경쟁시장 환경하의 생산정보의 전략적 활용

김준하,이창호 한국경영과학회 1994 한국경영과학회 학술대회논문집 Vol.- No.1

점차적으로 다양해져 가는 고객의 요구에 따라, 전자산업에 민감한 영향을 받는 엔지니어링 플라스틱 생산체제도 점차 다품종 소량 생산체제로 전환하고 있다. 이에 따라 기업의 내부조직에 있어서 생산성을 우선적으로 고려하는 생산부문과 납기를 우선적으로 고려하는 영업부문과의 생산스케쥴링에 관한 협의업무가 전체 생산성을 저하시키는 요인으로 작용하고 있다. 본 시스템은 생산스케쥴링을 자동적으로 작성함으로써 영업부문에 스케쥴링 능력을 부여함으로써, 생산스케쥴링업무를 단일화하여 양 부문간의 협의업무를 간소화하고 생산부문에서는 생산에만 전력할 수 있도록 하여 전체 생산성을 향상시키는데 그 목적이 있다. 본 시스템의 개발에 있어서 전문가시스템 개발 tool로는 ART-IM을 사용하였고, GUI는 OSF/Motif로 구현하였다.

산업폐기물과 토착미생물을 이용한 중금속 오염부지의 고형화/안정화 특성에 관한 연구

김준하,박윤수,이재영 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.3

The purpose of this study was to suggest feasible disposal methods for heavy-metal-contaminated soil or mine tailings through solidification/stabilization. To improve the compressive strength and enhance the heavy-metal stabilization after solidification/stabilization, we used the industrial wastes (oyster shell powder and waste gypsum) and indigenous bacteria as immobilization agents. Three indigenous bacteria were isolated from each heavy-metal-contaminated soil or mine tailing site, and the bacteria were identified by cellular fatty acid composition analysis. The results of cellular fatty acid composition analysis showed that the closest strains of these bacteria are Brevibacillus centrosporus, Lysinibacillus sphaericus, and Bacillus megaterium. To the best of our knowledge, this research was the first report of biomineralization by Brevibacillus centrosporus. As a result of mixing additives with the optimum mixing ratio suggested in this study, the compressive strengths of specimens were satisfied in accordance with the US Environmental Protection Agency (EPA) waste treatment standard after 28 days of aging. Additionally, the results of the Toxicity Characteristics Leaching Procedure (TCLP) and Synthetic Precipitation Leaching Procedure (SPLP) analysis showed the successful immobilization of heavy metals after 28 days of specimen formation for solidification/stabilization.

알칼리 연료전지용 폴리(아릴렌 에테르 설폰)고분자의 합성과 bromination 조절을 통한 막의 특성 분석

김준하,김상희,유동진 한국에너지학회 2019 한국에너지공학회 학술발표회 Vol.2019 No.5

정삼투공정 모델링 및 적용

김준하 한국막학회 2015 한국막학회 총회 및 학술발표회 Vol.2015 No.11

Modeling of forward osmosis (FO) membrane system is significantly affected by various factors such as membrane properties of materials (A, B), structure parameter (S), concentration polarization (CP), fouling, spacer design. etc. In this study, FO performance of a plate and frame type membrane is investigated via a numerical simulation based on mass conservation theorem and finite element method (FEM). To evaluate the FO membrane performance, permeate flux and recovery rate are simulated according to membrane orientation, flow direction of feed and draw solutions, flow rates, membrane structure parameter (S), and design of spacers. The modeling results can help to expand insights into FO separation characteristics and to suggest further strategy for FO process development.

호주와 싱가포르의 사례에서 본 국내 스마트워터그리드 발전방향

김준하,Kim, Jun-Ha 한국수자원학회 2011 물과 미래(한국수자원학회지) Vol.44 No.8

하수차집관로 준설토양의 콘크리트골재 적용성 평가에 관한 연구

김준하,김형욱,김인식,이재영,Kim, Joon-Ha,Kim, Hyeong Wook,Kim, In-Sik,Lee, Jai-Young 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.2

Recently, the gap between demand and supply of natural aggregate has increased owing to the depletion of aggregate sources. Therefore, policy support is necessary for the stable supply of aggregate resources. Public and construction works experience problems when they do not receive a steady supply of aggregate. Further, instabilities in aggregate supply lead to increases in aggregate prices, and consequently construction costs. As a result, the likelihood of poor construction using low-grade aggregate increases. It is therefore crucial to put measures in place that deal with these issues. This study aims to reduce the load imposed by aggregate use on the environment by recycling soil dredged from sewage ducts to reduce the gap between supply and demand of fine aggregate. The dredged soil is assessed using an applicability test for quality characteristics and solidification with basic properties. This study aims to secure the safety of dredging soil and solidified objects through interior physical and chemical analyses and to utilize it as a base material for concrete solidification in the future.

韓國春蘭 (Cymbidium goeringii)에서 分離된 菌根菌에 관한 硏究

張茂雄,鄭載東,林箕柄,金俊夏 嶺南大學校 基礎科學硏究所 1992 基礎科學硏究 Vol.12 No.-

韓國의 自生春蘭의 根莖 및 뿌리에 있어서 菌根菌의 存在樣式, 菌根菌의 分離 및 同定, 菌根菌이 種子發芽에 미치는 影響에 대해 조사한 結果는 다음과 같다. 1. 自生春蘭의 뿌리와 根莖을 走査電子顯微鏡으로 관찰한 결과 ,뿌리와 根莖의 表面, 皮層細胞內에서 菌絲가 확인되었다. 특히 根莖의 皮層細胞內에서는 多數의 菌絲와 菌毬가 반드시 관찰되었다. 組織培養에 의해 形成된 根莖에서는 菌絲와 菌毬를 관찰할 수 없었다. 2. 春蘭의 뿌리와 根莖에서 分離된 3菌株中; KR002와 KR 003는 RHizoctonia repens로, KR 001은 RHizoctonia spp.로 同定하였다. 3. 이 3菌株를 組織培養에서 얻어진 無菌狀態가 확인된 根莖에 再接種한 結果, 皮層組織內에 菌絲의 侵入이 확인되었다. 4. 純粹培養된 KR 003의 菌株만이 春蘭의 種子發芽를 促進하였다. Mycorrhizal fungi (Rhizoctonia spp.) were isolated from the roots and rhizomes of Cymbidium goeringii collected from Kwangju and Tamyang. The results of the experiments on mycorrhizal fungi are summarized as follows. Active mycorrhizal fungi observed under scanning electron microscope were on the surface and in the cortical cells of the roots and rhizomes, and a number of undigested or partially digested peloton in the cortical cells of the rhizomes. Rhizoctonia repens group (KR 002, KR 003) and Rhizoctonia spp. (KR 001) were isolated from the roots and rhizomes of C. goeringii in Kwangju and Tamyang. In the back-inoculation test of Rhizoctonia spp., the infection of rhizomes formed by tissue culture were observed. Effects of Rhizoctonia spp.(KR 001,002,003) on the germination test of mature seeds were investigated on oat-meal agar. The promotion of germination was observed only in Rhizoctonia repens (KR003).

Low Cost Omnidirectional 2D Distance Sensor for Indoor Floor Mapping Applications

김준하,이준호 한국광학회 2021 Current Optics and Photonics Vol.5 No.3

Modern distance sensing methods employ various measurement principles, including triangulation, time-of-flight, confocal, interferometric and frequency comb. Among them, the triangulation method, with a laser light source and an image sensor, is widely used in low-cost applications. We developed an omnidirectional two-dimensional (2D) distance sensor based on the triangulation principle for indoor floor mapping applications. The sensor has a range of 150–1500 mm with a relative resolution better than 4% over the range and 1% at 1 meter distance. It rotationally scans a compact one-dimensional (1D) distance sensor, composed of a near infrared (NIR) laser diode, a folding mirror, an imaging lens, and an image detector. We designed the sensor layout and configuration to satisfy the required measurement range and resolution, selecting easily available components in a special effort to reduce cost. We built a prototype and tested it with seven representative indoor wall specimens (white wallpaper, gray wallpaper, black wallpaper, furniture wood, black leather, brown leather, and white plastic) in a typical indoor illuminated condition, 200 lux, on a floor under ceiling mounted fluorescent lamps. We confirmed the proposed sensor provided reliable distance reading of all the specimens over the required measurement range (150–1500 mm) with a measurement resolution of 4% overall and 1% at 1 meter, regardless of illumination conditions.

감마선 스펙트럼 비율을 이용한 매립 선원의 깊이 평가 방법론 개발 연구

김준하,정재학,홍상범,서범경,이병채,Kim, Jun-Ha,Cheong, Jea-Hak,Hong, Sang-Bum,Seo, Bum-Kyung,Lee, Byung Chae 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.1

This study was conducted to develop a method for depth assessment of embedded sources using gamma-spectrum ratio and for the evaluation of field applicability. To this end, Peak to Compton and Peak to valley ratio changes were evaluated according to ¹³⁷Cs, ⁶⁰Co, ¹⁵²Eu point source depth using HPGe detector and MCNP simulation. The effects of measurement distance of PTV and PTC methods were evaluated. Using the results, the source depth assessment equation using the PTC and PTV methods was derived based on the detection distance of 50 cm. In addition, the sensitivity of detection distance changes was assessed when using PTV and PTC methods, and error increased by 3 to 4 cm when detection distance decreased by 20 cm based on 50 cm. However, it was confirmed that if the detection distance was increased to 100 cm, the effects of detection distance were small. And PTV and PTC methods were compared with the two distance measurement method which evaluates the depth of source by the change of net peak counting rate according to the detection distance. As a result of source depth assessment, the PTV and PTC showed a maximum error of 1.87 cm and the two distance measurement method showed maximum error of 2.69 cm. The results of the experiment confirmed that the accuracy of the PTV and PTC methods was higher than two distance measurement. In addition, Sensitivity evaluation by horizontal position error of source has maximum error of less than 25.59 cm for the two distance measurement method. On the other hand, PTV and PTC method showed high accuracy with maximum error of less than 8.04 cm. In addition, the PTC method has lowest standard deviation for the same time measurement, which is expected to enable rapid measurement.

침수사례 및 관련 데이터를 활용한 초고층 건축물의 침수 대책에 관한 연구

김준하,김태헌,김정곤,정재욱 한국재난정보학회 2018 한국재난정보학회 학술대회 Vol.2018 No.11

최근 고층건축물과 대규모 지하공간의 복합화 현상으로 인하여 건축물의 재난·재해에 대한 취약성이 높아지고 있다. 이러한 초고층 지하연계 복합개발을 하는 경우 재난상황에 대한 사전적 검토가 반드시 수행되어야하며, 상 세한 검토를 위해서는 다양한 시나리오를 구성하여 사람들의 안전한 대피가 가능한지 여부를 확인해야한다. 본 논문에서는 관련 법령 및 국내·외에서 발생한 침수사례를 조사하여 초고층 건축물의 침수원인을 분석하고 이 를 활용하여 건물내 빗물 유입량에 따른 지하공간에 대한 침수심 변화 시뮬레이션을 실시하고, 그 결과를 바탕 으로 침수심에 변화에 따른 적절한 대피방안을 검토하였다.