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FUNCTIONS OF $_{K}G_{\phi}$-BOUNDED VARIATIONS
Park, Jaekeun,Cho, Seong-Hoon 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.13 No.1
For some sequnces of monotone nondecreasing convex $\Phi$-functions $\Phi$$_1$, $\Phi$$_2$ and $\Phi$$_3$and $textsc{k}$-functions $textsc{k}$$_1$, $textsc{k}$$_2$ and $textsc{k}$$_3$, we obtain the most general Holder type inequalities, and some special cases are considered for the functions of $textsc{k}$G$\Phi$-bounded variations.
박영민(Youngmin Park),정영만(Youngman Jeong),이재근(Jaekeun Lee),박내현(Naehyun Park) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Finned-tube heat exchangers are often made with aluminum fins and copper tubes. Usually the contact between fin collar and tube surface for finned tube heat exchanger is secured by mechanical expansion of the tubes. The objective of the present study is to apprehend how much effect clearance has on the performance of heat exchanger. This effect is studied using an experimental approach. The thermal fluid measurements are made using a psychometric calorimeter. Frontal air velocity varies in the range from 1.0m/s to 3.0 ㎧. The heat transfer rate of sample which has bigger clearance is only 27% compare with the other’s in dry condition. In wet condition, its heat transfer rate is 78% compare with the other’s.
WTO 체제하의 쌀 생산전략 : 영농규모화사업을 중심으로 Farming Size Expansion Policy
박재근,임재환,구승모 충남대학교 농업과학연구소 2002 농업과학연구 Vol.29 No.2
In recent years, domestic market environment of rice production is confronted with the problems of excessive production and decrease in per capita consumption, resulting in steady decline of domestic rice price. Moreover, as new trade negotiations of WTO or FTA are being forwarded, cheap price of imported rice will also make the rice production environment being worse off. One of the possible production strategies to relieve this situation could be expanding farm size, which increases market competitiveness in terms of cost-saving. Since 1990's, one of the main agricultural policies for rice production in Korea has been expanding farm size. This study aims at 1)exploring brief history of Korean government's agricultural policy for expanding farm size, 2)examining economic effect of filming size expansion and 3)discussing major role of government to promote appropriate programs for nice-farming and producers. Main conclusion suggests that appropriate farming size should be expanded upto at least five hectares per farm, with producers' effort to reduce farming costs and continuous investments on agricultural infrastructures including irrigation systems, etc. Continuous government's investment on operation and maintenance on water facility is also one of the important factors in expanding farm size.
화학적 영향인자를 고려한 토목섬유-흙 접촉면 동적거동 특성
박인준(Park Innjoon),곽창원(Kwak Changwon),김재근(Kim Jaekeun) 한국지반환경공학회 2010 한국지반환경공학회논문집 Vol.11 No.11
최근 쓰레기 매립장에 보강 및 보호 목적으로 토목섬유가 널리 사용되고 있다. 최근 연구결과, 토목섬유-흙 접촉면에서는 진행성 파괴가 발생할 수 있는데 이는 토목섬유-흙 접촉면에서 함수비, 연직응력, 화학적 요소의 영향 등 고유물성에 기인한다. 본 연구에서는 침출수 내의 산성 및 염기성과 같은 성분의 영향이 진동하중 상태에서 토목섬유-흙 접촉면의 전단강도 감소에 미치는 영향을 실내 시험을 통하여 분석하였다. 다기능 접촉면 시험기를 새로 구축하고 서로 다른 pH 조건에서 수침시킨 토목섬유와 흙시료를 이용하여 진동 직접전단시험을 수행하여 접촉면 전단두께와 화학적 요소에 의한 접촉면의 전단강도 감소를 확인하였다. 또한 접촉면 전단강도 감소를 정량적으로 표현하기 위하여 교란상태개념에 기초하여 동하중 하의 화학적 인자들에 의한 토목섬유-흙 접촉면의 정규화 교란도 함수를 파악하고 전단강도 감소 특성을 확인하였다. Nowadays, geosynthetics for reinforcement and protection are widely applied to the waste landfill site. Current research indicates the potential for progressive failure in geosynthetic-soil system depends on the interface shear strength governed by several intrinsic factors such as moisture, normal stress, chemical, etc. In particular, the effect of the acidity and basicity from the leachate is intensively reviewed to assess the chemical reaction mechanism of interface shear strength under the cyclic loading condition. New multi-purpose interface apparatus(M-PIA) has been manufactured and the cyclic direct shear tests using submerged geosynthetics and soils under the different chemical conditions have been performed, consequently, the thickness of interface and shear stress degradation are verified. The basic schematic of the Disturbed State Concept(DSC) is employed to estimate the shear stress degradation in the interface, then, normalized disturbed function is obtained and analyzed to describe the shear stress degradation of geosynthetic-soil interface with chemical influence factors under dynamic condition.
IoT-Based Smart Garbage System for Efficient Food Waste Management
Hong, Insung,Park, Sunghoi,Lee, Beomseok,Lee, Jaekeun,Jeong, Daebeom,Park, Sehyun Hindawi Publishing Corporation 2014 The Scientific World Journal Vol.2014 No.-
<P>Owing to a paradigm shift toward Internet of Things (IoT), researches into IoT services have been conducted in a wide range of fields. As a major application field of IoT, waste management has become one such issue. The absence of efficient waste management has caused serious environmental problems and cost issues. Therefore, in this paper, an IoT-based smart garbage system (SGS) is proposed to reduce the amount of food waste. In an SGS, battery-based smart garbage bins (SGBs) exchange information with each other using wireless mesh networks, and a router and server collect and analyze the information for service provisioning. Furthermore, the SGS includes various IoT techniques considering user convenience and increases the battery lifetime through two types of energy-efficient operations of the SGBs: stand-alone operation and cooperation-based operation. The proposed SGS had been operated as a pilot project in Gangnam district, Seoul, Republic of Korea, for a one-year period. The experiment showed that the average amount of food waste could be reduced by 33%.</P>