확산길이에 따른 수동식 유기용제 시료채취기의 시료채취성능에 관한 연구

이병규,장재길,정지연,Lee, Byung-Kyu,Jang, Jae-Kil,Jeong, Jee-Yeon 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.6

Passive samplers have been used for many years for the sampling of organic vapors in work environment atmospheres. Currently, all passive samplers used in domestic occupational monitoring are foreign products. This study was performed to evaluate variable parameters for the development of passive organic samplers, which include the geometry of the device and diffusive length for the sampler design. Four prototype diffusive lengths; A-1(4.5 mm), A-2(7.0 mm), A-3(9.5 mm), A-4(12.0 mm) were tested for adsorption performances to a chemical mixture (benzene, toluene, trichloroethylene, and n-hexane) according to the US-OSHA's evaluation protocol. A dynamic vapor exposure chamber developed and verified by related research was used for this study. The results of study are as follows. The results in terms of sampling rate and recommended sampling time test indicate that the most suitable model was A-3 (9.5 mm diffusive lengths on both sides) for passive sampler design in time weighted average (TWA) assessment. Sampling rates of this A-3 model were 45.8, 41.5, 41.4, and 40.3 ml/min for benzene, toluene, trichloroethylene, and n-hexane, respectively. The A-3 models were tested on reverse diffusion and conditions of low humidity air (35% RH) and low concentrations (0.2 times of TLV). These conditions had no affect on the diffusion capacity of samplers. In conclusion, the most suitable design parameters of passive sampler are: 1) Geometry and structure - 25 mm diameter and 490 $mm^2$ cross sectional area of diffusion face with cylindrical form of two-sided opposite diffusion direction; 2) Diffusive length - 9.5 mm in both faces; 3) Amount of adsorbent - 300 mg of coconut shell charcoal; 4) Wind screen - using nylon net filters (11 ${\mu}m$ pore size).

Elastase Inhibitor 생성 방선균의 탐색 및 동정

이병규,강희일,이계준,Lee, Byung Kyu,Kang, Hee Il,Lee, Kye Joon 한국미생물학회 1997 미생물학회지 Vol.33 No.4

Elastase inhibitor (EI) producing microorganisms were screened by microplate-assay of culture broth using Succinyl-$(Alanine)_3$-Nitroanilide as a chromogenic substrate. The portion of microorganisms showed EI activity above 90% was about 2% of all assayed. Isolated SMF-11 showed relatively high EI activity after filtration using membrane filter of NMWL 3,000. SMF-11 was identified as Streptomyces sp. according to results of morphological or physicochemical identification. SMF-11 has both rectiflexible and spiral spore chains with smooth spore surface and cell wall contained LL-DAP, iso- and anteiso-fatty acids. The amino acids in cell wall were alanine, glutamic acid and glycine. Fifty unit characters for major cluster were tested and the data were analyzed numerically using the TAXON program. The isolate SMF-11 was identified as a strain of Streptomyces lavendulae. Elastase 저해물질(EI) 생성균주로 토양분리주 SMF-11을 선별하였다. 분리주 SMF-11는 매끈한 표면의 rectiflexible 및 spiral의 포자 사슬을 동시에 형성하고 세포벽 성분으로 LL-DAP, ios- 및 anteiso-fatty acid($C_{14}-C_{17}$), 세포벽 아미노산으로 alanine, glutamic acid, glycine을 가지고 있어 방선균속으로 분류되었다. 종 수준의 동정을 위하여 화학적 시험과 50가지의 단위형질에 대한 특성을 조사하고 TAXON program으로 수리분류한 결과, SMF-11 분리주는 방선균 주군집 61의 중심균주인 Streptomyces lavendulae로 동정하였다.

멀티채널 환경에서 데이터 브로드 캐스트를 위한 효율적인 인덱싱 방법

이병규(Byung-Kyu Lee),정성원(Sungwon Jung) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1A

본 논문에서는 높은 대역폭(Bandwidth)을 가지는 싱글채널(Single Channel)로 결합될 수 없는 낮은 대역폭의 멀티채널(Multi Channel) 환경에서의 브로드캐스트(Broadcast)를 위한 효과적인 인덱스 방법을 제안한다. 최근에 들어 멀티채널에서 데이터 브로드캐스트의 인덱스 방법에 대한 많은 연구가 행하여 졌는데, 트리구조의 사용 여부에 따라 두 가지 방법으로 구분해 볼 수 있다. 트리 구조를 이용한 방법은 서버의 부담을 증가시키지만 트리 구조를 이용하지 않은 방법보다 모바일 유저에게 낮은 대기시간을 제공할 수 있다. 이 논문에서는 기존의 방법들이 가지는 채널의 수나 데이터의 크기에 제한을 두는 단점을 해결하고 접근 빈도가 높은 데이터에 대한 인덱스들의 반복 정도를 높여서 모든 인덱스에 대한 대기시간(Latency)의 평균값을 현저하게 줄일 수 있는 효과적인 인덱스 스케줄 생성 방법을 제시한다.

고령사회에 대비한 노인의 부양실태와 부양의식 및 이중부양에 관한 연구

이병규(Lee, Byung Kyu),조순점(Joe, Soon Joem) 21세기사회복지학회 2020 21세기사회복지연구 Vol.17 No.2

연구는 초고령사회에 대비하여 부양의무자의 연령대에 따라 노인의 부양실태와 부양의식 및 이중부양의식의 차이를 규명하기 위하여 설문지 320부를 SPSS WIN 22.0으로 분석한 결과는 다음과 같다. 첫째, 노인부양자의 부양실태는 부모님 건강상태, 부모님 경제 문제해결, 부모님 부양이유, 부모님 대화상대에서 차이는 연령대에 따라 유의하게 나타났다. 둘째, 노인부양자의 부양의식은 부양이유 의견, 부모님 부양자 의견. 부모님 부양 시 경제권 의견, 부모님 부양 시 식생활 의견에서 차이는 연령대에 따라 유의하게 나타났다. 셋째, 노인과 자녀의 이중부양은 이중부양 의견, 조건적 이중부양 의견, 신체 부양의 책임 주체 의견, 도구 부양의 책임주체 의견에서 차이는 연령대에 따라 유의하게 나타났다. This study is a study to find out what differences exist in the elderly s Support Status, supporting consciousness, and double care consciousness according to the age-specific factors of the elderly in preparation for the Super-Aged Society. 320 copies of questionnaires were analyzed using the SPSS WIN 22.0 program. The results of the study were as follows: First, looking at the status of the elderly care according to the age-specific factors of the elderly the elderly, the difference in parents health status, the difference in solving the parents economic problem, the difference in the reasons for supporting the parents, and the difference in the parents conversation partner showed significance. Second, looking at differences in the elderly s supporting consciousness according to age-specific factors of elderly, differences in opinions of reasons for support of parents, differences of opinions of parents supporters, differences in opinions of the economic sphere when supporting parents, and differences in opinions on dietary life when raising parents were shown significance. Third, looking at the double care of the elderly and children according to the age-specific factors of the elderly and their children, differences in opinions of double care, differences in opinions of conditional double care, differences in opinions of the persons responsible for physical support, opinions of the persons responsible for tool support. the difference in them showed significance.

17대 국회의원들간 공동발의 연결망 형성의 메커니즘 분석

이병규 ( Byung Kyu Lee ),염유식 ( Yoo Sik Youm ) 연세대학교 사회발전연구소 2009 현대사회와 문화 Vol.29 No.-

지금까지의 사회 연결망 연구는 대부분 연결망을 주어진 것으로 보고, 연결망 내에서 행위자의 위치를 살펴보거나 연결망 자체의 특성에 대해서 탐구해왔다. 다시 말해, 연결망에서 관계에 해당하는 연결(tie) 그 자체보다는 그러한 연결이 행위자(actor)의 특성으로 요약되어 변수로 사용되거나 연결이 결합되어 나타나는 연결망의 패턴을 관찰하는 방법이 주로 이용되었다. 하지만, 본 연구에서는 연결망을 종속변수로 취급한 뒤 통계적으로 모형화하여 추정하는 모형(Exponential Random Graph Model)을 이용하여 연결망이 어떻게 형성되는가에 대해 분석하였다. 분석에 사용된 자료는 17대 국회의원들 사이의 4년간 공동발의 자료이며 완전 연결망(Complete Network) 자료로서 17대 국회 보건복지위원회에서의 공동발의 연결망을 대상으로 한다. 연구 결과 보건복지위원회 내의 법안발의 과정에서 비례대표의 영향은 없었으며, 정당의 효과가 중요한 것으로 나타났다. 그리고 국회 법안발의 연결망의 경우에도 기존 사회연결망 연구에서 중요한 연결망 형성원칙으로 지목되는 상호호혜성의 원칙("reciprocity": "내가 친구로 지목하는 이는 나를 친구로 생각한다")과 이행성("transitivity": "친구의 친구는 곧 나의 친구가 된다")의 원칙이 법안 공동발의 과정에 중요한 역할을 하고 있다는 것을 확인할 수 있었고, 특히 정당의 역할에 있어서 여당이 법안 자체를 야당에 비해 더 발의하거나 더 제안받지는 않지만 집중도의 측면에서 여당이 야당에 비해 집중적으로 법안을 제기하고 법안을 제안받는 역할을 하고 있다는 것을 밝혀내었다. 본 연구는 사회 연결망 형성의 메커니즘을 밝히는 시도라는 데 가장 큰 의의가 있으며, 특히 연결망 내에서 연결(tie)들 간에 독립성에 대한 비현실적인 가정이 아니라 복잡한 사회 시스템의 상호의존성에 대한 가정을 차용함으로써 보다 실제에 가까운 모델링을 할 수 있었다는 데 그 의의가 있다. 또한, 기존의 국회의원들의 행태에 대한 설명에 있어서 정당이 중요한 변수라는 것을 통계적 검증을 통해 재확인할 수 있었으며, 국회의원들이 누구와 어떻게 법안을 주고 받게 되는지에 대한 답을 찾고자 하였다. 본 연구는 향후 사회연결망 형성의 메커니즘을 밝혀내는 큰 첫걸음이 되어줄 것으로 기대된다. Most network studies in social science treated social networks as given and focused on the diverse effects of social networks. This study tried to examine how co-signing networks in the Korean National Assembly had formed and evolved, instead. This type of studies that model social ties as dependent variables had one serious methodological problem: social ties are supposed to be dependent unlike the traditional statistical model that assumes independent and identical distribution of observations. In other words, ties from A to B are usually dependent on the ties from B to A (or they are also dependent on ties from A to C) and this kind of dependency makes traditional statistical analyses impossible to apply. This paper utilized P-net model (or Exponential Random Graph Model) that allows dependency between ties to examine how co-signing networks have formed and evolved. By using the co-sponsoring network data of 17th Korean National Assembly, this study revealed the three interesting characteristics on the formation of co-signing networks among 17th Korean Congressmen in the Standing Committee of Health and Welfare. First, with compared to opposition-party congressmen, congressmen of ruling party were less likely to propose or be proposed for bills. Also they showed higher concentration among very active congressmen with regard to proposing or being proposed. Thus, bill proposals are more concentrated on a few congressmen and also less active in general among ruling-party congressmen. Second, both the existence of reciprocity and transitivity were confirmed. Congressmen were more likely to propose each other (reciprocity). Also if congressman A proposes a bill to B and B proposes another bill to C, then A is more likely to propose a bill to C (transitivity). This transitivity implies some hierarchical structure in co-singing networks. Finally, the activity of congressmen assigned by proportional representation did not show any difference from the activity of congressmen for specific district. This finding suggests that proportional representation congressmen who were expected to behave in a freer way based on their professional knowledge or career actually proposed and cosigned in the same way congressmen for specific district did.

체육계열 입시생의 스포츠가치관이 진로태도성숙 및 진로준비행동에 미치는 영향

이병규(Lee, Byung-Kyu),김준(Kim, Jun) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.3

The aim of this study is to identify the relationship among sports values, career attitude maturity and career preparation behavior of students preparing for entrance to college of physical education. For this, 188 people are selected from 10 sports academy using convenience sampling method. Multiple regression analysis in SPSS 21.0 FOR Windows statistical package is used and the results are presented as follows: First, social value, economic value, and physical value in sports values of students preparing for entrance to college of physical education have a positive influence on career attitude maturity. Second, economic value and physical value in sports value of students preparing for entrance to college of physical education have a positive influence on career preparation behavior.

굴삭기 버켓의 내구평가 기법에 관한 연구

이병규(Byung Kyu Lee),강현대(Hyun Dai Kang),김무승(Moo Seung Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.4-2

현미죽 적합 품종 선정을 위한 현미 품종별 이화학적 특성

이진영,박혜영,이병원,박현수,안억근,김민영,이유영,김미향,이병규,김현주,Lee, Jin Young,Park, Hye Young,Lee, Byung Won,Park, Hyun-Su,Ahn, Eok-Keun,Kim, Min Young,Lee, Yu Young,Kim, Mi Hyang,Lee, Byung Kyu,Kim, Hyun-Joo 한국식품영양학회 2020 韓國食品營養學會誌 Vol.33 No.2

We investigated the physicochemical properties of brown rice by cultivar to select cultivar suitable for making brown rice porridge. The moisture content of the brown rice ranged from 8.79~11.78% with the highest varieties being 'Geonyangmi'. The crude ash and crude lipid content ranged from 1.02~1.65% and 1.65~3.26%, while the rest were similar except for 'Daebo'. Crude protein also had the lowest 'Daebo' and generally glutinous rice showed higher crude protein content than common rice. The hardness showed that 'Seolgaeng' and 'Keunnun' were the lowest, and 'Haiami' was the highest. In the RVA analysis, the setback was in the range -80.61~22.44 and was low in the order of 'Wolbaek', 'Baekjinju'', and 'Dongjinchal'. As a result of water binding capacity (WBC) measurement, 'Sindongjin', 'Geonyang' and 'Samkwang', were high in common rice, and 'Dongjinchal' and 'Hwaseonchal' were high in glutinous rice. Generally, solubility and swelling power in common rice was found to be lower than in glutinous rice. As a result, 'Samkwang' is considered suitable for brown rice porridge production because of high WBC, breakdown, and low setback.

수소저장합금을 이용한 p-GaN ITO 투명전극과 Au 전극과의 특성비교

채승완,김철민,김은홍,이병규,신영철,김태근,Chae, Seung-Wan,Kim, Chul-Min,Kim, Eun-Hong,Lee, Byung-Kyu,Shin, Young-Chul,Kim, Tae-Geun 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.7

In this work, the electrical and optical properties of the two different p-type GaN electrode schemes, ZnNi/ITO and ZnNi/Au, were compared each other, and applied to the top-emitting GaN/InGaN light-emitting diodes (LEDs). The ZnNi/ITO electrode showed much higher transmittance (90%) and slightly lower contact resistance $(1.27{\times}10^{-4}{\Omega}cm^2)$ than those (77%, $(2.26{\times}10^{-4}{\Omega}cm^2)$) of the ZnNi/Au at a wavelength of 460 nm. In addition, GaN LEDs having ZnNi/ITO showed accordingly higher light output power and luminous intensity than those having ZnNI/Au did at the current levels up to 1 A.

발효, 세포배양, 생물공정 Tolypocladium inflatum을 이용한 Cyclosporin A 발효에서 아미노산과 유기질소원의 영향

김정근 ( Jeong Keun Kim ),이병규 ( Byung Kyu Lee ),장석원 ( Seog Won Chang ),박용덕 ( Yong Deok Park ),노용택 ( Yong Taek Rho ) 한국미생물생명공학회 2009 한국미생물·생명공학회지 Vol.37 No.2

Cyclosporin, an immunosuppressant, is a representative group of biologically active secondary metabolites produced by the fungus Tolypocladium inflatum. The amount and ratio of cyclosporin derivatives in the culture broth are an important factors for the production of cyclosporin A and the purification in the industrial process. Therefore, we studied the effect of amino acids and complex organic nitrogen sources using Tolypocladium inflatum mutants on the productivity of cyclosporin A and the ratio of cyclosporin derivatives. Overproducing mutant YHC-004 having seven times higher productivity than mother strain`s could be obtained through the artificial mutation by UV irradiation. The concentration and kind of organic nitrogens and amino acids shows the profound effect on the productivity of cyclosporin A and ratio of cyclosporin derivatives. As a result, it was possible to raise the productivity and the ratio of cyclosporin A up to 3,430 mg/L and 93% respectively, but on the other hand the other cyclosporin derivatives decreased less than 2% in the culture broth.