이 일어날 것이라고 과학자들은 말하고 있다. 고도로 발달된 과학기술과 그 기술에 의해 빚어진 새로운 생활모습이 나타날 것이다. 그런데 과학기술은 양날의 칼과 같아서 적절히 사용하면 우리 삶을 윤택하게 해주지만 이기적인 욕망에 칼자루를 맡기면 오히려 인류 멸망의 불씨를 제공할 수도 있다. 과학기술이 인류를 위해 쓰여지도록 하기 위해선 그 기술의 경제적 이익과 사회적 비용을 적정하게 가름할 수 있는 윤리의식 확보가 선행되어야 할 것이다.

UV Light Induced Photocatalytic Degradation of Cyanides in Aqueous Solution over Modified $TiO_2$

김형주,김재현,이청학,현택환,최원용,이호인,Kim, Hyeong Ju,Kim, Jae Hyeon,Lee, Cheong Hak,Hyeon, Taek Hwan,Choe, Won Yong,Lee, Ho In Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.12

Metal doping was adopted to modify TiO2 (P-25) and enhance the photocatalytic degradation of harmful cyanides in aqueous solution. Ni, Cu, Co, and Ag doped TiO2 were found to be active photocatalysts for UV light induced degradation of aqueous cyanides generating cyanate, nitrate and ammonia as main nitrogen-containing products. The photoactivity of Ni doped TiO2 was greatly affected by the state of Ni, that is, the crystal size and the degree of reduction of Ni. The modification effects of some mixed oxides, that is, Ni-Cu/TiO2 were also studied. The activity of Ni-Cu/TiO2 for any ratio of Cu/Ni was higher than that of Ni- or Cu-doped TiO2, and the catalyst at the Cu/Ni ratio of 0.3 showed the highest activity for cyanide conversion.

복부 자상 환자에서 즉각적 개복술을 위한 적응증

김형주 ( Hyeong Ju Kim ),황성연 ( Seong Youn Hwang ),최영철 ( Young Cheol Choi ) 대한외상학회 2007 大韓外傷學會誌 Vol.20 No.2

Purpose: There is little controversy that a classic indication such as hemodynamic instability or any sign of peritoneal irritation requires an immediate laparotomy in the management of abdominal stab wounds. However, omental herniation or bowel evisceration as an indication for an immediate laparotomy is controversial. The purpose of this study was to evaluate the significance of these factors as indications for an immediate laparotomy. Methods: The medical records of 98 consecutive abdominal stab wounds patients admitted to the Emergency Center of Masan Samsung Hospital from January 2000 to December 2006 were carefully examined retrospectively. Using multivariate logistic regression analysis, thirty-nine factors, including the classic indication and intraabdominal organ evisceration, were evaluated and were found to be associated with a need for a laparotomy. Also, the classic indication was compared with a new indication consisting of components of the classic indication and intra-abdominal organ evisceration by constructing a contingency table according to the need for a laparotomy. Results: Multivariate logistic regression analysis revealed any sign of peritoneal irritation, base deficit, and age to be significant factors associated with the need for a laparotomy (p<0.05). The sensitivity, specificity, and accuracy rates of the classic indication were 98.6%, 72.0%, and 91.8%, respectively, and those of the new indication were 93.2%, 84.0%, and 90.8%, respectively. The differences in those rates between the above two indications were not significant. Conclusion: Intra-abdominal organ evisceration was not a significant factor for an immediate laparotomy. Moreover, the new indication including intra-abdominal organ evisceration was not superior to the classic indication. Therefore, in the management of abdominal stab wounds, the authors suggest that an immediate laparotomy should be performed on patients with hemodynamic instability or with any sign of peritoneal irritation. (J Korean Soc Traumatol 2007;20:106-114)

RIE 공정으로 제조된 블랙 실리콘층을 이용한 SERS 기판용 3차원 금속 나노구조의 제조

김형주(Hyeong-Ju Kim),이동인(Dongin Lee),김봉환(Bonghwan Kim),조찬섭(Chanseob Cho) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8

농학계열 대학 학과 및 학문 간 거리: 취업분야를 중심으로

김형주(Hyeong Ju Kim),김정태(Jung Tae Kim) 교육종합연구원 2023 교육종합연구 Vol.21 No.2

본 연구는 농학계열 대학들이 농학의 정체성 유지를 위한 통섭과 학제 간의 협력 연구분야를 발굴한다는 측면에서 학과 간 융복합 가능성을 살피고자 하였다. 이에 따라, 학과 간 협력의 가능성을 취업분야의 공유정도로 설정하고 농학계열 학과 간, 학문 간의 거리를 측정하였다. 분석에 활용한 자료는 (사)전국농학계대학장협의회(ADACU)와 농림수산식품교육문화정보원(EPIS)이 전국 농학계열 대학을 대상으로 취업률을 조사한 2014년 자료이다. 본 연구는 해당 자료에서 선별과정을 거쳐 전국 81개 학과를 선정하고 이를 분석대상으로 하였다. 분석방법은 Ward 군집분석을 이용하였고, 최적 군집수 선택은 Monte Carlo 시뮬레이션을 이용하였다. 분석결과, 농업환경생태 ‧ 농수축산물 위생 및 품질관리 ‧ 식품영향과학 간, 농업기계학 ‧ 농업토목학 ‧ 조경학 간 취업분야 관계에서 직접 또는 간접 분야별로 비교적 빠르게 군집을 형성하고 있고 이 외에도 학문별 취업처를 공유하는 인접 학문 분야가 다수 존재함을 확인하였다. 이를 통해 볼 때, 공동교육과정 운영과 분야별 융합연구 가능성이 있는 세부 영역을 설정해 볼 수 있었으나, 그 정도는 농학계열 대학에서 벗어나 다른 단과대학으로 분리될 수준은 아닌 것으로 나타났다. 그러나 식품과학과 농업기계 분야는 다른 학과들에 비해 공유되는 취업부문 수준이 낮아 취업과 연계된 공동교육과정 운영 등에 어려움이 있을 것으로 보인다. 따라서, 현재 농산업분야에서 요구되고 있는 전문적, 기술적 영역에 대해 일정부분 공통된 방향성을 가지고 있는 인접 학과 및 학문 간에는 통합과 조정, 융복합이 우선적으로 필요할 것이다. 이를 위해서 농학계열 대학은 변화되어가는 사회 및 경제, 산업 등의 환경에 대한 명확한 현실 판단과 예측, 선제적 대응을 위한 노력이 필요할 것이며, 학계는 연구를 비롯한 다양한 논의를 통해 이를 뒷받침해 줄 수 있어야 할 것이다. This study examined the possibility of convergence between departments in terms of consilience for maintaining the identity of agricultural science and discovering cooperative research areas between disciplines at agricultural universities. Accordingly, the possibility of cooperation between departments was set as the degree of sharing in the field of employment, and measures the distance between disciplines in agriculture colleges. The data used for the analysis were the data of the National Association Deans of Agricultural College and University and the EPIS(Korea Agency of Education, Promotion and Information Service in Food, Agriculture, Forestry and Fishery) surveying the employment rate of agricultural universities nationwide in 2014. After the data selection process, 81 departments from Agricultural universities nationwide were used to analyze. Ward cluster analysis was used for the analysis method, and Monte Carlo simulation was used to select the optimal number of clusters. As a result of the analysis, clusters are formed relatively quickly directly or indirectly in the relationship between agricultural environment ecology, hygiene and quality control of agricultural and livestock products, food impact science, and agricultural machinery, agricultural civil engineering, and landscaping. It was confirmed that there are many academic fields. When looking through this, although it was possible to set up detailed areas with the possibility of operating a joint curriculum and convergence research by field, it was found that the degree was not at the level of being separated into other colleges away from agricultural universities. However, compared to other departments, the food science and agricultural machinery fields have a low level of shared employment, so it seems that there will be difficulties in operating joint education courses related to employment. Therefore, basic departments and the elderly, who have a certain partially cultivated direction for the professional and consequently required by the current agricultural industry, need integration, adjustment, and military complex first. To this end, agricultural colleges will need to make efforts to make clear reality judgments, predictions, and preemptive responses to the changing social, economic, and industrial environments, and the academic world should be able to support them through various discussions, including research. something to do.

사내대학의 발생과정과 대학평가 체제에서의 의의

김형주 ( Kim Hyeong Ju ) 안암교육학회 1999 한국교육학연구 Vol.5 No.1