정창권 박사의 시스템사고 블로그

  Andrew Ford 헌정 강의: 『Modeling the Environment』 목차 훑어보기 안녕하세요. 오는 2월 12일(수) 부터 Andrew Ford(이하 Andy) 헌정 강의 를 진행하게 되어 소식을 전합니다. Andy는 시스템다이내믹스(SD) 세계에서 큰 족적을 남긴 분으로, 학회에서 잠시 뵙고 사진 한 장만 찍은 인연이 전부였지만, 모든 사람이 존경할 만큼 따뜻하고 인자한 태도 에 저도 모르게 빠져들었습니다. 안타깝게도 2025년 직전에 작고 하셨는데, 그분의 업적과 성품을 기리는 마음으로 이번 강의를 준비하게 되었어요. 시스템다이내믹스 에 관심 있는 분이라면 절대 놓치지 마십시오. 저는 Andy의 역작 『Modeling the Environment』를 제 시각으로 해설해 보겠습니다.  오늘은 강의를 시작하기 전에, 이 책의 목차 를 먼저 살펴보면서 전체 흐름을 간단히 정리해 보려 합니다. Part I. Introductory Modeling (기초) 1장에서 12장까지는 말 그대로 기초 모델링에 해당합니다. 저량(Stock) 과 유량(Flow) , 즉 저량-유량 지도(Stock & Flow Diagram, SFD) 가 핵심 개념으로 등장하고, 인과순환지도(Causal Loop Diagram, CLD) 를 통해 시스템사고(systems thinking) 의 기본 구조(피드백 루프, 시간 지연, 균형 다이어그램 등)를 다룹니다. S-자형 성장, 감염병(전염병) 모델, Daisyworld 등 구체적인 예제가 풍부해, “이론을 실제 문제에 어떻게 적용하는지” 직관적으로 파악할 수 있습니다. 특히 2장에서는 Stella , Vensim 같은 시스템다이내믹스 소프트웨어를 다루는 방법을 구체적으로 알려 주는데, 초심자에게 정말 큰 도움이 됩니다. 직접 저량-유량 지도 를 그려 보고 시뮬레이션 결과를 실행해 보는 과정을 실습하듯이 따라갈 수 있기 때문이죠. Part II. Intermediate Modeling (중급) 13장...

The phrase "you, like methane" could also be used to describe a person. This is because of the properties of methane. The melting point of methane is minus 183 degrees Celsius, and the boiling point is minus 162 degrees Celsius. Therefore, if it is not frozen solid in the ice, it can be considered in a gaseous state. Thus, we can say that a person like methane is always ready to float around. Methane (CH4) is formed by the combination of four hydrogen (H) atoms and one carbon (C) atom. Carbon dioxide (CO2) can also be called tetrahydrocarbon, as it is formed by the combination of two oxygen (O) atoms and one carbon atom (C). However, the combination of carbon and hydrogen is interesting. The combined strength of carbon and hydrogen is so strong that it hardly reacts with acids, bases, metals, oxidants, and reducers. There is a principle that does not turn the rubber shoe upside down, so a person like methane will not lack a companion animal for life. However, in combustion re...

 - Focusing on Jeehee Paik’s “Flow” exhibition Experience the ever-changing and free essence of "Flow" through the exquisite works of Jeehee Paik.  As the sound of "All Blues" by Miles Davis fills your ears, let the rhythm guide you to the exhibition where you'll discover the captivating philosophy of System Dynamics. Immerse yourself in the beauty of "Flow". Flow exists in the behavior of water, the babbling stream, or the powerful waterfall. To contain the flow, we need stock. Stock represents what is being accumulated or depleted, such as the sea or a fish holder.  System Dynamics is a study that focuses on the interaction between flow and stock, and how they influence each other. In System Dynamics, we are interested in uncovering the secrets of flow and stock. Flow is invisible because it is unstoppable, but it can be seen as stock. The stock has no power on its own, it's only what flows in and out that determines its existence. If we want to ...

A desert oasis is not just a place of rest for weary travelers and merchants; it is a sanctuary for the soul. But the oasis I explored today was different. As I stepped onto the wooden path, I felt as though I was entering a world shrouded in mystery, a place untouched by the outside world for thousands of years. The clothes worn by the people there were unlike any I had ever seen before. They were influenced by the rich and vibrant culture of Islam, a culture that was perfectly suited to the harsh desert climate. In one corner of the oasis, a long, curved sword stood tall and proud. It was not a weapon of threat, but a symbol of appreciation for the beauty of life. The people there valued peace above all else, which is why they shook hands with their right hand, the same hand that held the knife. As I looked around, I saw a group of men and women lying sideways in the shade of a white awning. They were sipping Red Fruit Punch and chatting softly, their voices blending seamlessly with ...