미생물을 이용한 대마의 리그닌과 펙틴 분해

김형주,권길광,서규원,김민철,김형섭,고준석,Kim, Hyung-Joo,Kwon, Kil-Koang,Seo, Kyu-Won,Kim, Min-Chul,Kim, Hyung-Sup,Koh, Joon-Seok 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.6

In this study, microbial degradation of lignin and pectin in raw hemp was investigated. Using lignin and pectin containing media, various microorganisms were isolated from soil and fecal samples of ruminant. The isolates were identified using the 16s rRNA method. The isolated strains were Klebsiella sp., E. coli, Aspergillus fumigatus, and Burkholderia sp. For the degradation of hemp, a pre-cultured isolate was inoculated (5% v/v) into the medium containing raw hemp (as a sole carbon source: 1% w/v) and nitrogen sources and the mixture was incubate aerobically for 168 hours in a shaking incubator (200 rev $min^{-1}$) at $30^{\circ}C$. The hemp biodegradation activity of the identified microorganism was measured by FT-IR. The FT-IR results showed that the Klebsiella sp. has the highest lignin and pectin degradation activity. These results show that the isolates and the reaction conditions could be applied to the conventional hemp fiber refinery processes.

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 $3.15\times10^{-3} S/cm, \;3.18\times10^{-3}S/cm$

특성도를 이용한 결측치 대체방법

김형주,김동재,Kim, Hyungju,Kim, Dongjae 한국통계학회 2017 응용통계연구 Vol.30 No.3

임상시험에서 어떻게 결측치를 다룰 것인가 하는 것은 큰 문제이다. 주로 주분석에서 사용하는 ITT원칙은 결측치가 어떠한 메커니즘을 따른다는 가정 하에 결측치를 대체 하지만 가정에 대한 타당성이 불확실한 문제가 있다. 즉, 올바른 결측치 대체방법은 매우 중요하다. 본 연구에서는 Kang과 Kim (1997)이 제안한 일치도와 유지도의 개념을 이용하여 새로운 결측치 대체방법을 제안하였다. 또한 실제자료를 이용하여 예제를 제시하고 Monte Carlo 모의실험을 통하여 기존방법과 대체 성능을 비교하였다. How to handle missing data is a main issue in clinical trials. We impute missing data based on missing data that follows a mechanism according to the intention-to-treat rule. However, using the right imputation method for missing data is very important because this supposition is unclear. We suggest a new imputation method for missing data using agreement and maintenance introduced by Kang and Kim (1997). We give an example and adapt a Monte Carlo simulation to compare the performance between the established method and the suggested method.

DSRC 자료를 이용한 고속도로 단기 통행시간 예측

김형주,장기태,Kim, Hyungjoo,Jang, Kitae 대한토목학회 2013 대한토목학회논문집 Vol.33 No.6

현재까지 통행시간 예측과 관련된 다양한 연구들이 수행되었지만, 한국고속도로 특성에 맞는 예측방법론에 대한 실증연구는 부족한 실정이다. 이에 본 연구에서는 실제 통행시간을 기반으로한 DSRC 자료를 바탕으로 한국고속도로에 적절한 예측방법론을 도출한다. 경부고속도로 안성 JC~오산IC 구간의 24시간 DSRC 자료를 이용하며 단주기 통행시간 예측 및 비선형 관계에서 높은 정확도를 보이는 인공신경망 기법을 적용한다. 이어서 랜덤난수를 이용한 통행시간 예측결과의 정확도 검증을 실시한다. 통행시간 예측결과 오차율이 약 4%로 우수한 예측력을 보였으며, 이는 패턴기반 인공신경망 예측시 이력자료의 전처리 과정과 최적의 입력층 및 은닉층의 선정으로 인한 결과로 판단된다. 통행시간 예측결과의 검증을 위해서 랜덤난수를 이용하였으며, 랜덤난수가 이력자료 패턴에 포함되지 않은 경우 실측치와의 오차율이 18.98%로 높게 도출되었다. 이는 인공신경망을 이용한 통행시간 예측시 패턴DB가 예측의 정확도에 주요하게 작용한 결과로 판단된다. 본 연구의 결과를 통해서 한국고속도로 특성에 맞는 통행시간 예측 및 정보제공이 가능할 것으로 판단된다. This paper develops a travel time prediction algorithm that can be used for real-time application. The algorithm searches for the most similar pattern in historical travel time database as soon as a series of real-time data become available. Artificial neural network approach is then taken to forecast travel time in the near future. To examine the performance of this algorithm, travel time data from Gyungbu Highway were obtained and the algorithm is applied. The evaluation shows that the algorithm could predict travel time within 4% error range if comparable patterns are available in the historical travel time database. This paper documents the detailed algorithm and validation procedure, thereby furnishing a key to generating future travel time information.

신.재생에너지 발전설비의 원격 데이터 수집을 위한 통합 보안 관리시스템에 관한 연구

김형주,임중열,Kim, Hyoung-Ju,Lim, Jung-Yol 한국전기전자학회 2009 전기전자학회논문지 Vol.13 No.2

산업화가 가속되고 정보 가전기기의 사용이 급증함에 따라 열악한 국내 에너지 현실에서 신 재생 에너지의 개발과 보급은 절실히 요구되고 있다. 따라서 본 논문에서는 신 재생에너지의 적극적인 보급과 활용을 위하여, 분산 배치된 신 재생에너지 발전설비의 발전 데이터를 효율적으로 관리할 수 있는 통합 관리 운영시스템을 제안하였다. 또한 컴퓨터 바이러스. 스파이웨어와 다른 네트워크 문제로 인해 수집된 데이터의 유실을 방지하기 위해 통합 보완 관리 시스템을 적용하여 발전 데이터를 보호하도록 구성하였다. Development and diffusion of a new and renewable energy are acutely required at domestic energy actualities to be inferior as industrialization is accelerated, and use of information electric appliance is increased rapidly. For the diessemination and practical use of new and renewable energy, this paper presents an unified security management system that is efficiently able to acquire operational status date and control distributed generation facilities. Also, the unified security management system is suggested to protect gathered operational status date from unpredictable problems such as computer virus, spy ware, and any other network problems.

기록관리 시스템 기능요건 표준의 정부산하공공기관 적용에 관한 사례 연구

김형주,김수현,Kim, Hyung-Joo,Kim, Soo-Heon 한국비블리아학회 2017 한국비블리아학회지 Vol.28 No.2

정부산하공공기관은 경영 자주성, 업무 전문성을 고려하여 기록물을 자체적으로 보존 관리할 것을 원칙으로 하고 있다. 정부산하공공기관을 위한 범용 기록관리시스템이 없는 상황에서 "정부산하공공기관 등 기록관리시스템 기능요건(NAK/S 24:2014(v1.0))" 표준의 제정은 각 기관이 자체적으로 기록관리시스템을 구축할때 공통적으로 고려해야 될 기능요건과 시스템 방향성을 일치시킨다는 점에서 의의가 있다. 본 연구에서는 표준에서 제안하는 기능요건을 분석하고, 기록관리시스템 구축 사례를 중심으로 표준의 기능요건을 적용하기 위한 절차와 방안을 제시하였다. The government-affiliated organizations are required the autonomous record preservation and management, considering their management independence and specialty. In absence of general record management system for government-affiliated organizations, establishment of the standard; Functional requirements of systems with record management for government-affiliated organizations, etc. NAK/S 24:2014(v1.0) is meaningful because it can consensus the functional requirements and directions which are considered when organizations develop in-house record management systems. This study aims to analyze functional requirements and suggest procedures and strategies for application of the standard in the case of development of the record management system.

임산공학 분야 : 양성 라텍스를 이용한 도공층 구조의 최적화

김형주,황석우,박규재,이용규 ( Hyung Ju Kim,Seok Woo Hwang,Kyu Jae Park,Yong Kyu Lee ) 한국임학회 1997 한국임학회 학술발표논문집 Vol.1997 No.-

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.

갑상선 결절의 수술적 치료에 있어서 세침흡인세포검사의 진단적 유용도

김형주,정파종,Hyoung-Ju Kim,M,D,and Pa Jong Jung,M,D 대한갑상선-내분비외과학회 2001 The Koreran journal of Endocrine Surgery Vol.1 No.1

Purpose: Fine-needle aspiration cytology (FNA) and Frozen section biopsy (FS) have been used to distinguish benign lesions from malignancies and for deciding the extent of operative procedures to be used in the management of thyroid nodules. We performed this study in order to determine the diagnostic value of FNA, the need for FS in intraoperative procedures, and their value in deciding the extent of surgery. Methods: The medical records of 365 consecutive patients who had undergone surgery for thyroid nodules at the Department of Surgery, Hanyang University Hospital, between Jan. 1996 and Dec. 1998 were reviewed retrospectively. Both FNA and FS were performed on all patients who underwent thyroid surgery during this period. Among these, 35 patients who were diagnosed as insufficient for diagnosis by FNA were excluded. Results: Definitive histopathological diagnosis revealed benign lesions in 232 patients and malignancies in 98. A borderline group consisted of patients whose specimens were interpreted as follicular neoplasms by FNA and FS. The overall results for FNA and FS were as follows: sensitivity, 98 versus 100; specificity 97 versus 99; and diagnostic accuracy, 97 versus 99%. Five patients who were diagnosed with benign lesions by FNA were rediagnosed by FS as having malignant lesions. The final diagnosis was papillary carcinoma. Of the 45 patients who were interpreted borderline by FNA, 7 patients had benign lesions and 38 were borderline by FS. Finally, 34 patients were diagnosed as having benign lesions and 11 as having malignancies. Conclusion: FNA has a high diagnostic accuracy for the differential diagnosis of thyroid nodules. FS may be unnecessary for patients whose FNA results indicate malignancy, particularly in cases of papillary carcinoma, therefore the routine use of FS for patients who have been diagnosed as having a papillary carcinoma by FNA may be omitted. If FNA results are borderline, FS may be helpful in confirming a follicular neoplasm. If FNA indicates a benign status, FS seems to be necessary to decide the extent of surgery. (Korean J Endocrine Surg 2001;1:73-77)

사회적 기업가정신에 대한 사회적 자본의 매개효과가 사회적 성과에 미치는 영향

김형주,전인오,Kim, Hyung-Ju,Jeon, In-Oh 한국벤처창업학회 2017 벤처창업연구 Vol.12 No.5

The purpose of this study is to examine whether the social capital supported by social enterprises play a role in ensuring self-sustaining and sustainable growth, and to examine whether the mediating effect of social capital have a central effect on social performance. The results of this study are as follows: Innovation and orientation-to-social-value of social entrepreneurship have positive effects on structural capital, and positive influence on cognitive capital and relational capital, but innovation only has no effect. In addition, social entrepreneurship is partially mediated by structural capital. In the mediating effect between social entrepreneurship and cognitive capital, only the risk-taking and the orientation-to-social-value have a partial mediation effect on cognitive capital. However, only the initiative of relational capital was found to have a full mediating effect. And social capital has a positive effect on social performance as a whole. In conclusion, considering that the realization of economic purpose and other social purpose of social enterprises will help to develop and create jobs in the local community, and that they are engaged in business activities in a poor management environment, to provide policy support for inducing high value-added industries through industry-specific collaborations.