부동산투자에 대한 크라우드펀딩의 동향과 과제

정광식(Jeong, Kwangsik),민성훈(Min, Seonghun) 도시정책학회 2017 도시정책학회 학술대회 Vol.2017 No.3

This study is about real-estate crowdfunding what recently becomes a magnet for both investors and the company in need of funding support. In terms of a life cycle of company, it could be classified with a few stages from its beginning to extinction. It is surprise to know that less than 15 percent of the company could move on to the growth phase within 3 years. What is the reason that 85 percent of the company go broke? For those reasons, despite its short existence, Crowdfunding has been issued in domestic and abroad in comparison with existing financial system in Korea. This research aims to study quality of crowdfunding, and seek applicability and look for improvement point when crowdfunding a Lending and crowdfunding a Equity applying for real estate, and the consequential research on consumer protection.

Web 기반 가상공작기계의 구현

정광식(Jeong, K. S.),서석환(Suh, S. H.),서윤호(Seo, Y. H.),이현수(Lee, H. S.) (사)한국CDE학회 2001 한국CDE학회 논문집 Vol.6 No.4

칼코지나이드 기반 위상절연체를 이용한 광전소재 연구 동향

정광식,정권범,Jeong, Gwang-Sik,Jeong, Gwon-Beom 한국전기전자재료학회 2021 전기전자재료 Vol.34 No.3

스마트폰 앱을 이용한 산업용 엔진의 모니터링 시스템 개발에 관한 연구

정찬세(C. S. Jeong),김용석(Y. S. Kim),정영만(Y. M. Jeong),고주현(J. H. Kho),정광식(K. S. Jeong),이효성(H. S. Lee),양순용(S. Y. Yang) 유공압건설기계학회 2013 드라이브·컨트롤 Vol.10 No.2

In this study, a wire/wireless communication system transmitting the operation data of engine from the ER (Engine Room) to the engine controller of ECR(Engine Control Room) has been developed through the communication of ISM(Industrial Science Medical) Band for the test operation environment improvement of medium speed engine. This wire/wireless communication system is composed of the RTU (Remote Terminal Unit) gathering and transmitting engine data as well as the MCU (Master Control Unit) receiving engine status information from the RTU to be sent to the engine controller (PLC). Through this study, a trial product of RTU and MCU has been manufactured. A test bench that has made temperature, pressure and pick-up sensor into a module for the local test of prototype was produced a test bench. In addition, at the same time save the data to a Web server and the smart phone real-time monitoring system has been developed using Wi-Fi communications. The ultimate objective of this study is to develop a wireless smart phone monitoring system of engine for the operator of engine to be able to monitor and control engine status even from the outside of engine room and control room based on this study.

속발성 간암으로 인한 협통(脇痛) 치험(治驗) 1례(例)

정광식,감철우,박동일,전종철,Jeong, Gwang-Sik,Gam, Chul-Woo,Park, Dong-Il,Jeon, Jong-Chul 대한한방내과학회 2001 大韓韓方內科學會誌 Vol.22 No.4

This study was performed on the basis of clinical consideration about patient who has hepatocholangiocarcinoma, and pancreatic cancer. Cancer has gradually increased morbidity and mortality all over the world including Korea. Western medicine has treated with surgical therapy, chemotherapy, radiotherapy and immunotherapy, but has not obtained outstanding results and has a difficulty due to side effects by those therapies. In this study, we recognized that symptom including hypochondriac pain by cancer are rapidly decreased with herbal medication treatment and acupuncture therapy. Oriental medicine treatment is applied throughly on the basis of the oriental medicine principle and the prescriptions were used Naeso-oksultang(內消沃雪湯). According to the above results, we can know this patient has improvement of patient's symptom on administration of oriental medicine treatment, it is helpful in decresing symptoms of patient and in improving quality of life.

단위부재의 Mock-up Test를 통한 접합분리 시험체의 압축강도 평가

정광식(Jung Kwang-Sik),기전도(Ki Jun-Do),김광기(Kim Kwang-Ki),김정진(Kim Jeong-Jin),이영도(Lee Young-Do),정상진(Jung Sang-Jin) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.5

Existing non-destructive test for evaluation of concrete compressive strength may show deviation in results analysis due to deterioration of precision by strength calibration and dry or humid condition by age, so there needs be testing method to determine long term structural internal force by collecting specimen with no damage of structure and measuring compressive strength through destruction test. This research applied to mock-up member the compressive strength evaluation method using joint separation mold that can plan and produce specimen cured in the same composition environment as concrete structure by attaching arbitrary(joint separation) to the form before concrete piling, and as a result, the management specimen was contrary to the hydration temperature of the member or was affected by external atmospheric temperature, however the joint separation specimen connected to structure and managed in the same environment showed a temperature curve similar to the member and decrease in temperature difference. Additionally, from initial age, with the compressive strength of joint separation specimen most similar to core strength, stable compressive strength can be evaluated up to design criteria strength 100㎫, so the method is proposed as an evaluation technique that can confirm highly reliable concrete quality.

부정맥(不整脈)에 대(對)한 동서의학적(東西醫學的) 문헌고찰(文獻考察)

정광식,김영균,권정남,김경민,Jeong, Gwang-Sik,Kim, Young-Guen,Kwon, Jung-Nam,Kim, Kyoung-Min 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.5

through a literal study upon Arrhythmia between east and west medicine, the results were as follows 1. Arrhythmia is not only irregular cardiac beat but disorder of cardiac impulse making and conduction disturbance. it means almost irregularity of interval between two beat 2. In the east medicine, arrhythmia is represented various category as palpitation, continuous palpitation, dizziness, consumption which give the first consideration by the accompanied symptoms. A separate way in a diagnostics it become a base of diagnosis of diseases and decision of prognosis by the examination of pulse 3. In the west medicine, Arrhythmia is classified as disorder of heart rate, rhythm, conduction disturbance or tachycardia, bradycardia and it is concomitant with fatigue, palpitation, dyspnoea, syncope, chest discomfort 4. The diagnostic study of pulse condition which represent arrhythmia was started from $\mathbb{<}$Nae-Kyung$\mathbb{>}$ and it was revealed as pulse condition of rapid pulse, slow pulse, swift pulse, running pulse, knotted pulse, intermittent pulse etc. Out of them running pulse, knotted pulse, intermittent pulse which obviously are concomitant with irregularity of interval are clinically meaningful in a conditions of disease and decision of prognosis. and the significance of these pulse condition are transformed through the changes of the times 5. According to cause of disease it is classified by Arrhythmia(running pulse, knotted pulse, intermittent pulse) due to heat, cold, phlegm, deficiency(or insufficiency) and There are three categories of etiological factor that is, endogenous, exogenous and non-exo-endogenous factor. the endogenous factor is insufficiency of the heart Ki, deficiency of both Ki and blood, intemal stagnation of phlegm and fluid, stagnation of seven emotions. the exogenous factor is caused by stagnation of Ki and blood by six exogenous pathogenic factor and the non-exo-endgenous factors are improper diet, overstrain, traumatic injury. A cause of arrhythmia in western medicine are a organic and pathological change of the heart itself and malfunction of the autonomic nervous system.

자기 흡인식 부상 원리에 기초한 비접촉식 서피스 액추에이터의 초정밀 범용 스테이지에의 적용 가능성

정광식,이상헌,백윤수,Jeong, Gwang-Sik,Lee, Sang-Heon,Baek, Yun-Su 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.3

The precision stage using a novel contact-free planar actuator based on magnetic farces, magnetized force and Lorentz farce, is suggested. In the promising magnetic structure, the mover is driven directly without any transmission mechanism, and doesn't need any auxiliary driver for its posture calibration. Then it is estimated that the proposed operating principle is very suitable for work requiring high accuracy and cleanness, or general-purpose nano-stage. In this paper, we discuss a driving principle of the planar system including the magnetic force generation mechanism, a framework for the force model, governing characteristics of the levitated plate, and a planar motion control of the constructed prototype. And experimental results are given to verify the derived theoretical model and a feasibility of the system.

인과적 메시지 로깅 기법에서 부가적 메시지 교환 없는 메시지 로그 쓰레기 처리 기법

정광식,유헌창,백맹순,손진곤,황종선,Jeong, Gwang-Sik,Yu, Heon-Chang,Baek, Maeng-Sun,Son, Jin-Gon,Hwang, Jong-Seon 한국정보과학회 2001 정보과학회논문지 : 시스템 및 이론 Vol.28 No.7

이 논문은 인과적 메시지 로깅 기법에서 결함 포용을 목적으로 안전 저장 장치(stable storage)에 저장되는 메시지 내용 로그와 메시지 순서 로그의 쓰레기 처리 기법을 제안한다. 기존의 인과적 메시지 로깅을 기반으로 한 메시지 로그 쓰레기 처리 기법은 메시지 순서 로그의 쓰레기만을 처리하였다. 메시지 내용 로그는 불필요한 복귀를 피하기 위해 유지해야 하며, 메시지내용 로그의 쓰레기 처리를 위해서는 부가적인 메시지를 필요로 하였다. 이 논문은 인과적 메시지 로깅 기법에서 메시지 내용 로그와 메시지 순서 로그가 쓰레기 처리되어지기 위해 필요한 조건을 새롭게 정의하며, 이 정의를 기반으로 한 메시지 내용 로그와 메시지 순서 로그의 쓰레기 처리 알고리즘을 제안한다. 제시된 조건을 기반으로 한 메시지 내용 로그와 메시지 순서 로그의 쓰레기 처리는 송수신 메시지에 부가된 MAG(Modified Antecednce Graph)를 이용하므로 쓰레기 처리를 위한 부가적인 메시지를 발생시키지 않는다. 하지만 제안된 기법은 일반 메시지가 송수신되기 전까지 쓰레기 처리가 지연되는 '지연 쓰레기 처리 현상(lazy garbage collection)'을 발생시킨다. 하지만 '지연 쓰레기 처리 현상'은 분산 시스템의 일관성을 위배하지 않으며, 쓰레기 처리를 위한 부가적인 메시지 교환을 필요로 하지 않는다.

이동 호스트의 병렬적 위치 정보 탐색을 위한 서버의 계층 구조

정광식,유헌창,황종선,Jeong, Gwang-Sik,Yu, Heon-Chang,Hwang, Jong-Seon 한국정보과학회 2001 정보과학회논문지 : 시스템 및 이론 Vol.28 No.1

The development in the mobile computing systems have arisen new and previously unforeseen problems, such as problems in information management of mobile host, disconnection of mobile host and low bandwidths of wireless communications. Especially, location information management strategy of mobile host results in an increased overhead in mobile computing systems. Due to the mobility of the mobiles host, the changes in the mobile host's address depends on the mobile host's location, and is maintained by mapping physical address on virtual address, Since previously suggested several strategies for mapping method between physical address and virtual address did not tackle the increase of mobile host and distribution of location information, it was not able to support the scalability in mobile computing systems. Thus, to distribute the location inrormation, we propose an advanced n-depth LiST (Location information Search Tree) and the parallel location search and update strategy based on the advanced n-depth LiST. The advanced n-depth LiST is logically a hierarchical structure that clusters the location information server by ring structure and reduces the location information search and update cost by parallel seatch and updated method. The experiment shows that even though the distance of two MHs that communicate with each other is large, due to the strnctural distribution of location information, advanced n-depth LiST results in good performance. Moreover, despite the reduction in the location information search cost, there was no increase in the location information update cost. A Hierarchical Server Structure for Parallel Location Information Search of Mobile Hosts이동 컴퓨팅 환경의 발전은 기존의 분산 시스템에서는 볼 수 없었던 이동 호스트의 위치 정보 관리 문제, 이동 호스트의 접속 단절 문제, 낮은 무선 통신 대역폭의 문제 등 과 같은 새로운 문제점을 발생시켰다. 특히 이동 호스트의 위치 정보 관리 기법은 이동 컴퓨팅 환경의 성능을 저하시킨다. 이동 호스트의 이동성으로 인해 이동 호스트의 주소가 이동 호스트의 위치에 종속적으로 변화하며, 이동 호스트의 주소는 고유 주소와 현재 주소의 사상을 통해 관리된다. 이동 호스트의 고유 주소와 현재 주소를 사상시켜 주기 위한 이전의 기법들은 이동 호스트의 증가 및 위치 정보의 분산관리를 고려하지 않았기 때문에 시스템의 확장성에 큰 문제를 가지고 있다. 이 논문에서는 이동 호스트의 주소를 분산 관리하기 위해 개선된 n-깊이 위치 정보 탐색 트리와 개선된 n-깊이 위치 정보 탐색 트리를 기반으로 한 병렬적 위치 정보 탐색과 갱신 기법을 제안한다. 개선된 n-깊이 위치 정보 탐색 트리는 링 구조를 이용하여 위치 정보 서버를 지역적으로 분할한 위치 정보 서버의 논리적 계층 구조이며, 병렬적 탐색 기법을 기반으로 이동 호스트의 위치 탐색 비용과 갱신 비용을 줄였다. 개선된 n-깊이 위치 정보 탐색 트리를 기반으로 한 위치 정보 탐색/갱신 기법은 위치 정보 서버의 논리적 위치가 멀리 떨어져 있는 경우에도 병렬적 탐색 기법을 통해 기존의 방법보다 좋은 결과를 보인다. 또한, 탐색비용의 감소에도 불구하고 갱신 비용의 증가를 가져오지 않는다.