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조기재취직 보너스지급의 경제적 효과 : 일리노이 실험을 중심으로 Case of Illinois Experiment
黃建夏 효성여자대학교 산업경영연구소 1998 경영경제 Vol.15 No.-
The most benign view of the Unemployment Insurance system would be that it provides unemployment benefit to carry a worker through a spell of unemployment resulting from non-distortionary transfer. In addition, early re-employment bonus is included in Korean Unemployment spell. The Illinois Experiments provide the first opportunity to explore, within a controlled experimental setting, whether bonuses paid to Unemployment Insurance beneficiaries would reduce the unemployment of beneficiaries relative to a randomly selected control group. The results of the Illinois Experiments show us that the bonus shortened the spell of unemployment of beneficiaries and reduced the benefits paid by the government. However, because of the several constraints of the experiments, it is hard for us to extrapolate the experimental results to a permanent reemployment bonus program.
黃建夏 효성여자대학교 산업경영연구소 1988 경영경제 Vol.5 No.-
One of the propositions of Keynesian open economy macroeconomics that devaluation tends to increase domestic real income and output in the short run has been challenged by several authors. One of the major reasons for contractionary devaluation is that in the presence of an initial balance of trade deficit devaluation has a demand deflationary effect because of the so-called elasticity pessimism. The economic structure modelled in the contractionary devaluation argument represents the characteristics of the developing countries in the Southern Cone of Latin America where many of the contractionary devaluations have been observed. This dissertation focuses on the following two issues : (a) it attempts to examine the roll of the assumptions concerning the structure of the economy in the contractionary devaluation argument; (b) it examines the validity of the contractionary devaluation argument under different specifications of economy structure. The main conclusion derived from the analysis can be summerized as follows: 1. The contractionary devaluation is a special case based on very restrictive assumptions. The conclusion of contractionary devaluation is derives from a model in which both exports and imports are completely insensitive to relative price changes, and all imports are used as inputs in production and are directly proportional to output. Thus, with the volume of exports assumed fixed, the only channel by which devaluation can improve the trade balance it terms of foreign currency is through a negative effect on output, resulting in less need for imported inputs. 2. If the domestic demand for exportable goods and imported consumption goods are considered explicitly, the possibility of contractionary devaluation can be reduced significantly. 3. If we consider the possibilities of substitution in consumption and production, the possibility of contractionary devaluation can be reduced further.
황건하 효성여자대학교 산업경영연구소 1998 경영경제 Vol.16 No.-
There has been several experiments concerning reforms of unemployment insurance in the United States. The first one was Illinois Experiment and the second one was New Jersey Experiment. The aims of those experiments were to get strong evidence of the proposed reforms of unemployment insurance. The proposed reforms generally have sought to improve the reemployment prospects of unemployment insurance claimants and reduce the budgetary costs of unemployment insurance. The unemployment insurance experiments have taken two main forms : cash bonuses and job search programs. Illinois Experiment offered only 500 of cash bonus, while New Jersey Experiment offered job search assistance program plus cash bonus. The bonus experiments show that economic incentives do affect the speed with which people leave the unemployment. This is shown by the declines in weeks of unemployment insurance receipt found for the bonus treatments. The cost benefit analyses indicate that the bonus experiments usually lead to small net losses for the unemployment insurance program, and are break-even for society as a whole.
A survey of the genome-wide genetic variation of Hibiscus hamabo (Malvaceae)
황건하,정의찬,김상태 한국식물분류학회 2023 식물 분류학회지 Vol.53 No.2
Hibiscus hamabo (Malvaceae) is a deciduous shrub mainly found in northeast Asia, including China, Japan, and Korea. Due to its limited distribution on Jejudo Island and at several sites in Jeollanam-do in Korea, H. hamabo has been designated as an endangered species by the Ministry of the Environment and has been the subject of several restoration programs. In this study, we quantified genetic variations using double-digestion restriction associated DNA sequencing technology in 96 individuals of H. hamabo from 13 distinct populations in Korea. We determined 3,352 genome-wide single nucleotide polymorphism loci after stringent filtering processes and analyzed the level of genetic variation within and among populations as well as the population differentiation and genetic ancestry with various assumptions pertaining to the population origin. Our results indicated weak differentiations among populations surveyed in this study but clearly suggested that most of the H. hamabo populations maintain a relatively high level of genetic diversity as evidence of frequent genetic exchanges among populations via outcrossing or sequential gene flows. For a more detailed analysis of the origin of Korean H. hamabo and its demographic history, it will be necessary to expand sampling in China and Japan.
밀집된 LoRa 네트워크의 전송지연 및 전송효율 성능 검증
황건하,신경섭 한국통신학회 2023 韓國通信學會論文誌 Vol.48 No.11
현대 산업에서는 IoT가 기술의 발전과 함께 필수적인 요소로 자리잡고 있다. 그 중에서도 Low Power Wide Area Network으로서 각광받고 있는 LoRa는 저렴한 단말 비용, 비면허 대역 사용, 넓은 커버리지 등의 장점으로많은 관심을 받고 있다. 그러나 LoRa 단말의 증가는 통신 환경에 부정적인 영향을 미칠 수 있다. 본 논문에서는밀집된 LoRa 통신환경을 구성하여 단말의 증가와 전송 데이터의 증가가 실제 통신환경에 미치는 영향을 정량적으로 분석하였다. 이 연구를 통해 실제 환경을 반영하여 단말의 증가로 인해 통신 성능이 감소한다는 사실을 입증하였으며, 이는 향후 혼잡한 IoT 환경에 관한 연구에 근거 자료로 활용될 수 있을 것으로 기대된다