부동산개발이익의 배분에 관한 탐색적 연구

최혁재(Choi, Hyuk Jae),장희순(Jang, Hee Soon) 대한부동산학회 2021 大韓不動産學會誌 Vol.39 No.1

이 연구는 부동산개발사업의 성공에 중점 둔 금융 수요자(GP)와 사업참여에 신중하고 보수성향을 가진 금융 제공자(LP)간의 이익 배분의 합리성을 탐색하는 것이다. 다시 말해서, 부동산 개발사업의 지분 투자자간, 위험의 분배와 그에 비례한 합리적이고 바람직한 개발이익의 배분 구조를 규명하는 것이다. 이 연구는 2가지 관점에서 개발이익의 배분 구조를 분석한다. 첫째, 투자비율에 비례한 이익 배분 구조를 분석하고. 둘째, 허들을 추가한 상태하에서 발생하는 이익배분 구조를 탐색한다. 투자자 간의 투자비율에 비례한 이익 배분은 위험 기피적인 유한책임 투자자의 입장에서는 받아들이기 어려운 구조다. 또한 허들이 많아질수록 무한책임 투자자의 업무성과 향상은 추가수익의 발생으로 유인기능을 한다. 따라서, 부동산개발사업은 상당한 리스크를 수반하므로 워터폴 구조에 의한 무한책임 투자자와 유한책임 투자자의 개발이익 배분의 합리적 결정 모델을 제시한다. This study focuses on the possibility of structuring the business between the GP, which expects the success of the development project, and the LP, who is careful to participate in the project and has a conservative tendency. In other words, it iinvestigates a profit sharing structure between equity investors in a real estate development project and the distribution of risks and the corresponding reasonable and desirable development gains. This research will analyze Choi Hyuk-jae and Jang Hee-soon s existing research in 2020 from two perspectives. First, explore the profit-sharing structure proportional to the investment ratio. Second, we add four hurdles to identify a various profit-sharing structure. Distribution proportional to the investment ratio between each investor is difficult to accept for risk-averse limited liability employees. In addition, the more hurdles are introduced, the more additional promote is generated considering the performance of the general partner, which functions as an incentive design function. Therefore, in a real estate development project where significant risks are inherent, the distribution of development profit between the general partner and the limited partner under the Waterfall structure is inevitable.

18㎓ 대역의 2단 전송 선로 저잡음 증폭기 설계

최혁재(Hyuk Jae Choi),이제광(Je Kwang Lee),최규태(Kyu-Tae Choi),김형석(Hyeong-Seok Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

열차/지하철의 객실 및 승강장 감시를 위한 양방향 무선영상통신을 위해 정보통신부가 혼선이 없는 18~19㎓의 주파수 대역을 ‘안전 및 공공 목적을 위한 지하철(철도 포함)의 무선영상 전송장치’용으로 사용하기로 결정하였다. 본 논문에서는 18㎓ 대역에서 무선통신을 하기 위해 안테나 바로 뒷 단에 위치해 안테나로부터 전송된 신호(영상)을 잡음은 최소화 하고 본 신호(영상)는 최대로 증폭시킴으로써 양질의 무선통신이 가능하도록 하기 위한 저잡음 증폭기를 설계하였다. 18㎓ 대역에서는 동작 가능한 L, R, C 소자가 없기 때문에 전송선로로 설계하였다. 트랜지스터는 18㎓ 대역에서 잡음지수와 이득 모두 효율적으로 동작하는 NEC 社사의 NE3210S01 소자를 사용하여 Advanced Design Simulation(ADS) Tool을 사용하여 설계 및 시뮬레이션 하였다. 시뮬레이션 결과 18㎓ 대역에서 이득은 19.92㏈, 잡음 지수는 2.06㏈의 결과를 얻었다.

Ku 밴드 수신단을 위한 저잡음 증폭기 및 주파수 혼합기 설계

최혁재(Hyuk-Jae Choi),고재형(Jae-Hyeong Ko),김군태(Koon-Tae Kim),이제광(Je-Kwang Lee),김형석(Hyeong-Seok Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.2

The Ministry of Information-Communication assigned 18~19GHz frequency band for communication of cabins and platform to link between subway/train and it"s station. In this paper, we propose wireless transmission devices which are 2 stage hybrid low noise amplifier of 18GHz band and mixer for 18GHz as well to apply for RF receiver. We designed LNA to be noise matched its 1st stage and gain matched for 2nd stage and mixer using 180° hybrid coupler to suppress the spurious signal. The transistors of 18 GHz LNA and mixer are NE3210S01 of NEC and KMB-N51-1, respectively. As the result of simulation, we get 19.92dB gain and 2.06dB noise figure with LNA and 8.61dB conversion loss with mixer.

고령자 보행보조로봇 제어기법 연구

최혁재(Hyuk Jae Choi),강성재(Sung Jae Kang),권칠용(Chil Yong Kwon),류제청(Jei Cheong Ryu),이석민(Suk Min Lee),문무성(Mu Seong Mun) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.9

In this study, the control method of assistive robot was developed for the elderly. The control method of gait-assistant-robot was proposed considering the change of COP (Center of Pelves), BOS (Base of Support) and comparative analysis of the moving velocity for the elderly. We analyzed the movement of COP of the body and its velocity of the elderly equipped with manual walker and gait-assistant-robot. As a result, change in COP was greater from left to right than from anterior to posterior; also, the average velocity of the movement of COP and manual walker for manual walker gait was 0.7(m/s). Therefore, it is necessary to concern more on the left-right balance and synchronization of the velocity of COP.

노인의 보행 보조를 위한 하지 외골격

최혁재(Hyuk-Jae Choi),유준(Jun Yu),정태웅(Tae-Woong Jung),정인화(In-Wha Jung) 대한기계학회 2021 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.9 No.1

본 발명품은 총 16개의 센서를 통해 착용자의 보행 의도를 정확히 파악 가능하며, 보조가 필요한 순간에 적절한 동력을 무릎에 전달해 주는 하지 외골격이다. 본 발명품에 사용된 동력부는 상용 자전거 브레이크와 변속기 와이어를 혼합하여 사용했기 때문에 백래시(backlash)가 거의 없다. 또한 안전계수(safety factor)와 허용응력(allowable stress)을 기반으로 충격하중(impulsive load)을 고려한 구조 설계를 진행했기 때문에 안전성을 확보하였다. This invention is capable of accurately predicting the wearer’s next movement by calculating the data from 16 sensors. Therefore it can deliver adequate power to the wearer’s knee when assistance is needed. The power section used in this invention has very little backlash because it is a mixture of commercial bicycle brakes and transmission wires. In addition, safety was ensured by conducting a structural design considering the impact load based on the safety factor and allowable stress.

Zigbee시스템에 적용 가능한 Gain-Variable LNA 설계 연구

최혁재(Hyuk-Jae Choi),고재형(Jae-Hyeong Ko),최진규(Jin-Kyu Choi),김군태(Koon-Tae Kim),박준홍(Jun-Hong Park),윤선우(Sun-Woo Yun),김형석(Hyeong-Seok Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

In this paper, the techniques and design focus of flexible gain coltrol of LAN(Low Noise Amplifier) using the TSMC 0.18㎛ CMOS process. The design frequency set up a standard on 2.4㎓ that is used in Zigbee system. The design concepts a basic Cascode LNA techniques and a swiching circuit consisted of 4 NMOS of load resistance, which convert the output impedenceby tuning on or off. The result show the gain change by NMOS operated swich. The simulation result is that Gain is 10.23~12.96㏈ and NF(Noise Figure) is 1.41~1.47㏈.

부동산PF를 위한 자산유동화증권(ABS) 투자자 특성분석

최혁재(Choi, Hyuk Jae),장희순(Jang,Hee Soon) 한국주거환경학회 2021 주거환경(한국주거환경학회논문집) Vol.19 No.3

When problems arose with traditional financing vehicles, a new financing product named asset securitization was introduced. In order to ensure sustainable financing through asset securitization, it is necessary to understand the characteristics of investors in asset-backed securities market and design asset-backed securities that meet their needs and protect its investors. To this end, this study investigated and empirically analyzed the characteristics of investors through a expert group interview method targeting professionals working in investment institutions such as banks and savings banks, in addition to asset managers and securities companies with experience in designing or selling asset-backed securities. According to the empirical analysis results, it was found that institutional investors > individual investors > companies based on commercial law in this order put emphasis on recovering original investment We conjecture that due to the fiduciary obligation of the institutional investors such as pension funds and financial companies, they should manage the assets of their customers in a fiduciary manner. Through empirical analysis, the study identified the need for asset-backed securities designs that meet the needs of investors who prefer different conditions and protect investors.

부동산개발사업의 투하자본과 수익분배의 최적화 구조

최혁재(Choi, Hyuk-Jae),장희순(Jang, Hee-Soon) 한국주거환경학회 2020 주거환경(한국주거환경학회논문집) Vol.18 No.2

Currently, large-scale real estate complex development projects are in crisis due to rising land costs, discussion of the introduction of the post-sale system of residential facilities, reduced demand for office and retail facilities, and increased volatility of demand. Based on the actual large-scale real estate complex development project conducted in Seoul, this study explores the structure of defining real estate development risks, efficiently distributing related risks between GPs and LPs, and appropriately distributing the gains and losses between the two, using simulation techniques. This study aims to contribute to securing and developing a feasible business structure in the real estate development financial market in the future by designing and proposing various capital and incentive structures to control GP’s behavior from the perspective of LPs for sustainable real estate development financing.

ZigBee시스템에 적용 가능한 저주파 잡음 특성 개선의 RF 전치부 설계 연구

최혁재(Hyuk-Jae Choi),최진규(Jin-Kyu Choi),권소현(So-Hyun Kwon),김형석(Hyeong-Seok Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11

본 논문에서는 TSME 0.18㎛ 공정을 사용하여 Zigbee 시스템에 사용 가능한 대역인 2.4㎓의 RF 전치부를 설계하였다. 논문에서 제안된 캐스코드 트렌지스터에의 게이트단에 연결된 인덕터와 cross-coupling 캐패시터가 포함된 저잡음 증폭기의 구조는 차동 증폭기에서 캐스코드 트렌지스터의 잡음과 비선형 특성을 줄일 수 있는 구조이다. 그리고 본 논문에서 제한한 혼합기는 트렌지스터의 기생 캐패시터를 동조 기법인 Gilbert-Cell 구조를 이용하여 설계하였다. 저잡음 증폭기의 결과는 잡음지수가 1.26㏈로써 제안한 1.88㏈보다 향상되었고, 믹서 역시 100㎑에서 9.8㏈로 잡음 지수가 향상되었다.

빈용 한약재의 진통 소염활성

박종은,최혁재,정석희,김동현,김남재,Park, Jong-Eun,Choi, Hyuk-Jae,Jung, Suk-Hee,Kim, Dong-Hyun,Kim, Nam-Jae 한국생약학회 2001 생약학회지 Vol.32 No.4

Analgesic and antiinflammatory activities of several herbal medicines were investigated in order to develop the antiinflammatory drugs from oriental herbal medicines. 80% Ethanol extracts of Ephedra sinica, Chaenoleles sinensis, Asiasarum siboldi, Nelumbo nucifera, Scolopendra subspinipes mutians, Evodia officinalis, Aremarrhenae asphodeloides, Bufo bufo gargarizans, Gardenia jasminoides, Piper longum, Carthamus tinctorius, Piperus nigrum, Magnolia officinalis and Siegesbeckia glabrescens showed significant inhibitory effects on hyaluronidase, trypsin, and albumin denaturation in vitro. They also decreased the acetic acid-induced pain and vascular permeability induced by histamine in mice.