• Proceeding of Spring/Autumn Annual Conference of KHA
• /
• 1994.10a
• /
• pp.43-49
• /
• 1994

In Korea, the rental apartments for low-income bracket have greatly been built and are being built now. But their management system is quite unstable and the residents' participation in the management is excluded throughly from the beginning. As a result, there are increasing complaints about their low quality of management as well as a self-righteous managerial behavior by the housing company. Therefore, it is required to be managed by residents in the rental apartmenr and especially the organization of management, such as decision making-executing-audition body, should be operated by the residents. To achieve this purpose, the management law should be consolidated into one and the method o imposing the expenses of repairing and maintenance should be improved by The Ministry of Construction and Transportation.

• Clinical and Experimental Pediatrics
• /
• v.57 no.11
• /
• pp.465-471
• /
• 2014

Inflammatory bowel disease (IBD) is a chronic relapsing disorder of unknown etiology, which is believed to be multifactorial. Recently, the incidence of pediatric IBD has steeply increased in Korea since 2000. Poorly controlled disease activity can result in complications such as intestinal fistulae, abscess, and stricture, as well as growth retardation and delayed puberty in children. Because of a lack of confirmative tests, various diagnostic modalities must be used to diagnose IBD. Onset age, location, behavior, and activity are important in selecting treatments. Monogenic IBD must be excluded among infantile and refractory very-early-onset IBD. Early aggressive therapy using biologics has recently been proposed for peripubertal children to prevent growth failure and malnutrition.

• Journal of Institute of Control, Robotics and Systems
• /
• v.17 no.9
• /
• pp.882-887
• /
• 2011

A spiral electrodynamic wheel is proposed as an actuator for the contactless conveyance of a conductive rod. When rotating the wheel around the rod, a radial force, a tangential force, and an axial force are generated on the rod and cause a screw motion of the rod. The rotation of the rod is the inevitable result due to traction torque of the wheel and the unintended motion to be excluded. However, the rotating speed of the rod should be measured without mechanical contact to be cancelled out through the controller, so the electrodynamic wheel is used as a sensor measuring the rotating speed of the rod indirectly as well as an actuator. In this paper, we model the magnetic forces by the proposed wheel theoretically and compare the derived model with simulation result by Maxwell, and analyze influences on the magnetic forces by key parameters constituting the wheel. The feasibility of the conveyance system is verified experimentally.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.17 no.30
• /
• pp.209-214
• /
• 1994

A consecutive k out of n failure lines with sink-source parts is a system of components in sequence such that the system fails whether some k consecutive components are all fail. Some object, be it a flow, is to be relayed from a source to a sink through a sequence of intermediate stations(components). Now care should be taken as to if the source and the sink are also considered components of the systems, i. e. , whether they serve the same function as the intermediate components (stations). Such systems are different from ordinary consecutive k- out of n failure lines by adding the on source and sink pole[6]. The main properties of the reliability by the optimal redundancy of consecutive k out of n failure lines are presented under this modification.

• Journal of the Korean Society of Safety
• /
• v.9 no.4
• /
• pp.3-10
• /
• 1994

This study examines fracture characteristics of wire rope of 6$\times$37+FC 14mm B degree, Which has been widely used for the strength support for machinery, cranes and shipping. The examination Is based on the fellowing experimental conditions. Firstly, this study analyzes the effect of the strength of wlre rope. When number of broken wires is occuring at the level of 5%, 10% and 15% degree respectively in the following two cases：1) Case of broken down to each strand equally. 2) Case of broken down to one strand only. Secondly, this study analyzes the effect of corrosion on the strength of wire rope. Corrosion times are 72hours, 144hours and 216hours corrosion respectively under following conditions. 1) Case of only a corrosion without wire breaking. 2) Case of corrosion after 5% degree wire breaking to each strand equally. Some outcomes of these experiment are as follows. 1) From the of tension test, We can find that the ratio of strength reduction case of wire broke down to one strand concentrically is greater than that ratio case of broke down to each strand equally. 2) From the corrosion test, We can also find that the ratio of strength reduction case of corroded after 5% degree wire breaking to each strand equally Is greater than that ratio case of corroded without wire breaking. 3) After comparing theoretical fracture load of wires with experimental fracture load of wires, we can find the fracture load of the case of broken down to each strand equally is most similar to theoretical fracture load. 4) It is proposed that safety rules on wire rope in the Industrial safety and healthy labor of law have to change “breaking over 10% of number of wires in one strand of wire rope(excluded filler wire )”has to be replaced by“breaking over 10% of number of all wires in all strand of wire rope(excluded filler wire)”

• Environmental and Resource Economics Review
• /
• v.9 no.4
• /
• pp.597-619
• /
• 2000

Marketable permit system (MPS) is a economic incentive instrument that allows polluters to achieve static and dynamic efficiency, However, Korea's atmospheric regulations are primarily based upon command and control (CAC) system and partly upon economic incentive instruments, which fail to realize its relative effectiveness, Accordingly, an introduction of MPS has been recommended with the cost effectiveness analysis in numerous studies, The literature, however, did not consider the relationship between MPS and the existing regulations, which is a key factor for the successful introduction of MPS, This paper provides a set of principles to judge how the existing regulations are reconciled with the introduction of MPS, In addition, authors execute an empirical study to show MPS's cost effectiveness when regulators apply MPS in Ulsan area for the abatement of sulfur dioxide, The results suggest that the regulations such as fuel regulation should be excluded when implementing MPS, and a flexibility in legal and regulatory system is to be required in order to secure a successful implementation of MPS.

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2017.06a
• /
• pp.106-106
• /
• 2017

The soybean [Glycine max (L.) Merr.] is one of the most important crop resources worldwide as food and forage. It is also important and valuable that to hold crop resources to have high genetic diversities. Recently, a core collection has been constructed in many plants to preserve the genetic resources of various plants. A core collection is small population to represent the genetic diversity of the total collection, and is of strategic importance as they allow the use of a small part of a germplasm collection that is representative of the total collection. Here, we developed the core collection consisting of 816 accessions by using approximately 180,000 (180K) single nucleotide polymorphisms (SNPs) developed in previous study. In addition, we performed genetic diversity and population structure analysis to construct the core collection from entire 4,392 collections. there were excluded sample call rates less than 93% and duplicated samples more than 99.9% according to genotype analysis using 180K SNPs from entire collections. Furthermore, we were also excluded natural hybrid resources which Glycine max and Glycine soja are mixed in half through population structure analysis. As a result, we are constructed the core collection of genetic diversity that reflects 99% of the entire collections, including 430 cultivated soybeans (Glycine max) and 386 wild soybeans (Glycine soja). The core collection developed in this study should be to provide useful materials for both soybean breeding programs and genome-wide association studies.

• Korean Journal of Social Welfare
• /
• v.56 no.2
• /
• pp.237-259
• /
• 2004

The public assistance scheme plays more important role in income maintenance for poor elders than the public pension does due to insufficient coverage of the public pension resulted from late introduction of it in Korea. However, only limited numbers of poor elders are financially protected by the public assistance contrary to the general perception that the elderly population most benefits from public aids. Based on data set of 2000 from the Korean Labor and Income Panel Study, this study analysed the size, composition and characteristics of poor elders excluded from the public assistance, and determinants of the elderly's participation in it. Findings of the study can be summarized as follows: (1) More than half of poor elders are excluded from the public assistance although their economic status is similar with that of recipients, which may cause income reversal between recipients and non-recipients. (2) It was identified that non-recipient poor elders especially those with same income level of recipients of the National Livelihood Guarantees(NLG) are actually in desperate need of public aids considering their serious financial conditions. (3) Participation in public assistance among the elderly is more affected by socio-demographic factors that reflect family conditions than by economic factors, which is mostly caused by the strict eligibility criteria of the public assistance that reinforces family duty of financial support for elderly relatives in Korea. Policy implications for more effective income security for poor elders include revising inappropriate eligibility criteria of the NLG concerning family obligations, expanding the coverage of the old age allowance for poor elders to near-poor elders, and providing work opportunities to non-recipient poor elders to supplement their income deficit.

• Journal of the Korean Society of Radiology
• /
• v.14 no.1
• /
• pp.31-37
• /
• 2020

This study was conducted to examine the kinds and the frequency of incorrect outcomes occurring depending examiners' skills, in testing osteoporosis by using Dual Energy X-ray Absorptiometry(DXA) and improve frequently occurring errors by educating them. The results of an analysis show that the outcomes from the test of hips in patients with wrong postures or some regions with pressure fracture and degenerative changes were often included, even though they should be excluded, and that surgical instruments were also included in the analysis, though they should be excluded from resulting values. Of them, the errors most often found were those about patients' postures (n=56, 6 cases for spines and 50 cases for hips), followed by those about analytical processes (n=37, 35 cases for spines and 2 cases for hips), and then those about regions of interest (n=33, 28 cases for spines and 5 cases for hips). There were, however, no errors caused by the defectiveness of quality control.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1994.10a
• /
• pp.831-836
• /
• 1994

This paper presents rational modeling and analysis method for complex structures with various structural joints. For modeling of structural joint, a general modeling technique is newly proposed by flexibility influence coefficient and inverse of flexibility matrix and static reduction concept which is applied to the retained DOFs(degrees of freedom) of detailed finite element model of struction joints. By this method,joint model with contact surface. which can not be reduced by the general reduction theory such as Guyan reduction theory ,can be reduced effectively. And in this method, the nonlinearity of the contact surface can be linearized within a proper range and the boundary effects of joint region can be excluded. Using the proposed method, screwed joint,glued joint and bolted joint are analyzed. And the effectiveness of the proposed method is verified by experiments.